KR100292638B1 - Radio communication method and radio communication apparatus - Google Patents

Abstract

In a wireless communication method, one or more narrow-area sectors which are partially overlapped with wide-area sectors are defined, and the coverage of each narrow-area sector is arranged so as not to overlap each other, and the wide-area antenna covering the wide-area sector and the narrow-area sector A covering narrow range antenna is prepared at each base station, and the same signal is transmitted to both wireless terminals located in one of the narrow range sectors using both the wide range antenna and the one narrow range antenna. A signal from a wireless terminal is received by the wideband antenna and the one narrow range antenna, and both received signals are synthesized to extract a signal.

Description

RADIO COMMUNICATION METHOD AND RADIO COMMUNICATION APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication method and a wireless communication apparatus, and more particularly, to a wireless communication method and a wireless communication apparatus operating one cell as a plurality of sectors in a wireless communication system such as a cellular system.

Recently, a Code Division Multiple Access (CDMA) radio base station for dividing and operating a cell into a plurality of sectors has been proposed. 11 shows a configuration diagram of a conventional wireless communication system.

This base station 11 is connected to a base station control device 13 via a communication line 12. The base station control device 13 is connected to the switching center 14. In addition, the base station control device 13 is connected to one or a plurality of base stations 11 through the communication line 12, and terminates the air interface and switches the signals from the base station 11, physical channels and logical channels. It has a function of switching and the like.

In this example, one cell that operates the base station 11 is divided into three sectors 15 to 17 by the directional antenna. In such a conventional CDMA cellular system, the sectors 15 to 17 constituting the cell are transmitted with the same transmission power distribution with respect to the angle within the sector. At this time, traffic of the entire sector is considered, but traffic distribution within the sector is not considered.

In addition, a rake receiver is known as an apparatus for receiving a radio signal. For rake receivers, (1) AJ Viterbi 'CDMA Principles of Spectrum Communication' Addison-Wesley 1995, (2) KS Gilhousen 'Optimum bandwidth for CDMA' International Conference on Personal, Mobile Radio, and Spread Spectrum Communications, Beijin, China, October 12-14, 1994, and (3) RD Blakeney, et al 'Demodulation Element Assignment in a System Capable of Receiving Multiple Signals' US Pat. No. 5,490,165 February 6, 1996 and the like.

An object of the present invention is to provide a wireless communication method and apparatus with good line quality and low power consumption when there is a bias in traffic distribution in a sector.

In a wireless communication method for achieving the above object, a narrow range sector partially overlapped with a wide sector is determined, and a wide range antenna covering the wide range sector and a narrow range antenna covering the narrow range sector are prepared at the base station, respectively. For the wireless terminal located in the narrow range sector, the same signal is transmitted using both the wide antenna and the narrow antenna. A signal from a wireless terminal is received by the wideband antenna and the narrow range antenna, and both received signals are synthesized to extract a signal. In addition, only a signal of a traffic channel is transmitted using both the wideband antenna and the narrow range antenna.

According to the radio communication method and radio communication apparatus of the present invention, the following remarkable effects are obtained.

(1) In the area where the N-sector (narrow angle sector) is overlapped among the W-sectors (wide angle sector), the capacity increases as much as the power that can be transmitted. However, the maximum capacity of the overlapped area is equivalent to the maximum capacity when operated in one sector). Therefore, by setting one or a plurality of overlapping regions of N-sectors in the W-sectors, the capacity in the W-sectors can be increased spatially.

(2) Since the W-sector and the N-sector operate at the same frequency and use the same coded channel in synchronization, a handoff necessary for multi-sectorization without performing inter-sector identification regardless of the number of sectors is increased. This eliminates unnecessary overhead capacity.

(3) In the W-sector, since the power suitable for the traffic other than the region where the N-sector is overlapped is transmitted with the minimum power necessary to cover the service area, the transmission power can be reduced and the power can be reduced. .

1 is a block diagram of a wireless communication system according to the present invention.

2A and 2B are explanatory diagrams of power distribution between the W-sector and the N-sector.

3 is a configuration diagram of a wireless terminal receiving system.

4 is a configuration diagram of a base station transmission system.

5 is a configuration diagram of a base station receiving system.

6A and 6B are explanatory diagrams of the geographical distribution of system capacity.

