KR102560875B1 - Distributed multi-points coordinated dynamic cell configuration method - Google Patents

Abstract

A device that manages a plurality of TPs (Transmission Points) forms one spot coverage with sector coverage formed by two or more TPs in different locations, logically groups a plurality of virtual spot coverages formed within the entire area coverage, constitutes at least one cell. At this time, coverage formed by one TP is divided into a plurality of sector coverages, and the entire area coverage is formed by coverage by the plurality of TPs.

Description

DISTRIBUTED MULTI-POINTS COORDINATED DYNAMIC CELL CONFIGURATION METHOD}

The present invention relates to a method for constructing a distributed multi-point coordinated dynamic cell in a mobile communication system.

Currently, three major methods are being considered for increasing capacity to prepare for an explosion in mobile traffic in a mobile communication system. The first is to increase spectral efficiency of frequencies, the second is to increase the frequency used, and the third is to densify small cells.

In the approach of the third method, the approach of densifying the small cell based on the technology and operation of the existing cellular communication system can increase the overall system capacity. However, due to inter-cell interference, low capacity is provided to terminals at the cell edge and high capacity is provided to terminals in the center of the cell, resulting in inequality in terms of capacity provision according to the location of the terminal. The frequency of handover increases in proportion to the movement speed, and there is a problem in that continuity of a service requiring a high capacity cannot be guaranteed. In other words, cell densification based on technology and operation of an existing cellular communication system causes capacity inequality according to the location of a terminal, worsens mobility performance, and cannot guarantee service continuity.

The problem to be solved by the present invention is to provide a distributed multi-point coordinated dynamic cell configuration method capable of resolving capacity inequality and mobility performance deterioration according to terminal location due to cell densification and guaranteeing service continuity.

According to an embodiment of the present invention, a method for configuring a distributed multi-point coordinated dynamic cell in an apparatus for managing a plurality of transmission points (TPs) is provided. The distributed multi-point cooperative dynamic cell configuration method comprises the steps of forming one spot coverage with sector coverage formed by two or more TPs in different locations, and logically grouping a plurality of virtual spot coverages formed within the entire area coverage to and configuring at least one cell, wherein coverage formed by one TP is divided into a plurality of sector coverages, and the entire area coverage is formed by coverages by the plurality of TPs.

According to an embodiment of the present invention, in the case of processing antennas (or TPs (Transmission Points)) that are distributed and arranged locally in one central processing unit, the bandwidth of a broadband system is divided into several subbands and operated, and By selecting various grouping methods by using the coverages of each antenna for each station as the minimum unit and changing the grouping method for each sub-band, the system is adaptively operated according to the space-time requirements of interference, mobility, and capacity, ensuring mobility of the terminal and improving coverage. It can expand and provide appropriate capacity according to the location and mobility of the terminal.

1 is a diagram illustrating an example of a structure of a cloud base station according to an embodiment of the present invention.
2 is a diagram showing an example of an antenna distributed arrangement structure according to an embodiment of the present invention.
FIG. 3 is a diagram showing coverage that can be formed by antennas of each DU shown in FIG. 2 .
FIG. 4 is a diagram illustrating coverage for each sub-band according to the distributed antenna arrangement structure shown in FIG. 2 .
5 is a diagram illustrating a dynamic cell configuration according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an example in which the dynamic cell configuration shown in FIG. 5 is configured differently for each subband.
7 is a diagram illustrating an example of an active cell within full area coverage according to an embodiment of the present invention.
8 is a diagram illustrating another example of a cell configuration in the same antenna distribution arrangement structure as in FIG. 2 .
9 and 10 are diagrams each illustrating an example of solving radio wave failure with the cell configuration shown in FIG. 8 .
11 is a diagram illustrating a movement path of a terminal according to an embodiment of the present invention.
12 is a diagram illustrating an example of a history in which a movement path of a terminal is recorded.
13 is a diagram illustrating a method of allocating UE-specific resources according to UE tracking scheduling according to an embodiment of the present invention.
14 is a diagram illustrating an example of a UE tracking scheduling bitmap according to an embodiment of the present invention.
15 is a diagram illustrating an example of UE tracking bit information according to an embodiment of the present invention.
16 is a diagram illustrating a resource management method according to UE tracking scheduling according to an embodiment of the present invention.
17 is a diagram illustrating an example of a power-based dynamic cell configuration according to an embodiment of the present invention.
18 is a diagram illustrating another example of a power-based dynamic cell configuration according to an embodiment of the present invention.
19 and 20 are diagrams each illustrating another example of a power-based dynamic cell configuration according to an embodiment of the present invention.
21 is a diagram showing an example of an antenna according to an embodiment of the present invention.
22 is a diagram illustrating an apparatus for configuring a distributed multi-point cooperative dynamic cell according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification and claims, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Throughout the specification, a terminal includes a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), and a high reliability mobile station (HR-MS). , subscriber station (SS), portable subscriber station (PSS), access terminal (AT), user equipment (UE), etc., and may refer to MT, MS, AMS , HR-MS, SS, PSS, AT, UE, etc. may include all or some functions.

