WO2000014908A1 - Procede de commande de puissance d'un systeme de communication - Google Patents

Procede de commande de puissance d'un systeme de communication Download PDF

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Publication number
WO2000014908A1
WO2000014908A1 PCT/JP1999/003818 JP9903818W WO0014908A1 WO 2000014908 A1 WO2000014908 A1 WO 2000014908A1 JP 9903818 W JP9903818 W JP 9903818W WO 0014908 A1 WO0014908 A1 WO 0014908A1
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WO
WIPO (PCT)
Prior art keywords
wireless
wireless terminal
call request
transmission
transmission power
Prior art date
Application number
PCT/JP1999/003818
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English (en)
Japanese (ja)
Inventor
Kazuhito Ishida
Original Assignee
Hitachi, Ltd.
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 Hitachi, Ltd. filed Critical Hitachi, Ltd.
Publication of WO2000014908A1 publication Critical patent/WO2000014908A1/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
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]

Definitions

  • the present invention relates to a power control method for a CDMA (CODE D IVISION MULTIPLE ACCESS) wireless communication system.
  • a power control method for a CDMA system in which channels having different desired channel qualities coexist.
  • the power control method In the uplink (reverse link), the method of estimating the amount of radio wave attenuation from the received electric field strength of the base station radio wave received by the mobile station and setting the transmission power of the mobile station and the method of transmitting the signal transmitted by the mobile station are described.
  • the base station that receives the signal measures its Eb / No (signal power / noise power density per bit) and adjusts the transmission power of the mobile terminal by a command on the downlink (base station transmission). Used.
  • the mobile station receiving the signal of the base station measures its FER (Frame Error Rate), transmits the value on the uplink, and the base station transmits the transmission power based on the FER value. Is adjusted.
  • FER Fre Error Rate
  • the desired line quality differs between voice communication and data communication.
  • the desired BER Bit Error Rate
  • the target value for data is set to 2.41 ⁇ 23 to 1445, or higher.
  • the line mode can be a circuit-switched mode or a pocket mode. Therefore, Eb / No for data communication is considered to require a high value equal to or higher than that of voice, and if the communication quality of data communication is to be ensured, it will adversely affect the quality of circuits with weak transmission power such as voice communication. Will be given.
  • an object of the present invention is to provide a radio base station and a power control method of a CDMA system that solve the above-mentioned problems of the related art.
  • An object of the present invention is to provide a radio base station and a power control method for the system A.
  • the present invention sets the power setting for new calls based on line quality under conditions that are vulnerable to interference such as voice. That is, for a high-quality line such as data, transmission power is set from a specified value calculated based on ensuring voice line quality. The increase of the transmission power of the high-quality data link is controlled gradually to a value that satisfies the specified transmission rate and quality of the link while monitoring the quality of the voice link.
  • the base station determines in advance the allowable line transmission power according to the line class corresponding to the service condition.
  • the base station monitors the line status of the uplink / downlink CMA channel from time to time, measures the Eb / No and FER (Frame Error Rate) of the existing line, and monitors the calls that may be newly set, such as voice and data.
  • the line conditions of the code channel corresponding to the service conditions are updated as needed.
  • the base station sets the channel conditions of the code channel in advance, and sets a more suitable transmission / reception state with the wireless terminal according to the current traffic density and the waiting packet.
  • the base station When there is a call request for data communication from the wireless terminal, the base station notifies the wireless terminal of the transmission timing, transmission rate, and transmission power.
  • the optimum value and margin at the time of collection of the parameter are obtained from the parameters collected by the channel monitor in the base station in advance. Transmission conditions (transmission power and timing) are determined based on this data. Therefore, since the initial transmission data rate is low in the base station or the radio terminal, the transmission power is set to be considerably lower than the specified transmission conditions, and the data transmission is started.
  • the base station or wireless terminal With the start of transmission by the base station or wireless terminal, the base station or wireless terminal increases transmission power or transmission rate while monitoring Eb / No in code channel units. When the system capacity limit or a preset data channel capacity is reached, the increase in transmission power or transmission speed is stopped. If there is a request to generate a new call in that state, the transmission power / transmission rate of the existing data line may be reduced, or the request to set up a new call may be rejected.
  • FIG. 1 is a diagram showing a communication system of the present invention.
