JPH1028282A - Method for judging cell/sector and selecting frequency and base station device and mobile station device in cdma mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for judging a cell/sector and selecting a frequency and a base station device and a mobile station device in a CDMA(code division multiple access) communication system in which the movement of a cell/sector can be properly detected, even when a valid frequency band is different according to the cell/sector, and a frequency band for minimizing an interference power can be selected. SOLUTION: A base station communicates a frequency band which can be used in its own cell/sector to a mobile station (step S11), and the mobile station receives beforehand the pertinent communicated information in waiting, successively measures the full reception power of the frequency band which can be used in the in-cell/sector, and communicates the latest measured value of the full reception power of each frequency band which can be used in the in-cell/sector to the base station at the time of calling and incoming call connection (steps S12-S14). The base station decides the frequency band of a radio line set between the base station and the mobile station from the measured value of the full reception power of each incoming frequency band and the communicated measured value of the full reception power of each outgoing frequency band (step S15).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system of a code division multiple access (hereinafter abbreviated as "CDMA") system for judging cell / sector transition when usable frequency bands differ depending on cells / sectors. The present invention relates to a cell / sector determination and frequency selection method in a CDMA mobile communication system capable of accurately selecting a frequency band of a radio channel, and a base station apparatus and a mobile station apparatus.

[0002]

2. Description of the Related Art In a conventional CDMA digital mobile communication system, the same plurality of frequency bands are used in all cells / sectors, and the cell / sector determination of a mobile station is performed in all frequency bands in all cells / sectors. A pilot channel, that is, a perch channel, which is a carrier for the transmission, is arranged. Thereby, the mobile station receives a pilot channel of an adjacent cell in an arbitrary frequency band,
Cell / sector determination can be performed.

However, in an area where the number of subscribers is small, it is necessary to reduce the number of frequency bands to be arranged in consideration of economical use of the system. If the number of frequency bands to be arranged is reduced in consideration of economy, the usable frequency band differs depending on the cell / sector.

In a conventional CDMA mobile communication system, since a mobile station does not recognize an unusable frequency band in each cell / sector, the mobile station receives a frequency band that is received for cell / sector determination in a destination cell / sector. A situation where no sector is arranged may occur. In this case, the mobile station cannot detect the cell / sector transition because there is no pilot channel of the same frequency band in the destination cell / sector.

On the other hand, the frequency band of the radio channel to be used should be the frequency band with the smallest interference power in the uplink and downlink in terms of radio channel quality. The uplink interference power can always be measured by the base station, but the downlink interference power can be measured only by the mobile station, and varies depending on the position of the mobile station and varies with time. Considering the realization of broadcast information services in future mobile communication services, for example, stock information, weather forecasts, traffic information, etc., it is conceivable that the amount of interference power will be asymmetric between uplink and downlink, Measurement is mandatory. Therefore, it is necessary for the mobile station to measure the downlink interference power for each frequency band usable in the serving cell / sector. Here, the interference power can be considered as the total received power before setting of the radio channel.

[0006] However, since the mobile station does not recognize the available frequency band in the serving cell / sector, it is not possible to measure the total received power for each frequency band. For this purpose, the mobile station only needs to measure the total received power for all conceivable frequency bands, but this will measure up to the unused frequency band, which unnecessarily increases the load on the mobile station. Will be.

[0007]

As described above, in the conventional system, since the usable frequency band differs depending on the cell / sector, the frequency band that the mobile station receives for cell / sector determination is changed to the destination cell. If the mobile station is not located in a cell / sector, there is a problem that the mobile station cannot detect a cell / sector transition.

In order to select the frequency band having the smallest interference power, the mobile station needs to measure the downlink interference power, that is, the total received power, for each frequency band usable in the serving cell / sector. However, since the mobile station does not recognize a frequency band usable in the serving cell / sector, there is a problem that it is not possible to measure the total received power for each frequency band.

[0009] For this purpose, the mobile station only needs to measure the total received power in all conceivable frequency bands. However, this measures the frequency band not in use, thus reducing the load on the mobile station. There is a problem that it will increase meaninglessly.

[0010] The present invention has been made in view of the above,
An object of the present invention is to provide a cell in a CDMA mobile communication system in which a cell / sector transition can be accurately detected even when an available frequency band differs depending on a cell / sector, and a frequency band capable of minimizing interference power is selected. It is an object of the present invention to provide a / sector determination and frequency selection method and a base station apparatus and a mobile station apparatus.

