WO2017146273A1

WO2017146273A1 - Method for determining beam sector for terminal in bdma system and method for supporting mobility for terminal in bdma system

Info

Publication number: WO2017146273A1
Application number: PCT/KR2016/001689
Authority: WO
Inventors: 조동호; 정병창; 박대희; 한준상; 김윤식
Original assignee: 한국과학기술원
Priority date: 2016-02-22
Filing date: 2016-02-22
Publication date: 2017-08-31

Abstract

A method for supporting mobility for a terminal in a BDMA system comprises the steps of: a terminal measuring the signal strength of beam sectors respectively transmitted from a plurality of AP devices; the terminal transmitting the signal strength to a serving AP device which is an AP device for supporting a current service among the plurality of AP devices; the serving AP device transmitting information about the terminal and information about a target beam sector, which is determined on the basis of the signal strength among beam sectors provided from a target AP, to the target AP device which is an AP device determined on the basis of the signal strength among the plurality of AP devices; and the target AP device providing a service for the terminal by means of the target beam sector.

Description

A method of determining a beam sector for a terminal in a BDMA system and a method of supporting mobility for a terminal in a BDMA system

The technique described below relates to a technique for determining a beamsector for providing a service for a terminal in a BDMA system. The technique described below relates in particular to a technique for providing mobility of a terminal in a pattern / polarized BDMA system.

As traffic of high-speed data communication is rapidly increased in a wireless or mobile communication system, studies on beam division multiple access (BDMA) systems are actively conducted in next-generation communication systems. Further research on BDMA systems using patterned / polarized antennas is underway.

The technique described below is to provide a technique for determining a beam sector for providing a service to a terminal in a BDMA system using a pattern / polarization antenna. Furthermore, the technology described below is to provide a mobility support scheme that provides a service seamlessly to a mobile station in a BDMA system.

A method of determining a beamsector for a terminal in a BDMA system includes the steps of: measuring, by a terminal, signal strength of at least one beamsector transmitted from an AP device; transmitting, by the terminal, the signal strength to the AP device; and The apparatus includes providing a service for the terminal to a target beamsector determined based on the signal strength.

In a BDMA system, a mobility support method for a terminal includes: measuring, by a terminal, signal strengths of beam sectors transmitted from a plurality of AP devices, and wherein the terminal is an AP device that provides a current service among the plurality of AP devices; Transmitting the signal strength to the target AP device, wherein the serving AP device is an AP device determined based on the signal strength among the plurality of AP devices, information about the terminal, and among the beam sectors provided by the target AP; And transmitting the information about the target beamsector determined based on the signal strength to the target AP device, and providing the service for the terminal to the target beamsector by the target AP device.

The technique described below allows a certain QoS to be provided to a terminal in a BDMA system using a pattern / polarized antenna.

1 shows an example of a BDMA system.

2 is an example of a radiation pattern using a pattern / polarized antenna.

3 is an example illustrating the concept of a pattern / polarized BDMA system.

4 illustrates an example in which a terminal moves a beam sector provided by the same AP device.

5 is an example of a procedure flow diagram for a method of determining a beamsector for a terminal in a pattern / polarized BDMA system.

6 is another example of a procedure flowchart for a method of determining a beam sector for a terminal in a pattern / polarized BDMA system.

7 is another example of a procedure flowchart for a method of determining a beam sector for a terminal in a pattern / polarized BDMA system.

8 illustrates an example in which the same AP device transmits a reference signal for each beam sector.

9 is another example in which the same AP device transmits a reference signal for each beamsector.

10 illustrates an example in which the terminal moves to a beam sector provided by another AP device.

11 is an example of a procedure flow diagram for a method for supporting mobility for a terminal in a pattern / polarized BDMA system.

12 is another example of a procedure flowchart for a method of supporting mobility for a terminal in a pattern / polarized BDMA system.

13 is another example of a procedure flowchart for a method of supporting mobility for a terminal in a pattern / polarized BDMA system.

14 illustrates an example in which different AP devices transmit reference signals for beam sectors.

15 illustrates another example in which different AP devices transmit reference signals for beam sectors.

The following description may be made in various ways and have a variety of embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the technology described below to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the technology described below.

The terms first, second, A, B, etc. may be used to describe various components, but the components are not limited by the terms, but merely for distinguishing one component from other components. Only used as For example, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component without departing from the scope of the technology described below. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It is to be understood that the present invention means that there is a part or a combination thereof, and does not exclude the presence or addition possibility of one or more other features or numbers, step operation components, parts or combinations thereof.

Prior to the detailed description of the drawings, it is to be clear that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by.

In addition, in carrying out the method or operation method, each process constituting the method may occur differently from the stated order unless the context clearly indicates a specific order. That is, each process may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The technology described below is directed to a technique for providing a beam sector to a terminal in a beam division multiple access (BDMA) system. The technique described below relates to a technique for providing a beam sector to a terminal in a BDMA system (hereinafter, referred to as a pattern / polarized BDMA system) using a pattern / polarized antenna. First, the BDMA system and the pattern / polarization BDMA system will be briefly described.

1 shows an example of a BDMA system. BDMA system means a wireless communication system based on BDMA technology. In the BDMA system, the AP device 10 transmits beams to the terminals 5 at different angles (directions), respectively, and simultaneously transmits data to several terminals 5 (downlink). It is assumed that the AP device 10 knows the position of the terminal 5 in advance. The AP device 10 may use an antenna capable of changing the direction of the beam or beamforming a predetermined area.