  • FIG. 2 is a diagram showing a wireless base station according to the present invention.
  • FIG. 3 is a diagram showing a wireless terminal of the present invention.
  • FIG. 4 is a diagram showing a table of desired line quality and line state according to the present invention.
  • FIG. 5 is a diagram showing a line state table and an allowable transmission power value table of the present invention.
  • FIG. 6 is a diagram showing a transmission level management table of the present invention.
  • FIG. 7 is a diagram showing a base station power control function block.
  • FIG. 8 is a diagram showing a base station power control function block.
  • FIG. 9 is a diagram showing a wireless terminal power control function block.
  • Figure 10 shows MS originating / sending FIG.
  • FIG. 9 is a diagram showing a flowchart of a BS operation at the time of communication.
  • FIG. 11 is a diagram showing a flowchart of the BS operation at the time of calling / transmitting the ⁇ side.
  • FIG. 12 is a diagram showing a flow chart of the BS operation at the time of calling an MS priority call.
  • FIG. 13 is a diagram showing transmission power distribution below the BS.
  • FIG. 14 is a diagram showing an example of a control channel frame format. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 shows an outline of a communication system to which the present invention is applied.
  • the communication system according to the present invention includes a mobile switching center (MSC) 901 that controls a base station (BS), a BS 902 controlled by the MSC 901, and wireless terminals 903, 904, and 905 that communicate with the BS 902.
  • the service area of BS902 is 910.
  • a description will be given of a case where the wireless terminals 903 and 904 have already communicated with the wireless base station 902 and also the wireless terminal 905 starts communication. It is assumed that voice communication that does not need to be high is performed, and the wireless terminal 905 performs data communication that requires higher line quality than voice communication.
  • FIG. 2 shows a configuration example of the wireless base station 902 of the present invention.
  • Radio base station 902 includes reception section 1301, transmission section 1302, line monitoring section 1310, control section 1320, and storage section 1330.
  • the line monitor unit 1310 has an Eb / ⁇ measurement unit 1311, and a FER measurement unit 1312.
  • control section 1320 includes uplink transmission rate determining section 1321, uplink allowable transmission power value determining section 1322, other channel interference monitoring section 1323, uplink transmission level determining section 1324, control information creating section 1325, downlink transmission rate determining section 1326 And a downlink allowable transmission power value determining unit 1329.
  • the storage unit 1330 stores parameters required for control in a storage format such as a table.
  • the wireless terminal includes a receiving unit 1401, a transmitting unit 1402, an Eb / NO measuring unit 1411, a FER measuring unit 1412, and a control unit 1420.
  • the control unit 1420 includes an uplink channel creation unit 1425 and a power control command extraction unit 1428.
  • FIG. 4 shows a table for storing the desired line quality and the current line state for each wireless terminal.
  • the table shows the MS identification information 1101, and the user-desired line quality 1 1 10 as Eb / N 01 1 1 1 and FER 1 112.
  • the maximum transmit power value that the transmitter can transmit 11 13 and the transmission rate 1 114 Is stored.
  • Eb / N01111, FER111, actual transmission power value 1113, and transmission rate 1114 are stored as actual line conditions. These are further stored for each of the uplink channel and the downlink channel, and thus for each of a plurality of code channels in the uplink channel.
  • FIG. 5 shows a table 1200 showing the current line state in more detail, and a table 1500 of the transmission power allowable value for each line quality class. Further, FIG. 5 also shows how a table 1500 of transmission power allowable values for each line quality class is created from the parameters of the line state table 1200.
  • the line state table includes, as line states for each uplink and downlink, downlink Eb / N01210, downlink FER1211, other information such as interference value 1212, uplink Eb / N01220, uplink FER1221, and other information 1222 such as interference value. Is stored. These may also be stored for each of a plurality of code channels.
  • the transmission power allowable value table 1500 has a line quality class 1501, a transmission power level 1502, a downlink allowable transmission power value 1503, and an uplink allowable transmission power value 1504. It is assumed that one class has multiple levels.
  • FIG. 6 shows a table 1000 of transmission power levels.
  • the table 1000 includes a line quality class 1001, a transmission power level 1002, and a flag section 1003 indicating which level is set as a specified value or an initial value. Is shown.
