JP2000261370A - Mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify and output information about an allowed transmission rate to a user, for instance, even before connecting a channel with the opposite communication party in a mobile station performing radio communication with a base station according to a CDMA system using plural transmission rates. SOLUTION: Receiving means 1 and 2 receive information about incoming interference quantity in incoming communication to a base station according to a notifying signal from the base station, a calculating means consisting of a transmission rate detecting means 4 and a controlling part 6 finds information about the allowed transmission rate on the basis of the received information and a notifying means 5 notifies and outputs the found information to a user. Furthermore, another configuration such as to detect, e.g. outgoing interference quantity and to find information about a transmission rate or the like can also be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile station that wirelessly communicates with a base station by a CDMA system using a plurality of transmission rates (multi-rate), and more particularly, to a mobile station that broadcasts information about a transmission rate to a user. About the bureau.

[0002]

2. Description of the Related Art For example, in a wireless communication system using a CDMA (code division multiple access) system known as one of multiple access systems in a mobile communication system, a transmitting side spreads a signal to be transmitted by a spreading code. On the other hand, the receiving side demodulates the received signal by despreading the received signal with the same spreading code as the spreading code. The spreading code is a code obtained from a predetermined polynomial called a spreading code, for example.

FIG. 11 shows an example of a system using a sector cell configuration as a specific example of such a wireless communication system. FIG. 1 shows a base station 51 and a plurality of mobile stations (for example, wireless portable terminals) 52 and 53 that perform wireless communication by a CDMA method using a plurality of transmission rates, and an interference that generates an interference signal that interferes with the wireless communication. Wave source 54
And a communicable area (cell) 5 of the base station 51.
For example, 5 is divided into several sectors in an area with a large traffic volume.

In such a system, a plurality of mobile stations (for example, a plurality of users) 52 and 53 share the same frequency band at the same time and perform radio communication with the base station 51. Other mobile station 53 for the communication of
Are transmitted as interference signals. Therefore, for example, when various data communications such as packet communications are performed, the maximum transmission rate allowed for a certain mobile station 52 is:
The magnitude of an interference signal due to a radio signal from another mobile station 53, an interference signal from an interference wave source 54, or the like that is simultaneously communicating using the same line as the mobile station 52 (for example, a line having the same carrier frequency band). Limited by

[0005] That is, when the interference signal is large, the maximum transmission rate permitted to the mobile stations 52 and 53 is relatively low, while when the interference signal is small, the mobile stations 52 and 53 are small.
The maximum transmission rate allowed for 3 is relatively high. The magnitude of such an interference signal depends on, for example, the mobile station 5 accommodated in the base station 51 (each sector in the case of a sector cell configuration).
Since the transmission rate varies according to the number (for example, the amount of traffic) of the mobile stations 52 and 53 and the number of nearby interference sources 54, the transmission rates allowed for the mobile stations 52 and 53 are temporally determined according to these conditions. Changes to

[0006] For example, Japanese Patent Application Laid-Open No. 7-250379 discloses that when the number of mobile stations accommodated in a base station increases, the amount of interference increases and communication quality deteriorates. Describes that in downlink communication from a base station to a mobile station, it is necessary to increase the length of a spreading code for one symbol to maintain communication quality. For example, Japanese Patent Application Laid-Open No. 6-253364 describes a radio access communication system such as a CDMA cellular radio telephone system and a call traffic transmission method.

[0007]

However, in a conventional mobile station, when a user starts data communication with a communication partner (for example, another mobile station) via the base station by the mobile station, the user moves. There has been a problem that information regarding the transmission rate allowed by the station cannot be known before starting the data communication.

Specifically, for example, a user actually connects a line between a mobile station and a communication partner to start data communication, and estimates the magnitude of the transmission rate from the progress of the data communication. Although it was possible, in this case, there was a problem that the line had to be connected once. That is, for example, even if the user considers to stop data communication if the line is congested and the permissible transmission rate is low, the user must establish a line between the mobile station and the communication partner. The user has to connect once to exchange some data with the communication partner, which is troublesome for the user and also causes a problem that a call charge is required.

[0009] Further, even when data communication is performed by a mobile station, for example, there has been no idea that information relating to the current transmission rate in wireless communication is broadcast to the user. There has been a demand for a mobile station capable of broadcasting and outputting.

The present invention has been made to solve such a conventional problem. For example, even before connecting a line with a communication partner, information on an allowable transmission rate is provided to a user. It is an object of the present invention to provide a mobile station capable of broadcasting and outputting information. Another object of the present invention is to provide a mobile station capable of notifying a user of information on a current transmission rate in wireless communication, for example, when performing data communication with a communication partner. And

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, a mobile station according to the present invention performs radio communication with a base station by a CDMA system using a plurality of transmission rates.
Information on the permissible transmission rate is broadcast and output as follows. That is, the receiving means receives information on the amount of uplink interference in the uplink communication to the base station by a broadcast signal from the base station, and determines the information on the permissible transmission rate based on the information received by the determining means. The information determined by the means is notified and output to the user.