In addition, a base station (BS) includes an advanced base station (ABS), a high reliability base station (HR-BS), a node B, and an evolved node B (eNodeB). ), access point (AP), radio access station (RAS), base transceiver station (BTS), mobile multihop relay (MMR)-BS, relay station serving as a base station , RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, and a high reliability relay station (HR- RS), small base stations (femto BS, home node B (HNB), home eNodeB (HeNB), pico BS, metro BS, micro BS) etc.], etc., and may include all or some functions of ABS, NodeB, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR-RS, small base station, etc. .

Now, a method for constructing a distributed multi-point cooperative dynamic cell according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating an example of a structure of a cloud base station according to an embodiment of the present invention.

Referring to FIG. 1, in a mobile communication system including long-term evolution (LTE), each base station is divided into a radio signal processing unit (Radio Unit, RU) and a digital signal processing unit (Digital Unit, DU), and the RU is divided into a plurality of It distributes and manages DUs centrally in one place. Accordingly, a radio unit (RU) pool, a digital unit (DU) pool, and a RU-DU mapper for mapping RUs and DUs exist in the physical infrastructure layer. RUs of the RU pool are distributed and arranged, DUs of the DU pool are connected to each other, and control at least one RU connected to one DU. The RU-DU mapper connects each other by mapping a specific RU and a specific DU. The RU may be equipped with only an antenna and may perform a PHY or MAC function. The RU may have macro cell, micro cell, and pico cell coverage through power control, and may have individual coverage of macro cell, micro cell, and pico cell. there is. In addition, the antenna mounted on the RU may be an omnidirectional antenna, a directional antenna, or several beamforming antennas.

Several virtual base stations (VBS) may be created in the logical layer through the virtualization layer, or one huge server base station (server VBS) may be created. That is, a logical virtual base station (VBS) having the same function as an existing base station can be created by selecting a specific RU and a specific DU and connecting them by the RU-DU mapper, and not only these several small virtual base stations (VBS) A large-scale server virtual base station can be created to reduce interference and increase systemic capacity through cooperative radio.

2 is a diagram showing an example of an antenna distributed arrangement structure according to an embodiment of the present invention.

Referring to FIG. 2, a plurality of (eg, 57) RUs each equipped with an antenna are distributed, and at least one DU for processing the plurality of RUs in the DU pool can be selected according to the temporal and spatial loads. there is. That is, the selected DUs can centrally process a plurality of distributed RUs.

FIG. 3 is a diagram showing coverage that can be formed by antennas of each DU shown in FIG. 2 .

Referring to FIG. 3, the antenna of each DU may have a minimum coverage and a maximum coverage. Dmin is the minimum coverage radius that prevents one antenna from overlapping with the coverage of a neighboring antenna, and Dmax means the maximum coverage radius that one antenna can increase when coverage is increased by increasing antenna power. Hereinafter, coverage that can be formed by one antenna is referred to as spot coverage.

The overall system bandwidth (overall system BW) used by one antenna to form such spot coverage can be divided into a plurality of subbands ((FA1, FA2, FA3, FA4, FA5, FA6, FA7, FA8) and operated. At this time, the bandwidth of one subband is called unit system bandwidth (unit system BW).

FIG. 4 is a diagram illustrating coverage for each sub-band according to the distributed antenna arrangement structure shown in FIG. 2 .

