US20080045261A1 - CDMA communication system and its transmission power control method - Google Patents

CDMA communication system and its transmission power control method Download PDF

Info

Publication number
US20080045261A1
US20080045261A1 US11/907,537 US90753707A US2008045261A1 US 20080045261 A1 US20080045261 A1 US 20080045261A1 US 90753707 A US90753707 A US 90753707A US 2008045261 A1 US2008045261 A1 US 2008045261A1
Authority
US
United States
Prior art keywords
transmission power
power control
channel
base station
control signal
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US11/907,537
Inventor
Katsuhiko Tsunehara
Takashi Yano
Nobukazu Doi
Takaki Uta
Keiji Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Communication Technologies 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
Family has litigation
Priority to JP8326493A priority Critical patent/JPH10173594A/en
Priority to JP08-326493 priority
Priority to US08/985,281 priority patent/US6307844B1/en
Priority to US09/818,510 priority patent/US6483816B2/en
Priority to US10/262,935 priority patent/US7006463B2/en
Priority to US11/300,354 priority patent/US20060092886A1/en
Application filed by Hitachi Communication Technologies Ltd filed Critical Hitachi Communication Technologies Ltd
Priority to US11/907,537 priority patent/US20080045261A1/en
Publication of US20080045261A1 publication Critical patent/US20080045261A1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=18188449&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20080045261(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Assigned to HITACHI, LTD. reassignment HITACHI, LTD. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI COMMUNICATION TECHNOLOGIES, LTD.
Application status is Abandoned legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/54Signalisation aspects of the TPC commands, e.g. frame structure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/24TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/245TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/54Signalisation aspects of the TPC commands, e.g. frame structure
    • H04W52/58Format of the TPC bits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/14Separate analysis of uplink or downlink
    • H04W52/146Uplink power control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Abstract

An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station measures the received level of data transmitted from each mobile terminal at each channel, and generates a transmission power control signal of each uplink traffic channel. The generated transmission power control signals are multiplexed, and the multiplexed common transmission power control signal is transmitted to all mobile terminals by using the common channel shared by the mobile terminals. Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the received common transmission power control signal, and controls the transmission power of a data packet.