[0011]

In order to achieve the above object, according to the present invention, a base station sequentially transmits its own cell / sector to a mobile station located in a subordinate cell / sector. The mobile station broadcasts available frequency bands for each cell / sector for all neighboring cells / sectors, and the mobile station transmits one frequency band available for each cell / sector for all broadcasted cells / sectors. The gist of the present invention is to measure a desired wave reception level and determine a transition state between a serving cell / sector or a cell / sector based on the measurement result.

According to the first aspect of the present invention, the base station notifies the mobile station of a frequency band usable in its own cell / sector and all adjacent cells / sectors. A desired wave reception level of a pilot channel is measured for one of the available frequency bands, and a transition state between a serving cell / sector or a cell / sector is determined based on the measurement result.

According to a second aspect of the present invention, a base station notifies a mobile station located in a cell / sector under the base station of a frequency band usable in its own cell / sector, and the mobile station waits. The broadcast information is received beforehand, and the total received power of the frequency band that can be used sequentially within the serving cell / sector is measured, and the mobile station can use the serving cell / sector within the serving cell / sector when making a call connection. Notify the base station of the latest measured value of the total received power for each frequency band, and measure the total received power of each uplink frequency band measured by the base station in its own station and the downlink received from the mobile station. The gist of the present invention is to determine a frequency band of a wireless channel to be set between the mobile station and the mobile station by using the total received power measurement value of each frequency band.

According to the second aspect of the present invention, the base station notifies the mobile station of a frequency band available in its own cell / sector, and the mobile station uses the frequency band in the serving cell / sector while waiting. Measures the total received power of the available frequency bands and notifies the base station of the latest measured value when making outgoing / incoming connections.The base station measures the total received power of each uplink frequency band measured by the base station. Then, the frequency band of the radio line set between the mobile station and the mobile station is determined using the measured values of the total received power of the downlink frequency bands notified from the mobile station.

Further, according to the present invention, when the mobile station determines the start of the handover, the handover destination cell is determined based on the information of the available frequency band in the adjacent cell / sector notified from the handover source base station. The total received power is measured for each available frequency of / sector, and the measurement result is notified to the handover destination base station via the handover source base station. The gist of the present invention is to determine a frequency band for setting a radio channel based on the total received power measurement value of a frequency band and the notified total received power measurement value of each frequency band.

According to the third aspect of the present invention, the mobile station determines the handover start based on the information on the available frequency band in the adjacent cell / sector notified from the handover source base station when determining the start of the handover. The total received power is measured for each available frequency of the cell / sector, and the measurement result is reported to the handover destination base station. The handover destination base station measures the total received power of each uplink frequency band measured by itself. A frequency band in which a wireless channel is set is determined based on the measured value and the total received power measured value for each of the notified frequency bands.

According to a fourth aspect of the present invention, a mobile station communicating with a cell / sector under the control of a base station is notified of an available frequency band for each adjacent cell / sector for each cell / sector. The mobile station sequentially measures all the received powers of all the frequency bands available for each adjacent cell / sector for all the broadcasted adjacent cells / sectors, and notifies the base station of the measurement result, When the handover of the mobile station is started, the base station notifies the handover destination base station of the latest measured value of the total received power of all the frequency bands available in the handover destination base station, and the handover destination base station A summary of determining a frequency band for setting a radio channel based on the total received power measurement value of each uplink frequency band measured by the own station and the notified total received power measurement value of each frequency band. To.

According to the fourth aspect of the present invention, the base station broadcasts the frequency band of the adjacent cell / sector to the mobile station, and the mobile station sequentially measures the total received power of the broadcasted frequency band, and performs the measurement. The result is notified to the base station, and when the handover of the mobile station is started, the base station sends the latest measured value of the total received power in all the frequency bands available in the handover destination base station to the handover destination base station. The handover destination base station sets a radio channel based on the total received power measurement value of each uplink frequency band measured by the own station and the notified total received power measurement value of each frequency band. Determine the frequency band.

The present invention described in claim 5 is the same as claim 2.
In the invention according to any one of (1) to (4), in the determination of the frequency band for setting the radio line, if the frequency band in which the total received power is the lowest in the uplink and the downlink is the same, When the frequency band in which the total received power is the lowest in the uplink and the downlink is different, the frequency band in which the total received power in the uplink is the lowest among the frequency bands having the total received power smaller than a predetermined value in the uplink and the downlink, respectively. The point is to select a band.

