KR20150119798A - Method and apparatus for providing service using radio resource aggregation - Google Patents

Abstract

Provided are a method for setting connection of a base station, a node, and a terminal, a method for scheduling a wireless resource of a non-permitted band, and a protocol stack about data transmission through a wireless resource of a non-permitted band, so a terminal can be provided with a service by using a wireless resource of a permitted band and a wireless resource in a non-permitted band.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio resource aggregation

The present invention relates to a method and apparatus for providing a service using radio resources of an authorized band and radio resources of an unlicensed band.

The cellular mobile communication system has a bandwidth scalability feature that supports various system bandwidths and can improve a data rate by using a carrier aggregation (CA) technique. In a wireless local area network (WLAN) system using a frequency of an unlicensed band (for example, an industrial, scientific, medical (ISM) frequency, Or a multiple input multiple output (MIMO) technique using multiple antennas. In WLAN systems, there is a need to improve the quality of service in the border area or user congestion area of the AP because the method for mitigating the access point (AP) or inter-user interference is not efficient.

Typically, unlicensed frequency bands have restrictions on the maximum output or frequency spreading factor to reduce inter-user interference. In addition, the user is provided with communication service using the type approved communication equipment (for example, WiFi (Wireless Fidelity) or WLAN system). The unlicensed frequency band is set to 900 MHz, 2.4 GHz, 5.7 GHz band and the like in the world, and the Bluetooth standard or the WLAN radio communication standard method of IEEE 802.11 operates in the unlicensed frequency band. Currently, the amount of data transmission in a wireless communication system including a mobile communication system is rapidly increasing. Various researches are underway to accommodate a data transmission demand in a mobile communication system and a WLAN system.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for providing a service to a terminal using radio resources of an unlicensed band together with radio resources of an authorized band so as to accommodate a data transmission request amount.

According to one embodiment of the present invention, a method of providing a service of a base station is provided. The method includes receiving a measurement result of at least one node located in the vicinity of a terminal from a terminal, performing a radio resource aggregation of a first node and a base station of at least one node based on measurement results, And providing a service to the terminal via the first node.

The service providing method may further include transmitting and receiving control information to and from the first node, and transmitting information of the first node to the terminal.

The step provided by the service providing method may include, when off-loading is supported, transmitting all the packet data of the service through the first node to the terminal.

In the service providing method, when a carrier aggregation (CA) is supported, at least one first carrier allocated to the base station and at least one second carrier allocated to the first node are aggregated, And transmitting the packet data to the terminal.

Wherein the step of providing the service provides at least one first radio resource allocated to the base station and at least one second radio resource allocated to the first node when radio resource aggregation (RRA) is supported, And transmitting the packet data of the service to the terminal.

In the service providing method, the first node may be a node of a mobile communication network using an unlicensed frequency band.

According to another embodiment of the present invention, a method for receiving a service of a device of a mobile communication network using an unlicensed frequency band is provided. The method of receiving a service includes the steps of: searching for a presence of another wireless device using a contention-based region in a contention-based region included in a wireless frame of the mobile communication network; And receiving the service from the base station of the mobile communication network or the node of the mobile communication network using the unlicensed frequency band using the first radio resource if possible.

The service receiving method includes receiving a second radio resource in a contention-free area included in a radio frame through scheduling of a base station, and receiving a service using a first radio resource or a second radio resource .

In the service receiving method, the contention-based domain and the contention-based domain may occupy different portions in the time domain of the radio frame.

In the service receiving method, the contention-based domain and the contention-based domain may occupy different parts in the frequency domain of the radio frame.

Wherein the contention-based region and the contention-free based region each include at least one subframe, the number of at least one subframe included in the contention-based region, and the number of at least one subframe included in the contention- Each wireless frame may be different.

Wherein the contention-based domain and the contention-based domain each include at least one subcarrier, and the number of at least one subcarrier included in the contention-based domain and the number of at least one subcarrier included in the contention- May be different for each radio frame.

In the service receiving method, the contention-based area and the contention-free based area are divided into at least one physical layer control (MAC) layer and a non-contention-based area in which a radio resource unit, a radio resource configuration scheme, a modulation and coding scheme Channels, and the number of at least one physical layer control channel included in the contention-based area and the number of at least one physical layer control channel included in the contention-free area may be different for each radio frame.

The searching in the service receiving method may include sensing whether another wireless device exists in the vicinity before requesting a radio resource to a node of the base station or the mobile communication network.

The searching in the service receiving method may include a step of measuring energy of a signal of a radio resource to which the system information is transmitted and searching for the presence of another wireless apparatus using the contention-based area.

According to another embodiment of the present invention, there is provided a transmitting apparatus for transmitting packet data using radio resources of a mobile communication network and radio resources of a wireless local area network. Wherein the transmitting apparatus determines a transmission path of packet data as one of a first transmission path of the mobile communication network, a second transmission path of the wireless local area network, or a third transmission path of the mobile communication network using the frequency of the unlicensed band, And a control unit for delivering the packet data to one of the first transmission path, the second transmission path, or the third transmission path based on the determination of the scheduler.

The transmitting apparatus includes a convergence function block for interfacing a packet data convergence protocol (PDCP) layer based on a mobile communication network and a media access control (MAC) layer of a wireless local area network .

The convergence functional block in the transmitting apparatus can convert a packet data unit (PDU) of the PDCP layer according to a service data unit (SDU) of the MAC layer.

In the transmitting apparatus, the control unit may serve as a packet data convergence protocol (PDCP) layer of the mobile communication network.

In the transmitting apparatus, the controller may serve as a radio link control (RLC) layer of the mobile communication network.

According to an embodiment of the present invention, a terminal may be connected to a base station that uses radio resources of an authorized band and a node that uses radio resources of an unlicensed band, and may receive a service based on a scheduling and a protocol structure through radio resource aggregation .

1 is a diagram illustrating a hierarchical wireless network according to an embodiment of the present invention.
2 is a diagram illustrating a wireless network connected to a wired or wireless backhaul according to an embodiment of the present invention.
3 is a flowchart illustrating a radio resource collection method according to an embodiment of the present invention.
4 is a flowchart illustrating a radio resource collection method according to another embodiment of the present invention.
5A through 5E are diagrams illustrating a radio frame of a U-LTE system according to an embodiment of the present invention.
6 is a diagram illustrating a radio frame of a U-LTE system according to another embodiment of the present invention.
7 is a diagram illustrating a wireless network according to another embodiment of the present invention.
8 is a diagram illustrating a protocol stack of a U-LTE system according to an embodiment of the present invention.
9 is a diagram illustrating a protocol stack of a U-LTE system according to another embodiment of the present invention.
10 is a block diagram illustrating a wireless communication system according to another embodiment of the present invention.

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

Throughout the specification, a mobile station (MS) is referred to as a terminal, a mobile terminal (MT), an advanced mobile station (AMS), a high reliability mobile station (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR) A femto BS, a home Node B, a HNB, a pico BS, a metro BS, a micro BS, ), Etc., and may be all or part of an ABS, a Node B, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, an RS, an RN, an ARS, It may include a negative feature.

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

Referring to FIG. 1, each node included in a hierarchical wireless network is a node providing a service using a mobile communication service or an unlicensed band frequency. That is, referring to FIG. 1, in a hierarchical wireless network, a plurality of base stations (or cells) and APs (or transmission points, TP) are components of a hierarchical environment. A base station may cover a macro layer having a large service area, and a small base station or an AP may be a micro layer having a relatively small service area.

Mobile communication and wireless communication services may be provided in heterogeneous frequency bands over the hierarchical wireless network shown in FIG.

In a wireless network providing a service using a frequency of an unlicensed band, an end node (hereinafter, referred to as 'network node') of the network may be configured as a base station in a mobile communication system or an AP type of a WLAN system. In particular, in a new Radio Access standard for radio interface between a node (e.g., a base station, a cell, a radio remote head (RRH), a TP, or an AP, etc.) A wireless standard of 3GPP (3 ^rd Generation Partnership Project) system or LTE-A (Long Term Evolution-Advanced) system can be applied. In an embodiment of the present invention, a node using a frequency of unlicensed band by applying a new radio access standard based on a radio standard of an LTE or LTE-A system is referred to as a new AP. The new AP may be configured as an AP of the existing WLAN system or may be configured as a base station, cell, RRH, TP, etc. of the mobile communication system. Accordingly, the new AP can support the new wireless access standard through the frequency of the unlicensed band. The new AP transmits beacon or advertisement information transmitted from the existing WLAN AP or transmits system information in a manner similar to that of the base station of the mobile communication system to transmit information common to the terminals in the service area of the new AP information.

1, the frequency f ₁ of the macro base station and the frequency f ₂ of the small base station may be the same or different. The micro base station's small base station can be deployed in an environment where the macro base station is present or can independently provide service outside the area of the macro base station. Also, the small base stations 121 and 122 may be disposed in areas other than the service areas of the macro base stations to extend the service areas of the macro base stations or to provide service continuity to the coverage holes.

With a macro base station and a small base station, the network can be connected to an ideal backhaul or a non-ideal backhaul. The ideal backhaul connects the base station and the network point-to-point through a dedicated line, such as an optical cable or a line of sight (LOS) microwave, which provides high transmission rate and low latency characteristics. . A limited backhaul is a typical backhaul composed of a wired network with transmission performance limitations and delays, and has a limited transmission rate and some delay characteristics.

An AP providing a service using a frequency of an unlicensed band according to an embodiment of the present invention may be placed in a service area of a macro base station or a small base station. In accordance with one embodiment of the present invention, both existing WLAN-based APs and new APs (not based on WLAN-based wireless specifications) can provide services in a hierarchical wireless network. The existing AP based on the WLAN or the new AP based on the new wireless protocol can be disposed and operated in the same position as the macro base stations 111 and 112. The AP and the new AP can be operated together with the mobile communication base station, the delay in the signaling between the base station and the AP can be minimized, and the signaling interface can be further simplified.

The new AP in the unlicensed frequency band supporting the new wireless access standard according to an embodiment of the present invention can transmit beacon or advertisement information transmitted from the AP of the existing WLAN system. Also, the new AP transmits system information that can transmit a common control message (or parameter) in a manner similar to that of the base station in the mobile communication system, thereby transmitting common information to a terminal located in the service area of the new AP, . At this time, the common information includes an identifier (ID) of a new AP, system bandwidth and minimum bandwidth information, physical channel configuration information, uplink access channel information, Information on whether radio resource aggregation (RRA) function of inter Radio Access Technology (Inter-RAT) between radio access technologies is supported, information on whether or not off-loading function is supported, and the like.

The RRA function is a function that two or more network nodes (base station, cell, AP, etc.) use wireless resources together to provide services to one terminal. This heterogeneous radio resource aggregation technology is also referred to as Inter-RAT CA (carrier aggregation). According to the RRA function, at least two nodes conforming to different radio standards can provide services to the same terminal using frequency (or subcarrier) of each radio standard. If the RRA function is supported, both licensed and unlicensed frequencies may be used. In one embodiment of the present invention, the radio resource aggregation (RRA) function is used in a wireless communication system (such as a mobile communication system such as WCDMA, LTE, and LTE-A systems) using an authorized band frequency and wireless communication (WLAN, U-LTE system, etc.) together to provide services.

The new AP provides a service to the terminal using the frequency of the unlicensed band, but it does not perform the connection establishment control procedure, the radio resource allocation and resource management procedure, the mobility control procedure, the measurement and reporting procedure, Or the AP), the operations and procedures of the mobile communication base station using the frequency of the authorized band may be applied. For example, if a new AP uses an unlicensed frequency band and the wireless protocol between the new AP and the terminal is based on the wireless protocol of the 3GPP LTE system, the new AP provides services to the terminal at the same level as the base station of the LTE system . In particular, when a LTE base station provides a primary cell (Pcell) through a CA function of the LTE-A system and a new AP provides a secondary cell (SCell) It can operate without any functional difference from SCell.

 2 is a diagram illustrating a wireless network connected to a wired or wireless backhaul according to an embodiment of the present invention.

A backhaul refers to an interface section that connects a base station (or an AP) and a gateway (or router). Therefore, the wireless interface connecting the base station and the gateway can be referred to as a wireless backhaul. Meanwhile, the base station includes a digital processing unit (DU) for performing digital signal processing such as baseband processing, and an analog signal processing unit for performing analog signal processing such as radio frequency (RF) And a radio and analog processing unit (RU). If DU and RU are physically spaced, the interface section connecting DU and RU can be called front-haul. Or an RRH installed in a geographically different position with respect to a base station, which is configured mainly for an RF function including an antenna for extending a service area or covering a shadow area, and an interface section for connecting the base station may be defined as a front hole. In the case where the connection of such a front hall section is configured wirelessly, this can be referred to as a wireless front hall. In an embodiment of the present invention, when the interface between a base station, a gateway, and a geographically remote base station function block is configured wirelessly, both the wireless front hole and the wireless backhaul are collectively referred to as a wireless backhaul.

The new AP according to an embodiment of the present invention can configure a wireless communication network with a new wireless access standard using the frequency of the unlicensed band. The macro base stations 211 and 212 of the mobile communication system can provide a mobile communication service to the terminals 261, 262 and 263 by maintaining an interface with the gateway 250. The small base station 221 in which the interface with the gateway 250 is formed directly and the small base stations 222 and 223 in which the interface with the gateway 250 is formed indirectly through the macro base station can also provide the mobile communication service to the terminal.

In the service area of the macro base station 211, at least one small base station 221, 222, 223 may exist, and a WLAN-based WLAN AP 231, 232, 233, 234 may exist. In another macro base station 212, there may be a small base station cluster 220 in which a plurality of small base stations provide services together. The WLAN AP 234 and the new AP 241 may exist in the service area of the small base station 221 located in the service boundary region of the macro base station 211 and the other macro base stations 212. Meanwhile, according to the embodiment of the present invention, the building 270 is provided with a new AP 243 for providing a new wireless access standard, and a wireless network in which a small base station 224 and a WLAN AP 233 are present together .

The macro base stations 211 and 212 and the small base stations 221 and 222 and 223 and 224 or the macro base stations 211 and 212 and the small base station cluster 220 are directly connected to each other through a wired cable (optical cable, coaxial cable, Or may be indirectly connected through the gateway 250. The small base station 223, the WLAN AP 231 and the new AP 242 may be wirelessly connected to the macro base stations 211 and 212. At this time, the small base station 223, the WLAN AP 231 and the new AP 242 may be connected to the gateway 250 through a wired connection between the macro base stations 211 and 212 and the gateway 250. Typically, a backhaul refers to a connection between a base station and a gateway, but according to one embodiment of the present invention, a wireless connection between a small base station, a WLAN AP or a new AP and a macro base station may be referred to as a wireless backhaul.

According to an embodiment of the present invention, a new wireless access standard through the frequency of the unlicensed band can be applied to the wireless backhaul between the macro base station, the small base station, the WLAN AP and the new AP. The small base stations 220 to 224 included in the service areas of the macro base stations 211 and 212 may use the same frequency or different frequencies as those of the macro base stations 211 and 212. In addition, in one embodiment of the present invention, the frequency (or system bandwidth) at which the new AP 242 provides services to the terminals 261-262 is determined by the frequency at which the new AP 242 uses the frequency May be the same or different.

The feature of off-loading data of a mobile communication network into a WLAN system is important in a hierarchical wireless network. However, since the WLAN system and the mobile communication system have different access methods, scheduling methods and radio resource structures, it is difficult to secure service continuity through tightly coupled between the two systems. At this time, if some functions are provided from the viewpoint of the radio access network (RAN), interworking of the WLAN system and the mobile communication system can be efficiently provided. For example, there is a method of improving the WLAN AP search procedure of the terminal or transmitting information on the service attribute.

A terminal supporting both the WLAN system and the mobile communication system may consume a large amount of battery power if the restriction on the search for the WLAN AP is not set. Therefore, the terminal usually searches for the AP only when the user activates the WiFi function. Alternatively, even when the WiFi function is activated, the mobile station can periodically search for APs according to a timer set separately, or search for APs based on AP information or stored information provided in the mobile communication system.

3 is a flowchart illustrating a radio resource collection method according to an embodiment of the present invention.

Referring to FIG. 3, an AP may be one of an AP of a WLAN system, a small base station of a mobile communication system, a RRH, a TP, or a new AP using a frequency of an unlicensed band. At this time, the new AP can support the new wireless access standard through the frequency of the unlicensed band.

Referring to FIG. 3, the base station transmits control signaling to the AP to exchange information for off-loading, AP search, measurement, and the like, or to collect information.

First, the base station transmits system information to the terminal (S301). At this time, the base station transmits AP information (for example, a service set identifier (SSID), WLAN frequency band information, location information, synchronization information or discovery information, etc.) (E.g., AP measurement threshold value, measurement cycle timer information, etc.) to the terminal together with the system information. At this time, the base station can transmit the connectable AP information and the AP measurement related information to the terminal supporting the WLAN through a separate dedicated control message.

The AP information according to an exemplary embodiment of the present invention may be in the form of a list and may include identifier information of a connectable AP, frequency band and system bandwidth of the AP, and geographical location information of the AP. In the case of a WLAN AP, the identifier information of the AP may be an SSID, a basic service set identifier (BSSID), or a homogeneous extended service set identifier (HESSID) . In the case of a new AP, an identifier of an existing WLAN AP may be used, or an identifier (e.g., a physical cell identifier (PCI), a cell global identifier , CGI), or an enhanced UMTS Terrestrial Radio Access Network (e-UTRAN cell global identifier, ECGI), etc., or a new type of identifier for distinguishing a new AP may be used. The frequency band and the system bandwidth information of the AP according to the embodiment of the present invention may include information indicating the transmission frequency of the AP in the list, the system bandwidth supported by the AP in the list, And the like. The geographical location information of the AP according to an exemplary embodiment of the present invention may include location information for a location based service (LBS) of the mobile station or location information for estimating the location of the mobile station.

