US20050136960A1 - Power control method - Google Patents

Power control method Download PDF

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Publication number
US20050136960A1
US20050136960A1 US10/736,897 US73689703A US2005136960A1 US 20050136960 A1 US20050136960 A1 US 20050136960A1 US 73689703 A US73689703 A US 73689703A US 2005136960 A1 US2005136960 A1 US 2005136960A1
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Prior art keywords
power
connection
power control
transceiver node
control parameter
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English (en)
Inventor
Bogdan Timus
Niklas Denkert
Arne Simonsson
Jonas Pettersson
Marten Ericson
Niclas Wiberg
Fredrik Gunnarsson
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Priority to US10/736,897 priority Critical patent/US20050136960A1/en
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TIMUS, BOGDAN, WIBERG, NICLAS, ERICSON, MARTEN, PETTERSSON, JONAS, SIMONSSON, ARNE, DENKERT, NIKLAS, GUNNARSSON, FREDRIK
Priority to PCT/EP2004/053334 priority patent/WO2005060120A1/en
Priority to EP04804721.1A priority patent/EP1698068B1/en
Priority to CN2004800375721A priority patent/CN1894866B/zh
Priority to TW093138997A priority patent/TWI382688B/zh
Publication of US20050136960A1 publication Critical patent/US20050136960A1/en
Priority to HK07107338.9A priority patent/HK1102946A1/xx
Priority to US11/902,659 priority patent/US7899484B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/221—TPC being performed according to specific parameters taking into account previous information or commands using past power control commands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff

Definitions

  • the present invention relates to downlink power control in wireless communication systems, such as Wideband Code Division Multiple Access (WCDMA) systems.
  • WCDMA Wideband Code Division Multiple Access
  • the main resource in a WCDMA downlink is the carrier power of the base station.
  • the maximum carrier power limits the number of users that can be served, the service quality as well as the coverage of the base station.
  • Each connection needs sufficient dedicated channel power to meet its associated quality requirement in terms of block error rate and thus provide acceptable perceived quality of service to the end user. Nevertheless, it is also important to utilize the power efficiently and not use more power than necessary, and therefore the transmitter power in the base station is regularly updated.
  • the user equipment sends transmitter power control (TPC) commands, i.e. ‘power up’ or ‘power down’ indications, to the network. These commands are used in the base station to update the dedicated power of the UE.
  • TPC transmitter power control
  • the default algorithm is to step-wise update the power, using the TPC command to define whether the new power value is to be the previous power value plus or minus a fixed power step size. Provided that saturation does not occur, the power control command is always granted.
  • There are two options associated with the default power control algorithm the first of which reduces the risk of misinterpreted TPC commands, and the second limits the power raise of the power control through a sliding window size and a threshold.
  • Wireless communication systems are generally provided with means for admission control and means for disconnecting services, but these are relatively slow and not designed for handling system instabilities. Therefore, there is a need for mechanisms that are able to handle this on a small time scale with fast actions.
  • the international patent application [4] addresses the problem of diverging transmitter output power levels of two or more base stations with respect to a mobile station in macro-diversity communication.
  • the respective base station transmitter output powers for the mobile station are adjusted in response to the power control instructions from the mobile station and the respective current base station transmitter output powers for the mobile station.
  • the adjustments can be performed in fixed or continuous steps.
  • Step size adjustments based on TPC history, mobility speed and bit error rate (BER) probability is e.g. described in documents [5], [6] and [7].
  • a general object of the present invention is to provide a method for downlink power control that improves the stability of wireless communication systems.
  • a specific object is to achieve efficient utilization of power resources in communication systems with shared resources.
  • Another object is to eliminate the risk of temporary running out of transmitter power.
  • Still another object is to provide a power control mechanism suitable for WCDMA systems.
  • the present invention proposes an overall approach to downlink power control.
  • a base station determines a power control parameter, such as a maximum connection-specific transmitter power, a power step size or a power increase probability, based on its current total transmitter power
  • the power control parameter is then used by the base station to distribute transmitter power to the connection.
  • power control is performed using the current total transmitter power together with other input parameters related to a connection-specific code power and/or information indicating the degree of priority associated with the connection.
  • a transceiver node and a communication system are provided.
  • FIG. 1 is a schematic overview of an exemplary WCDMA communication system in which the present invention can be used;
  • FIG. 2 illustrates downlink power control messaging in accordance with the present invention
  • FIG. 3 is a flow chart of a method for downlink power control according to a preferred embodiment of the present invention.
  • FIG. 4A -B are diagrams illustrating code power and code power increase obtained with conventional power control
  • FIG. 5A -C are diagrams illustrating power increase probability, code power and code power increase in accordance with an exemplary embodiment of the present invention.
  • FIG. 6 is a diagram illustrating the relation between a power control parameter, code power and carrier power in accordance with an exemplary embodiment of the present invention.
  • FIG. 1 is a schematic overview of an exemplary WCDMA communication system in which the present invention can be used.
  • the illustrated system 100 comprises a Radio Access Network (RAN), e.g. a Universal Terrestrial Radio Access Network (UTRAN), and a core network 130 .
  • the RAN performs radio-related functions and is responsible for establishing connections between user equipment 110 , such as mobile phones and laptops, and the rest of the network.
  • the RAN typically contains a large number of Base Transceiver Stations (BTS) 122 , also referred to as Node B, and Radio Network Controllers (RNC) 124 .
  • BTS Base Transceiver Stations
  • RNC Radio Network Controllers
  • Each BTS serves the mobile terminals within its respective coverage area and several BTS are controlled by a RNC.
  • Typical functions of the RNC are to assign frequencies, spreading or scrambling codes and channel power levels.
  • the RNC 124 provides access to the core network 130 , which e.g. comprises switching centers, support nodes and databases corresponding to those of a Global System for Mobile communication/General Packet Radio Service (GSM/GPRS) core network, and generally also includes multimedia processing equipment.
  • the core network communicates with external networks 140 , such as the Internet, and Public Switched Telephone Networks (PSTN), Integrated Services Digital Networks (ISDN) and other Public Land Mobile Networks (PLMN).
  • PSTN Public Switched Telephone Networks
  • ISDN Integrated Services Digital Networks
  • PLMN Public Land Mobile Networks
  • the present invention is well suited for and will primarily be described in connection with WCDMA communication, for example High-speed Downlink Shared Channel (HS-DSCH) systems. Nevertheless, it should be understood that other communication systems where multiple users can utilize the same power resource simultaneously also lie within the scope of the invention.
  • Systems where the power utilization of a node affects adjacent nodes due to high interference are also suited for the invention.
  • Such systems for instance include time-multiplexed or code-multiplexed Orthogonal Frequency Division Multiplexing (OFDM) and Time Division Multiple Access (TDMA) systems and systems using Multi Carrier Power Amplifiers (MCPA).
  • OFDM Orthogonal Frequency Division Multiplexing
  • TDMA Time Division Multiple Access
  • MCPA Multi Carrier Power Amplifiers
  • Power control for the downlink (forward) channel in particular serves to provide each mobile station with a satisfactory signal level from the base station.
  • the mobile station measures the received signal on the downlink channel and based on the measurements requests the base station to adjust its transmit power.
  • fast power control (1500 Hz) is in WCDMA standardized for both up- and downlink.
  • the UE sends a transmitter power control command TPC(t) to the network 1500 times per second, and each command states either ‘power up’ or ‘power down’.
  • This command is used in the base station to update the dedicated power of the UE p(t).
  • the 3GPP standardized downlink power control algorithms include one default algorithm with two options [1].
  • the step size ⁇ can have four values: 0.5, 1, 1.5 or 2 dB. It is mandatory for UTRAN to support a step size of 1 dB, while support of other step sizes is optional. The only reason for not granting the power control command is if the power saturates, i.e.
  • the first option aims at limiting the risk of misinterpreted TPC commands. Each TPC command is repeated three consecutive slots, and the actual update rate is thereby reduced to 500 Hz.
  • the second option limits the power raise of power control by defining a sliding window size Swin and a threshold th.
  • the present invention is based on the recognition that a most efficient downlink power control can be obtained by changing the power dedicated to a respective connection in response to the total transmitter power situation.
  • the total transmitter power of the base station is a limited resource and it is therefore desirable to control the system with regard to this parameter.
  • a power control mechanism that directly responds to the most crucial power parameter can be achieved.
  • the present invention thus proposes an overall control approach where downlink power control is based on the total transmitter power of the base station.
  • This will now be further described with reference to FIG. 2 , in which a transceiver node 122 and two mobile terminals 110 are shown.
  • the transceiver node is capable of communicating with the mobile terminals over respective wireless connections.
  • the transceiver node 122 is typically arranged at the network side, e.g. in a radio access network such as UTRAN, and enables wireless units to be connected to the rest of the network.
  • the transceiver node can for instance comprise or be associated with a (radio) base station such as a Node B or a BTS and/or radio control functionality such as an RNC or a Base Station Controller (BSC).
  • a (radio) base station such as a Node B or a BTS
  • radio control functionality such as an RNC or a Base Station Controller (BSC).
  • BSC Base Station Controller
  • the wireless units/mobile terminals 110 are illustrated as cellular phones. However, the invention is also applicable on communication with other wireless unit, including personal digital assistants and laptop computers.
  • the base station is associated with a total transmitter (downlink) power P DL , also referred to as downlink carrier power.
  • This total transmitter power comprises both common power (used e.g. for pushing information to end users, for pilot signals and for common/shared channels) and power for channels dedicated to specific mobile terminals.
  • the current total transmitter power P DL (t) represents all downlink power resources, common and connection-specific, used at the transceiver node at a particular point of time t. In other words, the total transmitter power is a measure of the overall resource allocation at the transceiver node.
  • the available downlink power resources are represented by a maximum transmitter (downlink) power P DL,max , which is transceiver node specific.
  • transmitter (downlink) powers p i for each connection i also referred to as the downlink code power of a respective connection.
  • the current connection-specific transmitter power p t (t) represents the downlink power allocated to connection i by the base station at a particular point of time t.
  • the code power allocation is performed according to the power control algorithm of Eq. (1), but according to the present invention this power allocation is handled in an unproved way that will now be described.
  • the wireless unit 110 sends a request for a power change (e.g. a power increase command) to the base station 122 .
  • a power change e.g. a power increase command
  • the request is not always granted.
  • the connection-specific power decision is expressed through one or several power control parameters, which preferably directly or indirectly relate to a maximum value or a power change rate of the connection-specific transmitter power.
  • the power control parameters are determined based on the current total transmitter power of the base station and thereafter used to distribute transmitter power to the particular connection.
  • the power p i dedicated to connection i depends on the total downlink power P DL .
  • FIG. 3 is a flow chart of a method for downlink power control summarizing the main principles of a preferred embodiment of the invention.
  • a transmitter power change request from a mobile terminal is received at a base station over a wireless connection.
  • This request can for example comprise a standard WCDMA TPC command and the invention is applicable to both increase and decrease commands. In particular, it is useful for handling situations with repeated power increase commands.
  • the base station determines at least one power control parameter based on its current total transmitter power in step S 3 .
  • This preferably involves executing a predetermined power distribution function that presents a smooth transitional behavior as the current total transmitter power approaches its maximum value, or alternatively the power control parameter may be decided based on a predetermined threshold value for the total transmitter power.
  • the power control parameter is preferably related to a maximum connection-specific transmitter power and/or the power change rate of the connection-specific transmitter power.
  • the total transmitter power of the base station is preferably continuously measured at the base station (step S 2 ). However, in some embodiments this parameter may be determined elsewhere and forwarded to the transceiver node.
  • the current total transmitter power is not necessarily the only input parameter affecting the power control parameters (besides the TPC value).
  • the power control parameter can e.g. be an aggregate power control parameter calculated by combining several separately computed power control parameters with different inputs.
  • transmitter power is in step S 4 distributed to the connection by the base station in accordance with the determined power control parameter.
  • the power control parameter can be directly or indirectly affecting the actual power distribution.
  • An example of the latter is to indirectly restrict the power (p/t) in Eq. (1)) through a power control parameter related to the highest bit rate allowed for the connection.
  • the procedure in FIG. 3 is typically repeated regularly during an ongoing connection, since the mobile terminal will repeatedly ask for more or less power as the conditions change.
  • the behavior of respective connections is adjusted depending on the behavior of the entire shared power resource.
  • Conventional methods for downlink power control focuses entirely on individual connections. Since the mobile terminal does not have any knowledge about the power situation for other links, this implies a considerable risk of overallocating or temporary running out of transmitter power.
  • the invention offers a more efficient power control mechanism.
  • a major advantage is that it can be used to ensure that no attempts are made on the network side to allocate more power resources than available. Hence, the risk of temporary running out of transmitter power can be eliminated, resulting in a preserved system stability.
  • Another advantage of the invention is that it enables a smooth response to power increase requests from the user equipment.
  • the allocated power can be made to rise smoothly when the maximum transmitter power is approached, which leads to a more controlled behavior of the base station transmitter power.
  • the control is preferably performed on a comparatively small time scale, which results in fast adjustments as the overall power situation changes.
  • the present invention By performing power control at the network side and considering the overall power situation for the base station, the present invention thus improves the system stability.
  • the improved stability in turn results in an enhancement of both the capacity and the quality of the services experienced by the users.
  • Wireless communication systems in general are associated with trade-offs between coverage, quality and load.
  • a key issue is to balance service coverage against system stability, i.e. optimize the resource (base station downlink powers) utilization, such that a good service coverage is obtained at low loads and a good system stability is obtained at high loads.
  • the present invention enables the above factors to be properly balanced, e.g. by reducing the coverage or providing a soft degeneration of the quality when the load increases.
  • the power control parameter is determined by a combination of the total transmitter power (downlink carrier power) of the base station and the connection-specific transmitter power (downlink code power).
  • the power control is then related to the connection-specific resource utilization in addition to the overall resource utilization of all links.
  • power saturation can be avoided and besides the smooth transitional behavior at high total transmitter powers (i.e. close to P DL,max ) it is also possible to make distinctions between different connections. Connections using a lot of code power can for example be “punished” through stronger power restrictions.
  • this solution is normally easy to implement and does not require any additional signaling (e.g. between RNC and Node B in WCDMA) since both the carrier power and the code power can be measured at the base station.
  • the means for imposing power restrictions according to the invention are preferably to adapt the maximum dedicated code power p i,max ; to state a probability ⁇ i of granting a power change request command; and/or to adapt the power step size ⁇ i.
  • Exemplary embodiments of the invention with power control by means of each of these respective power control parameters will now be described.
  • the exemplifying power control algorithms work for values both in linear [W] and logarithmic scale [dBW or dBm], but values in linear scale will be assumed if nothing else is stated.
  • a preferred means to reduce the possibility of a connection to contribute to the downlink carrier power is to decrease the maximum dedicated code power p i,max , i.e. the upper power limit of an individual dedicated channel.
  • each connection is typically further limited by a lower maximum dedicated code power. The higher the downlink carrier power, the tighter the maximum code power.
  • a second example (5) presents a simpler method where the maximum dedicated code power can have two different values depending on whether the carrier power is below a threshold P DL,low or not.
  • p i , max ⁇ p max , upper P DL ⁇ P DL , low p max , lower P DL ⁇ P DL , low ( 5 )
  • P DL may be used together with one or more other input parameters for determining the maximum downlink code power.
  • each input can be used to compute the maximum power, and the aggregate of these computed values is used as the maximum dedicated code power.
  • the aggregate is computed according to (6).
  • the base station increases the dedicated channel power by a step a upon receiving a transmitter power up command from the wireless unit. Only the maximum dedicated code power p i,max can hinder the power increase due to be granted.
  • grant of a received power up command is instead associated with an assigned probability ⁇ inc,i (possibly zero), referred to as a power increase probability.
  • connection-specific transmitter power pi(t) remains at the same level, or it is decreased by the step A. The latter is more efficient in penalizing a connection.
  • FIGS. 4 and 5 illustrate load-based downlink power control according to the invention with power increase probability as power control parameter as compared with conventional default power control.
  • FIG. 4A -B show the prior-art code power behavior for a connection to a wireless unit that is consistently asking for more power. The base station allocates power to the connection in accordance with the standardized control algorithm of Eq. (1) and (2).
  • FIG. 4A contains normalized code power values for the respective time slots, whereas FIG. 4B shows the power changes since the last slot.
  • the diagrams clearly show the linear scale effects of the logarithmic scale power control (1).
  • the power upsteps in Watt increase exponentially as the code power of the connection increases (before saturation at slot 30 ). This constitutes an instabilizing property of the conventional power control algorithm.
  • FIG. 5B -C corresponds to FIG. 4A -B but this time the power control is performed based on P DL and code power through the power control probabilities of FIG. 5A .
  • the power increase probability decreases as the code power and carrier power increases, and this in turn makes the power control more graceful while approaching the maximum code and carrier powers.
