US20060183497A1 - Performing power control in a mobile communications system - Google Patents

Performing power control in a mobile communications system Download PDF

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US20060183497A1
US20060183497A1 US11/401,591 US40159106A US2006183497A1 US 20060183497 A1 US20060183497 A1 US 20060183497A1 US 40159106 A US40159106 A US 40159106A US 2006183497 A1 US2006183497 A1 US 2006183497A1
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mobile unit
error
detecting
power control
control signaling
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US11/401,591
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David Paranchych
Yiping Wang
Ashvin Chheda
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Nortel Networks Ltd
Apple Inc
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Nortel Networks Ltd
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Priority to US16884599P priority Critical
Priority to US09/696,491 priority patent/US7110785B1/en
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Priority to US11/401,591 priority patent/US20060183497A1/en
Publication of US20060183497A1 publication Critical patent/US20060183497A1/en
Assigned to APPLE INC. reassignment APPLE INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Rockstar Bidco, LP
Application status is Abandoned legal-status Critical

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/44TPC being performed in particular situations in connection with interruption of transmission
    • 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
    • H04W52/12Outer and inner loops
    • 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
    • H04W52/241TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo

Abstract

A mobile communications system includes base stations and mobile units. A power control scheme is provided in which a mobile unit can enter into a discontinuous transmission (DTX) mode. During DTX mode, the mobile unit is not transmitting traffic channels that can be monitored to determine frame errors so that the target ratio of energy per bit to noise spectral density (target Eb/No) can be adjusted. Instead, the base station monitors bit errors of bits in a pilot channel communicated by the mobile unit during DTX mode. Using this technique, the target Eb/No can be adjusted even when the mobile unit is not transmitting traffic channels, so that outer-loop power control can be performed. A number of mechanisms can also be used to detect when a mobile unit has entered DTX mode.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This is a divisional of U.S. Ser. No. 09/696,491, entitled “Performing Power Control in a Mobile Communications System,” filed Oct. 25, 2000, which claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application Ser. No. 60/168,845, entitled “Performing Power Control in a Mobile Communications System,” filed Dec. 3, 1999, both hereby incorporated by reference.
  • TECHNICAL FIELD
  • The invention relates to performing power control in a mobile communications system.
  • BACKGROUND
  • Mobile communications systems, such as cellular or personal communications services (PCS) systems, are made up of a plurality of cells. Each cell provides a radio communications center in which a mobile unit establishes a call with another mobile unit or a wireline unit connected to a public switched telephone network (PSTN). Each cell includes a radio base station, with each base station connected to a mobile switching center that controls processing of calls between or among mobile units or mobile units and PSTN units. In an alternative arrangement, the base stations may be connected to base station controllers that are in turn connected to the mobile switching center.
  • One type of protocol used in mobile communications is the code-division multiple access (CDMA) protocol, originally implemented as the IS-95 protocol. CDMA is based on a spread-spectrum technique in which multiple users have access to the same band of carriers. This is accomplished by assigning a unique orthogonal code (referred to as the Walsh code) to each mobile unit. To meet requirements for third generation (3G) wireless communications systems, the CDMA technology has been replaced with the CDMA 2000 family of standards. The standards in the CDMA 2000 family include the IS-2000-1, IS-2000-2, IS-2000-3, IS-2000-4, IS-2000-5, and IS-2000-6 (collectively referred to as the “IS-2000 standard”).
  • According to IS-2000, a mobile station may discontinue the transmission of traffic channels to preserve power and reduce interference when there is no data to send. Such a feature is referred to as the discontinuous transmission (DTX) mode. The DTX feature is available on fixed-rate traffic channels, such as the dedicated control channel and supplemental channel, in the reverse link between the base station and each mobile unit. The CDMA air-link is based on a forward link and reverse link between base stations and mobile units. The forward link is the link from the base station to the mobile unit, while the reverse link is the link from the mobile unit to the base station. Among the channels used in the reverse link are the dedicated control and supplemental channels, which are employed to carry traffic frames and other signaling from the mobile unit to the base station.
  • Conventionally, in performing outer-loop power control without DTX, such as in IS-95 CDMA systems, the target ratio of energy per bit to noise spectral density (referred to as the target Eb/No) is adjusted based on whether errors occurred in receiving frames. A target Eb/No may be specified for each mobile unit. The target Eb/No may be increased when the frame error rate (FER) rises above a predetermined threshold and decreased when the FER falls below the predetermined threshold. Alternatively, adjustment of the target Eb/No may be based on occurrence of frame errors rather than the FER crossing a threshold. By coordinating the step sizes of the increases and decreases in the target Eb/No, a target FER can be achieved.
  • If the transmission of traffic frames is discontinued, however, the conventional technique of controlling the target Eb/No based on the transmission of traffic frames during the period of silence is not possible, even if the receiver in the base station can detect that the transmission of frames has ceased. The reception of traffic frames is no longer available to determine exactly what target Eb/No is required for a given quality of reception. Without a way of adjusting the target Eb/No, reliable transmission of frames may not be possible when the mobile unit exits DTX mode and starts transmitting traffic frames again.
  • Setting a fixed target Eb/No does not entirely solve the problem, since the Eb/No required for successful transmission of traffic frames may vary during the period of silence, in which case no frames may be successfully received at the end of the silence period and a dropped call may result. The target Eb/No may alternatively be set to a high value to ensure reception at the end of the silence period. Such a high value may be the worst-case value based on the velocity of the mobile unit and the known channel conditions. However, setting a high target Eb/No may result in the transmission of excessive power on the pilot, traffic, and power control channels, which may significantly reduce the power reduction that is supposed to result from the use of DTX.
