JP2006148709A - Mobile station and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile station and communication system for improving communication stability and security. <P>SOLUTION: The mobile station 200 comprises a transmission power computation unit 206 which calculates a propagation loss between a base station and the mobile station on the basis of reception power of a pilot signal from the base station, switches a transmission power adjustment target between the base station and an extension receiver antenna on the basis of the propagation loss, and determines transmission power to the transmission power adjustment target. Thus, since the transmission power adjustment target is switched between the base station and the extension receiver antenna on the basis of the propagation loss between the base station and the mobile station, even if the mobile station 200 is away from the base station and close to the extension receiver antenna, for example, transmission with great power for compensating the propagation loss with the distant base station is not made, and excessive interference is not given to the extension receiver antenna. Thus, communication stability and security are improved in the mobile station 200 and a communication system including the station. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention particularly relates to a mobile station that communicates with a base station having an extended receiving antenna, and a communication system including the base station and the mobile station.

  There is transmission power control as a method for increasing the frequency utilization efficiency. One of the transmission power control methods is open loop type transmission power control.

  At the start of wireless communication, the mobile station transmits a random access time slot, and the base station receives the time slot and returns a control signal to the mobile station. When transmitting the random access time slot, the open loop transmission power control is used.

For example, in 3GPP, a method for setting transmission power is described in Non-Patent Document 1, and is specifically executed by the following equation.
Preamble_Initial_Power = Primary CPICH TX power−CPICH_RSCP + UL interference + Constant Value

  Here, the Primary CPICH TX power, UL interference, and Constant Value in the above formula are all instructed from the base station to the mobile station, and the CPICH_RSCP transmits the CPICH power transmitted from the base station by the mobile station. You can stop it. The difference between Primary CPICH TX power and CPICH_RSCP included in the above formula means a propagation loss value between the base station and the mobile station.

Thus, the transmission power set by the mobile station is compensated for the propagation loss with the base station.
TS25.331 V5.9.0 p.228

  By the way, there is a movement to introduce a reception-dedicated antenna (hereinafter referred to as “extended reception antenna”) in the base station, and the reception quality is improved by introducing this extended reception antenna.

  However, as shown in FIG. 8, simply by introducing an extended receiving antenna, the transmission position of the base station and the position of the extended receiving antenna are different, so that the conventional transmission loss correction between the base station and the mobile station is corrected. Transmission power control cannot control transmission power well. In particular, when the mobile station is far from the base station and close to the extended receiving antenna, the mobile station transmits with a large amount of power to compensate for the propagation loss with the far base station. There is a problem in that communication is hindered because it causes a large interference. In FIG. 8, A, B, and C are base stations, D is an extended receiving antenna, and M is a mobile station.

  The present invention has been made in view of such a point, and an object thereof is to provide a mobile station and a communication system that improve the stability and safety of communication.

  The mobile station of the present invention includes a separation distance index obtaining unit that obtains an index of a separation distance from the base station, a transmission power adjustment target based on the separation distance index, and the base station and an extended reception antenna of the base station And a transmission power determining means for determining the transmission power for the transmission power adjustment target.

  In the communication system of the present invention, the transmission power adjustment target is set according to the propagation loss between the base station, the extended reception antenna of the base station arranged at a different location from the base station, and the base station. And a mobile station that switches between a base station and the extended reception antenna.

  ADVANTAGE OF THE INVENTION According to this invention, the mobile station and communication system which improve the stability and safety | security of communication can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment, the same components are denoted by the same reference numerals, and the description thereof will be omitted because it is duplicated.

(Embodiment 1)
First, the configuration of the base station according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, a base station 100 includes a multiplexing unit 101, an error correction coding unit 102, a modulation unit 103, an RF transmission unit 104, an antenna 105, an RF reception unit 106, and an extended reception antenna 107. An RF receiving unit 108, a diversity combining unit 109, a demodulation unit 110, an error correction decoding unit 111, and a separation unit 112.

  Multiplexer 101 multiplexes the pilot signal and transmission data and outputs the multiplexed signal to error correction encoder 102. Here, the transmission data includes pilot transmission power information when the base station 100 transmits a pilot signal, extended reception antenna presence / absence information indicating whether the base station 100 has an extended reception antenna, and a base station When 100 has an extended receiving antenna, there are a propagation loss threshold value, information on correspondence between the propagation loss and the transmission power reference value of the mobile station, and the like.

  Note that the “propagation loss threshold” is a target for transmission power adjustment when the mobile station receives the extended reception antenna presence / absence information indicating that the base station 100 has an extended reception antenna, as will be described later. Is used as a reference when switching between the base station and the extended receiving antenna of the base station. Also, “correspondence information between the propagation loss and the transmission power reference value of the mobile station” is information indicating whether the base station 100 has an extended reception antenna in the mobile station, as will be described later. When received, a transmission power reference value that is an element for calculating the transmission power used by the mobile station is obtained from the propagation loss value obtained from the received power of the pilot signal transmitted from the base station 100 and the pilot transmission power information. It is what you use. In addition, the format of the “corresponding relationship information between the propagation loss and the mobile station transmission power reference value” is not particularly limited as long as it can transmit the correspondence between the propagation loss and the mobile station transmission power reference value. For example, a relational expression or a table may be used.