Therefore, for example, information on an allowable transmission rate is calculated based on information on the amount of uplink interference broadcast from a base station to a plurality of mobile stations.
For example, even before connecting the line with the communication partner,
Information on the permissible transmission rate can be reported and output to the user, thereby improving the usability for the user.

In the mobile station according to the present invention, when performing radio communication with a base station that wirelessly transmits broadcast information using a spreading code that differs for each transmission rate by a CDMA method using a plurality of transmission rates, Information on the permissible transmission rate is broadcast and output as follows. That is,
A receiving unit receives the broadcast information, an indexing unit determines information on an allowable transmission rate based on a spread code of the received broadcast information, and outputs the information determined by the broadcast unit to a user.

Therefore, for example, since information on the permissible transmission rate is calculated based on broadcast information broadcast from the base station to a plurality of mobile stations, for example, before connecting a line to a communication partner, Even if there is, information on the permissible transmission rate can be broadcast to the user.

Further, in the mobile station according to the present invention, a CDM using a plurality of transmission rates with a base station which wirelessly transmits broadcast information using a spreading code having a different cycle for each transmission rate.
When wireless communication is performed by the A method, information on an allowable transmission rate is broadcast and output as follows. That is, a receiving unit receives the broadcast information, an indexing unit determines information on an allowable transmission rate based on a cycle of a spread code of the received broadcast information, and notifies the user of the information determined by the broadcast unit. Output.

Therefore, for example, information on an allowable transmission rate is calculated based on broadcast information broadcast from the base station to a plurality of mobile stations, so that, for example, before connecting a line with a communication partner, Even if there is, information on the permissible transmission rate can be broadcast to the user.

In the mobile station according to the present invention, when wirelessly communicating with a base station by a CDMA system using a plurality of transmission rates, information on a permissible transmission rate is broadcast and output as follows. That is, the receiving means receives information on the permissible transmission rate by a broadcast signal from the base station, and broadcasts and outputs the information on the information received by the broadcast means to the user.

[0018] Therefore, for example, since information on the permissible transmission rate is received via a signal broadcast from the base station to a plurality of mobile stations, for example, before a line is connected to a communication partner. However, it is possible to notify and output the information on the information to the user.

In the mobile station according to the present invention, when wirelessly communicating with a base station by a CDMA system using a plurality of transmission rates, information on the permissible transmission rate is broadcast and output as follows. That is, the receiving unit receives the radio signal, detects the amount of downlink interference in the downlink communication from the base station based on the signal received by the downlink interference amount detecting unit, and permits the downlink interference amount based on the downlink interference amount detected by the indexing unit. The information on the transmission rate to be transmitted is determined, and the information determined by the notification means is output to the user by notification.

Therefore, information on the permissible transmission rate is calculated based on the detected amount of downlink interference.
For example, even before connecting the line with the communication partner,
Information on the permissible transmission rate can be broadcast to the user.

Further, the mobile station according to the present invention broadcasts and outputs information on the current transmission rate as follows when wirelessly communicating with the base station by the CDMA method using a plurality of transmission rates. That is, the indexing means determines information on the current transmission rate in the wireless communication, and notifies and outputs the information determined by the notifying means to the user.

Therefore, for example, when data communication is performed with a communication partner, information on the current transmission rate in wireless communication can be notified to the user and output, thereby improving the usability for the user. Can be better.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings. Note that the mobile station described in the following embodiments has a function of performing wireless communication using a plurality of transmission rates variably, and performs wireless communication with a base station by a CDMA method using a plurality of transmission rates. Here, the transmission rate refers to the speed of data communication, and specifically refers to, for example, the amount of data that can be communicated in a certain time (for example, one second or the like). In the following embodiment, for example, FIG.
1, a description will be given of an example in which a sector cell configuration is used in a wireless communication system including mobile stations and base stations.

A first embodiment of the present invention will be described. FIG. 1 shows an example of a communication device provided in a mobile station according to the present invention. The communication device includes a radio signal (RF signal).
An antenna 1 for receiving a signal, a radio unit 2 for amplifying a signal received by the antenna 1 and converting the signal into a baseband signal,
A baseband signal processing unit 3 for despreading the baseband signal, a transmission rate detection function 4 for detecting an allowable transmission rate, and a notification unit 5 for notifying and outputting information on the detected transmission rate to a user. And a control unit 6 for controlling the processing units 1 to 5 and the like. Note that the transmission rate detection function 4 of the present example is provided in the baseband signal processing unit 3.

Here, since the main part of the mobile station according to the present invention is configured to broadcast and output the information by, for example, determining the information on the transmission rate. In this example, the transmission rate detecting function 4 according to the configuration is mainly used. And the configuration of the notification unit 5 will be described, and the description of the details of other configurations will be omitted.

