WO2001013667A1 - Procede d'acceptation de communications par paquets dans un systeme mobile de telecommunications - Google Patents

Procede d'acceptation de communications par paquets dans un systeme mobile de telecommunications Download PDF

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Publication number
WO2001013667A1
WO2001013667A1 PCT/JP1999/004358 JP9904358W WO0113667A1 WO 2001013667 A1 WO2001013667 A1 WO 2001013667A1 JP 9904358 W JP9904358 W JP 9904358W WO 0113667 A1 WO0113667 A1 WO 0113667A1
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WO
WIPO (PCT)
Prior art keywords
base station
transmission power
call
bucket
transmission
Prior art date
Application number
PCT/JP1999/004358
Other languages
English (en)
Japanese (ja)
Inventor
Kumiko Fujimoto
Takashi Murai
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP1999/004358 priority Critical patent/WO2001013667A1/fr
Publication of WO2001013667A1 publication Critical patent/WO2001013667A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff

Definitions

  • the present invention relates to a packet call accepting method, and more particularly to a bucket call accepting method in a base station communicating with a mobile station in a cell, a CDMA mobile communication system equipped with a base station controller controlling a plurality of base stations, and the like. About.
  • FIG. 18 is an explanatory diagram for explaining the necessity of transmission power control, where 1 is a base station (BS),? ⁇ ? ! is a mobile station (MSi MSn), which performs CDMA communication.
  • the CDMA system is a multiple access method using a spread spectrum communication system. The base station 1 spreads and modulates transmission information of a plurality of channels or users with different codes, and multiplexes each spread modulation signal. Transmit.
  • Each of the mobile stations 2 to 2n despreads the received signal by using the spreading code allocated at the time of communication to demodulate the transmission information addressed to itself, and spread modulates the transmission information to base station 1 Send to
  • signals from the mobile stations 2 i to 2 n arrive at the base station 1 overlapping in time.
  • the signal strength (power) arriving at the base station 1 from each of the mobile stations 2 to 2n differs depending on the distance, transmission path environment, and transmission power. Focusing on a certain mobile station, the signal output from another mobile station becomes an interference wave, and communication becomes impossible if the signal strength from the other mobile station is large.
  • FIG. 19 is a processing flow of the transmission power control by the closed loop method.
  • Step S002 Notify the mobile station MSi (step S002) o
  • the mobile station MSi checks whether the base station BS / SIR notification has been received (step S00 3)
  • the transmission power is determined based on the notified SIR, and a signal is transmitted at the transmission power (step S004).
  • a mobile station (car phone, mobile phone, etc.) moves from a first cell to an adjacent second cell
  • soft handoff control is performed.
  • the soft handoff control is based on the assumption that when a mobile station moves from the first cell to the second cell and enters the cell boundary area, the mobile station in the second cell remains connected to the base station in the first cell.
  • a wireless line is connected to this base station, and then a base station that can communicate with low power is selected for communication.
  • the soft handoff method (1) uninterrupted handoff is possible, and (2) inter-cell diversity is possible.However, one mobile terminal communicates with two base stations at the same time. Uses a lot of radio resources.
  • a packet data service (packet communication) is possible.
  • the transmission rate of a bucket call is higher than the transmission rate of a normal voice call, requiring a large transmission power, and increasing the ratio to the transmission power of the entire base station. That is, when a packet call occurs, the base station raises the transmission power to keep the line quality constant, and requires a large transmission power. For this reason, the radio resources within the cell decrease due to the packet call, causing a problem that the call connection rate decreases.
  • An object of the present invention is to reduce the transmission rate of a voice call during communication or a packet call during communication when the remaining capacity of the radio resources in the cell decreases, or to end the soft hand-off and reduce the transmission power. This is to increase the remaining connection capacity of the radio resources within the recell to improve the call connection rate.
  • Another object of the present invention is to monitor the remaining capacity of radio resources in a cell, and when a packet call cannot be accepted due to the remaining capacity, (1) the transmission rate of a voice call during communication or a packet call during communication; Or (2) to end the soft handoff and suppress the transmission power, thereby enabling bucket calls to be accepted.
  • the base station When the base station receives a request to send a repacket call from the mobile station, the base station predicts (1) the total transmission power from the base station to the mobile station in the cell, and (2) the predicted transmission power is equal to that of the base station. If the transmission power is higher than the transmission power or the threshold, the transmission rate of the voice call communicating with the base station is (3) After that, the connection control of the bucket call is performed.
  • the base station When the base station receives a repacket call transmission request from the mobile station, the base station predicts (1) the total transmission power from the base station to the mobile station in the cell, and (2) the predicted transmission power is If the transmission power is larger than the possible transmission power or the threshold, a terminal in communication with the base station is searched for a terminal in a soft hand-off state. (4) After that, control the connection of the bucket call.