Referring to FIG. 4 , since one spot coverage by one antenna is divided into eight subbands, it can be treated as a total of eight spot component carrier coverages. Therefore, when considering the coverage according to the distributed antenna arrangement shown in FIG. 3 as one group coverage, one group coverage has 57 spot component carrier coverages per subband, and one spot coverage has 8 spot component carrier coverages. Since it has , one group coverage has a total of 456 spot component carrier coverages.

5 is a diagram illustrating a dynamic cell configuration according to an embodiment of the present invention.

57 spot component carrier coverages belonging to a specific subband may be grouped as shown in FIG. 5 . Grouping means that even antennas that are regionally different (hereinafter referred to as transmission points (TPs)) are treated as one cell.

Referring to FIG. 5, (A) configures one cell by grouping 57 spot component carrier coverages belonging to a specific subband into one group. Similar to the existing sector concept, (B) and (C) constitute three cells by grouping 19 spot component carrier coverages into one group. In this case, as in (B) and (C), 19 spot component carrier coverages may be grouped differently in position. In (D), 3 cells are configured by grouping 9 spot component carrier coverages, and 3 cells are configured by grouping 10 spot component carrier coverages. In (E), 6 cells are configured by grouping 9 spot component carrier coverages, and 1 cell is configured by grouping 9 spot component carrier coverages. In (F), 15 spot component carrier coverages are grouped to form three cells, and 12 spot component carrier coverages are grouped to form one cell. In (G), 5 cells are configured by grouping 9 spot component carrier coverages, and 1 cell is configured by grouping 12 spot component carrier coverages. In (H), one spot component carrier coverage constitutes one cell. (I) consists of 19 cells by grouping 3 spot component carrier coverages, (J) configures 1 cell by grouping 3 spot component carrier coverages, and groups 9 spot component carrier coverages to form 1 cells, 15 spot component carrier coverages are grouped to form one cell, and 10 spot component carrier coverages are grouped to form one cell. The cell configuration shown in (J) shows a donut-shaped cell configuration.

Such a grouping cell is a cell configuration of a new concept that did not exist in fact. Assuming that a plurality of TPs (for example, 57) can be processed locally in one place, it is possible to group one TP or a plurality of TPs as shown in FIG. 5 and operate them as one cell. there is. Considering the entire group coverage (i.e., coverage composed of 57 TPs) as an existing macro cell, spot component carrier coverages belonging to a specific subband in all TPs can be operated like an omni cell through logical grouping ( As shown in B) and (C), sector cells with similar concepts to existing sectors may be operated, and various types of cells different from the existing concepts may be dynamically configured.

Also, a plurality of TPs may not be arranged at regular distances and intervals. For example, a plurality of TPs may be irregularly arranged at appropriate locations without coverage holes, and as shown in FIG. 5 , the grouped cells may also be composed of amorphous cells rather than pentagonal groupings. In the embodiment of the present invention, TPs that are regularly fixed and arranged are described to help understanding of the description. Coverage provided by combining spot coverages provided by 57 TPs in a specific subband is referred to as overall coverage. Assume that the peak capacity of one spot component carrier coverage in a specific subband is 1.

When one TP constitutes one cell as shown in (H) shown in FIG. 5, the theoretical peak capacity of the entire area coverage becomes 57. However, because the interference between cells is large, it is difficult to systematically provide the actual theoretical peak capacity, and the user is more likely to be located at the edge of a cell with large interference. The average provisioned capacity for the worst case user of is relatively low. In addition, frequent handovers occur when users move at high speed, and the performance of handovers (Early HO, Late HO, Wrong HO) is lowered, and the frequency of radio link failure (RLF) recovery due to this is also it becomes a lot

On the other hand, when grouped in a large scale as shown in (A) of FIG. 5, the capacity that a specific subband can theoretically provide for the entire area coverage is 1, not 57, and the capacity is 1/57 of that of (H). decreases to the level of However, since frequent handover does not occur when the user moves at high speed and handover within the entire area coverage is eliminated, the handover performance is naturally higher than that of (H) and the frequency of RLF recovery is also lowered.

FIG. 6 is a diagram illustrating an example in which the dynamic cell configuration shown in FIG. 5 is configured differently for each subband.