  Error correction coding section 102 performs error correction coding on the output signal from multiplexing section 101 and outputs the result to modulation section 103.

  Modulating section 103 modulates the transmission signal after error correction coding, and outputs the modulated transmission signal to RF transmitting section 104.

  The RF transmission unit 104 performs predetermined radio transmission processing (D / A conversion, up-conversion, etc.) on the transmission signal, and transmits it to the mobile station via the antenna 105.

  The RF receiving unit 106 receives a radio frequency signal via the antenna 105, converts the received signal into a baseband signal, and outputs the signal to the diversity combining unit 109.

  The RF reception unit 108 receives a radio frequency signal via the extended reception antenna 107, converts the received signal into a baseband signal, and outputs the baseband signal to the diversity combining unit 109.

  Diversity combining section 109 receives the output signals from RF receiving section 106 and RF receiving section 108, performs diversity combining, and outputs the received signal after diversity combining to demodulation section 110.

  Demodulation section 110 demodulates the output signal from diversity combining section 109 and outputs the demodulated received signal to error correction decoding section 111.

  Error correction decoding section 111 performs error detection and error correction on the demodulated received signal, and outputs the received signal after error correction to separating section 112.

  Separation section 112 receives the received signal after error correction, extracts the received data from the received signal, and outputs it.

  As shown in FIG. 2, mobile station 200 of Embodiment 1 includes RF receiving section 201, demodulating section 202, error correction decoding section 203, radio quality measuring section 204, demultiplexing section 205, and transmission power calculation. Unit 206, memory 207, multiplexing unit 208, error correction coding unit 209, modulation unit 210, and RF transmission unit 211.

  The RF receiver 201 receives a radio frequency signal via an antenna, converts the received signal into a baseband signal, and outputs the signal to the demodulator 202.

  Demodulation section 202 demodulates the received signal and outputs the demodulated received signal to error correction decoding section 203 and radio quality measurement section 204.

  Error correction decoding section 203 performs error detection / error correction on the demodulated received signal and outputs the error-corrected received signal to demultiplexing section 205.

  Radio quality measuring section 204 receives the demodulated received signal, measures the received power of the pilot signal included in the received signal, and outputs pilot received power information to transmission power calculating section 206. The measurement of the pilot reception power is performed for both the long interval average and the short interval average, and the pilot reception power information includes both the pilot reception power long interval average and the pilot reception power short interval average.

  Separating section 205 separates the received data from the error-corrected received signal and outputs the received data obtained by the separation. In particular, for transmission power calculation section 206, demultiplexing section 205 includes pilot transmission power information when base station 100 transmits a pilot signal, and an extension indicating whether base station 100 has an extended reception antenna. The reception antenna presence / absence information and the propagation loss threshold value and the correspondence information between the propagation loss and the transmission power reference value of the mobile station 200 when the base station 100 has an extended reception antenna are output.

  The transmission power calculation unit 206 receives the output information from the separation unit 205 and the pilot reception power information from the radio quality measurement unit 204, calculates a transmission power value by a “predetermined method”, and calculates the transmission power value as an RF transmission unit. Set to 211. The transmission power calculation unit 206 includes a memory 207 and stores a propagation loss threshold value included in the output information of the separation unit 205 and correspondence information between the propagation loss and the transmission power reference value of the mobile station 200. Details of the operation of the transmission power calculation unit 206 will be described later.

  Multiplexer 208 receives transmission data, multiplexes the input data, and outputs the multiplexed data to error correction encoder 209.

  Error correction coding section 209 performs error correction coding on the transmission signal output from multiplexing section 208 and outputs the transmission signal after error correction coding to modulation section 210.

  Modulation section 210 modulates the transmission signal after error correction coding and outputs it to RF transmission section 211.

  The RF transmission unit 211 performs predetermined wireless transmission processing (D / A conversion, up-conversion, etc.) on the transmission signal, and uses the transmission power adjusted based on the transmission power value set by the transmission power calculation unit 206. A transmission signal is transmitted through an antenna.

  Next, the operation of the transmission power calculation unit 206 will be described.

  The transmission power calculation unit 206 receives pilot reception power information including the pilot reception power long interval average and the pilot reception power short interval average from the radio quality measurement unit 204.

  Transmission power calculation section 206 transmits pilot transmission power information from demultiplexing section 205 when the information on presence or absence of extended reception antennas transmitted from base station 100 and received from demultiplexing section 205 indicates that base station 100 is equipped with an extended receiving antenna. The propagation loss value is calculated by taking the difference between the transmission power value indicated by, and the average pilot reception power length interval from the radio quality measurement unit 204, and compared with the propagation loss threshold value from the separation unit 205.

  As a result of the comparison, if the propagation loss value is larger than the propagation loss threshold, the transmission power calculation unit 206 uses the correspondence information between the propagation loss value and the transmission power reference value of the mobile station 200, A transmission power reference value for the extended reception antenna is calculated.