FIG. 2 shows an example of a broadcast signal frame wirelessly transmitted from the base station of this embodiment using the broadcast channel (BCCH). The broadcast signal frame includes identification information (BI). , Transmission power information, frame number (SFN: System F
rame Number), information on the amount of uplink interference power, information on the start, continuation, and end of data (W), control information, and tail bits (to clear all registers once when performing convolutional coding. ALL0) (TA) and cyclic check characters (CRC). The information on the amount of uplink interference power, SFN, and the like are information whose contents change with time.

Here, in the wireless communication of the present embodiment, for example, in addition to an individual physical channel for exchanging data in a physical channel, a common control for exchanging control data and the like common to each mobile station. A channel is provided. In this example, the broadcast channel described above is provided in the common control channel, and the base station of this example uses this broadcast channel to provide system-based control information for each cell or sector in a communicable area. To a plurality of mobile stations.

The above-described uplink interference power will be described in detail. In the CDMA system used in this example, a different communication channel (physical channel) is formed for each spreading code used for spreading modulation. Then, for example, a different spreading code is assigned to each mobile station (for example, each user), and each mobile station wirelessly communicates with the base station using the spreading code assigned to itself. The destination data can be recognized, and multiplex communication between the base station and a plurality of mobile stations is realized.

As shown in the above-mentioned conventional example, in such communication, a plurality of mobile stations share the same frequency band at the same time and perform radio communication with the base station. The signal transmitted from the mobile station becomes an interference signal. Therefore, when data communication is performed, the maximum transmission rate allowed for a certain mobile station is determined by the radio signal or interference signal from another mobile station that is simultaneously communicating using the same line as the mobile station. It is limited by the magnitude of the interference signal due to the interference signal from the source. For this reason, the base station of this example detects the amount of uplink interference power in the uplink communication from the mobile station to the base station. In addition, as described later, by detecting the amount of downlink interference power by the mobile station,
The interference amount may be detected by both the base station and the mobile station.

The above-described uplink interference power amount is based on, for example, the level of a radio signal received from a mobile station (or a plurality of mobile stations if there are a plurality of mobile stations), the level of an interfering signal received from an interference wave source, and the like. This is an amount indicating how much interference power is present in wireless communication from the mobile station to the base station. Generally, as the number of mobile stations accommodated by a base station increases, the amount of interference power tends to increase. In the base station of this example, information on the amount of uplink interference detected at the present time is wirelessly transmitted to the mobile station, for example, at regular intervals by the broadcast signal described above.

In radio communication using the CDMA system, since a signal from another mobile station becomes an interference signal for communication of a certain mobile station as described above,
If the level of the signal received by the base station from each mobile station is not constant, data that cannot be received normally may occur.Therefore, the transmission power from each mobile station is controlled to control reception at the base station. Leveling is performed. For this reason, from the viewpoint of making use of such transmission power control, studies have been made to include the above information on the amount of uplink interference power in the broadcast signal.

In this example, a broadcast signal is formed by the above-mentioned broadcast signal, and the radio unit 2 having the antenna 1 receives information on the amount of uplink interference by a broadcast signal from the base station, thereby making the base station broadcast. Receiving means for receiving information on the amount of uplink interference in the uplink communication to the station by a broadcast signal from the base station is configured.

The transmission rate detection function 4 of this example is a function of detecting an allowable transmission rate based on information on the amount of uplink interference power contained in the broadcast signal received from the base station. This detection process is performed when a broadcast signal wirelessly transmitted from a base station is received by the wireless unit 2 via the antenna 1 and the received signal is processed by the baseband signal processing unit 3.

Specifically, the transmission rate detection function 4 of the present embodiment
Detects an estimated value of the traffic amount according to information on the amount of uplink interference power for each sector, etc., broadcast from the base station,
Based on the traffic amount, the maximum transmission rate currently allowed is detected. FIG. 3 shows an example of a table that stores information (interference amount data) on the amount of uplink interference power notified from the base station and an estimated value (dB) of the traffic amount in association with each other. It is stored in a memory that can be referred to by the transmission rate detection function 4.
The transmission rate detection function 4 of this example detects an estimated value of the traffic amount corresponding to the interference amount data by referring to the table. In this example, “0000” or “000”
The magnitude of the uplink interference power is shown using 4-bit interference amount data such as 1 ″.

Then, the transmission rate detecting function 4 detects the maximum allowable transmission rate based on the detected estimated value of the traffic amount. Here, the correspondence between the estimated value of the traffic amount and the maximum allowable transmission rate is set in the transmission rate detection function 4 in advance, for example. Specifically, the maximum allowed transmission rate decreases as the amount of uplink interference power increases, and the maximum allowed transmission rate increases as the amount of uplink interference power decreases. In general, as the transmission rate decreases, the spreading factor due to spread modulation increases, so that the influence of an interference signal during despreading decreases (ie, the interference becomes stronger) and communication quality improves.