Similarly, when the terminal 5 sends data to the base station, the terminal 5 transmits a beam directed to the AP device 10. One terminal does not dedicate one beam, and terminals at similar angles may communicate with the base station by sharing one beam. For example, in FIG. 1, Beam 2 becomes a channel through which three terminals and the AP device 10 communicate. In this case, it is preferable that terminals sharing one beam share frequency / time resources.

The AP device 10 includes a device such as a base station of mobile communication. For example, the AP device 10 includes a base station constituting a macro cell of mobile communication, an AP device constituting a small cell of mobile communication, an AP device of WiFi, and an AP device for short range communication such as ZigBee. It is a concept. In the following description, the AP device 10 refers to a device that communicates with the terminal 5 using a specific communication scheme. The AP device 10 may perform a function of connecting the core network and the terminal 5. For convenience of explanation, it is assumed that the AP device 10 is a base station (nodeB, eNodeB, etc.) of a mobile communication network.

The terminal 5 includes various devices that perform wireless communication through the AP device 10. For example, the terminal 5 includes a smartphone, a tablet PC, a notebook computer, a wearable device, and the like. The terminal 5 is basically carried by the user and has mobility. Alternatively, the terminal 5 may be attached to a moving device (vehicle, etc.) to have mobility. For convenience of explanation, it is assumed that the terminal 5 is a portable device such as a smart phone possessed by a user.

2 is an example of a radiation pattern using a pattern / polarized antenna. Pattern / polarized BDMA systems communicate using pattern / polarized antennas. The antenna may basically form a constant beam as described in FIG. The antenna includes an antenna element. Furthermore, the antenna element may exhibit different characteristics according to the shape and material of the antenna element.

Depending on the characteristics of the antenna element, the antenna may have a radiation pattern of a certain shape. 2 is an example of a radiation pattern that an antenna may represent. 2 largely illustrates two radiation patterns (n = 1 and n = 2). In addition, different patterns may be configured according to the direction in which the radiation pattern of the same shape is directed. FIG. 2 shows three different radiation patterns for radiation pattern n = 1 and five radiation patterns for radiation pattern n = 2. Furthermore, if the antenna uses a polarized antenna, it may provide different patterns depending on the direction in which the electric and magnetic fields travel.

When the AP device 10 transmits a signal using a unique radiation pattern (first radiation pattern), the terminal 5 may receive a signal by distinguishing the first radiation pattern from another radiation pattern. After all, the radiation pattern is a kind of channel that transmits a signal separately from the beam.

Hereinafter, the "pattern antenna" means an antenna device in which a plurality of antenna elements having a certain pattern are constantly arranged. The pattern antenna may include antenna elements having different patterns. In this case, the antenna device may be a device having a radiation pattern unique to the antenna device. Hereinafter, the "polarized antenna" means an antenna device in which antenna elements having a constant polarization pattern are constantly arranged. As described above, the polarized antenna refers to an antenna that transmits signals that are distinguished from each other in an electric field and a magnetic field area by simultaneously using an electric field antenna and a magnetic field antenna. Hereinafter, "pattern / polarized antenna" means an antenna device using both a plurality of antenna elements having a constant pattern and an antenna element having a constant polarization pattern.

3 is an example illustrating the concept of a pattern / polarized BDMA system. The pattern / polarized BDMA system refers to a wireless communication system based on the pattern / polarized BDMA technology. 3 shows an example of a pattern / polarization antenna on top. As shown in FIG. 3, the pattern / polarization antenna may be an antenna array. That is, the pattern / polarization antenna may include a plurality of unit patterns / polarization antennas. An antenna array composed of a plurality of unit pattern / polarized antennas is referred to as a pattern / polarized antenna array hereinafter. In FIG. 3, one unit pattern / polarization antenna 50 is represented by a dotted dotted line. One unit pattern / polarization antenna 50 includes a plurality of

antennas

51, 52, 53. 54. The plurality of

antennas

51, 52, 53. 54 have different radiation patterns, respectively.

The pattern / polarization antenna array may configure B beam sectors through beamforming. The pattern / polarization antenna array spatially separates the beams into beamsectors using beamformers with unique weights per sector, and uses beams with the same AoD (Angle of Direction) using different pattern / polarization antennas. Can transmit Through this, the pattern polarization antenna array may transmit a signal having a plurality of pattern / polarization characteristics simultaneously in each beam sector. Referring to FIG. 3, K different radiation patterns are simultaneously transmitted using K patterns / polarized antennas. That is, multiple-input multiple-output (MIMO) transmission is possible using a patterned polarization antenna array. If the terminal 5 uses one antenna, multiple-input single-output (MISO) transmission is possible.

A BDMA system using a pattern / polarized antenna is called a pattern / polarized BDMA system. In a pattern / polarized BDMA system, interference between multiple pattern / polarized signals constituting the same beam sector is previously removed by a precoder and then transmitted. The pattern / polarization BDMA system can simultaneously obtain the beamforming gain of the conventional BDMA system and the pattern polarization gain using the pattern / polarization antenna.