7 is a block diagram of a control function for each line of a base station.

8 is a configuration diagram of a base station transmission system having a polarization transmission function.

9 is an explanatory diagram of a control method of a transmission power ratio of a W-sector and an N-sector.

10 is an explanatory diagram of another embodiment related to overlay.

11 is a configuration diagram of a conventional wireless communication system.

<Explanation of symbols for main parts of the drawings>

1: base station

2: communication line

3: base station controller

4: exchange office

5 to 7: wide angle sector

8, 9: narrow angle sector

Here, the TIA / EIA / IS-95A system, which is a standard of the CDMA cellular wireless communication system, will be described as an example.

1. Basic Concept

1 is a block diagram of a wireless communication system according to the present invention. This figure shows a cell configuration in a CDMA cellular system as an example.

A base station 1 such as a CDMA wireless base station is connected to a base station control device 3 via a communication line 2. The base station control device 3 is connected to the switching center 4 via an interface. In addition, the base station control device 3 is connected to one or a plurality of base stations 1 through the communication line 2, and terminates the radio interface and switches the signals from the base station 1, physical channels and logical channels. It has a function of switching and the like.

In this example, one cell that operates the base station 1 is divided into three wide-angle sectors (W-sectors) 5 to 7. The W-sectors 5 to 7 transmit signals to regions within the sectors with the same transmission power distribution. In addition, one or a plurality of narrow angle sectors (N-sectors) covering a narrow angle are superposed on one W-sector. In this figure, an example in which the N-sectors 8 and 9 overlap with the W-sector 5 is shown. This overlapping region is assumed to be a high traffic region where traffic is concentrated, for example, geographically or temporally. Areas that do not overlap are areas where traffic is lower than these high traffic areas and are covered only by the W-sector 5.

This W-sector and N-sector are realized by independent directional antennas, respectively.

The signals transmitted from the W-sector 5 and the N-sector 8 or 9 are the same and are synchronized at the chip level. The chip level synchronization refers to a state in which synchronization is performed on each chip (or bit) when the logic level signal is encoded by orthogonal encoding or the like and further diffused (scrambled).

Next, communication between the radio terminal and the base station 1 will be described. First, for the downlink (transmitted by the base station), the radio terminal located in the high traffic area receives radio waves from both the W-sector and the N-sector antennas. The wireless terminal recognizes signals from the W-sector and the N-sector as multipaths. In the wireless terminal, the rake receiver is used to rake synthesize the received signal. On the other hand, with respect to the uplink (transmitted by the wireless terminal), the base station 1 transmits a spatial diversity (or multipath) by a W-sector and an N-sector to a transmission signal from a wireless terminal located in a high traffic region. Receive as. This received signal is rake-combined in the same way as a base station having a multisector configuration.

2. Downlink transmit power

The base station transmits a signal to the wireless terminal using the antenna for the W-sector and the antenna for the N-sector. The relationship between the channel and the transmission power at that time is shown in Figs. 2A and 2B. FIG. 2A shows the transmit power of the W-sector and FIG. 2B shows the transmit power of the N-sector. The base station transmits a signal of an overhead channel including a pilot channel and a control channel using only a W-sector antenna. The signal of the traffic channel is transmitted using the antenna for the W-sector and the antenna for the N-sector. 2A and 2B, the maximum transmit power (Max Power / Channel) for each channel determined by the system is shown. The actual transmit power of each traffic channel and the transmit power ratio of the W-sector and the N-sector are obtained by the position of the wireless terminal, the power control information from the wireless terminal, and the power ratio received in each sector (to be described later). Also, the actual transmit power is determined within its maximum transmit power. The transmit power of both sectors is controlled independently for each traffic channel.

6A and 6B show explanatory diagrams of the geographical distribution of system capacity. FIG. 6A illustrates sector A in detail as an example, in which the W-sector 5 and the N-sectors 8 and 9 superimposed thereon are shown. 6B also shows the distribution of system capacity in the sector cross section in the arrow of FIG. 6A. Here, positions a, b, c, d, e and f in FIG. 6a correspond to respective points in the sector cross section in FIG. 6b.