Description

    BACKGROUND OF THE INVENTION
  • The present invention relates to a code division multiple access mobile communication system and its transmission power control method. More particularly, the present invention relates to a packet communication system and its transmission power control method using reservation based access control.
  • In a CDMA method, a plurality of mobile terminals share the same frequency band to communicate with a single base station. Therefore, for example, if mobile terminals A and B transmit modulated signal waves to the base station, the signal (not desired to be received) transmitted by the mobile terminal B interferes with the signal (desired to be received) transmitted by the mobile terminal A, and the communication of the mobile terminal A with the base station is obstructed. The degree of interference depends on the received level of a signal (not desired to be received) at the base station. If the degree of interference becomes large to some level or more, communication between the mobile terminal and base station becomes impossible.
  • If the transmission power of each mobile terminal can be controlled to always limit the signal level received at the base station to a minimum necessary reception power, it becomes possible to maximize the number of channels capable of being communicated by the base station. The more the transmission power shifts from the minimum necessary reception power, the less the number of channels capable of being communicated by the base station.
  • As transmission power control techniques of CDMA mobile communication, an IS-95 transmission power control method is known and described in TIA/EIA/IS-95 which is a standard system of digital cellular phones adopted in North America. The IS-95 transmission power control method will be described in the following.
  • Since two way communication is essential for cellular phones, a pair of an uplink traffic channel and a downlink traffic channel is used for the communication between the base station and a mobile terminal. The uplink traffic channel is a channel for transmitting data from a mobile terminal to the base station, and a downlink traffic channel is a channel for transmitting data from the base station to the mobile terminal.
  • The base station measures the reception power of data transmitted from each mobile terminal and generates a transmission power control signal in accordance with the measured reception power. If the reception power of data is larger than a target reception power, the base station generates a transmission power control signal “1” for this mobile station. Conversely if the reception power of data is smaller than the target reception power, the base station generates a transmission power control signal “0” for this mobile station. The generated transmission power control signal is inserted into data to be transmitted from the base station to a mobile terminal, and the transmission data with the transmission power control signal is transmitted to the mobile terminal. The mobile terminal controls to reduce the transmission power if the received transmission power control signal is “1”, and to increase it if “0”.
  • This transmission power control will be described specifically with reference to FIG. 12. Each mobile terminal 1 to n and the base station communicate with each other by using a pair of an uplink traffic channel and a downlink traffic channel. The upper row of each pair represents transmission data of the downlink traffic channel, and the lower row represents transmission data of the uplink traffic channel. The width of transmission data, particularly uplink transmission data, is drawn to correspond to a reception power of the uplink data at the base station.
  • When the base station communicates with the mobile terminal 1, it inserts transmission power control signals 132 a, 132 b, 132 c, . . . into a downlink traffic channel 130 a to the mobile terminal 1. The mobile terminal 1 changes its transmission power of the uplink transmission data in accordance with the transmission power control signal obtained from the received channel 130 a. As above, the transmission power control of the mobile terminal 1 is performed by using the downlink traffic channel 130 a. Similar transmission power control is performed also for other mobile terminals 2 to n.
  • SUMMARY OF THE INVENTION
  • With advancement of mobile communication techniques, needs of not only a voice communication function (cellar phone) but also a data communication function are becoming large.
  • For one way communication typical to data communication, CDMA packet communication systems have been proposed from the viewpoint of efficiently using channels. One proposal of such CDMA packet communication systems is described in “Development on CDMA Packet Mobile Communication System” by Yano, Uta, Hasegawa, and Doi, Communication Society Meeting, the Institute of Electronics, Information and Communication Engineers, B-389 (1996).
  • Voice communication is two way communication using uplink and downlink traffic channels, whereas data communication is one way communication using only one of uplink and downlink traffic channels. In such one way communication, a conventional transmission power control method for cellular phones cannot be adopted because this method is established on the assumption that there is one pair of uplink and downlink traffic channels.
  • If a paired downlink channel is provided only for the transmission power control of the uplink traffic channel, one downlink traffic channel is occupied by the transmission power control of only the uplink traffic channel. The use efficiency of traffic channels is lowered.
  • To solve this problem, the invention provides a CDMA packet data communication system in which a base station controls the transmission power of each of a plurality of mobile terminals by using a single downlink traffic channel common for all mobile stations.
  • The base station measures the received level of data transmitted from each mobile terminal at each channel, and generates a transmission power control signal of each channel in accordance with the measured reception level. The generated transmission power control signals are collected together into a format predetermined for the system, and transmitted to all mobile terminals by using the common channel shared by the mobile terminals.
  • Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the collected transmission power control signals transmitted from the base station, and transmits data at the transmission power changed in accordance with the derived transmission power control signal.
  • These and other objects, features and advantages of the present invention will become more apparent in view of the following detailed description of the preferred embodiments in conjunction with accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a diagram showing the structure of a mobile communication network.
  • FIG. 2 is a diagram illustrating a packet data communication system using reservation based access control.
  • FIG. 3 is a diagram showing a first example of the structure of a base station embodying transmission power control of the present invention.
  • FIG. 4 is a diagram showing the structure of an answer packet.
  • FIG. 5 is a diagram showing the structure of a unit for measuring a received level of a traffic channel.
  • FIG. 6 is a diagram showing the structure of a unit for generating a transmission power control signal of a traffic channel.
  • FIG. 7 is a diagram illustrating insertion of a transmission power control signal between answer packets.
  • FIG. 8 is a diagram showing a first example of the structure of a mobile terminal embodying the transmission power control of the invention.
  • FIG. 9 is a diagram illustrating a transmission power control state of an uplink traffic channel realized by the operations of a base station and mobile terminals according to the present invention.
  • FIG. 10 is a diagram showing a second example of the structure of a base station embodying the transmission power control of the invention.
  • FIG. 11 is a diagram showing a second example of the structure of a mobile terminal embodying the transmission power control of the invention.
  • FIG. 12 is a diagram illustrating an uplink traffic channel transmission power control method of a conventional portable telephone system.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 shows the structure of a mobile communication network applied to the present invention. A public switched telephone network (PSTN) 200 is connected with a fixed terminal 201 such as a telephone and a mobile communication network 202. The mobile communication network 202 is connected with a plurality of base stations 203 a, 203 b, . . . Each base station 203 communicates with mobile terminals 204 a, 204 b, . . . in its service area (cell) via radio channels 205.
  • In the following, the invention will be detailed by applying it to a CDMA packet communication system using reservation based access control shown in FIG. 2.
  • In the CDMA packet communication system using reservation based access control, channels shared by a plurality of mobile terminals in the service area include a reservation channel 1 (uplink channel), an answer channel 2 (downlink channel) and a pilot channel 8 (downlink channel). The pilot channel 8 is a channel used for transmitting a pilot signal 9 as a reference signal to each mobile terminal.
  • A mobile terminal having a data transmission request transmits a reservation packet 4 at a desired timing by using the reservation channel 1. The base station is performs scheduling of received reservation packets. The base station selects (schedules) a channel and a time slot (a time slot 7 is defined in an uplink traffic channel 3) via which each mobile terminal can transmit data, from a plurality of uplink traffic channels 3. In order to transmit the scheduling results to each mobile terminal, the base station generates an answer packet 5 corresponding to the reservation packet. The generated answer packet 5 is transmitted to the corresponding mobile terminal in the area by using the answer channel 2. The mobile terminal identifies the answer packet destined to it from received answer packets 5, and transmits a data packet by using the uplink traffic channel and time slot designated by the base station.
  • In the example shown in FIG. 2, the mobile terminal transmitted the reservation packet 4 a receives the answer packet 5 a transmitted to it, selectively from answer packets transmitted from the base station, and transmits a data packet 6 a by using the time slot 7 a of the traffic channel 3 a designated in the received answer packet 5 a.
  • With reference to FIGS. 3 to 9, a first embodiment will be described which realizes a method of controlling the transmission power of an uplink channel.
  • FIG. 3 shows an example of the structure of a base station. A signal received by an antenna 30 is input via a circulator 31 to a reception radio module 32. The reception radio module 32 performs a high/middle frequency reception process to demodulate a signal in a carrier frequency band into a baseband signal. Since the received signal has a plurality of multiplexed channel signals, it is input to an acquisition/despread circuit (33, 42 a-42 n) to be spectrum despread.
  • A reservation channel output from the reservation channel acquisition/despread circuit 33 is supplied via a signal line 50 to a detector 35 whereat it is detected and then supplied to a decoder 36 whereat an error correction decode process such as Viterbi decoding is performed. A packet interpretation unit 37 interprets the decoded reservation packet to obtain a terminal ID of the mobile terminal which transmitted the reservation packet and the reservation contents such as transmission data, and transfers the reservation contents to an answer packet generator unit 38.
  • The reservation packet is also input via a signal line 51 to a unit 39 for measuring the received level of the reservation channel. This unit 39 measures a signal to noise power ratio (SN ratio) of the reservation packet. The measurement result of the received level is compared with a reference reception level by an initial transmission power control signal generator 40. In accordance with this comparison result, a transmission power control signal is generated which designates a transmission power when the mobile terminal starts transmitting a data packet. The generated transmission power control signal is input to an answer packet generator 38.
  • In accordance with the reservation contents interpreted by the packet interpretation unit 37 and the transmission power control signal generated by the initial transmission power control signal generator 40, the answer packet generator 38 generates an answer packet. An example of the structure of an answer packet is shown in FIG. 4. A mobile terminal ID is an ID of a mobile terminal which transmitted a reservation packet. This ID is used as a destination of the answer packet. An allocated channel 101 and an allocated slot number 102 indicate an uplink traffic channel and a time slot to be used by the mobile terminal and are designated by the answer packet generator 38. An initial transmission power 103 indicates a transmission power when the mobile terminal starts transmitting data and is designated by the transmission power control signal input from the initial transmission power control signal generator 40. This initial transmission power control signal may designate an increase/decrease relative to the transmission power when the reservation packet was transmitted, or may be an absolute value (increased/decreased value) of the transmission power, whichever of them is determined by the system. A CRC (Cyclic Redundancy Check) 104 is a code added to the answer packet for error detection/correction.
  • The answer packet generated in the above manner is input to a coder 47 whereat an error correction coding such as convolutional coding is performed. The coded answer packet is input to a unit 41 for inserting a traffic channel transmission power control signal.
  • The other acquisition/despread circuits 42 a to 42 n provided for a plurality of uplink traffic channels each output a data packet transmitted via each uplink traffic channel. The data packet of each channel is supplied via a signal line 52 to a detector 43 a-43 n and a decoder 44 a to 44 n to be detected and decoded, and the reception data is output from a signal line 54.
  • The data packet is also supplied via a signal line 53 to a unit 45 for measuring the received level of the traffic channel. The structure of this unit 45 is shown in FIG. 5. The received level measurement units 45 a to 45 n corresponding to the uplink traffic channels 53 a to 53 n measure the received level such as an SN ratio.