The control section 6 has a function of causing the notification section 5 to output information on the transmission rate detected by the transmission rate detection function 4, for example. In this example, the transmission rate detection function 4 and the control unit 6 determine information on an allowable transmission rate based on the amount of uplink interference power received from the base station, thereby obtaining information on the amount of uplink interference received. Determining means for determining information on the permissible transmission rate is configured.

In this embodiment, the information on the maximum allowable transmission rate is determined as the information on the allowable transmission rate. However, the information on the maximum transmission rate is not always required. A configuration for calculating information on a transmission rate other than the maximum, such as calculating information on all allowable transmission rates may be used.

The information on the permissible transmission rate may be, for example, the value of the transmission rate itself, or may be, for example, information determined based on the transmission rate. The information calculated based on the transmission rate includes, for example, information such as a time required for data communication and a fee. Further, the present invention is not limited to these, and other information may be used as the information on the transmission rate.

In the case of detecting an allowable transmission rate as in this embodiment, it is not always necessary to detect a strict value of the transmission rate. It suffices if the transmission rate is detected. For example, a configuration is possible in which a plurality of transmission rate values are set in advance, and an allowable transmission rate is selectively detected from these.

If, for example, information relating to the amount of uplink interference and time required for data communication (ie, information relating to an allowable transmission rate) are associated in advance, it is not always necessary to detect the transmission rate as in this example. However, it is possible to directly determine the time required for data communication and the like from the information on the amount of uplink interference.

The notification unit 5 is controlled by the control unit 6 and has a function of notifying the user of information on the permissible transmission rate to the user. In the present example, a notification unit configured to notify and output the information determined by the indexing unit to the user by notifying and outputting the information regarding the allowable transmission rate by the notifying unit 5 by such a function.

Here, as a method of outputting the notification by the notification unit 5, for example, a display output of graphics, a display output of characters, a display output by light emission, a voice output, or the like can be used. It is shown below. First, in the configuration for performing graphic display output, the notification unit 5
Is composed of a display device such as an LCD, and changes the graphics displayed and output by the display device in accordance with the transmission rate, thereby informing and outputting information on the transmission rate to the user.

FIG. 4 shows an example of a graphic displayed on the whole or a part of the screen of such a display device. In this example, the scale on the screen is changed according to the transmission rate. It has become so. Specifically, for example, when one scale is displayed, the transmission rate is 32 ksec.
ps, and when the two divisions are displayed, it indicates that the transmission rate is 64 ksps. Such a graphic display may always be performed, for example, by using a part of the screen of the display device, or only when necessary, for example, when the user operates an input device (such as a button) of the mobile station. May be performed.

In the configuration for displaying and outputting characters, the notification unit 5 is constituted by a display device such as an LCD, and changes the characters (messages) displayed and output by the display device according to the transmission rate. Information about the transmission rate is broadcast to the user.

FIG. 5 shows an example of characters displayed on all or part of the screen of the display device. In this example,
The value of the transmission rate is reported and output by text. Specifically, for example, when the maximum allowable transmission rate is 32 ksps, a character message “Currently, data transmission is possible at 32 ksps” is displayed and output. Such a character display may be always performed using, for example, a part of the screen of the display device, or may be performed only when the user needs to operate an input device (such as a button) of the mobile station. May be performed.

In the configuration for performing display output by light emission, the notification unit 5 is composed of, for example, a light emitting element such as an LED. To the user. Specifically, for example, if the transmission rate is 32
In the case of ksps, yellow light emission is generated, and 64k
In the case of sps, it emits orange light. Such light emission can be performed using, for example, a backlight of a display device, or using an LED for notifying an incoming call. Such a light-emitting display may be always performed, for example, or may be performed only when necessary, for example, when a user operates an input device (such as a button) of the mobile station.

In the configuration for outputting sound, the notification unit 5 is composed of a sound output device such as a speaker, and changes the sound (message) output by the sound output device according to the transmission rate. Information about the transmission rate is broadcast to the user. Specifically, for example, when the maximum allowable transmission rate is 32 ksps, the user can operate the input device (such as a button) of the mobile station and the like, and it is said that “data can be transmitted at 32 ksps now”. Output a voice message.

FIG. 6 shows an example of a procedure of processing performed by the mobile station of this embodiment. That is, in the mobile station,
It waits for the reception of a broadcast signal (BCCH) from the base station (step S1), and upon receiving the broadcast signal (step S2), acquires information on the amount of uplink interference included in the signal (step S1).
3). Then, the mobile station converts the information (interference amount data) into an estimated value of the traffic amount with reference to the table shown in FIG. 3 (step S4), and detects the maximum allowable transmission rate (step S4). In step S5), information about the transmission rate is notified to the user by the notification unit 5 (step S6).