In FIG. 6, "57/01" means that one cell is operated within the entire area coverage by grouping 57 spot component carrier coverages as shown in (A) of FIG. Type 1 (type 1) and type 2 (type 2) of "19/03" group 19 spot component carrier coverages as shown in (B) and (C) of 5, respectively, and operate 3 cells within the entire area coverage. it means. As shown in (H) of FIG. 5, "01/57" means that each of the spot component carrier coverage constitutes one cell, and 57 cells are operated within the entire area coverage. As such, "x/y" indicates that y cells are operated within the entire area coverage by grouping x spot CC coverages.

As shown in FIG. 6, a cell configuration may be different for each subband. For example, in the sub-band FA1, a cell according to "57/01" is configured within the entire area coverage, and in the sub-band FA2, a cell is configured according to the type 1 of "19/03" within the entire area coverage, , in the sub-band FA3, a cell according to type 2 of "19/03" is configured within the entire area coverage. In the subband (FA4), cells are configured according to "09/03" and "10/03" within the entire area coverage, and in the subband (FA5), cells are configured according to "09/06" and "03/01" within the total area coverage. Accordingly, cells are configured, and in the sub-band FA6, cells are configured according to "15/03" and "12/01" within the entire area coverage. In the sub-band FA7, a cell is configured according to "03/19" within the entire area coverage, and in the sub-band FA8, a cell is configured according to "01/57" within the entire area coverage.

As such, the subbands (FA1, FA2, FA3, FA4, FA5, FA6, FA7, FA8) are listed from top to bottom, and each subband (FA1, FA2, FA3, FA4, FA5, FA6, FA7, FA8) When the cell configuration of ) is determined as shown in FIG. 6, the fact that the grouping scale increases upward and decreases downward means that the interference region decreases upward and increases downward. Additionally, from the capacity point of view, it can be seen that the overall system capacity decreases as it goes up and the overall system capacity increases as it goes down.

Here, "57/01" is very advantageous in terms of mobility because it operates 57 spot component carrier coverages as one cell. Therefore, in a form in which all terminals always access the cell of the sub-band FA1 as an anchor, the sub-band FA1 may be in charge of a function of a coverage layer. The remaining subbands (FA2 to FA8) can be used as a capacity layer to select and access a capacitor layer cell capable of providing optimal capacity according to the mobility of the UE and the system load.

Type 1 and Type 2 of "19/03" have the same grouping method, but the locations of grouped spot component carrier coverages are different. Therefore, in the process of selecting (B) or (C) when providing capacity by connecting cells in the capacitor layer, a cell of a subband with the least interference at the current location of the UE can be selected. However, in such a dynamic cell configuration and method for each sub-band, it is not necessary to limit a coverage layer for generating a virtual macrocell effect to only one sub-band, and the coverage layer can be operated in different sub-bands. In addition, one or more grouping cells in one subband corresponding to the coverage layer may be operated to provide the function of the coverage layer. That is, when two grouping cells are operated to provide functions of two coverage layers, the two grouping cells may be grouping cells of the same subband or may be grouping cells of different subbands.

7 is a diagram illustrating an example of an active cell within full area coverage according to an embodiment of the present invention.

Referring to FIG. 7 , some of cells grouped into spot component carrier coverages may be deactivated in some cases. If the system capacity required in the coverage of 57 spot component carriers within the total area coverage is not large, only cells that are not adjacent to each other may be activated in consideration of interference. That is, when the subbands FA3, FA4, FA5, and FA7 have a cell configuration as shown in (I) of FIG. 5, as shown in (E), the number of subbands FA3, FA4, FA5, and FA7 If the cells are activated so that the activated cells do not overlap each other, the cells can be operated so that there is no interference with each other in the subbands FA3, FA4, FA5, and FA7. Of course, cells for each sub-band may be activated/deactivated so that some overlap occurs.

In this way, various types of cell configurations are possible in consideration of interference, capacity, mobility of the UE, and the like. These various cell configuration methods are not fixed and can be dynamically changed. For example, cells in the coverage layer can be always activated, and cells in the capacity layer can be activated sequentially as the load continues, and all terminals using cells corresponding to the capacity layer of a specific subband can be activated in different capacities. After moving to the city layer or the coverage layer and reconfiguring the cells of that layer, it is possible to dynamically configure the terminal to use the cells of that layer again. Even terminals in a coverage layer may be moved to another layer and then dynamically configured to use that layer again.

