KR20030014801A - Method for allocating beam patterns of transmission antenna based on environment of downlink common physical channel in mobile communication system - Google Patents

Abstract

PURPOSE: A method for assigning a transmission antenna beam pattern according to the state of a downlink common physical channel in a mobile communication system is provided to efficiently assign an antenna beam pattern according to the characteristic of the downlink common physical channel. CONSTITUTION: A base station judges the characteristic of a downlink common physical channel signal when transmitting the downlink common physical channel signal to an MS(Mobile Station) which exists in a sectored cell area. If a downlink common physical channel has a characteristic for transmitting information applied to all MSs which exist in the cell area, the base station applies the downlink common physical channel signal to an omni-directional antenna beam pattern and transmits the downlink common physical channel signal.

Description

METHODS FOR ALLOCATING BEAM PATTERNS OF TRANSMISSION ANTENNA BASED ON ENVIRONMENT OF DOWNLINK COMMON PHYSICAL CHANNEL IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system, and more particularly, to a method for allocating an antenna beam pattern according to a downlink public physical channel state.

FIG. 1A illustrates a channel structure and a transmission antenna beam pattern of each channel of a TDD mobile communication system including an omni-cell or cell equipped with omni-directional transmission antenna according to the prior art.

As shown in FIG. 1A, one frame transmitted through the channel is 10ms, and in FIG. 1A, a frame number (FN: hereinafter referred to as "FN") = n Frame is divided into two sub-frames 110 and 112, in which a sub-frame number (SFN: hereinafter referred to as "SFN") = 2n and SFN = 2n + 1 is transmitted. do. Each of the subframes 110 and 112 has a length of 5 ms and consists of a total of seven time slots 122, 124, 126, 128, 132, 134, and 136 for data transmission, and a downlink pilot channel. Downlink pilot time slot (DwPTS) for transmitting (DwPCH: Downlink Pilot CHannel) 120 and uplink pilot time slot (UpPTS) for transmitting Uplink Pilot Channel (UpPCH: Uplink Pilot CHannel) : Uplink Pilot Time Slot (130).

In FIG. 1A, four time slots 122, 124, 126, and 128 are allocated to the downlink and three time slots 132, 134, and 136 are allocated to the uplink for data transmission. . Since the mobile communication system uses a TDD transmission scheme, downlink and uplink are switched based on two switching points 100 and 101. It can be seen that the transmission antenna beam patterns 121, 123, 125, 127, and 129 of the base station (BS) for the downlink common physical channel are identical in each time slot. In most cases, the transmit antenna beam pattern of a mobile station for uplink shared and dedicated physical channels is omni-directional as shown by reference numerals 131, 133, 135, and 137 shown in FIG. However, it may be a directional antenna beam pattern.

FIG. 1B is a diagram illustrating a channel structure and a transmission antenna beam pattern for each channel of a TDD mobile communication system composed of region division cells according to the prior art. In general, the mobile communication system is constructed and used as an area-dividing cell as described in FIG. Then, when the number of users increases, the mobile station switches to the area partitioning cell to increase the system capacity, that is, the number of subscribed users, by using the limited radio resources of the mobile communication system. In this case, when all the downlink shared physical channels are switched from the region non-divided cell to the region partitioned cell, all the downlink shared physical channels are referred to by reference numerals 161, 163, 165, 167, As in 169, it is transmitted in a directional antenna beam pattern that governs the sectors within the cell.

In general, since the mobile communication system distinguishes a base station, a cell, and a sector by using different scrambling codes, a plurality of code groups are used for a plurality of sets of scrambling codes that can be used to shorten an initial search time. Manage by dividing into (CG: Code Group). The mobile station performs communication by identifying a code group including a scrambling code that is primarily searched from the downlink signal received during the initial search and comparing the scrambling code and the received signal in the code group through a correlator. It will identify possible scrambling codes. Here, the DwPCH is used to identify the corresponding scrambling code in the code group, and the P-CCPCH is used for final scrambling code identification.

However, an incoming call with a primary common control physical channel (P-CCPCH) (hereinafter, referred to as a "P-CCPCH") that broadcasts various information such as base station-related information and each sector-related information. In the case of S-CCPCH (Secondary Common Control Physical Channel, S-CCPCH), which is in charge of a call for the S-CCPCH, a transmission antenna beam pattern defined by a corresponding sector, that is, a directional antenna beam It is appropriate to have a pattern. However, even though DwPCH 160, which can be used for initial cell search, mobile station location measurement and inter-base station synchronization, etc., searching for a scrambling code that can be serviced by a mobile station, does not transmit sector-based information, Although the information limited to the sector is not transmitted, there is a problem that the transmission antenna beam pattern is transmitted using the directional antenna beam pattern 161 defined in the sector.

3A is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with a region division cell according to the prior art.

FIG. 3B is a diagram illustrating a correlation between a scrambling code and a mobile communication system configured with an area undivided cell according to the prior art.