Then, the transmission power calculation unit 206 calculates an initial transmission power value from the following equation (1) using the obtained transmission power reference value.
Initial transmission power for extended antenna = transmission power reference value for extended antenna + extended antenna interference power + fixed value (1)

  Then, the transmission power calculation unit 206 sets the calculated initial transmission power value for the extended antenna in the RF transmission unit 211.

On the other hand, if the comparison result shows that the propagation loss value is equal to or smaller than the propagation loss threshold value, the transmission power calculation unit 206 performs the pilot transmission power information from the separation unit 205 and the pilot reception power short interval from the radio quality measurement unit 204. Using the average, the initial transmission power value for the base station 100 is calculated by the following equation (2).
Initial transmission power for base station = pilot transmission power-pilot reception power short interval average + base station interference power + fixed value (2)

  Then, the transmission power calculation unit 206 sets the calculated initial transmission power value for the base station in the RF transmission unit 211.

  When the extended reception antenna presence / absence information transmitted from the base station 100 and received from the separation unit 205 indicates that the base station 100 is not equipped with an extended reception antenna, the transmission power calculation unit 206 determines that the propagation loss The behavior is the same as when the value is below the propagation loss threshold.

  In summary, the mobile station 200 compares the propagation loss value with the propagation loss threshold value in the transmission power calculation unit 206 when the base station 100 is equipped with an extended reception antenna. As a result of the comparison, when the propagation loss value exceeds the propagation loss threshold value, that is, when it is estimated that the separation distance between the mobile station 200 and the base station 100 is large, the transmission power calculation unit 206 is directed to the extended reception antenna. The initial transmission power value is calculated and set in the RF transmission unit 211.

  As a result of the comparison, when the propagation loss value is equal to or smaller than the propagation loss threshold, that is, when it is estimated that the separation distance between the mobile station 200 and the base station 100 is small, the transmission power value for the base station 200 is calculated. This is set in the RF transmitter 211.

  In other words, the mobile station 200 obtains a propagation loss value using the pilot signal transmitted from the base station 100, uses the propagation loss value as an “index of separation distance” with the base station 100, Based on the “distance index”, the target for adjusting the transmission power is switched between the base station 100 and the extended reception antenna. This prevents the problem of communication obstruction due to excessive interference given to the extended reception antenna particularly when the mobile station 200 is located far from the base station 100 and close to the extended reception antenna. be able to. Further, since the transmission power adjustment target is switched between the base station 100 and the extended reception antenna based on the propagation loss value, the base station 100 is close to the mobile station 200 but between the mobile station 200 and the base station 100. Even when the propagation loss is large due to faults in the transmission, preventing communication interference due to excessive interference given to the extended receiving antenna when transmitting with large power to compensate for the propagation loss Can do.

  In the above description, the transmission power value for the extended reception antenna is obtained based on the correspondence relationship between the propagation loss value and the transmission power reference value. However, the present invention is not limited to this, and the extended reception antenna is used. The reference transmission power reference value may be a fixed value. By appropriately determining this fixed value, it is possible to prevent the problem of communication inhibition due to excessive interference given to the extended receiving antenna.

  Next, an example of a configuration of a communication system including the base station 100 and the mobile station 200 according to the present embodiment will be described with reference to FIG.

  An ideal configuration of a communication system including the base station 100 and the mobile station 200 is as shown in FIG. 3, specifically, the extended receiving antennas 107 are evenly arranged around the base station 100. It is a configuration. However, when actually implemented, some adjustments are necessary in consideration of various conditions such as topography.

  In such a configuration of the communication system, the separation distance between the mobile station 200 and the extended reception antenna 107 having the shortest separation distance can be determined almost uniquely from the separation distance between the base station 100 and the mobile station 200. As a result, the propagation loss value that can be used as an index of the separation distance between the base station 100 and the mobile station 200 and the mobile station 200 that substantially depends on the separation distance between the mobile station 200 and the extended reception antenna 107 having the shortest separation distance. The correspondence relationship with the transmission power reference value for the extended reception antenna 107 can also be determined substantially uniquely.

  As described above, according to Embodiment 1, the mobile station 200 calculates the propagation loss as an index of the separation distance from the base station 100 based on the received power of the pilot signal transmitted from the base station 100, and the propagation loss is calculated. A transmission power calculation unit 206 is provided that switches the transmission power adjustment target between the base station 100 and the extended reception antenna 107 based on the loss and determines the transmission power for the transmission power adjustment target.

  In this way, the transmission power adjustment target is switched between the base station 100 and the extended reception antenna 107 based on the index of the separation distance from the base station 100. For example, the mobile station 200 is far from the base station 100, and In the case of being close to the extended receiving antenna 107, transmission with large power is not required to compensate for the propagation loss with the distant base station 100, so that excessive interference is prevented from being applied to the extended receiving antenna 107. be able to. Therefore, communication stability and safety can be improved.

  Further, the mobile station 200 is provided with a memory 207 for storing a correspondence relationship between the propagation loss value and the transmission power reference value toward the extended reception antenna, and the transmission power calculation unit 206 sets the object of the transmission power adjustment to the extended reception antenna. 107, the transmission power corresponding to the propagation loss value is determined using the correspondence relationship stored in the memory 207.