The terminal 5 may receive a service through a new beamsector provided by the AP device 10. Here, the service means that the AP device 10 or the core network provides constant data to the terminal through the downlink or receives constant data from the terminal through the uplink. For example, (1) when the terminal 5 moves to a different location from a beamsector currently serving (hereinafter, referred to as a serving beamsector), a new beamsector provided by the same AP device 10 may be allocated. (2) In addition, the terminal 5 may be allocated to a beam sector provided by another AP device 10B while moving to another location from the beam sector provided by one AP device 10A. In this case, since the AP device serving the terminal 5 is changed, it can be said to be a kind of handover. (3) Furthermore, when the terminal 5 is in an idle state and wants to perform communication, it may request a beam sector that can receive service. In this case, too, the terminal 5 may be allocated a new beamsector. This process is also known as cell reselection. As such, the terminal 5 may receive a new beamsector and continue to receive service. For convenience of explanation, it will be assumed that the terminal 5 moves below.

4 illustrates an example in which a terminal moves a beam sector provided by the same AP device. 4 illustrates a terminal 5, an AP device 10, and a mobility management device 30. Referring to FIG. 4, the AP device 10 provides four beam sectors (beam sector 1, beam sector 2, beam sector 3, and beam sector 4) using a polarization / pattern array antenna, and each beam sector is different from each other. Provide a plurality of signals having a radiation pattern. The terminal 5 is currently receiving service from the beam sector 1 (serving beam sector) and is moving to the area served by the beam sector 2.

In order to request a new beamsector allocation, the terminal 5 must measure the strength of a signal provided by the corresponding beamsector. That is, the terminal 5 measures the signal strength of the serving beam sector and the signal strength of another beam sector adjacent to the serving beam sector. In FIG. 4, the terminal 5 may measure the signal strength of the beam sector 1 and the signal strength of the beam sector 2. The terminal 5 measures the strength of the signal is a reference signal. The AP device 10 transmits a reference signal through each beamsector. The reference signal will be described later. The terminal 5 obtains the channel gain for the pattern / polarized antenna array of the serving beamsector and the channel gain for the pattern / polarized antenna array of the peripheral beamsector adjacent to the serving beamsector through the reference signal.

When the mobile station 5 moves and moves the beam sector in the same AP device 10, the terminal 5 may select a pattern / polarization antenna array having excellent channel gain at the beam sector boundary to receive seamless service by utilizing diversity gain. In FIG. 4, if the terminal 5 moves and uses a specific pattern / polarized antenna array of beamsector 2 rather than beamsector 1, the channel gain is excellent, it is preferable to provide a service for the terminal 5 through beamsector 2. Do.

The beamsector selection for the terminal 5 may be basically based on the channel gain (signal strength). In some cases, other criteria or environments may be considered. For example, the beamsector selection may be determined by further considering at least one of the characteristics of the service provided to the terminal, the degree of interference of the beamsector, the availability of the beamsector, and the service provider's policy. However, for convenience of explanation, it is assumed that the beam sector is determined based on the channel gain.

Furthermore, depending on the location of the terminal 5 or the surrounding environment, the terminal 5 may provide a service for the terminal 5 by using both a specific pattern / polarization antenna array of the beam sector 1 and a specific pattern / polarization antenna array of the beam sector 2. . In this case, the AP device 10 should allow a plurality of beam sectors to cooperate with each other to provide a service to the terminal 5.

The mobility management device 30 is a device located in the core network to manage mobility of the terminal 5. The mobility management device 30 may control mobility for the plurality of AP devices 10.

5 is an example of a process flow diagram for a method 100 for determining a beamsector for a terminal in a pattern / polarized BDMA system. FIG. 5 illustrates an example in which the terminal 5 newly receives a beamsector provided by the same AP device 10 as shown in FIG. 4. The AP device 10 transmits the reference signal through the beam sector (110). The terminal 5 located in the coverage of the beam sector measures the signal strength using the reference signal (121). Measuring the strength of a signal is a measure of the channel gain. In this case, the terminal 5 may receive not only the reference signal of the serving beam sector but also reference signals of other adjacent beam sectors and measure the strength of each signal.

The terminal 5 may determine whether the beam sector movement is necessary based on the measured signal strength (122). For example, if the terminal 5 is currently receiving service from the beam sector 1 and it is determined that using a specific pattern / polarization antenna of the adjacent beam sector 2 has a good channel gain, the terminal 5 beams to the AP device 10. The service may be requested to service the sector 2 (130). That is, the terminal 5 requests the AP device 10 to switch (move) the serving beam sector to another beam sector. A beam sector with better channel gain than the current serving beam sector is called a target beam sector. That is, the terminal 5 requests a movement from the serving beam sector to the target beam sector. In some cases, the terminal 5 may determine a beam sector having the best channel gain among the plurality of candidate beam sectors as the final target beam sector. In this case, the terminal 5 may transmit information (identifier, etc.) of the target beam sector to be moved, pattern / polarized antenna array information having excellent channel in the target beam sector, and the like. In summary, the movement request message transmitted by the terminal 5 may include information indicating the movement request, information of the target beamsector, and pattern / polarization antenna array information.

The AP device 10 selects a new serving beamsector and pattern / polarized antenna array based on the information received from the terminal 5 (140). The AP device 10 communicates with the terminal 5 using the beamsector and the pattern / polarization antenna array selected by the AP device 10 (150). In addition, as described above, the AP device 10 may perform communication with the terminal 5 using a plurality of beam sectors cooperatively.

6 is another example of a procedure flow diagram for a method 200 of determining a beamsector for a terminal in a pattern / polarized BDMA system. FIG. 6 illustrates an example in which the terminal 5 newly receives a beamsector provided by the same AP device 10 as shown in FIG. 4. The AP device 10 transmits the reference signal through the beam sector (210). The terminal 5 located in the coverage of the beam sector measures the signal strength using the reference signal (220). Measuring the strength of a signal is a measure of the channel gain. In this case, the terminal 5 may receive not only the reference signal of the serving beam sector but also reference signals of other adjacent beam sectors and measure the strength of each signal.

Unlike FIG. 5, the terminal 5 transmits the strength of a signal measured by the terminal 5 to the AP device without determining whether the beam sector moves. In this case, the terminal 5 may transmit information (identifier, etc.) of the target beam sector to be moved, pattern / polarized antenna array information having excellent channel in the target beam sector, and the like.

The AP device 10 may determine whether the beam sector movement is necessary based on the information (signal strength, etc.) received from the terminal 5 (241). For example, when the terminal 5 is currently receiving service from beamsector 1 and using a specific pattern / polarized antenna of the adjacent beamsector 2 determines that the channel gain is good, the AP device 10 may determine the serving beamsector by beamsector. Can move to 2. In some cases, the AP device 10 may determine a beam sector having the best channel gain among the plurality of candidate beam sectors as the final target beam sector.

The AP device 10 selects a new serving beamsector and pattern / polarized antenna array based on the information received from the terminal 5 (242). The AP device 10 communicates with the terminal 5 using the beamsector and the pattern / polarization antenna array selected by the AP device (250). In addition, as described above, the AP device 10 may perform communication with the terminal 5 using a plurality of beam sectors cooperatively.

7 is another example of a procedure flow diagram for a method 300 of determining a beamsector for a terminal in a pattern / polarized BDMA system. FIG. 7 illustrates an example in which the terminal 5 newly receives a beamsector provided by the same AP device 10 as shown in FIG. 4. The AP device 10 transmits the reference signal through the beam sector (310). The terminal 5 located in the coverage of the beam sector measures the signal strength using the reference signal (320). Measuring the strength of a signal is a measure of the channel gain. In this case, the terminal 5 may receive not only the reference signal of the serving beam sector but also reference signals of other adjacent beam sectors and measure the strength of each signal.

Unlike in FIG. 5, the terminal 5 transmits the strength of the signal measured by the terminal 5 to the AP device without determining whether the beam sector moves. In this case, the terminal 5 may transmit information (identifier, etc.) of the target beam sector to be moved, pattern / polarized antenna array information having excellent channel in the target beam sector, and the like. Unlike in FIG. 6, the AP device 10 transmits information received by the AP device to the mobility management device 30 again without determining whether the beam sector moves. The mobility management device 30 is a device for managing mobility for the terminal 5 serviced by the AP device 10 in the core network. For example, the mobility management device 30 may be an entity such as a mobility management entity (MME) in LTE communication.

The mobility management device 30 may determine whether the beam sector movement is necessary based on the information (signal strength, etc.) received from the terminal 5 via the AP device 10 (341). For example, when the terminal 5 is currently receiving service from beamsector 1 and using a specific pattern / polarized antenna of the adjacent beamsector 2 determines that the channel gain is good, the AP device 10 may determine the serving beamsector by beamsector. Can move to 2. In some cases, the mobility management apparatus 30 may determine a beam sector having the best channel gain among the plurality of candidate beam sectors as the final target beam sector. The mobility management device 30 selects a new serving beamsector and pattern / polarized antenna array based on the information received from the terminal 5 (342).

When the mobility management device 30 determines that the beam sector movement is necessary, the mobility management device 30 transmits information on the newly selected beam sector and the pattern / polarization antenna array to the AP device 10 (350).

The AP device 10 communicates with the terminal 5 using the new beamsector and the pattern / polarization antenna array using the information received from the mobility management device 30 (360). In addition, as described above, the AP device 10 may perform communication with the terminal 5 using a plurality of beam sectors cooperatively.

Hereinafter, a method of operating a reference signal in a reference pattern / polarized BDMA system will be described. In a pattern / polarized BDMA system, the beam sector is divided by using a pattern / polarized antenna array to obtain a spatial division gain. If spatial partitioning is used and the frequency reuse ratio is set to 1 (maximum use of the same frequency band for each beam sector), interference occurs at the beam sector boundary. In such a situation, when the same reference signal is used for each beam sector, interference may occur between the reference signals, thereby making it impossible to accurately estimate the channel. Accordingly, a problem may occur in providing a stable communication service using the reference signal such as mobility support. Therefore, a method for solving the interference problem between adjacent beam sectors may be needed.

8 illustrates an example in which the same AP device transmits a reference signal for each beam sector. The largest interference factor that may occur in a pattern / polarized BDMA system may be interference between beamsectors generated by a pattern / polarized antenna array. 8 illustrates an example in which the AP apparatus 10 provides four beam sectors (beam sector 1, beam sector 2, beam sector 3, and beam sector 4). For example, in FIG. 8, interference with reference signals may occur between beam sector 1 and beam sector 2, beam sector 2 and beam sector 3, beam sector 3, and beam sector 4 that are adjacent to each other. In order to reduce such interference between adjacent beam sectors, a method of avoiding and operating a reference signal is required. FIG. 8 illustrates an example in which reference signals are operated by changing at least one of the same time or frequency (channel) between adjacent beam sectors. Referring to the right side of FIG. 8, the beam sector 1 and the beam sector 3 use the same time or frequency, and the beam sector 2 and the beam sector 4 use the same time or frequency. However, beamsector 1 and beamsector 2, which are adjacent beam sectors, use different times or frequencies. Through this, interference of the reference signal between adjacent beam sectors can be avoided. As a result, FIG. 8 transmits a reference signal without using the same resource region in an adjacent beam sector.