As described above, the mobile station of the present example is configured to calculate information on the permissible transmission rate based on information on the amount of uplink interference broadcast from the base station to a plurality of mobile stations, for example. For example, even before a line is connected to a communication partner (for example, another mobile station or the like), information on an allowable transmission rate can be broadcast to the user and thereby the user can be output. Even before the mobile station starts data communication, information on the transmission rate can be known in advance. For this reason, for example, when a line is congested, it is possible to alleviate a large number of users to newly start data communication by the mobile station, which can also help to improve the line congestion.

Next, a second embodiment of the present invention will be described. The configuration of the mobile station of the present embodiment is the same as that of the first embodiment except that the method of detecting the transmission rate by the transmission rate detection function 4 shown in FIG. 1 of the first embodiment is different. It is the same as shown. In this example, for convenience of explanation, the configuration and the like of the transmission rate detection function 4 of this example will be described using the same reference numerals as those of the respective processing units shown in FIG.

The base station of this embodiment performs radio transmission of broadcast information to the mobile station by using a different spreading code (short code in this embodiment) for each transmission rate. Here, the broadcast information is, for example, various information broadcast to the mobile station by the broadcast signal shown in FIG.

FIG. 7 shows an example of the correspondence between the symbol rate (ksps) and the type, period, and number of short codes. As shown in FIG. 7, for example, the chip rate is constant. In this case, different types of short codes are assigned to each transmission rate (symbol rate in this example). The short code is, for example, a short code used to establish synchronization, and data from the base station to the mobile station is communicated using, for example, a long code that is longer than the short code. The number of short codes (the same value as the short code period in this example) is the number of short codes that can be used by the base station.

The transmission rate detecting function 4 of the present embodiment identifies the type of the short code used for spreading the broadcast information received from the base station, and detects the maximum allowable transmission rate based on the type. . In this example, the chip rate is assumed to be constant. Specifically, for example, the transmission rate (symbol rate in this example) used by the base station for communication is determined from the type of the short code, and if the determined transmission rate is high, a relatively high transmission rate is allowed. On the other hand, if the determined transmission rate is low, it is considered that only a relatively low transmission rate is allowed.

In this example, a receiving unit is configured to receive the broadcast information when the radio unit 2 having the antenna 1 receives the broadcast information from the base station. Further, in the present example, the transmission rate detection function 4 and the control unit 6 determine information on the permissible transmission rate based on the type of the short code of the broadcast information received, thereby obtaining the spread code of the received broadcast information. Determining means for determining information on an allowable transmission rate based on the information is constituted. Even with the configuration of the mobile station of the present embodiment described above, for example, the same effects as in the case of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described. The configuration of the mobile station of the present embodiment is the same as that of the first embodiment except that the method of detecting the transmission rate by the transmission rate detection function 4 shown in FIG. 1 of the first embodiment is different. It is the same as shown. In this example, for convenience of explanation, the configuration and the like of the transmission rate detection function 4 of this example will be described using the same reference numerals as those of the respective processing units shown in FIG.

The base station of this example performs radio transmission of broadcast information to the mobile station using a spread code (short code in this example) having a different cycle for each transmission rate. Here, the broadcast information is, for example, various information broadcast to the mobile station by the broadcast signal shown in FIG. As shown in FIG. 7, in this example, for example, the short code cycle differs for each short code type number. Note that the short code cycle referred to in this example is the length of the short code. In this example, the short code period is a symbol period. For example, if the chip rate is the same, the short code period is different for each transmission rate (in this example, the symbol rate).

The transmission rate detecting function 4 of the present embodiment identifies the cycle of the short code used for spreading the broadcast information received from the base station, and detects the maximum allowable transmission rate based on the cycle. . In this example, the chip rate is assumed to be constant. Specifically, for example, the transmission rate (symbol rate) used by the base station for communication is determined from the cycle of the short code, and if the determined transmission rate is high, it is considered that a relatively high transmission rate is allowed. If the determined transmission rate is low, it is considered that only a relatively low transmission rate is allowed.

In this example, a receiving unit is configured to receive the broadcast information when the radio section 2 having the antenna 1 receives the broadcast information from the base station. Further, in this example, the transmission rate detection function 4 and the control unit 6 determine information on the permissible transmission rate based on the cycle of the short code of the broadcast information received, thereby obtaining the spread code of the received broadcast information. Determining means for determining information on an allowable transmission rate based on the cycle is configured. According to the configuration of the mobile station of the present example described above,
For example, effects similar to those of the first embodiment can be obtained.

