KR20170072072A - Method and apparatus for determining transmission priority of beam component carriers in communication system - Google Patents

Abstract

An apparatus for determining a transmission priority of a beam element carrier in a base station of a communication system using a frequency band of each of a plurality of beams divided into a plurality of FAs (Frequency Allocation) called beam element carriers includes a serving beam And a CQI report data including CQI information of the serving beam reported from the UE, the transmission priority of the FAs included in the active FA set of the terminal including the FAs activated for transmission And a scheduler for scheduling data to be transmitted to the MS according to a transmission priority of the FAs.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for determining a transmission priority of a beam element carrier in a communication system,

The present invention relates to a method and an apparatus for prioritizing transmission of a beam element carrier in a communication system, and more particularly to a method of determining a transmission priority of an FA (Frequency Allocation) called an element carrier of each beam in a communication system using multiple beams And apparatus.

The 5G technology, which will be commercialized after 2020, aims to provide the terminal with services that support 1000 times the transmission capacity at any time and anywhere compared to 4G. However, the spectral efficiency approaches the Shannon limit, which is the theoretical limit, requiring other technical alternatives.

Meanwhile, in International Mobile Telecommunications (IMT) -Advanced technology, a method of transmitting and receiving using a wide bandwidth is proposed as an alternative to meet the data transmission speed. 3GPP sets the maximum supported bandwidth of LTE-A (Long Term Evolution Advanced) at 100MHz. Carrier aggregation (CA) technology has been introduced because of the lack of frequency resources that can be allocated to a single 100 MHz bandwidth. CA technology is a communication technology that enables broadband transmission by integrating multiple small frequency bandwidths. CA technology is technically more difficult than single broadband technology and increases product cost.

Meanwhile, an LTE terminal using multi-carrier technology can transmit up to 75Mbps in a single frequency bandwidth, whereas an LTE-A terminal supporting CA technology can transmit up to 150Mbps using two frequency bandwidths. In 3GPP, various CA combinations are defined for each release, and each carrier frequency band constituting the CA combination is defined as a component carrier (CC).

When a CA is used, a terminal can access a base station using one primary CC and a plurality of secondary CCs. Therefore, the terminal can simultaneously use up to five frequencies up to 20MHz bandwidth including the main CC to use up to 100MHz. Currently, a total of 43 frequency bands and various CA combinations are defined in 3GPP TS 36.101. The defined CA combination can be classified into an intra-band CA combination that bundles the same frequency band and an inter-band CA combination that bundles different frequency bands. And intra-band CA combinations can be classified into a contiguous CA and a non-contiguous CA. This is because the frequency bands allocated to and used by network operators are different.

In this conventional technology, although the maximum bandwidth of 100 MHz is supported by applying the CC technology, 5G technology, which will be commercialized after 2020, can not satisfy the requirement of 1000 times the transmission rate of 4G. Also, in the current band of 6GHz or less, additional radio frequency resources are lacking to support this. In order to solve this problem, 5G technology is proposed as an alternative to use a millimeter wave band of 6 GHz or more for cellular communication. Generally, millimeter waves are strong against interference, but have a lot of signal attenuation. This characteristic can be overcome by applying a beam forming technique. Therefore, the base station can generate a plurality of beams using beam forming technology and concentrate the transmission power into beams of a narrow area, thereby increasing the transmission efficiency to the terminal and expanding the transmission coverage.

On the other hand, each beam in the beam forming base station uses the same frequency band to maximize the efficiency of frequency reuse. Since the available frequency resources are relatively abundant in the millimeter wave band, each beam can use a bandwidth of 1 GHz or more to increase the transmission amount. However, with the present technology, broadband transmission of 1 GHz or more increases the complexity of radio equipment for both the base station and the terminal. Therefore, the beam using the wide bandwidth needs to be composed of a plurality of beam CCs by applying the CA technique. In other words, each beam is composed of a smaller unit beam CC operating independently again, and the terminal receives service by connecting to a specific beam CC of a specific beam operated by the base station. Therefore, the base station must be able to report CQI information on each beam CC in a plurality of beams from the terminal and schedule the CQI information according to the priority.

However, the complexity of the scheduling of the beamforming base station increases with the number of neighbor base stations, the number of beams operated by the base station, and the number of beam CCs. And the amount of uplink CQI information also increases as a product of these values. In particular, since a base station based on a millimeter wave is suitable for a small base station in terms of signal characteristics, a large number of base stations can be installed in a narrow region, thereby increasing the amount of CQI information. In addition, due to the millimeter wave characteristic, much propagation environment change occurs in each beam CC even for small movement of the user, so the measurement cycle must be shortened in order to increase the accuracy of the CQI information for each beam CC, so the amount of uplink CQI transmission is large .