8, the reference signal is used as if frequency reuse. Therefore, the loss on the frequency resources can be seen. As a result, it may be advantageous in terms of resource management that the reference signal be used as little as possible. When creating a beamsector, it is desirable to adjust the reuse rate through the predicted interference.

Many interferences can be eliminated by solving the interference between adjacent beamsectors. However, there is a section in which adjacent beam sectors rest the reference signal by one resource block, so that some damage may be caused in frequency resources. In the case where the reference signal is operated overlapping in the same resource interval in the adjacent beam sector, the channel gain measured may vary depending on which pattern / polarization antenna is transmitted because the radiation characteristics or the propagation path of the pattern / polarization antenna array are different. . Also, in the region where the channel characteristics are excellent for a specific pattern / polarization antenna, the beam sector to which the terminal 5 belongs and the reference signal transmitted from the specific pattern / polarization antenna array used in the adjacent beam sector may cause interference with each other. The chances are high. 9 is another example in which the same AP device transmits a reference signal for each beamsector. 9A illustrates an example in which interference may occur in an adjacent beam sector. In FIG. 9 (a), it is assumed that the channel characteristics of the antenna indicated by "o" among the pattern / polarization antennas used in the beam sector 1 and the beam sector 2 are excellent. In FIG. 9A, "○" is denoted as a dominant pattern. As a result, if the beam sector 1 and the beam sector 2 transmit the reference signal in the same resource block in the situation as shown in FIG. 9 (a), the possibility of interference increases.

As described above, when the reference signal is operated by allocating the same pattern / polarization to the same resource block between adjacent beam sectors in the situation as shown in FIG. Therefore, in this case, different pattern / polarization antennas may be used for overlapping resource blocks in adjacent beam sectors. FIG. 9B illustrates an example in which different pattern / polarization antennas are used for the same resource block in adjacent beam sectors. As shown in FIG. 9 (b), interference may be efficiently removed by operating a pattern signal used in the same resource block for each beam sector differently. Here, the resource block is set based on at least one of frequency or time.

Meanwhile, as described above, the terminal 5 may measure the channel gain using various reference signals. For example, the terminal 5 measures RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality), and when the RSRP or RSRQ of the adjacent beam sector is equal to or greater than a predetermined reference value, the AP device (RSP or RSRQ) is measured. You can report to 10).

When using various reference signals, the beam sector may be selected based on a rank of the channel matrix generated in the beam sector. The transmit power can be represented by constant vectors and matrices. The physical meaning of the rank of the channel matrix is the maximum number that can send different information on a given channel. Therefore, the rank of the channel matrix may be defined as the minimum number among the number of independent rows or columns.

However, when the terminal 5 is located at the boundary of the beam sector, it may not be good to refer to the rank of the channel matrix due to strong interference. If the terminal 5 is subjected to interference between beam sectors, it may perform communication using diversity. Therefore, it may be desirable to determine the beamsector using a normalized matrix value rather than rank. The normalized matrix is an index representing the sum of gains of all channels.

Hereinafter, an example of a case in which the terminal 5 is located at the boundary of the AP device and moves from the serving AP device to coverage of another AP device (handover) will be described. 10 illustrates an example in which the terminal moves to a beam sector provided by another AP device. 10 shows a terminal 5, two

AP devices

10A and 10B and a mobility management device 30. In FIG. 10, the terminal 5 is located at the boundary between the AP device 10A and the AP device 10B. The terminal 5 is located in an area in which the beam sector 4 provided by the AP device 10A and the beam sector 1 provided by the AP device 10B can simultaneously serve. Assume that the current serving AP device is the AP device 10A. In this case, the strength of the reference signal received by the terminal 5 may be evaluated to move the beam sector to beam sector 1 of the AP device 10B. Hereinafter, a process of moving the serving AP device 10A to another adjacent AP device 10B will be described. The AP device 10B to which the terminal 5 will move is called a target AP device.

Meanwhile, in FIG. 10, the AP device 10A and the AP device 10B may be devices having different communication methods. For example, the AP device 10A may be a base station of mobile communication, and the AP device 10B may be an AP of Wi-Fi. In this case, the mobility management device 30 corresponds to a device for managing mobility between heterogeneous networks.

11 is an example of a process flow diagram for a method 400 of supporting mobility for a terminal in a pattern / polarized BDMA system. FIG. 11 illustrates an example in which the terminal 5 newly receives a beam sector provided by different AP devices as shown in FIG. 10. The AP device 10A and the AP device 10B transmit reference signals through the beamsectors 411 and 412. Of course, unlike FIG. 11, the terminal 5 may receive a reference signal from more AP devices.

The terminal 5 measures the signal strength using the reference signal (421). Measuring the strength of a signal is a measure of the channel gain. The terminal 5 may determine whether the beam sector movement is necessary based on the measured signal strength (422). For example, the terminal 5 is currently receiving service through the beam sector 4 provided by the AP device 10A, but using a specific pattern / polarization antenna of the beam sector 1 provided by the adjacent AP device 10B has a channel gain. You can judge that it is good. In this case, the terminal 5 may request the AP device 10A to service the beam sector 1 (target beam sector) of the AP device 10B (431). That is, the terminal 5 requests the AP device 10A to switch (move) the serving beam sector to the beam sector of another AP device 10B.