  • each parameter may be managed in a format (pointer, structure, etc.) other than tables.
  • a format pointer, structure, etc.
  • the wireless base station 902 receives the upstream signal of the wireless terminals 903 and 904 in the receiving unit 1301, performs necessary frequency conversion, demodulation and decoding, and performs line monitoring.
  • the Eb / No measuring unit 131 1 measures Eb / No
  • the FER measuring unit 1312 measures FER.
  • the control unit 1320 creates the table 1120 (or 1200) in association with each measured value and each wireless terminal, and stores the table 1120 (or 1200) in the storage unit 1330.
  • the wireless terminal 905 makes or makes a call so as to start communication.
  • the uplink transmission level determination unit 1324 refers to the table 1000 stored in the storage unit 1330, obtains a specified value 1002 of the transmission level, and obtains the obtained specified value.
  • the permissible transmission power value 1504 for data communication corresponding to 1002 is obtained from the table 1500.
  • the allowable transmission power value 1500 is determined based on the uplink allowable transmission power value determining unit 1322 EEb / No or the like, and is stored in the storage unit 1330 as the table 1500.
  • uplink transmission level determination section 1324 determines a value several levels lower than the allowable transmission power value obtained from table 1500 as an initial value (initial power transmission value), and uses the determined value as control information creation section 1325. Send to Here, the reason why the value is set to be several levels lower is to prevent the wireless terminals 903 and 904, which are already in communication, from performing voice communication, and thus not affect those with low line quality. .
  • the control information creation unit 1352 creates control information including the initial transmission power value. I do.
  • the control information creation unit 1352 usually creates a command to increase or decrease the power by one step. Subsequently, transmitting section 1302 transmits this control information to wireless terminal 905 on the control channel. Note that FIG. 6 shows a state in which the initial value several levels below the specified value is selected, and the transmission power is increased so as to reach the specified value in one step.
  • the control channel is received and demodulated by the receiving unit 1401, and the initial transmission power value is extracted by the power control command extracting unit 1428 of the control unit 1420. Subsequently, transmitting section 1402 starts transmission of the uplink channel with the extracted initial power control value.
  • the power control command extraction unit 1428 normally extracts a command to increase or decrease the power by one step.
  • the uplink channel of the radio terminal 905 is received by the receiving unit 1301, the Eb / No is measured by the Eb / No measuring unit 1311, the FER is measured by the FER measuring unit 1312, and the result is stored in the table 1200 (1120). It is stored as the upstream Eb / Nol 220 (1121) and the upstream FER1221 C1 122).
  • the other channel interference monitoring unit 1323 measures the interference value that the uplink channel transmitted by the wireless terminal 905 gives to the wireless terminals 903 and 904, and compares this interference value with a predetermined threshold.
  • the transmission rate determination unit 1321 determines the transmission rate. It is raised gradually until the user's requirements are met. If any of the interference value, Eb / No, and FER become worse than the threshold value in the process of increasing stepwise, stop the increase, reduce the transmission rate, and adjust the interference value, Eb / No, and FER. Try to meet.
  • the uplink transmission level The decision unit 1324 decides to increase the uplink transmission power value of the MS905 by one level.
  • the uplink transmission power value of the MS determined by the uplink transmission level determination unit 1324 is transmitted to the wireless terminal 905 by the method described above, and the The control unit 1420 of the received wireless terminal 905 increases the transmission power by one level and transmits the uplink channel. In the same way, the power control is performed until the transmission rate required by the user is reached while satisfying the interference value, Eb / No, and FER.
  • the Eb / No measuring unit 141 1 and the FER measuring unit 1412 of the communicating wireless terminals 903 and 904 measure the Eb / No and FER of the downlink channel transmitted by the radio base station 902, and report the measurement result to the uplink CH.
  • the creation unit puts it on the uplink channel, and transmits from transmission unit 1402 to radio base station 905.
  • the wireless base station 902 Upon receiving the report, stores the measurement results 1210 and 121 1 of each wireless terminal as a table 1200 in the storage unit 1330.
  • the allowable downlink transmission power value determining unit 1329 refers to the table 1200 stored in the storage unit 1330 and determines the allowable transmission power value 1503 of the downlink channel for each communication type. Note that the specified value for each communication type is determined using table 1000 as in the case of the uplink.