  • Thus, an improved method and apparatus for performing power control is needed in a mobile communications system.
  • SUMMARY
  • In general, according to one embodiment, a method of performing power control in a mobile communications system having a base station and a mobile unit comprises detecting an error in reception of predetermined information in a link between the base station and the mobile unit when traffic channels are not being communicated. A power control element is adjusted based on the detected error.
  • Some embodiments of the invention may have one or more of the following advantages. Effective power control is provided in a link between a mobile unit and a base station, even during periods of silence, such as during discontinuous transmission (DTX) mode. A balance between energy savings and reliable wireless communications can be achieved so that battery life in a mobile unit is extended while the likelihood of dropped calls is reduced.
  • Other features and advantages become apparent from the following description, from the drawings, and from the claims.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 illustrates an embodiment of a mobile communications system.
  • FIG. 2 is a block diagram of components in a mobile unit and base station in the mobile communications system of FIG. 1.
  • FIG. 3 is a flow diagram of the process of performing outer-loop power control in accordance with an embodiment.
  • FIGS. 4A-4B illustrate pilot channel and power channel subchannel structures.
  • DETAILED DESCRIPTION
  • In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible. For example, although reference is made to the code-division multiple access (CDMA) protocol in this description other alternative wireless standards can also be employed.
  • In accordance with some embodiments of the invention, power control, such as outer-loop power control in a CDMA system, can continue to be performed even though transmission of traffic frames in a wireless link between the mobile unit and base station has been discontinued during discontinuous transmission (DTX) mode. Although traffic signaling is discontinued on some traffic channels in DTX mode, control signaling with a known pattern may still be transmitted. Such control signaling may be monitored to detect for errors so that appropriate power control may be performed. In one embodiment, the power control includes adjusting a power control element such as the target ratio of energy per bit to noise spectral density (Eb/No). As used here, a “power control element” refers to any element (e.g., parameter, component, etc.) that can be adjusted to affect the transmission power of signals in wireless links between mobile units and base stations.
  • Referring to FIG. 1, a mobile communications system 10 according to one example arrangement is illustrated. The mobile communications system 10 includes a plurality of cell segments 12. As used here, “cell segments” may refer to entire cells, cell sectors, or other predefined portions of cells. Each cell segment 12 is associated with a base station 14 that is capable of communicating with one or more mobile units 16 within the geographic area covered by the base station 14.
  • In one embodiment, the mobile communications system 10 is a code-division multiple access (CDMA) system, such as a CDMA 2000 system. The CDMA 2000 family of standards includes the IS-2000-1, IS-2000-2, IS-2000-4, IS-2000-5, and IS-2000-6 standards.
  • As the mobile unit 16 crosses from one cell segment 12 to another cell segment, a hand-off procedure is performed by the base stations. CDMA provides for a soft hand-off procedure in which a mobile unit is directed to hand-off to the same frequency and is assigned to an adjacent cell or sector without dropping the original radio frequency (RF) link. During the soft hand-off process, the mobile unit may keep two or more RF links active. In a CDMA system, a RF link refers to a link associated with a given pseudorandom noise (PN) code. CDMA systems also perform softer hand-offs in which mobile units perform hand-offs within different sectors of the same cell site.
  • The base stations 14 and the cell segments 12 are connected to a mobile switching center (MSC) 18 that provides the main control functions of the mobile communications system 10. In other arrangements, base station controllers (BSCs) may be provided between corresponding groups of base stations 12 and the MSC 18. The MSC 18 may be connected to other MSCs that are responsible for other service areas. The MSC 18 may also be connected to a public switched telephone network (PSTN) 20 that is coupled to wireline units to enable communications between the mobile units 16 and the wireline units.
  • The air link between each base station 14 and each mobile unit 16 includes a forward link 22 (from the base station to the mobile unit) and a reverse link 24 (from the mobile unit to the base station). According to CDMA 2000, the reverse link 24 includes a pilot channel, a power control subchannel, a traffic channel, and other channels. The traffic channel may include a dedicated control channel (DCCH), fundamental channel (FCH), supplemental channel (SCH), and other channels. The DCCH and SCH in the traffic channel are fixed-rate channels on which DTX mode is available. During DTX mode, the fixed-rate channels in the reverse link 24 are not transmitted to preserve power and to reduce interference. However, transmission of the pilot channel and power control subchannel in the reverse link 24 continues.
  • The pilot channel in the reverse link 24 (also referred to as a reverse pilot channel) is an unmodulated, direct-sequence spread spectrum signal transmitted continuously by a mobile unit. A reverse pilot channel provides a phase reference for coherent demodulation and may provide a mechanism for signal strength measurement. The reverse power control subchannel is a subchannel on the reverse pilot channel used by the mobile unit to control the power of a base station when operating under certain configurations.
  • The reverse DCCH is a portion of the reverse traffic channel used in some configurations for the transmission of higher-level data and control information from a mobile unit to a base station. The reverse FCH is also a portion of the reverse traffic channel that carries higher-level data and control information from a mobile unit to a base station. A reverse SCH is a portion of the traffic channel, which operates in conjunction with a reverse FCH or reverse DCCH to provide higher data rate services and on which higher-level data is transmitted. In the forward link 22, the forward traffic channel may also include a forward DCCH, a forward FCH, and a forward SCH.