The terminal 5 includes information (identifier, etc.) of the target AP device to be moved, information about the target beamsector among the beam sectors provided by the target AP device, pattern / polarized antenna array information having excellent channel in the target beamsector, and the like. You can send it together. In some cases, it is preferable that the terminal 5 simultaneously use the specific pattern / polarization antenna of the beam sector 4 provided by the AP device 10A and the specific pattern / polarization antenna of the beam sector 1 provided by the AP device 10B at the same time. You can judge. In this case, the terminal 5 may transmit additional information for cooperative transmission. The information for cooperative transmission may include information on the current service AP, information on the beam sector of the serving AP, and information on a specific pattern / polarized antenna having excellent channel characteristics in the beam sector.

The AP device 10A transmits the information received from the terminal 5 to the AP device 10B serving as the target AP device (432). The current serving AP device 10A may additionally transmit information on the UE (identifier, etc.), information on a channel that the UE is receiving, and information on data to be received by the UE to the target AP device 10B. 432. In addition, when cooperative communication is required, the serving AP device 10A may transmit additional information for the cooperative communication to the target AP device 10B (432).

The AP device 10B selects a new serving beamsector and pattern / polarized antenna array based on the information received from the AP device 10A (440).

When the AP device 10A terminates the service for the terminal 5 and only the AP device 10B serves the terminal 5, the AP device 10B may provide a serving beamsector and a pattern / polarization antenna array provided by the AP device 10B. Communication with the terminal 5 is performed by using 450. It corresponds to the block marked with A in FIG.

Meanwhile, as described above, the AP device 10A and the AP device 10B may cooperate to provide a service to the terminal 5. It corresponds to the block denoted by B in FIG. In this case, the AP device 10A and the AP device 10B must share information for cooperative communication (461). Thereafter, the AP device 10A and the AP device 10B exchange data with the terminal 5 through cooperative beamforming (462). In the cooperative communication, the AP device 10A and the AP device 10B may transmit the same data in duplicate, or the AP device 10A and the AP device 10B may transmit different data. In the latter case, the AP device 10A and the AP device 10B must share information on data to be transmitted and received to each other.

12 is another example of a procedure flow diagram for a method 500 for supporting mobility for a terminal in a pattern / polarized BDMA system. FIG. 12 illustrates an example in which the terminal 5 newly allocates a beam sector provided by different AP devices as shown in FIG. 10. The AP device 10A and the AP device 10B transmit a reference signal through the beam sector (511, 512).

The terminal 5 measures the strength of the signal using the reference signal (521). Measuring the strength of a signal is a measure of the channel gain. Unlike in FIG. 11, the terminal 5 transmits the measured signal strength to the serving AP device 10A without determining whether the beam sector moves or not (530). The terminal 5 includes information (identifier, etc.) of the target AP device that can be moved, information about the target beamsector among the beam sectors provided by the target AP device, and pattern / polarized antenna array information having excellent channels in the target beamsector. And the like can be sent together. In some cases, it is preferable that the terminal 5 simultaneously use the specific pattern / polarization antenna of the beam sector 4 provided by the AP device 10A and the specific pattern / polarization antenna of the beam sector 1 provided by the AP device 10B at the same time. You can judge. In this case, the terminal 5 may transmit additional information for cooperative transmission. The information for cooperative transmission may include information on the current service AP, information on the beam sector of the serving AP, and information on a specific pattern / polarized antenna having excellent channel characteristics in the beam sector.

The AP device 10A may determine whether the beam sector movement is necessary based on the received information (541). For example, the AP device 10A is currently receiving service through the beam sector 4 provided by the AP device 10A, and using a specific pattern / polarization antenna of the beam sector 1 provided by the adjacent AP device 10B uses channel gain. You can judge that this is good. In this case, the AP device 10A may request the AP device 10B to provide a service for the terminal 5 (542). That is, the AP device 10A requests the AP device 10B to provide (move) a beam sector for the terminal 5.

The AP device 10A may additionally transmit information on the UE (identifier, etc.), information on a channel that the UE is receiving, and information on data to be received by the UE to the target AP device 10B (541). ). In addition, when cooperative communication is required, the serving AP device 10A may transmit additional information for the cooperative communication to the target AP device 10B (541).

The AP device 10B selects a new serving beamsector and pattern / polarized antenna array based on the information received from the AP device 10A (550).

When the AP device 10A terminates the connection with the terminal 5 and only the AP device 10B serves the terminal 5, the AP device 10B may provide a serving beamsector and a pattern / polarization antenna array provided by the AP device 10B. In step 560, the terminal 5 communicates with the terminal 5. It corresponds to the block marked with A in FIG.

Meanwhile, as described above, the AP device 10A and the AP device 10B may cooperate to provide a service to the terminal 5. It corresponds to the block denoted by B in FIG. In this case, the AP device 10A and the AP device 10B must share information for cooperative communication (571). Thereafter, the AP device 10A and the AP device 10B exchange data with the terminal 5 through cooperative beamforming (572). In the cooperative communication, the AP device 10A and the AP device 10B may transmit the same data in duplicate, or the AP device 10A and the AP device 10B may transmit different data. In the latter case, the AP device 10A and the AP device 10B must share information on data to be transmitted and received to each other.