  • The received level measurement result of each traffic channel is input to a traffic channel transmission power control signal generator 46. The structure of the generator 46 is shown in FIG. 6. Each of the transmission power control signal generators 46 a to 46 n provided for each uplink traffic channel compares the received level with a target reception level, and generates a transmission power control signal for making the mobile terminal renew the transmission power when it continues data transmission. Similar to the initial transmission power control signal, this renewal designation transmission power control signal is determined by the system. The generated transmission power control signal is input to the unit 41 for inserting the traffic channel transmission power control signal.
  • As shown in FIG. 7, the traffic channel transmission power control signal insert unit 41 inserts a common transmission power control signal 111 generated by the traffic channel transmission power control signal generator 46 at a predetermined interval between answer packets 110 input from the answer packet generator 38. The common transmission power control signal 111 is constituted of transmission power control signals 111 a to 111 n of respective traffic channels 1 to n.
  • In order to suppress a fluctuation of the received level of a data packet, the base station is required to perform a transmission power control of each mobile terminal at a sufficiently high occurrence frequency. The data packet is made of several tens of bits to allow information of some amount to be transmitted at the same time. In contrast, the common transmission power control signal 111 can be made of n bits assuming the same system as IS-95. As shown in FIG. 4, the answer packet can be made sufficiently small relative to the size of a data packet. Therefore, as in this embodiment, even if the answer channel and the transmission power control channel are shared, the transmission power control can be performed at a sufficiently high occurrence frequency. If the answer packet and the common transmission power control signal are received by the same channel, the mobile terminal can use a common receiver both for the answer packet and common transmission power control signal. In this manner, the circuit scale of each mobile terminal can be made small.
  • It is also possible to transmit the common transmission power control signal at a transmission power larger than that of the answer packet in order to reliably perform the transmission power control.
  • The answer packet and common transmission power control signal are spectrum spread by a spreader 48 for answer channel. The spectrum spread answer packet and common transmission power control signal are multiplexed with other downlinks by an adder 58, modulated from the baseband signal into a signal in the carrier frequency band by a transmission radio module 49, and transmitted from the antenna 30 via the circulator 31.
  • An example of the structure of a mobile terminal is shown in FIG. 8.
  • The operation of transmitting a reservation packet from a mobile terminal will be described.
  • A signal received by an antenna 30 is input via a circulator 61 to a reception radio module 62. The reception radio module 62 performs a high/middle frequency reception process to demodulate a signal in the carrier frequency band into a baseband signal. A pilot signal output from an acquisition/spread circuit 150 for a pilot channel is input to a unit 151 for measuring a received level. This unit 152 measures the received level (e.g., SN ratio) of the pilot signal. The measurement result of the received level is input to a reservation channel gain calculator 152 which determines the transmission power of a reservation packet in accordance with the received level of the pilot signal.
  • In the mobile communication system provided with independent pilot channels, the pilot signal is transmitted from the base station always at a constant transmission power level. Therefore, if an SN ratio of the received pilot signal is large, it is conceivable that the mobile terminal is near at the base station so that the reservation channel gain calculator 152 calculates a small gain. Conversely, if an SN ratio of the received pilot signal is small, it is conceivable that the mobile terminal is far from the base station so that the reservation channel gain calculator 152 calculates a large gain. In order to determine the transmission power of a reservation packet in the above manner, another signal different from the pilot signal may be used so long as it allows the mobile terminal to know the transmission power of the base station. For example, the pilot signal whose transmission power is determined by the system or a control signal transmitted with the transmission power value can satisfy the above conditions.
  • Next, an operation will be described in which a mobile terminal that transmitted a reservation packet to the base station receives an answer packet transmitted from the base station.
  • An answer packet output from the despread circuit 63 for an answer channel is detected with a detector and subjected to an error correction/decode process such as Viterbi decoding. With the above processes, it becomes possible to obtain the information of an allocated traffic channel and an allocated time slot contained in the answer packet. An initial transmission power holder 125 holds an initial transmission power signal contained in the answer packet, and inputs the initial transmission power signal to a data channel gain calculator 124 which calculates a gain so that a data packet can be transmitted at a transmission power designated by the initial transmission power signal. The calculated gain is set as the gain of a variable gain amplifier 68.
  • The data packet transmitted from the mobile terminal is amplified by the variable gain amplifier 68 at the gain designated by the data channel gain calculator 124. The amplified signal is modulated from the baseband signal into a signal in the carrier frequency band by a transmission radio module 69 and transmitted from the antenna 60 via the circulator 61.
  • Next, transmission power control while a mobile terminal transmits a data packet to the base station will be described.
  • A transmission power correction unit 123 derives the common transmission power control signal from a signal of the answer channel processed by the answer channel acquisition/despread circuit 63 and detector 64. The transmission power correction unit 123 selects a transmission power control signal of the uplink traffic channel now in use by its mobile terminal, from the common transmission power control signal. For example, in the example shown in FIG. 7, the mobile terminal transmitting a data packet by using the transmission channel 1 selects its transmission power control signal 111 a. The selected transmission power control signal is input to the gain calculator 124 which calculates a gain so that a data packet can be transmitted at a transmission power designated by the transmission control signal, and thereafter renews the gain of the variable gain amplifier 68. The amplified signal is modulated by the transmission radio module 69 from the baseband signal into a signal in the carrier frequency band, and transmitted from the antenna 60 via the circulator 61.
  • FIG. 9 illustrates the state of transmission power control realized by the above operations of the base station and a mobile terminal.
  • The base station inserts common transmission power control signals 142 a, 142 b, 142 c, . . . into a common answer channel shared by mobile terminals in the area and transits them. The common transmission power control signal 142 contains transmission power control signals for the respective traffic channels 1 to n. Each of the mobile terminals 1 to n transmitting data packets 1 to n to the base station derives the transmission power control signal of the traffic channel now in use by the mobile terminal, from the common transmission power control signals 142 a, 142 b, 142 c, . . . In accordance with the derived transmission power control signal, the mobile terminal changes the transmission power of the data packet.
  • In the state shown in FIG. 9, the width of a data packet is drawn to correspond to the receive level of the data packet at the base station. For example, in the uplink traffic channel 1, the mobile terminal controls the transmission power such that the transmission powers are increased, reduced, and increased in response to the reception of the common transmission power control signals 142 a, 142 b, and 142 c.
  • While a data packet is not transmitted by a mobile station, the transmission power control signal is neglected. The transmission power control signal is also neglected if it is received before a lapse time (called “control delay time”) necessary for measuring the received level of a data packet at the base station after the mobile terminal transmitted the data packet. The reason for this is a possibility that the transmission power control information received before the lapse of the control delay time may be the transmission power control information of a data packet transmitted by another mobile terminal, resulting in erroneous control to be made.
  • With the above operations, it becomes possible for the base station to perform transmission power control of the uplink traffic channels 1 to n by using the common control channel shared by the mobile terminals.
  • This first embodiment has the structure suitable for data communication, particularly for one way data communication. Two way data communication is performed in some case. In this case, the transmission power control signal may be contained in data of a downlink traffic channel. In the following, a mobile communication system of the second embodiment will be described which is suitable for two way communication and has a simple circuit structure, particularly of a mobile terminal.
  • FIG. 10 shows an example of the structure of a base station according to the second embodiment.
  • In FIG. 10, like constituent elements to those of the base station of the first embodiment are represented by identical reference numerals. The operation of the base station when a reservation packet is received is similar to the first embodiment.
  • The base station operates in the manner similar to the first embodiment to decode a received data packet and obtain reception data from the signal line 54. The unit 45 for measuring the received level of a traffic channel and the traffic channel transmission power control signal generator 46 generate transmission power control signals of respective uplink traffic channels.
  • In the second embodiment, if a mobile terminal transmits and receives a data packet to and from the base station by using an uplink traffic channel i and a downlink traffic channel k, the base station inputs the transmission power control signal of the uplink traffic channel i to the traffic channel transmission power control signal insert unit 59 of the downlink traffic channel k to insert the transmission power control signal into the data packet.
  • The operation will be detailed by taking as an example the case wherein the base station transmits a data packet by using a downlink traffic channel n to a mobile terminal which transmits a data packet to the base station by using an uplink traffic channel 1. In this case, the transmission power control signal of the uplink traffic channel 1 generated by the traffic channel transmission power control signal generator 46 is input to a traffic channel transmission power control signal insert unit 59 n of the downlink transmission channel n. The is traffic channel transmission power control signal insert unit 59 n inserts the transmission power control signal in the data packet. This data packet is spectrum spread by the spreader 57 n and multiplexed with other channel signals by the adder 58. The multiplexed signal is modulated by the transmission radio module 49 from the baseband signal into a signal of the carrier frequency band, and transmitted from the antenna 30 via the circulator 31.
  • An example of a mobile terminal of the second embodiment is shown in FIG. 11.
  • In FIG. 11, like constituent elements to those of the mobile terminal of the first embodiment shown in FIG. 8 are represented by identical reference numerals. A switch 70 is connected to 70 a to perform similar operations to the first embodiment, if the mobile terminal transmits a reservation packet, receives an answer packet transmitted from the base station, or only transmits a data packet to the base station (one way communication).
  • Next, an operation (two way communication) will be described in which a mobile terminal transmits and receives a data packet to and from the base station. In this case, the switch 10 is turned to the 70 b side.
  • A data packet is received via the antenna 60, circulator 61 and reception radio module 62, and subjected to a reception process by the traffic channel acquisition/despread circuit 63 b and detector 64. The data packet output from the detector is subjected to error correction/decoding by the decoder 65 to obtain reception data from the signal line 66. The data packet is also input to the transmission power correction unit 123 which derives the transmission power control signal inserted in the data packet and inputs it to the traffic channel gain calculator 124. The traffic channel gain calculator 124 calculates a gain of the variable gain amplifier 68 to renew the gain, similar to the first is embodiment.
  • With the base station and mobile terminals having the above structures and operating in the above manner, it becomes possible for a mobile terminal to perform transmission/reception of a data packet to/from the base station and reception of transmission power control by the base station, by using either the answer channel or traffic channel. Therefore, it is sufficient if only the mobile terminal has one set of a detector and a decoder, and so the circuit scale of the mobile terminal can be prevented from becoming large.
  • In the above embodiments, the invention has been applied to a mobile communication system of a reservation based access control scheme in which a base station transmits a transmission power control signal to each mobile terminal by using an answer channel. The invention is also applicable to a channel other than the answer channel if it is a common channel shared by mobile terminals. Namely, if a system uses a common channel shared by mobile terminals, the base station can perform transmission power control of a plurality of mobile terminals by transmitting transmission power control signals via the single common channel. Obviously, a channel dedicated to transmission power control may be provided to perform transmission power control of mobile terminals by transmitting transmission power control signals from the base station by using this dedicated channel.
  • While the present invention has been described above in conjunction with the preferred embodiments, one of ordinary skill in the art would be enabled by this disclosure to make various modifications to this embodiment and still be within the scope nd spirit of the invention as defined in the appended claims.