The entire sector is covered by the W-sector 5 which includes the low traffic area. The capacity of the W-sector 5 is set lower than the CDMA system capacity limit. The area except the high traffic area (low traffic area) is covered by the capacity of the W-sector 5. On the other hand, the high traffic region overlaps the N-sectors 8 and 9 because the capacity is insufficient in the W-sector 5. Only the region in which the N-sectors 8 and 9 overlap the W-sector 5 is allowed to operate the system by traffic up to the CDMA system capacity limit, as shown. By setting such capacity distribution, it is possible to set sector capacity according to traffic distribution.

3. Overview of Call Control

Location registration of the wireless terminal is done for the W-sector. The wireless terminal recognizes that the W-sector and the N-sector are the same one sector.

Call control when calling from a wireless terminal and when calling from a base station is the same as that of a normal multisector system operation, and does not particularly require new functions.

Next, the control at the time of movement between the W-sector / N-sector of the wireless terminal will be described. When the wireless terminal is located in an area where both sectors overlap, the transmission signal of the wireless terminal is received at the antennas of both sectors. In the base station reception system, rake synthesis of received signals by both sectors is performed. The wireless terminal can communicate with the base station without being aware of both the W-sector and the N-sector. In addition, the base station also does not need a procedure such as handover at the boundary between the W-sector and the N-sector.

4. Configuration of base station and wireless terminal

4-1. Wireless terminal

The wireless terminal has a reception system and a transmission system, and FIG. 3 shows a configuration diagram of the wireless terminal reception system. This shows the configuration of a wireless terminal receiving system using a rake receiver, and the wireless communication system of the present invention uses this to communicate with a base station.

The wireless terminal includes a high frequency circuit (RF, Digital Conv.) 31, a search element 32, a reception element (finger) 33, a controller 34, a synthesizer, and a combiner. 35) and a decoder (Viterbi Dec .; 36). The high frequency circuit 31 is connected to the antenna 30 and also includes a digital converter. The decoder 36 also has a Viterbi decoder, for example. The search element 32 determines the position and phase of each pulse of the plurality of received signals by the multipath received by the high frequency circuit 31. The control unit 34 allocates each signal to each of the receiving elements 331 to 33n according to the output of the search element 32, and at the same time, inputs the phase, delay, power estimation, and input to the receiving element 33 for the received signal. The timing and the like are adjusted and controlled. The synthesizer 35 performs weighting on the phase, delay, amplitude, and the like of each signal by the multipath under the control of the control unit 34, and adds and combines the received signals (lake synthesis). Accordingly, the radio terminal can receive well even in a weak signal. The synthesized signal is decoded by the decoder 36.

The signals transmitted from the W-sector and the N-sector are synchronized with chip synchronization, and the same code is used. That is, the wireless terminal does not distinguish between the two sectors, and recognizes and receives the signals from the same sector. In addition, the W-sector can recognize and receive the W-sector as a multipath even if the signal from the N-sector has been shifted in time due to the propagation delay.

4-2. Base station transmission system

Next, FIG. 4 shows a configuration diagram of the base station transmission system.

In the transmission system of the illustrated base station 1, for example, the base station 1 is composed of sectors A, B, and C, and sector A is a wide angle sector (a sector) and two narrow angle sectors (a-1 sector). And a-2 sectors). The base station transmission system includes an antenna for each sector, an RF-UNIT (41-43), a controller (45), a vocoder, and a voice and layer 2/3 processing interface (VLP). An interface 46, a channel element 47, and a signal combiner 48. The base station control device 3 has a VLP 49 having a vocoder and processing units of layers 2 and 3, and processes the received signal from the exchange of the switching center 4. The output of the VLP 49 is input to the VLP interface 46 of the base station via the communication line 2.

The VLP interface 46 has a multiple conversion device for multiplexing the signal. In both blocks of the base station transmission system / reception system, signal processing is performed in the form of a packet signal or a signal format such as ATM. Processing for converting traffic signals, signaling (control signals) and the like in the channel element 47 into these formats is necessary, and the VLP interface 46 is a part that is responsible for this conversion function. The VLP interface 46 also has a function as a transmission device between the channel element 47 and the VLP 49. In the case of CDMA, the VLP interface 46 is often a multiple conversion device of a packet or an ATM.