13 is another example of a procedure flow diagram for a method 600 of supporting mobility for a terminal in a pattern / polarized BDMA system. FIG. 13 illustrates an example in which a terminal 5 newly allocates a beam sector provided by different AP devices as shown in FIG. 10. The AP device 10A and the AP device 10B transmit reference signals through the beamsectors 611 and 612.

The terminal 5 measures the strength of the signal using the reference signal (621). Measuring the strength of a signal is a measure of the channel gain. Unlike in FIG. 11, the terminal 5 transmits the measured signal strength to the serving AP device 10A without determining whether the beam sector moves (630). The terminal 5 includes information (identifier, etc.) of the target AP device that can be moved, information about the target beamsector among the beam sectors provided by the target AP device, and pattern / polarized antenna array information having excellent channels in the target beamsector. And the like can be sent together. In some cases, it is preferable that the terminal 5 simultaneously use the specific pattern / polarization antenna of the beam sector 4 provided by the AP device 10A and the specific pattern / polarization antenna of the beam sector 1 provided by the AP device 10B at the same time. You can judge. In this case, the terminal 5 may transmit additional information for cooperative transmission. The information for cooperative transmission may include information on the current service AP, information on the beam sector of the serving AP, and information on a specific pattern / polarized antenna having excellent channel characteristics in the beam sector.

Unlike in FIG. 12, the AP device 10A transmits information received by the AP device 10 to the mobility management device 30 without determining whether the beam sector moves. The AP device 10A may additionally transmit information on the UE (identifier, etc.), information on a channel that the UE is receiving, and information on data to be received by the UE to the target AP device 10B (541). ). In addition, when cooperative communication is required, the serving AP device 10A may transmit additional information for the cooperative communication to the target AP device 10B (640).

The mobility management device 30 may determine whether the beam sector movement is necessary based on the received information (651). The mobility management device 30 may select a new serving beamsector and pattern / polarized antenna array based on the information received from the AP device 10A (652).

For example, the AP device 10A is currently receiving service through the beam sector 4 provided by the AP device 10A, and using a specific pattern / polarization antenna of the beam sector 1 provided by the adjacent AP device 10B uses channel gain. You can judge that this is good.

When the mobility management device 30 determines that the AP device 10A terminates the connection with the terminal 5 and that only the AP device 10B should service the terminal 5, the mobility management device 30 moves the beam sector. If it is determined that the information is necessary, information about the newly selected beamsector and the pattern / polarization antenna array is transmitted to the AP device 10B (660). Although not shown in FIG. 13, the mobility management device 30 may inform the AP device 10A of the service termination. The AP device 10B communicates with the terminal 5 using the serving beamsector and the pattern / polarization antenna array provided by the AP device 10B (670). It corresponds to the block marked with A in FIG.

Meanwhile, as described above, the AP device 10A and the AP device 10B may cooperate to provide a service to the terminal 5. It corresponds to the block marked with B in FIG. In this case, when the mobility management apparatus 30 determines that the movement of the beam sector is necessary, the mobility management device 30 transmits information about the newly selected beam sector and the pattern / polarization antenna array to the AP device 10A and the AP device 10B (681, 682). . The AP device 10A and the AP device 10B must share information for cooperative communication (691). Thereafter, the AP device 10A and the AP device 10B exchange data with the terminal 5 through cooperative beamforming in operation 692. In the cooperative communication, the AP device 10A and the AP device 10B may transmit the same data in duplicate, or the AP device 10A and the AP device 10B may transmit different data. In the latter case, the AP device 10A and the AP device 10B must share information on data to be transmitted and received to each other.

14 illustrates an example in which different AP devices transmit reference signals for beam sectors. 14 illustrates an example of a method in which a plurality of

adjacent AP devices

10A and 10B operate a reference signal. 14 is an example for avoiding interference between adjacent beam sectors in the same manner as in FIG. 8. FIG. 14 illustrates an example in which reference signals are operated by changing at least one of the same time or frequency (channel) between adjacent beam sectors. Referring to the right side of FIG. 14, the beam sector 4 of the AP device 10A adjacent to each other and the beam sector 1 of the AP device 10B use different times or frequencies. Through this, interference of the reference signal between adjacent beam sectors can be avoided.

15 illustrates another example in which different AP devices transmit reference signals for beam sectors. 15 is an example of how a plurality of

adjacent AP devices

10A and 10B operate a reference signal. FIG. 14 is an example for avoiding interference between adjacent beam sectors in the same manner as in FIG. 9. FIG. 14 illustrates an example in which different pattern / polarization antennas are used for a resource block used in a beam sector 4 of an AP device 10A, which is an adjacent beam sector, and a beam sector 1 of an AP device 10B. As shown in FIG. 14, interference may be efficiently removed by operating a pattern signal used in the same resource block for each beam sector differently. Here, the resource block is set based on at least one of frequency or time.

The embodiments and the drawings attached to this specification are merely to clearly show a part of the technical idea included in the above-described technology, and those skilled in the art can easily make it within the scope of the technical idea included in the above-described technology and drawings. It will be apparent that both the inferred modifications and the specific embodiments are included in the scope of the above-described technology.