  • the base station When the base station receives a repacket call transmission request from the mobile station, the base station predicts (1) the total transmission power from the base station to the mobile station in the cell, and (2) the predicted transmission power is If the transmission power is larger than the possible transmission power or the threshold value, the transmission rate of the bucket call communicating with the base station is reduced to make the predicted transmission power smaller than the possible transmission power or the threshold value of the base station. (3) Performs connection control for packet calls.
  • the base station side (1) pre-sets and stores the packet call transmission rate corresponding to the mobile station, and (2) receives a packet call transmission request from the mobile station, and The transmission rate of a packet call is determined. (3) The total transmission power from the base station to the mobile station in the cell is predicted in consideration of the transmission rate. If the power is larger than the power or the threshold value, the transmission rate of the voice call during communication with the base station is reduced to make the predicted transmission power smaller than the possible transmission power or the threshold value of the base station. Perform control.
  • the remaining capacity of wireless resources in a cell decreases, (1) reduce the transmission rate of a voice call during communication or a packet call during communication, or (2) end soft hand-off and reduce transmission power. Therefore, the remaining capacity of the radio resources in the cell can be increased, and the call connection rate can be improved.
  • a packet call cannot be accepted due to the remaining capacity of the radio resources in the cell, (1) reduce the transmission rate of a voice call during communication or a bucket call during communication, or (2) end soft handoff to reduce transmission power. Therefore, the remaining capacity of the radio resources in the cell can be increased, and the bucket call can be accepted.
  • Figure 1 illustrates the procedure for accepting packet calls while reducing the transmission rate of voice calls during communication. It is.
  • FIG. 2 is an explanatory diagram of a procedure for setting a threshold value and controlling a transmission rate.
  • FIG. 3 is an explanatory diagram of a procedure for ending the handoff and receiving a bucket call.
  • Figure 4 is an explanatory diagram of the procedure for reducing the transmission rate of a bucket call during communication and accepting the bucket call.
  • FIG. 5 is an explanatory diagram of a procedure for reducing the transmission rate of a voice call during communication and accepting a bucket call at a different transmission rate for each mobile terminal.
  • FIG. 6 is a configuration diagram of a CDMA mobile communication system to which the present invention can be applied.
  • FIG. 7 is a system configuration diagram for explaining the first embodiment of the present invention.
  • FIG. 8 is an explanatory diagram of a control procedure according to the first embodiment.
  • FIG. 9 is an explanatory diagram of the audio transmission rate.
  • FIG. 10 is a system configuration diagram of a modification of the first embodiment.
  • FIG. 11 is an explanatory view of the procedure of the modification.
  • FIG. 12 is a system configuration diagram for explaining a second embodiment of the present invention.
  • FIG. 13 is an explanatory diagram of a control procedure according to the second embodiment.
  • FIG. 14 is a system configuration diagram for explaining a third embodiment of the present invention.
  • FIG. 15 is an explanatory diagram of a control procedure according to the third embodiment.
  • FIG. 16 is a system configuration diagram for explaining a fourth embodiment of the present invention.
  • FIG. 17 is an explanatory diagram of a control procedure according to the fourth embodiment.
  • FIG. 18 is a diagram for explaining the necessity of transmission power control.
  • FIG. 19 is a processing flow of the transmission power control by the closed loop method.
  • FIG. 1 is an explanatory diagram of a procedure for reducing the transmission rate of a voice call during communication and receiving a bucket call.
  • the base station 11 has a function of predicting the transmission power of the lower link, and the base station controller 31 has a traffic monitoring control function.
  • the base station 11 keeps the SIR (Eb / (No + Io) constant in order to maximize the subscriber capacity by optimizing the power allocation for each mobile terminal (mobile station) 21 in the upper wireless link.
  • SIR SIR
  • Eb energy per bit
  • No thermal noise
  • Io interference noise from other users.
  • the base station 11 receives a request for transmitting a bucket call from the mobile terminal 21, (1) the total transmission power on the lower radio line when the call is assumed to be accepted and connected. (2) Notify the base station controller 31 of the occurrence of the packet call and the estimated transmission power.
  • the base station controller 31 checks whether the call is a packet call and the predicted transmission power exceeds a certain radio resource capacity. Click (Step 101). That is, the base station controller 31 determines whether the predicted transmission power is equal to or less than the possible transmission power of the base station.
  • the base station 11 If the predicted transmission power is ⁇ the possible transmission power of the base station, the base station 11 notifies the base station 11 of the acceptance of the bucket call, and the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request.
  • the base station controller 31 notifies the voice codec processing unit to reduce the transmission rate of the active voice call, Reduce the transmission rate (Step 102). Thereafter, the base station 11 notifies the base station 11 of the acceptance of the bucket call. When the base station 11 receives the acceptance, the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request.
  • the transmission rate was controlled based on the estimated transmission power and the magnitude of the base station's possible transmission power. If the estimated transmission power is higher than the threshold, the transmission rate of the voice call communicating with the base station should be reduced to make the expected transmission power smaller than the threshold, and the connection control of the packet call should be performed. Can also.
  • Fig. 2 is an explanatory diagram of the procedure for setting the threshold and controlling the transmission rate. The difference from Fig. 1 is that the threshold is set in advance by the maintenance device (step 103), the estimated transmission power and The point is that transmission rate control is performed based on the magnitude of the threshold (step 101 ′).
  • the remaining capacity of the radio resources in the cell can be increased, and the call connection rate can be improved.
  • the transmission rate of the voice call during communication is reduced and the transmission power is suppressed, so that the remaining capacity of the radio resources in the cell can be increased and the bucket call can be increased. Can be accepted.
  • FIG. 3 is an explanatory diagram of a procedure for forcibly terminating the handoff and accepting a bucket call.
  • the base station 11 has a function of estimating the transmission power of the lower link, and the base station controller 31 has a traffic monitoring control function and a Z handoff control function.
  • the base station 11 controls the transmission power of each mobile terminal 21 so that the SIR is constant in order to maximize the subscriber capacity by optimizing the power allocation for each mobile terminal 21 in the upper wireless link are doing.
  • the base station 11 receives a request for transmitting a rebate call from the mobile terminal 21, the base station 11 predicts the total transmission power in the lower radio line assuming that the call is accepted and connected. Then, the base station controller 31 is notified of the occurrence of the bucket call and the estimated transmission power. When notified of the occurrence of the call and the estimated transmission power of the lower radio link, the base station controller 31 checks that the call is a packet call, and the estimated transmission power exceeds a certain radio resource capacity. Check (step 1 1 1). That is, the base station control device 31 determines whether the predicted transmission power is equal to or less than the possible transmission power of the base station.
  • the base station 11 If the predicted transmission power is ⁇ the possible transmission power of the base station, the base station 11 notifies the base station 11 of the acceptance of the bucket call, and the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request.
  • the base station controller 31 switches the mobile terminal that is communicating with the base station 11 to the soft hand-off terminal. Then, the soft handoff of the obtained mobile terminal is forcibly terminated, communication with the base station 11 is stopped, and the predicted transmission power is made smaller than the possible transmission power of the base station (step 112). Thereafter, the base station controller 31 notifies the base station 11 of the permission to accept the bucket call, and the base station 11 notifies the mobile terminal 21 of the transmission response to the transmission request when the base station 11 receives the reception permission. .
  • the bucket call is accepted according to the normal sequence and the connection with the destination is controlled. I will do it.
  • the transmission rate of the voice call during communication with the base station is reduced and the predicted transmission power is increased. It can be made smaller than the possible transmission power of the station.
  • soft handoff termination control was performed based on the estimated transmission power and the possible transmission power of the base station.However, instead of the possible transmission power, a lower power was set as the threshold, and the expected transmission power and the threshold were set. The soft handoff termination control can be performed based on the size of the soft handoff.
  • the remaining capacity of the radio resources in the cell can be increased, and the call connection rate can be improved.
  • the soft hand-off is terminated and the transmission power is suppressed, so that the remaining capacity of the radio resources in the cell can be increased and packet calls can be accepted.
  • Figure 4 is an explanatory diagram of the procedure for reducing the transmission rate of a bucket call during communication and accepting the bucket call.
  • the base station 11 has a function of predicting the transmission power of the lower link, and the base station controller 31 has a traffic monitoring control function.
  • the base station 11 controls the transmission power of each mobile terminal 21 so that the SIR is constant in order to optimize the power allocation for each mobile terminal 21 in the uplink radio channel and maximize the subscriber capacity. ing.
  • the base station 11 receives a request for transmitting a rebate call from the mobile terminal 21, the base station 11 predicts the total transmission power in the lower radio line assuming that the call is accepted. Then, the base station controller 31 is notified of the occurrence of the bucket call and the predicted transmission power. When notified of the occurrence of the call and the estimated transmission power of the lower radio line, the base station controller 31 checks that the call is a packet call, and the estimated transmission power exceeds a certain radio resource capacity. Check (Step 1 2 1). That is, the base station control device 31 determines whether the predicted transmission power is equal to or less than the possible transmission power of the base station.
  • the base station 11 If the predicted transmission power is ⁇ the transmission power available for the base station, the base station 11 notifies the base station 11 of the permission to accept the bucket call, and if the base station 11 receives the permission, the base station 11 issues a call request. The mobile terminal 21 is notified of the communication response.
  • the base station controller 31 lowers the transmission rate of the packet call during communication (step 122). Thereafter, the base station 11 notifies the base station 11 of the acceptance of the bucket call. When the base station 11 receives the acceptance, the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request. Thereafter, it accepts the packet call according to the normal sequence and controls the connection with the destination.
  • the transmission rate of the bucket call was controlled based on the estimated transmission power and the magnitude of the possible transmission power of the base station.However, instead of the possible transmission power, a power less than that was set as a threshold, and the expected transmission power and It is also possible to control the transmission rate of the bucket call based on the magnitude of the threshold.
  • the remaining capacity of the radio resources in the cell can be increased, and the call connection rate can be improved.
  • the transmission rate of the bucket call during communication is reduced and the transmission power is suppressed, so that the requested bucket call can be accepted.
  • the bucket call can be accepted at a low rate.
  • FIG. 5 is an explanatory diagram of a procedure for reducing the transmission rate of a voice call during communication and accepting a bucket call at a different transmission rate for each mobile terminal.
  • the transmission rate of the bucket call (transmission quality of the bucket call) is set in advance for each mobile terminal, and is stored in the subscriber data storage database 51 provided in the exchange.
  • the base station 11 receives a request for transmitting a rebate call from the mobile terminal 21, the base station 11 obtains the transmission rate of the packet call of the mobile terminal 51.
  • the total transmission power from the base station 11 to the cell ⁇ mobile station is calculated.
  • the base station controller 31 determines whether the call is a packet call and the predicted transmission power is equal to or less than the possible transmission power of the base station. Yes (Step 1 3 1).
  • the base station 11 If the transmission power is higher than the estimated transmission power of the base station, the base station 11 notifies the base station 11 of the acceptance of the bucket call, and the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request.
  • step 13 1 if it is determined in step 13 1 that the predicted transmission power ⁇ the possible transmission power of the base station, the base station controller 31 notifies the voice codec processing unit to reduce the transmission rate of the voice call during communication. Then, lower the transmission rate (step 13 2). Thereafter, the base station 11 notifies the base station 11 of the permission to receive the bucket call, and the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request.
  • bucket call communication can be performed at a transmission rate preset for each mobile terminal, and required transmission quality can be maintained.
  • the transmission rate control of the bucket call was performed based on the estimated transmission power and the magnitude of the possible transmission power of the base station.However, instead of the possible transmission power, a power less than the possible transmission power was set as a threshold, and It is also possible to control the transmission rate of the bucket call based on the magnitude of the power and the threshold.
  • FIG. 6 is a configuration diagram of a CDMA mobile communication system to which the present invention can be applied, where 11 and 12 are base stations, and 21 to 23 are in wireless zones (cells) corresponding to the base stations 11 and 12.
  • Base stations 11 and 12 have the same configuration, AMP section 11a, radio section 11b, baseband processing section 11c, transmission line interface section 11d, call control section 11e, transmission power It has a prediction unit 1 1 f.
  • the AMP section 11a amplifies the transmission / reception signal, and the radio section 11b transmits the high-frequency signal input from the antenna via the re-amplifier section 11a to the baseband signal.
  • the baseband signal is converted to a high-frequency signal and input to the antenna via the amplifier.
  • the baseband processing unit 11c performs processing such as spreading and quadrature modulation on communication signals (call control signals, voice signals, and packet signals), inputs them to the radio unit 1lb, and performs quadrature detection on signals input from the radio unit.
  • the transmission line interface section 11d performs signal multiplexing and Z signal separation processing for N channels and signal conversion processing between base stations and base station controllers.
  • the call control unit 11e When receiving a voice / bucket call origination request from the mobile station, the call control unit 11e notifies the base station control unit 31 of the occurrence of the voice call no-packet call and the predicted transmission power. Whether a call is a voice call or a bucket call is determined by referring to the outgoing call message sent from the mobile station at the time of calling.
  • the transmission power prediction unit 11 f predicts the transmission power of the base station 11 at the time of a transmission request, and inputs the predicted transmission power to the call control unit 11 e.
  • the base station interface units 31a and 3lb perform signal format conversion and level conversion between the base station and the switch, and the clock generation unit 31c generates a reference clock and various timing signals.
  • the controller 31d controls the entire base station controller, the ATM switch / processor 31e performs multiplex conversion, and sends signals from the base stations 11 and 12 to a predetermined port on the switching center side. At the same time, the signal from the exchange is sent to a predetermined base station.
  • the handoff processing unit 31 f performs handoff control, the traffic monitoring control unit 31 g monitors traffic for each base station, and the audio codec processing unit 31 h operates the audio in the wireless section (between the terminal and the base station device).
  • the signal multiplexing processing unit 31 i performs signal multiplexing processing
  • the transmission power control unit 31 j performs transmission power control
  • the maintenance monitoring unit 31 k performs various types of maintenance and monitoring
  • the switch interface unit 3 1 m performs signal conversion processing between the base station controller and the exchange.
  • the traffic monitoring and control unit 31g is provided with a rate control unit 31p for performing transmission rate determination control
  • the voice codec processing unit 31h is a rate change processing unit 31 for changing the transmission rate of voice calls. q is provided.
  • the traffic monitoring control unit 31g determines the allocation status of each channel to the mobile terminal for each base station, whether it is a packet call or voice call, whether it is a handoff state, the transmission rate of each call, etc. It has a traffic monitoring table TRMT (see Fig. 7) for storage.
  • FIG. 7 is a system configuration diagram for explaining the first embodiment of the present invention.
  • the mobile terminals 21 a to 21 c are communicating with the base station 11 based on a voice call, and the mobile terminal 21 d The figure shows the case where a request is made to send a bucket call from.
  • the mobile terminals 21a to 21c communicate with the base station 11 at the transmission rates Ua, Uc, and Ub in the upward direction and at the transmission rates Da, Db, and Dc in the downward direction.
  • FIG. 8 is an explanatory diagram of a control procedure according to the first embodiment.
  • the base station 11 Upon receiving the request for transmitting a bucket call from the mobile terminal 21d, the base station 11 predicts the total transmission power in the lower radio line assuming that the call is accepted and connected. Since the transmission power increases and decreases according to the transmission rate, the lower transmission powers Pa, Pb, and Pc are obtained from the lower transmission rates Da, Db, and Dc. The transmission power P i is obtained. Therefore, the estimated transmission power Ep is
  • Ep ( ⁇ , P i) + P f
  • the base station 11 When the predicted transmission power is obtained, the base station 11 notifies the base station controller 31 of the occurrence of the packet call and the predicted transmission power Ep.
  • the control unit 31d of the base station controller 31 determines whether the generated call is a packet call and whether the estimated transmission power Ep is equal to or less than the possible transmission power E of the base station (step 201). .
  • the control unit 31 d instructs the traffic monitoring control unit 31 g to change the transmission rate of the voice call. .
  • the relay control unit 31p lowers the lower retransmission rate of the voice call during communication, and makes the estimated transmission power Ep smaller than the possible transmission power E of the base station.
  • the rate control unit 31 P can be expressed by the following equation, where f i is the reduction in the transmission power according to the reduction in the lower transmission rate of each voice call.
  • Ep ⁇ i (Pi— £ i) + Pf ⁇ E
  • the reduction of the transmission rate of each voice call is determined (step 202). If the amount of reduction in the transmission rate of each voice call is determined, the traffic monitoring control unit 31g notifies the voice codec processing unit 31h, and the rate change processing unit 31q determines the transmission rate of each voice call. Reduce the transmission rate.
  • FIG. 9 is an explanatory diagram of the audio transmission rate.
  • the rate change processing unit 31q changes the voice transmission rate of the specified channel and transmits voice information to the base station 11 according to an instruction from the traffic monitoring control unit 31g.
  • the base station 11 identifies the number of bits of the audio information received from the base station controller 31 and continuously transmits data at any of 9600 bps, 4800 bps, 2400 bps, and 1200 bps.
  • variable transmission rate control see the CDMA Cellular System, CDMA Cellular System, CDMA Cellular System, Standard Version ARIB STANDARD, ARIB STD-T53 Version 1.0 (1/3 ) ".
  • the control unit 31 d notifies the base station 11 of the permission to accept the bucket call. If the base station 1 1 receives the acceptance permission, it will call The mobile terminal 21d is notified of the outgoing response to the request. Thereafter, it accepts the packet call according to the normal sequence and controls the connection with the destination. As a result, the mobile terminal 21 d starts the communication of the bucket call at the upper retransmission rate Ue and the lower retransmission rate Di.
  • the transmission power of the entire network can be suppressed by lowering the rate of another voice call, and the call connection rate can be improved.
  • the transmission rate is controlled based on the magnitude of the estimated transmission power Ep and the possible transmission power E of the base station.
  • a lower power E T for example, the possible transmission power ⁇
  • the transmission rate of voice calls during communication with the base station is reduced and the estimated transmission power Ep is made smaller than the threshold ⁇ ⁇ .
  • connection control for packet calls can be performed.
  • FIG. 10 is a system configuration diagram of a modified example, and the same parts as in FIG. 7 are denoted by the same reference numerals. Different that point is that from the maintenance units 61 that are set in the base station control apparatus 3 1 by entering the threshold E tau. Also, FIG.
  • FIG. 11 is a diagram illustrating the procedure of the modified example, and the difference from FIG. 8 is that the maintenance device 61 sets the threshold ⁇ ⁇ in advance (step 203), the estimated transmission power Ep and the threshold. The point is that the transmission rate of a voice call is controlled based on the magnitude of E T (step 201 ′).
  • the radio resource capacity in the cell can be controlled by changing the threshold value. Even if a packet call occurs, the transmission power can be reduced by lowering the rate of other voice calls, and the call connection rate can be improved.
  • the base station 11 predicted the transmission power, but the base station controller 31 can predict the transmission power. Further, in the above description, the base station 11 does not have its own traffic management table. However, it is possible to configure so that the base station independently estimates the transmission power.
  • FIG. 12 is a system configuration diagram for explaining a second embodiment of the present invention, in which mobile terminals 21 a to 21 b are communicating with base station 11 based on a voice call, and This shows a case in which the mobile terminal 21d issues a bucket call request while the mobile terminal 21c is communicating with the soft base station 11 and 12 simultaneously with the soft handoff control.
  • FIG. 13 is an explanatory diagram of a control procedure according to the second embodiment.
  • the base station 11 Upon receiving the request for transmitting a bucket call from the mobile terminal 21d, the base station 11 predicts the total transmission power in the lower radio line assuming that the call is accepted and connected. Since the transmission power increases and decreases according to the transmission rate, the transmission power below the lower transmission rate for each mobile terminal is determined, and the transmission power P for the packet call is calculated from the lower transmission rate IM for the packet call. i is found. Therefore, the estimated transmission power Ep is
  • Ep ( ⁇ i P i) + P f
  • the base station 11 When the predicted transmission power is obtained, the base station 11 notifies the base station controller 31 of the occurrence of the bucket call and the predicted transmission power Ep.
  • the control unit 31d of the base station controller 31 determines whether the generated call is a packet call and whether the estimated transmission power Ep is equal to or less than the available transmission power E of the base station (step 301). .
  • the base station 11 If the predicted transmission power Ep ⁇ the possible transmission power E of the base station, the base station 11 notifies the base station 11 of the acceptance of the bucket call, and the base station 11 notifies the mobile terminal 21 d of the transmission response. After that, it accepts the bucket call according to the normal connection sequence and controls the connection with the other party. As a result, the mobile terminal 21 d starts communication of the packet call at the upper retransmission rate Ue and the lower retransmission rate Di. In addition, the traffic monitoring controller 31g updates the traffic table TRMT, notifies the base station 31 of the current transmission power ( ⁇ i P i), and predicts the transmission power when the base station receives the next transmission request. To be able to
  • step 301 if the predicted transmission power Ep ⁇ the possible transmission power E of the base station, the control unit 31d instructs the traffic monitoring control unit 21g to change the transmission rate.
  • the relation control unit 31 P refers to the traffic monitoring table TRMT.
  • the terminal searches for a terminal in the handoff state (mobile terminal 21c in the figure) by referring to the terminal, and instructs the soft handoff processing unit 31f to end the soft handoff control of the terminal.
  • the soft handoff processing unit 31f ends the soft handoff of the mobile terminal 21c in response to the instruction, and stops communication between the mobile terminal 21c and the base station 11.
  • the base station controller 31 and the mobile terminal 21c send and receive (1) a soft handoff end request, (2) a soft handoff end response, and (3) a message response, and the mobile terminal 21c and the base station
  • the communication between the mobile stations 21 and 21 is cut off, and only the communication between the mobile terminal 21c and the base station 12 is left.
  • the estimated transmission power Ep decreases and becomes smaller than the possible transmission power E of the base station 11. If the estimated transmission power Ep does not become smaller than the possible transmission power E of the base station, control such as terminating the soft handoff of another terminal or reducing the transmission rate of the voice call during communication is performed.
  • the control unit 31d notifies the base station 11 of the acceptance of the bucket call.
  • the base station 11 When receiving the acceptance permission, the base station 11 notifies the mobile terminal 2Id of a transmission response to the transmission request. After that, it accepts the packet call according to the normal sequence and controls the connection with the destination. As a result, the mobile terminal 21 d starts the communication of the bucket call at the upper transmission rate Ue and the lower transmission rate Di.
  • the traffic monitoring controller 31g updates the traffic monitoring table TRMT and notifies the current transmission power to the base station 31 so that the base station can predict the transmission power when the next transmission request is accepted. You.
  • the number of calls during re-communication is reduced by terminating the soft handoff, so that the transmission power can be reduced, and a packet call is generated. Even so, the overall transmission power is suppressed and the call connection rate is improved.
  • FIG. 14 is a system configuration diagram for explaining the third embodiment of the present invention, in which mobile terminals 21a to 21c are communicating with base station 11 based on a voice call, and The figure shows a case where a request for transmitting a bucket call is issued from the mobile terminal 21 e while the mobile terminal 21 d communicates with the base station 11 based on the bucket call.
  • the upward transmission rate of mobile terminal 21a to 21c is Ua, Uc, Ud, the downward transmission rate is Da, .Db, Dc, and the upward transmission rate of mobile terminal 21d is Ue, the downlink transmission rate is Df.
  • the upper transmission rate of the packet call for which transmission is requested is Ue, and the lower transmission rate is Df.
  • FIG. 15 is an explanatory diagram of a control procedure according to the third embodiment.
  • the base station 11 Upon receiving the request for transmitting a bucket call from the mobile terminal 21e, the base station 11 predicts the total transmission power in the lower radio line assuming that the call is accepted and connected. Since the transmission power increases or decreases according to the transmission rate, the transmission power under each mobile terminal is determined, and the transmission rate of the packet call is determined by the transmission power P f of the packet call. I get it. Therefore, the estimated transmission power Ep is
  • Ep ( ⁇ i P i) + P f
  • the base station 11 When the predicted transmission power is obtained, the base station 11 notifies the base station controller 31 of the occurrence of the bucket call and the predicted transmission power Ep.
  • the control unit 31d of the base station controller 31 determines whether the generated call is a packet call and whether the estimated transmission power Ep is equal to or less than the possible transmission power E of the base station (step 401). .
  • the base station 11 If the predicted transmission power Ep ⁇ the possible transmission power E of the base station, the base station 11 notifies the base station 11 of the acceptance of the bucket call, and the base station 11 notifies the mobile terminal 21 e of the transmission response. After that, it accepts the bucket call according to the normal connection sequence and controls the connection with the other party. As a result, the mobile terminal 21e starts packet call communication at the upper retransmission rate Ue and the lower retransmission rate Df. In addition, the traffic monitoring control unit 31g updates the traffic table TRMT, notifies the current transmission power ( ⁇ iPi) to the base station 31, and the base station estimates the transmission power when the next transmission request is received. To be able to
  • the estimated transmission power Ep ⁇ the possible transmission power of the base station If the power is E, the control unit 31d instructs the traffic monitoring control unit 31g to change the transmission rate of the packet call.
  • the relation control unit 31p searches for the bucket call terminal (mobile terminal 21d in the figure) with reference to the traffic monitoring table TRMT, and checks the bucket call during communication and the bucket call for which transmission is requested. Reduce the lower transmission rate and make the predicted transmission power Ep smaller than the possible transmission power E of the base station.
  • the reduction in transmission power according to the reduction in the lower transmission rate during a communication call is £ i, and the reduction in transmission power in accordance with the reduction in the transmission rate of the bucket call requested to be transmitted.
  • the traffic monitoring control unit 31g lowers the lower transmission rate of the packet call during communication (Df ⁇ Dg, Df> Dg). For example, the base station controller 31 stores the bucket data sent from the exchange 41 in a buffer, reads out the buffer at a read speed corresponding to a predetermined transmission rate, converts the packet into cells, and sends the cells to the base station. . Thus, the traffic monitoring controller 31g switches the speed at which the bucket data is read from the buffer according to the transmission rate.
  • the control unit 31d notifies the base station 11 of the acceptance of the bucket call.
  • the base station 11 When receiving the acceptance permission, the base station 11 notifies the mobile terminal 21 of a transmission response to the transmission request. Thereafter, it accepts packet calls according to the normal sequence and controls connection with the other party. As a result, the mobile terminal 21e starts packet call communication at the upper transmission rate Ue and the lower transmission rate Dg (Df> Dg).
  • the traffic monitoring control unit 31g updates the traffic table TRMT and notifies the base station 31 of the current transmission power.
  • the transmission data rate of other packets is reduced, and the transmission rate of the packet call during connection is suppressed.
  • the transmission rate (transmission quality) of a packet call is stored in a database in advance in correspondence with the mobile terminal, and when a request for originating a bucket call is received from the mobile terminal, the packet call of the mobile terminal is transmitted.
  • the transmission power of the base station is predicted in consideration of the transmission rate (transmission quality). If the predicted transmission power is larger than the possible transmission power of the base station, the transmission rate of voice calls during communication with the base station is reduced. To control the connection of the bucket call.
  • FIG. 16 is a system configuration diagram for explaining the fourth embodiment of the present invention.
  • the mobile terminals 21a to 21c communicate with the base station 11 based on a voice call while the mobile terminal 2 This shows a case where a bucket call origination request is made from 1d.
  • the mobile terminals 21a to 21c have transmission rates Ua, Uc, and Ub in the upstream direction with the base station 11 and transmission rates in the downward direction.
  • the transmission rate of the bucket call that is, the transmission quality, is set in the database 51 in advance so as to correspond to each mobile terminal.
  • FIG. 17 is an explanatory diagram of a control procedure according to the fourth embodiment.
  • the base station 11 When the base station 11 receives the request for transmitting a bucket call from the mobile terminal 21 d, the base station 11 predicts the total transmission power Ep on the downlink radio line when the call is accepted and connected. That is, the base station 11 obtains the transmission rate Di 'of the packet call of the database 51 mobile terminal 21 d via the base station controller 31 and the exchange 41 and considers the transmission rate. And the total transmit power from base station 11 to cell ⁇ mobile terminal is
  • Ep ( ⁇ i P + P f
  • ( ⁇ i P i) is the current lower transmission power and is known from the base station controller.
  • P f ′ is a transmission power according to the transmission rate D i ′.
  • the base station 11 When the predicted transmission power is obtained, the base station 11 notifies the base station controller 31 of the occurrence of the packet call and the predicted transmission power Ep.
  • the control unit 3 1 d of the base station controller 31 generates It is determined whether the received call is a packet call and whether the predicted transmission power Ep is equal to or less than the possible transmission power E of the base station (step 501).
  • the control unit 31 d instructs the traffic monitoring control unit 31 g to change the transmission rate of the voice call. I do.
  • the relay control unit 31p lowers the lower retransmission rate of the voice call during communication, and makes the predicted transmission power Ep smaller than the possible transmission power E of the base station.
  • the rate control unit 31p calculates the reduction in transmission power according to the reduction in the lower retransmission rate of each voice call as
  • Ep ⁇ i (P i- ⁇ i) + P f 7 ⁇ E
  • the amount of reduction in the transmission rate of each voice call is determined (step 502). If the amount of reduction in the transmission rate of each voice call is determined, the traffic monitoring control unit 31g notifies the voice codec processing unit 31h and the rate change processing unit 31q determines the transmission rate of each voice call. Lower.
  • the control unit 31d notifies the base station 11 of the acceptance of the bucket call.
  • the base station 11 Upon receiving the acceptance permission, the base station 11 notifies the mobile terminal 21 d of a call response.
  • the bucket call is accepted and connection control with the other party is performed.
  • the mobile terminal 21d starts communication of the packet call at the uplink transmission rate Ue and the lower retransmission rate Df '.
  • the transmission rate was controlled based on the estimated transmission power Ep and the possible transmission power E of the base station.However, instead of the possible transmission power, a lower power ⁇ ⁇ was set as the threshold. If the estimated transmission power Ep is greater than the threshold E T , the transmission rate of the voice call during communication with the base station is reduced to reduce the estimated transmission power Ep by the threshold ⁇ ⁇ , and the connection control of the bucket call is performed. It can also be done.
  • the overall transmission power can be suppressed and packet calls can be accepted at different transmission rates (transmission quality) for each mobile device.
  • the transmission power is reduced by lowering the rate of another voice call or by stopping soft handoff.

Abstract

L'invention porte sur un système mobile de communications comportant des stations de base pouvant communiquer avec des postes mobiles dans une cellule, et un contrôleur des stations de base. Chacune des stations de base lorsqu'elle reçoit une demande de communication par paquet estime la puissance totale requise pour les transmissions de la station de base vers les postes mobiles de la cellule. Si l'estimation dépasse la puissance de transmission de la station de base disponible, le contrôleur des stations de base (31) abaisse le débit de transmission de la conversation en cours ou de la communication par paquets, ou interrompt la commande de transfert informatique pour ramener la puissance de transmission sous le niveau disponible, puis connecte la communication par paquets.
PCT/JP1999/004358 1999-08-12 1999-08-12 Procede d'acceptation de communications par paquets dans un systeme mobile de telecommunications WO2001013667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/004358 WO2001013667A1 (fr) 1999-08-12 1999-08-12 Procede d'acceptation de communications par paquets dans un systeme mobile de telecommunications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/004358 WO2001013667A1 (fr) 1999-08-12 1999-08-12 Procede d'acceptation de communications par paquets dans un systeme mobile de telecommunications

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003179968A (ja) * 2001-12-10 2003-06-27 Ntt Docomo Inc 通信制御システム、通信制御方法、基地局及び移動局
US7508778B2 (en) 2001-12-05 2009-03-24 Qualcomm, Incorporated System and method for adjusting quality of service in a communication system
JP2015195598A (ja) * 2009-09-25 2015-11-05 ソニー株式会社 中小規模基地局および通信端末

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH08289367A (ja) * 1995-04-14 1996-11-01 Oki Electric Ind Co Ltd 移動通信システム
JPH1175264A (ja) * 1997-06-27 1999-03-16 Nec Corp 移動通信システム及びその無線回線制御方法

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH08289367A (ja) * 1995-04-14 1996-11-01 Oki Electric Ind Co Ltd 移動通信システム
JPH1175264A (ja) * 1997-06-27 1999-03-16 Nec Corp 移動通信システム及びその無線回線制御方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7508778B2 (en) 2001-12-05 2009-03-24 Qualcomm, Incorporated System and method for adjusting quality of service in a communication system
JP2003179968A (ja) * 2001-12-10 2003-06-27 Ntt Docomo Inc 通信制御システム、通信制御方法、基地局及び移動局
US7308282B2 (en) 2001-12-10 2007-12-11 Ntt Docomo, Inc. Communication control system, communication control method, base station and mobile station
JP2015195598A (ja) * 2009-09-25 2015-11-05 ソニー株式会社 中小規模基地局および通信端末

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