A problem to be solved by the present invention is to minimize the amount of CQI information reported for each beam element carrier of each beam of a terminal and to determine a transmission priority of a beam element carrier using CQI information for each beam element carrier of each beam reported from the terminal And to provide a method and apparatus for determining a transmission priority of a beam element carrier in a communication system having a transmission priority.

According to one embodiment of the present invention, there is provided a method of determining a transmission priority of a beam element carrier in a base station of a communication system using a frequency band of each of a plurality of beams divided into a plurality of FAs (Frequency Allocation) called beam element carriers / RTI > A method for determining a transmission priority of a beam element carrier comprises the steps of: receiving CQI report data including CQI information of a serving beam of a serving cell from a terminal; determining, based on CQI information of the serving beam, Determining a transmission priority of one FA, and scheduling data to be transmitted to the terminal according to a transmission priority of the at least one FA, wherein the CQI information of the serving beam is transmitted to each of the plurality of FAs Wherein the CQI report value of the main FA among the plurality of FAs includes the entire CQI report value and the CQI report value of each of the other FAs excluding the main FA among the plurality of FAs includes a CQI report value of the main FA, And the difference between the CQI measurement value and the CQI measurement value of the corresponding FA.

Wherein the CQI report data further includes CQI information of a neighboring beam of the serving cell and CQI information of beams of neighboring cells, and the transmission priority order determination method of the beam element carrier comprises a handover Wherein the CQI information of a neighboring beam of the serving cell includes a CQI average value for a CQI measurement value of a predetermined number of FAs having a higher CQI measurement value in a beam for each beam identifier, The CQI information of the beams of the cells may include a CQI average value for CQI measurement values of the set number of FAs having a high CQI measurement value according to each beam identifier for each cell identifier.

Wherein the handover or beam switching comprises determining if the CQI average value of the neighboring beams in the serving beam is greater than or equal to the CQI average value of the CQI measurements of the set number of FAs in the active FA set, And determining beam switching.

The step of determining handover or beam switching may further include performing beam switching on the neighboring beam and then initializing and resetting the active FA set of the terminal based on the received CQI report data.

Wherein the determining of the handover or beam switching comprises: if the CQI average value of one of the beams in the neighboring beam is greater than or equal to the CQI average value of the CQI measurement values of the set number of FAs in the active FA set, And determining a handover with one beam.

The set number of FAs may include a primary FA and a secondary FA having a high CQI measurement value among the maximum number of FAs that the terminal can receive and process.

The transmission priority order determination method of the beam element carrier may further include changing an FA in the active FA set of the mobile station based on the CQI information of the serving beam.

Wherein the modifying comprises: determining an FA to be activated and an FA to be activated based on the CQI report values of the plurality of FAs; adding a FA to be activated to the active FA set; And removing from the set.

The changing step may further include activating a FA added to the active FA set, generating a MAC CE to deactivate the FA removed from the active FA set, and transmitting the MAC CE to the terminal.

According to another embodiment of the present invention, the transmission priority of the beam element carrier is determined in a base station of a communication system using a frequency band of each of a plurality of beams divided into a plurality of FAs (Frequency Allocation) called beam element carriers Device is provided. The transmission prioritization apparatus of the beam element carrier includes a beam mapper and a scheduler. The beam mapper establishes a serving beam for the connected terminal. The scheduler determines the transmission priority of the FAs included in the active FA set of the terminal including FAs activated for transmission using the CQI report data including the CQI information of the serving beam reported from the terminal And schedules data to be transmitted to the mobile station according to the transmission priority of the FAs.

Wherein the CQI information of the serving beam includes a CQI report value of each of the plurality of FAs, the CQI report value of the main FA among the plurality of FAs includes the entire CQI measurement value, The CQI report value of each of the remaining FAs may include a difference value between the CQI measurement value of the main FA and the CQI measurement value of the corresponding FA.

The CQI report data further includes CQI information of neighboring beams of the serving cell and neighboring cells, and CQI information of a neighboring beam of the serving cell includes a set number of CQIs And the CQI information of the CQI measurement values of the FAs includes the CQI average value of the CQI measurement values of the set number of FAs having a high CQI measurement value according to each beam identifier for each cell identifier .

The beam mapper may determine handover or beam switching based on the CQI average value of the neighboring beam in the serving beam and the CQI average value of the beams of the neighboring cell.

The beam mapper may determine beam switching to the neighboring beam in the serving beam if the CQI average value of the neighboring beam in the serving beam is greater than or equal to the CQI average value of the CQI measurements of the set number of FAs in the active FA set .

Wherein the beam mappers are configured to perform handover to any one of the beams in the neighbor beam if the average value of the CQIs of any one of the beams in the neighbor beam is greater than or equal to a CQI average value of CQI measurements of the set number of FAs in the active FA set You can decide.

The scheduler may change the FA in the active FA set based on the CQI report value of each of the plurality of FAs.

The scheduler determines an FA to be activated and an FA to be inactivated based on the CQI report value of each of the plurality of FAs, adds the FA to be activated to the active FA set, removes the FA to be deactivated from the active FA set .

According to the embodiment of the present invention, it is possible to reduce the amount of CQI information reported from the UE, and to schedule the data by determining the transmission priority of the beam element carrier based on the CQI information reported from the UE.

1 is a diagram illustrating a millimeter-wave based communication system according to an embodiment of the present invention.
2 is a diagram illustrating an example of a beam-by-beam FA according to an embodiment of the present invention.
3 is a diagram illustrating an example in which a UE according to an embodiment of the present invention uses a plurality of FAs in a specific beam.
4 is a diagram illustrating a structure of a BS and a UE according to an embodiment of the present invention.
5 is a diagram illustrating a CQI reporting method of a UE according to an embodiment of the present invention.
6 is a flowchart illustrating a method of transmitting data according to transmission priority of an FA in a base station according to an embodiment of the present invention.

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

Throughout the specification and claims, when a section is referred to as "including " an element, it is understood that it does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), 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 all or all of ABS, Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR- And may include negative functionality.

A method and apparatus for determining a transmission priority of a beam element carrier in a communication system according to an embodiment of the present invention will now be described in detail with reference to the drawings.

1 is a diagram illustrating a millimeter-wave based communication system according to an embodiment of the present invention.

Referring to FIG. 1, a millimeter-wave based mobile communication system includes a beam forming base station (hereinafter referred to as a "base station") 100 and at least one terminal 200.

The base station 100 communicates with the terminal 200 using a millimeter wave band.

The millimeter wave band is broader than the 6GHz band used in conventional mobile communication networks and is easy to allocate continuous radio resources, thereby increasing the capacity of the communication system. However, since the millimeter-wave band has strong linearity and propagation loss, the base station 100 uses a beam forming technique to overcome this.

The base station 100 generates a plurality of beams B1 to Bn in a cell through beamforming and operates a plurality of beams B1 to Bn. The plurality of beams B1 to Bn each have a unique beam identifier, and each beam B1 to Bn may be overlapped with an adjacent beam.

The beam forming technique can be classified into a fixed type and an adaptive beam forming technique. Fixed beams generated by fixed beam forming techniques each have a defined beam direction and beam size. The base station 100 may generate multiple beams B1 to Bn to cover the entire cell.

Some of the plurality of beams B1 to Bn may be grouped to form a sector. For example, base station 100 may generate and operate 48 beams, and 48 beams may cover the entire cell. Then, 16 beams are grouped to form one sector.

Each beam in a sector (or cell) has the same cell specific-reference signal (CRS) location. Thus, each beam in the base station 100 has the same cell identifier, but different beam identifiers. In other words, a beam state information-reference signal (BSI-RS) is assigned to each beam in the same sector. Here, the BSI-RS may be the same as or similar to the concept of CSI-RS of LTE.

In addition, each beam in a sector (or cell) broadcasts the same system information, that is, MIB (Master Information Block) and SIB (System Information Block) information.

In the millimeter wave band, since the available frequency resources are relatively abundant, each of the beams B1 to Bn can use a bandwidth of 1 GHz or more. Also, each of the beams B1 to Bn performs the service using the entire frequency band of 1 GHz. That is, all of the beams B1 to Bn use the same frequency band and the same time slot, and a plurality of terminals belonging to the same beam communicate with the base station 100 by being allocated orthogonal components divided in time or frequency domain.

However, both the base station 100 and the terminal 200 increase the complexity of the radio equipment in the broadband transmission of 1 GHz or more. For example, broadband transmission has a direct impact on the power consumption and complexity of the DAC / ADC as well as the front-end digital signal processing by increasing the sampling rate of the transmitter and receiver. RF components also generally suffer from the complexity of the design itself and the increased manufacturing cost to support a wide bandwidth. Therefore, each beam using the optical bandwidth needs to be divided into a plurality of frequency allocations (FA) called a beam element carrier by applying the CA technique and operating the optical bandwidth. In the following, the beam element carrier is referred to as FA.

2 is a diagram illustrating a plurality of FAs according to an embodiment of the present invention.

Referring to FIG. 2, each of the beams B1 to Bn divides the entire frequency band into a plurality of FAs (FA1 to FAk). In FIG. 2, only one beam Bi among the plurality of beams B1 to Bn is shown.

For example, when the entire frequency band of the beams B1 to Bn is 1 GHz, it can be divided into 8 frequency assignments having a bandwidth of 125 MHz and operated.

In this way, when each of the beams B1 to Bn is divided into a plurality of FAs, the terminal 200 is connected to at least one FA among a plurality of FAs of a specific beam to be serviced.

(Primary Synchronization Signal), SSS (Secondary Synchronization Signal), PBCH (Physical Broadcast Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid ARQ Indicator Channel) PDCCH Physical Downlink Control Channel (PUCCH), and Physical Random Access Channel (PRACH).

Meanwhile, the operation of each FA (FA1 to FAk) is similar to the operation of CC (component carrier) in CA (Carrier aggregation) described in the related art. However, due to the characteristics of the millimeter-wave band, the bandwidth of each FA (FA1 to FAk) can be 125 MHz or more and the number of FAs to be added can be 5 or more.

Of the plurality of FAs (FA1 to FAk), one FA is used as a primary FA and the remaining FAs are used as a secondary FA. The terminal 200 performs an initial connection process using the main FA. The UE 200 may perform an initial connection process of transmitting an RRC (Radio Resource Control) connection request message or an RRC connection re-establishment request message to the BS 100 using the primary FA.

The base station 100 may add or remove the FAs using the RRC connection reconfiguration message. The main FA is composed of a pair of uplink FA and downlink FA and is always active. On the other hand, the FA is in the inactive state, and the base station 100 activates or deactivates the FA by using the MAC CE (Control Element).

The UE 200 measures CQIs for FAs FA1 to FAk of the serving beam and the neighboring beams and reports CQI information for FAs FA1 to FAk to the base station 100 via the PUCCH. The base station 200 transmits the BSI-RS through the FAs FA1 to FAk of the serving beam and the neighboring beams, and the terminal 200 transmits the BSI-RS to the FAs FA1 to FAk of the respective beams using the received BSI- CQI information can be measured.

The base station 100 can determine beam switching in the same cell of the terminal 200 based on the CQI information of FAs FA1 to FAk of each beam reported from the terminal 200. [ That is, the terminal 200 can perform beam switching with another beam of the same cell according to the determination of the base station 100.

In addition, the base station 100 may determine inter-cell beam switching based on CQI information of FAs (FA1 to FAk) of each beam of neighboring base stations received from the neighboring base station. The terminal 200 may perform beam switching with the beam of the neighboring base station according to the determination of the base station 100. [

At this time, beam switching in the same cell can be performed in the MAC (Media Access Control) layer using DCI (Downlink Control Information) of the PDCCH and beam switching to other cells can be performed using a handover procedure of the RRC layer have.

3 is a diagram illustrating an example in which a UE according to an embodiment of the present invention uses a plurality of FAs in a specific beam.

3, the UE 200 selects one of the FAs FA1 to FA8 operating within the 1 GHz bandwidth of the specific beam B i and a plurality of FAs (for example, FA 4 and FA 6) ) And can connect to the base station 100.

The frequency band that the terminal 200 can receive is limited to M FAs. Here, M may be different depending on performance or implementation of the terminal 200.

The terminal 200 accesses the serving beam using the primary FA1 and then adds the secondary FAs FA4 and FA6 according to the user's request. Therefore, the performance of the UE 200 in the scheduling of the BS 100 can be determined according to which beam is connected and which FA in the beam is used. If the terminal 100 uses a plurality of FAs, the performance of the terminal 200 may be different depending on which FA is preferentially scheduled.

Therefore, the base station 100 reports the CQI information of each FA (FA1 to FA8) in each of the beams B1 to Bn from the terminal 200 to determine the transmission priority of each FA (FA1 to FA8) The mobile station 200 schedules the data to be transmitted to the mobile station 200 according to the transmission priority of the mobile station 200.

4 is a diagram illustrating a structure of a BS and a UE according to an embodiment of the present invention.

The base station 100 includes a transmitter 110 and a receiver 120. The transmitter 110 may correspond to an apparatus for prioritizing transmission of a beam element carrier according to an embodiment of the present invention.

The transmitter 110 includes a Packet Data Convergence Protocol (PDCP) / Radio Link Control (RLC) processor 112, a beam mapper 114, and a MAC processor 116. The PDCP / RLC processor 112, the beam mover 114 and the MAC processor 116 of the transmitter 110 are connected to at least one processor implemented as a central processing unit (CPU) or other chipset, ≪ / RTI > And instructions for performing in the processor may be loaded or stored in memory or storage. The processor may execute instructions that are loaded or stored in memory to perform the operations described below. The processor and the memory are connected to each other via a bus (not shown), and an input / output interface (not shown) may be connected to the bus. At this time, a transceiver is connected to the input / output interface, and peripheral devices such as an input device, a display, a speaker, and a storage device may be connected.

The PDCP / RLC processor 112 processes the radio bearer to the terminal 200 connected to the base station 100. For example, the PDCP / RLC processor 112 can set up the radio bearers (RB # 1, RB # p) for the terminal 200. [

The beam mapper 114 maps the connected terminal 200 to one of the plurality of beams B1 to Bn. That is, the beam mapper 114 can set the serving beam of the connected terminal 200. For example, the beam mapper 114 maps the connected terminal 200 to the beam B1 and transmits data of the radio bearers RB # 1 and RB # p set in the terminal 200 to the MAC processor 116 from within the plurality of beam processor (1162 ~ ₁ 1162 _n) is transmitted to the beam processor _{(1162: 1)} for the beam (B1). Hereinafter, it is assumed that the terminal 200 is mapped to the beam B1 for convenience.

The MAC processor 116 includes a scheduler 1161 and a plurality of beam processors 1162 ₁ through 1162 _n .

The plurality of beam processors 1162 ₁ to 1162 _n form a plurality of beams B1 to Bn, respectively, and process data transmitted through the plurality of beams B1 to Bn. Each beam processor 1162 ₁ to 1162 _n includes a plurality of FA processors 1163 ₁ to 1163 _k . The plurality of FA processors 1163 ₁ to 1163 _k process data to be transmitted through a plurality of FAs (FA1 to FAk), respectively. The plurality of FA processors 1163 ₁ to 1163 _{k in the} beam processors 116 _{2 1} to 116 2 _n may perform a hybrid automatic repeat request (HARQ) function.

The scheduler 1161 generates and manages an active FA set of the terminal 200. The active FA aggregation means a set in which the base station 100 has FAs as elements for activating a radio bearer transmission of a specific UE.

Also, the scheduler 1161 schedules the data of the radio bearers established in the UE 200 by determining the transmission priority of each FA by using the CQI information for each FA of each beam reported from the UE 200. [

The terminal 200 is mapped to a specific beam (for example, B1) in the initial connection process by the beam mapper 114 and establishes a connection with the base station 200 using the main FA. The primary FA is determined by the base station operator when the base station 100 is installed, and information on the primary FA can be transmitted to the terminal 200 through the SIB (System Information Block).

The scheduler 1161 uses the RRC connection reconfiguration message to add the terminal 200 to the FAs other than the main FA in the beam as a sub FA. As described above, the scheduler 1161 may use the RRC connection reconfiguration message to add or remove the FA of the terminal 200. [

Meanwhile, the scheduler 1161 additionally activates a sub FA to satisfy the QoS when the radio bearers RB # 1 and RB # p of the UE 200 are set. The scheduler 1161 generates an active FA set of the terminal 200 in the initial access procedure of the terminal 200 and adds the main FA to the active FA set. Also, the scheduler 1161 may add a further activated FA to the active FA set so as to satisfy the QoS requirement when setting up the radio bearer of the UE 200. [ Therefore, the active FA aggregation of the UE 200 may include a main FA and additional FAs that are additionally activated when the radio bearer is established.

The terminal 200 may include a MAC reception processor 210 and a MAC transmission processor 220. The MAC receive processor 210 includes a beam processor 212 and a measurement processor 214. The beam processor 212 includes a plurality of FA processors 2121 ₁ to 2121 _n .

The beam processor 212 processes signals received from the base station 100 over a particular beam. The plurality of FA processors 2121 ₁ to 2121 _{n in the} beam processor 212 process signals received through the FAs included in the active FA set of the terminal 200 among the plurality of FAs FA 1 to FAk. The FA processors 1163 ₁ to 1163 _{k of} the beam processor (for example, 1162 ₁ ) corresponding to the specific beam of the base station 100 to which the terminal 200 is mapped are provided in the beam processor 212 of the terminal 200 _One- to-one correspondence with a plurality of FA processors 2121 ₁ to 2121 _m . Here, m? K.

For example, when the radio bearer (RB # p) of the terminal 200 is mapped to the beam B1, among the plurality of FA processors 1163 ₁ to 1163 _{k in the} beam processor 1162 ₁ , The two FA processors 1163 ₁ and 1163 _{2 for the} FAs corresponded one to one with the two FA processors (e.g., 2121 ₁ and 2121 ₂ ) in the beam processor 212.

When a plurality of FA processors 2121 ₁ to 2121 _{n in the} beam processor 212 receive signals through FAs included in the active FA set among a plurality of FAs FA 1 to FAk, And transmits the HARQ feedback information to the MAC transmission processor 220. [ The FA processors 2121 ₁ to 2121 _m generate acknowledgment (ACK) feedback in the HARQ feedback if they successfully decode the received data, and perform negative acknowledgment (NACK) in the HARQ feedback if they fail to decode the received data. Feedback can be generated. The FA processors 2121 ₁ to 2121 _n respectively measure the CQI from the received BSI-RS when the BSI-RS is received through the FAs included in the active FA set among the plurality of FAs (FA 1 to FAk) And transmits the CQI information to the MAC transmission processor 220.

The measurement processor 214 measures the number of FAs (FA1 to FAk) included in the FAs included in the active FA set from the BSI-RS received through the FAs not included in the active FA set among the plurality of FAs (FA1 to FAk) Measures the CQI, and transmits the measured CQI information to the MAC transmission processor 220. That is, the measurement processor 214 measures the CQI for the deactivated FAs.

The MAC transmission processor 220 includes a beam processor 222 and the beam processor 222 transmits the HARQ feedback information of the FAs included in the active FA set to the base station 100 through the beam mapped by the terminal 200 do. The beam processor 222 also transmits CQI information on the FAs FA1 to FAk of the beams B1 to Bm to the base station 100. [

The receiver 120 of the base station 100 includes a PDCP / RLC processor 122 and a MAC processor 124. The MAC processor 124 includes a beam processor 1241. The beam processor 1241 receives the HARQ feedback information of the FAs included in the active FA set transmitted through the beam from the terminal 200, And forward the HARQ feedback information of the included FAs to the scheduler 1161 of the transmitter 110 and the beam processor 1162 ₁ that processes the mapped beam to the terminal 200. The beam processor 1241 also transmits CQI information for a plurality of FAs (FA1 to FAk) of each of the beams B1 to Bm to the beam mapper 114. [

The PDCP / RLC processor 122 processes the data of the radio bearer established for the UE 200 using the PDCP / RLC protocol.

In general, when data of a radio bearer (for example, RB # p) is transmitted using a plurality of FAs in an active FA set, the transmission priority of each FA is based on CQI information reported periodically from the terminal 200 do. Therefore, the amount of uplink CQI information increases in proportion to the number of peripheral base stations, the number of beams operated by the base station, and the number of FAs of each beam. In particular, since the millimeter-wave based base station 100 is suitable for a small base station in terms of signal characteristics, a large number of base stations can be installed in a narrow region, and thus the amount of uplink CQI information is further increased. In addition, due to the millimeter wave characteristic, much propagation environment change occurs in each FA of each beam even in a small movement of the user. To increase the accuracy of CQI information for each FA of each beam, the measurement period of the CQI must be shortened. The transmission amount is further increased. Therefore, a CQI reporting method is needed to minimize the amount of CQI information transmitted in the uplink.

5 is a diagram illustrating a CQI reporting method of a UE according to an embodiment of the present invention.

5, the measurement processor 214 of the UE 200 measures CQI information on the serving beam and the neighboring beams of the serving cell and CQI information on the beams of the neighboring cell, and measures the measured CQI information And reports it to the base station 100.

The CQI report of the serving beam of the serving cell includes the CQI report value of the entire FA (FA1 to FAk) of the serving beam. In this case, the CQI report value of the main FA among the total FAs (FA1 ~ FAk) includes the entire CQI measurement value of the main FA, and the CQI report value of the sub FAs excluding the main FA among the total FAs, Lt; RTI ID = 0.0 > CQI < / RTI > That is, the measurement processor 214 measures the CQI of all the FAs (FA1 to FAk) of the serving beam, reports the entire CQI measurement value for the main FA, and reports the entire CQI measurement value of the FA for the FA But reports the difference value between the CQI measurement value of the primary FA and the CQI measurement value of the FA to the base station 100. The amount of uplink CQI transmission can be reduced according to the CQI report of the serving beam of the serving cell.

The CQI report of a neighboring beam of a serving cell includes a number of neighboring beams, a beam identifier of each neighboring beam, and a CQI average value of m FAs in a beam corresponding to the beam identifier. The number of neighboring beams indicates the number of neighboring beams that the terminal 200 is capable of receiving signals in the serving cell. The beam identifier indicates a beam identifier of a neighboring beam to be reported at present. The CQI average value for m FAs represents an average value of CQIs for m FAs among k FAs (FA1 to FAk) transmitted by the base station 100 in the corresponding beam. The measurement processor 214 calculates an average value of CQI measurement values for the main FA and the most significant (m-1) FAs among the CQI measurement values for the k FAs FA1 to FAk measured in each neighboring beam, And reports to the base station 100 the average CQI values according to the number of neighboring beams and the beam identifier of the neighboring beam. Here, m represents the maximum number of FAs that the terminal 200 can receive and process.

The CQI report of the beam belonging to the neighboring cell includes CQI information of the beam corresponding to the cell number, the cell identifier, and the cell identifier. The CQI information of the beam corresponding to the cell identifier is reported in the same manner as the CQI report of the neighboring beam of the serving cell described above. That is, the CQI information of the beam corresponding to the cell identifier includes the number of beams, the beam identifier of each beam, and the CQI average value for m FAs in the beam corresponding to the beam identifier. The number of cells represents the number of cells to report.

Thus, the UE 200 does not report the CQI values for all the FAs in the CQI report beam for the neighboring beam or neighboring beam of the serving beam. Instead, the terminal 200 calculates an average value for the highest m CQIs among the CQI measurement values for the main FA and (n-1) sub FAs, and transmits the calculated average value to the base station 100. Therefore, the m CQI average value means the average value of the CQIs for the highest (m-1) FAs and one FA among the total (n-1) FAs received from the BS. This CQI reporting method also reduces the amount of uplink CQI transmission.

6 is a flowchart illustrating a method of transmitting data according to transmission priority of an FA in a base station according to an embodiment of the present invention.

Referring to FIG. 6, the BS 100 generates an active FA set for the MS 200 (S602). The terminal 200 is mapped to the specific beam B1 in the initial connection process and establishes a connection with the base station 100 using the FA processor corresponding to the main FA in the beam. The base station 100 uses the RRC connection reconfiguration message for the FAs other than the in-beam main FA to add the terminal 200 as a secondary FA. At this time, the base station 100 may add a primary FA to the active FA aggregation for the terminal 200. [

The base station 100 sets up a radio bearer for the terminal 200 (S604). The base station 100 additionally activates a sub FA to satisfy QoS when setting up a radio bearer, and adds the activated sub FA to the active FA aggregation.

Meanwhile, the UE 200 periodically measures the CQIs of the serving beam and the neighboring beams of the currently connected serving cell and the beams of neighboring cells, generates CQI report data according to the method described in FIG. 5, 100).

The base station 100 receives the CQI report data from the UE 200 in step S606 and determines whether handover is required based on the CQIs of the serving beam and the neighboring beams of the serving cell and the neighboring cell beams in the CQI report data It is determined whether beam switching is necessary (S608, S610). The base station 100 determines beam switching when a CQI average value for a specific neighboring beam in the serving cell, that is, the target beam, is equal to or greater than m CQI average values in the active FA aggregation in the current serving beam. The base station 100 determines handover to a specific beam of a neighboring cell when a CQI average value for a specific beam in a neighboring cell, that is, a target beam, is equal to or greater than m average CQI values in the active FA aggregation in the serving beam.

If it is determined that handover is required, the base station 100 performs a handover procedure of the terminal 200 with the target beam of the neighboring cell (S612), and determines the active FA set of the terminal 200 for the target beam of the neighboring cell (S614). At this time, the handover procedure can follow the handover procedure in the existing LTE.

Meanwhile, when it is determined that beam switching is required, the base station 100 performs a beam switching procedure of the terminal 200 with the target beam of the serving cell (S616), initializes the active FA aggregation of the current terminal 200 (S618 ), And resets the active FA set of the terminal 200 to the target beam.

Meanwhile, the base station 100 can change the active FA set of the terminal 200 based on the CQI report value of each FA of the serving cell. It is possible to remove an FA having a poor CQI report value in the active FA aggregation of the UE 200 and add another FA having a good CQI report value in the active FA aggregation. At this time, whether or not it is good can be judged based on the set CQI threshold value.

The base station 100 uses the CQI report values of the FAs included in the active FA set of the terminal 200 when it is not necessary to change the FA in the active FA set for the terminal 200, The transmission priority is determined (S622).

The base station 100 schedules the data of the radio bearer set in the UE 200 according to the transmission priority of each FA in the active FA set and transmits the data to the UE 200 in operation S624.

Meanwhile, if it is determined that the FA of the active FA set for the terminal 200 needs to be changed, the base station 100 performs the FA switching procedure in the active FA set for the terminal 200 (S626). That is, the base station 100 activates a FA having a good CQI report value among a plurality of FAs based on a CQI report value of each FA of a serving beam through a FA switching procedure, deactivates a FA having a poor CQI report value, 200). ≪ / RTI >

The base station 100 generates a MAC CE so as to activate the FA added to the new active FA set for the terminal 200 and disable the FA removed from the newly activated FA set and transmits the MAC CE to the terminal 200 (S628).

In step S630, the BS 100 schedules data of the RB according to the transmission priority of each FA in the existing FA aggregation and transmits the data to the UE 200 in step S630.

Then, the base station 100 updates the existing active FA set to the new active FA set for the terminal 200 (S632).

The base station 100 may repeat the steps S608 to S632 based on the CQI report data periodically reported from the terminal 200. [

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented by a program for realizing functions corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

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

Claims (17)

A method for determining a transmission priority of a beam element carrier in a base station of a communication system using a frequency band of each of a plurality of beams divided into a plurality of FAs (Frequency Allocation) called beam element carriers,
Receiving CQI report data including CQI information of a serving beam of a serving cell from a UE,
Determining a transmission priority of at least one FA included in the active FA aggregation of the terminal based on the CQI information of the serving beam,
Scheduling data to be transmitted to the terminal according to a transmission priority of the at least one FA;
/ RTI >
Wherein the CQI information of the serving beam includes a CQI report value of each of the plurality of FAs,
Wherein the CQI report value of the main FA among the plurality of FAs includes the entire CQI measurement value and the CQI report value of each of the other FAs excluding the main FA among the plurality of FAs is the CQI report value of the main FA, The difference value of the CQI measurement value of the beam element carrier. The method of claim 1,
Wherein the CQI report data further includes CQI information of a neighboring beam of the serving cell and CQI information of beams of neighboring cells,
Determining handover or beam switching using CQI information of the CQI report data
Further comprising:
The CQI information of the neighboring beam of the serving cell includes a CQI average value of the CQI measurement values of the set number of FAs having a high in-beam CQI measurement value for each beam identifier,
Wherein the CQI information of the beams of neighboring cells includes a CQI average value for a CQI measurement value of a set number of FAs having a high CQI measurement value according to each beam identifier for each cell identifier. 3. The method of claim 2,
Wherein the handover or beam switching comprises determining if the CQI average value of the neighboring beams in the serving beam is greater than or equal to the CQI average value of the CQI measurements of the set number of FAs in the active FA set, And determining beam switching. ≪ Desc / Clms Page number 19 > 4. The method of claim 3,
Wherein the determining handover or beam switching further comprises initializing and resetting an active FA aggregation of the terminal based on received CQI report data after performing beam switching on the neighboring beam, How to prioritize. 3. The method of claim 2,
Wherein the determining of the handover or beam switching comprises: if the CQI average value of one of the beams in the neighboring beam is greater than or equal to the CQI average value of the CQI measurement values of the set number of FAs in the active FA set, And determining a handover with one beam. 3. The method of claim 2,
Wherein the set number of FAs includes a primary FA and a secondary FA having a high CQI measurement value among the maximum number of FAs that the terminal can receive and process. The method of claim 1,
Changing the FA in the active FA set of the terminal based on the CQI information of the serving beam
Further comprising: determining a transmission priority of the beam element carrier. 8. The method of claim 7,
The changing step
Determining an FA to be activated and an FA to be inactivated based on the CQI report values of each of the plurality of FAs,
Adding an FA to be activated to the active FA set, and
And removing the FA to be deactivated from the active FA aggregate. 9. The method of claim 8,
Wherein the modifying comprises activating an FA added to the active FA aggregate, generating a MAC CE to deactivate the FA removed from the active FA aggregate, and transmitting the MAC CE to the mobile station, Determination method. An apparatus for determining a transmission priority order of a beam element carrier in a base station of a communication system using a frequency band of each of a plurality of beams divided into a plurality of FAs (Frequency Allocation) called beam element carriers,
A beam mapper for setting a serving beam for the connected terminal, and
Determines the transmission priority of the FAs included in the active FA set of the mobile station including FAs activated for transmission using the CQI report data including the CQI information of the serving beam reported from the mobile station, A scheduler for scheduling data to be transmitted to the MS according to a transmission priority of the MS
Wherein the transmission priority determiner determines the transmission priority of the beam element carrier. 11. The method of claim 10,
Wherein the CQI information of the serving beam includes a CQI report value of each of the plurality of FAs,
Wherein the CQI report value of the main FA among the plurality of FAs includes the entire CQI measurement value and the CQI report value of each of the other FAs excluding the main FA among the plurality of FAs is the CQI report value of the main FA, The difference value of the CQI measurement value of the beam element carrier. 12. The method of claim 11,
Wherein the CQI report data further includes CQI information of a neighboring beam of the serving cell and CQI information of beams of neighboring cells,
The CQI information of the neighboring beam of the serving cell includes a CQI average value of the CQI measurement values of the set number of FAs having a high in-beam CQI measurement value for each beam identifier,
Wherein the CQI information of the beams of neighboring cells includes a CQI average value for a CQI measurement value of a predetermined number of FAs having a higher CQI measurement value according to each beam identifier per cell identifier. The method of claim 12,
Wherein the beam mapper determines a handover or a beam switching based on a CQI average value of the neighboring beam in the serving beam and a CQI average value of the beams of the neighboring cell. The method of claim 13,
Wherein the beam mappers are configured to determine the beam switching of the neighboring beams in the serving beam if the CQI average value of the neighboring beams in the serving beam is greater than or equal to a CQI average value of CQI measurements of the set number of FAs in the active FA set, A device for prioritizing transmission of element carriers. The method of claim 13,
Wherein the beam mappers are configured to perform handover to any one of the beams in the neighbor beam if the average value of the CQIs of any one of the beams in the neighbor beam is greater than or equal to a CQI average value of CQI measurements of the set number of FAs in the active FA set And determining a transmission priority of the beam element carrier. 12. The method of claim 11,
Wherein the scheduler changes an FA in the active FA set based on a CQI report value of each of the plurality of FAs. 17. The method of claim 16,
The scheduler determines an FA to be activated and an FA to be inactivated based on the CQI report value of each of the plurality of FAs, adds the FA to be activated to the active FA set, removes the FA to be deactivated from the active FA set A device for prioritizing transmission of a beam element carrier.

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