The AP measurement related information according to an exemplary embodiment of the present invention is a reference condition that can be used for determining whether the AP is switched or not for receiving a service using the CA or RRA function from the AP or off- triggering condition, which may include a threshold for the AP receive power. For example, a base station according to an exemplary embodiment of the present invention may use a received signal strength indicator (RSSI), a signal to interference ratio (SIR), a bit energy ratio a received signal power indicator (RCPI), a received signal to noise indicator (RSNI), a reference signal received quality , RSRQ, RSRP, RSCP, and the like to the UE through the system information as AP measurement related information. If necessary, the terminal measures the received signal power for the AP included in the measurement and reporting parameters set by the base station with respect to the AP in the AP list of the system information, or the base station transmits the measurement result of the received signal power to the base station .

In addition, the base station according to an embodiment of the present invention can transmit synchronization signal information about the synchronization signal for the AP or the synchronization signal for setting the synchronization with the AP using the system information transmitted to the terminal. In addition, the base station may transmit search signal information on a search signal for discovery of an adjacent base station or an AP performing an on / off operation for energy saving to the mobile station. At this time, the synchronization signal information or the search signal information may include a signal transmission period, a transmission position (subframe or subcarrier information to which a signal is transmitted), a repetition period of a signal, or scrambling (or masking) sequence information. The base station according to an embodiment of the present invention can transmit synchronization signal information or search signal information to a terminal supporting WLAN using a dedicated control message.

Next, the terminal receiving the system information from the base station performs measurement on the AP located nearby using the AP information included in the system information (S302). At this time, the terminal in the connected state receiving the service through the base station can perform the measurement on the neighbor AP or the base station according to the AP information acquired through the dedicated control signaling from the base station or the measurement and report setting of the base station .

A terminal according to an exemplary embodiment of the present invention may estimate or measure a synchronization signal or a search signal to support an on / off operation function of a base station or an AP. At this time, the terminal can measure a synchronization signal or a search signal in a background or autonomous manner. Thereafter, the UE can report the measurement result of the synchronization signal or the search signal to the base station or the AP using radio resources.

Next, the terminal that has performed the measurement for the neighboring AP reports the measurement result of the neighboring AP to the base station (S303). At this time, the UE can transmit a control message requesting off-loading to the AP or CA or RRA through the base station and the radio resource of the AP, together with the measurement result report, to the base station.

In the CA (or RRA) through the base station and the radio resources of the AP, the base station supports the primary base station function and the AP can support the secondary base station function. For example, the base station supporting the main base station function controls the signaling message exchange for the CA support, and the AP supporting the auxiliary base station function can take charge of data transmission / reception without the control function. That is, for CA support, the base station provides both a control plane function for signaling message transmission and a user plane function for data transmission, and the AP provides only a user plane function for data transmission .

Unlike the existing CA, especially in the RRA, the base station and the AP can provide both a control plane function for transmitting signaling messages to the UE and a user plane function for data transmission. However, for the transmission of effective signaling messages and the setting of control parameters, one of the base stations or the AP supports the master node function to perform the control plane function with priority and the other performs the control plane function from the viewpoint of the control plane ) Node. ≪ / RTI >

Meanwhile, the terminal can report the AP function information indicating whether the AP supports the AP to the BS, from the viewpoint of the capability of the UE, by reporting the measurement result of the neighboring AP or through a separate signaling message. For example, the terminal reports function information (e.g., AP standard version, available frequency band, etc.) of the AP supported by the terminal to the base station using the feature group indicator (FGI) information of the LTE system . The terminal may report the FGI information related to the AP function support to the base station when registering with the mobile network or during connection setup or establishment.

An AP according to an embodiment of the present invention broadcasts beacon or advertisement information so that terminals in a service area of the AP can receive it (S304). The AP of the WLAN system may broadcast beacon or advertisement information. The new AP can broadcast the common basic information of the new AP in the form of beacon or advertisement information of the WLAN AP or in the form of system information like the base station of the mobile communication system.

In another embodiment of the present invention, the terminal can perform measurement on the neighboring AP based on the beacon or advertisement information broadcast by the AP (S3O5). At this time, the terminal reports the measurement result of the neighbor AP to the base station and the AP, and can transmit a control message requesting off loading, CA, or RRA to the AP. That is, the UE reports the measurement result of the neighboring AP to the base station and all neighboring APs, and can transmit a control message requesting offloading, CA, or RRA. Alternatively, the terminal establishes a connection with the AP (for example, attempts to access the AP to allocate resources capable of receiving the service), reports the measurement results of the neighboring APs together with the connection establishment information and offloads the CA, And transmit the control message requesting the RRA to the base station and the AP. In this case, the base station and the AP, which have received the control message requesting offloading, CA, or RRA from the mobile station, may transmit a response message indicating whether the mobile station supports offloading, CA, or RRA function in step S306.

As described above, the base station and the AP can set separate interfaces for data offloading or RRA function support to the terminal, and exchange control messages through the set interface (S307). Control signaling between the base station and the AP may be performed before offloading, CA or RRA function support is started, or after the start of operation for offloading, CA or RRA function support.

Upon receiving the measurement result (and offloading, CA or RRA request) of the neighboring AP from the terminal, the base station determines whether the off-loading using the AP or the CA or RRA function is supported (S308).

In one embodiment of the present invention, the base station may determine whether to support data offloading, CA, or RRA functions using the AP through consultation with the terminal. For example, the base station transmits information requesting to report whether it supports data offloading, CA or RRA functions by transmitting a control message for confirming whether data offloading, CA or RRA function is supported to the terminal, Or to transmit information on whether data offloading, CA, or RRA function is supported when establishing a connection with a base station. Alternatively, the terminal can indicate whether data offloading, CA, or RRA functions are supported by using the capability information of the terminal (for example, FGI). At this time, the MS receiving the control message confirming whether the data offloading function or the CA or RRA function is supported can transmit a control message confirming the data off loading, CA or RRA function support to the BS, Whether to use offloading, CA, or RRA functionality can be determined. That is, the procedure for confirming whether the terminal supports data offloading, CA, or RRA function is a procedure for requesting data offloading, CA or RRA function to the dust base station or requesting service through the preset information By sending or receiving the relevant information in steps, or by the user's choice. The following information is displayed on the display of the terminal when the data offloading, CA or RRA function is determined according to the user's selection, and the user can perform data offloading, CA offloading, Or support of the RRA function.

- (Or confirmation) information of the base station confirming whether data offloading using the AP, CA, or RRA function is used

- Information indicating the AP around the terminal

Then, the base station negotiates with the AP to support offloading, CA and RRA functions, and exchanges necessary information to support off-loading, CA and RRA functions (S309).

Thereafter, the base station transmits a response message to the terminal whether it supports off-loading, CA or RRA function (S310). The base station can determine whether or not to support off-loading, CA or RRA functions according to the determination result of the neighbor AP measurement result of the terminal, information exchange between the base stations, information exchange with the AP, and network management / control functions. You can also decide to support offloading, CA, or RRA functionality.

When the base station determines to support the offloading function, the base station can provide the terminal with information about the target AP to which the mobile station will connect for data offload via the response message. Or when the base station determines to support the CA or RRA function, the base station transmits the information about the target AP to which the terminal will connect for the CA or RRA, the function sharing information between the base station and the AP for the CA or RRA, Information can be provided to the terminal through a response message. At this time, the information on the target AP transmitted to the mobile station by the base station may include identifier information of the target AP, information for a connection procedure connectable to the target AP in a contention-free manner, and radio resource allocation information for data transmission and reception. The UE does not perform carrier sensing (CS) or the like using the information on the target AP received from the base station, or does not compete with other WLAN devices included in the target AP area to perform collision-free CS , The service can be provided through the allocated frequency and time resources.

Then, the terminal having received the response message accesses the target AP and establishes a connection for receiving a service from the AP (S311). In an embodiment of the present invention, a terminal performs a random access (RA) procedure or an initial access procedure for a separately defined AP to allocate a resource capable of providing a service from the AP. In addition, the terminal establishes a connection with which the AP can transmit and receive control information or data. At this time, the mobile station can establish physical layer synchronization between the AP and the UE or adjust the transmission power.

After completing the connection setup with the AP, the terminal receives the service from the AP through the off-loading, CA, or RRA functions (S312). If the offloading function is supported, the terminal can receive services using only the AP in accordance with the control of the base station, or in a state in which the connection with the base station is not released according to the determination of the terminal or the user. When the CA or RRA function using both the base station and the AP's radio resources is supported, the terminal can receive the service by maintaining connection or connection to both the base station and the AP.

Meanwhile, the UE according to another embodiment of the present invention can perform measurement on the AP using the signal transmitted from the AP and the common information. In this case, the terminal does not use the AP information transmitted by the base station. At this time, in order to receive signals and common information transmitted by the AP, the terminal can establish a connection with the AP by attempting to access the AP and allocating resources capable of providing services. Then, the terminal reports the measurement result to the AP or the AP, and transmits a control message for requesting support of off-loading, CA or RRA function. Alternatively, the terminal may transmit a control message for unilaterally reporting the measurement result to the base station or the AP, requesting the support of the off-loading, the CA, or the RRA function without establishing a connection with the AP. When the UE requests the offloading, the CA, or the RRA function without the AP information of the base station, the base station or the AP can transmit a response message to the terminal for a support request for off-loading, CA or RRA function.

As described above, the terminal can receive a service using a CA or RRA function that offloads data of the mobile communication network using the AP or uses the radio resources of the AP and the AP at the same time. At this time, offloading of data, CA, RRA, or the like may be performed such that the terminal reports the information of the AP to the base station, the user sets an activation function indicating that the AP is used, or the user clicks the AP icon of the terminal monitor The control message including the AP search attempt may be transmitted to the user. The terminal may request data base station offloading, CA or RRA based on AP information, and data offloading is a service switching to AP. CA or RRA is a concurrent service of base station and AP. At this time, the terminal can report the AP identifier, AP signal strength, load status information, preference AP information for cooperative communication with the AP, and the like to the base station.

The base station can transmit an AP SIB that transmits system information blocks (SIBs) and AP-related information and related parameters that constitute system information to terminals in the service area of the base station. At this time, the base station transmits information (for example, AP identifier information, AP frequency band information, geographical location information of the AP, etc.) of the AP that the base station can control or connect to, Threshold, measurement cycle timer information, etc.) to the terminal in the service area of the base station as the AP SIB. The AP information may be composed of at least one AP list format, and may include identifier information for each AP, frequency band and system bandwidth information of the AP, geographical location information of the AP, and the like. For example, the AP identifier information is information indicating an identifier for identifying the AP, and may include at least one of SSID, BSSID and HESSID in case of a WLAN AP. In the case of a new AP, it may include a base station identifier information of a LTE system or a partial identifier composed of a part of a base station identifier, a unique identifier capable of distinguishing a new AP in the system, and a physical layer identifier for a new AP.

The AP frequency band and system bandwidth information included in the AP SIB may include at least one of information indicating the transmission frequency of the AP, the system bandwidth supported by the AP, or the specification version information supported by the AP described in the AP list . The geographical location information of the AP may include location information provided for the LBS of the terminal or information provided to estimate the location of the terminal.

The AP measurement related information may be a reference value for the AP received power as a reference value for AP measurement used by the terminal to receive a service from the AP or to determine service switching for data offloading. For example, reference values such as RSSI, SIR, EbNo, RCPI, RSNI, RSRP, RSRQ, or RSCP may be provided from the base station via the AP SIB. The terminal may also measure the received power and report the measurement result to the AP in the AP list of the AP SIB or the AP in the measurement and reporting parameters set by the base station through the dedicated control message, if necessary.

The AP SIB may include load status information of an AP included in the service area of the base station. The load status information of the AP may be transmitted by the AP through a beacon (or other system information), or it may be the load status information of the AP that the base station has collected via a separate procedure. In an embodiment of the present invention, in order to measure the load status of APs included in the service area of the base station, the access point attempts to access the AP and attempts to access during the predetermined time interval (or timer) And report the connection success rate or connection failure rate of the AP to the base station. (Or transmission rate), data retransmission rate, CS (whether or not to acquire radio resources) from the access AP or transmitted to the access AP during a predetermined time interval (or timer) after the terminal accesses the AP The time required to acquire the resource after the acquisition of the resource, or the time taken to acquire the resource from the time when the acquisition of the resource is required and the like, and report the measurement result to the base station.

When the AP SIB is changed, the base station can inform the terminal in the service area of the base station of the change of the AP SIB separately from the system information change notification. In accordance with an embodiment of the present invention, a base station may send a scheduling identifier (e.g., a cell-radio network temporary identifier (C-RNTI) ), Etc., some scheduling identifier may be fixedly assigned to the terminal at the base station or system level. The base station can notify the terminal of a change in the AP SIB using a fixedly assigned scheduling identifier (e.g., AP-RNTI). The terminal may be in an 'AP in use' state serviced through an AP, or the terminal may use an AP function (that is, a service providing function through a WLAN AP or a new AP), or an AP function of the terminal may be in an active state , The WLAN AP or the new AP function of the terminal is activated), the UE can update the AP SIB after detecting the AP-RNTI in the area to which the scheduling information is transmitted and receiving the changed AP SIB. If the terminal does not use the AP function of the terminal or if the AP function of the terminal is in an inactive state, the terminal may ignore the detection of the AP-RNTI or omit the AP SIB update.

Also, according to an embodiment of the present invention, a base station can use an AP-RNTI to transmit a control message to an AP, and can further allocate an RNTI for interworking with an AP. In one embodiment of the invention, the base station will be further referred to a RNTI assigned AP-RNTI ₂ in order to interlock with the AP. The base station transmits the AP-RNTI or (E.g., a physical downlink control channel (PDCCH) or an enhanced PDCCH (enhanced PDCCH, ePDCCH) of an LTE system) using the AP-RNTI ₂ . After that, the terminal transmits an AP-RNTI or A modulation and coding scheme (MCS) indicated by the scheduling information transmitted using the AP-RNTI _{2 -} can be applied, and an AP (Radio Network Controller) Lt; RTI ID = 0.0 > a < / RTI >

The control message for the AP operation may be configured in the form of an AP list using the AP SIB. In addition, the control message for the AP operation may include AP information (e.g., identifier information of the AP, frequency band and system bandwidth information of the AP, geographical location information of the AP), AP measurement related information Threshold, measurement cycle timer information, etc.), or load status information of connectable APs.

If necessary, the BS may transmit the control message as a dedicated control message to the UE using a scheduling identifier (C-RNTI) uniquely assigned to the UE. The base station may also transmit resource allocation information for the target AP of the offloading to the mobile station through a dedicated control message for data offload to the AP, if necessary.

In an embodiment of the present invention, the base station may be configured to provide an off-loading function to the target AP, based on measurement results of the terminal, pre-negotiation between the base station and the AP, or operations and maintenance (OAM) Can be selected. In the information exchange (or negotiation) between the base station and the target AP of the selected offloading, the AP delivers the AP resource allocation information for the offloading terminal to the base station, and the base station can transmit the resource allocation information of the target AP to the terminal. The UE uses the resource allocation information of the target AP to allocate the frequency and time resources through the CS excluding the competition such as CS or other APs located in the service area of the target AP (i.e., without conflict) The service can be provided through the frequency and time resources.

If the control messages for the AP operation in the base station, which are transmitted in a manner other than the transmission method of the AP SIB information or the system information, are configured in list form, the order of the list may indicate the order of connection easiness for the AP . At this time, the connection priority order or the load state can be considered for the connection to the AP.

In an embodiment of the present invention, when the terminal reports information on APs in the form of a list, the order of the APs included in the list in the report control message depends on the order of the terminal's preferred AP, The order according to the received signal strength can be indicated.

The preference information of a terminal transmitted from a terminal to a base station according to an exemplary embodiment of the present invention is not limited to the information of the AP acquired by the terminal but may also be a system, (Or connection establishment) preference ranking information for the APs. In addition, the preference ranking information may include connection priority information for the wireless communication system set by the user or connected to the terminal in a separate method or connected according to the measurement result of the terminal. For example, information about a cellular system, a WLAN system, or a preference ranking for a U-LTE system may be included. In this case, the cellular system may be a 2G (2G) mobile communication system (such as GSM or IS-95), a 3G mobile communication system (WCDMA or cdma2000), a 4G mobile communication system (LTE or LTE- A, etc.). That is, the terminal may include information on a priority order in which the terminal desires to access the wireless system when accessing a cellular system, a WLAN system, or other unlicensed band wireless access system.

For example, the priority information can be configured as shown in Table 1 below, and the preference information on the priority can be configured as shown in Table 2 below.

Configure preferred system mapping information Preferred system representation bit Preferred system 000 3G WCDMA system 001 LTE / LTE-A macro cell 010 LTE / LTE-A Small Cell 011-100 Reserved 101 Unlicensed band system (WLAN) 110 Unlicensed band system (U-LTE) 111 Reserved

Preferred information transmitted by the terminal Preferences Remarks 110 Priority 1 010 Priority 2 101 Priority 3 001 Priority 4

Referring to Table 1, although the mapping information for the preferred system is represented by 3 bits, it may be composed of 4 bits or more or 2 bits. The information about the preference system mapped to the presentation bit may be broadcast to the terminal through the system information, signaled via the dedicated control message, or stored at the time of registration of the terminal or in a universal subscriber identification module (USIM) Terminal or a user.