Claims (7)

1-26. (canceled)
27. A base station for communicating with a plurality of terminals in a CDMA method, comprising:
a control signal generator that generates transmission power control signals 1-n corresponding to uplink traffic channels 1-n for uplink data transmission with the plurality of terminals; and
a spreader that spreads the transmission power control signals constituted in an order of 1-n,
wherein the transmission power control signals thus spread are transmitted to the terminals via a channel in common to the plurality of terminals.
28. The base station according to claim 27, further comprising an adder that multiplexes the spread transmission power control signals with downlink traffic channels 1-n for downlink data transmission.
29. The base station according to claim 27, further comprising a receiver that receives a signal from a terminal,
wherein the control signal generator generates the transmission power control signal corresponding to the signal thus received.
30. A terminal for communicating with a base station in a CDMA method, comprising a despread circuit that despreads spread transmission power control signals by using a spread code in common to a plurality of terminals, with the spread transmission power control signals being transmitted from the base station via a channel in common to the plurality of terminals, and being configured in an order of 1-n corresponding to uplink traffic channels 1-n for uplink data transmission.
31. The terminal according to claim 30, further comprising a transmitter that transmits a signal in accordance with transmission power determined based on the transmission power control signal thus received.
32. The terminal according to claim 30, further comprising a transmission power correction unit that selects a transmission power control signal corresponding to the own terminal, from the transmission power control signals transmitted via the channel in common to the plurality of terminals.
US11/907,537 1996-12-06 2007-10-15 CDMA communication system and its transmission power control method Abandoned US20080045261A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP8326493A JPH10173594A (en) 1996-12-06 1996-12-06 Code division multiple access communication system and sending power control method
JP08-326493 1996-12-06
US08/985,281 US6307844B1 (en) 1996-12-06 1997-12-04 CDMA communication system and its transmission power control method
US09/818,510 US6483816B2 (en) 1996-12-06 2001-03-28 CDMA communication system and its transmission power control method
US10/262,935 US7006463B2 (en) 1996-12-06 2002-10-03 CDMA communication system and its transmission power control method
US11/300,354 US20060092886A1 (en) 1996-12-06 2005-12-15 CDMA communication system and its transmission power control method
US11/907,537 US20080045261A1 (en) 1996-12-06 2007-10-15 CDMA communication system and its transmission power control method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/907,537 US20080045261A1 (en) 1996-12-06 2007-10-15 CDMA communication system and its transmission power control method
US12/076,140 US20080170555A1 (en) 1996-12-06 2008-03-14 Wireless communication system and its transmission power control method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/300,354 Continuation US20060092886A1 (en) 1996-12-06 2005-12-15 CDMA communication system and its transmission power control method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/076,140 Continuation US20080170555A1 (en) 1996-12-06 2008-03-14 Wireless communication system and its transmission power control method

Publications (1)

Publication Number Publication Date
US20080045261A1 true US20080045261A1 (en) 2008-02-21

Family

ID=18188449

Family Applications (6)

Application Number Title Priority Date Filing Date
US08/985,281 Expired - Lifetime US6307844B1 (en) 1996-12-06 1997-12-04 CDMA communication system and its transmission power control method
US09/818,510 Expired - Lifetime US6483816B2 (en) 1996-12-06 2001-03-28 CDMA communication system and its transmission power control method
US10/262,935 Expired - Lifetime US7006463B2 (en) 1996-12-06 2002-10-03 CDMA communication system and its transmission power control method
US11/300,354 Abandoned US20060092886A1 (en) 1996-12-06 2005-12-15 CDMA communication system and its transmission power control method
US11/907,537 Abandoned US20080045261A1 (en) 1996-12-06 2007-10-15 CDMA communication system and its transmission power control method
US12/076,140 Abandoned US20080170555A1 (en) 1996-12-06 2008-03-14 Wireless communication system and its transmission power control method