  • a second example (8) presents a simpler method where the power increase probability switches between 1 and another fixed value ⁇ inc,lower depending on whether the carrier power is below P DL, low or not.
  • ⁇ inc , i ⁇ 1 P DL ⁇ P DL , low ⁇ inc , lower P DL ⁇ P DL , low ( 8 )
  • the factor ⁇ inc, i, pi can for instance be calculated according to equation (10) or (11) below.
  • the power increase depends linearly on the dedicated code power p i , when the latter is greater than p low and less than p max, i . Otherwise, ⁇ inc, i ⁇ 1.
  • ⁇ inc, i 1 ⁇ (( p i ⁇ p low )/( p max,i ⁇ p low )) n (10)
  • the second example (11) uses a simpler method where the power increase probability switches between 1 and another fixed value ⁇ inc,lower depending on whether the carrier power is below plow or not.
  • ⁇ inc , i ⁇ 1 p i ⁇ p low ⁇ inc , lower p i ⁇ p low ( 11 )
  • each input can be used to compute the power increase probability, and the aggregate of these computed values is used as the power increase probability.
  • the aggregate is computed according to (12).
  • Inputs 2 and 3 can (but do not have to) include the connection-specific transmitter power.
  • ⁇ inc, i, aggregate ⁇ inc, i , P DL * ⁇ inc, i, input 2 * ⁇ inc, i, input 3 (12) Power Control Step Size
  • the base station increases the dedicated channel power by a fixed step d in dB, when receiving a power up TPC command from the mobile terminal. Only the maximum dedicated code power can hinder the power increase.
  • the size of the power change (upward or downward) may be either decreased or increased.
  • a power increase request from the mobile terminal may even result in zero or negative values of ⁇ , thus corresponding to a refused increase command. Since only the upward steps are critical for downlink stability, it can sometimes be preferred to limit the step size adaptation to upward steps, while letting the downward steps remain constant.
  • N floor( ⁇ norm / ⁇ desired ) and ⁇ norm is a possible adjustment step (e.g. 1 dB).
  • a higher downlink carrier power generally results in a lower upward step size.
  • the upward step size depends linearly on the downlink carrier power and decreases to zero when the carrier power approaches its maximum level. This is illustrated by equation (13) where ⁇ param is a parameter and ⁇ norm is the maximum power step size.
  • ⁇ i min( ⁇ norm , ⁇ param ( P DL, max ⁇ P DL )/ P DL,max ) (13)
  • the upward and downward step sizes are separately adjusted and depend linearly on the downlink carrier power.
  • the upward step decreases to zero when the carrier power approaches its maximum level, while the downward step decreases to zero at low carrier powers. This is illustrated below (14), where ⁇ param is a parameter, ⁇ norm is the maximum power step size and P DL,lower is parameter indicating the lower carrier power level.
  • each input can be used to calculate a respective step size, and the aggregate of these preliminary step size values is used as the step size through which the power control is effectuated.
  • the step size can for example depend linearly on the downlink carrier power and the downlink code power [Watt] and decrease to zero when the carrier power and/or the code power approaches the maximum levels, as illustrated by equation (16).
  • ⁇ i min( ⁇ norm , ⁇ param (P DL,max ⁇ P DL )*( p i,max ⁇ p i ) (16)
  • FIG. 6 Power control with a combined downlink carrier power and downlink code power utilization according to Eq. (16) is illustrated in FIG. 6 .
  • Power step size vs. downlink carrier power and downlink code power is illustrated.
  • the maximum carrier power P DL,max is 20 W
  • the maximum code power p i,max is 1 W
  • ⁇ param 0.1 dB
  • ⁇ norm 1 dB. It is evident that infinitesimal step sizes are applied at high carrier powers and/or at high code powers, and thereby efficiently preventing the system from dramatically increasing the powers at high loads.
  • Eq. (16) can also be used for power control with power increase probability as code parameter.
  • the above examples have primarily used actual (not normalized) power parameters. However, sometimes, e.g. for base stations with different maximum downlink carrier power, it can be relevant to consider the downlink carrier power relative the maximum carrier power as the input. Similarly, in some situations, for example when different connections have different maximum downlink code power, it can be relevant to consider the downlink code power relative maximum code power as the input to algorithms based on code power.