  By doing so, the transmission power can be varied according to the propagation loss value, so that the transmission power can be controlled more finely.

  Thus, the communication system including the base station 100 and the mobile station 200 has a separation distance between the base station 100 having the extended reception antenna 107 and the base station 100 based on the received power of the pilot signal transmitted from the base station 100. The transmission power is calculated as an index of the transmission power, the transmission power adjustment target is switched between the base station 100 and the extended reception antenna 107 based on the propagation loss, and the transmission power for the transmission power adjustment target is determined. Mobile station 200 having unit 206.

  By doing so, the mobile station 200 switches the transmission power adjustment target between the base station 100 and the extended reception antenna 107 based on the index of the distance from the base station 100. In the case of being far from the extended reception antenna 107 and being close to the extended reception antenna 107, transmission is not performed with a large amount of power in order to compensate for the propagation loss with the distant base station 100, so that excessive interference is given to the extended reception antenna 107. Thus, a communication system that improves the stability and safety of communication can be constructed.

(Embodiment 2)
The second embodiment is characterized in that, in the first embodiment, the mobile station 200 uses the propagation loss value as an index of the separation distance from the base station to switch the transmission power adjustment target. The position information of the apparatus is acquired, the distance is directly calculated from the position information of the base station, and the object of transmission power adjustment is switched according to the distance.

  As shown in FIG. 4, base station 300 of Embodiment 2 has the same configuration as base station 100. However, the transmission data multiplexed in multiplexing section 101 includes pilot transmission power information when base station 300 transmits a pilot signal, position information of base station 300 (hereinafter referred to as “base station position information”), There are information on presence / absence of the extended reception antenna of the station 300, correspondence distance threshold value and propagation loss when there is an extended reception antenna, and correspondence information between the transmission power reference value of the mobile station and the like.

  Note that the “separation distance threshold value” is a target for transmission power adjustment when the mobile station receives extended reception antenna presence / absence information indicating that the base station 300 has an extended reception antenna, as will be described later. Is used as a reference when switching between the base station and the extended receiving antenna of the base station.

  As illustrated in FIG. 5, the mobile station 400 includes a position information acquisition unit 401, a transmission power calculation unit 402, and a memory 403.

  The location information acquisition unit 401 acquires current location information (hereinafter referred to as “mobile station location information”) where the mobile station 400 is located, and is, for example, a GPS receiver. Then, the location information acquisition unit 401 outputs the acquired mobile station location information to the transmission power calculation unit 402.

  Transmission power calculation section 402 receives data from demultiplexing section 205, specifically, pilot transmission power information when base station 300 transmits a pilot signal, base station position information of base station 300, and base station 300 expands Extended reception antenna presence / absence information indicating whether or not it has a reception antenna, and a separation distance threshold value and propagation loss when the base station 300 has an extended reception antenna, and a transmission power reference value of the mobile station 400 And correspondence information. Also, the transmission power calculation unit 402 receives mobile station location information from the location information acquisition unit 401. The transmission power calculation unit 402 has a memory 403 and stores correspondence information between a separation distance threshold value and a propagation loss included in the output information of the separation unit 205 and the transmission power of the mobile station 400.

  Then, transmission power calculation section 402 calculates the separation distance between mobile station 400 and base station 300 from mobile station position information from position information acquisition section 401 and base station position information from separation section 205. The transmission power calculation unit 402 receives the output information from the separation unit 205 and the pilot reception power information from the radio quality measurement unit 204, calculates a transmission power value by a “predetermined method”, and converts the transmission power value to RF Set in the transmission unit 211. At this time, the transmission power calculation unit 402 compares the calculated separation distance with the separation distance threshold value from the separation unit 205, and sets the target of transmission power adjustment to the base station 300 and the base station 300 based on the comparison result. Switch between the extended receive antennas.

  Specifically, the transmission power calculation unit 402 receives pilot reception power information including a pilot reception power long interval average and a pilot reception power short interval average from the radio quality measurement unit 204.

  The transmission power calculation unit 402 transmits the mobile station from the location information acquisition unit 401 when the extended reception antenna presence / absence information transmitted from the base station 300 and received from the separation unit 205 indicates that the base station 300 includes the extended reception antenna. A separation distance between the mobile station 400 and the base station 300 is calculated from the position information and the base station position information from the separation unit 205, and compared with a separation distance threshold value.

  If the calculated separation distance is larger than the separation distance threshold value as a result of the comparison, the transmission power calculation unit 402 calculates the transmission power value indicated by the pilot transmission power information from the separation unit 205 and the radio quality measurement unit. The propagation loss value is calculated by taking the difference from the average of the pilot received power length interval from 204. Then, using the correspondence information between the propagation loss value and the transmission power reference value of the mobile station 400, the transmission power reference value for the extended reception antenna is calculated.

  Then, the transmission power calculation unit 402 calculates the initial transmission power value from the above equation (1) using the obtained transmission power reference value, and sets the calculated initial transmission power value for the extended antenna in the RF transmission unit 211. .