According to the fifth aspect of the present invention, when the frequency band in which the total received power is lowest in the uplink and the downlink is the same as the frequency band for setting the radio channel, the frequency band is selected. However, when the frequency band in which the total received power is lowest in the uplink and the downlink is different, the total received power in the uplink is the lowest among the frequency bands having the total received power smaller than a predetermined value in each of the uplink and the downlink. A certain frequency band is selected.

Further, according to the present invention, there is provided a base station apparatus comprising: a storage unit for storing, for each cell / sector, a frequency band usable in the own cell / sector and all adjacent cells / sectors; To the mobile station located in the cell / sector under the control of the station, the available frequency band for each cell / sector for the own cell / sector and all adjacent cells / sectors is sequentially read out from the storage means and broadcast. A mobile station device for storing, for each cell / sector, a frequency band broadcast from the broadcast unit; and for each cell / sector among the frequency bands stored in the storage unit. 1
Set the desired signal reception level for the frequency band to all cells /
The gist of the present invention is to have a measuring means for measuring a sector and a judging means for judging a serving cell / sector or a transition state between cells / sectors based on the measurement result.

According to the sixth aspect of the present invention, the base station notifies the mobile station of a frequency band usable in its own cell / sector and all adjacent cells / sectors, and the mobile station transmits the frequency band to each cell / sector. The desired wave reception level is measured for one of the available frequency bands, and the transition state between the serving cell / sector or the cell / sector is determined based on the measurement result.

According to a seventh aspect of the present invention, the base station apparatus comprises:
A storage unit for storing a frequency band usable in the own cell / sector; and a storage unit for storing a frequency band usable in the own cell / sector for a mobile station located in a cell / sector under the own base station. And a notifying means for reading out and notifying from the mobile station apparatus, wherein the mobile station apparatus receives the notifying information in advance while waiting, and receives all the frequency bands available in the serving cell / sector received by the receiving means. There is a measuring means for sequentially measuring the received power and a notifying means for notifying the base station of the latest measured value of the total received power for each available frequency band in the serving cell / sector at the time of outgoing / incoming connection. The base station apparatus is notified from the mobile station by a measuring means for measuring the total received power of each uplink frequency band, and the measured value of the total received power of each uplink frequency band measured by the measuring means and the notifying means. All received power of each frequency band Using measurements and summarized in that and a frequency band determining means for determining a frequency band of the radio channel to be set between the mobile station.

According to the seventh aspect of the present invention, the base station notifies the mobile station of the usable frequency band in its own cell / sector, and the mobile station uses the frequency band in the serving cell / sector while waiting. Measures the total received power of the available frequency bands and notifies the base station of the latest measured value when making outgoing / incoming connections.The base station measures the total received power of each uplink frequency band measured by the base station. Then, the frequency band of the radio line set between the mobile station and the mobile station is determined using the measured values of the total received power of the downlink frequency bands notified from the mobile station.

According to the present invention, the mobile station apparatus performs the handover based on the information on the usable frequency band in the adjacent cell / sector notified from the handover source base station when the mobile station apparatus determines the activation of the handover. Measuring means for measuring the total received power for each available frequency of the destination cell / sector, and notifying means for notifying the measurement result to the handover destination base station via the handover source base station; A measuring means for measuring the total received power of each frequency band in the uplink, and a frequency for determining a frequency band for setting a radio line based on the total received power measurement value for each frequency band notified from the notifying means. The point is to have a band determining means.

According to the present invention, when the mobile station determines that the handover is to be started, the handover destination cell is notified based on information on available frequency bands in adjacent cells / sectors notified from the handover source base station. / Measurement of the total received power for each frequency of the sector, and notifies the measurement result to the handover destination base station. The handover destination base station measures the total received power measurement value of each uplink frequency band measured by itself and the notification. A frequency band for setting a wireless channel is determined based on the measured total received power for each frequency band.

Further, according to the ninth aspect of the present invention, the base station device stores a usable frequency band for each cell / sector for all adjacent cells / sectors, and a cell / slave subordinate to its own base station. For mobile stations communicating within the sector,
Broadcast means for reading out the usable frequency band for each cell / sector from the storage means for all the adjacent cells / sectors and broadcasting the information, wherein the mobile station apparatus broadcasts all the adjacent cells / sectors broadcast from the broadcast means. About adjacent cell /
Measuring means for sequentially measuring the total received power of all frequency bands available for each sector, and notifying means for notifying the base station of the measurement result, wherein the base station apparatus is activated for handover of the mobile station When, the notifying means for extracting the latest measured value of the total received power of all frequency bands available in the handover destination base station from the measurement result notified by the notifying means, and notifying the handover destination base station Have
A measuring means for measuring the total received power of each frequency band in the handover destination base station apparatus, based on the measured value measured by the measuring means and the total received power measured value for each frequency band notified by the notifying means; And a frequency band determining means for determining a frequency band for setting a wireless channel.

According to the ninth aspect of the present invention, the base station broadcasts the frequency band of the adjacent cell / sector to the mobile station, and the mobile station sequentially measures the total received power of the broadcasted frequency band, and performs the measurement. The result is notified to the base station, and when the handover of the mobile station is started, the base station sends the latest measured value of the total received power in all the frequency bands available in the handover destination base station to the handover destination base station. The handover destination base station sets a radio channel based on the total received power measurement value of each uplink frequency band measured by the own station and the notified total received power measurement value of each frequency band. Determine the frequency band.

According to a tenth aspect of the present invention, in the invention according to any one of the seventh to ninth aspects, the frequency band deciding means determines that the frequency band in which the total received power is lowest in the upstream and downstream is the same. In determining the frequency band, if the frequency band where the total received power is lowest in the uplink and downlink is different, of the frequency band having a total received power smaller than a predetermined value in each of the uplink and downlink, The gist of the present invention is to have means for determining a frequency band in which the total received power is the lowest for the uplink.

According to the tenth aspect of the present invention, when the frequency band in which the total received power is the lowest in the uplink and the downlink is the same as the frequency band for setting the radio channel, the frequency band is selected. However, when the frequency band in which the total received power is lowest in the uplink and the downlink is different, the total received power in the uplink is the lowest among the frequency bands having the total received power smaller than a predetermined value in each of the uplink and the downlink. A certain frequency band is selected.

[0031]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 respectively show a cell / cell in a CDMA mobile communication system according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a base station and a mobile station that implement a sector determination and frequency selection method.

The base station apparatus shown in FIG. 1 has an antenna 21 for receiving a radio signal from a mobile station and transmitting a radio signal to the mobile station. A signal from the mobile station received by the antenna 21 is transmitted and received. The signal is supplied to a demodulation circuit 27 via a distribution circuit 23 and a reception circuit 25, where despreading using a spreading code and normal demodulation are performed. The demodulated signal is supplied to a decoding circuit 29, where the transmission signal and the control signal are decoded. The control signal is supplied to a control circuit 31, and the transmission signal is transmitted to a higher-level switching center via a wire transmission circuit 39. Sent.

The transmission signal from the exchange to the base station is:
The signal is received by the wire line receiving circuit 41, decomposed into a transmission signal and a control signal, the control signal is supplied to the control circuit 31, and the transmission signal is encoded by the encoding circuit 33 together with the control signal from the control circuit 31, and the modulation circuit After being subjected to primary modulation and spreading modulation by a spreading code at 35, the signal is transmitted from the antenna 21 to the mobile station via the transmission circuit 37 and the transmission / reception distribution circuit 23.

A memory circuit 55 and a measuring circuit 57 are connected to the control circuit 31. The memory circuit 55 stores the frequency bands usable in the own cell / sector and all adjacent cells / sectors for each cell / sector. The measuring circuit 57 measures the total received power in each of the upstream frequency bands.

The mobile station apparatus shown in FIG. 2 has an antenna 1 for receiving a radio signal from the base station and transmitting a radio signal to the base station. The signal received from the base station by the antenna 1 is transmitted and received. The signal is supplied to the demodulation circuit 7 via the distribution circuit 3 and the reception circuit 5, where despreading using a spreading code and normal demodulation are performed. The demodulated signal is supplied to a decoding circuit 9, where the transmission signal and the control signal are decoded,
The control signal is supplied to the control circuit 11, and the transmission signal is supplied to the man-machine interface.

A transmission signal such as a voice signal from the man-machine interface is supplied to an encoding circuit 13 together with a control signal from a control circuit 11 and encoded. The modulation circuit 15 performs primary modulation and spread modulation by a spread code. The antenna 1 is transmitted through the transmission circuit 17 and the transmission / reception distribution circuit 3.
Transmitted to the base station.

The control circuit 11 is connected to a storage circuit 51 and a measurement circuit 53. The storage circuit 51 sets a cell / sector notified from the base station and a frequency band usable in all adjacent cells / sectors to the cell / sector. The data is stored for each sector, and the measuring circuit 53 measures a desired wave reception level and a total reception power of a frequency band usable in a serving cell / sector and an adjacent cell / sector.

In the CDMA mobile communication system having the base station apparatus and the mobile station apparatus configured as described above, all cells / sectors use a plurality of frequency bands,
A pilot channel for cell / sector determination of a mobile station is arranged in all frequency bands in all cells / sectors, and the mobile station receives a pilot channel of an adjacent cell in an arbitrary frequency band and performs cell / sector determination. However, in order to economize the system in an area with a small number of subscribers, the frequency band allocated to the cell / sector in such an area is reduced, and the frequency band usable by the cell / sector is reduced. Is different. Then, the mobile station does not recognize, that is, does not store the usable frequency band that differs depending on each cell / sector.

In such a state, when the mobile station is in the cell /
In this embodiment, the base station stores a frequency band usable in its own cell / sector and all adjacent cells / sectors in the storage circuit 55 so that the transition of the sector can be properly detected.
The stored frequency band is read out for each sector, and the stored frequency band is read out, and the coding circuit 33, the modulation circuit 35, the transmission circuit 37, and the transmission / reception are transmitted to the mobile station located in the cell / sector under the base station. The information is transmitted from the antenna 21 via the distribution circuit 23 to be notified.

The mobile station transmits all broadcasted cells /
The available frequency band of the sector is received by the control circuit 11 via the antenna 1, the transmission / reception distribution circuit 3, the reception circuit 5, the demodulation circuit 7, and the decoding circuit 9, and stored in the storage circuit 51. Then, from the stored frequency band, the measuring circuit 53 measures the desired wave reception level for one of the available frequency bands for each cell / sector from this stored frequency band. Based on this measurement,
The mobile station can accurately determine the serving cell / sector or the transition status between the cells / sectors. As a specific determination method, the cell / sector having the maximum desired wave reception level measurement value may be determined as the serving cell / sector.

FIG. 3 is a flowchart showing a process according to another embodiment of the present invention. The process of the present embodiment is to select a frequency band of a radio channel set between the base station and the mobile station when the mobile station is connected to the mobile station so that interference power is minimized.

In FIG. 3, the base station reads out, from the storage circuit 55, a frequency band usable in its own cell / sector to a mobile station located in a subordinate cell / sector and notifies it (step S11). The mobile station receives the available frequency band notified from the base station in advance while waiting, and stores it in the storage circuit 51 (step S12). Then, the mobile station reads the usable frequency band in the serving cell / sector from the storage circuit 51 and measures the total received power in this frequency band in the measuring circuit 5.
The measurement is sequentially performed at step 3 (step S13).

At the time of outgoing / incoming call connection, the mobile station performs step S1.
The base station is notified of the latest measured value of the total received power for each available frequency band in the serving cell / sector measured in step 3 (step S14). The base station communicates with the mobile station based on the total received power measurement value of each uplink frequency band measured by the own station and the total received power measurement value of each downlink frequency band notified from the mobile station in step S14. The frequency band of the wireless line set between them is determined so that the interference power is minimized (step S15).

FIG. 4 is a flowchart showing a process according to still another embodiment of the present invention. The processing of the present embodiment is to select a frequency band of a wireless channel set between the handover destination base station and the mobile station at the time of handover of the mobile station so that interference power is minimized.

In FIG. 4, when the mobile station determines that the handover has been started, the mobile station uses each available cell / sector of the handover destination cell / sector based on the information of the available frequency band in the adjacent cell / sector broadcast from the handover source base station. The total received power is measured for each frequency band (step S21). Then, the mobile station notifies the measurement result to the handover destination base station via the handover source base station (step S2).
2).

The handover destination base station compares the total received power measurement value of each uplink frequency band measured by itself with the measured value of step S
Based on the total received power measurement value for each frequency band notified by the mobile station at 22, the frequency band of the radio line set between the mobile station and the mobile station is determined so that the interference power is minimized (step S 23). .

FIG. 5 is a flowchart showing a process according to another embodiment of the present invention. The process of the present embodiment selects the frequency band of the radio line set between the handover destination base station and the mobile station at the time of the handover of the mobile station in the same manner as the process of FIG. However, in the present embodiment, the handover is smoothly performed by notifying the base station in advance of the measured values of all the received powers of all the available frequency bands for the adjacent cells / sectors measured by the mobile station before starting the handover. Is what you do.

In FIG. 5, the base station broadcasts the available frequency band for each cell / sector for all adjacent cells / sectors to the mobile station communicating within the cell / sector under its control. Step S31). The mobile station sequentially measures the total received power of all the frequency bands available for each adjacent cell / sector for all the broadcasted adjacent cells / sectors (step S32), and notifies the base station of this measurement result. (Step S33).

When the handover of the mobile station is started, the base station notifies the handover destination base station of the latest measured value of the total reception power in all the frequency bands usable in the handover destination base station ( Step S34). The handover destination base station communicates with the mobile station based on the total received power measurement value of each frequency band measured by the own station and the total received power measurement value of each frequency band notified in step S34. The frequency band of the wireless line to be set is determined so that the interference power is minimized (step S35).

Next, referring to FIG. 6, in each of the above-described embodiments, the mobile station moves with the base station based on the total received power measurement value of each uplink frequency band and the total received power measurement value of each downlink frequency band. A method of determining a frequency band of a radio line set between the station and the station will be described.

FIG. 6 is a graph in which the abscissa represents the upward and downward frequencies F1,
F2 and F3 are shown, and the measured value of the total received power is shown on the vertical axis. The upstream and downstream F1, F2, and F3 do not have the same frequency, but simply indicate a pair of frequencies.

In FIG. 6, three frequencies F1, F2 and F3 are shown as up and down frequency bands, respectively.
From among these three frequency bands, the frequency band with the lowest interference power is selected as the frequency band of the radio channel set between the base station and the mobile station. As shown in FIG.
A predetermined value is defined for the total received power, and a frequency band having the total received power larger than the predetermined value is excluded and is not selected. That is, in the downlink frequency band, the total received power of the frequency F2 exceeds this predetermined value, so that the frequency band of the frequency F2 is not selected.

It is most desirable if there is a frequency band in which the total received power in both the uplink and downlink is the lowest, and this frequency band is selected. In FIG. 6, however, there is no minimum frequency band in both. . Therefore, when the frequency band in which the total received power is the lowest in the uplink and the downlink is different, the uplink total received power is the lowest among the frequency bands having the total received power smaller than the predetermined value in the uplink and the downlink. Is selected.

The reason for selecting the frequency band having the lowest total received power will be described. To obtain the required reception quality, the larger the amount of interference power, that is, the larger the total received power, the larger the required transmission power. In particular, an increase in the uplink transmission power leads to a faster consumption of the battery of the mobile station. Therefore, it is necessary to reduce the uplink transmission power as much as possible. Therefore, in order to save the battery of the mobile station, it is necessary to select a frequency band in which the total received power in the uplink is lower than that in the downlink.

Accordingly, in the example of FIG. 6, the frequency F2 is equal to or higher than the predetermined value, so that the frequency F2 is excluded, and the remaining frequency band is F
In F1, F3, F3 having the smaller total received power is selected from the upstream frequencies F1, F3.

[0057]

As described above, according to the present invention,
The base station notifies the mobile station of a frequency band available in its own cell / sector and all adjacent cells / sectors, and the mobile station transmits a pilot channel for one of the frequency bands available for each cell / sector. It is possible to measure the reception level of the desired wave, and to accurately determine the transition status between the serving cell / sector or the cell / sector based on the measurement result.

Further, according to the present invention, the base station notifies the mobile station of the frequency band available in its own cell / sector, and the mobile station transmits the frequency band available in the serving cell / sector during standby. The base station reports the latest measured value to the base station at the time of outgoing / incoming connection. By using the total received power measurement value of each of the notified frequency bands in the downlink, the frequency band of the radio line to be set with the mobile station is determined. It is possible to measure the total received power and select the frequency band with the smallest interference power.

Further, according to the present invention, the mobile station, based on the information on the available frequency band in the adjacent cell / sector notified from the handover source base station when judging the start of the handover, based on the information of the available frequency band in the adjacent cell / sector. The total received power is measured for each available frequency, the measurement result is notified to the handover destination base station, and the handover destination base station measures the total received power measurement value of each uplink frequency band measured by itself and the Since the frequency band for setting the radio channel is determined based on the total received power measurement value for each notified frequency band, the total received power for each frequency band is measured without increasing the load on the mobile station, and the interference is measured. The frequency band with the lowest power can be selected.

According to the present invention, the base station broadcasts the frequency band of the adjacent cell / sector to the mobile station, and the mobile station sequentially measures the total received power in the broadcast frequency band, and notifies the base station of the measurement result. In addition, when the handover of the mobile station is started, the mobile station notifies the handover destination base station of the latest measured value of the total reception power of all the frequency bands available at the handover destination base station, and Since the base station determines the frequency band for setting the radio channel based on the total received power measurement value of each uplink frequency band measured by itself and the notified total received power measurement value of each frequency band, By measuring the total received power for each frequency band without increasing the load on the mobile station, it is possible to select the frequency band with the smallest interference power.

Further, according to the present invention, when the frequency band in which the total received power is the lowest in the uplink and the downlink is the same as the frequency band for setting the radio channel, the frequency band is selected, and If the frequency band in which the total received power is lowest in the downstream is different, the frequency band in which the total received power is the lowest in the uplink is selected from among the frequency bands having the total received power smaller than a predetermined value in each of the uplink and the downlink. Since the frequency band is selected, the frequency band in which the interference power is the lowest can be selected, and battery saving of the mobile station can be achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a base station that implements a cell / sector determination and frequency selection method in a CDMA mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a mobile station that implements a cell / sector determination and frequency selection method together with the base station of FIG. 1 in a CDMA mobile communication system according to one embodiment of the present invention.

FIG. 3 is a flowchart illustrating a process according to another embodiment of the present invention.

FIG. 4 is a flowchart illustrating a process according to still another embodiment of the present invention.

FIG. 5 is a flowchart illustrating a process according to another embodiment of the present invention.

FIG. 6 is a diagram showing a wireless channel set between a base station and a mobile station based on the total measured power of each uplink frequency band and the measured total received power of each downlink frequency band in the above embodiments. FIG. 3 is a diagram used to explain a method of determining the frequency band of FIG. 2, in which the horizontal axis indicates the uplink and downlink frequencies, and the vertical axis indicates the total received power measurement value.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 mobile station control circuit 31 base station control circuit 51 mobile station storage circuit 53 mobile station measurement circuit 55 base station storage circuit 57 base station measurement circuit

Claims (10)

[Claims] 1. A base station notifies a mobile station located in a cell / sector under its control of an available frequency band for each cell / sector for its own cell / sector and all adjacent cells / sectors. The mobile station measures a desired signal reception level of a pilot channel serving as a serving cell / sector determination carrier for one of frequency bands usable for each cell / sector for all broadcasted cells / sectors. Based on the measurement result, the serving cell / sector or cell /
CDM characterized by determining a transition state between sectors
A Cell / sector determination and frequency selection method in a mobile communication system. 2. A base station broadcasts a frequency band usable in its own cell / sector to a mobile station located in a subordinate cell / sector, and the mobile station receives the broadcast information in advance while waiting. The mobile station measures the total received power of the frequency band that can be used successively within the serving cell / sector, and the mobile station performs the latest of the total received power of each frequency band that can be used within the serving cell / sector at the time of the call connection. The base station notifies the base station of the measured value, and the base station measures the total received power of each uplink frequency band measured by itself and the measured total received power of each downlink frequency band notified by the mobile station. A frequency band of a radio line set between the mobile station and the mobile station using
Cell / sector determination and frequency selection method in MA mobile communication system. 3. A mobile station, for each available frequency of a handover destination cell / sector, based on information on available frequency bands in adjacent cells / sectors notified from the handover source base station when the mobile station determines activation of handover. Measures the total received power, notifies the measurement result to the handover destination base station via the handover source base station, and the handover destination base station measures the total received power measured value of each uplink frequency band measured by itself and A cell / sector determination and frequency selection method in a CDMA mobile communication system, wherein a frequency band in which a radio channel is set is determined based on the notified total received power measurement value for each frequency band. 4. A base station notifies a mobile station communicating in a subordinate cell / sector of an available frequency band for each cell / sector for all adjacent cells / sectors, and the mobile station performs the notification. The mobile station sequentially measures all the received powers of all the available frequency bands for each of the measured neighboring cells / sectors for each of the neighboring cells / sectors, and notifies the base station of the measurement result. Is started, the latest measurement value of the total received power of all the frequency bands available in the handover destination base station is notified to the handover destination base station, and the handover destination base station measures itself. CDMA mobile communication, wherein a frequency band for setting a radio channel is determined based on the total received power measurement value of each uplink frequency band and the notified total received power measurement value of each frequency band. Cell / sector determination and frequency selection method in the system. 5. In the determination of the frequency band for setting the radio line, if the frequency band having the lowest total received power in the uplink and the downlink is the same, the frequency band is determined to be the frequency band, and the full reception is performed in the uplink and the downlink. When the frequency band having the lowest power is different, the frequency band having the lowest total received power for the uplink is selected from among the frequency bands having the total received power smaller than the predetermined value in each of the uplink and the downlink. The CDM according to any one of claims 2 to 4, wherein
A Cell / sector determination and frequency selection method in a mobile communication system. 6. The base station apparatus allocates a frequency band usable in its own cell / sector and all adjacent cells / sectors to a cell / sector.
A storage means for storing for each sector, and for a mobile station located in a cell / sector under the own base station, the mobile station can be used for each own cell / sector and all adjacent cells / sectors for each cell / sector. A notifying unit for reading out and notifying the frequency band from the storage unit, wherein the mobile station device accumulates the frequency band notified by the notifying unit for each cell / sector; Measuring means for measuring a desired wave reception level in one frequency band for all cells / sectors for each cell / sector in the selected frequency band, and based on the measurement result, serving cell / sector or inter-cell / sector A base station apparatus and a mobile station apparatus in a CDMA mobile communication system, comprising: determination means for determining a transition state. 7. A base station apparatus stores storage means for storing a frequency band usable in its own cell / sector and a mobile station located in a cell / sector under its own base station. And a notifying unit for reading and notifying a frequency band usable in the storage unit from the storage unit. The mobile station device includes a receiving unit for receiving the notification information in advance while waiting, and a serving cell received by the receiving unit. Means for sequentially measuring the total received power in the frequency band available in the / cell and the latest measured value of the total received power in each frequency band available in the serving cell / sector at the time of outgoing / incoming connection. The base station apparatus includes: a measuring unit that measures the total received power of each uplink frequency band; and a measured value of the total received power of each uplink frequency band measured by the measuring unit. And notified from the mobile station by the notifying means. Using total received power measurements for each frequency band of the downlink, and having a frequency band determining means for determining a frequency band of the radio channel to be set between the mobile station C
A base station device and a mobile station device in a DMA mobile communication system. 8. The mobile station apparatus according to claim 1, wherein the mobile station apparatus determines the activation of the handover based on the information on the available frequency band in the adjacent cell / sector notified from the handover source base station. Measuring means for measuring the total received power every time, and notifying means for notifying the measurement result to the handover destination base station via the handover source base station. Measuring means for measuring the total received power, and frequency band determining means for determining a frequency band for setting a radio channel based on the total received power measurement value for each frequency band notified from the notifying means. A base station device and a mobile station device in a CDMA mobile communication system. 9. A base station apparatus according to claim 1, wherein said base station device stores a usable frequency band for each cell / sector with respect to all adjacent cells / sectors, and said mobile station communicates in a cell / sector under said base station. And a notifying unit for notifying the station of a usable frequency band for each cell / sector for all adjacent cells / sectors from the storage unit and notifying the mobile station unit. A measuring unit for sequentially measuring the total received power of all the available frequency bands for each of the adjacent cells / sectors, and a notifying unit for notifying the base station of the measurement result. When the handover of the mobile station is started, the latest measurement value of the total reception power of all the frequency bands available in the handover destination base station is obtained from the measurement result notified by the notification means. And a notifying unit for notifying the handover destination base station, the handover destination base station device includes a measuring unit that measures the total received power of each uplink frequency band, and a measurement value measured by the measuring unit. A base station apparatus for a CDMA mobile communication system, comprising: a frequency band determining unit that determines a frequency band for setting a radio channel based on a total received power measurement value for each frequency band notified by the notifying unit. And mobile station equipment. 10. The frequency band determination means, when the frequency band having the lowest total received power in the uplink and the downlink is the same, determines the frequency band, and determines that the total received power is the minimum in the uplink and the downlink. When a certain frequency band is different, a means for determining a frequency band in which the total received power is the lowest in the uplink among the frequency bands having the total received power smaller than the predetermined value in each of the uplink and the downlink is provided. A base station apparatus and a mobile station apparatus in the CDMA mobile communication system according to any one of claims 7 to 9.