Table 2 shows an example of the preference information transmitted by the terminal, and the priority order may be displayed in descending order or ascending order. For example, when the preference information of the priorities shown in Table 2 is transmitted, when the base station establishes a wireless connection or a connection for a service connection of the UE, the order of preference of the UE is the un- / LTE-A small cell 010, an unlicensed band system (WLAN) 101, and an LTE / LTE-A macro cell 001.

In one embodiment of the present invention, the preference information of the terminal is transmitted in the form of a parameter belonging to a control message constituting a feature group indicator (FGI), or when a wireless connection or connection setup is attempted, Or a lower parameter in the control message). It can also be transmitted during service provision according to the user's selection, and can also be transmitted through a control message (or a lower parameter in the control message) that is transmitted during the control procedure of releasing the connection setting or ending the wireless connection. Or a control message of a non-access stratum (NAS). At this time, the lower parameter in the control message or the control message may be configured in the form of a Layer 3 RRC control message or a Layer 2 MAC control message.

In another embodiment of the present invention, a base station can provide services to a terminal using a WLAN AP or a new AP without consultation with the terminal. For example, the base station can recognize the necessity of providing an arbitrary service to the terminal using the AP during service provision or connection for service provision, and can decide to provide the service using the AP. At this time, as shown in step S301 of FIG. 3, the terminal can provide the WLAN AP information and receive the measurement result of the WLAN AP provided with information from the terminal. Then, the base station can determine whether to provide the service through the AP based on the measurement result reported by the UE. Thereafter, when the service provided through the AP is terminated or the need to provide the service through the AP disappears, the base station terminates the service through the AP.

The base station can transmit a control message to the terminal to activate the AP function if the AP function of the terminal is inactivated. When the service provided through the AP is terminated, the base station can transmit a control message for deactivating the AP function of the terminal to the terminal so that the terminal can instruct the terminal to deactivate the AP function. The activation / deactivation control message for the AP function of the UE may be included in the RRC control message, the MAC control message, or the physical layer control message. In another embodiment of the present invention, the AP function of the terminal can be activated or deactivated for a specific AP, and can be activated or deactivated only by the AP measurement of the terminal. Activation or deactivation of the AP function of the terminal is to prevent the terminal from unnecessarily performing AP measurement, thereby reducing power consumption of the terminal. The AP function activation / deactivation control of the terminal by the base station can be set by the user and can be set at the time of initial registration of the terminal or at the time of subscription to the service or depending on the capability condition or setting condition of the terminal, You can control the activation / deactivation of the AP function.

4 is a flowchart illustrating a radio resource collection method according to another embodiment of the present invention.

The new AP can apply the new wireless access standard using the frequency of the unlicensed band based on the wireless standard of the 3GPP LTE or LTE-A system. In an embodiment of the present invention, a system providing a network node function according to a wireless access standard of an unlicensed frequency band based on a LTE / LTE-A based wireless access standard is called an unlicensed-LTE (U-LTE) do.

In the U-LTE system, the LTE base station is set as the primary cell and the U-LTE node (base station, cell, AP, or new AP) in the unlicensed frequency band is set as the secondary cell. In the U-LTE system, if the RRA function is supported, the U-LTE node may not transmit common information for efficient off-loading. Also, the U-LTE node may not transmit the scheduling information for the radio resource allocation, and may transmit the radio resource allocation information of the U-LTE node by applying the cross-scheduling scheme to the LTE base station. At this time, the UE can receive radio resource allocation information for the U-LTE node from the main cell through the physical layer control channel or the physical layer shared channel.

First, the UE receives information related to a U-LTE node and measurement related information through system information transmitted from the Node B (S401). The UE performs measurement on the U-LTE node (S402). Based on the measurement result, the UE determines whether it meets the triggering conditions of the CA or RRA that can be served using the radio resources of the LTE node and the U- Or a triggering condition for data offload that can be serviced using the radio resource of the U-LTE node. The UE can judge the necessity of data offloading, CA or RRA under a separate condition. When the UE determines that data is to be offloaded, CA, or RRA is required, the UE reports measurement results to the base station in accordance with the presetting of the base station or according to the instruction of the base station, for data offloading, CA or RRA function support S403). At this time, the UE can transmit a control message requesting data offloading, CA or RRA function support, as well as reporting measurement results for offloading data through the U-LTE node and supporting CA or RRA functions.

The base station, which has received the measurement results and offloading of data from the mobile station and the CA or RRA function support request, determines whether to offload the data or support the CA or RRA function (S404). At this time, the base station can exchange control signaling messages such as parameter setting for U-LTE node, data offloading, CA or RRA function using a separate interface (S405). When the base station decides to support offloading of data, CA, or RRA function, the base station can exchange control messages for U-LTE, data offloading, CA or RRA function support request and response to support request.

After completing the negotiation with the U-LTE node, the base station transmits information of the U-LTE node for off-loading of data and supporting CA or RRA function to the terminal (S406). Upon receiving the information of the U-LTE node for data offloading from the base station and supporting the CA or RRA function, the UE acquires synchronization or connection setup with the target U-LTE node according to the information included in the control message received from the base station The process proceeds (S407). The UE that has completed the synchronization acquisition or connection setup for the U-LTE node reports completion of synchronization acquisition or connection setup to the base station (S408). At this time, the UE performs synchronization acquisition or connection setup for the target U-LTE node according to the information included in the control message, and reports the completion of the synchronization acquisition or connection setup for the U-LTE node to the base station The steps may optionally be omitted. Then, the base station notifies the UE of the target U-LTE node through synchronization acquisition or connection establishment completion report for the U-LTE, or after the predetermined time has elapsed (or when the predetermined timer expires) It can be seen that the terminal is ready to support offloading of data, CA or RRA functions.

If the base station notifies the UE of completion of data preparation, CA or RRA ready completion of data transmission or completion of the timer based on the completion report, the base station requests U-LTE to support data offloading or CA or RRA functions (S409). At this time, the step of requesting the base station to support the off-loading of data and the CA or RRA function in the U-LTE may be omitted.

Before the U-LTE node provides a service based on off-loading of data, CA, or RRA function to the UE, the base station may transmit the radio allocation information between the U-LTE node and the UE to the UE (S410). That is, in the case of transmitting packet data to only the U-LTE node (excluding the LTE base station), such as offloading, or the CA or RRA in which the base station and the U- - The LTE node does not set the physical layer control channel to which the radio resource allocation information is transmitted separately. In an embodiment of the present invention, a separate control message including radio resource allocation information of a U-LTE node (for example, a media access control (MAC) control message or a radio resource control (RRC) control message) may be transmitted to the UE. When the base station transmits the radio resource allocation information for the U-LTE node to the UE using the physical layer control channel, it can confirm whether the UE has successfully received the scheduling information (i.e., the radio resource allocation information for the U-LTE node) An uplink control field (or feedback information) may be set. That is, when a base station transmits radio resource allocation information of a U-LTE node to a physical layer control channel, a UE successfully receiving radio resource allocation information of a U-LTE node transmits a control field on an uplink physical layer control channel Or feedback information) to the base station. For example, a separate uplink control channel may be configured, or a control field may be additionally configured to an existing uplink control channel, and the UE may transmit a control field through a control field configured additionally to an uplink control channel or an uplink control channel It is possible to report to the base station whether the U-LTE node successfully received the radio resource allocation information.

Alternatively, if necessary, the U-LTE node may transmit a separate control message including radio resource allocation information to the mobile station by a physical layer channel (e.g., PDSCH of the LTE system) that transmits data other than the PDCCH, And transmits the radio resource allocation information together with the data to the mobile station. At this time, there is a case where PDCCH is not set in the U-LTE node or PDCCH resources are insufficient.

Finally, when the U-LTE node completes the connection setup with the UE, the U-LTE node can provide a service based on data off-loading, CA or RRA functions to the UE (S411). In this case, the connection establishment between the terminal and the U-LTE node can be performed when the base station transmits the information of the target U-LTE node to the terminal. In this case, the terminal transmits the target U- The LTE node can receive the service.

Considerations for defining the radio access standard of the U-LTE node using the unlicensed frequency band are as follows. Unlike LTE / LTE-A systems that use licensed frequencies, unlicensed bands should not affect other wireless devices or other U-LTE devices that use the same frequency band. For example, the transmission signal strength of a base station, a cell, an AP, a small base station, a terminal, or a device constituting a wireless backhaul conforming to the U-LTE radio access standard should not exceed the maximum signal strength required in the unlicensed band. In addition, when a U-LTE device tries to access or attempt to access wireless resources, if another wireless device is already connected or occupies wireless resources, Must be able to occupy. That is, the U-LTE system such as a CS-based carrier sensing multiple access (CSMA) or a carrier sensing multiple access / collision avoidance (CSMA / CA) (E.g., a new AP, a small base station, a terminal or a transceiver constituting a wireless backhaul) must be able to search for or monitor a wireless channel before transmitting an access signal or data signal. That is, a listen before talk (LBT) or a robust co-existance mechanism (RCM) is required.

An apparatus (e.g., a new AP, a base station, or a terminal supporting U-LTE function) of a U-LTE system according to an embodiment of the present invention may use The mobile station can perform a search, a listening, a monitoring, a sensing, or a measure (hereinafter referred to as a 'search operation') on the radio channel of the frequency to be transmitted. The radio channel sensing, listening, monitoring, sensing or measuring operation can be performed for a preset time interval, and the predetermined time interval can be expressed as a time for which the timer operates. Further, the U-LTE apparatus can acquire information about the search operation of the radio channel (hereinafter referred to as "channel search information") by itself or can receive it from the base station of the LTE / LTE-A system.

When a U-LTE apparatus according to an embodiment of the present invention acquires channel search information by itself, the U-LTE apparatus searches for a preset time before transmitting a signal for an operating frequency of a previously stored or known unlicensed band, Operation can be performed to check whether there is a signal in the wireless channel. At this time, if there is another wireless device or another U-LTE device using the wireless channel, the U-LTE device checks the strength of the signal detected in the wireless channel, the period of the signal, do. If the U-LTE apparatus according to an embodiment of the present invention satisfies a condition that no other apparatus exists in the unlicensed frequency band in which the search operation is performed or does not affect other apparatuses even if it exists, the U- Lt; / RTI > The U-LTE AP may send a common control signal such as a beacon, advertisement signal, or system information, or may attempt to make a service request.

A U-LTE apparatus according to another embodiment of the present invention can receive or obtain channel search information for a frequency of an unlicensed band from a base station of an LTE / LTE-A system. When a terminal supporting the U-LTE function camps in an arbitrary base station, the terminal supporting the U-LTE function can acquire channel search information from the system information of the base station. At this time, information on an operation frequency, a bandwidth, a device identifier, a load status, a connection priority, or a support function for a U-LTE device connectable within a service area of the base station or around the service area is transmitted through a separate SIB or information Can be transmitted through an existing SIB to which an information element (IE) is added. In addition, when a device supporting U-LTE function is provided with a connection with any other device, the operation frequency, bandwidth, device identifier, load status, connection priority, Information about the support function may be conveyed via a separate dedicated control message or may be obtained via system information.

5A through 5E are diagrams illustrating a radio frame of a U-LTE system according to an embodiment of the present invention.

In order to solve the co-existance problem, the U-LTE apparatus according to an embodiment of the present invention determines whether there is another wireless system device or a U-LTE apparatus in the vicinity before transmitting a signal or data . That is, the U-LTE apparatus can operate the U-LTE apparatus in a manner that can divide the radio resources for the U-LTE apparatus into a contention-based area and a contention-free basis, in order to effectively perform a search operation. For example, the U-LTE device performs a search operation in a contention-based area, and performs initial access (random access) or connection request ) Can be performed. When the initial connection or connection request is completed, the U-LTE apparatus can receive the service using the contention-based domain or the contention-based domain.

Referring to FIG. 5, a radio resource for a U-LTE apparatus includes an area (contention-based area) obtained through a contention-based competition and a non-contention-based area allocated through scheduling. In FIG. 5, one radio frame includes at least one sub-frame.

Referring to FIGS. 5A and 5B, a contention-based region and a contention-based region are divided on a time axis.

Referring to FIG. 5A, one radio frame includes one contention-free domain 511 and one contention-based domain 512. According to one embodiment of the present invention, one radio frame may include the same number of contention-free areas 511 and contention-based areas 512. The number of subframes included in the contention-free area 511 and the contention-based area 512 may be variably set for each radio frame. For example, if the length of a radio frame is 10 ms and the length of each subframe is 1 ms, the contention-free area 511 and the contention-based area 512 may include five subframes, respectively. Contention-based region 511 may include seven subframes, and the contention-based region 512 may include three subframes. Information on the number of subframes included in each region may be transmitted to the U-LTE apparatus through system information, a beacon, an advertisement message, a dedicated control message, or physical layer control channel information. In an exemplary embodiment of the present invention, the number of subframes included in each area may be changed dynamically on a radio frame basis. In this case, the setting information changed through the beacon, advertisement message, .

In the case where resources are allocated or managed in the 1 ms subframe in units of 0.5 ms slots, the contention-based area and the contention-based area can be set in units of slots.

The physical layer control channel may be configured in the same format without distinguishing between the contention-free area 511 and the contention-based area 512. In this case, the physical layer control channel can be configured in the same format in each area. The unit of the physical layer radio resource (for example, a control channel element (CCE)) configuring the physical layer control channel, (For example, a method of allocating control channel radio resources through at least one CCE according to the size of control information), a method of determining MCS, etc. are performed for each physical layer control channel included in each area May be applied equally. In addition, a method of allocating a radio resource area by scheduling using a terminal identifier, a common identifier, or a terminal group identifier (e.g., a multicast identifier), or a method of masking control channel information through a scheduling identifier ) May be equally applied to the physical layer control channel included in each area.

The physical layer control channel includes a physical layer shared channel (e.g., a PDSCH of a LTE system, a physical uplink control channel (PICCH), and the like), such as a PDCCH, an ePDCCH, a physical uplink control channel field, an indicator, or a bit for transmitting packet data through an uplink shared channel (PUSCH) or the like).

The terminal identifier may be a C-RNTI for delivery of dynamic scheduling information, an SPS-RNTI for delivery of semi-persistent scheduling (SPS) information, or a transmit power control for delivery of physical layer power control information, (TPC-PUCCH-RNTI), a TPC-PUSCH-RNTI, and the like.

The common identifier includes a paging RNTI (P-RNTI) for scheduling radio resources carrying paging information, a system information RNTI (P-RNTI) for scheduling radio resources carrying system information, , A random access RNTI (RA-RNTI) for scheduling radio resources carrying a random access response or other control message during random access, a multimedia broadcast and multicast An M-RNTI (MBMS-RNTI) for notifying a change of MBMS control information or a MBMS multicast control channel (MCCH) information, And a contention resource-RNTI (CR-RNTI) for scheduling the radio resources.

According to another embodiment of the present invention, a physical layer control channel may be configured in different formats for each contention-free area 511 and contention-based area 512. Referring to FIG. 5A, the contention-free area 511 includes three physical layer control channels 513, and the contention-based area 512 includes one physical layer control channel 514. FIG. At this time, the physical layers included in each area (non-contention-based area and contention-based area) are mutually connected to each other by a physical layer radio resource unit (for example, CCE) For example, a method of allocating control channel radio resources using at least one CCE according to the size of control information) and an MCS method may be different.

In accordance with one embodiment of the present invention, a reference signal (RS) or a pilot symbol (515) for channel quality measurements or interference measurements may be used equally in non-contention-based regions and contention-based regions .

Referring to FIG. 5B, one radio frame includes two contention-free areas 521 and one contention-based area 522. According to another embodiment of the present invention, unlike FIG. 5B, one radio frame may include one contention-free area and at least two contention-based areas, or one radio frame may include contention- At least two of them may be included. As shown in FIG. 5A, the physical layer control channels 523 in the contention-free area and the contention-based area can be configured in the same way or in different ways. 5B, the contention-based area 521 may include three physical layer control channels 523, and the contention-based area 522 may include one physical layer control channel 524. FIG.

The reference signal or pilot symbols 525 and 526 may be set differently in each radio resource region. 5B, the first reference signal 525 included in the contention-free area 521 and the second reference signal 526 included in the contention-based area may be different from each other. The reference signals 525 and 526 applied to the contention-free area 521 and the contention-based area 522 according to an embodiment of the present invention are used for the purpose of channel quality measurement, interference measurement or coherent demodulation, A common reference signal or a terminal-specific reference signal may be applied. In the common reference signal, the position (the symbol position on the time axis of the subframe or the radio frame or the subcarrier position on the frequency axis), the type and index of the scramble code (or sequence) May be set according to the node (AP or base station) to which the signal is applied. In the reference signal for each terminal, the position in the radio resource, the scramble code type and index, and the frequency of the reference signal can be set for each terminal. In one embodiment of the present invention, a reference signal for each terminal may be applied to the contention-based region, and a common reference signal or a reference signal for each terminal may be applied to the contention-based region. Alternatively, according to another embodiment of the present invention, in the contention-based area 522, a reference signal of the non-contention-based area 521 and a common reference signal, which is configured with a radio resource location, a scramble code form and index, Or a terminal-specific reference signal may be applied.