  On the other hand, if the calculated separation distance is equal to or smaller than the separation distance threshold value as a result of the comparison, the transmission power calculation unit 402 compares the pilot transmission power information from the separation unit 205 and the pilot reception power short from the radio quality measurement unit 204. Using the section average, the initial transmission power value for the base station 300 is calculated by the above equation (2), and the calculated initial transmission power value for the base station is set in the RF transmission unit 211.

  When the extended reception antenna presence / absence information transmitted from the base station 300 and received from the separation unit 205 indicates that the base station 300 is not equipped with an extended reception antenna, the transmission power calculation unit 402 is calculated as a result of the comparison. The movement is the same as when the separation distance is equal to or less than the separation distance threshold.

  In summary, when the base station 300 is equipped with an extended reception antenna, the mobile station 400 compares the calculated separation distance with the separation distance threshold value in the transmission power calculation unit 402. As a result of the comparison, when the separation distance exceeds the separation threshold, the transmission power calculation unit 402 calculates an initial transmission power value for the extended reception antenna and sets this in the RF transmission unit 211.

  Further, as a result of the comparison, when the separation distance is equal to or smaller than the separation distance threshold, a transmission power value for the base station 300 is calculated and set in the RF transmission unit 211.

  In other words, the mobile station 400 calculates a separation distance from the base station 300, uses this as a direct “separation distance indicator” with the base station 300, and based on this “separation distance indicator”, The target for adjusting the transmission power is switched between the base station 300 and the extended reception antenna 107. In this way, particularly when the mobile station 400 is located far from the base station 300 and close to the extended receiving antenna 107, there is a problem of communication inhibition due to excessive interference given to the extended receiving antenna 107. Can be prevented.

  In the above description, the transmission power reference value for the extended reception antenna is obtained based on the correspondence relationship between the propagation loss value and the transmission power reference value. However, the present invention is not limited to this, and the extended reception is performed. The transmission power reference value for the antenna may be a fixed value. By appropriately determining this fixed value, it is possible to prevent the problem of communication inhibition due to excessive interference given to the extended receiving antenna.

  As described above, according to the second embodiment, the mobile station 400 calculates the separation distance from the position information of the base station 300 and the position information of its own apparatus, and sets the target of transmission power adjustment to the base station according to the separation distance. A transmission power calculation unit 402 is provided that switches between 300 and the extended reception antenna 107 of the base station and determines the transmission power for the transmission power adjustment target.

  As a result, the transmission power adjustment target is switched between the base station 300 and the extended reception antenna 107 based on the separation distance from the base station 300. For example, the mobile station 400 is far from the base station 300 and is extended. In the case of being close to the receiving antenna 107, it is not necessary to transmit with a large amount of power in order to compensate for the propagation loss with the distant base station 300, so that it is possible to prevent the extended receiving antenna 107 from being given excessive interference. it can. Therefore, communication stability and safety can be improved.

  Thus, the communication system including the base station 300 and the mobile station 400 calculates a separation distance from the base station 300 having the extended reception antenna 107, the position information of the base station 300, and the position information of its own device, and this separation A mobile station 400 having a transmission power calculation unit 402 that switches the transmission power adjustment target between the base station 300 and the extended reception antenna 107 of the base station 300 according to the distance and determines the transmission power for the transmission power adjustment target. It comprises.

  As a result, the transmission power adjustment target is switched between the base station 300 and the extended reception antenna 107 based on the separation distance from the base station 300. For example, the mobile station 400 is far from the base station 300 and is extended. In the case of being close to the receiving antenna 107, it is not necessary to transmit with a large amount of power in order to compensate for the propagation loss with the distant base station 300, so that it is possible to prevent the extended receiving antenna 107 from being given excessive interference. It is possible to construct a communication system that improves communication stability and safety.

(Embodiment 3)
The feature of the third embodiment is that, in the first embodiment, the mobile station 200 uses the propagation loss value as an index of the separation distance from the base station to switch the transmission power adjustment target. The position information of the device is acquired, and from the position information of the base station and the extended reception antenna of this base station, the separation distance between the mobile station and the base station (hereinafter referred to as “base station separation distance”) and the mobile station and the extended reception antenna The shortest separation distance (hereinafter referred to as “extended reception antenna separation distance”) is calculated, and the transmission power adjustment target is switched according to the comparison result of these separation distances.

  Compared to Embodiment 2, in Embodiment 2, mobile station 400 calculates the separation distance between mobile station 400 and base station 300 from the mobile station position information and the base station position information, and the separation distance threshold value is calculated. Whereas the object of transmission power adjustment is switched according to the result of comparison with (fixed value), in Embodiment 3, the mobile station and the extended receiving antenna are used instead of the separation threshold (fixed value). The extended antenna separation distance, which is the separation distance between and, is used as a comparison reference.

  As shown in FIG. 6, base station 500 of Embodiment 3 has the same configuration as base station 100. However, transmission data multiplexed by multiplexing section 101 includes pilot transmission power information when base station 500 transmits a pilot signal, base station position information of base station 500, and extended reception antenna presence information of base station 500. And the extended reception antenna position information of the base station 500 and the correspondence information between the propagation loss and the transmission power reference value of the mobile station when there is an extended reception antenna.