Next, a fourth embodiment of the present invention will be described. FIG. 8 shows an example of a communication device provided in the mobile station of the present example. The communication device includes an antenna 21, a radio unit 22, a baseband signal processing unit 23, and a notification unit 24.
And a control unit 25. Each of these processing units 2
1 to 25, for example, the transmission rate detection function 4 shown in FIG.
It is almost the same as that shown in the first embodiment except that it is not provided in the first embodiment.

The base station of the present example includes information on the maximum transmission rate allowed for the mobile station in the broadcast signal, and transmits the broadcast signal to the mobile station by radio to notify the mobile station of the information. I do. Here, a signal such as the broadcast signal shown in FIG. 2 is used as the notification signal. Further, the information on the allowable transmission rate may be the value of the transmission rate itself,
Further, other information on the transmission rate may be used.

In this example, the radio unit 2 having the antenna 21
2 receives information on the permissible transmission rate via the broadcast signal from the base station, and by such processing, receives the information on the permissible transmission rate by the broadcast signal from the base station. Means are configured.

Further, in this example, under the control of the control unit 25, the information relating to the received information is output to the user by the notification unit 24, and the information relating to the received information is output by such processing. Notification means for outputting a notification to the user is configured. The information on the received information may be, for example, a value of a transmission rate, or may be, for example, information such as a time required for data communication.

With the configuration of the mobile station of the present embodiment described above, for example, the same effects as those of the first embodiment can be obtained. In the configuration of the present example, for example, the base station determines the transmission rate allowed for the mobile station in consideration of the situation other than the amount of interference power (for example, congestion of data communication with another base station by wire). However, it is also possible to notify the mobile station of information on the transmission rate by a broadcast signal.

Next, a fifth embodiment of the present invention will be described. FIG. 9 shows an example of a communication device provided in the mobile station of this example. The communication device includes an antenna 31, a radio unit 32, a baseband signal processing unit 33, and a notification unit 36.
And a control unit 37. Each of these processing units 3
In the configuration of 1 to 33, 36, and 37, for example, in this example, the baseband signal processing unit 33 includes not only the transmission rate detection function 35 but also the downlink interference amount detection unit 34,
It is almost the same as that shown in the first embodiment except that the method of detecting the transmission rate by the transmission rate detecting function 35 is different.

The downlink interference amount detecting means 34 includes the antenna 31
Has a function of always detecting, for example, the amount of downlink interference power in downlink communication from a base station to a mobile station, based on a radio signal received by the radio unit 32 including Here, in this example, the wireless unit 3 having the antenna 31
Receiving means for receiving a wireless signal by the 2 receiving the wireless signal is configured.

The above-mentioned downlink interference power amount is, for example, the reception level of a radio signal received from a base station, the reception level of a radio signal received from another mobile station, the reception level of an interference signal received from an interference wave source, and the like. Detected based on That is, for example, by regarding these various signals as noise (interference signals) for communication of the mobile station, it is possible to detect a downlink interference power amount indicating how much interference power exists in downlink communication. Can be.

Further, the transmission rate detection function 35 of the present embodiment
The maximum allowable transmission rate is detected based on the amount of downlink interference power detected by the downlink interference amount detection means 34.
As such a detection method, for example, a method similar to the detection method described in the first embodiment, that is, a method of detecting an allowable transmission rate based on the amount of uplink interference power can be used. Specifically, it can be considered that the maximum transmission rate allowed as the amount of downlink interference power increases decreases, while the maximum transmission rate allowed as the amount of downlink interference power decreases increases. it can.

In this example, the transmission rate detection function 3
5 and the control unit 37 determine information on a permissible transmission rate based on the downlink interference power amount detected by the downlink interference amount detection means 34, thereby obtaining information on a permissible transmission rate based on the detected downlink interference amount. An indexing means for indexing is configured. Even with the configuration of the mobile station of the present embodiment described above, for example, the same effects as in the case of the first embodiment can be obtained.

Next, a sixth embodiment of the present invention will be described. FIG. 10 shows an example of a transmission rate determination and notification device provided in the mobile station of this example. This device has three detection functions 41a to 41c for detecting the transmission rate and three weighting units 42a. To 42c and on / off switching 3
Switches 43a to 43c and these switches 43
a switching unit 44 for switching control of a to 43c;
5 and a determination unit 4 for determining the maximum allowable transmission rate
6, a switch 47 for switching between three notification units 49a to 49c to be described later, a notification switching unit 48 for switching and controlling the switch 47, and three notification units 49a to 4 for performing notification output.
9c.

First, a configuration for determining the maximum allowable transmission rate will be described. Each of the detection functions 41a to 41c is a function of detecting a maximum transmission rate allowed in a different manner. For example, there are various detection methods described in the first to fifth embodiments. Specifically, for example, the detection method is based on information on the amount of uplink interference reported from the base station. A method of detecting information based on the type and period of a spreading code of broadcast information from a base station, a method of detecting information related to a transmission rate included in a broadcast signal wirelessly transmitted from a base station, and a method of downlink interference. There is a way to detect based on quantity.