Referring to FIGS. 5C and 5D, the contention-based domain and the contention-based domain are separated on the frequency axis.

Referring to FIG. 5C, one radio frame includes one contention-free domain 531 and one contention-based domain 532. The number of subcarriers included in each area can be variably set in units of radio frames. For example, referring to FIG. 5C, when the system bandwidth is 10 MHz and the number of subcarriers included in the system bandwidth is 80, the number of subcarriers included in the contention-based area and the contention-based area may be 40 have. Alternatively, according to another embodiment of the present invention, the contention-free area may include 60 subcarriers, and the contention-based area may include 20 subcarriers. In addition, the physical layer control channel 533 configured in the same format in the contention-free area and the contention-based area can be used. As described above, the physical layer control channel 533 can be configured according to a unit of a physical layer radio resource such as a CCE, a configuration method of occupied radio resources, or a method of determining an MCS. In addition, the reference signal 534 applied to the contention-free area 531 and the contention-based area 532 may be applied to the non-contention-based area 531 and the contention-based area 532 according to the purpose of channel quality measurement, interference measurement, coherent demodulation, A reference signal can be applied.

Referring to FIG. 5D, one radio frame includes two contention-based regions 541 and one contention-based region 542. Or one radio frame may include one non-contention-based region and two or more contention-based regions, or may include two or more contention-based regions and a contention-based region respectively. 5C, a physical layer control channel 543 configured in the same format in each area (non-contention-based area and contention-based area) can be used. In addition, reference signals 544 for channel quality measurements, interference measurements, or coherent demodulation, etc. may be set differently for each radio resource region. In the contention-free area 541, a common reference signal or a reference signal for each terminal may be applied according to the purpose of the reference signal such as channel quality measurement, interference measurement, or coherent demodulation. Although it is efficient in operation to apply the reference signal for each terminal in the contention-based area, the reference signal in the contention-free area, the frequency of the radio resource position, the scramble code type, the index and the reference signal, If differently configured, a common reference signal or a terminal-specific reference signal may be applied to the contention-based area.

Referring to FIG. 5E, the contention-based area 551 and the contention-based content area 552 are separated on the time axis and the frequency axis. The operation of the reference signal 554 and the physical layer control channel 553 in Fig. 5E can be selectively applied to the method described in Figs. 5A to 5D.

Although the non-contention-based region and the contention-based region according to an embodiment of the present invention shown in FIG. 5 are continuously allocated on the time axis or the frequency axis, according to another embodiment of the present invention, May be discontinuously allocated on the frequency axis. In addition, one radio frame shown in FIG. 5 may include n non-contention-based regions and m contention-based regions. The radio resource location of the reference signal and the physical layer control channel shown in FIG. 5 is one implementation, and in the case of the physical layer control channel, a certain bandwidth interval may be discontinuously allocated to a physical layer control channel in an arbitrary symbol interval . In addition, the physical layer control channel may be allocated every subframe, or may be allocated to a plurality of subframe periods according to a scheduling method. A node supporting the U-LTE function according to an embodiment of the present invention may configure separate physical layer control information on a radio frame basis and transmit physical layer control information on a physical layer control channel for each radio frame . At this time, the layer control information may include setting information regarding the dynamic composition ratio of the contention-based area and the contention-free area included in the radio frame. At this time, the physical layer control channel through which the physical layer control information of the radio frame is transmitted may be allocated separately at the beginning of each radio frame, or may be allocated to all or a part of the physical layer control channels existing for each subframe have.

The allocation of the radio resources described in FIGS. 5A to 5E may be based on a frequency division duplexing scheme or a time division duplexing scheme, which is a duplexing scheme. In the case of the FDD scheme, a radio frame and a subframe of a radio link (radio link or wireless link) for downlink from a network node to a terminal, an uplink from a terminal to a network node, And the non-contention-based region and the contention-based region can be allocated according to the method described in FIG. Also in the TDD scheme, non-contention-based regions and contention-based regions may be allocated to a part of the DL subframe or the UL subframe according to the method described in FIG. For example, according to the TDD scheme, a plurality of subframes included in one radio frame are allocated as downlink radio resources and uplink radio resources, respectively, and each of the subframes allocated as a downlink or uplink includes a contention- And a contention-free area may be allocated.

In a U-LTE system, a network node transmits a polling signal or a resource allocation request (e.g., a scheduling request (SR)) signal for requesting a radio resource for each U-LTE apparatus that maintains a connection for a service Lt; RTI ID = 0.0 > resources. ≪ / RTI > That is, the U-LTE node may transmit a polling signal or a resource allocation request signal when a connected U-LTE device needs a physical layer control channel or a separate physical layer radio resource May be uniquely assigned to each U-LTE device (or U-LTE device group). At this time, the radio resource of the physical layer for transmission of the polling signal or the resource allocation request signal may be allocated in the step of establishing a connection with the U-LTE node of the U-LTE device.

The U-LTE device in a connected state can transmit a polling signal or a resource allocation request signal when a radio resource to transmit a signal to a network node or another U-LTE device is required. The network node or another U-LTE device that receives the polling signal or the resource allocation request signal transmits the radio resource allocation information to the U-LTE device that has transmitted the polling signal or the resource allocation request signal. The U-LTE device can overcome the compatibility problem by recognizing the signal transmission intent of another U-LTE device through a polling signal or a resource allocation request signal transmitted by another U-LTE device. That is, to overcome compatibility issues with other wireless devices, the U-LTE device may perform a sensing operation (e.g., CSMA / CA of a WiFi system) before sending a polling signal or a resource allocation request signal . Thus, a U-LTE device can have less impact on other wireless devices or other U-LTE devices, and can overcome compatibility problems.

According to an embodiment of the present invention, when the radio resources of the U-LTE system are divided into a contention-based domain and a contention-based domain, the network node transmits a polling signal or a resource allocation request signal transmitted by the U- And allocate the radio resources in the non-contention based area to the U-LTE device.

In a U-LTE system, the radio resource of a contention-based area is allocated, or, for the use of a contention-based area by a U-LTE device, It is possible to allocate only some radio resources of the contention-based area to the U-LTE device according to the attribute. Through the system information message or a separate dedicated control message for the U-LTE device, the network node can receive priority information for each U-LTE device, priority information according to service attributes, The mapping (or indication) information of the radio resource can be transmitted to the U-LTE device. At this time, the radio resources of the indicated contention-based area based on the priority of the U-LTE device or the attributes of the provided service can have a mapping relation according to each priority order. The radio resources of the contention-based area, which is mapped to an arbitrary priority or allowed to use, can be used on the basis of contention by the U-LTE devices allowed to access, and the U- Priority.

The U-LTE apparatus that receives the priority information and the mapping information on the radio resources of the contention-based area through the system information or the dedicated control message is used according to the priority of the U- The necessary information can be transmitted using only the radio resources of the possible contention-based area. Therefore, the U-LTE apparatus having the connection with the network node of the U-LTE system can transmit the packet data using the radio resource of the indicated contention-based area based on the priority assigned to the U-LTE apparatus or the attribute of the provided service have.

When the U-LTE device transmits packet data using the contention-based area, the U-LTE device can transmit the identifier information allocated to the U-LTE device together. The network node (or another U-LTE apparatus) successfully receiving the packet data from the U-LTE apparatus through the radio resource of the contention-based area transmits the received identifier information back to the U-LTE apparatus, To the U-LTE device. In this case, the identifier of the U-LTE device is an identifier by which any network node can uniquely distinguish the U-LTE device, and includes a scheduling identifier (for example, C-RNTI), a temporary mobile subscriber identity , TMSI, International Mobile Subscriber Identity (IMSI), or MAC address, for example, to identify the corresponding U-LTE device in the system.

When the packet data is transmitted to the radio resource of the contention-based area, a scheme in which the MCS scheme and a transmission mode (TM) are specified and a scheme in which the transmission scheme is not specified can be used. When the MCS scheme and the TM are specified, information on the MCS scheme and the TM specified for each contention-based area is transmitted. When the radio resources of the contention-based area are mapped according to the priority, different MCS methods and TM can be designated for each radio resource of the contention-based area mapped according to each priority. The information on the MCS scheme and the TM in the contention-based area can be transmitted to the U-LTE apparatus through the system information or the dedicated control message. When the MCS scheme and the TM are not designated, the U-LTE apparatus transmits information on the MCS scheme and the TM to the network node whenever the U-LTE apparatus transmits the packet data through the radio resource of the contention-based area. At this time, the U-LTE apparatus can transmit information on the MCS scheme and the TM together with the packet data, or can transmit it using a separate physical layer radio resource (for example, an uplink physical layer control channel).

The resource allocation scheme may be changed according to the priority of the U-LTE apparatus or the attribute of the service being provided. In order to overcome the compatibility problems in the unlicensed frequency band, if the emphasis is placed on the fairness between the U-LTE devices in terms of resource allocation, the transmission speed of the system may be lowered. Therefore, radio resources can be repeatedly allocated, even in a continuous or discrete manner, for a certain period by periodically allocating or semi-static scheduling for a service attribute having a high priority or a U-LTE apparatus. However, for low-priority service attributes or U-LTE devices, there is a U-LTE device resource allocation request, or the longest period allowed by the system, or only the smallest size (minimum base unit) Can be assigned.

A wireless device in an unlicensed frequency band, in accordance with an embodiment of the present invention, may determine whether there is another wireless system device or U-LTE device in the vicinity before transmitting any signal or data to avoid compatibility problems have. At this time, 'CS step' is performed to perform search operations such as U-LTE device investigation, listening, monitoring, sensing or measurement, and a 'communication step' have.

In the CS step, the U-LTE apparatus according to an embodiment of the present invention can determine whether the U-LTE apparatus exists in the vicinity and can determine whether it can occupy radio resources in an unlicensed frequency band and transmit a signal. In the CS step, when signal transmission is possible by occupying radio resources in the unlicensed frequency band, the U-LTE device transmits radio resources in the contention-based area or U-LTE system for radio resources permitted for initial access or connection request To perform an initial connection or connection request. At this time, the U-LTE device may perform an initial connection or connection request in the communication step.

Then, the U-LTE device can complete the search operation for the neighboring U-LTE device and perform the communication step. That is, the U-LTE device can provide the service or receive the service through the communication step. The radio resources used in the communication step may be radio resources divided into the contention-based domain or the contention-based domain of FIG.

A U-LTE apparatus according to an embodiment of the present invention can transmit a reference signal for a search operation or a message in an initial access or connection request using radio resources in a contention-based region. When a U-LTE apparatus transmits an existing signal of a search operation using a radio resource of a contention-based region, a period of a reference signal, a type of a signal sequence, a location of a radio resource (for example, The position of the symbol), the transmission scheme (e.g., MCS scheme), the scramble pattern or the hopping pattern, etc., may be set to match the attributes of the contention-based domain. That is, in a radio resource of a contention-based area, a period of a reference signal, a type of a signal sequence, a location of a radio resource, a transmission scheme, a scramble pattern or a hopping pattern, (E.g., a cell specific parameter) or a terminal group based parameter, rather than a UE specific parameter. At this time, separate scheduling information for the physical layer control channel for transmitting a signal or a message occupying radio resources of the contention-based domain is not required. When the reference signal is transmitted through the radio resource of the contention-based area, the period of the reference signal, the format of the signal stream, the location of the radio resource, the transmission scheme, the scramble pattern or the hopping pattern are per- , Or may be notified to the U-LTE device prior to use of the radio resource through the transmission of common control information such as system information transmission.

In a case where a U-LTE apparatus according to an embodiment of the present invention transmits a signal through a radio resource in a contention-free area, scheduling information using a predetermined scheduling identifier is transmitted, and the U- Only the information associated with the scheduling identifier can be transmitted. Therefore, regardless of the downlink or uplink, only UEs (or terminal groups) or scheduling identifiers that are allowed to occupy through physical layer control channels or separate control signaling, and information associated with them in the non-contention- . RNTI, SP-RNTI, C-RNTI, TPC-PUCCH-RNTI, or TPC-PUSCH-RNTI . A separate scheduling identifier, e.g., multicast (MC) -RNTI, can be defined and used when scheduling information for a radio resource is transmitted on a physical layer control channel to at least one UE. In one embodiment of the present invention, radio resource allocation information for at least one UE can be transmitted through the MC-RNTI, which is a scheduling identifier for multiple transmission, and a UE or U-LTE device May obtain the scheduling information and provide or receive the service through the radio resource designated in the scheduling information.

In addition, according to an embodiment of the present invention, a contention resource (CR) -RNTI is used as a scheduling identifier for transmission of resource allocation information in a physical layer control channel for setting or allocating radio resources in a contention- Can be set. The radio resources in the contention-based area may be notified to the U-LTE apparatus by presetting, and may be allocated to radio resource allocation information (for example, allocation information of allocated radio resources The radio resource of the contention-based area may be specified in the transmission format including the location or size, modulation and coding, or the transmission format (e.g., antenna configuration, CA configuration, transmission carrier identifier, resource allocation purpose, etc.). Also, in the entire system or at any network node, at least one MC-RNTI or CR-RNTI may be set and used.

Meanwhile, in one embodiment of the present invention, the operation of the CS step should not affect the U-LTE device as well as the initial transmission and reception operations as well as other U-LTE devices and other wireless devices in the same unlicensed frequency band. Priority may be given to the LTE AP or the base station in the operation of the CS step. At this time, the priority may be a signal sequence, a form, or a scramble index of a physical channel symbol such as an AP identifier, a primary synchronization signal (PSS), a secondary synchronization signal (SSS) For example, a scramble code or a sequence index). The AP having a lower priority in the CS step can concede the occupation of radio resources when a higher priority AP is found in the searching operation for determining whether there is a device of another radio system or a U-LTE device in order to avoid a compatibility problem . At this time, if an AP having a low priority or a low priority AP is providing the service, the service is terminated and the occupancy of the radio resource is yielded.

In order to minimize the impact on other wireless devices (e.g., WLAN devices) at the moment that the U-LTE device is turned on, energy detection (ED) as defined in the WLAN specification, CSMA / CA , Or CSMA / CD (collision detection), and the like. That is, after confirming that the U-LTE apparatus has no influence on the WLAN apparatus, it can be operated according to the operating procedures and criteria defined in the U-LTE system. U-LTE devices can use the system information transmitted periodically to check the impact of other peripheral devices at the moment of powering on the U-LTE device. That is, the U-LTE node periodically broadcasts system information, which is common control information, to the service area in a predetermined subframe. The U-LTE device, which is powered on, transmits U- (Energy detection) of a radio resource (e.g., a specific subcarrier or a specific subcarrier group) to which system information is transmitted in a specific subframe in which the system information is transmitted, or measures a reference signal of a radio resource to which system information is transmitted It is possible to confirm whether a compatibility problem has occurred.

After that, the U-LTE apparatus completes the operation procedure at the moment when the power is turned on, confirms that there is no influence to other radio devices, and then transmits the scheduling information for the occupied radio resources continuously or discontinuously, Or by transmitting the setting information of the non-contention-based area, it is possible to avoid the compatibility problem and to occupy the radio resources that can be provided or provided with service without affecting other devices. The scheduling information for the contention-free area can be transmitted to the terminal or the terminal group through the physical layer control channel. In this case, the above-mentioned AP-RNTI, SI-RNTI, P-RNTI, RA-RNTI, M-RNTI, C-RNTI, SPS-RNTI, C-RNTI and MC-RNTI may be used as the scheduling ID. The scheduling information may include information such as the location or size of the allocated radio resource, a transmission scheme including modulation and coding, a transmission scheme, and the like. The scheduling information may be transmitted through a physical layer control channel or a physical layer shared channel Lt; / RTI >

In the U-LTE system, scheduling information refers to radio resource allocation information transmitted to a U-LTE device. The radio resource allocation information may be configured with parameters for the location or size of the allocated radio resource, a transmission scheme including modulation and coding, a transmission scheme, and a resource allocation scheme. Radio resource allocation information for an arbitrary U-LTE device may be transmitted on a subframe basis, periodically on a predetermined subframe interval, or aperiodically on any subframe. In the conventional LTE / LTE-A system, the scheduling information is basically transmitted as radio resource allocation information for one subframe. In a U-LTE system according to an embodiment of the present invention, the scheduling information may be transmitted as radio resource allocation information for a plurality of subframes. The radio resource allocation information according to an embodiment of the present invention includes allocation start radio frame and allocation start subframe information, allocation end radio frame and allocation end subframe information, or allocation interval information in a radio frame or a subframe unit . When radio resource allocation information for a plurality of subframes or a plurality of radio frames is transmitted, the U-LTE device may transmit feedback information indicating that radio resource allocation information has been successfully received. At this time, the feedback information can be transmitted using the specific field information of the physical layer control channel, and can be transmitted through the MAC control message or the RRC control message.

In order to overcome the compatibility problem, in the U-LTE apparatus according to the embodiment of the present invention, in a search operation to determine whether there is a device of another radio system or a U-LTE apparatus, Of the service. In a U-LTE system according to an exemplary embodiment of the present invention, some radio resources of a physical layer control channel are used to determine whether a physical layer control channel exists, a physical layer control channel format or setting information (e.g., Size, transmission format, information on the next physical layer control channel, etc.), and the like can be transmitted. At this time, the format or configuration information of the physical layer control channel may be transmitted through some radio resources for the physical layer control channel or a region separately designated from the radio resources of the physical layer. In addition, the format or setting information of the physical layer control channel may be a fixed modulation and coding scheme, may be applied to a slot (a plurality of symbols), a subframe unit, or a plurality of slots, subframes, . The U-LTE apparatus according to an embodiment of the present invention searches for or monitors the format or configuration information of a physical layer control channel and recognizes that other wireless devices are providing or receiving services in the corresponding frequency band. If the format or configuration information of the physical layer control channel is not defined or applied at the system level, the U-LTE system transmits common control information periodically transmitted or non-periodically transmitted common information such as system information or beacon information A paging message, an AP related common control message, etc. transmitted through the RA-RNTI, the P-RNTI, the AP-RNTI, etc.) and provides services to other wireless devices in the corresponding frequency band It can be recognized that it is provided.

According to an exemplary embodiment of the present invention, a U-LTE apparatus transmits a radio resource of a subframe or a radio frame using a reference signal transmitted in a subframe or a radio frame, a masking applied to a pilot symbol, a code or a sequence for scrambling, Lt; RTI ID = 0.0 > wireless < / RTI > In a U-LTE system according to an embodiment of the present invention, a certain type of scramble code or sequence, a specific type of masking code or sequence is applied to a whole or fixed part of a signal constituting a reference signal or a pilot symbol, Or that there is a wireless device that uses the wireless resources of the wireless frame is implicitly or explicitly represented.

Therefore, the U-LTE apparatus according to an embodiment of the present invention for attempting to connect or start transmission in the unlicensed frequency band can receive information indicating the presence or absence of another wireless apparatus through the received signal strength of the reference signal or pilot symbol Thereby minimizing the impact on other wireless devices prior to initiating a connection attempt or transmission. At this time, the U-LTE apparatus according to an embodiment of the present invention can selectively combine the above-described methods.

Meanwhile, in the U-LTE system according to an embodiment of the present invention, the reference signal can be set differently according to the purpose of use. First, a reference signal is required to acquire downlink synchronization between the network node and the terminal and to confirm the physical layer identifier of the network node. In addition, a reference signal is required to measure the channel quality between the U-LTE devices, and a reference signal is required to estimate the position of the U-LTE device or to assist in position measurement. In addition, a reference signal is needed to support on-off operation of the network node for energy saving.

A reference signal (hereinafter referred to as a 'synchronization reference signal') for downlink synchronization acquisition between a network node and a terminal and confirmation of a physical layer identifier (for example, a physical cell identifier (PCI) Or SSS may be used or a new reference signal may be introduced. The synchronous reference signal has to be transmitted periodically, and it is efficient to support the frequency scalability that a part of the system bandwidth of the network node is limitedly used for transmission. When the PSS / SSS of the existing LTE / LTE-A system is used as a synchronization reference signal for the U-LTE device, the UEs other than the U-LTE UE do not have information on the masking or scramble sequence. Can not. However, after confirming the masking or scrambling sequence added to the PSS / SSS, the U-LTE apparatus can confirm the layered synchronization and physical layer identifiers of the network node in the same manner as in the existing LTE / LTE-A system. A method of confirming a masking or scrambling sequence added to a PSS / SSS transmitted by a network node of a U-LTE system is a method in which a U-LTE apparatus receiving a synchronous reference signal performs de-masking using a masking or scrambling sequence of a PSS / masking or de-scrambling to remove the masking or scrambling sequence and to detect the original PSS / SSS. A masking or scrambling sequence may be used for extension of the physical layer identifier, which may be set to PSS / SSS only if necessary. That is, the physical layer identifier represented by only the PSS / SSS is set to the physical layer identifier of the U-LTE apparatus by using the PSS / SSS and the masking or scrambling sequence of the PSS / SSS. For example, in the conventional LTE system, the physical layer identifier can be defined as Equation 1 below.

In Equation 1, N _ID ⁽²⁾ is determined by PSS may have a value between 2 from 0, N _ID ⁽¹⁾ is determined by the SSS and may have a value between 0 and 167. Therefore, the number of physical layer identifiers can be 504 (0 to 503, 9 bits).

The U-LTE system according to an embodiment of the present invention may use a bit obtained by adding a masking or scrambling sequence to a physical layer identifier represented by PSS / SSS to represent 504 or more physical layer identifiers as a physical layer identifier. For example, the physical layer identifier of the U-LTE system may be expressed by Equation 2 below.

In Equation ⁽²⁾ , N _ID ⁽³⁾ is a bit determined from a masking or scrambling sequence. Thus, the physical layer identifier of the U-LTE system can be extended by the range of bits determined from the masking or scrambling sequence. The PSS / SSS of the LTE / LTE-A system can also be extended as shown in Equation (2). The legacy terminal detects the physical layer identifier only by the PSS / SSS. After the physical layer identifier extension scheme is introduced, the terminal determines N _ID ⁽³⁾ from a new reference signal or a separate signal, The physical layer identifier can be detected through Equation (2).

In the U-LTE system according to another embodiment of the present invention, a new synchronization reference signal for the U-LTE apparatus can be set. The new sync reference signal according to another embodiment of the present invention may be transmitted periodically via some band limited in the system band (e.g., some subcarriers around the central subcarrier of the system bandwidth), such as the PSS / SSS of the LTE system . Then, the U-LTE apparatus combines the new synchronous reference signal of the U-LTE system with the PSS / SSS of the LTE system (transmitted in the same way as in the LTE system) to acquire the physical layer synchronization acquisition or physical layer identifier Can be detected. At this time, NID (3) may be determined from the new synchronization reference signal of the U-LTE system.

The PSS / SSS of the U-LTE system and the new synchronization reference signal are transmitted at intervals of 5 ms through 6 resource blocks (RBs) located at the center of the system bandwidth, such as the PSS / SSS transmission of the LTE system, It can be repeatedly transmitted. At this time, one RB may include 12 subcarriers. The new synchronization reference signal of the U-LTE system can be mapped to radio resources other than the PSS / SSS of the U-LTE system. The PSS / SSS of the U-LTE system and the new synchronous reference signal may have different transmission periods than the PSS / SSS of the LTE system as needed.

According to another embodiment of the present invention, the reference signal of the existing LTE / LTE-A system may be modified and used as a synchronization reference signal of the U-LTE system. The modified sync reference signal of the U-LTE system can also be transmitted and extended as described above.

The reference signal for measuring the channel quality between the U-LTE devices may be a node specific RS specific to the network node of the U-LTE system and a UE specific RS specific to the U-LTE UE . The node specific reference signal may be transmitted in every subframe in the radio frame or in a specific subcarrier and symbol of a predetermined subframe so that all terminals can receive it in common. The node-specific reference signal may be scrambled using different scrambling sequences for each network node, and each terminal receiving the node-specific reference signal may identify the network node that transmitted the node-specific reference signal using the scramble sequence. The terminal-specific reference signal is a reference signal set for each terminal in a connected state for providing a service. Accordingly, the U-LTE network node can transmit the setup information including the UE-specific reference signal to the UE through the dedicated control message in the connection establishment process of the UE. The U-LTE apparatus may measure the channel quality of the radio section using the node specific reference signal or the UE-specific reference signal and report the measurement result of the channel quality to the network node according to the measurement report setting condition in the connection setup control message . At this time, the report can be periodically transmitted through the physical layer control channel, such as a PUCCH channel quality indicator (CQI) or a PUCCH channel status indicator (CSI) of the LTE system.

In a U-LTE system, a network node can transmit an occupied reference signal, which indicates that the radio resource of a subframe or radio frame is occupied, using all or some of the subcarriers and specific symbols contained in the system bandwidth have. At this time, the occupancy reference signal can be a measure to overcome the compatibility problem because the network node (or the U-LTE device) of the U-LTE system can notify the other wireless device of the occupancy status of the radio resource. In one embodiment of the present invention, a U-LTE device or a wireless device detects whether there is a U-LTE device or a network node of a U-LTE system that detects an occupancy reference signal and occupies a subframe or a radio frame to transmit packet data It can be judged. Therefore, in the U-LTE system, when occupancy reference signal does not exist or occupancy of radio resources is allowed because the measurement value of occupancy reference signal is smaller than the reference value, packet data is transmitted using the corresponding radio resource . Or the U-LTE device can not access the radio resource or transmit packet data through the radio resource if the occupied reference signal is present or if the measured value of the occupied reference signal exceeds the reference value. At this time, a scramble sequence or a masking sequence is applied to the occupancy reference signal, so that information such as the attribute of the occupied U-LTE device, occupancy period (for example, the number of subframes or radio frames) can be expressed.

In a case where a network node of a U-LTE system according to an embodiment of the present invention divides radio resources into non-contention-based areas and contention-based areas and operates the network resources, And the occupation reference signal corresponding to the contention-free area can be transmitted. That is, the network node can maintain the radio resource setting for the contention-free area through transmission of the occupancy reference signal. Alternatively, the network node according to an embodiment of the present invention may notify that the radio resource is allocated for a predetermined time period through the scheduling information (or radio resource allocation information) indicating that the radio resource of the contention-based area is occupied. At this time, the allocation time of the radio resource can be set in a continuous or discrete manner through parameter setting.

6 is a diagram illustrating a radio frame of a U-LTE system according to another embodiment of the present invention.

In the resource allocation of the U-LTE system according to an embodiment of the present invention, a radio resource may be allocated to a U-LTE apparatus in a multiple of a preset minimum configuration unit. For example, the minimum configuration unit of a physical resource block (PRB) may be set to the number of subcarriers constituting the basic PRB 640. That is, when 12 subcarriers included in one subframe are set to the basic PRB 640, at least one U-LTE apparatus occupies a physical layer resource block configured by at least one base PRB 640, Data can be transmitted. At this time, if at least one U-LTE device in one subframe uses physical layer resources, the physical layer resources used in each U-LTE device should not collide or overlap. In an embodiment of the present invention, when the physical layer resources in a subframe are divided into basic PRBs 640, and when any U-LTE device occupies physical layer resources, a plurality of U- Collision can be avoided even if the radio resource of one subframe occupies radio resources.

Referring to FIG. 6, when a physical layer radio resource is scheduled in units of subframes, one subframe includes a physical layer control channel 630 through which physical layer control information is transmitted, and a physical layer control channel 630 for channel quality measurement, interference measurement, And a reference signal transmission region 680 for transmission of a signal or the like. The physical layer control channel 630 according to an embodiment of the present invention may be allocated on a symbol basis in a subframe or on a subcarrier basis. That is, when a physical layer control channel 630 is applied to downlink or uplink radio resources of a given U-LTE system (in the downlink / uplink subframe in the TDD scheme), the physical layer control channel 630, May be assigned to at least one symbol or may be assigned to at least one subframe.

Any subframe may include contention-based regions 610 and contention-based regions 620, such as the first subframe of FIG. 6, the basic PRB 640 includes at least one subcarrier and at least one symbol, and the number of subcarriers or symbols included in the basic PRB 640 may be a property of a service or a U- May be determined according to the capability of the LTE device. 6, the connection resources classified by the basic PRB 640 are divided into the connection resource 1 650, the connection resource 2 660, and the connection resource 3 670 in units of the basic PRB. . In one embodiment of the present invention, the case where the connection resources of the subframe are divided into three is explained, but the number of connection resources included in one subframe may be different. The resource classification information on the access resource (i.e., the physical layer radio resource) can be set according to the priority of the U-LTE device (or the U-LTE device group) and the priority for the service being provided. Also, the method of limiting the radio resource or the access resource according to the priority of the U-LTE device (or the U-LTE device group) and the priority of the service being provided can be set in units of subframes. That is, radio resources that can be used or occupied according to the set priorities can be divided into sub-frame units. For example, when one radio frame includes 10 subframes (index 0 to index 9), priority is assigned to the 0, 4, and 9 subframes, and 1, 2, 5, and 6 A priority of 2 is given to a subframe, and a priority of 3 is given to 3, 7 and 8 subframes. At this time, the U-LTE apparatus having the same priority is determined to use the same transmission time or radio resource, and the above-mentioned priorities can be utilized for the interference control of U-LTE apparatuses, collision probability, or adjustment of load conditions.

The radio resource configuration information (or the connection resource classification information) in units of the basic PRB 640 may be transmitted as system control information (or beacon) as a common control message or may be transmitted to the U-LTE apparatus Or a U-LTE device group). For the dynamic resource allocation, the radio resource allocation information according to the priority, the radio resource configuration information using the basic PRB 640, or the access resource division information is transmitted through a physical layer channel (for example, physical layer control channel or physical layer data transmission For each scheduling period or at a required time via the radio resources of the base station (e.g. The dynamic scheduling information may be transmitted in the previous subframe of the subframe to which the dynamic scheduling information is applied. For example, the scheduling information transmitted in the n < th > subframe is n + 1, n + 2, ... , n + (m-1), or n + mth subframe.

The U-LTE UE having received the control message including the configuration information of the radio resource or the information of the connection resource can transmit the packet data using physical layer resources that can be connected (or used) by itself.

According to another embodiment of the present invention, the connection resources included in the subframe may be classified according to a separate reference preset in the network node of the U-LTE system. In this case, the delimitation information of the connection resource may be transmitted to the U-LTE device through control signaling in which a common control message is transmitted as system information (or a beacon) or using a dedicated control message. If priority is set for the divided access resources, the priority mapping information can also be transmitted to the U-LTE device via control signaling or via a dedicated control message. For the efficiency of the control message configuration, the mapping information between the classified access resources and the priority is not transmitted, but is prioritized by using the list order (for example, descending order or ascending order) of control messages constituting the division information of connection resources Rankings may be expressed implicitly.

The U-LTE system according to an embodiment of the present invention may be configured such that the attributes of a service that can be transmitted by the U-LTE device, the size of packet data, An antenna setting method such as a modulation and coding level, a multiple input multiple output (MIMO), or a connectable physical layer resource block. The configuration parameter including the physical layer resource block that can be used when the U-LTE apparatus transmits packet data is determined based on the quality of the radio channel and transmitted to the U-LTE apparatus . ≪ / RTI > The U-LTE system can classify the quality of the radio channel into five levels and set the radio channel quality criteria for each step. For example, the U-LTE system can set the upper and lower limits of the radio channel quality rating index, such as RSRQ, which has a mapping relationship with each step of radio channel quality.

When there is a quality stage from the first stage (good) to the fifth stage (poor) with respect to the radio quality, if the radio channel quality estimated by any U-LTE device is 5 stages, Data may be transmitted in the smallest packet data size allowed by the U-LTE system (e.g., a size that can be transmitted in units of basic PRB). Also in this case, the U-LTE modulation and coding level may be allowed at the robust level that the system allows, or a particular modulation and coding level may be applied. Also, in terms of radio resources, transmission of packet data may be restricted to a physical layer resource region capable of transmitting only a basic PRB unit, or transmission of packet data may be limited to a specified physical layer resource region.

If the radio channel quality estimated by an arbitrary U-LTE device is one level, transmission of packet data for all kinds of services allowed in the system can be allowed without restriction on service attributes, The U-LTE device may select and transmit the packet data, or the size of the packet data to be transmitted may be maximally allowed. Also, the modulation and coding levels can be determined by the U-LTE apparatus.

That is, according to an embodiment of the present invention, a service attribute, a packet size, a modulation and coding level, a usable physical layer resource area, or a physical layer resource block size, an antenna setting A transmission mode (TM) applied to the physical layer of the LTE / LTE-A system, etc. may be parameterized and the network node of the U- It is possible to transmit the setup parameter information according to the radio channel quality to the U-LTE device so that the U-LTE device can perform the presetting or notify the U-LTE device whenever the setup parameter information is needed. The U-LTE apparatus that has received the information can determine the capability and the service attribute of the U-LTE apparatus and the modulation and coding levels to be applied to the packet data by using the setting parameter information.

The U-LTE apparatus according to an embodiment of the present invention may be used until the U-LTE apparatus transmits packet data so that the U-LTE apparatus can be utilized for load adjustment and collision avoidance between U-LTE apparatuses, The information such as the waiting time, the number of attempts, or the average waiting time can be transmitted together with the packet data. The network node of the U-LTE system according to an exemplary embodiment of the present invention allocates the waiting time, the number of attempts, or the average waiting time information collected from the U-LTE apparatus until the packet data is transmitted, Setting of a physical layer resource block according to a contention-based domain, setting of a contention-based domain or a contention-based domain. In addition, a plurality of network nodes of the U-LTE system can exchange information such as a setup parameter according to radio channel quality and a wait time collected in a U-LTE device, and adjust a load state between network nodes.

When the mobile communication BS is set as the primary node and the U-LTE node operating in the unlicensed frequency band is set as the secondary node, the mobile communication BS transmits resource allocation information for the U-LTE device, or the U- The scheduling information can be transmitted. In this case, the BS may perform scheduling or resource management so that collision or interference does not occur with respect to other U-LTE devices in consideration of the scheduling information received from the U-LTE device. In order to secure the transmission reliability of the radio section between the U-LTE devices using the frequency of the unlicensed band, the radio resources for communication between the U-LTE devices can be continuously allocated for an arbitrary interval or can be allocated discretely but repeatedly. When the radio resources are allocated continuously or discrete but repeatedly allocated for a certain interval, the receiving end can combine successively received packets or repeatedly received packets to increase the reception success rate of packet data. In a U-LTE system according to an embodiment of the present invention, when radio resources are allocated consecutively or a plurality of discrete radio resources are allocated, repeated transmission is instructed in the scheduling information, or it is repeated using the physical layer field By transmitting the indication information about whether or not to transmit, it is possible to improve the service quality and the system performance. For example, if the field indicating whether the scheduling information is repeatedly transmitted is 'repeated transmission' (for example, the control field is set to '1' if the control field is 1 bit), the U- The U-LTE apparatus can repeatedly transmit the same packet through the U-LTE apparatus, and if the field indicating repetitive transmission is not 'repeated transmission' (for example, if the control field is 1 bit, set to '0' Different packets can be transmitted through the indicated radio resources. If the U-LTE apparatus can selectively set an indicator for indicating whether it is repeatedly transmitted using the physical layer control field, the U-LTE apparatus, to which a plurality of radio resources are allocated in a temporally continuous or discrete manner through the scheduling information, Depending on the situation, it is possible to indicate whether it is repeatedly transmitted or not through an indicator, and the same packet data can be repeatedly transmitted at each transmission timing or different packet data can be transmitted according to the displayed information.

According to an exemplary embodiment of the present invention, ACK / NACK feedback information indicating successful reception of packet data may be used at each transmission timing, or ACK / NACK feedback information may be used to increase efficiency of resource utilization. According to an embodiment of the present invention, after transmitting packet data through radio resources allocated consecutively or discretely, the transmitting end, which receives the ACK notifying the successful reception from the receiving end, can stop the repeated transmission and reduce the power consumption. At this time, if the allocated radio resources remain, the transmitting terminal can transmit other data through the remaining radio resources or allocate the same to another U-LTE device, thereby improving the utilization of radio resources.

If ACK / NACK feedback is not used, the transmitter simply performs repetitive transmission because no radio resources are required for transmission of ACK / NACK feedback. In this case, it is not necessary to allocate radio resources for retransmission, and there is no need for a CS step for overcoming compatibility problems when acquiring retransmission radio resources.

In the U-LTE system according to another embodiment of the present invention, a retransmission scheme using ACK / NACK feedback of the physical layer such as a hybrid automatic repeat request (HARQ) may be applied. In order for HARQ retransmission to be applied to a U-LTE system using the unlicensed frequency, radio resource allocation for retransmission should also be considered. That is, in the mobile communication system using the applied frequency band, the radio resources for HARQ retransmission can be fixedly allocated or dynamically allocated if necessary, but the U-LTE system can not allocate ACK / NACK feedback information and retransmission data transmission It is difficult to allocate the radio resources for the mobile station to the mobile station.

For this, the LTE base station is set as the primary node, the U-LTE node of the unlicensed frequency band is set as the secondary node, and the LTE base station transmits the radio resource allocation information of the U-LTE. The ACK / NACK feedback information for the packet data transmitted through the U-LTE radio resource can be transmitted through the LTE radio resource. In this case, in one embodiment of the present invention, the reception failure of the packet data transmitted through the U-LTE radio resource is not recognized as the reception of the NACK feedback information, Lt; RTI ID = 0.0 > ACK / NACK < / RTI > feedback information). Further, in another embodiment of the present invention, the reception success of the packet data transmitted through the U-LTE radio resource is not recognized as the reception of the ACK feedback information, and when there is no NACK feedback information within a preset time, Can be perceived.

In the case of a reception failure, retransmission of packet data may be performed via LTE radio resources or U-LTE radio resources. In the case of retransmitting the packet data transmitted through the U-LTE radio resource, if a radio resource is not fixedly allocated and a reception failure is recognized, a certain time interval (for example, a retransmission time window) Retransmission can be performed. At this time, the time interval for retransmission may mean the time until the timer set in the retransmission time interval is terminated after recognizing the necessity of retransmission through ACK / NACK feedback. That is, if the reception of the packet data transmitted through the U-LTE radio resource fails and it is recognized that the retransmission is necessary, a radio resource for retransmission of the packet data is allocated before the timer set in the retransmission time interval is terminated, do. At this time, if a reception failure also occurs in the retransmitted packet data, the retransmission can be performed again according to the retransmission parameter and the retransmission procedure. In this case, the maximum number of retransmissions is set for the U-LTE system to limit the number of retransmissions and the time interval for the maximum retransmission can be set separately. Alternatively, if the timer for the maximum retransmission is terminated, retransmission may not be performed even if the number of retransmissions has not reached the maximum number of retransmissions.

Hereinafter, retransmission when scheduling for downlink transmission from a secondary node (U-LTE node or the like) to a U-LTE device is included in scheduling information for a primary node (LTE base station, etc.) will be described.

First, for initial transmission, the primary node transmits scheduling information on downlink radio resources of the U-LTE device to the U-LTE device. At this time, the scheduling information may also include uplink scheduling information.

The U-LTE node transmits packet data to the U-LTE device according to the scheduling information received from the primary node. At this time, the master node may notify the U-LTE node of the scheduling information for the U-LTE device before the time of transmission of the packet data, or notify the U-LTE node according to the transmission time of the packet data.

The U-LTE device receives the packet data transmitted through the downlink radio resource of the U-LTE system in the U-LTE node, and the U-LTE device transmits ACK or NACK feedback to the U-LTE node . At this time, the ACK / NACK feedback information may be transmitted through the U-LTE uplink radio resource or the LTE uplink radio resource. When the U-LTE device transmits feedback indicating the reception failure, a timer related to the time interval set for retransmission is started, and a counter value for the maximum number of retransmission can be set.

In an embodiment of the present invention, when ACK / NACK feedback is transmitted through an LTE radio resource, a radio resource for uplink control information transmission mapping with a downlink radio resource in which scheduling information of a U-LTE apparatus is transmitted is used Or a radio resource set for the control message dedicated to support the auxiliary node (U-LTE node) in the uplink of the LTE system may be used.

In another embodiment of the present invention, when ACK / NACK feedback is transmitted through a U-LTE radio resource, a radio resource (for example, ACK / NACK feedback or packet of a U-LTE system described in the scheduling information transmitted by the primary node Uplink radio resource for transmission of data) may be used.

Then, the U-LTE node which receives the ACK / NACK feedback from the U-LTE device or waits to receive the ACK / NACK feedback starts the retransmission procedure when it recognizes the reception failure. At this time, a timer set for retransmission is started and a counter value can be set.

The primary node (LTE node) transmits scheduling information including U-LTE radio resource information for retransmission to the secondary node (U-LTE node) in the retransmission time window, and the U-LTE node transmits the scheduling information Retransmits the data to the U-LTE device. At this time, the scheduling information for the radio resources of the U-LTE system may be notified to the U-LTE node and the U-LTE device at the primary node, and the U-LTE node may transmit the scheduling information The packet data can be retransmitted.

Then, the U-LTE apparatus receives the retransmission packet transmitted through the U-LTE downlink radio resource according to the scheduling information. The retransmission procedure described above can be repeated until the maximum number of retransmissions is reached, or until the timer set for the maximum retransmission time period expires.

Hereinafter, retransmission when scheduling information is transmitted from an auxiliary node (e.g., a U-LTE node) according to another embodiment of the present invention, and the auxiliary node transmits packet data to the U-LTE device will be described.

First, for initial transmission, the U-LTE node transmits scheduling information on the downlink radio resources of the U-LTE system to the U-LTE device. At this time, the scheduling information may also include uplink scheduling information. Then, the U-LTE node transmits packet data according to the scheduling information. At this time, the U-LTE node can transmit the packet data together with the scheduling information.

The U-LTE apparatus can receive the packet data transmitted from the U-LTE node through the U-LTE downlink radio resource and transmit the ACK / NACK feedback information to the U-LTE uplink radio resource. The U-LTE device starts a timer for a time interval set for retransmission in case of a reception failure, and sets a counter value.

In another embodiment of the present invention, the ACK / NACK feedback may be transmitted via the U-LTE radio resource included in the scheduling information transmitted from the U-LTE node.

In another exemplary embodiment of the present invention, the ACK / NACK feedback may include uplink radio resources acquired by a U-LTE device on a contention basis such as a random access procedure, uplink radio resources acquired using radio resources established for resource requests, Or may be transmitted using radio resources set separately for ACK / NACK feedback.

When the U-LTE node recognizes the reception failure of the U-LTE device, it starts the retransmission process of the packet data. At this time, a timer set for retransmission is started, and the number of retransmissions can be counted.

The U-LTE node transmits scheduling information including U-LTE radio resource information for retransmission in the retransmission time window, and the U-LTE node retransmits the packet data through the scheduled radio resource. At this time, the scheduling information and packet data transmission of the U-LTE node can be performed according to the method described above.

The U-LTE apparatus receives the retransmitted packet data through the U-LTE downlink radio resource according to the received scheduling information. Retransmission of the packet data can be repeated until the maximum number of retransmissions is reached or until the timer of the maximum retransmission time interval expires.

Hereinafter, retransmission when a primary node schedules radio resources of a U-LTE system according to another embodiment of the present invention and a U-LTE apparatus performs uplink transmission to a U-LTE node will be described.

For initial transmission, the primary node transmits scheduling information for uplink radio resources of the U-LTE system. The U-LTE device transmits packet data to the U-LTE node through the uplink radio resource of the scheduling information received from the primary node. At this time, the uplink scheduling information for the U-LTE apparatus can also be transferred from the primary node to the U-LTE node.

The U-LTE node that received the packet data transmitted by the U-LTE device can transmit ACK / NACK feedback to the U-LTE device. At this time, the ACK / NACK feedback can be transmitted through the downlink radio resource of the LTE system or the U-LTE system. If the U-LTE device fails to receive the packet data, the U-LTE device starts the timer of the set time interval for retransmission and sets the counter value. In addition, scheduling information of uplink radio resources of the U-LTE system for retransmission may be transmitted together with ACK / NACK feedback. At this time, ACK / NACK feedback and uplink radio resource scheduling information may be configured as separate messages.

In an embodiment of the present invention, when a U-LTE node transmits ACK / NACK feedback to a U-LTE device using downlink radio resources of the LTE system, the U-LTE node transmits A physical hybrid ARQ indicator channel (PHICH), a radio resource for downlink control information transmission mapping with an uplink radio resource included in the scheduling information transmitted by the LTE node, The ACK / NACK feedback can be transmitted through the radio resource set for the control message dedicated for supporting the auxiliary node in the downlink.

In another embodiment of the present invention, when the U-LTE node transmits ACK / NACK feedback to the U-LTE device using the radio resources of the U-LTE system, the U-LTE node transmits the scheduling information A U-LTE downlink control channel having a mapping relationship with an uplink radio resource included in the U-LTE downlink, a U-LTE downlink channel for downlink radio resource or packet data transmission separately provided for ACK / NACK feedback transmission in a U- ACK / NACK feedback can be transmitted through the radio resource.

Upon receiving the ACK / NACK feedback from the U-LTE node, the U-LTE apparatus starts retransmission when recognizing the failure to receive the packet data. At this time, the U-LTE apparatus can start a timer set for retransmission and set a counter value. If the scheduling information of the U-LTE uplink radio resource for retransmission is not transmitted together with the ACK / NACK feedback, the LTE node transmits the scheduling information for the U-LTE uplink radio resource for retransmission in the retransmission time window to the U- LTE device, and the U-LTE device can retransmit the packet data through the uplink radio resource according to the received scheduling information.

Then, the U-LTE node receives the packet data retransmitted by the U-LTE device. The retransmission of the packet data can be repeated until the number of retransmissions reaches the maximum number of retransmissions or until the timer set for the maximum retransmission time period expires.

Hereinafter, a description will be given of retransmission when an auxiliary node transmits scheduling information on a radio resource of a U-LTE system according to another embodiment of the present invention and the U-LTE apparatus performs uplink transmission to a U-LTE node do.

For initial transmission, the secondary node transmits scheduling information for the uplink radio resource of the U-LTE system. At this time, the scheduling information may also include downlink scheduling information. The U-LTE apparatus transmits packet data to the U-LTE node based on the uplink radio resource of the scheduling information received from the auxiliary node.

The U-LTE node may then receive packet data from the U-LTE device and send ACK / NACK feedback to the U-LTE device. If packet data fails to receive, the U-LTE node starts a timer associated with the time interval set for retransmission and sets the counter value. At this time, in addition to the ACK / NACK transmitted from the U-LTE node to the U-LTE device, the scheduling information for the U-LTE uplink radio resource for retransmission may also be transmitted to the U-LTE device. However, the ACK / NACK feedback information and the U-LTE uplink radio resource scheduling information may be configured as separate messages.

Meanwhile, the U-LTE node can transmit ACK / NACK feedback using U-LTE radio resources. At this time, the U-LTE node includes a U-LTE downlink control channel having a mapping relationship with the U-LTE uplink radio resource, a downlink radio resource separately provided for ACK / NACK feedback transmission in the U- Or ACK / NACK feedback over the U-LTE downlink radio resource for packet data transmission.

Upon receiving the ACK / NACK feedback from the U-LTE node, the U-LTE apparatus starts retransmission when recognizing the failure to receive the packet data. At this time, the U-LTE apparatus can start a timer set for retransmission and set a count value. If the scheduling information of the U-LTE UL radio resource for retransmission is not transmitted together with the ACK / NACK feedback, the U-LTE node transmits the scheduling information for the U-LTE UL radio resource for retransmission in the retransmission time window To the U-LTE device, and the U-LTE device can retransmit the packet data through the uplink radio resource according to the received scheduling information.

Then, the U-LTE node receives the packet data retransmitted by the U-LTE device. The retransmission of packet data may be repeated until the number of retransmissions reaches the maximum number of retransmissions or until the timer set for the maximum retransmission time period is terminated.

In a U-LTE system according to an embodiment of the present invention, consideration of a backoff operation is required in an access procedure for attempting to occupy or request radio resources. The back-off operation is an operation required to reduce a collision between U-LTE devices when a plurality of U-LTE devices perform a connection procedure for radio resources. For example, when an arbitrary random number is generated in a window in which a backoff value is set, and a timer set based on the generated random number ends, one U-LTE device can perform a connection procedure for a radio resource. Therefore, a large backoff value can lower the collision probability of the U-LTE device, but the delay of the connection procedure may increase. Conversely, a small backoff value may reduce the delay of the connection procedure, but the collision probability of the U-LTE device may increase.

The U-LTE system according to an embodiment of the present invention can increase the capacity of the U-LTE node according to the number of connection attempts of the U-LTE device with respect to the U-LTE node, By setting the backoff value according to the state, the backoff operation can be variably operated.

For example, when the backoff value is set according to the quality of the radio channel or the strength of the received signal, if the quality of the radio channel is good, the backoff value may be set to the minimum value or a connection to the radio resource may be performed without backoff . And, if the radio channel quality is poor, the backoff value can be set to a relatively large value, and a connection to the radio resource can be attempted after the backoff counter ends. However, in this case, a fairness problem may arise because only a U-LTE device with a good wireless channel can monopolize radio resources.

In the U-LTE system according to another embodiment of the present invention, the backoff value can be varied according to the quality of the radio channel or the strength of the received signal and the occupation attribute of the uplink resource. That is, even if the quality of the radio channel is good, the service attribute and the like are additionally considered, and the access right to the radio resource can be granted. For example, if the quality of the wireless channel is good and continuous occupancy is allowed, after the U-LTE device is notified of the allowance through the scheduling information, the backoff value is set to the minimum value or the connection procedure is operated without backoff . However, even if the quality of the radio channel is good, a relatively large value of the backoff value can be set if the continuous occupation of a specific U-LTE device is not allowed according to the service attribute, and the U- And may attempt to connect to the radio resource after the termination.

In the U-LTE system according to another embodiment of the present invention, the backoff value can be variably set according to the number of connection attempts of the U-LTE device to the U-LTE node or the load state of the U-LTE node. That is, if the number of connection attempts of the U-LTE device is large or the load of the U-LTE node is high, a relatively large backoff value is set and the number of connection attempts of the U-LTE device is small, If the load is low, a relatively small backoff value can be set. At this time, the reference value for the number of access attempts and the load state can be set separately, and the U-LTE node can set the backoff value according to each reference value. The set backoff value may be delivered to the U-LTE device in the form of system information, a separate common control message, a dedicated control message, or a MAC layer control message. The variable setting method of the backoff value described above can be selectively combined with each other, and backoff may not be applied when control information or packet data is transmitted instead of a connection to a radio resource.

In an embodiment of the present invention, the quality of a wireless channel (or received signal strength), service attributes (such as QoS or QCI), terminal capabilities, capabilities of a U-LTE node, The backoff information (or the backoff list) may be transmitted through the system information, the RRC control message, or the control message of the MAC layer, or may be transmitted through the dedicated control message Lt; / RTI > At this time, the backoff information is graded on the basis of the quality of the radio channel, the service attribute, the terminal capability, the capacity of the U-LTE node, the number of connection attempts, or the load status of the U-LTE node, The backoff value corresponding to the rating can be applied. Thereafter, in the U-LTE system, the U-LTE node or the U-LTE node attempting to occupy radio resources can perform connection to the radio resource after confirming the backoff information.

According to one embodiment of the present invention, when a service is provided through a U-LTE node, the mobile state of the terminal can be considered. For example, when the UE moves at a high speed, a service is provided through the LTE system. When the UE moves at a low speed or stationary, a service can be provided through the U-LTE node. To this end, a 'mobile condition condition' of a UE capable of receiving service through a U-LTE node may be defined, and the defined mobile condition condition may be notified to the UE in the form of system information or a dedicated control message.