  Also, as shown in FIG. 7, mobile station 600 of Embodiment 3 has transmission power calculation section 601 and memory 602.

  Transmission power calculation section 601 receives data from demultiplexing section 205, specifically, pilot transmission power information when base station 500 transmits a pilot signal, base station position information of base station 500, and base station 500 expands Extended reception antenna presence / absence information indicating whether or not a reception antenna is provided, and, if the base station 500 has an extended reception antenna, extended reception antenna position information and propagation loss of the extended reception antenna, and the mobile station 600 And the correspondence relationship information with the transmission power reference value. Also, the transmission power calculation unit 601 receives mobile station location information from the location information acquisition unit 401. The transmission power calculation unit 601 includes a memory 602, and base station position information, extended reception antenna position information, and correspondence information between the propagation loss and the transmission power of the mobile station 600 included in the output information of the separation unit 205. Remember.

  Then, transmission power calculation section 601 calculates a base station separation distance between mobile station 600 and base station 500 from mobile station position information from position information acquisition section 401 and base station position information from separation section 205. Also, the transmission power calculation unit 601 uses an extended reception antenna between the mobile station 600 and the extended reception antenna 107 of the base station 500 from the mobile station position information from the position information acquisition unit 401 and the extended reception antenna position information from the separation unit 205. The separation distance is calculated.

  The transmission power calculation unit 601 receives the output information from the separation unit 205 and the pilot reception power information from the radio quality measurement unit 204, calculates the transmission power value by a “predetermined method”, and converts the transmission power value to RF Set in the transmission unit 211. At this time, the transmission power calculation unit 601 compares the calculated base station separation distance and the extended reception antenna separation distance, and sets the target of transmission power adjustment to the base station 500 and the extended reception of the base station 500 based on the comparison result. Switch between antenna 107.

  Specifically, the transmission power calculation unit 601 receives pilot reception power information including a pilot reception power long interval average and a pilot reception power short interval average from the radio quality measurement unit 204.

  The transmission power calculation unit 601 transmits the mobile station from the location information acquisition unit 401 when the extended reception antenna presence / absence information transmitted from the base station 500 and received from the separation unit 205 indicates that the base station 500 includes an extended reception antenna. A base station separation distance is calculated from the position information and the base station position information from the separation unit 205. Further, when the extended reception antenna presence / absence information indicates that the base station 500 is equipped with the extended reception antenna, the transmission power calculation unit 601 and the mobile station position information from the position information acquisition unit 401 and the extended reception from the separation unit 205 An extended receiving antenna separation distance is calculated from the antenna position information. Then, the base station separation distance and the extended reception antenna separation distance are compared.

  As a result of comparison, when the calculated base station separation distance is larger than the extended reception antenna separation distance, the transmission power calculation unit 601 transmits the transmission power value indicated by the pilot transmission power information from the separation unit 205 and the radio quality. The propagation loss value is calculated by taking the difference from the average length of the pilot received power from the measurement unit 204. Then, using the correspondence information between the propagation loss value and the transmission power reference value of mobile station 600, a transmission power reference value for the extended reception antenna is calculated.

  Then, the transmission power calculation unit 601 calculates an initial transmission power value from the above equation (1) using the obtained transmission power reference value, and sets the calculated initial transmission power value for the extended antenna in the RF transmission unit 211. .

  On the other hand, as a result of the comparison, when the calculated base station separation distance is equal to or less than the extended reception antenna separation distance, transmission power calculation section 601 receives pilot transmission power information from separation section 205 and pilot reception from radio quality measurement section 204. The initial transmission power value for base station 500 is calculated by the above formula (2) using the short power average, and the calculated initial transmission power value for base station is set in RF transmitter 211.

  When the extended reception antenna presence / absence information transmitted from the base station 500 and received from the separation unit 205 indicates that the base station 500 is not equipped with an extended reception antenna, the transmission power calculation unit 601 has calculated as a result of the comparison. The movement is the same as when the separation distance is equal to or less than the separation distance threshold.

  In summary, the mobile station 600 calculates the base station separation distance from the base station 500 and the extended reception antenna separation distance from the extended reception antenna 107, and this base station separation distance is directly “separated from the base station 500. Based on the comparison result between the base station separation distance and the extended reception antenna separation distance, the target for adjusting the transmission power is switched between the base station 500 and the extended reception antenna. In this way, particularly when the mobile station 600 is located far from the base station 500 and close to the extended reception antenna 107, there is a problem of communication inhibition due to excessive interference given to the extended reception antenna 107. Can be prevented.

  In the above description, the transmission power value for the extended reception antenna is obtained based on the correspondence relationship between the propagation loss value and the transmission power reference value. However, the present invention is not limited to this, and the extended reception antenna is used. The reference transmission power reference value may be a fixed value. By appropriately determining this fixed value, it is possible to prevent the problem of communication inhibition due to excessive interference given to the extended receiving antenna.

  As described above, according to Embodiment 3, the mobile station 600 calculates the base station separation distance from the position information of the base station 500 and the position information of the own apparatus, and the position information of the extended reception antenna 107 and the position of the own apparatus. The extended reception antenna separation distance is calculated from the information, and the transmission power adjustment is performed between the base station 500 and the extended reception antenna 107 of the base station 500 based on the comparison result of the base station separation distance with respect to the extended reception antenna separation distance. A transmission power calculation unit 601 is provided for switching at.