  • During active communications of traffic channels between the base station and mobile unit, the base station monitors for occurrence of frame errors in one or more of the reverse DCCH, reverse FCH, and reverse SCH to adjust the target Eb/No in the base station, and the mobile unit monitors one or more of the forward DCCH, forward FCH, and forward SCH to adjust the target Eb/No in the mobile unit. The target Eb/No values determine the frame error rate (FER) on the corresponding channel.
  • However, when the mobile unit enters DTX mode, the transmitter in the mobile unit 16 can cease transmission of DCCH and SCH traffic frames without warning the base station 14. As a result, the base station 14 is not notified explicitly when transmission of traffic frames has stopped. This results in an outer-loop power control problem, especially if fast power control is being employed.
  • Once traffic frames stop, conventional techniques of detecting for errors in the reception of traffic frames is not available. As a result, the ratio of energy per bit to noise spectral density (Eb/No) cannot be accurately adjusted by conventional techniques during this period of traffic silence. Typically, the target Eb/No is increased when data is received in error and decreased when data is received correctly. An increase in the target Eb/No results in reduced capacity in a cell due to the likelihood of enhanced interference between mobile units. On the other hand, a decrease in the target Eb/No (and thus transmission power) increases the likelihood that the call may be dropped. To achieve proper outer-loop power control to avoid these issues, in accordance with some embodiments, control signaling instead of the traffic signaling is used to perform adjustment of the target Eb/No value. Also, to enable outer-loop power control based on the control signaling instead of traffic signaling, a mechanism is provided to detect that a mobile unit has entered DTX mode.
  • In further embodiments, the base station 14 can also enter DTX mode, in which case adjustment of Eb/No by the mobile unit is also based on control signaling rather than traffic channels.
  • Referring to FIG. 2, the components of a base station 14 and mobile unit 16 are illustrated. In the base station 14, one or more control units 100 may be run under the control of one or more software routines 102. Such software routines may initially be stored in a storage device 104 (or plural storage devices) and executed by the control unit 100 to perform programmed tasks. One of the software routines 102 executable in the base station 14 is a power control routine to perform power control tasks, including outer-loop power control. The control unit 100 is capable of communicating through a radio interface 106 (that includes a transmitter 122 and receiver 124) with the radio links 22, 24.
  • The base station 14 also includes a medium access control (MAC) layer 136 (containing modules for managing communications on the communications link, in this case, RF links); a signaling link access control (LAC) layer 138 (providing a radio-independent interface and containing modules for controlling data flow and transporting the data flow to the MAC layer 136); and an upper layer 140 including signaling control modules, protocol stacks, and the software routines 102.
  • In the mobile unit 16, one or more control units 110 are coupled to one or more storage units 112 and to a radio interface 114 (including a transmitter 118 and receiver 120) that is capable of communicating with the air links 22, 24. Software modules 116 may also be executable in the mobile unit 16. In another embodiment, instead of software routine 116, the control unit 110 may be configured in hardware or by firmware to perform pre-programmed tasks. The mobile unit 16 similarly includes a MAC layer 130, a LAC layer 132, and an upper layer 134. As with the base station 14, one of the software modules 116 may be programmed to perform power control tasks.
  • Referring to FIG. 3, the procedure performed by the base station 14 by which outer-loop power control is performed is described. In further embodiments, the same process or some modified form of the process may be performed by the mobile unit 16. The power control routine first detects (at 202) if the mobile unit is in DTX mode. If not, then conventional power control may be performed, in which traffic channels in the reverse link are monitored (at 204) to determine the FER. Based on the determined FER, the target Eb/No ratio is adjusted (at 206). The target Eb/No is increased if the FER rises above a threshold and is decreased if the FER falls below the threshold. Alternatively, outer loop power control may be driven by the occurrence of frame errors rather than by the FER crossing a threshold.
  • However, if the power control routine determines (at 202) that the mobile unit is in DTX mode, then the base station 14 checks (at 208) for errors in bits received on the pilot channel. As shown in FIG. 4A, on the reverse link according to IS-2000, a power control group 300 includes a power control subchannel 304 that is time multiplexed with a pilot channel 302, with the two transmitted at the same power level. In the power control group 300, the first three-quarters of each interval is allocated to the pilot channel 302, while the last quarter is devoted to the power control subchannel 304. An interval (the length of the power control group 300) in one embodiment is typically about 1.25 milliseconds (ms). The polarity of the power control subchannel 304 is unknown, but the polarity of the pilot channel 302 is known. Therefore, in addition to its role in the recovery of the channel phase and gain, the pilot channel 302 may be used by the base station to detect the BER of the pilot channel 302 (or equivalently, the power control subchannel 304, since the two are sent at the same power).
  • The predetermined information in the pilot channel 302 includes known values (all ones in one embodiment). If any of the received bits is not at the expected state, then a bit error is recorded (at 210), such as in a storage register 122 in the storage device 104 in the base station 14 (FIG. 2). To detect errors in the pilot channel bits according to one embodiment, an error detector circuit 125 (FIG. 2) is implemented in the radio interface 106. Alternatively, the error detector circuit 125 may be implemented in software (such as in the power control routine) or as a separate component in the base station 14. Each base station 14 performs such detection for each mobile unit 16 (in DTX mode) that the base station 14 is communicating with. The same mobile unit may communicate with multiple base stations 14 due to the possibility of soft hand-off. Thus, for any given mobile unit 16, plural base stations 14 may be performing the tasks described in FIG. 3.