  • the downlink transmission level determining unit 1328 sets the downlink transmission level of the wireless terminal 905 (in this case, the initial value) to a level that is several levels lower than the allowable transmission power value (specified value) determined by the downlink allowable transmission power value determining unit 1329. Set to.
  • Transmitting section 1302 transmits the downlink channel to wireless terminal 905 at the transmission level determined by the allowable downlink transmission power value determining section. Note that reference numeral 1003 in Fig. 6 indicates that the current level is the specified value or the initial value by setting a flag so that it can be grasped.
  • the radio terminal 905 measures the Eb / No, FER, and interference value for the downlink channel transmitted by the radio base station 902, and reports the measurement result to the radio base station 902 via the uplink channel.
  • the wireless base station 902 Upon receiving the report, stores the measurement result of the wireless terminal 905 in the table 1200 in the storage unit 1330 as the downlink Eb / Nol 210 downlink FER 1211. When transmitting the interference value, it is stored in 1212 or the like.
  • the radio base station 902 estimates an interference value given to the downlink channels of the radio terminals 903 and 904 by the downlink channel transmitted to the radio terminal 905, and compares the interference value with a predetermined threshold value.
  • the transmission rate determination unit 1326 sets the transmission rate It is raised gradually until the required value is satisfied. If any of the interference value, Eb / No, and FER become worse than the threshold value in the process of gradually increasing the value, stop the increase, reduce the transmission speed, and satisfy the interference value, Eb / No, and FER. To do.
  • the downlink transmission level The deciding unit 1328 decides to increase the BS transmission power value by one step.
  • Transmitting section 1302 transmits the downlink channel with the downlink transmission power value determined by downlink transmission level determining section 1328. After that, in the same way, while satisfying the interference value, Eb / No, and FER, the transmission power control of the down channel is performed until the transmission rate required by the user is reached.
  • Fig. 5 shows an example of the configuration of BS902.
  • the BS 902 of the present invention includes a BS reception RF7ANT unit 501, a BS demodulation unit 502, a BS decoding unit 503, a BS audio / de-night processing and layer 2, 3 processing unit 504, and a BS audio / data processing unit. 505, a BS uplink link FER determination section 506, a BS call control section 507, a BS QoS / priority control section 508, a BS voice / data processing section 509, a BS management section 510, and a BS encoding section 511.
  • a BS modulation section 512 a BS transmission RF / ANT section 513, a BS uplink link Eb / No determination section 514, a BS downlink power control section 515, and a BS RF power control section 516.
  • FIG. 8 shows an example of the configuration of the MSC901.
  • MSC901 performs signal exchange connection It comprises a switching unit 521 and a mobility management unit 522 for performing call control and mobile object management.
  • FIG. 9 shows a configuration example of the wireless terminals 903 and 904 of the present invention.
  • the wireless terminal of the present invention includes an MS man-machine interface 601, an MS voice / data processing unit 602, an MS encoding unit 603, an MS modulation unit 604, an MS transmission RF / ANT unit 605, and an MS reception RF. / ANT section 606, MS demodulation section 607, MS decoding section 608, MS downlink Eb / No determination section 609, MS QoS Quality of Service) / priority control section 610, and MS downlink link FER It comprises a judgment unit 611 and an MS management unit 612.
  • a solid line indicates a control signal
  • a broken line indicates a traffic signal (communication information).
  • the BS measures the Eb / No based on the received signal from the MS, inserts a power control bit for the MS into a downlink channel, and controls the transmission power of the MS. Is going.
  • the MS measures the Eb / No based on the received signal from the BS, inserts a power control bit into the uplink channel, and The BS transmits and controls the transmission power for a specific MS based on the Eb / No from the MS.
  • the outgoing call is started by a key input from a man-machine interface (MMI) (601).
  • MMI man-machine interface
  • the signal is subjected to framing in the voice / data processing unit (602).
  • attributes related to line quality and priority control are added from the QoS (Quality of Service) / priority control unit (610).
  • QoS Quality of Service
  • priority control unit 610
  • information relating to the transmittable power value of the MS and the transmission speed to be transmitted which are managed by the management unit (612), are added to the information.
  • the signal output from the voice / data processing unit (602) is subjected to channel coding such as interleave error correction coding.
  • the signal output from the encoding unit (603) is subjected to information modulation and spread modulation of the signal by CDMA in the modulation unit (604).
  • the spread signal is transmitted to the BS via the transmission RF / ANT unit (605) on the uplink.
  • the access method used here is generally a random access method.
  • the signal received by the BS RF / ANT unit (501) is subjected to spread demodulation and information demodulation by the demodulation unit (502).
  • the demodulated received signal that is, the random access signal, is decoded by the decoding unit (503), and then transmitted to the voice / data processing and layer 2 and 3 processing unit (hereinafter, VDLP) (504).
  • VDLP voice / data processing and layer 2 and 3 processing unit
  • the uplink link FER determination unit (506) checks for frame errors, determines the MS service attributes (voice, data, line quality, priority, etc.), authenticates, and checks location information. It is. That is, the received signal is decomposed into frames by the voice / data processing unit (505), and the above-mentioned information is confirmed by the call control unit (507).
  • the MSC includes a switching unit (Switch) (521) and a call control / mobility management unit (Call CTRL and Mobility Management) (522).
  • the switching unit (521) transmits traffic information and the call control / mobility management unit (522). ) Performs processing such as call control, mobility management, and authentication.
  • the data such as the line quality and the priority order are stored in the QoS / priority control unit (508) of the BS, and are controlled in conjunction with the call control.
  • the BS allocates a channel to the MS.
  • this allocation is determined by parameters such as code, frequency, transmission timing, and transmission power and transmission rate, depending on the service request from the MS.
  • the negotiation between the BS and the MS is performed by the management part (612) of the MS, the QoS / priority control part (610), the call control part (507) of the BS, the QoS / priority control part (508), and the management part (508). 510).
  • the BS allocates a line in the following procedure.
  • the BS also monitors signals of other MS channels.
  • the total power value received by the BS is monitored by the RF power control unit (516) as the total received power in the RF / ANT unit (501).
  • Each reception channel is demodulated for each code channel by the demodulation unit (502), and an interference value according to the desired channel quality of the channel is estimated and updated as needed.
  • the QoS / priority control unit (508) uses the parameters determined by the management unit (510) based on the line quality request and the appropriate appropriate Eb / No value. Is set, and an algorithm in case of change is prepared.
  • the message is inserted in the voice / data processing unit (509) via the call control unit (507) and transmitted to the MS.
  • the MS After the line is allocated, the MS starts transmission at the specified timing and transmission rate.
  • the signal received from the MS is monitored as needed by the BS, and the uplink link F ER measurement unit (506) measures the FER to check the quality.
  • the QoS / priority control unit (508) sets priorities according to the desired line quality and assigns appropriate interference conditions to the lines. For those that do not satisfy the desired channel quality, the transmission power of the MS and the power associated with the control information from the BS so that the required value is achieved as long as the interference conditions with other channels at the BS are satisfied. And control the transmission rate. This control is performed by controlling the transmission rate using the control channel shown in Fig. 14, in addition to the closed-loop power control between the MS and BS, which involves changing the reference Eb / No. However, at this time, the management unit (510) and the QoS / priority control unit (508) are controlled so that the interference conditions of other lines, including those with a low line class, do not fall below the specified values (106-125). .
  • the call is initiated by a request from the NW system.
  • the signal is subjected to framing in the voice / data processing unit (509).
  • attributes relating to the line quality and priority control are added from the QoS / priority control unit (508) (In addition, these information is managed by the management unit (510).
  • VDLP voice / data processing and layer 2 and 3 processing unit
  • the signal from the voice / data processing and layer 2 and 3 processing unit (hereinafter referred to as VDLP) (504) is sent to the encoding unit (511), where it is interleaved and error-corrected.
  • Channel information such as encoding is performed.
  • -Information modulation of signal by CDMA Modulates and spread-modulates the output from encoding unit (511) in Z-spreading modulation unit (512). Sent to the MS on the downlink via the / ANT section (513).
  • This section describes how to distribute downlink power.
  • the operation of the RF power control unit (516) is related to the downlink power control unit (515), and power control for each line (code channel) is performed by the downlink power control unit (515). Is performed by the RF power control unit (516). All control information is monitored by the management unit (510). That is, the transmission power of the BS is allocated by a predetermined power distribution value or power ratio shown in FIG. 13, and the transmission power of the entire BS is controlled by the RF power control unit (516). The power control on a per-cell basis is performed by the downstream power control unit (515), and the balance is monitored by the management unit (510).
  • the interference state at each MS is monitored, and the monitored interference state is reflected as a control parameter of the downlink power by the management unit (510). ing.
  • MS can measure downlink FER, and if downlink power can be adjusted by transmitting the measured FER as a power control bit on the uplink, And the line quality by FER in FIG. A confirmation is made.
  • transmission is performed from the BS to the MS based on the power distribution value shown in Fig. 13, and the interference level of the other channel is monitored. Increase or decrease.
  • the reservation channel response frame signal (701) is an MS-ID for identifying an MS, a Message-Type indicating a communication type, a Reservation-Packet-Sequence-Number indicating a reservation bucket order, and an initial transmission power Initial-Tx. -Pw, transmission timing Consists of Tx Timing.
  • the transmission rate control frame signal (702) includes MS-ID, which is information for identifying the MS, Message-Type, which indicates a communication type, and Reservation-Packet-Serquence-Number, which indicates the order of reservation packets. It is composed of QoS / CH_Class indicating the service class and Rate-Control-Command indicating the transmission speed.
  • MS-ID information for identifying the MS
  • Message-Type which indicates a communication type
  • Reservation-Packet-Serquence-Number which indicates the order of reservation packets. It is composed of QoS / CH_Class indicating the service class and Rate-Control-Command indicating the transmission speed.
  • FIG. 10 is a diagram illustrating the operation of a base station (BS) when a wireless terminal (MS) performs a calling and transmitting operation.
  • BS base station
  • MS wireless terminal
  • the BS measures Eb / o (signal power / noise power density per bit) from the total received power and the received power from each MS between one or more MSs that set up the line, This is used as an index of line quality (101). At this time, the transmission speed and line quality are set based on the 9.6 kbps voice line; target FER-0.01. In the case of circuit switching, eight 9.6 kbps lines are required for 64 kbps transmission. Yes, corresponding power is required to satisfy Eb / No.
  • a target transmission power control value is set using Eb / No for each desired channel quality (102).
  • negotiation for line setting is usually performed between the MS and BS (104). In this case, a higher FER is required, so the transmission power needs to be further increased to obtain a higher Eb / No.
  • This negotiation responds to transmission requests (transmission speed, line quality, delay requests, etc.) from the MS, and the BS responds to transmission requests from the line congestion state so that the entire system can operate stably within the capacity. To set appropriate transmission power and transmission timing.
  • FIG. 14 shows a control channel configuration example for negotiation.
  • the MS starts transmission based on the reservation information.
  • the Eb / No of the base station is associated with the channel quality class 2 and is set to the nth level which is lower than the level that completely satisfies the channel quality class 2.
  • level 1 of circuit class 2 high-speed data
  • This line is first controlled by this Eb / No. That is, it is determined whether or not the reception Eb / No satisfies the n-th level of class 2 (107). If not, the process returns to step (104), and the negotiation between the BS and the MS is executed again.
  • a margin is given to the existing line, and a stable system operation is performed while monitoring the line condition. Do.
  • margin refers to a power margin that does not adversely affect other line quality.
  • the BS collects the line status with other MSs as needed by receiving the uplink channel from each MS.
  • step (107) if the condition is satisfied, it is determined whether or not the interference level of another channel satisfies the specified value for the newly generated call (108). If the default value is not satisfied, the process returns to step (104), and the negotiation between the BS and MS is executed again.
  • the BS measures FER of the signal from the MS (109).
  • the FER measured in step (109) does not satisfy the predetermined value, an operation to reduce the transmission speed of the MS and suppress the occurrence of errors is performed (1).
  • the control of the transmission rate to the MS uses, for example, the control channel format shown in FIG.
  • step (109) If the FER measured in step (109) satisfies the specified value, it is checked whether the transmission rate satisfies the user required value (MS required value) (111). If the required values are satisfied, the system enters the steady operation mode (1 12). In this state, the line quality conditions requested by the user are satisfied, and no problems occur with other lines in the system.
  • step (11 1) If the MS does not meet this requirement in step (11 1), the level of Eb / N'o is changed to determine whether the power increase is necessary or not and the MS can do so (113). c If it is determined that the power increase is not required, the MS is instructed to increase the transmission rate (114). To change the transmission rate, the BS calculates the power margin value from the Eb / No and FER of the received signal and converts it to a transmission rate, so that the BS notifies the MS of the allowable value of the transmission rate. For example, change the spreading gain to increase the transmission speed. Since this control is performed under constant power control conditions, quick feedback control to the MS using a dedicated control channel as shown in Fig. 14 is desirable.
  • the line quality may be operated only by power control without controlling the transmission rate. (On the other hand, if it is determined that the power needs to be increased, whether the Eb / No level should be changed to n + 1 (1 15)
  • the most efficient value in the system operation is adopted as the difference between the n-level and the n ⁇ l-level. Thus, the n-level is controlled so as to gradually increase by s.
  • the MS increases the transmission power as a result of the power control loop with the BS.
  • This Eb / No value is determined from the change characteristics of the received Eb / No and the estimated capacity from interference from other channels.
  • Figure 11 shows the BS operation when a call is originated from the network side (Nff) and an incoming call is transmitted to the MS accommodated by the BS.
  • the measurement of the Eb / No of the set line is performed by receiving a signal including the Eb / No measured by the MS and grasping the line state (201).
  • the Eb / No of the line to be set is set for each desired line quality (202).
  • An example of a power setting method at this time will be described later with reference to FIG.
  • the BS calls the MS, negotiates the contents related to the line quality, such as the requested transmission speed and transmission quality from, and the reception timing, and reserves the line (204).
  • the BS starts transmission at the n-th level transmission power according to the reserved timing and conditions (206).
  • the BS monitors not only this new call but also all signals from other lines that have already been set up. That is, the downlink signal quality transmitted by the BS is received by the MS, and the channel quality is transmitted from the MS to the BS as power control and other control information. The BS monitors the result as needed. I have.
  • the BS checks whether the transmission power satisfies the power setting value (202) predetermined for each desired channel quality (208).
  • the negotiation is executed again (204). If the interference level is equal to or less than the specified value, it is checked from the monitoring information from the MS whether the downlink FER satisfies the specified value (209). If the user is not satisfied, an operation for reducing the transmission speed of the downlink is performed (210). If so, it checks whether the transmission rate satisfies the user's requirement (211). If this is satisfied, it enters the normal operation mode (212). In this state, the line quality conditions requested by the user are satisfied, and no problems occur with other lines in the system.
  • the transmission speed of the downlink is increased (214), and the FER is checked. If it is determined that the power needs to be increased, the BS increases the reference power. And start transmission (215).
  • the transmission power level here is n + 1 level.
  • the difference between the n + 1 level and the n level uses the most efficient value in system operation.
  • the value of EbZNo is gradually increased, so that the call request is monitored while monitoring the effect on other lines that are already in communication, especially voice lines with low transmission power. Is controlled so as to provide transmission power step by step to satisfy This value is calculated from the downlink transmission power distribution shown in Fig. 13 and the capacity estimate from the interference of other MS channels.
  • a series of subsequent steps (216-223) of power control, interference measurement, Eb / No measurement, and transmission speed control are the same as those for the transmission power n level. However, if the transmission power or interference to other channels exceeds the specified value at the n + 1 level, the power is reduced to the n level and operation resumes (218).
  • This series of power control is performed until the required transmission rate is satisfied under the required line quality.
  • FIG. 12 shows an example in which a priority call is issued from the MS in the example shown in FIG. 10 and control is performed.
  • the BS monitors the status of the set line and calculates the Eb / No when setting up a new line in advance (301, 302).
  • the BS checks the order of priority calls from the MS (304). Compare the priority of the set line and the line in the setting waiting state, and change the setting of other lines if necessary. Therefore, it is necessary to confirm whether the setting change of other lines is necessary (329), and if necessary, confirm whether or not it is possible (305). If it is not possible, after a certain waiting state (306), check the priority (304). ) Is performed again.
  • the change is made (307), and based on the information, the line is reserved between the MS and BS (308).
  • the power control thereafter is the same as in Fig. 10 (310-328) until it enters the steady operation mode (316).
  • FIG. 13 is an example showing a method for allocating power in a downlink channel.