The control unit 45 controls the transmission power information in the signal synthesizing unit 48 and the channel element 47, such as the high frequency units 41 to 43, and confirms whether the system is operating according to a preset system parameter and corrects the parameter. Conduct. In addition, resource management relating to allocation of the channel element 47 to the transmission line is performed. Here, the resource is, for example, allocated hardware, code, signal power, allowable interference power, and the like. The control unit 45 also monitors the protocol at the base station and notifies and manages the timing information.

The signal synthesizing unit 48 synthesizes the signals of the respective channel elements 47 and converts the transmission signals by the high frequency unit. Here, a high frequency unit (RF-UNIT) 41 is used for a sector (wide angle sector), and a high frequency unit (RF-UNIT) 42 and 43 is used for a-1 and a-2 sectors (narrow angle sector), respectively. Use another antenna to transmit the signal.

Next, the operation of the base station transmission system will be described.

First, the downlink signal transmitted from the VLP 49 is subjected to scrambling by coding and orthogonal codes or the like by the respective channel elements 47 for each line channel. Thereafter, it is passed to the signal synthesizing section 48. According to the attribute of the signal, the signal is distributed by appropriate power distribution to one sector or a plurality of sectors by the instruction from the control unit 45, and transmitted from the antenna of each sector.

4-3. Base station receiver

Next, the configuration diagram of the base station receiving system is shown in FIG.

As described above, the base station receiving system includes a base station 1 composed of sectors A, B, and C, and sector A is a wide angle sector (a sector) and two narrow angle sectors (a-1 sector and a-). 2 sectors). The base station receiving system includes a radio frequency unit (RF-UNIT) 51 to 53, a controller 55, a VLP interface 56, a channel element 57, and a signal distribution unit connected to an antenna, respectively. Signal Distributor 58). The base station control device 3 has a VLP 59 having a vocoder and processing units of layers 2 and 3, and processes the transmission signal to the exchange of the switching center 4. The output of the VLP interface 56 is input to the VLP 59 of the base station 1 via the communication line 2. The control part 55 is connected with the control part 45 of a transmission system, and performs data exchange. The controllers 45 and 55 may be realized by one controller.

The VLP 56 has multiple switching devices and, like the base station transmission system, is a part in charge of the format switching function and also has a function as a transmission device between the channel element 57 and the VLP 59.

The control unit 55 collects the received power from the high frequency units 51 to 54, the signal distribution unit 58, and the channel element 57, and confirms whether it is operating according to a preset system parameter and corrects the operation. And the like. In addition, the control unit 55 manages resources (allocated hardware, code, signal power, allowable interference power) related to allocation of the channel element 57 to the receiving line, monitors the protocol at the base station, and notifies timing information. And management.

Antennas having different high frequency units (RF-UNIT) 51 for a sector (wide-angle sector) and high frequency units (RF-UNIT) 52 and 53 for a-1 and a-2 sectors (narrow angle sector), respectively Receive the signal via. The signal received by the antenna of each sector is filtered and downconverted by the high frequency units 51 to 53, and then distributed to the signal distributor 58, and the received signal is demodulated by each channel element 57. . At this time, the synthesis of the signals received by the antenna of the wide-angle sector and at most one narrow-angle sector in each channel element is performed. The received power for each sector and Eb / No at each channel element [ratio between energy Eb of each information bit and noise spectral density (No)] are managed by the controller 55, and the rake synthesis and In addition to being power control information to the wireless terminal, power distribution for each W-sector and N-sector in the transmission system is reflected.

5. Control of line (channel) unit of base station

5-1. Configuration of base station of line unit

In the present invention, the reception power for each W-sector and N-channel sector is monitored. This is done to each line level, rake synthesis is performed, and an index of parameter setting at the time of synthesizing (distributing at the line level) of transmission power for each W / N-sector is used. This control is calculated based on the received power for each W / N-sector, Eb / No, etc. for each channel element, and is exchanged for control information on the transmitting side through the control unit.

7 shows a configuration diagram of a line unit control function of a base station according to the present invention.