In one embodiment of the present invention, the mobile condition condition of the mobile station can be classified into five stages in which the mobile station moves most slowly in the fastest mobile station. The UE may be provided with a service from the U-LTE node if the fourth step is set as a reference value of the movement state condition, and the movement state of the UE is the fourth or fifth step of the movement state condition. In this case, the step 5 may indicate the stationary state of the terminal or may be separately set to indicate the stationary state of the terminal. A UE according to an exemplary embodiment of the present invention measures its movement state and may transmit control information for reporting its movement state to an LTE node or a U-LTE node when the UE measures its movement state at low speed or does not move . At this time, the control information reporting the 'non-moving state' of the UE can be transmitted as a MAC control message or a control message of the RRC layer.

The mobile state of the mobile station can be measured using the speed of the mobile station, the degree of state change of the radio channel quality, or the intensity of the interference signal. In the U-LTE system according to an embodiment of the present invention, the LTE node or the U-LTE node may receive a report on the movement state measured by the terminal itself from the terminal, By estimating the state, the moving state of the terminal can be known. Then, it can be determined whether or not the specific terminal can access the U-LTE node and receive the service through the determination as to whether the movement state of the terminal conforms to the movement state condition. That is, the U-LTE node or the like can provide the UE with a service through the U-LTE node when the mobile state of the UE meets the moving condition.

In one embodiment of the present invention, the network node may be in the form of a base station, a cell, an AP, or a new AP performing an end function of the wireless network. In the structure of the radio frame according to the embodiment of the present invention described with reference to FIGS. 5 and 6, subcarriers such as contention-based regions, contention-based regions or access resources are continuous, The subcarriers of the physical layer resource block may be allocated consecutively or discretely.

7 is a diagram illustrating a wireless network according to another embodiment of the present invention.

(E. G., Offloading or service continuity functions) and concurrent services (e. G., Multiple connection functions or RRAs) between a U-LTE node or WLAN node and a base station Etc.) method can be applied to all wireless access devices operating at unlicensed band frequencies. For example, the RRA can provide a service to an arbitrary subscriber device by using radio resources of each system together through signaling between a U-LTE node or a WLAN node and a macro base station.

The RRA may be efficient if the U-LTE node or the WLAN node and the macro base station are co-located. A U-LTE node or a WLAN node, and a macro base station may be more efficient when divided into a macro node RU responsible for analog signal processing including an RF function and a macro node DU responsible for digital signal processing including a baseband function. When the U-LTE node or the WLAN node is at the same position as the macro base station, or when the macro node RU and the U-LTE node or the WLAN node are at the same position, the signal strength of the U- Lt; / RTI > Thus, without reporting on the signal strength of the U-LTE node or the WLAN node, the RRA can be triggered.

7, the macro base station 710 is connected to the macro node DU 711 and the macro nodes RU 712 and 713, and the macro node DU 711 can be installed in the same position as the macro base station 710 And the macro nodes RU 712 and 713 may be installed at a position different from the macro base station 710 (one point in the service area of the macro base station). The macro base station 710 may be located with the macro node DU 711, the RU of the WLAN AP, and the RU of the new AP. In addition, a WLAN AP 730 or a small base station 720 in which the DU and the RU are combined may be located in the service area of the macro base station 710. The macro node RUs 712 and 713 may be located with the RU 731 of the WLAN AP or the RU 741 of the new AP.

7, the macro node DU 711 connected to the macro base station 710 is provided with a macro DU function for digital signal processing corresponding to the macro nodes RU 712 and 713 and a macro DU function corresponding to the RU 731 of the WLAN AP The DU function of the WLAN AP responsible for the digital signal processing and the DU function of the U-LTE node responsible for the digital signal processing corresponding to the RU 741 of the new AP. That is, the macro node DU 711 performs the DU function corresponding to each system in accordance with the system type of the RU connected to the macro node DU 711 (i.e., the mobile communication system, the WLAN system, or the U- Can be performed.

The small base station 720 is connected to the small node DU 721 and the small node RU 722. The small node DU 721 is connected to the small base station 720. The small node RU 722 is small And may be installed at a different location from the base station 720. 7, the DU / RU interface 715 connecting the macro node DU 711 with the macro node RUs 712 and 713 and the small node DU 721 and the small node RU 722 may be a wired or wireless network, It can be configured wirelessly.

8 is a diagram illustrating a protocol stack of a U-LTE system according to an embodiment of the present invention.

8, the packet data is transmitted through a bearer, and the transmitting node DU 800 ₁ and the transmitting node RU 800 ₂ transmit the LTE system, the WLAN system, and the U-LTE System can be supported. At this time, the macro node DU or the small node DU shown in FIG. 7 may be the transmitting node DU 800 ₁ or the receiving node DU 800 ₃ shown in FIG. The macro node RU or the small node RU shown in FIG. 7 may be an LTE RU included in the transmitting node RU 800 ₂ and an LTE RU included in the receiving node RU 800 ₄ in FIG. The WLAN AP RU shown in FIG. 7 may be a WLAN RU included in the transmitting node RU 800 ₂ of FIG. 8 and a WLAN RU included in the receiving node RU 800 ₄ , The new AP RU may correspond to the U-LTE RU included in the transmitting node RU 800 ₂ in FIG. 8 and the U-LTE RU included in the receiving node RU 800 ₄ . Therefore, the existence of the mobile communication base station, the WLAN AP and the U-LTE node in the same location means that the DU and the RU of the WLAN AP DU and the RU or U-LTE node are in the same position, Or the RU of the U-LTE node exists at the same position.

In a transmission apparatus according to an embodiment of the present invention, a service data unit (SDU) of an arbitrary protocol layer means packet data packet data transmitted from an upper layer. The packet data unit (PDU) also includes packet data packet data (at least one SDU or segmented SDU) transmitted from an upper layer and header information or control information specific to any wireless protocol layer . That is, an arbitrary radio protocol layer attaches header information or control information specific to an arbitrary radio protocol layer to packet data of an upper layer, generates a PDU, and transmits the generated PDU to a lower radio protocol layer. At this time, the header information or the control information may include a sequence number (SN), a data / control field (D / C) field, segmentation information, or a channel identifier.

A receiving apparatus according to an embodiment of the present invention may extract the SDU by separating the hair information or the control information from the PDU received from the lower radio protocol layer of the transmitting apparatus and form packet data from the SDU and transmit it to the upper layer .

For example, the MAC PDU in the MAC layer includes a MAC header, a MAC SDU (greater than zero), a MAC control element (greater than zero), or padding information . The MAC SDU and the MAC header are of variable size, and the MAC SDU is byte unit, and can be sequentially included in the MAC PDU from the first bit.

In addition, an RLC SDU or a segmented RLC SDU is mapped to a data field of an RLC PDU in a radio link control (RLC) layer. The RLC layer does not add a header according to a transmission mode (transparent mode, TM, unacknowledged mode, acknowledge mode, AM), or adds a header of another format, . In the case of TM, the RLC constructs an RLC PDU with one SDU without adding a header. In the case of UM, the RLC constructs an RLC PDU by adding a header in which fields such as framing information (FI), length indicator (LI), SN, extension (E) In the case of AM, the RLC includes data / control (D / C), re-segmentation flag (RF), polling bit (P), FI, SN, last segment The RLC PDU is constructed by adding a header in which fields such as a flag, an LSF, a segment offset (SO), and an LI are selectively combined. In case of AM, the RLC layer of the receiving apparatus can perform the ARQ function to perform retransmission of the RLC PDU by transmitting the SN information of the received RLC PDU to the transmitting apparatus. After the retransmission of the RLC PDU using the ARQ, the RLC of the receiving apparatus transmits the D / C, the control PDU type, the CPT, the ACK_SN, the NACK_SN, the SO start and the SO end, SOend) can be used to transmit the STATUS PDU for the retransmitted RLC PDU to the transmitting apparatus. At this time, whether or not the retransmitted RLC PDU is successfully received can be notified via the STATUS PDU. Thereafter, the RLC layer of the transmitting apparatus recognizes the RLC PDUs not received even after the retransmission using the STATUS PDU received from the receiving apparatus, and can perform retransmission again.

The transmitting node DU 800 ₁ includes a plurality of blocks responsible for digital signal processing of the LTE system, the WLAN system, and the U-LTE system using the frequencies of the unlicensed band. The packet data convergence protocol (PDCP) layer 810 of the transmitting node DU 800 ₁ transmits the packet data of any bearer received from the upper layer to the lower layer protocol layer of the system participating in the RRA, 811, WLAN RLC 821, or U-LTE RLC 831 layer. At this time, the base station determines the transmission path of the packet data to one of the LTE transmission path, the WLAN transmission path, and the U-LTE transmission path, and the PDCP layer 810 transfers the packet data to the determined transmission path. Accordingly, the scheduler of the base station determines the transmission path of packet data belonging to an arbitrary bearer. When the PDCP layer 810 allocates the LTE radio resources, the PDCP layer 810 transfers the packet data to the LTE RLC layer 811, When the U-LTE radio resource is allocated, the U-LTE RLC layer 821 transfers the packet data to the WLAN RLC layer 821. When the U-LTE radio resource is allocated,

The packet data is transmitted from the LTE RLC layer 811 to the LTE MAC layer 812 to the LTE PHY 810 in the transmitting node DU 800 ₁ when the packet data received via the PDCP 810 is transmitted through the LTE transmission path. Layer 813 in order. The LTE RLC layer 811 may perform a retransmission function for the RLC SDU and may forward the packet data to the LTE MAC layer 812 according to the order received from the PDCP 810. The LTE MAC layer 812 can perform an HARQ function and perform a processing function for a transport channel to transmit packet data to the LTE PHY layer 813. The LTE PHY layer 813 can perform digital signal processing of a physical layer including coding or modulation for a MAC PDU (or a transport block (TrBK)) received from the LTE MAC layer 812.

When the packet data received via the PDCP 810 is transmitted over the WLAN transmission path, the packet data is transmitted from the transmitting node DU 800 ₁ to the convergence functional layer 821 -> WLAN MAC layer 822 -> WLAN PHY Layer 823 in that order. That is, the transmitting node DU 800 ₁ according to an embodiment of the present invention includes a convergence function block 821 for interfacing between the LTE-based PDCP layer 810 and the WLAN MAC layer 822 on the WLAN transmission path . At this time, the convergence function block 821 can convert the PDCP PDU of the LTE system to the MAC SDU of the WLAN system. That is, the convergence function block 821 receives the packet data from the PDCP 810, converts the packet data to conform to the protocol structure of the WLAN system, and transmits the packet data to the WLAN MAC layer 822. For example, the convergence function block 821 may map a PDCP PDU to a data field according to the frame format of the WLAN MAC layer 822 and apply the PDCP PDU mapped to the data field in the MAC layer 822 of the WLAN system You can add header information.

The WLAN MAC layer 822 may perform the WLAN MAC function to forward the packet data to the WLAN PHY layer 823. The WLAN PHY layer 823 may perform digital signal processing at the physical layer of a WLAN system including coding or modulation.

If the packet data received through the PDCP layer 810 is transmitted through the U-LTE transmission path, the packet data from the sending node DU (800 _1), U-LTE RLC layer (831) -> U-LTE MAC layer (832) - > U-LTE PHY layer (833). The U-LTE RLC layer 831 may configure the transmitted PDCP PDUs as RLC PDUs and forward the RLC PDUs to the U-LTE MAC layer 832. However, in the U-LTE transmission path, the U-LTE RLC layer 831 may be omitted, in which case the packet data may be transferred directly to the U-LTE MAC layer 832 in the PDCP layer 810. The U-LTE MAC layer 832 may perform a processing function for a transport channel to forward packet data to the U-LTE PHY layer 833. The U-LTE PHY layer 833 can perform digital signal processing of the physical layer including the encoding or modulation process on the MAC PDU (or TrBK) received from the U-LTE MAC layer 832, have.

The transmitting node DU 800 ₁ according to an embodiment of the present invention can use one memory buffer for packet data of one bearer. Each layer included in the transmitting node DU 800 ₁ can perform signal processing on the packet data using the address of the memory buffer and does not actually read or write data in the memory buffer . Therefore, in each layer of the transmitting node DU (800 ₁ ) u, the transmission of the packet data in which signal processing is completed can be replaced by a process in which the address information of the memory buffer allocated for the bearer including the packet data is transmitted. At this time, when the transmitting node DU 800 ₁ completes the digital signal processing on the packet data and transfers it to the transmitting node RU 800 ₂ , the transmitting node DU 800 ₁ reads the data of the memory buffer, It is possible to write the read data to the memory buffer allocated for the interface between the transmitting node 800 ₁ and the transmitting node RU 800 ₂ .

When the transmitting node DU 800 ₁ completes the digital signal processing for the packet data, the encoded or modulated data signal sequence may be transmitted to the RU functional block included in the transmitting node RU 800 ₂ . The data signal sequence transmitted over the LTE transmission path can be transferred from the LTE PHY layer 813 of the transmitting node DU 800 _{1 to} the LTE RU function block 814 of the transmitting node RU 800 ₂ . The data signal sequence transmitted over the WLAN transmission path may be transferred from the WLAN PHY layer 823 of the transmitting node DU 800 _{1 to} the WLAN RU functional block 824 of the transmitting node RU 800 ₂ . The data signal sequence transmitted over the U-LTE transmission path is transferred from the U-LTE PHY layer 833 of the transmitting node DU 800 _{1 to} the U-LTE RU function block 834 of the transmitting node RU 800 ₂ . The LTE RU functional block 814, the WLAN RU functional block 824 and the U-LTE RU functional block 834 included in the transmitting node RU 800 ₂ receive from the PHY layer of the transmitting node DU 800 ₁ It is possible to perform the analog signal processing and the RF function required by the U-LTE system and transmit the data signal sequence to the radio section.

The PDCP layer 810 of the transmitting node DU 800 ₁ may forward PDCP PDUs to the LTE RLC layer 811 or to the convergence layer 821 in the case of the RRA of the LTE system and the WLAN system have. PDCP PDUs of the PDCP layer 810 may be delivered to the WLAN MAC layer 822 if the convergence function block 821 is not introduced at the transmitting node DU 800 ₁ . That is, packet data of the same bearer can be delivered to an LTE system or a WLAN system. If there is no retransmission function for the PDCP PDU in the WLAN system or retransmission through the WLAN system fails, the PDCP PDU can be retransmitted through the LTE system, so that the quality of service can be satisfied.

On the other hand, the receiving apparatus can receive packet data constituting an arbitrary bearer through the RRA. That is, the receiving apparatus can receive the packet data through the LTE receiving path, the WLAN receiving path, or the U-LTE receiving path depending on the type of system in which the RRA is supported.

The RU functional blocks for each system included in the receiving node RU 800 ₄ perform RF signal processing for each system to generate a data signal train and generate a data signal train for each system included in the receiving node DU 800 ₃ The data signal sequence can then be transferred to the PHY functional block.

When the data signal sequence is received via the LTE receive path, the LTE RU 815 may forward the data signal sequence for which the RF signal processing has been completed to the LTE PHY layer 816 of the receiving node DU 800 ₃ . The LTE PHY layer 816 generates a TrBK in a data signal sequence through a demodulation or a decoding process, and the TrBK is transmitted to the LTE MAC layer 817. The LTE MAC layer 817 may generate a MAC SDU via the TrBK received from the LTE PHY layer 816 and forward the generated MAC SDU to the LTE RLC layer 818. The LTE RLC layer 818 receiving the RLC PDU generates an RLC SDU through header information such as logical channel identifier (LCID), SN, FI or LI, and transmits the RLC SDU to the PDCP layer 840 . At this time, the LTE RLC layer 818 can generate RLC SDUs by aligning the packet data according to the SN order using header information such as an SN and RLC status information for supporting an ARQ function . That is, the LTE RLC layer 818 may generate an RLC SDU by in-sequence the order of packet data using the SN, and may transmit the RLC SDU to the PDCP layer 840.

When the data signal sequence is received via the WLAN receive path, the WLAN RU 825 may forward the data signal sequence for which the RF signal processing has been completed to the WLAN PHY layer 826. The WLAN PHY layer 826 receiving the data signal sequence performs physical layer digital signal processing of the WLAN system including the demodulation or decoding to transfer the packet data to the WLAN MAC layer 827. The WLAN MAC layer 827 performs the WLAN MAC function and forwards the packet data to the PDCP 840. The receiving node DU 800 ₃ according to an embodiment of the present invention may include a convergence function block 828 for interfacing between the LTE based PDCP layer 840 and the WLAN MAC layer 827. The convergence function block 828 may convert the MAC SDUs of the WLAN system to PDCP PDUs of the PDCP layer 840 of the LTE system. That is, the convergence function block 828 receiving the MAC SDU packet data from the WLAN MAC layer 827 converts the MAC SDU into the PDCP PDU according to the structure of the PDCP PDU of the PDCP layer 840 of the LTE system, PDU layer 840 to the PDCP layer 840. [

When the data signal sequence is received via the U-LTE receive path, the U-LTE RU 835 can deliver the data signal sequence completing the RF signal processing to the U-LTE PHY layer 836. The U-LTE PHY layer 836 may demodulate or decode the received data signal sequence to generate a TrBK and deliver the generated TrBK to the U-LTE MAC layer 837. The U-LTE MAC layer 837 may generate a MAC SDU based on the TrBK received from the U-LTE PHY layer 836 and forward the MAC SDU to the U-LTE RLC layer 838. The U-LTE RLC layer 838 may generate an RLC SDU by arranging the order of packet data on the received RLC PDU, and may transmit the generated RLC SDU to the PDCP layer 840. That is, the U-LTE RLC layer 838 can align the order of the packet data using the SN and can forward the RLC SDU to the PDCP layer 840. If a radio protocol is configured without the U-LTE RLC layer 831 in the U-LTE transmission path, a reception path may be formed without the U-LTE RLC layer 838 in the U-LTE reception path. In this case, Packet data may be delivered directly from the MAC layer 837 to the PDCP layer 840. In this case, the in-sequence of the packet data may be performed in the U-LTE MAC layer 837 or in the PDCP layer 840 through re-ordering.