  In this way, the transmission power adjustment target is switched between the base station 500 and the extended reception antenna 107 based on the comparison result of the base station separation distance with respect to the extended reception antenna separation distance. When it is far from 500 and close to the extended receiving antenna 107, it does not transmit with a large amount of power to compensate for the propagation loss with the distant base station 500. Giving can be prevented. Therefore, communication stability and safety can be improved.

  Thus, the communication system including the base station 500 and the mobile station 600 calculates the base station separation distance from the base station device 500 having the extended reception antenna 107, the position information of the base station 500, and the position information of the own device. At the same time, the extended reception antenna separation distance is calculated from the position information of the extended reception antenna 107 and the position information of its own device, and the target of transmission power adjustment is determined based on the comparison result of the base station separation distance with respect to the extended reception antenna separation distance. And a mobile station 600 having a transmission power calculation unit 601 for switching between the base station 500 and the extended reception antenna 107 of the base station 500.

  In this way, the transmission power adjustment target is switched between the base station 500 and the extended reception antenna 107 based on the comparison result of the base station separation distance with respect to the extended reception antenna separation distance. When it is far from 500 and close to the extended receiving antenna 107, it does not transmit with a large amount of power to compensate for the propagation loss with the distant base station 500. Thus, a communication system that improves the stability and safety of communication can be constructed.

(Other embodiments)
In Embodiment 3, the mobile station 600 selects the extended reception antenna 107 as a target for transmission power adjustment when the base station separation distance is larger as a result of the comparison between the base station separation distance and the extended reception antenna separation distance, The transmission power corresponding to the propagation loss value obtained using the pilot signal is determined using the correspondence between the propagation loss value and the transmission power reference value toward the extended reception antenna. However, the present invention is not limited to this, and a correspondence relationship between the extended reception antenna separation distance and the transmission power reference value is prepared in advance, and the transmission power corresponding to the calculated extended reception antenna separation distance is determined. May be.

  In this case, it is necessary to transmit the correspondence between the extended reception antenna separation distance and the transmission power from the base station to the mobile station.

  Further, in the mobile station, when the transmission power calculation unit indicates that the extended reception antenna presence information received from the separation unit indicates that the base station is equipped with the extended reception antenna, the base station separation distance is compared with the extended reception antenna separation distance. . Then, as a result of the comparison, when the base station separation distance is larger than the extended reception antenna separation distance, the transmission power calculation unit uses the correspondence relationship between the extended reception antenna separation distance and the transmission power reference value to calculate the extended A transmission power reference value for the extended reception antenna according to the reception antenna separation distance is calculated.

  By doing so, the transmission power is not calculated using the propagation loss calculated using the pilot signal transmitted from the base station, but directly for the extended reception antenna according to the extended reception antenna separation distance. Since the transmission power reference value is calculated, it is possible to determine transmission power more suitable for the environment in which the extended reception antenna and the mobile station are placed.

  According to a first aspect of the mobile station of the present invention, there is provided a separation distance index obtaining unit that obtains an index of a separation distance from a base station, and the base station and its base station that are targets of transmission power adjustment based on the separation distance index. The switching means for switching between the extended receiving antennas and the transmission power determining means for determining the transmission power for the transmission power adjustment target are employed.

  According to this configuration, since the transmission power adjustment target is switched between the base station and the extended reception antenna of the base station based on the index of the separation distance from the base station, for example, the mobile station is far from the base station, and In the case of being close to the extended receiving antenna, it is not necessary to transmit with a large amount of power in order to compensate for the propagation loss with a distant base station, so that excessive interference can be prevented from being applied to the extended receiving antenna. . Therefore, communication stability and safety can be improved.

  According to a second aspect of the mobile station of the present invention, the separation distance index obtaining unit calculates a propagation loss value as the separation distance index based on reception power of a pilot channel signal transmitted from the base station, The switching means adopts a configuration in which the transmission power adjustment target is switched between the base station and the extended reception antenna of the base station according to the propagation loss value.

  According to this configuration, the transmission power adjustment target is switched between the base station and the extended reception antenna of the base station based on the propagation loss that is one of the indexes of the separation distance from the base station. If the is far from the base station and close to the extended receiving antenna, it will not transmit with a large amount of power to compensate for the propagation loss with the far base station, and will cause excessive interference to the extended receiving antenna This can be prevented. Therefore, communication stability and safety can be improved.

  According to a third aspect of the mobile station of the present invention, the mobile station includes a storage unit that stores a correspondence relationship between the propagation loss value and a transmission power reference value toward the extended reception antenna, and the transmission power determination unit includes: When the transmission power adjustment target is the extended reception antenna, a configuration is adopted in which the transmission power is determined according to the propagation loss value using the correspondence relationship.

  According to this configuration, the transmission power can be varied according to the propagation loss value, so that the transmission power can be controlled more finely.