  • the horizontal axis shows the number of lines (TCHV links) normalized by the voice channel power, and the vertical axis shows the transmission power.
  • the pilot power (401), the overhead channel power (402) for transmitting control signals, the voice channel power (403), and the data channel power are calculated in advance at a fixed ratio. It is operated by dividing.
  • division ratios are determined by the occurrence of traffic and interference characteristics.
  • this ratio especially the power distribution ratio for voice channels and data channels, may be distributed dynamically. In any case, these are preset in order to facilitate interference control.
  • the measurement of the interference power at the BS in Figs. 10, 11, and 12 is performed to set up a stable channel within these distribution ratios.
  • the power control according to the present invention is applied to the subsequent processes, and is executed to perform stable interference control between these channels having different line qualities.
  • the pilot power and the overhead channel power are controlled so as to satisfy a predetermined power ratio with respect to the required transmission power of the voice or data channel.
  • the transmission power setting method is based on a line having a weak interference condition, and stable operation of a data line having a line quality different from that of a voice line becomes possible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

On établit entre une station de base et un terminal radio un ou plusieurs canaux de codage pour lesquels on détermine une qualité de canal exigée de première classe par rapport à un canal basse puissance tel qu'un canal de communication vocale. Dans cet état, on établit un canal supplémentaire de deuxième classe doté d'une valeur d'exigence de qualité de canal supérieure à celle du canal de codage, par exemple un canal de données à grande vitesse. Le terminal radio ou station de base détermine la valeur de puissance de transmission de ce canal de deuxième classe de telle sorte que la valeur soit inférieure à la valeur de puissance de transmission n'influant pas sur la qualité de canal de première classe établie en fonction de la répartition de puissance sur la base du niveau d'interférence de courant. Après l'établissement du canal radio, on augmente graduellement la vitesse de transmission et la puissance de transmission tout en contrôlant les niveaux d'interférence des autres canaux pour leur faire atteindre des valeurs correspondant à la qualité de canal exigée de deuxième classe.
PCT/JP1999/003818 1998-09-08 1999-07-15 Procede de commande de puissance d'un systeme de communication WO2000014908A1 (fr)

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JP10/253517 1998-09-08
JP25351798A JP2000091985A (ja) 1998-09-08 1998-09-08 通信システムの電力制御方法

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US8005042B2 (en) 1997-11-03 2011-08-23 Qualcomm Incorporated Method and apparatus for high rate packet data transmission
KR101306372B1 (ko) 2006-12-19 2013-09-09 재단법인서울대학교산학협력재단 다중 셀 직교 주파수 분할 다중 접속 시스템에서 셀간 간섭 제어를 위한 동적 전력 할당 방법 및 장치
US8811200B2 (en) 2009-09-22 2014-08-19 Qualcomm Incorporated Physical layer metrics to support adaptive station-dependent channel state information feedback rate in multi-user communication systems
US9107109B2 (en) 2000-10-25 2015-08-11 Qualcomm Incorporated Method and apparatus for determining a data rate in a high rate packet data wireless communications system
US9118387B2 (en) 1997-11-03 2015-08-25 Qualcomm Incorporated Pilot reference transmission for a wireless communication system
US9426821B2 (en) 2000-10-25 2016-08-23 Qualcomm Incorporated Method and apparatus for high rate packet data and low delay data transmissions
CN109102816A (zh) * 2018-08-14 2018-12-28 Oppo广东移动通信有限公司 编码控制方法、装置以及电子设备

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US8005042B2 (en) 1997-11-03 2011-08-23 Qualcomm Incorporated Method and apparatus for high rate packet data transmission
US8189540B2 (en) 1997-11-03 2012-05-29 Qualcomm Incorporated Method and apparatus for high rate packet data transmission
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CN100459729C (zh) * 2002-10-03 2009-02-04 株式会社Ntt都科摩 发送功率控制方法，通信设备和无线通信系统
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US8811200B2 (en) 2009-09-22 2014-08-19 Qualcomm Incorporated Physical layer metrics to support adaptive station-dependent channel state information feedback rate in multi-user communication systems
CN109102816A (zh) * 2018-08-14 2018-12-28 Oppo广东移动通信有限公司 编码控制方法、装置以及电子设备

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