  • the methods will work the same if a carrier power parameter is replaced by the same parameter divided by the maximum downlink carrier power and a code power parameter is replaced by the same parameter divided by the maximum downlink code power, respectively.
  • the input power data typically varies fast and heavily, it can in many cases be advisable to use filters in connection with the described downlink power control functions.
  • the variance can with filtering be reduced such that the power control parameters are subject merely to slowly changing input data.
  • the downlink power control is based on a combination of the total transmitter power and the degree of priority associated with the respective connections.
  • the main idea is to avoid a situation where all connections experience unsatisfactory quality of service by adopting a proactive strategy to penalize some connections to save others.
  • the power control parameters used to distribute transmitter power to a particular connection are in this case determined based on the total transmitter power together with connection-specific information indicating the degree of priority associated with the connection.
  • the connection-specific information preferably comprises one or more so-called degree of priority indicators DPI.
  • the power pi dedicated to connection i depends on P DL and the DPI parameter for the connection DPI i .
  • the DPI parameter is representing the importance/relevance/priority of a particular connection at a particular point of time in a predefined way. It generally describes features or the current or expected behavior of the end user/mobile terminal and can comprise user-related, device-related and/or connection-descriptive information.
  • the priority indicating parameter is typically measured or collected from data holding units or databases at the network side, preferably by means of a network-based control unit, such as an RNC.
  • Some types of mobile terminals require more power from the base station than other when providing the same service in the same radio environment.
  • the type of mobile terminal can therefore be useful as priority indicator.
  • the brand or model of the mobile terminal can be used.
  • a preferred embodiment suggests that the classification of mobiles is automatized. The actual performance or power requirement of the mobile terminal is then determined at the network side and based thereon the terminal is classified, e.g. using information about the required downlink code power when connected to a specific reference cell; IMIE number; and or block error rate (for data services).
  • the automatic classification can be based on stored or measured connection-related information.
  • the subscription class si is a useful input, e.g. enabling for operators to offer gold subscriptions with better services to customers that pay more.
  • connection establishment tc is an informative input.
  • the power distribution can be based on one or more DPI related to packet features, such as packet length (longer packets are prioritized), packet type, and/or time since last packet, as well as DPI related to block error statistics and/or block retransmission statistics.
  • the power control of the invention is thus preferably performed using the above-described power control parameters p i,max , ⁇ inc,i and ⁇ i .
  • one single control parameter or, alternatively, a combination of two or all control parameters can be used for a particular power control situation.
  • the power control is effectuated through other power-related parameters, including other parameters directly or indirectly related to a power change rate of the connection-specific transmitter power.
  • a quality target of the connection can be used as power control parameter, instead of or in addition to the above parameters.
  • the quality target specifies the desired quality of a connection.
  • An example is the block error rate (BLER) quality target of WCDMA, i.e. the ratio between the number of erroneous blocks and the total number of transmitted blocks.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
US10/736,897 2003-12-17 2003-12-17 Power control method Abandoned US20050136960A1 (en)

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US10/736,897 US20050136960A1 (en) 2003-12-17 2003-12-17 Power control method
PCT/EP2004/053334 WO2005060120A1 (en) 2003-12-17 2004-12-08 Power control method
EP04804721.1A EP1698068B1 (en) 2003-12-17 2004-12-08 Power control method
CN2004800375721A CN1894866B (zh) 2003-12-17 2004-12-08 用于通信系统中的功率控制方法及设备
TW093138997A TWI382688B (zh) 2003-12-17 2004-12-15 功率控制方法
HK07107338.9A HK1102946A1 (en) 2003-12-17 2007-07-09 A method and a device for power control using in a communication system
US11/902,659 US7899484B2 (en) 2003-12-17 2007-09-24 Power control method

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US8982750B2 (en) 2009-01-16 2015-03-17 Qualcomm Incorporated Method and apparatus for transmitting overload indicator over the air
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US8660600B2 (en) * 2009-03-12 2014-02-25 Qualcomm Incorporated Over-the-air overload indicator
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US9820295B2 (en) * 2013-01-10 2017-11-14 Telefonaktiebolaget Lm Ericsson (Publ) Over-the air signaling for coordination of time-division duplexing
US9456423B2 (en) 2014-06-18 2016-09-27 Qualcomm Incorporated Automated parameter adjustment to compensate self adjusting transmit power and sensitivity level at the node B

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