The PDCP layer 840 can forward the packet data transmitted through each path participating in RRA support, such as an LTE reception path, a WLAN reception path, or a U-LTE reception path, to an upper layer through the same bearer.

9 is a diagram illustrating a protocol stack of a U-LTE system according to another embodiment of the present invention.

9, the packet data is transmitted through the bearer, and the transmitting node DU 900 ₁ and the transmitting node RU 900 ₂ support the LTE system, the WLAN system, and the U-LTE system using the frequencies of the unlicensed band . In the U-LTE system according to another embodiment of the present invention shown in FIG. 9, the RRA function can be partially supported also in the LTE RLC layer. For example, when the RRA is applied to the radio resources of the LTE system and the WLAN system, the LTE RLC layer delivers packet data to the WLAN MAC layer. That is, by scheduling that the base station performs transmission of the packet data, it is determined whether the packet data is going through the LTE transmission path or the WLAN transmission path, and is transmitted to the LTE transmission path according to the determination of the scheduler of the LTE RLC layer Packet data may be delivered to the LTE MAC layer and packet data to be forwarded to the WLAN transmission path may be delivered to the WLAN transmission path.

Packet data of any bearer is transferred from the PDCP layer 910 to the LTE RLC layer 911 or the U-LTE RLC 931 layer at the transmitting node DU 900 ₁ . When packet data is transmitted over the LTE transmission path, the packet data may be delivered in the order of the LTE RLC layer 911 -> LTE MAC layer 912 -> LTE PHY layer 913 at the transmitting node DU 900 ₁ have. The LTE RU 914 of the transmitting node RU 900 ₂ receiving the data signal sequence from the LTE PHY layer 913 performs an RF function and analog signal processing for the LTE system and transmits the data signal sequence.

When the packet data is transmitted through the WLAN transmission path, the LTE RLC layer 911 of the transmitting node DU 900 ₁ forwards the RLC PDU to the WLAN MAC layer 922. At this time, the LTE RLC layer 911 allocates a separate logical channel identifier and indicates it in the LTE RLC header, so that the transmitting LTE RLC or the receiving LTE RLC layer determines whether the RLC PDU is delivered through the LTE system or through the WLAN system Can be distinguished. The WLAN MAC layer 922 maps the RCL PDU received from the LTE RLC layer 911 to the data field according to the frame format of the WLAN MAC layer 922 and transmits the header Information to the WLAN PHY layer 923 after adding it to the RLC PDU. The WLAN PHY layer 923 performs digital signal processing of the physical layer of the WLAN system including the encoding or modulation defined in the WLAN system. The WLAN PHY layer 923 then forwards the data sequence to the WLAN RU 924 of the transmitting node RU 900 ₂ . The WLAN RU 924 performs analog signal processing, RF function, and the like to transmit signals.

In the transmitting node DU 900 ₁ according to another embodiment of the present invention, a convergence function block 921 may be introduced for an interface between the LTE-based LTE RLC layer 911 and the WLAN MAC layer 922. The convergence function block 921 may convert the RLC PDUs of the LTE system according to the MAC SDU structure of the WLAN system. The convergence function block 921 may receive the packet data from the LTE RLC layer 911 and convert the received packet data to conform to the WLAN protocol structure and transmit the packet data to the WLAN MAC layer 922.

If the packet data is transmitted through the U-LTE transmission path, the packet data is transmitted from the transmitting node DU 900 ₁ to the PDCP 910, the U-LTE RLC 931, the U-LTE MAC 932, -LTE PHY (933) Can be passed in hierarchical order. The U-LTE RLC layer 931 constructs an RLC PDU using the received PDCP PDU and delivers the configured RLC PDU to the U-LTE MAC layer 932. If the wireless protocol is configured without the U-LTE RLC layer 931 in the U-LTE transmission path, the packet data is delivered directly from the PDCP layer 910 to the U-LTE MAC layer 932, To the LTE RLC layer 911 and to the LTE RLC layer 911 to the U-LTE MAC layer 932. If the U-LTE radio protocol is defined without the U-LTE RLC layer 931 and the RRA function using the LTE system and the U-LTE system is supported, the PDCP layer 910 transmits the MAC The LTE RLC layer 911 delivers the PDCP PDU according to the data area of the MAC PDU of the U-LTE MAC layer 932. [ The U-LTE MAC layer 932 performs a processing function for the transport channel and delivers the MAC PDU to the U-LTE PHY layer 933. Then, the U-LTE PHY layer 933 performs digital signal processing of the physical layer including coding or modulation on the MAC PDU (or TrBK) received from the U-LTE MAC, To the U-LTE RU 934.

Transmitting node RU (900 ₂₎ LTE RU functional block (915), WLAN RU functional block 925, and the U-LTE RU function block 935 of the can, the data received from the PHY layer of the transmitting node DU (900 ₁₎ Performs analog signal processing and RF functions required for the system, and transmits the signal sequence to the radio section.

When the packet data is received through the LTE receive path, the LTE RU 915 receives the signal and completes the RF signal processing, and then transfers the data signal sequence to the LTE PHY layer 916. The LTE PHY layer 916 transfers the received TrBK generated through demodulation or decryption to the LTE MAC layer 917. The LTE MAC layer 917 generates a MAC SDU using the TrBK and transfers the generated MAC SDU to the LTE RLC layer 918. The LTE RLC layer 918 generates RLC SDUs from RLC PDUs using header information such as LCID, SN, FI, or LI of the RLC PDU, and transmits the generated RLC SDUs to the PDCP layer 940. At this time, the LTE RLC layer 918 can generate the RLC SDU by aligning the packet data according to the SN using the header information such as the SN and the RLC status information for supporting the retransmission function. That is, the LTE RLC layer 918 can sort the order of the packet data using the SN.

If the packet data is received via the WLAN receive path, the WLAN RU 925 passes the data signal sequence for which the RF signal processing has been completed to the WLAN PHY layer 926. The WLAN PHY layer 926 performs physical layer digital signal processing of the WLAN system including demodulation or decoding in the received data signal sequence and transfers the data signal sequence to which the digital signal processing is completed to the WLAN MAC layer 927. [ The WLAN MAC layer 927 performs the WLAN MAC function and transfers the MAC SDU to the LTE RLC layer 918. Or the receiving node DU 900 ₃ of another embodiment of the present invention may introduce a convergence function block 928 for interfacing between the LTE RLC layer 918 and the WLAN MAC layer 927. The convergence function block 928 located between the LTE RLC layer 918 and the WLAN MAC layer 927 may convert the MAC SDU of the WLAN system into an RLC PDU of the LTE system RLC layer 918. In another embodiment of the present invention, the convergence function block 928 may convert the packet data constituting the MAC frame into an RLC PDU of the LTE system RLC layer 918 and transmit the packet data to the LTE RLC layer 918.

The LTE RLC layer 918 receiving the RLC PDUs from the WLAN MAC layer 927 or the convergence functional block 928 generates RLC SDUs using header information such as LCID, SN, FI, or LI, To the PDCP layer 940. At this time, the LTE RLC layer 918 can generate the RLC SDU by aligning the packet data according to the SN, using the header information such as the SN and the RLC status information for supporting the retransmission function. That is, the LTE RLC layer 918 can deliver the RLC SDUs sorted according to the SN to the PDCP layer 940.

When the packet data is received through the U-LTE reception path, the U-LTE RU 935 transfers the data signal sequence completing the RF signal processing to the U-LTE PHY layer 936. The U-LTE PHY layer 936 delivers the received TrBK generated through demodulation or decryption to the U-LTE MAC layer 937. The U-LTE MAC layer 937 generates a MAC SDU using the TrBK and transfers the MAC SDU to the U-LTE RLC layer 938. The U-LTE RLC layer 938 generates an RLC SDU by aligning the order of packet data in the RLC PDU, and transmits the RLC SDU to the PDCP layer 940. At this time, the U-LTE RLC layer 938 can generate the RLC SDU by arranging the order of the packet data using the SN.

If the U-LTE RLC layer 931 does not exist in the U-LTE transmission path radio protocol, the U-LTE RLC layer 938 may not exist in the radio protocol of the U-LTE reception path. In this case, packet data may be delivered from the U-LTE MAC layer 937 to the PDCP layer 940, or packet data may be delivered from the U-LTE MAC layer 937 to the LTE RLC layer 918. When the packet data is transferred from the U-LTE MAC layer 937 to the PDCP layer 940, the ordering of the packet data may be performed in the U-LTE MAC layer 937 or the PDCP layer 940 may perform reordering ≪ / RTI > and sorting.

The PDCP layer 940 includes an LTE RLC layer 918, a WLAN MAC layer 927, a convergence function block 928, a U-LTE The packet data received from the MAC layer 937 or the U-LTE RLC layer 938 may be transmitted to the upper layer through the same bearer.

The fusion functional blocks in the WLAN transmission path and the WLAN reception path as described above can be selectively introduced and can be omitted in other embodiments of the present invention. In addition, the U-LTE RLC layer in the U-LTE transmission path and the U-LTE reception path can be selectively introduced and can be omitted in the U-LTE wireless protocol according to another embodiment of the present invention.

In the radio protocol structure for RRA support according to another embodiment of the present invention, a U-LTE system using a frequency of unlicensed band may include only a physical layer and a MAC layer. That is, in the transmitting node DU 900 ₁ and the receiving node DU 900 ₃ in FIGS. 8 and 9, the U-LTE protocol layer includes only the U-LTE MAC layer and the U-LTE PHY layer. At this time, the aggregation and separation of the packet data for the RRA can be performed in the LTE RLC layer of the transmission and reception paths.

For example, in FIG. 9, the packet data may be delivered to the LTE RLC via the DPCP layer. At this time, the base station performs scheduling to determine the transmission path of the packet data as one of an LTE transmission path and a U-LTE transmission path. If the transmission path of the packet data is the LTE transmission path, the packet data is transferred to the LTE MAC layer. If the transmission path of the packet data is the U-LTE transmission path, the packet data is transferred to the U-LTE MAC layer. The U-LTE MAC layer transmits the data signal sequence to the U-LTE RU, and the data signal sequence can be transmitted to the wireless section by performing the analog signal processing and the RF function in the U-LTE RU. The U-LTE RU of the receiving node RU 900 ₄ performs RF signal processing on the received signal and then forwards the data signal sequence to the U-LTE PHY layer of the receiving node DU 900 ₃ . The U-LTE PHY layer transmits a digitally processed data signal sequence such as demodulation and decoding to the U-LTE MAC layer. Then, the U-LTE MAC layer generates a MAC SDU and can forward the MAC SDU to the LTE RLC layer. That is, if the WLAN system using the unlicensed frequency band or the wireless protocol of the U-LTE system is composed of only the PHY layer and the MAC layer, the LTE RLC layer can perform packet data separation and aggregation for RRA support. In this case, even if the MAC layer of the WLAN system or the U-LTE system does not support the retransmission function such as the ARQ, the retransmission function of the LTE RLC layer can be used, so that the transmission / reception reliability of the packet data can be improved. For example, if a transmission failure occurs on the transmission / reception path of the WLAN system or the U-LTE system during RRA support, the RLC layer of the transmission side may retransmit the failed RLC PDU through the possible communication path, The LTE RLC layer of the RLC PDU can re-order the RLC PDU by using the SN of the RLC PDU, thereby delivering the RLC SDU to the upper layer.

10 is a block diagram illustrating a wireless communication system according to another embodiment of the present invention.

Referring to FIG. 10, a wireless communication system according to an embodiment of the present invention includes a transmitting node 1010 and a receiving node 1020.

The transmitting node 1010 includes a processor 1011, a memory 1012, and a radio frequency unit (RF unit) 1013. The memory 1012 may be coupled to the processor 1011 to store various information for driving the processor 1011. [ The wireless communication unit 1013 may be connected to the processor 1011 to transmit and receive wireless signals. The processor 1011 may implement the functions, processes, or methods suggested by embodiments of the present invention. In this case, the wireless interface protocol layer in the wireless communication system according to an embodiment of the present invention may be implemented by the processor 1011. The operation of the transmitting node 1010 according to an embodiment of the present invention may be implemented by the processor 1011. [

The receiving node 1020 includes a processor 1021, a memory 1022, and a wireless communication unit 1023. The memory 1022 may be coupled to the processor 1021 to store various information for driving the process 1021. The wireless communication unit 1023 is connected to the processor 1021 to transmit and receive a wireless signal. The processor 1021 may implement the functions, steps, or methods suggested by embodiments of the present invention. In this case, the wireless interface protocol layer in the wireless communication system according to an embodiment of the present invention may be implemented by the processor 1021. [ The operation of the receiving node 1020 according to an embodiment of the present invention may be implemented by the processor 1021. [

In an embodiment of the present invention, the memory may be located inside or outside the processor, and the memory may be connected to the processor via various means already known. The memory may be any type of volatile or nonvolatile storage medium, e.g., the memory may include read-only memory (ROM) or random access memory (RAM).

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

Claims (20)

A service providing method of a base station,
Receiving a measurement result for at least one node located in the vicinity of the terminal from the terminal, and
Performing a radio resource aggregation of the base station with a first one of the at least one node based on the measurement result and providing a service to the terminal through the first node
And a service providing method. The method of claim 1,
Transmitting and receiving control information to and from the first node,
Transmitting information of the first node to the terminal
Further comprising the steps of: The method of claim 1,
Wherein the providing step comprises:
If off-loading is supported, forwarding all packet data of the service through the first node to the terminal
And a service providing method. The method of claim 1,
Wherein the providing step comprises:
When the carrier aggregation (CA) is supported, aggregating at least one first carrier assigned to the base station and at least one second carrier allocated to the first node and transmitting the packet data of the service to the terminal Steps to Deliver
And a service providing method. The method of claim 1,
Wherein the providing step comprises:
The method comprising collecting at least one first radio resource allocated to the base station and at least one second radio resource allocated to the first node when radio resource aggregation (RRA) is supported, To the terminal
And a service providing method. The method of claim 1,
Wherein the first node is a node of a mobile communication network using an unlicensed frequency band. 1. A method for receiving a service of a device of a mobile communication network using an unlicensed frequency band,
Searching for a presence of another wireless device using the contention-based area in a contention-based area included in a wireless frame of the mobile communication network, and
If it is possible to occupy the first radio resource included in the contention-based area as a result of the search, transmitting the service from the base station of the mobile communication network or the node of the mobile communication network using the unlicensed frequency band using the first radio resource receiving a
And receiving the service. 8. The method of claim 7,
Receiving a second radio resource in a contention-free area included in the radio frame through scheduling of the base station,
Receiving the service using the first radio resource or the second radio resource
Further comprising: 9. The method of claim 8,
Wherein the contention-based domain and the contention-based domain occupy different portions in the time domain of the radio frame. 9. The method of claim 8,
Wherein the contention-based domain and the contention-based domain occupy different portions in the frequency domain of the radio frame. The method of claim 9,
Wherein the contention-based region and the contention-free region each include at least one subframe, and the number of at least one subframe included in the contention-based region and the number of at least one subframe included in the contention- A method for receiving different services for each wireless frame. 11. The method of claim 10,
Wherein the contention-based region and the contention-based region each include at least one subcarrier, and the number of at least one subcarrier included in the contention-based region and the number of at least one subcarrier included in the contention- A method for receiving different services for each wireless frame. 9. The method of claim 8,
Wherein the contention-based area and the contention-based area are allocated to at least one physical layer control channel to which a unit of radio resources, a radio resource structure, a modulation and coding scheme (MCS) And the number of at least one physical layer control channel included in the contention-based area and the number of at least one physical layer control channel included in the contention-based area are different for each radio frame. 8. The method of claim 7,
Wherein the searching step comprises:
Before requesting a radio resource to the base station or a node of the mobile communication network, sensing whether another radio device is present in the vicinity
And receiving the service. 8. The method of claim 7,
Wherein the searching step comprises:
Measuring the energy of a signal of a radio resource to which the system information is transmitted, and searching for existence of another radio apparatus using the contention-based region
And receiving the service. A transmitting apparatus for transmitting packet data using radio resources of a mobile communication network and radio resources of a wireless local area network,
A scheduler for determining a transmission path of the packet data as one of a first transmission path of the mobile communication network and a third transmission path of a mobile communication network using a frequency of a second transmission path or an unlicensed band of the wireless local area network,
Based on the determination of the scheduler, for transferring the packet data to one of the first transmission path, the second transmission path or the third transmission path,
. 17. The method of claim 16,
A packet data convergence protocol (PDCP) layer based on the mobile communication network; a convergence function block for interfacing a media access control (MAC) layer of the wireless local area network
Further comprising: The method of claim 17,
Wherein the fusing function block converts packet data units (PDUs) of the PDCP layer according to a service data unit (SDU) of the MAC layer. 17. The method of claim 16,
Wherein,
And a packet data convergence protocol (PDCP) layer of the mobile communication network. 17. The method of claim 16,
Wherein,
And a radio link control (RLC) layer of the mobile communication network.

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