  • The power control tasks performed in the base station 14, as illustrated in FIG. 3, may also be performed by the mobile unit 16. If the base station 14 enters DTX mode, the control signaling may be monitored to detect for errors. In one example, a user dedicated pilot channel may be defined in the forward link to enable outer loop power control during DTX mode of the base station 14. However, other control signals from the base station 14 may be used, provided such control signals have a known state. To detect for errors, the mobile unit 16 includes an error detection circuit 121.
  • The detection and comparison acts at 208 and 210 may be performed in one of several ways. In one embodiment, a fixed number of bits in the pilot channel may be observed in a given time interval. The BER is then computed for that time window. The storage register 122 that records the result of a prior comparison may be cleared in preparation for the accumulation of bit errors in a disjoint time window. In another embodiment, a “sliding window” may be used in which the last N bits in the pilot channel are stored and the BER is updated with the arrival of each new pilot bit measurement. In further embodiments, other methods may be used to derive the BER from the sequence of pilot bit errors.
  • Based on the detection of error or lack thereof, the power control routine in the base station adjusts (at 212) the target Eb/No, once per frame interval. The target Eb/No is increased if the BER reported on each link is greater than the threshold value and decreased if one of them is lower than the threshold value. An “excessive BER event” is one in which the measured BER of a link is larger than the BER threshold. The up and down step sizes of the target Eb/No are derived from a desired probability of an excessive BER event in the same way that the step sizes are derived from the target FER in normal IS-2000 operation. Once the mobile unit comes out of DTX mode, the target Eb/No value that has been updated in the base station is used to generate (at 214) power control commands for the mobile unit, which are communicated to the mobile unit. The power control commands from the base station to the mobile unit controls the output power of the transmitter 118 (FIG. 2) in the mobile unit.
  • In the illustrated embodiment of FIG. 3, bit errors in the pilot channel are used to adjust the target Eb/No during DTX mode, but normal detection of traffic frame errors is used during non-DTX mode (i.e., during active transmission of traffic frames from the mobile unit to the base station). In another embodiment, the bit errors in the pilot channel can be used to perform adjustment of the target Eb/No whether the mobile unit 16 is in DTX mode or not.
  • The mechanism for detecting when a mobile has entered DTX mode (at 202 in FIG. 3) can be implemented in a number of different ways. A first mechanism is power detection based, and a second mechanism is signaling based.
  • With the power detection based mechanism, the receiver 124 in the base station 14 attempts to detect the traffic channel transmission disruption based on the received signal. In one embodiment, the power level (or Eb/No) of the traffic channel on the DCCH is used for detection since the power level is relatively high when traffic bits are sent and low when they are not. To account for power level variations with fading, the fading effect is eliminated by using the ratio of (Eb/No)traffic to (Eb/No)pcb, where pcb stands for power control bits, as a decision variable. The ratio correlates fading over traffic bits with fading over power control bits in the same power control group.
  • The decision variable V is measured over a frame: V = ( Eb / No ) traffic ( Eb / No ) pcb , ( Eq . 1 )
    The value of V is then compared to a pre-determined threshold T. If V is greater than T, then the receiver decides that a normal frame is being transmitted. If V is less than or equal to T, then the receiver assumes the current frame is a DTX frame, but still tries to detect the frame. If the frame is decoded correctly, then that frame is not really gated off (as is the case in DTX mode) so that it is determined that the mobile unit is not in DTX mode. However, if the detection of the frame indicates a bad frame, then the base station decides that the mobile unit is in DTX mode.
  • In the alternative mechanism, which is the signaling-based mechanism, one or two power control bits for each frame are used as a traffic channel transmission disruption indicator. In this way, the base station is informed whether the traffic channel in the frame is transmitting or not. For example, the first power control bit in a frame can be used to indicate the traffic channel status of the current frame. A “1” represents the presence of traffic channel, and a “0” stands for the traffic channel being gated off (in DTX mode). If the receiver detects a bit indicating that a normal frame is being transmitted, then the base station 14 determines that the mobile unit is not in DTX mode. However, if the detected bit indicates that the current frame is a DTX frame, then the receiver still tries to detect the frame (in case the detected bit is erroneous). If the frame is decoded correctly, then that means the frame is not really a DTX frame. However, if the detection indicates a bad frame, then DTX mode is detected.
  • By using embodiments of the invention, more effective power management is provided in each mobile unit. Adjustment of the Eb/No value during periods of traffic silence allows for reduction in power levels (and thereby increase the battery life of a mobile unit) while ensuring reliable communications due to traffic patterns and conditions after the mobile unit exits DTX mode and traffic signaling is started again. Although described in conjunction with the DTX mode of a mobile unit, the procedure described may be used for the base station if it is capable of entering DTX mode or some mode in which the base station stops sending traffic signaling. In further embodiments, the mobile communications system 10 may be a system other than a CDMA or CDMA 2000 system.
  • Various software routines or modules described herein are executable on control units in corresponding systems or nodes. Instructions of such software routines or modules may be stored in one or more storage units. Each control unit includes a microprocessor, a microcontroller, a processor card (including one or more microprocessors or microcontrollers), or other control or computing devices. As used here a “controller” refers to software, hardware, or a combination of both.
  • The storage units include one or more machine-readable storage media for storing data and instructions. The storage media include different forms of memory including semiconductor memory devices such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs), and flash memories; magnetic disks such as fixed, floppy and removable disks; other magnetic media including tape; and optical media such as compact discs (CDs) or digital video discs (DVDs). Instructions that make up the various software routines or modules in various systems or nodes and stored in respective storage units when executed by a respective control unit cause the corresponding system or node to perform programmed acts.