Family Applications Before (4)

Application Number Title Priority Date Filing Date
US08/985,281 Expired - Lifetime US6307844B1 (en) 1996-12-06 1997-12-04 CDMA communication system and its transmission power control method
US09/818,510 Expired - Lifetime US6483816B2 (en) 1996-12-06 2001-03-28 CDMA communication system and its transmission power control method
US10/262,935 Expired - Lifetime US7006463B2 (en) 1996-12-06 2002-10-03 CDMA communication system and its transmission power control method
US11/300,354 Abandoned US20060092886A1 (en) 1996-12-06 2005-12-15 CDMA communication system and its transmission power control method

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/076,140 Abandoned US20080170555A1 (en) 1996-12-06 2008-03-14 Wireless communication system and its transmission power control method

Country Status (7)

Country Link
US (6) US6307844B1 (en)
EP (1) EP0847147B1 (en)
JP (1) JPH10173594A (en)
KR (1) KR100335846B1 (en)
CN (1) CN1164133C (en)
DE (2) DE69735459T2 (en)
MY (1) MY127528A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040087325A1 (en) * 2002-11-04 2004-05-06 Fang-Chen Cheng Shared control and signaling channel for users subscribing to data services in a communication system

Families Citing this family (102)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2839014B2 (en) * 1996-07-05 1998-12-16 日本電気株式会社 Transmission power control method for a code division multiplexing cellular system
CA2271878A1 (en) * 1996-11-18 1998-05-28 Siemens Aktiengesellschaft Method and base station system for configuration of a radio interface between a mobile station and a base station in a time-division multiplex mobile radio system for packet data transmission
US9525923B2 (en) 1997-12-17 2016-12-20 Intel Corporation Multi-detection of heartbeat to reduce error probability
US7936728B2 (en) 1997-12-17 2011-05-03 Tantivy Communications, Inc. System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
US7394791B2 (en) 1997-12-17 2008-07-01 Interdigital Technology Corporation Multi-detection of heartbeat to reduce error probability
US5914958A (en) 1997-10-28 1999-06-22 Motorola, Inc. Fast call setup in a CDMA dispatch system
US7184426B2 (en) 2002-12-12 2007-02-27 Qualcomm, Incorporated Method and apparatus for burst pilot for a time division multiplex system
US9118387B2 (en) 1997-11-03 2015-08-25 Qualcomm Incorporated Pilot reference transmission for a wireless communication system
US8134980B2 (en) 1998-06-01 2012-03-13 Ipr Licensing, Inc. Transmittal of heartbeat signal at a lower level than heartbeat request
US7773566B2 (en) 1998-06-01 2010-08-10 Tantivy Communications, Inc. System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
SG185139A1 (en) 2001-06-13 2012-11-29 Ipr Licensing Inc Transmittal of heartbeat signal at a lower level than heartbeat request
EP0940930B1 (en) * 1998-03-03 2012-09-26 NEC Corporation Method of controlling transmission power in a cellular type mobile communication system
AU761279B2 (en) * 1998-03-23 2003-05-29 Samsung Electronics Co., Ltd. Power control device and method for controlling a reverse link common channel in a CDMA communication system
ES2250942T3 (en) 1998-03-26 2006-04-16 Mitsubishi Denki Kabushiki Kaisha Communications device for spectrum staging.
KR100346192B1 (en) * 1998-04-13 2002-07-12 삼성전자 주식회사 Apparatus and method for designating spreading code of forward common channel in cdma communication system
US6181685B1 (en) 1998-04-23 2001-01-30 Motorola, Inc. Method and apparatus for group calls in a wireless CDMA communication system
US6222832B1 (en) 1998-06-01 2001-04-24 Tantivy Communications, Inc. Fast Acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system
US8072915B1 (en) * 1998-06-12 2011-12-06 Ericsson Ab Common power control channel in a CDMA system and a system and method for using such a channel
US6625466B1 (en) 1998-06-17 2003-09-23 Siemens Aktiengesellschaft Method and system for regulating the transmission power of a mobile station of a mobile radiotelephone system
US6275478B1 (en) * 1998-07-10 2001-08-14 Qualcomm Incorporated Methods and apparatuses for fast power control of signals transmitted on a multiple access channel
EP0977370B1 (en) * 1998-07-28 2005-10-05 Lucent Technologies Inc. Transmission power control for packet switched communication systems
AU5820899A (en) * 1998-09-11 2000-04-03 Sharewave, Inc. Shadow clients for computer networks
EP0993128A1 (en) * 1998-10-05 2000-04-12 Motorola, Inc. Power control in communications systems
CN1284395C (en) * 1998-11-09 2006-11-08 三星电子株式会社 Stand-by multiple access control apparatus and method for mobile communication system
AU750979B2 (en) * 1998-12-07 2002-08-01 Samsung Electronics Co., Ltd. Device and method for gating transmission in a CDMA mobile communication system
US6914889B1 (en) 1998-12-08 2005-07-05 Lucent Technologies Inc. Variable rate forward power control for multichannel applications
AT407483T (en) * 1999-03-12 2008-09-15 Qualcomm Inc Method and device for performance allocation to a reverse power control of a communication system
US6574267B1 (en) * 1999-03-22 2003-06-03 Golden Bridge Technology, Inc. Rach ramp-up acknowledgement
US6434367B1 (en) * 1999-06-11 2002-08-13 Lucent Technologies Inc. Using decoupled power control sub-channel to control reverse-link channel power
US8064409B1 (en) 1999-08-25 2011-11-22 Qualcomm Incorporated Method and apparatus using a multi-carrier forward link in a wireless communication system
EP1085676B1 (en) * 1999-09-16 2014-10-22 Alcatel Lucent Method of controlling power in a point to multipoint communication network and system for carrying out said method
KR100346227B1 (en) * 1999-09-18 2002-08-01 삼성전자 주식회사 Apparatus and method for noise power estimation in cdma mobile communication system
JP4481545B2 (en) * 1999-09-30 2010-06-16 テレフオンアクチーボラゲット エル エム エリクソン(パブル) Power control method and power control apparatus
US6621804B1 (en) 1999-10-07 2003-09-16 Qualcomm Incorporated Method and apparatus for predicting favored supplemental channel transmission slots using transmission power measurements of a fundamental channel
JP3621310B2 (en) 1999-10-07 2005-02-16 松下電器産業株式会社 A radio communication apparatus and transmission power control method
US7079523B2 (en) * 2000-02-07 2006-07-18 Ipr Licensing, Inc. Maintenance link using active/standby request channels
AU3673001A (en) 2000-02-07 2001-08-14 Tantivy Communications, Inc. Minimal maintenance link to support synchronization
US7551663B1 (en) 2001-02-01 2009-06-23 Ipr Licensing, Inc. Use of correlation combination to achieve channel detection
US6996069B2 (en) 2000-02-22 2006-02-07 Qualcomm, Incorporated Method and apparatus for controlling transmit power of multiple channels in a CDMA communication system
JP4385489B2 (en) * 2000-03-03 2009-12-16 ソニー株式会社 Communication system, communication method, and communication device
JP2001320326A (en) * 2000-03-03 2001-11-16 Sony Corp Communication system, communication method and equipment
US6633766B1 (en) * 2000-04-24 2003-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Frequency selective RF output power calibration using digital and analog power measurements for use in a cellular telecommunications system
US20010040877A1 (en) * 2000-05-09 2001-11-15 Motorola, Inc. Method of dynamic transmit scheduling using channel quality feedback
DE10029427A1 (en) * 2000-06-15 2001-12-20 Siemens Ag Transmission power control method between base station and data terminals by allocating respective transmission powers to packet data traffic channels
SE519303C2 (en) * 2000-06-20 2003-02-11 Ericsson Telefon Ab L M Device for narrow band communication in a multicarrier- systems