3A and 3B, as shown in FIGS. 3A and 3B, random scrambling codes may be selected as shown in FIGS. 3A and 3B, unless the same scrambling code is allocated to an adjacent cell in the case of an area undivided cell. Can be assigned to cells. In FIG. 3A, a plurality of code groups CG0 to G66 311 to 323 exist in the entire set of scrambling codes, that is, the entire scrambling code group 310. Each of the fields 311 to 323 has a plurality of different scrambling codes belonging to each of the code groups. For example, eight different scrambling codes exist in the code group CG0 311.

3B illustrates a correlation between the area undivided cells and the scrambling code of the mobile communication system. In the scrambling code full group 310 and the scrambling code full group 310, a plurality of code groups ( 311, 313, and 315 are present. In addition, a plurality of different scrambling codes are present in each of the plurality of code groups 311, 313, and 315. For example, scrambling codes SC ₀ , ₀ , SC _{0, 1} , SC _0,2 , .. are present. Here, shown in FIG. 3b 0 represents the j th scrambling code belonging to the i th code group.

Each of the allocated scrambling codes is allocated to area non-divided cells Cell 0 353, Cell 1 355, and Cell 2 357 of the mobile communication system. In FIG. 3B, the region non-divided cells 353, 355, and 357 are shown by dotted lines, and the solid line portions in the region non-divided cells 353, 355, and 357 are divided by the region. Sectors of cells 353, 355, and 357 to be represented are shown. Here, since the region non-divided cells 353, 355, and 357 are non-divided regions, each cell has only one sector, that is, α sector.

3A and 3B have described scrambling code allocation and correlation thereof in a mobile communication system composed of area undivided cells. Hereinafter, scrambling code allocation and correlation thereof in a mobile communication system composed of area division cells will be described with reference to FIGS. 3C to 3F. This will be described with reference.

FIG. 3C is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with a region triangulation cell according to the prior art. FIG.

FIG. 3D is a diagram illustrating a correlation between a scrambling code and a mobile communication system composed of a region three division cell according to the prior art.

Referring to FIGS. 3C and 3D, even in a mobile communication system composed of region division cells as described with reference to FIGS. 3A and 3B, any scrambling code may be provided unless an identical scrambling code is assigned to adjacent cells and sectors. Can be assigned to a cell. As shown in FIG. 3C, a plurality of code groups CG0 to G66 311 to 323 exist in the entire set of scrambling codes, that is, the entire group of scrambling codes 310. Each of the plurality of code groups 311 ˜ 323 has a plurality of different scrambling codes belonging to each of the code groups. For example, eight different scrambling codes exist in the code group CG0 311.

In FIG. 3D, a correlation between the region three division cells and the scrambling code of the mobile communication system is shown. In the scrambling code full group 310 and the scrambling code full group 310, a plurality of code groups ( 311, 313, and 315 are present. In addition, a plurality of different scrambling codes exist in each of the plurality of code groups 311, 313, and 315. For example, the code group CG0 311 includes a scrambling code SC ₀ , ₀ , SC _{0, 1} , SC _0,2 , .. are present. Here, shown in FIG. 3b 0 represents the j th scrambling code belonging to the i th code group.

Each of these allocated scrambling codes is allocated to the area triad cells (Cell 0 359, Cell 1 361, Cell 2 363, ...) of the mobile communication system. In FIG. 3D, the region tri-division cells 359, 361, and 363 are shown by dotted lines, and the solid portions in the region tri-division cells 359, 361, and 363 are the region 3. The sectors of each of the divided cells 359, 361, and 363 are shown. In this case, since the region 3 division cells 359, 361, and 363 have a region divided into three regions, each cell has three sectors, that is, α, β, and γ sector structures.

FIG. 3E is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with a 6-division cell.

FIG. 3F illustrates an example of scrambling code allocation in a mobile communication system in which various types of cells are mixed according to the related art.

Referring to FIG. 3E, as described with reference to FIGS. 3A and 3C, the entire set of scrambling codes, that is, the entire scrambling code group 310, includes a plurality of code groups CG0 to G66 ( 311 to 323, and a plurality of different scrambling codes belonging to each of the code groups exist in each of the plurality of code groups 311 to 323. The different scrambling codes are allocated to the region six division cells, that is, region six division cells having a six sector structure of α, β, γ, δ, ε, ζ.

Referring to FIG. 3F, as described above with reference to FIGS. 3A, 3C, and 3E, the entire set of scrambling codes, that is, the entire scrambling code group 310, includes a plurality of code groups CG0 to CG0 to CG0 to CG0 to CG0 to CG0-C. G66) 311 ˜ 323 exist, and a plurality of different scrambling codes belonging to each of the code groups exist in each of the plurality of code groups 311 ˜ 323. The different scrambling codes include various types of cells, that is, an area non-divided cell (single sector structure), an area tri-divided cell (α, β, γ sector structure), an area 6 divided cell (α, β, γ, δ, ε and ζ sector structures) are allocated in a mixed state.