  • The instructions of the software routines or modules are loaded or transported into the system or node in one of many different ways. For example, code segments including instructions stored on floppy disks, CD or DVD media, a hard disk, or transported through a network interface card, modem, or other interface device are loaded into the system and executed as corresponding software routines or modules. In the loading or transport process, data signals that are embodied in carrier waves (transmitted over telephone lines, network lines, wireless links, cables, and the like) may communicate the code segments, including instructions, to the system or node. Such carrier waves may be in the form of electrical, optical, acoustical, electromagnetic, or other types of signals.
  • While the invention has been disclosed with respect to a limited number of embodiments, those skilled in the art will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover such modifications and variations as fall within the true spirit and scope of the invention.

Claims (19)

1. A method of performing power control in a mobile communications system having a base station and a mobile unit, comprising:
detecting an error in control signaling transmitted over a reverse link between the base station and the mobile unit when traffic channels are not being communicated in the reverse link; and
adjusting a power control element based on the detected error,
wherein adjusting the power control element comprises adjusting a target ratio of energy per bit to noise spectral density based on the detected error in the control signaling.
2. The method of claim 1, further comprising receiving a pilot channel from the mobile unit over the link, the control signaling comprising the pilot channel, wherein detecting the error in control signaling comprises detecting the error in the pilot channel from the mobile unit.
3. The method of claim 1, wherein detecting the error comprises detecting an error in the control signaling over a given period of time.
4. The method of claim 1, wherein detecting the error comprises detecting an error in a given number of samples of the control signaling.
5. The method of claim 4, wherein detecting the error comprises detecting an error in a given number of bits of the control signaling.
6. The method of claim 1, further comprising communicating a power control command based on the power control element to affect transmission power of the mobile unit.
7. The method of claim 1, wherein detecting the error comprises detecting a bit error rate in the control signaling of the reverse link.
8. The method of claim 1, further comprising receiving the control signaling over a reverse link according to a code-division multiple access protocol.
9. The method of claim 1, further comprising detecting that the mobile unit is in a discontinuous transmission mode, wherein detecting the error and adjusting the power control element are performed while the mobile unit is in the discontinuous transmission mode.
10. The method of claim 9, wherein detecting that the mobile unit is in discontinuous transmission mode comprises detecting a power level of a traffic channel transmitted by the mobile unit.
11. The method of claim 9, wherein detecting that the mobile unit is in discontinuous transmission mode comprises detecting a state of a predetermined information field.
12. The method of claim 11, wherein the information field comprises one or more power control bits of a data frame transmitted by the mobile unit.
13. The method of claim 9, wherein adjusting the power control element is based on the detected error if the mobile unit is detected to be in the discontinuous transmission mode, the method further comprising adjusting the power control element based on a frame error rate of traffic channels when the mobile unit is detected to be not in discontinuous transmission mode.
14. An article comprising at least one storage medium containing instructions that when executed cause a system to:
detect an error in control signaling transmitted over a reverse link from a mobile unit when traffic is not being communicated in the reverse link; and
adjust a target ratio of energy per bit to noise spectral density based on the detected error in the control signaling.
15. The article of claim 14, wherein detecting the error in the control signaling comprises detecting the error in a pilot channel.
16. The article of claim 14, wherein the instructions when executed cause a system to further communicate a power control command based on the adjusted target ratio of energy per bit to noise spectral density to affect transmission power of the mobile unit.
17. The article of claim 14, wherein the instructions when executed cause the system to further detect that the mobile unit is in a discontinuous transmission mode, wherein detecting the error and adjusting the target ratio of energy per bit to noise spectral density are performed while the mobile unit is in the discontinuous transmission mode.
18. A system for use in a communications system, comprising:
a receiver to receive control signaling from a mobile unit; and
a controller to:
detect an error in the control signaling received from the mobile unit in the reverse link when traffic is not being communicated from the mobile unit; and
adjust a target ratio of energy per bit to noise spectral density based on the detected error in the control signaling.
19. The system of claim 18, wherein the controller detects the error in the control signaling when the mobile unit is in discontinuous transmission mode.
US11/401,591 1999-12-03 2006-04-11 Performing power control in a mobile communications system Abandoned US20060183497A1 (en)

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Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030086381A1 (en) * 2001-10-19 2003-05-08 Terry Stephen E. System for improved power savings during full DTX mode of operation in the downlink
US20040162098A1 (en) * 2003-02-18 2004-08-19 Yongbin Wei Outer-loop power control for wireless communication systems
US20070097916A1 (en) * 2001-06-25 2007-05-03 Airvana, Inc., A Massachusetts Corporation Radio network control
US20080194286A1 (en) * 2003-02-18 2008-08-14 Qualcomm Incorporated Systems and methods for performing outer loop power control in wireless communication systems
US7751835B2 (en) 2005-10-04 2010-07-06 Airvana, Inc. Non-circular paging areas
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
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
US8085696B2 (en) 2006-07-14 2011-12-27 Airvana Networks Solutions, Inc. Dynamic modification of route update protocols
US8099504B2 (en) 2005-06-24 2012-01-17 Airvana Network Solutions, Inc. Preserving sessions in a wireless network
US8134976B2 (en) 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8145221B2 (en) 2005-12-16 2012-03-27 Airvana Network Solutions, Inc. Radio network communication
US8145179B2 (en) 2002-10-25 2012-03-27 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
US8150407B2 (en) 2003-02-18 2012-04-03 Qualcomm Incorporated System and method for scheduling transmissions in a wireless communication system
US8169944B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US8195187B2 (en) 2001-06-25 2012-06-05 Airvana Network Solutions, Inc. Radio network control
US8194770B2 (en) 2002-08-27 2012-06-05 Qualcomm Incorporated Coded MIMO systems with selective channel inversion applied per eigenmode
US8201039B2 (en) 2003-08-05 2012-06-12 Qualcomm Incorporated Combining grant, acknowledgement, and rate control commands
US8203978B2 (en) 2002-10-25 2012-06-19 Qualcomm Incorporated Multi-mode terminal in a wireless MIMO system
US8208364B2 (en) 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8218609B2 (en) 2002-10-25 2012-07-10 Qualcomm Incorporated Closed-loop rate control for a multi-channel communication system
US8320301B2 (en) 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US8358714B2 (en) 2005-06-16 2013-01-22 Qualcomm Incorporated Coding and modulation for multiple data streams in a communication system
US8391249B2 (en) 2003-02-18 2013-03-05 Qualcomm Incorporated Code division multiplexing commands on a code division multiplexed channel
US8477592B2 (en) 2003-05-14 2013-07-02 Qualcomm Incorporated Interference and noise estimation in an OFDM system
US8526966B2 (en) 2003-02-18 2013-09-03 Qualcomm Incorporated Scheduled and autonomous transmission and acknowledgement
US8548387B2 (en) 2003-03-06 2013-10-01 Qualcomm Incorporated Method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication system
CN103369640A (en) * 2012-03-29 2013-10-23 中兴通讯股份有限公司 Base station power saving method and device thereof
US8570988B2 (en) 2002-10-25 2013-10-29 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8576894B2 (en) 2003-03-06 2013-11-05 Qualcomm Incorporated Systems and methods for using code space in spread-spectrum communications
US8619702B2 (en) 2005-12-16 2013-12-31 Ericsson Evdo Inc. Radio network control
US8699452B2 (en) 2003-02-18 2014-04-15 Qualcomm Incorporated Congestion control in a wireless data network
US20140105085A1 (en) * 2012-10-11 2014-04-17 Qualcomm Incorporated Devices and methods for facilitating discontinuous transmission on access terminals
US8843638B2 (en) 2007-12-13 2014-09-23 Ericsson Evdo Inc. Handing off active connections
US8855226B2 (en) 2005-05-12 2014-10-07 Qualcomm Incorporated Rate selection with margin sharing
US8873365B2 (en) 2002-10-25 2014-10-28 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US9100919B2 (en) 2012-02-21 2015-08-04 Qualcomm Incorporated Wireless communication device power reduction method and apparatus
US9154274B2 (en) 2002-10-25 2015-10-06 Qualcomm Incorporated OFDM communication system with multiple OFDM symbol sizes
US9161308B2 (en) 2013-08-26 2015-10-13 Qualcomm Incorporated Devices and methods for facilitating autonomous discontinuous transmission in access terminals
US20160044739A1 (en) * 2013-04-05 2016-02-11 Kyocera Corporation Base station, user terminal, and communication control method
US9473269B2 (en) * 2003-12-01 2016-10-18 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
US9998379B2 (en) 2003-02-18 2018-06-12 Qualcomm Incorporated Method and apparatus for controlling data rate of a reverse link in a communication system

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002353621B2 (en) * 2001-11-19 2004-12-23 Samsung Electronics Co., Ltd. Method and apparatus for uplink transmission power control in a CDMA communication system
KR20030052038A (en) * 2001-12-20 2003-06-26 엘지전자 주식회사 Method for handoff in high data rate networks
WO2004025887A2 (en) * 2002-09-13 2004-03-25 Strix Systems, Inc. Network access points using multiple devices
US7706824B2 (en) * 2002-09-27 2010-04-27 Telefonaktiebolaget L M Ericsson (Publ) Requesting and controlling access in a wireless communications network
US7299402B2 (en) * 2003-02-14 2007-11-20 Telefonaktiebolaget Lm Ericsson (Publ) Power control for reverse packet data channel in CDMA systems
US20040165560A1 (en) * 2003-02-24 2004-08-26 Harris John M. Method and apparatus for predicting a frame type
US8254358B2 (en) * 2003-03-06 2012-08-28 Ericsson Ab Communicating a broadcast message to change data rates of mobile stations
US7746816B2 (en) * 2003-03-13 2010-06-29 Qualcomm Incorporated Method and system for a power control in a communication system