Claims

Measuring, by the terminal, signal strength of at least one beamsector transmitted from the AP device;

Transmitting, by the terminal, the signal strength to the AP device; And

And providing, by the AP device, a service for the terminal with a target beamsector determined based on the signal strength.
The method of claim 1,

The terminal determines the beam sector for the terminal in the BDMA system for measuring the signal strength of the serving beam sector that is currently being serviced and the signal strength of at least one other beam sector located around the serving beam sector.
The method of claim 1,

The AP device may select any one of the at least one beam sector based on at least one of a signal strength value, a characteristic of a service provided to the terminal, an interference degree of a beam sector, an availability of a beam sector, and a policy of a service provider. A method of determining a beam sector for a terminal in a BDMA system that determines the target beam sector.
The method of claim 1,

Forwarding, by the AP device, the signal strength to a mobility management device located in a core network;

Any one of the at least one beam sector based on at least one of a signal strength value, a characteristic of a service provided to the terminal, a degree of interference of a beam sector, an availability of a beam sector, and a policy of a service provider; Determining as the target beamsector; And

And transmitting, by the mobility management device, information about the target beamsector to the AP device.
The method of claim 1,

The signal strength refers to a channel gain, and the target beamsector is a beam for a terminal in a BDMA system that is determined based on a rank of a channel matrix representing the channel gain or a sum of gains of the channel matrix. How to determine the sector.
The method of claim 1,

The AP device provides a plurality of beams to the beamsector using at least one of a pattern antenna and a polarization antenna, and multiple-input multiple-output (MIMO) communication or multiplexing with the terminal using the plurality of beams -Input Single-Output) A method for determining the beam sector for the terminal in a BDMA system performing communication.
The method of claim 1,

The AP apparatus provides a plurality of beamsectors, and beamsectors for a UE in a BDMA system in which adjacent beamsectors of the plurality of beamsectors transmit a reference signal that is a measurement target of the signal strength by varying time or frequency. How to determine.
The method of claim 1,

The AP device provides resources to the beamsector using at least one of a pattern antenna and a polarization antenna,

Adjacent beamsectors of the plurality of beamsectors use a beamsector for a UE in a BDMA system that transmits a reference signal, which is a measurement target of the signal strength, using different patterns or polarizations in the same resource block on a time or frequency basis. How to decide.
The method of claim 1,

And determining, by the terminal, the target beamsector based on the signal strength, and transmitting information about the target beamsector to the AP device.
The method of claim 1,

The AP device provides a resource for the terminal using at least one of a pattern antenna and a polarization antenna,

The terminal further transmits information on the target beamsector and information on at least one of a pattern antenna or a polarization antenna whose gain is greater than or equal to a reference value in the target beamsector to the AP device.

And determining, by the AP device, the beamsector for the terminal in the BDMA system that selects the at least one antenna to provide the target beamsector with the terminal.
Measuring, by the terminal, signal strength of beamsectors respectively transmitted from a plurality of AP devices;

Transmitting, by the terminal, the signal strength to a serving AP device which is an AP device currently providing a service among the plurality of AP devices;

A target beamsector determined by the serving AP device based on information about the terminal to a target AP device which is an AP device determined based on the signal strength among the plurality of AP devices, and the signal strength among beam sectors provided by the target AP; Delivering information about the target AP device; And

And providing, by the target AP device, a service for the terminal to the target beamsector.
The method of claim 11,

The UE measures the signal strength of the serving beam sector currently being serviced by the serving AP device and the signal strength of at least one beam sector provided by the target AP device.
The method of claim 11,

The AP device determines the target AP device and the target beamsector based on at least one of a signal strength value, a characteristic of a service provided to the terminal, an interference degree of a beamsector, an availability of a beamsector, and a policy of a service provider. The mobility support method for the terminal in the BDMA system to determine.
The method of claim 11,

The at least one beam based on at least one of a signal strength value, a characteristic of a service provided to the terminal, a degree of interference of a beam sector, an availability of a beam sector, and a policy of a service provider by a mobility management device located in a core network Determining the target AP device and the target beamsector based on any one of the sectors, and transmitting the information about the target AP device and the information about the target beamsector to the serving AP device. The mobility support method for the terminal in the.
The method of claim 11,

The signal strength refers to a channel gain, and the target beamsector is mobility to a terminal in a BDMA system determined based on a rank of a channel matrix representing the channel gain or a sum of gains of the channel matrix. Support room
The method of claim 11,

The serving AP device and the target AP device provide a plurality of beams to the beamsector using at least one of a pattern antenna and a polarization antenna, and multiple-input multiple-output (MIMO) with the terminal using the plurality of beams. A mobility support method for a terminal in a BDMA system that performs communication or multiple-input single-output (MIS) communication.
The method of claim 11,

A neighboring beamsector of a beamsector provided by the serving AP device and a beamsector provided by the target AP device transmits a reference signal, which is a measurement target of the signal strength, by varying time or frequency, with respect to a mobile station. How to apply.
The method of claim 11,

The serving AP device and the target AP device provide a resource to the beam sector using at least one of a pattern antenna and a polarization antenna,

A beam sector adjacent to each other among the beam sector of the serving AP device and the beam sector of the target AP device transmits a reference signal to be measured for the signal strength using different patterns or polarizations in the same resource block on a time or frequency basis. Mobility support method for UE in BDMA system
The method of claim 11,

The terminal may further include determining the target AP device and the target beamsector based on the signal strength, and transmitting the information about the target AP device and the information about the target beamsector to the serving AP device. Method of supporting mobility for UE in BDMA system.
The method of claim 11,

The serving AP device transmits information for cooperative transmission to the target AP device, and the serving AP device and the target AP device cooperate with each other to provide a service to the terminal.