  According to a fourth aspect of the mobile station of the present invention, the separation distance index acquisition unit calculates the separation distance from the position information of the base station and the position information of the own device, and the switching unit determines the separation distance. Accordingly, the transmission power adjustment target is switched between the base station and the extended reception antenna of the base station.

  According to this configuration, since the transmission power adjustment target is switched between the base station and the extended reception antenna of the base station based on the separation distance from the base station, for example, the mobile station is far from the base station and extended. In the case of being close to the receiving antenna, transmission is not performed with a large amount of power in order to compensate for a propagation loss with a distant base station, so that it is possible to prevent excessive interference from being given to the extended receiving antenna. Therefore, communication stability and safety can be improved.

  According to a fifth aspect of the mobile station of the present invention, the separation distance index acquisition means calculates the separation distance from the position information of the base station and the position information of the own apparatus, and the position information of the extended reception antenna The extended reception antenna separation distance is calculated from the position information of the own device, and the switching means sets the transmission power adjustment target as the base station and the base station based on the comparison result of the separation distance with respect to the extended reception antenna separation distance. It adopts a configuration for switching between the extended receiving antennas.

  According to this configuration, the transmission power adjustment target is switched between the base station and the extended reception antenna of the base station based on the comparison result of the base station separation distance with respect to the extended reception antenna separation distance. If it is far from the base station and close to the extended receiving antenna, it will not transmit with a large amount of power to compensate for the propagation loss with the far base station. Can be prevented. Therefore, communication stability and safety can be improved.

  According to a first aspect of the communication system of the present invention, transmission power is determined according to a propagation loss between a base station, an extended reception antenna of the base station disposed at a location different from the base station, and the base station. And a mobile station that switches an adjustment target between the base station and the extended reception antenna.

  According to this configuration, since the mobile station switches the transmission power adjustment target between the base station and the extended reception antenna based on the propagation loss between the base station and the mobile station, for example, the mobile station is far from the base station, and Because it does not transmit with large power to compensate for the propagation loss with a distant base station when it is close to the extended receiving antenna, it can prevent giving excessive interference to the extended receiving antenna A communication system that improves the stability and safety of communication can be constructed.

  The mobile station and communication system of the present invention have the effect of improving the stability and safety of communication, and are composed of a mobile station that communicates with a base station having an extended receiving antenna, and the base station and mobile station. It is useful as a communication system.

FIG. 3 is a block diagram showing a configuration of a base station according to the first embodiment. Block diagram showing a configuration of a mobile station according to the first embodiment The figure which shows an example of a structure of the communication system comprised from the base station of FIG. 1, and the mobile station of FIG. Block diagram showing the configuration of a base station according to Embodiment 2 Block diagram showing a configuration of a mobile station according to Embodiment 2 FIG. 9 is a block diagram showing a configuration of a base station according to Embodiment 3 Block diagram showing a configuration of a mobile station according to Embodiment 3 A diagram for explaining a base station having a conventional extended receiving antenna

Explanation of symbols

100, 300, 500 Base station 101, 208 Multiplexer 102, 209 Error correction encoder 103, 210 Modulator 104, 211 RF transmitter 105 Antenna 106, 108, 201 RF receiver 107 Extended receive antenna 109 Diversity combiner 110 , 202 Demodulation unit 111, 203 Error correction decoding unit 112, 205 Separation unit 200, 400, 600 Mobile station 204 Radio quality measurement unit 206, 402, 601 Transmission power calculation unit 207, 403, 602 Memory 401 Position information acquisition unit

Claims (6)

A separation distance index acquisition means for acquiring an index of a separation distance from the base station;
Switching means for switching a target of transmission power adjustment between the base station and an extended reception antenna of the base station based on the separation distance index;
Transmission power determining means for determining transmission power for the transmission power adjustment target;
A mobile station characterized by comprising: The separation distance index acquisition means calculates a propagation loss value as the separation distance index based on the received power of the pilot channel signal transmitted from the base station,
The mobile station according to claim 1, wherein the switching means switches the transmission power adjustment target between the base station and an extended reception antenna of the base station according to the propagation loss value. Storage means for storing a correspondence relationship between the propagation loss value and a transmission power reference value toward the extended reception antenna;
The transmission power determination means determines the transmission power according to the propagation loss value by using the correspondence relationship when the transmission power adjustment target is the extended reception antenna. Mobile stations. The separation distance index acquisition means calculates the separation distance from the position information of the base station and the position information of the own device,
The mobile station according to claim 1, wherein the switching means switches the transmission power adjustment target between the base station and an extended reception antenna of the base station according to the separation distance. The separation distance index acquisition means calculates the separation distance from the position information of the base station and the position information of the own apparatus, and the extended reception antenna separation distance from the position information of the extended reception antenna and the position information of the own apparatus. To calculate
The switching means switches the transmission power adjustment target between the base station and an extended reception antenna of the base station based on a comparison result of the separation distance with respect to the extended reception antenna separation distance. 1. The mobile station according to 1. A base station,
An extended receiving antenna of the base station disposed at a different location from the base station;
A mobile station that switches a target of transmission power adjustment between the base station and the extended receiving antenna according to a propagation loss between the base station, and
A communication system comprising:

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