KR100975242B1 (en) * 2003-03-13 2010-08-11 퀄컴 인코포레이티드 Method and system for a data transmission in a communication system
US7630731B2 (en) * 2003-09-08 2009-12-08 Lundby Stein A Apparatus, system, and method for managing reverse link communication
US7724701B2 (en) * 2003-09-30 2010-05-25 Qualcomm Incorporated Method and apparatus for controlling reverse link data rate of a mobile station in a communication system with reverse link common rate control
CN1993906B (en) * 2004-07-22 2010-04-28 三菱电机株式会 The base station and mobile devices
US7792048B2 (en) * 2004-09-30 2010-09-07 Alcatel-Lucent Usa Inc. Outer loop power control in a communication system
US7936720B2 (en) * 2005-04-29 2011-05-03 Nortel Networks Limited Active set management enhancement for reliable soft handoff in 1xEV-DO system
US8094630B2 (en) 2005-12-16 2012-01-10 Airvana Network Solutions, Inc. Radio frequency dragging prevention
CN100584063C (en) 2007-06-22 2010-01-20 清华大学 An energy-saving method applied in GSM base station
EP2811803A1 (en) * 2007-11-30 2014-12-10 Alcatel Lucent Method for performing resource allocation in a wireless communication network and base station

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933781A (en) * 1997-01-31 1999-08-03 Qualcomm Incorporated Pilot based, reversed channel power control
US5933782A (en) * 1996-07-29 1999-08-03 Ntt Mobile Communications Network Inc. Downlink transmission power control scheme for mobile communication system using site diversity
US6208699B1 (en) * 1999-09-01 2001-03-27 Qualcomm Incorporated Method and apparatus for detecting zero rate frames in a communications system
US6438119B1 (en) * 1998-02-14 2002-08-20 Samsung Electronics, Co., Ltd. Data communication device and method for mobile communication system with dedicated control channel
US6571104B1 (en) * 1999-09-07 2003-05-27 Lucent Technologies Inc. Power control with effective Eb/N0

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603096A (en) * 1994-07-11 1997-02-11 Qualcomm Incorporated Reverse link, closed loop power control in a code division multiple access system
US5727033A (en) * 1994-11-30 1998-03-10 Lucent Technologies Inc. Symbol error based power control for mobile telecommunication system
US5884187A (en) * 1996-03-13 1999-03-16 Ziv; Noam A. Method and apparatus for providing centralized power control administration for a set of base stations
US6341224B1 (en) * 1996-06-27 2002-01-22 Ntt Mobile Communications Network, Inc. Power controller for mobile communication system wherein a signal to interference threshold is dynamically moved based on an error rate measurement
FI106666B (en) * 1997-01-24 2001-03-15 Nokia Networks Oy A power control method of discontinuous transmission,
US6286122B1 (en) * 1997-07-03 2001-09-04 Nokia Mobile Phones Limited Method and apparatus for transmitting DTX—low state information from mobile station to base station
CA2288682C (en) * 1998-03-26 2003-04-15 Samsung Electronics Co., Ltd. Device and method for controlling powers of orthogonal channel and quasi-orthogonal channel in cdma communication system
KR100651457B1 (en) * 1999-02-13 2006-11-28 삼성전자주식회사 Method of contiguous outer loop power control in dtx mode of cdma mobile communication system
EP1088408B1 (en) * 1999-05-12 2008-07-16 Samsung Electronics Co., Ltd. Method for supporting a discontinuous transmission mode in a base station in a mobile communication system
US6731948B1 (en) * 1999-05-12 2004-05-04 Samsung Electronics Co., Ltd. Method for supporting a discontinuous transmission mode in a base station in a mobile communication system
US6463042B1 (en) * 1999-05-28 2002-10-08 Nokia Mobile Phones Ltd. Mobile station having power saving mode for packet data
US6590874B1 (en) * 1999-09-30 2003-07-08 Nortel Networks Limited Method and system for implementing outer loop power control in discontinuous transmission mode using explicit signalling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933782A (en) * 1996-07-29 1999-08-03 Ntt Mobile Communications Network Inc. Downlink transmission power control scheme for mobile communication system using site diversity
US5933781A (en) * 1997-01-31 1999-08-03 Qualcomm Incorporated Pilot based, reversed channel power control
US6438119B1 (en) * 1998-02-14 2002-08-20 Samsung Electronics, Co., Ltd. Data communication device and method for mobile communication system with dedicated control channel
US6208699B1 (en) * 1999-09-01 2001-03-27 Qualcomm Incorporated Method and apparatus for detecting zero rate frames in a communications system
US6571104B1 (en) * 1999-09-07 2003-05-27 Lucent Technologies Inc. Power control with effective Eb/N0

Cited By (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8160020B2 (en) 2001-06-25 2012-04-17 Airvana Network Solutions, Inc. Radio network control
US20070097916A1 (en) * 2001-06-25 2007-05-03 Airvana, Inc., A Massachusetts Corporation Radio network control
US8195187B2 (en) 2001-06-25 2012-06-05 Airvana Network Solutions, Inc. Radio network control
US9019935B2 (en) 2001-06-25 2015-04-28 Ericsson Evdo Inc. Radio network control
US20030086381A1 (en) * 2001-10-19 2003-05-08 Terry Stephen E. System for improved power savings during full DTX mode of operation in the downlink
US7768953B2 (en) * 2001-10-19 2010-08-03 Interdigital Technology Corporation System for improved power savings during full DTX mode of operation in the downlink
US8194770B2 (en) 2002-08-27 2012-06-05 Qualcomm Incorporated Coded MIMO systems with selective channel inversion applied per eigenmode
US8913529B2 (en) 2002-10-25 2014-12-16 Qualcomm Incorporated MIMO WLAN system
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
US9048892B2 (en) 2002-10-25 2015-06-02 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US9031097B2 (en) 2002-10-25 2015-05-12 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US9154274B2 (en) 2002-10-25 2015-10-06 Qualcomm Incorporated OFDM communication system with multiple OFDM symbol sizes