FIG. 5A is a diagram schematically illustrating a state in which transmission of a specific downlink shared physical channel of cell "0" is stopped for mobile station position measurement in a mobile communication system configured with an area undivided cell according to the prior art, and in particular, a system clock Base station 500 located at (X ₀ , Y ₀ , Z ₀ ) having (System Clock) T ₀ has stopped transmitting DwPCH to cell 502 of “0” and have. When the mobile station 570 is located close to the cell area 502 of the base station 500 capable of communication service, the DwPCH signal received from the base station 500 is different from the neighboring base stations 520, 530, and 540. It is relatively strong compared to the received DwPCH signal. Therefore, the mobile station 570 is adjacent to the neighbor base stations 520 because the signal to interference ratio (SIR) of the DwPCH signal received from the neighbor base stations 520, 530, and 540 is bad. The DwPCH signals received from 530 and 540 cannot be detected properly. Thus, the mobile station 570 temporarily stops transmitting the DwPCH signal received from the " 0 " base station 500, which is received with the strongest strength, and thus the neighboring base stations 520, 530, ( Lowering the interference on the DwPCH signal received from 540 improves the signal-to-interference ratio of the DwPCH signal received from the adjacent base stations 520, 530, and 540. As described above, a method of temporarily stopping downlink channel signal transmission for mobile station position measurement is called idle period downlink (IPDL). A value measured when the base station 500 transmits the DwPCH signal (for example, arrival time t ₀ ) and an adjacent base station when the base station 500 does not transmit the DwPCH signal. The position of the mobile station 570 is calculated using the measured values (eg, arrival times t ₂ , t ₃ , t ₄ ) from the DwPCH signals from the fields 520, 530, and 540. The above measurement values may use values such as Time of Arrival (TOA), Time Difference of Arrival (TDOA), Angle of Arrival (AOA), and the like. The location of the mobile station 570 may be calculated by the mobile station 570 itself using the measured value and related information from the base stations, and the calculated location of the mobile station 570 may be determined by a request of a communication network. It is transmitted to the base station 500. This mobile station position measurement method is referred to as a " Handset-based Positioning " method. Alternatively, the mobile station 570 transmits the measured value to the base station 500, and the base station 500 that receives the measured value calculates the location of the mobile station 570 and sends it to a server in a communication network. It may be stored or transmitted to the mobile station 570. This mobile station position measurement method is referred to as " Handset-assisted Positioning " method. In addition to the mobile station based positioning method and the mobile station assisted position measuring method, there are various other methods including network-based positioning in the mobile station location measuring method. The triangulation method is used, but since the correlation does not exist with the present invention, a detailed description thereof will be omitted.

FIG. 5B schematically illustrates a state in which a transmission of a specific downlink shared physical channel of a sector "α" of a cell "0" is stopped for mobile station position measurement in a mobile communication system configured with a region triangulation cell according to the prior art; FIG. to be.

FIG. 5C is a diagram schematically illustrating a state in which transmission of a specific downlink public physical channel of a "β" sector of a cell "0" is stopped for mobile station position measurement in a mobile communication system composed of a region three division cell according to the prior art; FIG. to be.

FIG. 5D is a diagram schematically illustrating a state in which transmission of a specific downlink shared physical channel of a "γ" sector of a cell "0" is stopped for a mobile station position measurement in a mobile communication system composed of a region three division cell according to the prior art; FIG. to be. 5B, 5C, and 5D show that the base station 500, which is located at (X ₀ , Y ₀ , Z ₀ ) having the system clock T ₀ in the region division cell, is “0”. The state where the transmission of the DwPCH signal transmitted from each sector ("α", "β", "γ") of the "cell 502" is sequentially stopped.

Referring to FIG. 5B, if the mobile station 570 exists at the boundary between two adjacent sectors, that is, the sector 502 and the sector 504, the transmission of the DwPCH signal of one sector, that is, the sector 502, is lost. Even if it is stopped, if the transmission of the DwPCH signal from another sector, that is, the sector 504, is not stopped, the interference between the mutual signals is not sufficiently reduced, thereby reducing the efficiency of the idle period downlink (IPDL). have. 5C is similar to the case described with the α sector of FIG. 5B, and there is a problem that the efficiency of the downlink downlink is deteriorated as well as being performed in the β sector. FIG. 5D has no effect on the position measurement of the mobile station 570 because the sectors in which the DwPCH signal is not reached to the mobile station 570 perform downlink downlink.

FIG. 7A is a diagram schematically illustrating a state in which a transmission antenna beam pattern of a downlink pilot channel and a primary common control channel are used together in a mobile communication system composed of a region non-dividing cell according to the related art.

FIG. 7B is a view schematically illustrating a state in which a transmission antenna beam pattern of a downlink pilot channel and a primary common control channel are used together in a mobile communication system composed of a region triangulation cell according to the prior art.

7A and 7B, first, a mobile station transmits a signal through an omnidirectional antenna, wherein FIG. 7A is a mobile communication system composed of region non-divided cells, and FIG. 7B is composed of region three divided cells. As a mobile communication system, even if the mobile station uses the same omnidirectional antenna, the characteristics such as the signal-to-interference ratio are different when the mobile station is at the boundary of an adjacent sector. As a result, when the mobile station transmits a signal to the base station through a random access channel, the mobile station estimates a path loss by receiving a common physical channel signal whose initial transmission power value is transmitted from the base station at a fixed transmission power. Thus, there may be a difference in an offset value at "(initial transmit power value) + (offset)" determined in the case of FIGS. 7A and 7B, and the difference in offset value is determined by the reception diversity (Rx Diversity) at the base station. It depends on how you apply the receive antenna beam pattern to get. Thus, in the case of the region division cell in which one cell is divided into a plurality of sectors, the transmission antenna beam patterns of all the downlink physical channels are the same without considering the characteristics and functions of the downlink common physical channel transmitted from the base station to the mobile station. There is a problem in that it is impossible to transmit and receive signals differently according to the characteristics and functions of the downlink common physical channel.

Accordingly, an object of the present invention is to provide a method for efficiently allocating an antenna beam pattern according to a characteristic of a downlink shared physical channel in a mobile communication system.

It is another object of the present invention to provide a method of increasing the efficiency of mobile station position measurement over a downlink shared physical channel by matching the idle periods of all sectors in the same cell in operating the idle period downlink in a mobile communication system.

Another object of the present invention is to provide a scrambling code allocation method for reducing mutual interference for each of adjacent cells and sectors in a mobile communication system.

The method of the present invention for achieving the above objects; A method for allocating a transmission antenna beam pattern according to a downlink common physical channel characteristic of a mobile communication system having a base station that performs a communication service for an area division cell composed of a plurality of sectors, the base station in the area division cell region Determining characteristics of the downlink shared physical channel signal when transmitting a downlink shared physical channel signal to an existing mobile station; and as a result of the determination, the downlink shared physical channel is located in the cell region instead of the sector-based information. In the case of having the characteristic of transmitting information commonly applied to all existing terminals, the method includes transmitting the downlink common physical channel signal by applying an omnidirectional antenna beam pattern.

1A is a diagram illustrating a channel structure and a transmission antenna beam pattern for each channel of a TDD mobile communication system configured with an area-divided cell according to the prior art.

1B is a diagram illustrating a channel structure and a transmission antenna beam pattern for each channel of a TDD mobile communication system composed of region division cells according to the prior art.

2 is a diagram illustrating a channel structure and a transmission antenna beam pattern for each channel of a TDD mobile communication system including region division cells according to another embodiment of the present invention.

FIG. 3A illustrates an example of scrambling code allocation in a mobile communication system configured with a region division cell according to the prior art. FIG.

FIG. 3B is a diagram illustrating a correlation between a scrambling code and a mobile communication system configured with an area undivided cell according to the prior art. FIG.

FIG. 3C is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with a region three division cell according to the prior art. FIG.

FIG. 3D is a diagram illustrating a correlation between a scrambling code and a mobile communication system including an area triangulation cell according to the prior art. FIG.

FIG. 3E illustrates an example of scrambling code allocation in a mobile communication system configured with an area 6 division cell according to the prior art. FIG.

3F illustrates an example of scrambling code allocation in a mobile communication system in which various types of cells are mixed according to the prior art;

4A is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with an area undivided cell according to another embodiment of the present invention.

4B is a diagram illustrating a correlation between a scrambling code and a mobile communication system configured with an area undivided cell according to another embodiment of the present invention.

4C is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with a region three division cell according to another embodiment of the present invention.

FIG. 4D is a diagram illustrating a correlation between a scrambling code and a mobile communication system composed of a region three division cell according to another embodiment of the present invention.

FIG. 4E illustrates an example of scrambling code allocation in a mobile communication system configured with an area 6 division cell according to another embodiment of the present invention.

4F illustrates an example of scrambling code allocation in a mobile system in which various region partition cells are mixed according to another embodiment of the present invention.

FIG. 5A is a diagram schematically illustrating a state in which transmission of a specific downlink shared physical channel of cell "0" is stopped for mobile station position measurement in a mobile communication system configured with an area undivided cell according to the prior art; FIG.

FIG. 5B schematically illustrates a state in which a transmission of a specific downlink shared physical channel of a sector "α" of a cell "0" is stopped for mobile station position measurement in a mobile communication system configured with a region triangulation cell according to the prior art; FIG.

FIG. 5C is a diagram schematically illustrating a state in which transmission of a specific downlink public physical channel of a "β" sector of a cell "0" is stopped for mobile station position measurement in a mobile communication system composed of a region three division cell according to the prior art; FIG.

FIG. 5D is a diagram schematically illustrating a state in which transmission of a specific downlink shared physical channel of a "γ" sector of a cell "0" is stopped for a mobile station position measurement in a mobile communication system composed of a region three division cell according to the prior art; FIG.

FIG. 6 is a diagram illustrating specific downlink shared physics of sectors "α", "β", and "γ" of cell "0" in a mobile communication system including an area tri-division cell according to another embodiment of the present invention. A diagram schematically showing a state in which transmission of a channel is stopped at the same time

FIG. 7A is a diagram schematically illustrating a state in which a transmission antenna beam pattern of a downlink pilot channel and a primary common control channel are used together in a mobile communication system configured with an area undivided cell according to the prior art; FIG.

FIG. 7B is a diagram schematically illustrating a state in which a downlink pilot channel and a transmission antenna beam pattern of a primary common control channel are used together in a mobile communication system composed of a region three division cell according to the prior art

FIG. 8A is a diagram schematically illustrating a state of independently using transmission antenna beam patterns of a downlink pilot channel and a primary common control channel in a mobile communication system configured with an area undivided cell according to another embodiment of the present invention; FIG.

FIG. 8B is a diagram illustrating a state of independently using a transmission antenna beam pattern of a downlink pilot channel and a primary common control channel in a mobile communication system composed of a region three division cell according to another embodiment of the present invention.

9A schematically illustrates a transmit antenna structure for generating a transmit antenna beam pattern according to another embodiment of the present invention.

FIG. 9B schematically illustrates a circular array antenna for generating a transmission antenna beam pattern for forming an area division cell and an area non-division cell according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

A detailed description of an embodiment of the present invention uses a 3rd Generation Partnership Project (3GP) low speed or narrowband time division full duplex (NB-TDD) mobile communication system as an example. Independent transmission antenna beam pattern allocation schemes according to the characteristics and functions of downlink common physical channels according to an embodiment of the present invention are independent of downlink regardless of duplex, multiplexing, and multiple access schemes. It should be noted that the characteristics and functions of the common physical channels can be applied to any differentiated mobile communication system. In addition, the embodiment of the present invention is not intended for a dedicated physical channel that may use a dynamic transmission antenna beam forming technique such as a smart antenna, but a fixed transmit antenna beam pattern. The description will focus on a method of operating a transmit antenna beam pattern of a common physical channel having a common physical channel, which is also applicable to the dynamically formed transmit antenna beam.

FIG. 2 is a diagram illustrating a channel structure and a transmission antenna beam pattern of each channel of a TDD mobile communication system including a segmented cell or a cell equipped with directional transmission antenna according to another embodiment of the present invention. 2, the channel structure of the TDD mobile communication system including an omni-cell or cell equipped with omni-directional transmission antenna and a transmission antenna beam pattern for each channel are described above. As described in FIG. 1A of the technique, the transmission antenna beam pattern of the mobile station for uplink shared and dedicated physical channels is omni-directional, although in most cases it is omni-directional because it is an area undivided cell type, i.e., a single sector structure. Note that the (directional) antenna beam pattern may be used.

Referring to FIG. 2, one frame transmitted through a channel is 10ms, and in FIG. 2, one frame having a frame number (FN: hereinafter referred to as "FN") = n A sub-frame number (SFN: hereinafter referred to as "SFN") is divided into two sub-frames (110, 112) where 2n and SFN = 2n + 1 and transmitted. Each of the subframes 110 and 112 has a length of 5 ms and consists of a total of seven time slots 122, 124, 126, 128, 132, 134, and 136 for data transmission, and a downlink pilot channel. (DwPCH: Downlink Pilot CHannel, hereinafter referred to as "DwPCH") A downlink pilot time slot (DwPTS: Downlink Pilot Time Slot, hereinafter referred to as "DwPTS") 220 and uplink pilot A structure including an Uplink Pilot Time Slot (UpPTS: UpPTS) 130 for transmitting a channel (UpPCH: Uplink Pilot CHannel, hereinafter referred to as "UpPCH") 130 Has

FIG. 2 illustrates an example in which four time slots 122, 124, 126, and 128 are allocated to the downlink and three time slots 132, 134, and 136 are allocated to the uplink for data transmission. . Since the mobile communication system uses a TDD transmission scheme, downlink and uplink are switched based on two switching points 100 and 101. In general, the mobile communication system is constructed and used as an area-dividing cell as described in FIG. Then, when the number of users increases, the mobile station switches to the area partitioning cell to increase the system capacity, that is, the number of subscribed users, by using the limited radio resources of the mobile communication system. Thus, when switching from a region non-division cell to a region division cell, all downlink shared physical channels are conventionally transmitted in a directional antenna beam pattern that manages sectors within a cell regardless of the characteristics and functions of the downlink shared physical channels. It was. However, regardless of the characteristics and functions of the downlink common physical channel in the region division cell, transmitting a signal using the directional antenna beam pattern has a problem of degrading the efficiency of the channel signal transmission. That is, a call is received from a primary common control physical channel (P-CCPCH), which is called a P-CCPCH, which broadcasts various kinds of information such as base station-related information and sector-related information. In the case of S-CCPCH (Secondary Common Control Physical Channel, S-CCPCH), which is responsible for calling for a call, etc., the transmission antenna beam pattern defined by the sector, that is, the directional antenna It is suitable to have a beam pattern. However, DwPCH, which can be used for initial cell search, mobile station positioning, and inter-base station synchronization for searching for a scrambling code that can be serviced by a mobile station, is not limited to that sector, even though it does not transmit sector-based information. There is a problem that a transmission antenna beam pattern is transmitted using a directional antenna beam pattern defined within a sector even though the information is not transmitted.

Therefore, in the embodiment of the present invention, the DwPCH 220, which can be used for initial synchronization acquisition, scrambling code search of the corresponding cell, base station synchronization, and mobile station position measurement, has a P-CCPCH (base station related information) having a transmission antenna beam defined by a sector. Instead of broadcasting each sector-related information) and S-CCPCH (call for incoming calls, etc.), a transmission antenna having an omni-directional antenna beam pattern 221 is transmitted. Because DwPCH, which can be used for initial cell searching, mobile station positioning, and inter-base station synchronization, for synchronization acquisition and downlink scrambling codes used by the mobile station to be serviced, is transmitted within the sector even though it does not transmit sector-based information. This is because transmission by using a directional antenna beam having a limited antenna beam pattern makes mobile station location measurement and base station synchronization difficult.

4A is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with an area undivided cell according to another embodiment of the present invention.

FIG. 4B is a diagram illustrating a correlation between a scrambling code and a mobile communication system configured with an area undivided cell according to another embodiment of the present invention.

4A and 4B, any scrambling code may be allocated to each cell unless the same scrambling code is allocated to an adjacent cell in the case of an area undivided cell. In FIG. 4A, a plurality of code groups (CG: CG0 to G66) 311 to 323 exist in the entire set of scrambling codes, that is, the entire scrambling code group 310. Each of the fields 311 to 323 has a plurality of different scrambling codes belonging to each of the code groups. For example, eight different scrambling codes exist in the code group CG0 311.

4B illustrates a correlation between the area undivided cells and the scrambling code of the mobile communication system. In the scrambling code full group 310 and the scrambling code full group 310, a plurality of code groups ( 311, 313, and 315 are present. In addition, a plurality of different scrambling codes are present in each of the plurality of code groups 311, 313, and 315. For example, scrambling codes SC ₀ , ₀ , SC _{0, 1} , SC _0,2 , .. are present. Here, shown in Figure 4b 0 represents the j th scrambling code belonging to the i th code group. Each of the allocated scrambling codes is allocated to area non-divided cells Cell 0 353, Cell 1 355, and Cell 2 357 of the mobile communication system. In FIG. 4B, the region non-divided cells 353, 355, and 357 are shown by dotted lines, and the solid line portions in the region non-divided cells 353, 355, and 357 are divided by the region. Sectors of cells 353, 355, and 357 to be represented are shown. Here, since the region non-divided cells 353, 355, and 357 are non-divided regions, each cell has only one sector, that is, α sector. However, considering the case where the traffic in the region non-divided cell is increased and the region non-divided cell is switched to the region divided cell, as shown in FIGS. 4a and 4b, the adjacent cells in the same code group are indicated by dotted lines. Allocates the scrambling code so as not to allocate the scrambling code.

FIG. 4C is a diagram illustrating an example of scrambling code allocation in a mobile communication system configured with a region three division cell according to another embodiment of the present invention.

FIG. 4D is a diagram illustrating a correlation between a scrambling code and a mobile communication system composed of a region three division cell according to another embodiment of the present invention.

4C and 4D have the same scrambling code-related structure as described with reference to FIGS. 4A and 4B, but the cell form is a cell having an area three division cell, that is, an α sector, a β sector, and a γ sector structure. As described above with reference to FIGS. 4A and 4B, in the case of the cell division, the scrambling codes in the same code group indicated by dotted lines are not allocated to adjacent cells, and the same scrambling codes are not allocated among adjacent sectors in the cell. do. For example, since scrambling codes belonging to the same code group should not be allocated to the Cell 0 353, the Cell 1 355, and the Cell 2 357 in FIG. 4D, the Cell 0 353, Cell 1 355, and Cell 2 357 are not allocated. The code group of the scrambling code assigned to each is different from CG0 311, CG1 313, and CG2 315. Since the scrambling codes in the same code group may be allocated to the sectors of the Cell 0 353, that is, the sectors α, β, and γ, it is impossible to assign the same scrambling codes themselves. SC _0,0 of 311 is assigned, SC _0,1 of CG1 313 is assigned to β sector, and SC _0,2 of CG0 311 is assigned to gamma sector.

FIG. 4E is a diagram illustrating an example of assigning a scrambling code to a mobile communication system configured with an area 6 division cell according to another embodiment of the present invention.

4F is a diagram illustrating an example of scrambling code allocation in a mobile system in which various region partition cells are mixed according to another embodiment of the present invention.

Referring to FIGS. 4E and 4F, similarly to FIGS. 4A, 4B, 4C, and 4D, scrambling codes in the same code group indicated by dotted lines are not allocated to adjacent cells, and the same code group is used between adjacent sectors in the cell. This may be assigned, but the scrambling code is assigned to a cell or sector so that the same scrambling code in the same code group is not assigned.

FIG. 6 is a diagram illustrating specific downlink shared physics of sectors "α", "β", and "γ" of cell "0" in a mobile communication system including an area tri-division cell according to another embodiment of the present invention. A diagram schematically showing a state in which transmission of a channel is stopped at the same time. Prior to the description of FIG. 6, in the case of the region non-dividing cell for mobile station position measurement, the system clock T0 having the system clock T ₀ is described in the embodiment of the present invention as described with reference to FIG _. , Base station 500 located at Y ₀ , Z ₀ ) is the same as the state in which DwPCH of cell 502 has stopped transmitting for idle period downlink (IPDL). Care must be taken.

Referring now to Figure 6, a mobile station 570 exists at the boundary between two adjacent sectors, i.e., sectors 502 and βsector 504. In the case of an area triad cell for mobile station 570 measurement, Base station 500 located at (X ₀ , Y ₀ , Z ₀ ) having a system clock T ₀ causes all sectors (cells 502, β) of cell 502 to be “0”. The transmission of the DwPCH transmitted from the sector 504 and the gamma sector 506 is simultaneously stopped. Thus, even when the mobile station 570 is at the boundary between two adjacent sectors, transmission of DwPCH of all sectors (α sector 502, β sector 504, and gamma sector 506) in a cell is stopped because it is stopped. The interference from adjacent sectors does not occur, which has the advantage of maximizing the efficiency of idle period downlink (IPDL).

FIG. 8A is a diagram schematically illustrating a state in which a transmission antenna beam pattern of a downlink pilot channel and a primary common control channel are independently used in a mobile communication system including an area undivided cell according to another embodiment of the present invention.

FIG. 8B is a diagram illustrating a state in which a transmission antenna beam pattern of a downlink pilot channel and a primary common control channel are independently used in a mobile communication system composed of a region three division cell according to another embodiment of the present invention.

Referring to FIG. 8A, in a mobile communication system composed of region undivided cells, a primary common control physical channel (P−) that transmits downlink pilot channel (DwPCH) and information commonly required by all mobile stations in a cell or sector. CCPCH) transmit antenna beam pattern is used independently. Although the transmission antenna beam patterns of DwPCH and P-CCPCH are independently used, since the two transmission antenna beam patterns are omni-directional, they are the same as those described with reference to FIG.

Referring to FIG. 8B, when the mobile station is at the boundary of an adjacent sector, the DwPCH signal is transmitted in the omni-directional transmit antenna beam pattern, and the P-CCPCH signal is transmitted in the directional transmit antenna beam pattern, so that the mobile station transmits a random access channel. When transmitting a signal to the base station, it is possible to more effectively estimate the initial transmit power value of the mobile station. Thus, by reducing the value of the offset at the determined "(initial transmit power value) + (offset)", it is possible to mitigate unnecessary interference increase of the uplink. That is, the power loss on the channel signal transmission can be reduced, so that the transmission power value estimation is efficient.

9A is a diagram schematically illustrating a transmit antenna structure for generating a transmit antenna beam pattern according to another embodiment of the present invention.

Referring to FIG. 9A, an antenna selector 910 is first used to generate a corresponding transmit antenna beam pattern according to a desired situation, that is, a channel type or a cell shape as described above. Outputs an antenna selection control signal. Thus, the omnidirectional transmission antenna 920 or the directional transmission antenna 930 is selected according to the control signal output from the antenna selector 910 to generate the transmission antenna beam pattern. Here, the non-directional transmit antenna 920 is composed of only a dipole antenna, the directional transmit antenna 930 is composed of a dipole antenna, a reflector and a parasitic element. .

Reference numerals 922 and 932 shown in FIG. 9A denote side views of the omnidirectional transmission antenna 920 and the directional transmission antenna 930 beams, respectively. Also, reference numerals 924 and 934 illustrated in FIG. 9A are top views of the beams of the omnidirectional transmission antenna 920 and the directional transmission antenna 930, respectively.

FIG. 9B is a diagram schematically illustrating a circular array antenna for generating a transmission antenna beam pattern for forming an area division cell and an area non-division cell according to another embodiment of the present invention.

Referring to FIG. 9B, first, a plurality of antenna elements are arranged in a circle. A top view 950 of a circular array antenna and a side view 960 of the circular array antenna with the plurality of antenna elements arranged in a circle are shown in FIG. 9B. Then, the input weight is set to each of the plurality of antenna elements arranged in a circle to generate a transmission antenna beam pattern having a desired shape in the system. In this case, an input weight for each of the antenna elements is controlled by a weight setter 940 and for each of the plurality of antenna elements according to a control signal output from the weight setter 940. Input weights, that is, weights w ₀ , w ₁ , w ₂ , ... are controlled.

For this purpose, the spacing of each of the plurality of antenna elements is relatively narrow compared to the wavelength of the carrier wave, and the antenna elements constituting the circular antenna arrays are relatively large so that the desired beam pattern can be more efficiently formed in the system. . If the weights assigned to each of the antenna elements are the same, the circular array antenna forms an almost circular omni-directional transmission antenna beam pattern as shown by reference numeral 952 shown in FIG. 9B according to the principle of Huygens. In addition, by setting the input weight for each of the antenna elements according to the situation, it is possible to form a directional transmit antenna beam pattern as shown by reference numeral 954 shown in FIG. 9B.

9A and 9B, an example of an antenna system capable of forming an independent transmit antenna beam pattern according to the characteristics and functions of a downlink common physical channel includes a transmit antenna system having a dipole antenna as an antenna element. As an example, embodiments of the present invention as well as a transmission antenna system having the dipole antenna as an antenna element may be applied to other transmission antenna systems.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides the downlink shared physical channel according to the characteristics and functions of the downlink shared physical channel, that is, when the information transmitted through the downlink shared physical channel is information corresponding to a specific mobile station in a specific sector. If the information transmitted through the downlink common physical channel is information corresponding to all mobile stations in the same cell without sector limitation, the downlink shared physical channel is used as the omnidirectional antenna beam pattern. send. Accordingly, the antenna beam pattern pattern is differentiated according to the characteristics and functions of the downlink shared physical channel, thereby facilitating synchronization between base stations, measurement of mobile station location, and determination of initial transmission power of the mobile station during random access channel transmission.

In addition, the present invention is an area division cell in which a cell type managed by a base station in case of using an idle period downlink (IPDL) method used for mobile station location measurement is divided into several sectors. Matching the idle periods of all sectors has the advantage that signals transmitted and received in other sectors within the same cell do not act as interference signals to the mobile station position measurement. This has the advantage of maximizing idle period downlink (IPDL) efficiency for the mobile station position measurement.

Claims (10)

A method of allocating a transmission antenna beam pattern according to a downlink common physical channel characteristic of a mobile communication system having a base station that performs a communication service for an area division cell composed of a plurality of sectors, Determining characteristics of the downlink shared physical channel signal when the base station transmits a downlink shared physical channel signal to a mobile station existing in the region divided cell region; As a result of the determination, when the downlink shared physical channel has a characteristic of transmitting information commonly applied to all terminals existing in the cell area instead of the sector-based information, the downlink shared physical channel signal is non-directional. The method comprising the step of transmitting by applying an antenna beam pattern. The method of claim 1, And if the downlink shared physical channel has a characteristic of transmitting information limited to the sector-based specific mobile station, transmitting the downlink shared physical channel signal by applying a directional antenna beam pattern. Characterized in that the method. The method of claim 1, The downlink public physical channel transmitting information commonly applied to all the terminals is a downlink pilot channel. The method of claim 2, And the downlink shared physical channel transmitting information limited to the sector-based specific mobile station is a primary shared control physical channel. The method of claim 2, And the downlink shared physical channel transmitting information limited to the sector-based specific mobile station is a secondary common control physical channel. A method for allocating a scrambling code in a mobile communication system, comprising a plurality of area undivided cells, having a plurality of code groups grouping all scrambling codes usable for data communication by a predetermined number, Checking a scrambling code assigned to adjacent cells adjacent to the arbitrary cell when assigning a scrambling code to any one of the cells; Detecting the code groups to which the scrambling codes assigned to the adjacent cells as a result of the checking, and selecting one of the scrambling codes of other code groups other than the detected code groups and assigning them to the scrambling codes. How to. A method of allocating a scrambling code in a mobile communication system composed of a plurality of region division cells, comprising a plurality of code groups in which all scrambling codes usable for data communication are grouped by a predetermined number, Checking a scrambling code assigned to adjacent cells adjacent to the arbitrary cell when allocating a scrambling code to a specific sector of any of the region cells; Detecting the code groups to which the scrambling code allocated to the neighboring cells belongs as a result of the checking; Detecting scrambling codes allocated to sectors other than the specific sector among sectors constituting the arbitrary cell after detecting the code groups; A scrambling code that does not belong to code groups assigned to the adjacent cells after detecting scrambling codes assigned to sectors other than the specific sector and is not the same as the scrambling code assigned to sectors other than the specific sector Allocating a specific sector to the specific sector. The method of claim 6, The scrambling code belonging to the code groups assigned to the adjacent cells after detecting the scrambling codes assigned to sectors other than the specific sector, and not the same as the scrambling code assigned to the sectors other than the specific sector. And assigning to the specific sector. A mobile station position measurement method in a mobile communication system composed of region division cells having a plurality of sectors, Receiving a location measurement request for the mobile station; And stopping the downlink pilot channel signal transmission for a predetermined period of time at the same time point for each of the plurality of sectors constituting the area division cell in response to receiving a location measurement request for the mobile station. Way. The method of claim 8, And measuring the position of the mobile station with the position value received from the mobile station after stopping the downlink pilot channel signal transmission.