In the circuit (channel) unit, a signal distributor 71 for each channel and a channel element receiver 72 for each channel as a reception system, a signal synthesizer 76 for the transmission system, a switch 73, and a channel for each channel. An element transmission system 74 is provided, and a control unit 75 is provided. The channel element receiver 72 includes a demodulator 721 including a rake receiver, a pseudo noise generator 722 for operating it, and a deinterleaver and decoder (decoder) 723. ). The channel element transmission system 74 includes an Eb / No sensor 741, a PN generator 742, a digital power control unit digit-pw 743, an interleaver and an encoder. 745, a digital modulator 746, and a gain unit 747.

In addition, each element of FIG. 7 corresponds to the element of FIG. 4 and FIG. 5, The correspondence relationship is shown using () in FIG. In addition, in the elements in FIGS. 4 and 5, elements unnecessary for the description of line-level control are omitted.

5-2. Operation of receiver and transmitter

First, the operation of the reception system will be described.

The received signal at the antenna of each sector from a certain wireless terminal is amplified in each high frequency unit, downconverted in frequency, and transmitted to the signal distributor 71.

The main functions of the signal distributor 71 are filtering, gain adjustment, sampling for digital signal conversion, and distribution of the signal to each channel element. The channel element receiving system 72 is input as a signal in which these processes are performed. The signal distributing unit 71 searches and tracks a code with respect to the received signal of each sector, allocates demodulation of a received signal of a specific code sequence to the channel element receiving system 72, and distributes the signal. The received signals of the plurality of narrow angle sectors are not input to one channel element receiving system 72. When no received signal is detected in any narrow angle sector, only the wide angle sector distributes the received signal to the channel element receiving system 72.

The channel element receiving system 72 performs despreading, rake combining, and error correction decoding of the received signal. The operation is managed by the control unit 75. An operation related to the setting of power is connected to the transmission system through the control unit 75. The pseudo noise generator 722 outputs a PN code for identifying a wireless terminal or a wireless line. If the demodulator 721 determines that the signal is a signal from which sufficient Eb / No is obtained, it locks the sign of the pseudo noise generator 722 and its phase, and the control unit 75 can assign a line to the channel element 72. [Channel Element Assignment Signal 752; CE Assignment]. The demodulation output from the demodulator 721 is transmitted to the deinterleaver and the decoder 723, and based on the interleaved signal, the error correction is performed by the decoder.

In addition, the channel element receiver 72 has a function of a power control loop for controlling uplink (uplink line) transmission power and downlink (downlink line) transmission power, and a function of estimating power received in units of sectors. This will be described later.

Next, the operation of the transmission system will be described.

In the channel element transmission system 74, error correction encoding and interleaving are performed in the interleaver and the encoder 745 for the transmitted information. By the instruction from the control unit, the pseudo noise generator 742 assigns a code such as a PN code for each user. Digital modulator 746 spreads using the assigned code. In this process, insertion of the uplink power control bit 744 is performed by the Eb / No sensor 741. The gain unit 747 is a part for determining the gain of the digital signal.

5-3. Power control

(1) power control loop

The power control loop includes a power control loop of uplink (wireless terminal transmission) and downlink (base station 1 transmission). Power control of the uplink compares the Eb / No of the received signal demodulated by the demodulator 721 with a threshold by the Eb / No sensor 741 and, accordingly, adds an uplink power control bit 744 to the transmitted signal. Set (Link Uplink Pw-Ctrl Bit). The wireless terminal adjusts the transmit power in accordance with this bit.

On the other hand, since the power of the downlink cannot be measured by the base station 1 itself, it is necessary to report it from the wireless terminal. In this embodiment, the wireless terminal inserts the downlink power control bits in the same manner as the wireless terminal inserts the uplink power control bits in the base station 1. The base station 1 extracts the power control bits from the demodulation output from the demodulator 721 and extracts the result of the extraction downlink power control bits (Extract Downlink Pw-Ctrl) through the control unit 75 to the channel element transmission system 74. Bit) is transmitted as a signal 751. The transmission system also adjusts the transmit power (W-sector and N-sector) of the corresponding channel according to this bit by a predetermined ratio.

(2) sector transmit power distribution

A method of allocating the W-sector and the N-sector of the transmission power ratio of data on the traffic channel of the base station will be described with reference to FIG.

Antennas for the W-sector and the N-sector receive the signal (901). The signal distributor 71 identifies a code channel of a signal having a received power exceeding a certain threshold, and reports the code and the received power to the controller 75 (902). The control unit 75 records the report from the signal distribution unit 71 in the code table for each code channel (903). If there are reports from two N-sectors in one code channel (904), the control unit selects the N-sector with the strongest received power (905).

The demodulator 721 has a plurality of fingers (receiving circuits corresponding to multipaths), and is assigned one multipath component, that is, a signal from the W-sector and a signal from the N-sector, to one pinker. The demodulator calculates the received power for each finger (906). The demodulator reports the estimated signal power for each finger and the sector that received the signal as a signal 753 to the controller.

The control unit aggregates the received power for each channel and classifies it for each sector. The power distribution value in the sector of the received power at this time is used as the power distribution ratio between sectors of the transmission system as it is (907). This information is input 908 to the power control circuit Dig-Pw Ctrl 743 of the transmission channel element 74.

The transmission signal is error corrected + interleaved 745 and information modulated 746. The gain control / power distribution circuit 747 adjusts the gain of the transmission power for each channel based on the information from the power control circuit Dig-Pw Ctrl 743. At that time, signals are separated for each sector, and power is distributed for each sector according to the power ratio received in step 908 (909).

Thereafter, the path between the channel element 74 and the signal combiner 76 is switched by the switch 73, and the signals of each sector are complex modulated in the high frequency unit RF-UNIT and transmitted from the antenna 910 .

The control unit 75 executes steps 903 to 908 at regular intervals, and the transmission power ratio is updated each time.

In the flowchart shown in FIG. 9, even when the signal is received only by the antenna for W-sector or when the signal received by the antenna for N-sector is very weak (that is, when the wireless terminal is covered only by the W-sector). Valid. In this case, signal transmission is performed using an antenna of only the W-sector.

9 is similarly applied to the case where only one N-sector is present or when three or more are present.

The transmission power distribution between the N-sector and the W-sector may be any fixed ratio, regardless of the received power strength as shown in FIG.

6. Other Embodiments

6-1. Directional control

As mentioned above, although the method of performing power control by the position of a wireless terminal was demonstrated, it can apply other than this. For example, the direction, angle, and / or shape of each sector may be set and changed based on the positional distribution and / or statistical data of the wireless terminal. Such setting and changing can be performed by providing a control unit for controlling the direction and directivity of the antenna of the input / output unit 10. In addition, these controls may be combined with the above-described power control.

6-2. Polarization diversity function

For example, by applying orthogonal polarization between the W-sector and the N-sector, the line quality can be improved. In this case, the base station 1 sets the power distribution per user line in the W-sector and the N-sector and transmits the signals by separating them into polarized waves, while the wireless terminal uses a receiver having a polarization separation synthesis function in the wireless terminal. By providing the polarization, polarization diversity can be realized.

8 shows a configuration diagram of a base station transmission system having a polarization transmission function.

The difference from the configuration of the base station transmission system shown in Fig. 4 is that the polarization units 81 to 83 are provided in the high frequency units 41 to 43, respectively. Here, as an example, a polarization unit 81 for providing V (vertical) polarization for the W-sector is provided, while a polarization unit 82 for giving H (horizontal) polarization for the N-sectors 8, 9 is provided. 83) are provided respectively. The same polarization unit may be installed in the base station receiver. In addition, any sector may be suitably vertically or horizontally polarized, and other polarization methods such as circular polarization may be applied.

6-3. Other nested layouts

In the above description, the superposition is realized by the wide-angle sector and the narrow-angle sector, but the present invention can be applied in addition to this.

In the example of FIG. 10, a small radius (small sector) 102 and 103 are superposed on a large radius (large sector) 101. In this case, the RF unit and the antenna are separated from the base station. The signal synthesizing unit and the signal distribution unit are mounted in one base station. 1 and 10, when a plurality of small sectors (or N-sectors) is included in one large sector (or W-sector), the small sectors or the N-sectors and the coverages are not disposed so as not to overlap each other. You must.

6-4. etc

In the above embodiment, both the W-sector and the N-sector are used only for data transmission of the traffic channel of the base station, but both sectors are used for data transmission of all channels including the overhead channel (pilot channel, paging channel, etc.). You can also use

In the above-described embodiment, the case where the IS-95 is employed has been described, but the present invention can be applied to other CDMA system or frequency division multiple access (FDMA) system.

According to the present invention, an area in which an N-sector (narrow angle sector) is overlaid among W-sectors (wide-angle sectors) increases in capacity as appropriate to the transmittable power (but the maximum capacity of the overlapping area). Is equivalent to the maximum capacity when operating in one sector). Therefore, by setting one or a plurality of overlapping regions of N-sectors in the W-sectors, the capacity in the W-sectors can be increased spatially.

In addition, according to the present invention, since the W-sector and the N-sector operate at the same frequency and use the same coded channel in synchronization, the multi-sectorization is performed without identifying the sectors regardless of increasing the sectors. In the above, the capacity for the overhead due to the required handoff becomes unnecessary.

Further, according to the present invention, since the W-sector needs to transmit power suitable for traffic other than the region where the N-sector is overlapped with the minimum power required to cover the service area, the transmission power is reduced and the power saving is reduced. We can plan.

Claims (14)

In the wireless communication method, Define a narrow sector that is partially overlaid on the broad sector, A wide range antenna covering the wide range sector and a narrow range antenna covering the narrow range sector are respectively prepared in the base station. For a wireless terminal located within the narrow range sector, transmitting the same signal using both the wide range antenna and the narrow range antenna Wireless communication method characterized in that. The method of claim 1, And receiving signals from the wireless terminal with the wideband antenna and one narrow-range antenna, and synthesizing both received signals to extract a signal. The radio communication method according to claim 1, wherein the radio communication method is performed according to a CDMA method. The method of claim 3, And only a signal of a traffic channel is transmitted using both the wideband antenna and the one narrow range antenna. The method of claim 3, Extracting a downlink power control bit included in a signal from the wireless terminal, and controlling transmission power for the wireless terminal of the wideband antenna and the one narrow range antenna according to the downlink power control bit; Wireless communication method. The method of claim 2, And controlling the transmission power ratio of the wideband antenna and the one narrow range antenna for the wireless terminal according to the strength ratio of the signal from the wireless terminal received by the wideband antenna and the narrow range antenna. . The method of claim 2, A transmission power ratio of the wide range antenna and the narrow range antenna for the wireless terminal is predetermined. The method of claim 2, Rake synthesis is performed when synthesizing the received signals. The method of claim 1, And when there are a plurality of narrow range sectors in one wide sector, the respective coverages of the plurality of narrow range sectors do not overlap positionally. In a wireless communication system comprising a base station and a wireless terminal, The base station, A wide antenna covering a wide sector, A narrow range antenna for covering one or more narrow range sectors partially overlapping the wide sector so that coverage of each narrow range sector does not overlap; A transmitter for transmitting a signal using the wide range antenna and the narrow range antenna; A receiver for synthesizing the received signal of the wideband antenna and the received signal of the one narrow range antenna to extract a signal; A controller for controlling the transmitter and the receiver, The controller controls the transmitter to transmit the same signal from both the wide antenna and the narrow range antenna for a wireless terminal located within the one narrow range sector. Wireless communication system, characterized in that. The method of claim 10, Performing wireless communication in a CDMA manner, wherein the controller of the base station controls the transmitter to transmit only the same signal of the traffic channel signals from both the wideband antenna and the one narrow range antenna. The method of claim 10, And the controller of the base station determines whether or not the wireless terminal is located in the narrow range sector by comparing the strengths of the same signal received by both the wide range antenna and the narrow range antenna. The method of claim 10, The wideband antenna and the one narrow range antenna of the base station transmit different polarized signals, The wireless terminal has an antenna for receiving both polarized signals and a receiver for synthesizing and extracting signals from the received polarized signals. Wireless communication system, characterized in that. In a base station of a wireless communication system, A wide antenna covering a wide sector, A narrow range antenna for covering one or more narrow range sectors partially overlapping the wide sector so that coverage of each narrow range sector does not overlap; A transmitter for transmitting a signal using the wide range antenna and the narrow range antenna; A receiver for synthesizing the received signal of the wideband antenna and the received signal of one narrow-range antenna to extract a signal; A controller for controlling the transmitter and the receiver, The controller controls the transmitter to transmit the same signal from both the wide antenna and the narrow range antenna for a wireless terminal located within the one narrow range sector. A base station of a wireless communication system, characterized in that.