US8134976B2 (en) 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US9013974B2 (en) 2002-10-25 2015-04-21 Qualcomm Incorporated MIMO WLAN system
US8145179B2 (en) 2002-10-25 2012-03-27 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
US9240871B2 (en) 2002-10-25 2016-01-19 Qualcomm Incorporated MIMO WLAN system
US8873365B2 (en) 2002-10-25 2014-10-28 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US8170513B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
US8169944B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US9312935B2 (en) 2002-10-25 2016-04-12 Qualcomm Incorporated Pilots for MIMO communication systems
US9967005B2 (en) 2002-10-25 2018-05-08 Qualcomm Incorporated Pilots for MIMO communication systems
US8750151B2 (en) 2002-10-25 2014-06-10 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8203978B2 (en) 2002-10-25 2012-06-19 Qualcomm Incorporated Multi-mode terminal in a wireless MIMO system
US8208364B2 (en) 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8218609B2 (en) 2002-10-25 2012-07-10 Qualcomm Incorporated Closed-loop rate control for a multi-channel communication system
US8320301B2 (en) 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US8355313B2 (en) 2002-10-25 2013-01-15 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8711763B2 (en) 2002-10-25 2014-04-29 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US8570988B2 (en) 2002-10-25 2013-10-29 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8462643B2 (en) 2002-10-25 2013-06-11 Qualcomm Incorporated MIMO WLAN system
US8483188B2 (en) 2002-10-25 2013-07-09 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8934329B2 (en) 2002-10-25 2015-01-13 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US8023950B2 (en) 2003-02-18 2011-09-20 Qualcomm Incorporated Systems and methods for using selectable frame durations in a wireless communication system
US20040162098A1 (en) * 2003-02-18 2004-08-19 Yongbin Wei Outer-loop power control for wireless communication systems
US20080194286A1 (en) * 2003-02-18 2008-08-14 Qualcomm Incorporated Systems and methods for performing outer loop power control in wireless communication systems
US7505780B2 (en) * 2003-02-18 2009-03-17 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
US8081598B2 (en) 2003-02-18 2011-12-20 Qualcomm Incorporated Outer-loop power control for wireless communication systems
US8977283B2 (en) 2003-02-18 2015-03-10 Qualcomm Incorporated Scheduled and autonomous transmission and acknowledgement
US9998379B2 (en) 2003-02-18 2018-06-12 Qualcomm Incorporated Method and apparatus for controlling data rate of a reverse link in a communication system
US8699452B2 (en) 2003-02-18 2014-04-15 Qualcomm Incorporated Congestion control in a wireless data network
US8150407B2 (en) 2003-02-18 2012-04-03 Qualcomm Incorporated System and method for scheduling transmissions in a wireless communication system
US8526966B2 (en) 2003-02-18 2013-09-03 Qualcomm Incorporated Scheduled and autonomous transmission and acknowledgement
US8676128B2 (en) 2003-03-06 2014-03-18 Qualcomm Incorporated Method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication system
US8548387B2 (en) 2003-03-06 2013-10-01 Qualcomm Incorporated Method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication system
US8705588B2 (en) 2003-03-06 2014-04-22 Qualcomm Incorporated Systems and methods for using code space in spread-spectrum communications
US8576894B2 (en) 2003-03-06 2013-11-05 Qualcomm Incorporated Systems and methods for using code space in spread-spectrum communications
US8477592B2 (en) 2003-05-14 2013-07-02 Qualcomm Incorporated Interference and noise estimation in an OFDM system
US8201039B2 (en) 2003-08-05 2012-06-12 Qualcomm Incorporated Combining grant, acknowledgement, and rate control commands
US8489949B2 (en) 2003-08-05 2013-07-16 Qualcomm Incorporated Combining grant, acknowledgement, and rate control commands
US9876609B2 (en) 2003-12-01 2018-01-23 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
US9473269B2 (en) * 2003-12-01 2016-10-18 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
US8855226B2 (en) 2005-05-12 2014-10-07 Qualcomm Incorporated Rate selection with margin sharing
US8358714B2 (en) 2005-06-16 2013-01-22 Qualcomm Incorporated Coding and modulation for multiple data streams in a communication system
US8099504B2 (en) 2005-06-24 2012-01-17 Airvana Network Solutions, Inc. Preserving sessions in a wireless network
US7751835B2 (en) 2005-10-04 2010-07-06 Airvana, Inc. Non-circular paging areas
US8145221B2 (en) 2005-12-16 2012-03-27 Airvana Network Solutions, Inc. Radio network communication
US8619702B2 (en) 2005-12-16 2013-12-31 Ericsson Evdo Inc. Radio network control
US8085696B2 (en) 2006-07-14 2011-12-27 Airvana Networks Solutions, Inc. Dynamic modification of route update protocols
US8843638B2 (en) 2007-12-13 2014-09-23 Ericsson Evdo Inc. Handing off active connections
US9100919B2 (en) 2012-02-21 2015-08-04 Qualcomm Incorporated Wireless communication device power reduction method and apparatus
CN103369640A (en) * 2012-03-29 2013-10-23 中兴通讯股份有限公司 Base station power saving method and device thereof
US9078266B2 (en) * 2012-10-11 2015-07-07 Qualcomm Incorporated Devices and methods for facilitating discontinuous transmission on access terminals
US20140105085A1 (en) * 2012-10-11 2014-04-17 Qualcomm Incorporated Devices and methods for facilitating discontinuous transmission on access terminals
US20160044739A1 (en) * 2013-04-05 2016-02-11 Kyocera Corporation Base station, user terminal, and communication control method
US9161308B2 (en) 2013-08-26 2015-10-13 Qualcomm Incorporated Devices and methods for facilitating autonomous discontinuous transmission in access terminals

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