JP3415102B2 (en) 2000-06-27 2003-06-09 日本電気株式会社 Transmission power of Cdma communication control system and a transmission power control method
US6950669B2 (en) * 2000-07-05 2005-09-27 Telefonaktiebolaget Lm Ericsson (Publ) Power control algorithm for packet data based on queue/channel utilization
JP3738205B2 (en) 2000-08-12 2006-01-25 三星電子株式会社Samsung Electronics Co.,Ltd. Network transmission power optimization apparatus and method
US7068683B1 (en) * 2000-10-25 2006-06-27 Qualcomm, Incorporated Method and apparatus for high rate packet data and low delay data transmissions
US6973098B1 (en) 2000-10-25 2005-12-06 Qualcomm, Incorporated Method and apparatus for determining a data rate in a high rate packet data wireless communications system
US8155096B1 (en) 2000-12-01 2012-04-10 Ipr Licensing Inc. Antenna control system and method
GB2370452B (en) * 2000-12-19 2004-10-20 Inmarsat Ltd Communication method and apparatus
US7065155B2 (en) 2000-12-22 2006-06-20 Atheros Communications, Inc. Method and apparatus for a transceiver having a constant power output
US6954448B2 (en) 2001-02-01 2005-10-11 Ipr Licensing, Inc. Alternate channel for carrying selected message types
US8605686B2 (en) 2001-02-12 2013-12-10 Qualcomm Incorporated Method and apparatus for power control in a wireless communication system
US20030027587A1 (en) 2001-06-13 2003-02-06 Tantivy Communications, Inc. System and method for coordination of wireless maintenance channel power control
KR100487221B1 (en) * 2001-11-23 2005-05-03 삼성전자주식회사 Method and apparatus for controlling the transmission power of control information in a mobile communication system
US6961582B2 (en) * 2002-02-13 2005-11-01 Accton Technology Corporation Transmission power control method and system for CDMA communication system
CN100456661C (en) 2002-04-26 2009-01-28 智邦科技股份有限公司 Transmission power controlling system and method for code division multiplex receiving system
US7177658B2 (en) * 2002-05-06 2007-02-13 Qualcomm, Incorporated Multi-media broadcast and multicast service (MBMS) in a wireless communications system
JP3574446B2 (en) * 2002-09-19 2004-10-06 松下電器産業株式会社 Transmission power control method and a base station apparatus
TWI332326B (en) 2002-10-17 2010-10-21 Interdigital Tech Corp Power control for communications systems utilizing high speed shared channels
RU2332797C2 (en) * 2003-02-04 2008-08-27 Эл Джи Электроникс Инк. Uplink transmission power control method
US7660282B2 (en) 2003-02-18 2010-02-09 Qualcomm Incorporated Congestion control in a wireless data network
US7505780B2 (en) * 2003-02-18 2009-03-17 Qualcomm Incorporated Outer-loop power control for wireless communication systems
US7155236B2 (en) 2003-02-18 2006-12-26 Qualcomm Incorporated Scheduled and autonomous transmission and acknowledgement
US8023950B2 (en) 2003-02-18 2011-09-20 Qualcomm Incorporated Systems and methods for using selectable frame durations in a wireless communication system
US8081598B2 (en) 2003-02-18 2011-12-20 Qualcomm Incorporated Outer-loop power control for wireless communication systems
US8391249B2 (en) 2003-02-18 2013-03-05 Qualcomm Incorporated Code division multiplexing commands on a code division multiplexed channel
US8150407B2 (en) 2003-02-18 2012-04-03 Qualcomm Incorporated System and method for scheduling transmissions in a wireless communication system
US20040160922A1 (en) 2003-02-18 2004-08-19 Sanjiv Nanda Method and apparatus for controlling data rate of a reverse link in a communication system
US7215930B2 (en) 2003-03-06 2007-05-08 Qualcomm, Incorporated Method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication
US8705588B2 (en) 2003-03-06 2014-04-22 Qualcomm Incorporated Systems and methods for using code space in spread-spectrum communications
US20040219919A1 (en) * 2003-04-30 2004-11-04 Nicholas Whinnett Management of uplink scheduling modes in a wireless communication system
US8477592B2 (en) 2003-05-14 2013-07-02 Qualcomm Incorporated Interference and noise estimation in an OFDM system
CN100568769C (en) 2003-06-16 2009-12-09 株式会社Ntt都科摩 Control device and radio control method
US8489949B2 (en) 2003-08-05 2013-07-16 Qualcomm Incorporated Combining grant, acknowledgement, and rate control commands
US8694869B2 (en) 2003-08-21 2014-04-08 QUALCIMM Incorporated Methods for forward error correction coding above a radio link control layer and related apparatus
US8804761B2 (en) 2003-08-21 2014-08-12 Qualcomm Incorporated Methods for seamless delivery of broadcast and multicast content across cell borders and/or between different transmission schemes and related apparatus
US7318187B2 (en) * 2003-08-21 2008-01-08 Qualcomm Incorporated Outer coding methods for broadcast/multicast content and related apparatus
KR101163225B1 (en) * 2003-12-11 2012-07-05 엘지전자 주식회사 Method for transmitting control signal in multiple antenna system
US20050223432A1 (en) * 2004-02-02 2005-10-06 Pioneer Hi-Bred International, Inc. ODP2 promoter and methods of use
DE102004016581A1 (en) * 2004-03-31 2005-10-27 Nec Europe Ltd. Procedures for Settlement and Compensation Processes in Ad Hoc Networks
JP4977015B2 (en) * 2004-05-06 2012-07-18 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Communication system, primary station, and transmission power control method
US20050272455A1 (en) * 2004-06-04 2005-12-08 Nokia Corporation Management of devices
GB2417167B (en) 2004-08-13 2007-02-14 Ipwireless Inc Apparatus and method for communicating user equipment specific information in cellular communication system
JPWO2007023654A1 (en) * 2005-08-22 2009-02-26 日本電気株式会社 Mobile communication system, mobile communication terminal, and mobile communication method
US20070280377A1 (en) * 2006-06-02 2007-12-06 Rucki John S Apparatus and method for controlling the output power of a transmitter using a pilot channel power level
KR100978787B1 (en) 2006-06-16 2010-08-30 삼성전자주식회사 Method and apparatus for controlling power in a communication system
JP4940867B2 (en) 2006-09-29 2012-05-30 日本電気株式会社 Multiplexing method of control signal and reference signal, resource allocation method and base station in mobile communication system
RU2009119387A (en) 2006-11-08 2010-12-20 НТТ ДоСоМо, Инк. (JP) Mobile communication system, base station, mobile station and communication management method
US8009639B2 (en) * 2006-12-27 2011-08-30 Wireless Technology Solutions Llc Feedback control in an FDD TDD-CDMA system
JP4757314B2 (en) * 2006-12-28 2011-08-24 富士通株式会社 Wireless communication system, base station, and random access channel transmission method
CA2718644C (en) 2008-03-19 2015-10-06 Telefonaktiebolaget L M Ericsson (Publ) Improved uplink scheduling in a cellular system
US8364174B2 (en) * 2008-05-09 2013-01-29 Qualcomm Incorporated System and method for ran assisted location update
US8649284B2 (en) * 2008-07-01 2014-02-11 Telefonaktiebolaget Lm Ericsson (Publ) Cellular congestion and admission control based on ringing tones in unanswered calls
EP2322001B1 (en) 2008-09-03 2018-04-25 Thomson Licensing Method and apparatus for transmit power control in wireless networks
US9215043B2 (en) * 2008-11-19 2015-12-15 Futurewei Technologies, Inc. Systems and methods for scheduling and MU-MIMO in uplink Vo-IP for OFDMA/SCFDMA networks
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
US9002397B2 (en) 2010-06-29 2015-04-07 Qualcomm Incorporated Method and apparatus for device transmit power capping in wireless communications
US20120108282A1 (en) * 2010-08-25 2012-05-03 Qualcomm Incorporated Methods and apparatus for power control and interference management in wireless microphone transmission systems
US9629099B2 (en) * 2013-01-24 2017-04-18 Panasonic Intellectual Property Management Co., Ltd. Radio communication apparatus and transmission power control method

Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US784360A (en) * 1904-04-18 1905-03-07 Benjamin A Stevens Pin-resetting device for bowling-alleys.
US818829A (en) * 1905-06-13 1906-04-24 Keller Machine Company Tension device for warp-beams.
US835527A (en) * 1906-06-09 1906-11-13 Clarence H Howard Railroad-car.
US5487180A (en) * 1993-09-20 1996-01-23 Fujitsu Limited Method of determining initial transmission power
US5535228A (en) * 1993-02-19 1996-07-09 Motorola, Inc. Device and method for achieving rotational invariance in a multi-level trellis coding system
US5559790A (en) * 1993-07-23 1996-09-24 Hitachi, Ltd. Spread spectrum communication system and transmission power control method therefor
US5577024A (en) * 1993-07-08 1996-11-19 Nokia Mobile Phones Ltd. Multiple access radio system
US5579374A (en) * 1993-09-03 1996-11-26 Hitachi, Ltd. Independent cell system of forward and reverse links
US5604730A (en) * 1994-07-25 1997-02-18 Qualcomm Incorporated Remote transmitter power control in a contention based multiple access system
US5621723A (en) * 1994-09-27 1997-04-15 Gte Laboratories Incorporated Power control in a CDMA network
US5623486A (en) * 1994-05-20 1997-04-22 Ntt Mobile Communication Network Inc. Transmission power control method and apparatus for mobile communications using a CDMA (code division multiple access) system
US5713074A (en) * 1994-08-11 1998-01-27 Roke Manor Research Limited Mobile radio power control device using the comparison of retransmitted data
US5794129A (en) * 1995-07-14 1998-08-11 Nec Corporation Mobile communication system and base station for use therein
US5799005A (en) * 1996-04-30 1998-08-25 Qualcomm Incorporated System and method for determining received pilot power and path loss in a CDMA communication system
US5812938A (en) * 1994-07-11 1998-09-22 Qualcomm Incorporated Reverse link, closed loop power control in a code division multiple access system
US5828662A (en) * 1996-06-19 1998-10-27 Northern Telecom Limited Medium access control scheme for data transmission on code division multiple access (CDMA) wireless systems
US5991627A (en) * 1994-05-11 1999-11-23 Nokia Telecommunications Oy Control of handover and transmission power control of mobile station in a mobile telecommunications system
US5995796A (en) * 1998-01-08 1999-11-30 Xerox Corporation Haloelastomer and doped metal oxide film component
US6047015A (en) * 1995-10-20 2000-04-04 Matsushita Electric Industrial Co., Ltd. Mobile radio apparatus
US6195046B1 (en) * 1996-06-06 2001-02-27 Klein S. Gilhousen Base station with slave antenna for determining the position of a mobile subscriber in a CDMA cellular telephone system
US6226316B1 (en) * 1990-11-16 2001-05-01 Interdigital Technology Corporation Spread spectrum adaptive power control communications system and method
US6259724B1 (en) * 1996-10-18 2001-07-10 Telefonaktiebolaget L M Ericsson (Publ) Random access in a mobile telecommunications system

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056109A (en) 1989-11-07 1991-10-08 Qualcomm, Inc. Method and apparatus for controlling transmission power in a cdma cellular mobile telephone system
JP2585455B2 (en) 1990-06-05 1997-02-26 三菱電機株式会社 Communication channel assignment scheme of the mobile digital communication system
US5282662A (en) * 1992-12-14 1994-02-01 General Motors Corporation Rear seat for all purpose vehicle
FI933209A (en) * 1993-07-14 1995-01-15 Nokia Telecommunications Oy A method for controlling transmission power in a cellular radio system and the subscriber terminal equipment
US5671218A (en) * 1994-04-28 1997-09-23 Lucent Technologies Inc. Controlling power and access of wireless devices to base stations which use code division multiple access
US5809430A (en) * 1994-06-03 1998-09-15 Motorola, Inc. Method and apparatus for base selection in a communication system
JP2982856B2 (en) 1994-10-26 1999-11-29 エヌ・ティ・ティ移動通信網株式会社 Transmission power control method and transmission power control method communication device using
US5574747A (en) * 1995-01-04 1996-11-12 Interdigital Technology Corporation Spread spectrum adaptive power control system and method
US5673259A (en) * 1995-05-17 1997-09-30 Qualcomm Incorporated Random access communications channel for data services
US5818829A (en) * 1995-10-18 1998-10-06 Telefonaktiebolaget Lm Ericsson Method for increasing throughput capacity in a communication system
FI103555B (en) * 1996-06-17 1999-07-15 Nokia Mobile Phones Ltd The transmission power control in a wireless packet data transmission
JP3386098B2 (en) * 1996-06-20 2003-03-10 株式会社エヌ・ティ・ティ・ドコモ Signal transmission method in Cdma mobile communication system, the mobile station apparatus and base station apparatus
US5926747A (en) * 1996-09-05 1999-07-20 Airnet Communications Corp. Method and apparatus for dynamically optimizing the forward-link transmit power of a broadband multi-carrier radio signal
KR100243425B1 (en) * 1997-07-10 2000-02-01 곽치영 Method and apparatus of forward traffic channel power control for CDMA Wiredless Local Loop System