Each of the weighting units 42a to 42c has a function of weighting the detection result by each of the detection functions 41a to 41c based on the probability of detection by each of the detection functions 41a to 41c. This weighting is performed, for example, when two or more detection functions 41a to 41c are selected by switches 43a to 43c described later, and is not performed, for example, when only one detection function 41a to 41c is selected. You may.

Each of the switches 43a to 43c is connected to the detection switching unit 4
4 has a function of switching on / off (that is, selecting) the detection results of the respective detection functions 41 a to 41 c and outputting them to the synthesizer 45. Detection switching unit 44
Switches on and off the switches 43a to 43c,
It has a function of selecting one or a plurality of detection functions 41a to 41c. This switching control is performed, for example, when a user operates an input device (such as a button) of the mobile station.

When a plurality of detection functions 41a to 41c are selected by the switches 43a to 43c, the synthesizer 45 synthesizes the weighted detection results from the selected detection functions 41a to 41c, and synthesizes the results. , While one of the detection functions 43a-4
If only 3c is selected, the selected detection function 4
It has a function of outputting the detection results from 1a to 41c to the determination unit 46.

The determining section 46 has a function of determining the maximum allowable transmission rate based on the detection result input from the synthesizing section 45. As described above, in the mobile station of the present example, for example, one of the plurality of detection functions 41a to 41c is selected to determine the allowable transmission rate, and for example, the two or more detection functions 41a to 41c are determined. By selecting ~ 41c, an allowable transmission rate can be determined by combining these detection results. As an example, by comprehensively determining the detection results using the uplink interference amount and the downlink interference amount,
The certainty of the determination can be improved.

Next, a configuration for notifying and outputting information on the determined transmission rate will be described. The switch 47 is controlled by the notification switching unit 48 and has a function of selecting one of the notification units 49a to 49c for performing notification output. The notification switching unit 48 has a function of switching the switch 47,
This switching control is performed by, for example, an input device (such as a button) of a mobile station.
Is operated by the user.

Each of the notifying units 49a to 49c has a function of notifying and outputting information on a permissible transmission rate in different ways. The way to output this notification is
For example, there are various types shown in the first embodiment, and specifically, for example, those using graphic output, character display output, display output by light emission, sound output, and the like are used.

As described above, in the mobile station of this example, for example, the information on the permissible transmission rate is broadcast to the user by using the broadcast units 49a to 49c selected from the plurality of broadcast units 49a to 49c. Can be output. In this example, the case where the configuration for switching between the plurality of detection functions 41a to 41c and the configuration for switching between the plurality of notification units 49a to 49c are used is shown.
A configuration in which only 41c or only the notification units 49a to 49c are switched may be used. In the present example, the three detection functions 41a to 41c and the three notification units 49a to 49c are configured to be switched. However, the number of switchable detection functions and notification units is not particularly limited as long as the number is plural.

Next, a seventh embodiment of the present invention will be described. Note that the configuration of the mobile station of this example is the same as that of the first embodiment except that the configuration of the transmission rate detection function 4 shown in FIG. 1 of the first embodiment is different. It is. In this example, for convenience of explanation, the configuration and the like of the transmission rate detection function 4 of this example will be described using the same reference numerals as those of the respective processing units shown in FIG.

The transmission rate detection function 4 of the present example has a function of detecting the current transmission rate in wireless communication when wireless communication is being performed by the mobile station. As a method of detecting the transmission rate, for example, in a configuration in which a plurality of transmission rates are selectively switched and used, the currently selected transmission rate is detected as the transmission rate in the current wireless communication. Can be. Further, for example, it is also possible to adopt a configuration in which the transmission rate is detected based on the current progress of data communication.

The control section 37 of this embodiment has a function of causing the notification section 5 to output information on the transmission rate detected by the transmission rate detection function 35. Here, the information on the transmission rate may be, for example, the value of the transmission rate itself, or may be, for example, information such as a time and a fee required for data communication. In this example, the transmission rate detection function 35 and the control unit 37 determine information on the transmission rate in the current wireless communication, thereby forming an indexing unit that determines information on the transmission rate in the current wireless communication.

As described above, in the mobile station of this example, when data communication is performed with a communication partner (for example, another mobile station or the like), information on the current transmission rate in wireless communication is transmitted to the user. , So that the user can know information on the transmission rate in data communication performed by the mobile station.

Here, the type of data wirelessly communicated by the mobile station shown in the above embodiment is not particularly limited, and for example, image data, text data, voice data, and the like can be communicated. The number of transmission rates used for wireless communication is not particularly limited as long as it is plural.

The configuration of the mobile station according to the present invention is not necessarily limited to the configuration described in the above embodiment, and various configurations may be used. As an example, various processes performed by the mobile station according to the present invention may be controlled by a processor executing a control program in a hardware resource including a processor and a memory, for example. May be configured as independent hardware circuits.

When the indexing means according to the present invention is configured using software, for example, since the number of hardware components does not need to be increased, it is stored in a conventionally used mobile station, for example. It is also possible to realize the function of the mobile station according to the present invention simply by making some changes to the software (control program and the like). Also,
The mobile station according to the present invention is preferably used, for example, in a system employing W-CDMA (Wideband-CDMA), but the field of application of the mobile station according to the present invention is not necessarily limited to W-CDMA. The present invention does not
It is applicable to various systems using the method.

[0085]

As described above, according to the mobile station of the present invention, when wirelessly communicating with a base station by a CDMA system using a plurality of transmission rates, information relating to the amount of uplink interference reported from the base station can be obtained. Based on the type and period of the spreading code used for spreading the broadcast information from the base station, information on the permissible transmission rate broadcast from the base station, and the amount of downlink interference detected by itself (mobile station). Information about the permissible transmission rate is broadcast to the user, for example, even before a line is connected to the communication partner, information about the maximum permissible transmission rate and the like is broadcast to the user. can do.

Further, in the mobile station according to the present invention, when wirelessly communicating with the base station by the CDMA system using a plurality of transmission rates, information on the transmission rate in the current wireless communication is determined and broadcast and output. For example, when performing data communication with a communication partner,
Information on the transmission rate in the current wireless communication can be reported and output to the user.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a mobile station according to the present invention.

FIG. 2 is a diagram illustrating an example of a broadcast signal.

FIG. 3 is a diagram illustrating an example of a correspondence between interference amount data and traffic amount;

FIG. 4 is a diagram showing an example of a graphic display.

FIG. 5 is a diagram illustrating an example of character display.

FIG. 6 is a diagram illustrating an example of a procedure of a process performed by a mobile station.

FIG. 7 is a diagram illustrating an example of a correspondence between a symbol rate, a type and a cycle of a short code.

FIG. 8 is a diagram for explaining a configuration example of a mobile station according to the present invention.

FIG. 9 is a diagram illustrating a configuration example of a mobile station according to the present invention.

FIG. 10 is a diagram for explaining a configuration example of a mobile station according to the present invention.

FIG. 11 is a diagram illustrating an example of a wireless communication system.

[Explanation of symbols]

1, 21, 31 ··· antenna, 2, 22, 32 ··· radio section, 3, 23, 33 ··· baseband signal processing section,
4, 35 ... transmission rate detection function, 5, 24, 36
-Notification unit, 6, 25, 37-Control unit, 34-Downlink interference amount detection means, 41a to 41c-Detection function, 42
a to 42c weighting units, 43a to 43c, 47
Switch, 44... Detection switching unit, 45.
46 ··· Determining unit, 48 ··· Information switching unit, 49a-49
c.

Claims (6)

[Claims] 1. A mobile station that wirelessly communicates with a base station by a CDMA method using a plurality of transmission rates, a receiving unit that receives information on the amount of uplink interference in uplink communication to the base station by a broadcast signal from the base station. A mobile station, comprising: indexing means for calculating information on an allowable transmission rate based on the received information; and notifying means for notifying and outputting the determined information to a user. 2. A mobile station that performs wireless communication by a CDMA method using a plurality of transmission rates with a base station that wirelessly transmits broadcast information using a different spreading code for each transmission rate, wherein the mobile station transmits the broadcast information. Receiving means for receiving, an indexing means for calculating information on a permissible transmission rate based on a spread code of the received notification information, and notification means for notifying and outputting the determined information to a user. Mobile station to be characterized. 3. A mobile station that performs wireless communication by a CDMA method using a plurality of transmission rates with a base station that wirelessly transmits broadcast information using a spreading code having a different cycle for each transmission rate, Receiving means for receiving information, indexing means for calculating information on a permissible transmission rate based on a period of a spread code of the received broadcast information, and broadcast means for broadcasting and outputting the determined information to a user. A mobile station, comprising: 4. A mobile station that wirelessly communicates with a base station according to a CDMA system using a plurality of transmission rates, receiving means for receiving information on an allowable transmission rate by a broadcast signal from the base station, and the received information And a notifying unit for notifying and outputting information about the user to the user. 5. A mobile station that wirelessly communicates with a base station by a CDMA method using a plurality of transmission rates, a receiving means for receiving a radio signal, and a downlink interference amount in downlink communication from the base station based on the received signal. A detection means for detecting information on a permissible transmission rate based on the detected downlink interference amount, and a notifying means for notifying and outputting the determined information to a user. A mobile station, characterized in that: 6. A mobile station that wirelessly communicates with a base station by a CDMA system using a plurality of transmission rates, an indexing means for determining information on a transmission rate in a current wireless communication, and broadcasts the determined information to a user. A notifying means for outputting, and a mobile station.