8 is a diagram illustrating another example of a cell configuration in the same antenna distribution arrangement structure as in FIG. 2 .

One TP (antenna) may have an omni-directional radiation pattern, but may also have a directional radiation pattern. That is, spot coverage by one TP can be divided into a plurality of sector coverages due to the directional radiation pattern of the TP. For example, when spot coverage by one TP is divided into three sector coverages, sector coverages of three TPs in different locations may be gathered to form one spot coverage.

As shown in FIG. 8 , three TPs may be gathered to form one spot coverage such as a dotted line. Spot coverages formed in this way may be operated according to the concept of FIGS. 5, 6, and 7. That is, 3 TPs can be gathered to form virtual spot coverage, and each of these virtual spot coverages can be composed of 8 spot component carrier coverages according to 8 sub-bands as described above. Therefore, the 57 spot component carrier coverages belonging to each subband can be operated as a grouped cell as shown in FIG. 5, or can have different cell configurations for each subband as shown in FIG. 6, and as shown in FIG. Cells grouped based on capacity and the like may be activated or deactivated.

On the other hand, the higher the operating frequency, the more vulnerable to blockage. Radio wave interference between the TP and the user may include objects caused by movement of buildings, people, buses, etc., radio interference caused by the user's hand, and radio interference caused by the user's rotation. If such radio wave interference occurs at a high frequency, a rapid change in channel quality occurs and communication is immediately cut off. However, when spot coverage is formed by a plurality of TPs as shown in FIG. 8, since paths in different directions are formed by each TP, the above-mentioned radio wave failure can be prevented.

9 and 10 are diagrams each illustrating an example of solving radio wave failure with the cell configuration shown in FIG. 8 .

Referring to FIG. 9 , when one spot coverage is formed by TP1, TP2, and TP3, user A can simultaneously receive data through links 1, 2, and 3 formed with TP1, TP2, and TP3, respectively. At this time, even if radio wave failure occurs in link 1 by user B, the data of TP1 can be transmitted to user A through TP2 and TP3 through cooperation between TP1, TP2, and TP3. In addition, if TP1, TP2, and TP3 transmit in a joint transmission (JT) technique, data can be transmitted to user A through TP2 and TP3 even if a radio wave failure occurs in link 1.

Referring to FIG. 10 , when one spot coverage is formed by TP1, TP2, and TP3, even if the radio quality of link 1 and link 2 deteriorates due to user A's rotation, radio quality can be secured by link 3. If data transmission/reception is performed only from link 1, link 1 may be disconnected due to user A's rotation, and in this case, measures may be taken to resume data transmission/reception through link 3.

11 is a diagram showing a movement path of a terminal according to an embodiment of the present invention, and FIG. 12 is a diagram showing an example of a history in which a movement path of a terminal is recorded.

As shown in FIG. 11, when the terminal moves through cells 1, 3, 5, 7, 8, 9, 10, 11, 12, and 13 within the entire area coverage of a specific subband FA7, As shown in FIG. 12, the actual movement path of the terminal is recorded in the residence cell history.

13 is a diagram illustrating a method of allocating UE-specific resources according to UE tracking scheduling according to an embodiment of the present invention.

A DU that manages spot component carrier coverage within the entire area coverage of a specific subband FA7 transmits UE tracking bit information and UE specific resource information to be allocated to the corresponding UE. The UE tracking bit information and UE-specific resource information to be allocated to the corresponding UE may be transmitted through the control region of the subframe. And the DU transmits the UE tracking scheduling bitmap to the UE. The UE tracking bit indicates a subband to perform UE tracking scheduling. UE tracking scheduling is a method of allocating resources so that UE-specific resources allocated to the UE can be continuously used regardless of movement of the UE. The terminal tracking bit information may be included in a medium access control (MAC) control element (CE), which is a control message generated by the MAC layer, and transmitted to the terminal through a control region. Alternatively, the UE tracking bit information may be transmitted to the UE using a Radio Network Temporary Identifier (RNTI). For example, when the RNTI uses 16 bits, the DU can use 17-bit RNTI by extending 1 bit. At this time, the extended 1 bit is used as terminal tracking bit information. In this case, if the value of the extended 1-bit is 1, it may indicate UE tracking scheduling.

The UE decodes the control region and sets a subband for UE tracking scheduling based on the UE tracking bits allocated to the UE. Next, the UE uses a UE-specific resource allocated to the UE among resources of a subband to perform UE tracking scheduling in a time interval (subframe) designated by 1 in the UE tracking scheduling bitmap.

14 is a diagram illustrating an example of a UE tracking scheduling bitmap according to an embodiment of the present invention.

Referring to FIG. 14, each bit of the UE tracking scheduling bitmap is mapped to each subframe from the start of a system frame number (SFN). The SFN start time may indicate, for example, the start time of subframe 0 of frame 0. If a bit is set to 1 in the UE tracking scheduling bitmap, the UE uses UE-specific resources allocated to the UE in the corresponding subframe. The UE tracking scheduling bitmap may be transmitted to the UE through a Radio Resource Control (RRC) message. The UE tracking scheduling bitmap may be transmitted through L2 signaling or delivered through a control region of a subframe.

15 is a diagram illustrating an example of UE tracking bit information according to an embodiment of the present invention.

Referring to FIG. 15, each bit of UE tracking bit information is mapped to each subband. The bit is set to 1, indicating that UE tracking scheduling is applied to the corresponding subband. For example, when the UE tracking bit information is 00000010, UE tracking scheduling is applied to the subband (FA7) corresponding to bit 1, and the UE is assigned a time interval (subframe) designated by 1 in the UE tracking scheduling bitmap. In , UE-specific resources of the subband FA7 are used. Such UE tracking bit information may be transmitted to the UE through the MAC CE.

Meanwhile, release of UE tracking scheduling of a subband to perform UE tracking scheduling may be performed through UE tracking bit information through a control region. For example, by setting a bit corresponding to a subband to be released from UE tracking scheduling to 0, UE tracking scheduling of the corresponding subband can be released.

As a result, when a UE accessing a cell of a specific subband (eg FA7) has a bit representing the corresponding subband (eg FA7) set to 1 through the control region, 1 is displayed in the UE tracking scheduling bitmap. In the time interval set to , the UE-specific resource allocated to the UE is used. Meanwhile, if a bit indicating a subband accessed by the terminal is set to 0 from the terminal tracking bit information of the control region in the time interval designated as 1 in the terminal tracking scheduling bitmap, the terminal-specific resource can be released.

16 is a diagram illustrating a resource management method according to UE tracking scheduling according to an embodiment of the present invention.

Referring to FIG. 16 , the actual movement path of the terminal is recorded in the residential cell history. A DU that manages spot element carrier coverages within the entire area coverage of a specific subband (FA7) basically instructs to reserve UE-specific resources for neighboring cells in Tier 1 centering on the resident cell. there is. That is, in the basic reserved cell history, neighboring cells in Tier 1 centering on the current resident cell of the UE, which has instructed UE-specific resource reservation, are recorded. For example, if the UE is located in the current cell 1, the DU is allocated to the UE by considering the mobility of the UE from neighboring cells 2, 3, a, b, and c in Tier 1 of the cell 1. Reservation of UE-specific resources to be used is instructed, and corresponding neighbor cells (2, 3, a, b, and c) use the reserved UE-specific resources only for the corresponding UE.

In the case of downlink, the DU transmits data only to the TP of the current resident cell, and resources may not be allocated to Tier 1 neighbor cells so as not to cause interference. In addition, the DU may provide an SINR improvement effect by JT by replicating data to be transmitted to the TP of the current resident cell and delivering the data to the 1-tier neighbor cell.

In the case of uplink, in principle, if the UE transmits data only with resources allocated to the resident cell, the DU can process data with the resources of the corresponding cell, and can use the resources of tier 1 neighboring cells, Uplink quality through joint reception (JR) may be improved by combining data of neighboring cells.

On the other hand, when a neighbor cell in Tier 1 centering on the current residence cell of the UE reserves UE-specific resources, resources are wasted in cells where the UE does not actually move. Therefore, in order to reduce resource waste, the DU predicts the movement path of the UE using measurement information (Measurement Report, CQI, SRS, etc.) transmitted by the UE, location information, measurement information measured by the DU, and speed information of the UE. can Accordingly, the DU may instruct a neighboring cell to reserve resources based on the predicted movement path of the UE. Neighboring cells instructing resource reservation based on the movement path of the terminal are recorded in the precise reservation history. For example, when the terminal is located in the current cell 1, it may be instructed to reserve terminal-specific resources only in neighboring cells 2 and 3 in which the terminal has a high probability of moving based on a predicted movement path of the terminal. By doing this, since the UE-specific resources can be used for other UEs or other purposes in the neighboring cells (a, b, c), resource waste can be reduced.

17 is a diagram illustrating an example of a power-based dynamic cell configuration according to an embodiment of the present invention. In FIG. 17, only TP1, TP2, and TP3 are shown for convenience of description in the cell configuration according to (A) of FIG. 5 for a specific subband (eg, FA7).

Referring to FIG. 17 , when one cell is configured by grouping 57 spot component carrier coverages for a specific subband (eg, FA7), each TP can operate transmit power differently. For example, TP1 located in the center of the grouping cell can increase its transmission power so that the spot coverage of TP1 can be maximized without exceeding the entire area coverage, if possible, and TP3 located in the border area of the grouping cell can achieve the originally planned spot coverage of TP3. Fix transmit power to form coverage. Meanwhile, TP2 located between the center region and the border region of the grouping cell may adjust transmit power so that the spot coverage of TP2 is greater than that of TP3 and less than that of TP1 without exceeding the total area coverage. Such adjustment of transmission power does not cause interference and has an effect of improving radio quality in a grouping cell area.

18 is a diagram illustrating another example of a power-based dynamic cell configuration according to an embodiment of the present invention. 18 shows only TP1, TP2, and TP3 in the cell configuration according to (B) of FIG. 5 for a specific subband (eg, FA7).

Referring to FIG. 18, when 57 spot component carrier coverages for a specific subband (eg, FA7) are grouped into 19 spot component carrier coverages and three cells are configured within the entire area coverage, each cell Within the TP, each TP can operate transmit power differently. For example, TP1 located in the center of cell A can increase its transmission power so that the spot coverage of TP1 becomes as large as possible without departing from the coverage of cell A, if possible, and the TP3 in the border area of cell B has the originally planned spot coverage of TP3 Fix the transmit power to form In addition, TP2 located between the center area and the border area of cell B can adjust transmission power such that the spot coverage of TP2 is greater than that of TP3 and less than that of TP1 without departing from the coverage of cell B. Such adjustment of transmission power does not cause interference and has an effect of improving radio quality in a grouping cell area.

As shown in FIGS. 17 and 18, TPs in the grouping cell can improve radio quality in the grouping cell area by adjusting coverage through transmission power so as not to deviate from the boundary of the grouping cell area according to their respective positions.

19 and 20 are diagrams each illustrating another example of a power-based dynamic cell configuration according to an embodiment of the present invention. In FIG. 19, when three TPs are gathered to form one spot coverage as shown in FIG. 8, TP1, TP1 in the cell configuration according to (A) of FIG. Only TP2 and TP3 are shown. In FIG. 20, when three TPs gather to form one spot coverage as shown in FIG. 8, TP1, TP1 in the cell configuration according to (B) of FIG. Only TP2 and TP3 are shown.

Referring to FIG. 19 , when one cell is configured by grouping all spot component carrier coverages for a specific subband (eg, FA7), each TP can operate transmit power differently. At this time, each TP forms sector coverage unlike FIG. 17 . For example, TP1 located in the center of a grouping cell can increase transmission power so that the sector coverage of TP1 becomes as large as possible without departing from the entire area coverage, if possible, and TP3 located in the boundary area of the grouping cell has the originally planned sector coverage of TP3. Fix transmit power to form coverage. Meanwhile, TP2 located between the center region and the border region of the grouping cell may adjust transmit power so that the sector coverage of TP2 is larger than that of TP3 and smaller than that of TP1 without exceeding the entire region coverage. Such adjustment of transmission power does not cause interference and has an effect of improving radio quality in a grouping cell area.

In addition, as shown in FIG. 20, when 57 spot component carrier coverages for a specific subband (eg, FA7) are grouped into 19 spot component carrier coverages, and three cells are configured within the entire area coverage. Even as described in FIG. 18, each TP within each cell can operate transmit power differently.

21 is a diagram illustrating an example of an antenna according to an embodiment of the present invention.

Referring to FIG. 21, one antenna (TP) can support multiple layers. A layer may mean an independent stream having other information transmitted simultaneously. For example, one antenna (TP) can support three layers.

As such, when an antenna supporting three layers is used, one subband may be divided into three layers. Therefore, in the case of an antenna supporting one layer as shown in FIG. 2, although it can provide 57 spot component carrier coverage provided in a specific subband (eg, FA7), an antenna supporting three layers is used. In this case, 171 spot component carrier coverage can be provided. At this time, as described in FIG. 3, when the entire system bandwidth is divided into 8 subbands ((FA1, FA2, FA3, FA4, FA5, FA6, FA7, FA8) and operated, a total of 1368 spot elements are provided within one entire area coverage. Carrier coverage can be provided.

The logically expanded spot component carrier coverages can be configured for each specific layer of a specific subband, as shown in FIG.

22 is a diagram illustrating an apparatus for configuring a distributed multi-point cooperative dynamic cell according to an embodiment of the present invention.

Referring to FIG. 22 , the distributed multi-point cooperative dynamic cell configuration apparatus 100 includes a processor 110, a transceiver 120, and a memory 130. The distributed multi-point coordinated dynamic cell configuration apparatus 100 may be implemented in a centralized server that centrally manages DUs or may be implemented in DUs.

The processor 110 may configure a dynamic cell and operate the cell as described based on FIGS. 1 to 21 . The processor may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which a method according to embodiments of the present invention is performed.

The transceiver 120 is connected to the processor 110 to transmit and receive radio signals. One

The memory 130 stores instructions for execution by the processor 110 or loads and temporarily stores instructions from a storage device (not shown), and the processor 110 stores instructions in the memory 130 or Execute the loaded command.

The processor 110 and the memory 130 are connected to each other through a bus (not shown), and an input/output interface (not shown) may also be connected to the bus. At this time, the transceiver 120 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.

Embodiments of the present invention are not implemented only through the devices and / or methods described above, and may be implemented through a program that realizes functions corresponding to the configuration of the embodiments of the present invention or a recording medium in which the program is recorded, Such an implementation can be easily implemented by an expert in the technical field to which the present invention belongs based on the description of the above-described embodiment.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. that fall within the scope of the right.

Claims (10)

A distributed multi-point cooperative dynamic cell configuration method in a device that manages a plurality of transmission points (TPs),
Forming one virtual spot coverage with sector coverage formed by two or more TPs in different locations;
configuring at least one cell by logically grouping a plurality of virtual spot coverages formed within the entire area coverage;
Dividing and operating the entire system band into a plurality of sub-bands;
Selecting a cell of at least one subband among the plurality of subbands as a cell of a coverage layer to which a UE always accesses; and
selecting at least one cell of at least one other subband among the plurality of subbands as a cell of a capacity layer to be additionally accessed by the terminal;
Including,
The coverage formed by one TP is divided into a plurality of sector coverages, and the entire area coverage is formed by coverage by the plurality of TPs. In paragraph 1,
The configuring step includes grouping the plurality of virtual spot coverages into the at least one cell by individually using one virtual spot coverage as a minimum unit in each of the plurality of subbands Distributed multi-point cooperative dynamic cell How to configure. delete In paragraph 2,
The step of selecting a cell of the capacity layer comprises dynamically changing a cell of the capacity layer based on at least one of interference, mobility, and capacity. In paragraph 2,
The step of selecting a cell of the coverage layer includes always activating a cell of the coverage layer,
The step of selecting a cell of the capacity layer comprises dynamically activating the cell of the capacity layer based on at least one of interference, mobility, and capacity. In paragraph 2,
The grouping includes configuring the cells differently from each other in at least some subbands among the plurality of subbands. In paragraph 1,
Wherein the configuring of the at least one cell comprises activating some of the at least one cell and inactivating the remaining part. In paragraph 1,
Wherein the configuring of the at least one cell comprises differently operating transmission power of TPs in each cell. In paragraph 1,
The plurality of TPs support a plurality of layers transmitting different information. Distributed multi-point cooperative dynamic cell configuration method. In paragraph 1,
The plurality of TPs have a directional antenna pattern. Distributed multi-point coordinated dynamic cell configuration method.

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