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US784360A (en) * 1904-04-18 1905-03-07 Benjamin A Stevens Pin-resetting device for bowling-alleys.
US818829A (en) * 1905-06-13 1906-04-24 Keller Machine Company Tension device for warp-beams.
US835527A (en) * 1906-06-09 1906-11-13 Clarence H Howard Railroad-car.
US6226316B1 (en) * 1990-11-16 2001-05-01 Interdigital Technology Corporation Spread spectrum adaptive power control communications system and method
US5535228A (en) * 1993-02-19 1996-07-09 Motorola, Inc. Device and method for achieving rotational invariance in a multi-level trellis coding system
US5577024A (en) * 1993-07-08 1996-11-19 Nokia Mobile Phones Ltd. Multiple access radio system
US5559790A (en) * 1993-07-23 1996-09-24 Hitachi, Ltd. Spread spectrum communication system and transmission power control method therefor
US5579374A (en) * 1993-09-03 1996-11-26 Hitachi, Ltd. Independent cell system of forward and reverse links
US5487180A (en) * 1993-09-20 1996-01-23 Fujitsu Limited Method of determining initial transmission power
US5991627A (en) * 1994-05-11 1999-11-23 Nokia Telecommunications Oy Control of handover and transmission power control of mobile station in a mobile telecommunications system
US5623486A (en) * 1994-05-20 1997-04-22 Ntt Mobile Communication Network Inc. Transmission power control method and apparatus for mobile communications using a CDMA (code division multiple access) system
US5812938A (en) * 1994-07-11 1998-09-22 Qualcomm Incorporated Reverse link, closed loop power control in a code division multiple access system
US5604730A (en) * 1994-07-25 1997-02-18 Qualcomm Incorporated Remote transmitter power control in a contention based multiple access system
US5713074A (en) * 1994-08-11 1998-01-27 Roke Manor Research Limited Mobile radio power control device using the comparison of retransmitted data
US5621723A (en) * 1994-09-27 1997-04-15 Gte Laboratories Incorporated Power control in a CDMA network
US5794129A (en) * 1995-07-14 1998-08-11 Nec Corporation Mobile communication system and base station for use therein
US6047015A (en) * 1995-10-20 2000-04-04 Matsushita Electric Industrial Co., Ltd. Mobile radio apparatus
US5799005A (en) * 1996-04-30 1998-08-25 Qualcomm Incorporated System and method for determining received pilot power and path loss in a CDMA communication system
US6195046B1 (en) * 1996-06-06 2001-02-27 Klein S. Gilhousen Base station with slave antenna for determining the position of a mobile subscriber in a CDMA cellular telephone system
US5828662A (en) * 1996-06-19 1998-10-27 Northern Telecom Limited Medium access control scheme for data transmission on code division multiple access (CDMA) wireless systems
US6259724B1 (en) * 1996-10-18 2001-07-10 Telefonaktiebolaget L M Ericsson (Publ) Random access in a mobile telecommunications system
US5995796A (en) * 1998-01-08 1999-11-30 Xerox Corporation Haloelastomer and doped metal oxide film component

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040087325A1 (en) * 2002-11-04 2004-05-06 Fang-Chen Cheng Shared control and signaling channel for users subscribing to data services in a communication system
US7680507B2 (en) * 2002-11-04 2010-03-16 Alcatel-Lucent Usa Inc. Shared control and signaling channel for users subscribing to data services in a communication system

Also Published As

Publication number Publication date
EP0847147A2 (en) 1998-06-10
US20080170555A1 (en) 2008-07-17
US6307844B1 (en) 2001-10-23
US7006463B2 (en) 2006-02-28
DE69735459C5 (en) 2013-07-11
JPH10173594A (en) 1998-06-26
US6483816B2 (en) 2002-11-19
DE69735459D1 (en) 2006-05-11
EP0847147A3 (en) 2000-08-30
CN1187743A (en) 1998-07-15
DE69735459T2 (en) 2006-10-05
US20060092886A1 (en) 2006-05-04
KR19980063634A (en) 1998-10-07
US20030053426A1 (en) 2003-03-20
MY127528A (en) 2006-12-29
EP0847147B1 (en) 2006-03-15
KR100335846B1 (en) 2002-04-25
US20010012276A1 (en) 2001-08-09
CN1164133C (en) 2004-08-25

Similar Documents

Publication Publication Date Title
US6587697B2 (en) Common control channel uplink power control for adaptive modulation and coding techniques
EP1208713B2 (en) Method and system for performing a handoff in a wireless communication system, such as a hard handoff
US6680927B2 (en) Spread spectrum communication device and spread spectrum communication method
AU716705B2 (en) Subscriber unit for a CDMA wireless communication system
KR100923230B1 (en) Spread spectrum time division user equipment for multiple downlink time slots
JP2934185B2 (en) Cdma cellular radio base station apparatus and mobile station apparatus and transmission method
EP1094644B1 (en) Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
ES2243061T3 (en) Allocation of code for sectorized radiocommunication systems.
EP0500689B1 (en) Method and apparatus for controlling transmission power in a cdma cellular mobile telephone system
US7532888B2 (en) CDMA mobile communication system, base station, mobile station and communication control method during soft handover
EP0955735B1 (en) Base and mobile station apparatus and transmission power control method
KR100874101B1 (en) A method and apparatus for controlling transmission power during the soft hand-off
US6408039B1 (en) Radio communication apparatus employing a rake receiver
EP0668664B1 (en) CDMA/TDD radio communication system
EP0610030B1 (en) Method and apparatus for transmitter power control in a cellular radio system
EP1062742B1 (en) Correction of signal-interference ratio measures
EP0993724B1 (en) Method and apparatus for data transmission within a broad-band communication system
US6678311B2 (en) High data CDMA wireless communication system using variable sized channel codes
JP4695109B2 (en) Method for transmitting frame, device for transmitting frame, and mobile station
JP4668490B2 (en) CDMA multiple access interference cancellation using signal estimation
US5604766A (en) Transmission power control method of a spread-spectrum communication system, and a spread-spectrum communication system employing the control method
KR100479779B1 (en) Remote transmitter power control method eseoui contention-based multiple access system
KR100632158B1 (en) Transmission power control of the pilot-based
US5485486A (en) Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
US6393005B1 (en) Method of controlling transmitting power of a base station in a CDMA mobile communication system

Legal Events

Date Code Title Description
AS Assignment

Owner name: HITACHI, LTD.,JAPAN

Free format text: MERGER;ASSIGNOR:HITACHI COMMUNICATION TECHNOLOGIES, LTD.;REEL/FRAME:023741/0708

Effective date: 20090701

Owner name: HITACHI, LTD., JAPAN

Free format text: MERGER;ASSIGNOR:HITACHI COMMUNICATION TECHNOLOGIES, LTD.;REEL/FRAME:023741/0708

Effective date: 20090701

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION