uplink power control method on a wireless network base station, base station for use on a wireless n

专利摘要:
UPLINK POWER CONTROL METHOD, BASE STATION FOR USE IN A WIRELESS COMMUNICATION NETWORK AND MOBILE TERMINAL A method and apparatus provide advantageous uplink power control for a set of uplink channels transmitted by a mobile terminal or other item of user equipment (UE). The proposed uplink power control maintains the total targeted received power, while also maintaining the received signal quality for a subset of these channels - for example, a particular one of them - at or around a targeted received signal quality. In an advantageous but non-limiting embodiment of example, the subset includes a variable rate traffic channel. Correspondingly, a base station generates first power control commands to maintain the quality of signal received from the control channel to or around some quality object, and generates second power control commands to maintain the total received power (of the two channels) at or around some power target.
公开号:BR112012004869B1
申请号:R112012004869-4
申请日:2010-08-30
公开日:2021-04-20
发明作者:Gregory E. Bottomley；Stephen Grant；Mikael Höök；Yi-Pin Eric Wang
申请人:Telefonaktiebolaget Lm Ericsson (Publ)；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] The present invention generally relates to wireless communication networks, more particularly it relates to transmission power control in such networks. BACKGROUND
[002] A common power control approach in interference-limited communication systems relies on a receiver to feed back transmit power control commands to a transmitter. Commands flowing back from the receiver tell the transmitter to incrementally increase or decrease its transmit power on an ongoing basis, as needed to maintain some reception metric for the transmitter's signal as received by the receiver. Received signal quality, expressed as a signal to noise ratio (SNR) or signal to noise ratio (SINR), is a common reception metric.
[003] As with many aspects of wireless communication system operations, power control is becoming increasingly complicated with increasing data rates. For example, Wideband Code Division Multiple Access (WCDMA) was originally developed for circuit voice and moderate rate data, employing long (10 ms) Transmission Time Intervals (TTIs). Uplink transmissions always include the Dedicated Physical Control Channel (DPCCH) - which is a fixed rate control channel - thereby providing a reference for SINR-based closed-loop power control. When the UE has traffic data to send, the NodeB (a WCDMA base station) grants the UE a transmission power allocation on the Enhanced Dedicated Physical Data Channel (E-DPDCH) that is relative to the DPCCH power.
[004] Doing so is synonymous with granting a data rate to the UE for its uplink transmission, as there is a fixed table relating to the power and data rate sent to the UE at establishment. As data is transmitted, outer loop power control is employed, with the NodeB raising or lowering the target SINR value to receive the UE E-DPDCH, depending on whether block errors occur. The NodeB continues such power control to maintain a target block error rate (BLER) for the traffic data coming from the UE.
[005] The above-described approach to uplink power control is based on several assumptions that were true when WCDMA systems were first deployed. First, the SINR-based closed-loop power control approach assumes that SINR can change within a TTI, which is true when the TTI is long (10 ms) relative to the fade rate. Second, such a closed-loop power control assumes that the NodeB has sufficient excess resources (excess received power) to allow a UE to use more resources (increase its received power). Third, data rate selection based on a fixed power-rate relationship assumes that self-interference is not significant. This third assumption holds true at moderate data rates.
[006] However, WCDMA uplink has evolved to a point where these assumptions no longer hold. As for the first assumption, a shorter TTI (2 ms) was introduced so that signal quality is approximately constant across a TTI. As for the second and third guesses, data rates got high enough that self-interference is significant, even after equalization. As a result, SINR does not simply grow with signal strength S, but also depends on an orthogonality factor dependent on fading realization. Consequently, there is a channel-dependent relationship between power and bearable rate, and instability can result when the target SINR value is above the SINR ceiling.
[007] Known approaches to one or more of the above problems include adapting closed-loop power control based on a measure of S/(I+H) rather than S/(auto I + I + N) - see, for example , WO 2008/057018 (published May 15, 2008). As noted, S is signal power (received), and I is co-channel interference from own cell and signals from another cell, N is thermal noise, and "auto I" is self interference due to dispersive channels. This approach reduces instability at the expense of performance (block error rate increases). As a result, more retransmissions occur, thus increasing delay (latency).
[008] In another alternative, a series of power commands are inhibited to improve stability - see, for example, US Utility Patent Application no. 12/022,346, filed January 30, 2008. As with the power control adaptation noted above, this approach can degrade performance, thus causing more retransmissions. Yet another alternative introduces a second outer-loop power control loop so that traffic quality (SINR) and control data can only be satisfied, rather than exceeded. While this approach improves efficiency, it does not address the instability caused when SINR requirements cannot be satisfied.
[009] In another alternative, the traffic power relative to the control (traffic gain or beta factor) is adapted to maintain quality (SINR) in the control channel in addition to the SINR of the traffic channel. This is done either on the network side (based on measured quality of the control channel) or on the UE side (based on ACK/NACK feedback from the NodeB). This technique, by itself, does not solve the power instability problem, as self-interference can cause SINR targets not to be satisfied. SUMMARY
[010] In accordance with the teachings herein, a method and apparatus provide advantageous uplink power control for a set of uplink channels transmitted by a mobile terminal or other item of user equipment (UE). The proposed uplink power control maintains the total received power for the set of uplink channels at or around a target received power, while also maintaining the received signal quality for a subset of those channels - for example, a particular one. of them - at or around a target received signal quality.
[011] In an advantageous but non-limiting example embodiment, the subset includes a fixed rate control channel, and the set includes that control channel and a variable rate traffic channel. Correspondingly, a base station generates first power control commands to maintain the quality of signal received from the control channel at or around some quality target, and generates second power control commands to maintain the total received power (of the two channels) to or around some power target. In at least one such embodiment, the traffic channel data rate is adapted as needed. For example, the data rate on the traffic channel can be adjusted downwards (upwards) when the transmitting power of the control channel is high (lowered). Additionally, or alternatively, the total received power target may be temporarily raised (or violated), to allow to increase or maintain a given data rate on the traffic channel, while maintaining the received signal quality requirement for the control channel.
[012] For Wideband Code Division Multiple Access (WCDMA), the teachings herein provide one or more embodiments directed to a Dedicated Physical Control Channel (DPCCH) and an Enhanced Dedicated Physical Data Channel (E-DPDCH), as being in the set of uplink channels subject to the proposed uplink power control. One aspect of the proposal is to add a new power control loop to maintain the total received power allocated to an uplink user (S or SNR). However, because SINR (quality) is not maintained for the traffic data (E-DPDCH, variable rate service, a portion of the global signal), the UE must adapt the traffic data rate when SINR changes. The original DPCCH power control loop is still used to maintain quality (SINR) for fixed rate services (control or header, another portion of the global signal). Alternatively, the original power control loop can be replaced by a loop that adapts the fraction of power allocated to the DPCCH.
[013] A further aspect is how fee is set at grant time. At grant time, the user is normally granted a power, relative to the current DPCCH level. There is a table that gives a one-to-one relationship between granted power and rate. The new DPCCH level is assumed to be the same as the old one. The teachings here propose to decouple these in one or more embodiments, so that the rate and new level of DPCCH are signaled separately.
[014] Another aspect is how the rate is adapted when the grant is being used. Conventionally, the rate is kept the same and both the internal and external power control loops are used to maintain quality. Moving away from this convention, uplink power control as proposed here maintains the total received power, and adapts the rate (traffic) when received signal quality changes to the traffic channel. Correspondingly, one or more embodiments of the proposed uplink power control use an intelligent "walk" algorithm that lowers, maintains, or increases the rate depending on block errors, as well as commands from the new power control loop. BRIEF DESCRIPTION OF THE DRAWINGS
[015] Figure 1 is a block diagram of an embodiment of a base station in a wireless communication network, and an associated mobile terminal.
[016] Figure 2 is a diagram of a set of example uplink channels, for which the exposed uplink power control method can be used.
[017] Figure 3 is an example chart of power control applied to a first uplink channel to maintain signal quality received from that first uplink channel, while Figure 4 is an example chart of power control applied to a set of uplink channels, including the first uplink channel, to maintain a total received power of the set.
[018] Figure 5 is a logical flowchart illustrating an embodiment of an uplink power control method as taught here.
[019] Figure 6 is a block diagram illustrating an embodiment of base station processing circuits configured to implement two power control loops that in combination control the received signal quality of one or more uplink channels while controlling the total received power of a set of uplink channels that includes that one or more uplink channels.
[020] Figure 7 is a graph illustrating the effects of a known approach to uplink power control, where the total power allocation S for a traffic and control channel is changed, as needed, to maintain the SINR in both channels.
[021] Figure 8 is a graphic contrasting with Figure 7, and showing the effects of an implementation of a proposed method of uplink power control, for the same traffic and control channels as described in Figure 7.
[022] Figure 9 is a graph showing the effects of yet another embodiment of a proposed method of uplink power control, relative to traffic and control channels in question in Figures 7 and 8.
[023] Figure 10 is a diagram of a transmit Power Control (TPC) command word that may include first and second TPCs, the first and second power control loops corresponding to a base station.
[024] Figure 11 is a logical flowchart of a modal processing embodiment to a mobile terminal, in which the mobile terminal analyzes and responds to power control commands received differently, depending on whether it is operating in a first or second mode.
[025] Figure 12 is a diagram of a table of known radio carrier and corresponding initial uplink control and traffic channel power allocations.
[026] Figure 13 is a graph illustrating the effects of self-interference at high levels of transmit power of a mobile terminal that is transmitting control channels and uplink traffic.
[027] Figure 14 is a diagram of proposed initial channel power allocations, for a pair of control and traffic channels.
[028] Figure 15 is a graph of rate adaptation according to signal noise plus variable interference.
[029] Figure 16 is a block diagram of a circuit-processing base station embodiment, configured to implement uplink power to control.
[030] Figure 17 is block diagram of an embodiment of mobile terminal processing circuitry configured to respond to uplink power control commands from a base station.
[031] Figures 18 and 19 are logical flowcharts illustrating example approaches to channel rate adaptation (traffic). DETAILED DESCRIPTION
[032] Figure 1 illustrates a base station 10 that is configured for use in a wireless communication network. For example, in one or more embodiments, the base station includes a NodeB in a Broadband Code Division Multiple Access (WCDMA) network. Base station 10 is configured to provide uplink power control for mobile terminals 12. Only one mobile terminal 12 is illustrated, but those skilled in the art will appreciate that base station 10 can support a large plurality of mobile terminals 12, including the inventive uplink power control proposed here.
[033] Transceiver circuits 14 included in base station 10 illustrated allow to receive uplink signals from mobile terminals 12 and transmit downlink signals to mobile terminals 12. Base station 10 further includes one or more processing circuits 16 that are associated operatively with transceiver circuits 14, and are configured to generate first power control commands to a mobile terminal 12 calculated to maintain a received signal quality for a first uplink channel transmitted by mobile terminal 12 to a quality target. signal received. Furthermore, the processing circuitry 16 is configured to generate second power control commands to the mobile terminal 12, calculated to maintain a total power received by a set of uplink channels transmitted by the mobile terminal 12 to a target of total received power, and to transmit the first and second power control commands to the mobile terminal.
[034] As shown in Figure 2, the set uplink channels includes the first uplink channel and at least one second uplink channel, although in some embodiments, the set includes more than just the first and second link channels ascending. Correspondingly, Figures 3 and 4 present example graphs of transmission power control in progress for the first uplink channel and the set of uplink channels, respectively, as directed by the first and second power control commands generated by the station. base 10 as per the previous processing. While these graphs are not presented at any particular scale, and are not necessarily meant to describe literal waveforms, they do show the control of two simultaneous meshes from the base station of received signal quality to the first uplink channel and power ( total) received overall from the set of uplink channels. Coordinated control thus preserves received signal quality for the first uplink channel (or some subset of uplink channels), while maintaining the total received power for the global set of uplink channels.
[035] Figure 5 illustrates base station processing implementing an embodiment of the uplink power control described above. The illustrated method includes determining the total received power for first and second uplink channels transmitted by a mobile terminal 12 (Block 100). In addition, the method includes generating first transmit power control (TPC) commands to maintain the received signal quality of the first uplink channel at or around a received signal quality target (Block 102). By way of example, the received signal quality target may be a predefined or dynamically configured SINR value in dB against which the measured SINR first uplink channel, as received at the base station, is compared.
[036] The method further includes generating second TPC commands to maintain the total power received from the first and second uplink channels (Block 104). In one embodiment, for example, base station 10 is configured to measure Elevation Over Thermal (ROT) or signal to noise ratio (SNR) of UE or UE signal strength (S), which indicates the extent to which the power of signal received from the UE at base station 10 is above the thermal noise of its receiver circuits.
[037] Figure 6 illustrates an embodiment of processing circuits in base station 10, which are configured to generate power control commands corresponding to the modal operation described above. In the illustration, an uplink power controller 20 includes a signal power estimator 22, and a signal quality estimator 24, along with a generator/target information circuit 26.
[038] In operation, the generator/target information circuit 26 provides the uplink power controller with signals quality and total received power targets. Correspondingly, signal power estimator 22 provides the uplink power controller with an estimate (current or most recent) of the total power received by the set of uplink channels of interest. Similarly, the signal quality estimator 24 provides the uplink power controller with an estimate (current or most recent) of the received signal quality for a particular or subset of uplink channels in the set.
[039] The uplink power controller 20 compares the received signal quality target with the estimated signal quality, and the received full power target with the estimated total received power, and correspondingly generates first and second TPCs. In combination, these TPCs maintain the total received power of a set of uplink channels transmitted by a given mobile terminal 12 at or around a defined total received power target, while also maintaining a first uplink channel (or a subset of uplink channels) in the set at or around a defined received signal quality target.
[040] Such control is advantageous not least because, on the uplink, the received power level at base station 10 is a "shared" resource with respect to the plurality of mobile terminals 12 being supported by base station 10. That is, there is a power maximum received aggregate of all received signals that base station 10 can operate. This limit is generally expressed in terms of ROT. Typical values are 6 or 7 dB, and while interference cancellation at base station 10 may allow for higher values, there will still be a threshold due to interference from another cell that is not cancelled. On the other hand, the uplink transmission power needed by each mobile terminal 12 for effective transmission generally increases with increasing data rates. Thus, a given plurality of mobile terminals 12 are competing in some sense for larger individual allocations of the total power margin received from the base station.
[041] Consequently, resource allocation should be done in terms of received signal power S or S/N (as N noise due to thermal noise is fixed). If the S/N ratio (SNR) is maintained instead of the variable rate traffic SINR for each mobile terminal 12 or at least for those mobile terminals 12 operating at high data rates, then instability will be prevented. Also, tighter control over resource allocation will be achieved. Note that total power S for the uplink channel set in this sense is either relative to a fixed power level (eg 1 Watt) or relative to a slowly varying power level such as thermal noise (SNR).
[042] When SNR is fixed, signal quality or SINR varies. SINR can

[043] where S is the signal power, I is co-channel interference from the cell itself and signals from another cell, N is thermal noise and as is self-interference, and where a is the non-orthogonality factor (OF) (dependent of channel) instantaneous that varies between 0 (perfect orthogonality) and 1. (eg a is 0 in flat channels, not zero in dispersive channels). Also, foot the fraction of total power S allocated to a particular channel.
[044] With the foregoing in mind, those skilled in the art will appreciate that one or more embodiments of the uplink power control proposed herein provide advantageous power control for an uplink channel set that includes a fixed rate channel, by example, a control/header channel, and a variable rate channel, for example, a traffic channel. The consequence of maintaining the total received power for the set of uplink channels is, of course, the fact that the transmit power allocated to any one or more of the uplink channels in the set can be adjusted down, as needed, to avoid excessive total received power for the set at base station 10.
[045] Power variations made to maintain overall received power at base station 10 can be compensated for on variable rate channels in the pool by making corresponding adjustments to their data rates, but this approach does not work for fixed rate channels in the pool. To preserve SINR or other quality-related reception requirements on fixed rate channels, the teachings here propose SINR-based power control for such channels. As the total received power, denoted as S, for the set of uplink channels is fixed, the proposed approach involves dynamic adaptation of the split power (of the total) between two or more of the uplink channels in the set.
[046] For discussion, a fixed rate control channel and a variable rate traffic channel are used as examples of first and second uplink channels including a set of uplink channels transmitted by a mobile terminal 12 to the base station 10. Figure 7 illustrates a known conventional approach to power control. One sees that the overall received power S of the traffic and control channel signals increases, as the power of the traffic channel and the fixed rate control channel is increased, such as to compensate for dispersive (versus flat) propagation channel conditions .
[047] In contrast, Figure 8 illustrates the effects of uplink power control for the same two channels, using an uplink power control embodiment as proposed here. One sees that, under the contemplated uplink power control, the total power S does not change when channel conditions change from flat to dispersive (or back again). Instead, the power split between the traffic and control channels changes when the propagation channel goes from flat to dispersive.
[048] Particularly, the power allocation to transmit the control channel is increased, to maintain the received signal quality of that channel at the base station. Correspondingly, the power allocation for transmitting the traffic channel is decreased and a concomitant decrease in transmission data rate is performed, to compensate for the lower power allocation for the traffic channel. While such a decrease is desirable, it is possible to omit this step and allow low hybrid ARQ to handle packet errors that would otherwise occur.
[049] At a few moments of time, the full power target used by base station 10 may be too low to maintain the required received signal quality on the control channel, even if the traffic channel rate is reduced to zero and the control channel takes the entire total power allocation. Therefore, according to one or more uplink power control embodiments, the total received power target is temporarily ignored (or raised) by base station 10, as needed, to allow the transmit power used for the control channel. be increased, to maintain the target received signal quality at base station 10. Such operations are shown in Figure 9.
[050] In an embodiment of WCDMA, where the total received power limit is applied to a DPCCH and an E-DPDCH being transmitted in the uplink by a given mobile terminal 12, the processing corresponding to the power allocation/control shown in Figure 9 can be understood to mean that the E-DPDCH rate is dropped to zero, and the total received power target is ignored or temporarily raised, with all this high power allocation going to the DPCCH, to maintain the received signal quality of the DPCCH at base station 10.
[051] To achieve this advantageous uplink power control, whether listed in terms of WCDMA-based channels, as above, or more generally, in terms of first and second channels, the IO base station includes appropriately configured processing circuits . Referring back to Figure 1, the processing circuitry 16 of the illustrated base station 10 includes an uplink power controller 20, a signal power estimator 22, and a signal quality estimator 24. These processing circuitry 1 can be understood as generating power control commands for the mobile terminal 12 in accordance with the teachings presented here. Correspondingly, the mobile terminal 12 includes a transceiver circuit 30 for receiving such transmitted power control commands, and associated processing circuitry 32 for controlling the uplink transmit power of the transceiver circuits 30 in accordance with such received commands.
[052] Those skilled in the art will appreciate that the processing circuits 16 and 32 of the base station 10 and the mobile terminal 12, respectively, may be implemented in hardware, in software, or in some combination of hardware and software. For example, dedicated digital signal processing hardware can be used for certain aspects of transmit and/or reception or control signal processing, while software-based processing is used for other aspects. In either case, base station 10 constitutes a particular machine that is configured by hardware, software, or a mixture thereof, to perform the uplink power control methods proposed here. Also, the mobile terminal 12 constitutes a particular machine that is configured to operate under and in cooperation with the proposed uplink power control method.
[053] In at least one embodiment, the base station processing circuitry 16 includes at least microprocessor-based circuitry (including any required program/data memory), which is configured at least in part by executing stored program instructions for perform the proposed uplink control method. To that end, processing circuitry 16 includes or is associated with computer readable medium included in base station 10, which is configured to store one or more computer programs. Similar microprocessor-based implementations can be used in the mobile terminal 12 for mobile side processing.
[054] Regardless of the particular implementation details, the base station 10 is configured to generate first power control commands to the mobile terminal 12, which are calculated to maintain a received signal quality - e.g., SINR - for a first channel uplink transmitted by the mobile terminal 12 to a received signal quality target. The base station is further configured to generate second power control commands to the mobile terminal 12 which are calculated to maintain a total received power for a set of uplink channels transmitted by the mobile terminal to a total received power target.
[055] As noted, the set of uplink channels includes at least the first uplink channel and a second uplink channel transmitted by the mobile terminal 12. (Here, the first and second uplink channels can be understood as different physical layer channel transmissions by mobile terminal 12.) Also, as noted, base station 12 uses a defined signal quality target (static or dynamic) to evaluate the signal quality of the first uplink channel, and uses a total defined received power target (static or dynamic) for evaluating the combined received power of the first and second uplink channels (in combination with any additional channels in the set).
[056] In one or more embodiments, the first uplink channel is a control channel and the second uplink channel is a traffic channel. The traffic channel is selectively granted to mobile terminal 12 by base station 10, and, as part of granting the traffic channel to mobile terminal 12, base station 10 is configured to indicate to mobile terminal 12 a particular radio carrier to use. to transmit on the traffic channel and indicate to the mobile terminal 12 an initial allocation of transmission power for the traffic channel relative to the transmission power of the control channel.
[057] In at least one such embodiment, the mobile terminal 12 maintains a table or formula relating different traffic channel transmission power ratios for controlling different radio carriers supporting different transmission rates. Correspondingly, base station 10 is configured to indicate the particular radio carrier to be used by mobile terminal 12, signaling a table index or formula parameter. Also, base station 10 is, in at least one embodiment, configured to determine the particular radio carrier by predicting a signal quality received at base station 10 for the traffic channel as a function of power allocation and estimated self-interference associated with the traffic channel.
[058] Along with the base station's uplink power control, the mobile terminal 12 transmits the set of uplink channels using a total transmit power, and the base station 10 correspondingly controls that total power by its generation of the first and/or second power control commands. In at least one embodiment, the base station 10 is configured to generate first power control commands by generating first commands up and down, as needed, to raise or lower the transmit power used by the mobile terminal for transmitting the first. uplink channel, to maintain the received signal quality of the first uplink channel at or around the received signal quality target. In addition, base station 10 generates the second power control commands by generating second up and down commands, as needed, to raise or lower the total transmit power used by the mobile terminal to transmit the set of uplink channels, to maintain the total received power for the set of uplink channels at or around the total received power target.
[059] In the same or other embodiments, the base station 10 is configured to selectively grant the second uplink channel to the mobile terminal 12, and to selectively operate in a first mode if the second uplink channel has not been granted, and in a second mode if the second uplink channel has been granted. In the first mode, the base station 10 generates the first but not the second power control commands, and in the second mode it generates the first and second power control commands. For example, if the mobile terminal 12 is transmitting an uplink control channel but not transmitting an associated traffic channel, the base station 10 can simplify its power control by simply generating a stream of power control commands as needed. , to maintain the SINR of the control channel. By granting a traffic channel to the mobile terminal 12, the base station 10 begins to generate an additional flow of power control commands to control the total power received from the control and traffic channels.
[060] In at least one such embodiment, the base station 10 is configured to grant the second uplink channel in one of two power control modes. For example, if the grant matches a low data rate, the first mode will be used so that there is only one set of power control commands. If the grant matches a high rate, the second mode will be used. Thus, in one or more such embodiments, base station 10 is configured to grant the second uplink channel to the mobile terminal selectively, and to operate in a first mode if the second uplink channel has been granted at a low rate and at a second mode if the second uplink channel was granted at a high rate. In the first mode, the base station 10 generates the first but not the second power control commands, and in the second mode it generates the first and second power control commands.
[061] Instead of using two sets of power control commands, the set of commands corresponding to full power can be replaced with baud rate commands. More particularly, where the first uplink channel is a fixed rate control channel and the second uplink channel is a variable rate traffic channel, one embodiment of the base station 10 is configured to initiate a decrease in a rate of transmission used by the mobile terminal 12 to transmit on the variable rate traffic channel, responsive to determining that a rate dependent received signal quality target for the variable rate traffic channel is not being satisfied. Conversely, base station 10 initiates an increase in the transmission rate used by mobile terminal 12 to transmit on the variable rate traffic channel, responsive to determining that a rate-dependent received signal quality target for the variable rate traffic channel is being satisfied. Note that such commands are effectively full power commands, as a lower rate requires less power.
[062] In the same or other embodiments, the base station 10 is configured to transmit the first and second power control commands to the mobile terminal 12 by transmitting a binary Transmission Power Control (TPC) word in each of a series of slots of repeated transmissions. For example, a first subset of bits in the TPC word includes the first power control commands and a second subset of bits includes the second power control commands. Figure 10 illustrates an example TPC word, with first and second subsets of TPC bits, representing first and second power control commands to mobile terminal 12.
[063] An example of modal processing of power control command words received in mobile terminal 12 is shown in Figure 11. As illustrated, mobile terminal 12 receives commands from TPC (Block 110) and processes them differently, depending on which of the first and second modes is operating. If operating in the first mode (Yes of Block 112), processing circuits 32 control a transmit power used by mobile terminal 12 to transmit the first uplink channel in accordance with received power control commands (Block 114). Thus, in the first mode, TPCs received in a power control command word are received and interpreted as commands for the first uplink channel.
[064] However, if operating in the second mode (Not from Block 112), the processing circuits 32 analyze each received power control command (word) into first and second commands (as shown in Figure 10) (Block 116), and control the transmission powers used by the mobile terminal 12 for the first and second uplink channels in accordance with the first and second commands (Blocks 118 and 119). Furthermore, as noted with respect to making data rate adjustments in response to varying power allocations, in one or more embodiments, the mobile terminal 12 is configured to autonomously reduce a transmission rate used for transmissions on the second uplink channel, responsive to a commanded reduction in the transmit power used to transmit the second uplink channel.
[065] In one or more embodiments, base station 10 includes a CDMA base station, the first uplink channel includes a physical CDMA control channel, and the second uplink channel includes a physical CDMA data channel. which is granted selectively. In this context, the mobile terminal 12 operates in the first mode when the data channel has not been granted and operates in the second mode when the data channel has been granted. In another embodiment, the mobile terminal 12 also operates in the first mode when the data channel has been granted, but the grant data rate is low; and operates in the second mode when a high rate data channel has been granted.
[066] Correspondingly, in such embodiments, the base station 10 is configured to estimate the signal quality received by the CDMA physical control channel based on determining a received SINR for the CDMA physical control channel, and estimating the total received power for the CDMA data and physical control channels. (The estimate can be absolute (S) or relative (SNR)). For example, it can estimate a rise power over thermal noise at base station 10 that is attributable to physical control channels and CDMA data.
[067] In a Broadband CDMA embodiment of base station 10, it is configured to operate as a nodeB in a Broadband CDMA network. Here, the first uplink channel includes an uplink Dedicated Physical Control Channel (DPCCH), and the second uplink channel includes an uplink Enhanced Dedicated Physical Data Channel (E-DPDCH). Therefore, the base station 10 is configured to generate the first and second power control commands to maintain the signal quality received by the DPCCH at the received signal quality target and the total received power for the DPCCH and E-DPDCH at the target of total received power.
[068] Regardless of the particular interface/network standards adopted by base station 10 and mobile terminal 12, it will be understood that mobile terminal 12 is configured to support the proposed uplink power control. In one or more embodiments, the mobile terminal transceiver circuits 30 (as shown in Figure 1) are configured to send uplink signals to base station 10 and receive downlink signals from base station 10. In addition, its one or more circuits processors 32 are operatively associated with transceiver circuits 30 and configured to receive power control command words from base station 10 as a base control station, and, in one or more embodiments, to selectively operate in first and second modes.
[069] More broadly, the proposed uplink power control uses two power control loops: one to control the transmit power used for a first channel (or channels), to maintain received signal quality, and one to control the total transmit power for a set of channels, including the first channel (or channels), to maintain the total received power for that set of channels at or around some target of total received power. This can be understood as the base station 10 generating uplink transmit power control commands to a given mobile terminal 12, to maintain the total received power S for two or more uplink signals transmitted by that mobile terminal 12, and for keep the received SINR for one of these channels (or a particular subset).
[070] Prior control can be achieved by controlling multiple matched quantities. Using DPCCH and E-DPDCH as the example uplink channel, the base station 10 can control the total received power used for the DPCCH and E-DPDCH and the fraction of power allocated to the DPCCH, or for the E-DPDCH. Alternatively, the base station may control the power allocated to the DPCCH and to the E-DPDCH, with these controls coordinated such that the total received power is maintained. Other control arrangements are also contemplated.
[071] Using an example where base station 10 controls the total transmit power used for the DPCCH and E-DPDCH, and the amount of that total allocated to the DPCCH, those skilled in the art will appreciate that there are still several ways to implement these two control loops. One option is to use existing WCDMA transmit power control bits (TPC) in a different way. According to WCDMA standards, two or four TPC bits are sent per transmit slot to control the total transmit power. The contemplated base station 10 can be configured to use half of these bits to control the DPCCH power (for the purpose of preserving the DPCCH SINR at base station 10). Power levels of other fixed rate control channels (eg High Speed Dedicated Physical Control Channel (HS-DPCCH), Enhanced Dedicated Physical Control Channel (E-DPCCH)) can be adjusted in the same way. The other half of the TPC bits is used to control the total power, thus maintaining the desired global SNR in base station 10. Other partitions are possible.
[072] In another contemplated control option, the base station 10 "steals" Transport Format Combination Indicator (TFCI) bits when E-TFCI is used, as needed for high data rates. Also, as noted, only one power control loop is needed for the mobile terminal 12 when a traffic channel (high rate) such as E-DPDCH has not been granted. Thus, base station 10 can be configured to run a power control loop that generates TPC commands to maintain the SINR received from the mobile's DPCCH transmissions, and switch to two power control loops by granting an E-DPDCH to the mobile terminal 12. Rate Selection/Adaptation
[073] Assuming that the proposed power allocation approach is applied in maintaining a total received power for a control channel and a traffic channel, while maintaining SINR for the control channel, it will be appreciated that the SINR for the traffic data will vary with varying propagation channel conditions. As such, the teachings here further propose corresponding new approaches to rate selection and adaptation. These teachings extend to initial data rate settings, likewise to adapt the rate when SINR changes. Rate Selection at Concession Time
[074] In existing WCDMA systems, the Node B and the mobile terminal or other user equipment (UE) agree on an ETFC table at establishment. This table gives a one-to-one relationship between E-DPDCH power granted to radio carriers - that is, the table defines a direct relationship between E-DPDCH power granted, which is relative to current DPCCH power and data rate used for E-DPDCH transmission. An absolute grant is given in terms of E-DPDCH power (relative to current DPCCH), and the table is used to determine the carrier (rate). A relative grant is relative to a preceding grant, and thus can be translated into an absolute grant level.
[075] Figure 12 illustrates an E-DPDCH relative power table, also known as an E-TFC table, used in a known approach to transmit power allocation for the E-DPDCH. Table entries for three carriers (radio) are shown. The corresponding procedure is for a base station to signal a 4:1 grant, implying that a total of 5 times the current DPCCH power can be used. The UE would then use the table to determine which carrier 4 can be used. As a general proposition, the received signal quality of E-DPDCH at the base station can be maintained if the allocation of total transmit power for the DPCCH and the E-DPDCH results in a total received power S at the base station that is less than "A" in the graph shown in Figure 13. Otherwise, inter-symbol interference (ISI, self interference) becomes significant and the traffic SINRs and DPCCH are not what you would expect.
[076] According to an embodiment of the proposed uplink power control, the same E-DPDCH grant table as shown in Figure 12 can be used in the mobile terminal 12. Also, as is conventional, a grant can be made in terms of E-DPDCH power relative to DPCCH power. Typically, such a concession would point to a nominal carrier (fee). However, in accordance with one aspect of the teachings presented here, base station 10 additionally sends an absolute or relative position within the table (corresponding to a certain percentage of header and carrier). Sending this information gives a power-independent rate.
[077] For example, a 4:1 grant would imply that 5 times the current DPCCH power can be used. However, suppose there is significant ISI, which would make traffic SINR and DPCCH suffer. To remedy this, base station 10 would signal the use of carrier 2. Notably, this additional signaling changes both the rate and fraction of power allocated to DPCCH. Thus, as shown in Figure 14, carrier 2 would be used at a power level five times the original DPCCH level. Also note that the new level of DPCCH is different due to carrier-independent signaling. This combined signaling serves the goal of maintaining a global SNR for the channel pair (DPCCH and E-DPDCH), while maintaining a SINR for the DPCCH.
[078] One aspect of the above proposed approach to granting relates to a base station determining what rate to allocate. Conventionally, offline simulations were used to determine the table that gives the one-to-one relationship between granted power and rate. This approach assumes that SINR grows with S (that is, that self-interference is negligible). However, according to one or more embodiments proposed here, base station 10 predicts SINR, accounting for the self-interference that will result when the grant is used. For example, one or more embodiments of base station 10 employ a linear equalizer, such as a G-Rake receiver. Example details for G-Rake receiver operation appear in Published Patent Application WO 2005/096517 to Cairns, et al., which is commonly owned with this application.
[079] A type of G-Rake receiver uses a parametric model of received signal deterioration correlations. In particular, the deterioration correlation matrix R of a received CDMA signal can be expressed as a function of certain parameters based on the given theoretical expression.
where Ep is the pilot energy per unity time, Et is the total transmitter energy per unity time, N is the scattering factor, C is a scaling factor, No is the noise factor, RSI is a correlation matrix of interference (including autointerference), and Rn is a thermal noise correlation matrix arising from receiver filtering autocorrelation properties. Note that RSI can be constructed as an interference covariance (or correlation) matrix, and Rn can be constructed as a noise correlation matrix.
[080] Looking at (Eq. 2) above, it should be noted that a receiver generally cannot explicitly know Et/Ep, nor No. This issue can be addressed by determining the parametric model deterioration terms RSI and Rn channel coefficient e receiver pulse shape information. Those skilled in the art will appreciate that a given receiver can be configured with knowledge of its receiver filter pulse shape, for example, its filter autocorrelation function, and can maintain channel coefficient estimates based on receiving pilot symbols, data training, or other signals known a priori to the receiver such that reception of the known signal can be used to characterize the propagation channels. Exemplary formulas are given here for computing RSI and Rn in terms of channel coefficient and pulse shape information.
[081] For example, the teachings here may use a deterioration correlation model that, in an exemplary embodiment, includes an interference term that is graded by a first model fit parameter, and a noise term that is graded by a second model fit parameter. Using this method, the R deterioration correlations can be modeled as,

[082] In the previous equations
, which is a complex channel model, Rp is a pulse shape autocorrelation function, Tc is a CDMA chip period, and dk is a delay of the kth finger of G-Rake. Note also that the values of g are channel coefficients corresponding to the pilot channel, that is, channel coefficients estimated directly from a received pilot channel.
[083] Using signal processing based on the previous equations, base station 10 can predict SINR by estimating signal strength (alpha) and noise power (beta). Here, base station 10 can be configured to scale alpha to account for the increase in power when using the grant and would determine the SINR for both DPCCH and E-DPDCH. The data rate (to be fixed) for E-DPDCH would be lowered until quality requirements for DPCCH and E-DPDCH are satisfied.
[084] Still other embodiments of base station 10 do not use rate initiation prior. For example, one embodiment of base station 10 does not perform extra carrier selection signaling as described above. Skipping this signaling may result in mobile terminal 12 starting at a rate that is too high, but this initial transient condition is mitigated if there is a delay between granting a rate and the rate being used. In such embodiments, base station 10 can use the delay to send additional power up commands to mobile terminal 12 to adjust DPCCH power before mobile terminal 12 uses the grant.
[085] Thus, with reference to the table in Figure 12, base station 10 may, instead of giving a 4:1 (5x) grant, give a 2:1 (3x) grant (to acquire the correct carrier) and giving sufficient power up commands such that when the grant is used by the mobile terminal 12, it is 5x relative to the original DPCCH level (before the up commands were given). Rate Adaptation
[086] Once a rate has been selected and transmission started, base station 10 maintains resource allocation S, using power control based on SNR. However, when the propagation channel instantly becomes more or less dispersive due to fading on the different paths, the SINR of both traffic and control channels will fluctuate. (Here, and throughout this document, those skilled in the art will recognize that, unless otherwise stated or made clear from its context, the term "channel" denotes formatted signal defined within a composite signal, having multiple channeled signals. , the SINR and/or SNR of a given channel will be understood as relative to the signal received for that channel.)
[087] For control channels, base station 10 uses SINR-based power control to maintain a desired received signal quality, as described earlier. This control impacts the traffic channel SINR, which is also affected by propagation channel variations. Thus, rate adaptation is used for the traffic channel in one or more control embodiments, to compensate for the traffic channel's variable SINR, as received at base station 10.
[088] In general, the rate (block size, carrier) can be determined at base station 10, which sends corresponding commands to mobile terminal 12. Alternatively, mobile terminal 12 can be configured to perform rate adaptation, thereby avoiding extra signaling between base station 10 and mobile terminal 12.
[089] In a rate adaptation approach as performed by mobile terminal 12, one can assume that the base station power control is working correctly. In this assumption, the mobile station 12 can be configured to deduce the E-DPDCH/DPCCH ratio from the base station's SNR and SINR control loops. The mobile terminal 12 then uses this relationship to determine the corresponding rate from its E-TFC table stored in memory, and uses that rate. For example, if the DPCCH transmit power of the mobile terminal is commanded up and the global transmit power S is commanded down, the mobile terminal 12 computes a lower E-DPDCH/DPCCH ratio and correspondingly adopts a data rate lower for the E-DPDCH. Such operations assume that the table is designed correctly and everything is working fine, so that a desired block error rate (eg 10%) is achieved for the E-DPDCH at base station 10.
[090] In another embodiment, which offers more robust operation, the mobile terminal 12 is configured to monitor the occurrence of block errors in the base station 10, for example, monitoring the ACK/NACK process. If the mobile terminal 12 sees fewer errors than expected, it can be more aggressive in terms of selecting its E-DPDCH data rate and vice versa. Note that in some sense, this replaces a conventional outside loop power control that sets a SINR target for a received signal to maintain a desired BER/BLER (bit error rate/block error rate). This can be used in conjunction with the previous realization.
[091] When considering how the mobile terminal 12 can use more aggressive or conservative rates given the same E-DPDCH/DPCCH power, it is noted that the conventional E-TFC table gives a one-to-one ratio between the power and rate ratio. of E-DPDCH/DPCCH. Thus, in one embodiment, the mobile terminal 12 instead uses multiple E-TFC tables, having ratio mappings to more aggressive/less aggressive rate. For example, you can use three tables: one having an aggressive mapping, one having a moderate mapping, and one having a conservative mapping. These tables, or related data, can be signaled from base station 10 to mobile terminal 12.
[092] However, it may be desirable to avoid such signaling, and simply reuse the conventional E-TFC table in some way. In one embodiment, the mobile terminal 12 "ignores" the beta factor by adapting the rate. These beta factors normally determine the E-DPDCH/DPCCH potency ratio. Thus, by ignoring the beta factor, the mobile terminal 12 is effectively allowing the two base station control loops to determine this relationship instead. To be more aggressive, mobile terminal 12 uses a higher rate from the E-TFC table, but takes the beta settings of the two control loops. For example, the two power control loops determine the power ratio of E-DPDCH/DPCCH to be yi. According to conventional use of the E-TFC table, the mobile terminal 12 would use the corresponding rate ri (a given transport block size). However, in one or more embodiments taught here, the mobile terminal 12 is configured to apply a rate adjustment factor Δ for rate selection. As such, the mobile terminal 12 does not use the rate ri that would have been conventionally determined, but instead uses the rate ri+Δ . A positive Δ drives the rate up (aggressive), while a negative Δ drives the rate down (conservative).
[093] This is an implicit change to existing WCDMA standards and can impact base station parameter estimation algorithms if they rely on fixed power relationships between DPCCH and E-DPDCH codes. However, it is believed that the impact should be minimal, as the base station 10 can be advantageously configured to deduce the next relationships, assuming that the mobile terminal 12 has successfully received the control commands and followed them.
[094] As for determining what the new rate should be, one or more embodiments contemplated here use an intelligent "walking" algorithm to adapt the rate up when there is no erasure and down when there are erasures. Also, a "restrain" option is used to avoid jumping between too high a rate and a good rate. This procedure is an implicit change to the WCDMA standards, as the mobile terminal 12 no longer trusts base station 10 (NodeB) to fix the power control blanking problem. The overall concept is illustrated in Figure 15. One sees that the base station uplink power control is used to maintain the SNR of the DPCCH and E-DPDCH pair, while the data rate on the E-DPDCH is adapted to the SINR variable of the E-DPDCH. Use of the two base station control loop commands can also be incorporated into this scheme. For example, the approach described above involving alpha grading can be used to determine an initial change in rate by which it can be decremented, eg, 0.9, before being applied.
[095] Alternatively, as noted, base station 10 may control rate adaptation, as it generally has access to the same information as mobile terminal 12, and could use the same or a different approach to determine new rates. However, if base station 10 makes rate determinations, such determinations need to be signaled to mobile terminal 12. Approaches already described here for additional power control loop - ie, second power control commands could also be used to send additional information to the mobile terminal 12 about whether to fall, hold, or rise in rate (carrier and header partition).
[096] Furthermore, in some cases, the mobile terminal 12 may not use the full grant given for its E-DPDCH. For example, mobile terminal 12 may not use its full lease because it doesn't have enough bits to send, or because it doesn't have enough transmit power. Because the mobile terminal 12 can send Scheduling Information (SI) to the base station 10, and because that information indicates the mobile terminal's transmission buffer status and its transmission excess power, the base station 10 is aware of whether the mobile terminal 12 can make full use of a contemplated lease. Consequently, the base station 10 may formulate the grant due to the mobile terminal's buffer/power state, as informed to it by the mobile terminal's SI reports, to ensure that the grant is appropriate for that state.
[097] If, however, the information needed to make rate decisions is not available to base station 10, then mobile terminal 12 needs to determine a satisfactory power level and rate to use. Note that if there is not enough transmit power, then mobile terminal 12 is likely at the edge of the service area (cell) supported by base station 10, which corresponds to the benign linear portion of the curve in Figure 13. General Implementation
[098] As a general proposition, the uplink power control proposed here uses two closed-loop control loops: one loop controls the power of a total signal or first portion of that signal (eg, the DPCCH); the second loop controls the power of a first portion of a total signal, a second portion (eg, traffic) of that total signal, or the fraction of power allocated to either. In at least one embodiment, both loops are used to maintain the received SINR of fixed rate signals (control, header) and maintain total received power (S or SNR) of the total signal.
[099] As a further aspect, one or more embodiments of the proposed uplink power control modify the rate granting procedure by having base station 10 signal both total relative power (relative to current reference channel power) and carrier. rate (absolute or relative to reference carrier corresponding to power). Correspondingly, base station 10 and/or mobile station 12 perform rate adaptation, wherein the carrier is adapted based on block errors and the base station's power control loops.
[100] With the foregoing in mind, Figure 16 presents a more detailed block diagram for an embodiment of base station 10. Here, duplexer 40, transmission circuit 42, and receiver front end 44 will be understood to include all or part of the transceiver circuits 14 introduced in Figure 1. These circuits are configured to transmit and receive signals wirelessly using one or more antennas.
[101] In particular, duplexer 40 passes received uplink signals to receiver front end 44 to filter and mix up to baseband. For purposes of this example, a full uplink signal from a given mobile terminal 12 includes DPCCH as a first uplink channel, and E-DPDCH as a second uplink channel.
[102] In exchange, the baseband signal is provided to a parameter estimator 46, which may include the signal power estimator 22 and signal quality estimator 24 shown in Figure 1. The parameter estimator 46 estimates global SNR for the set of uplink channels received from the mobile terminal 12. In this example, the set includes DPDCH as a first uplink channel and E-DPDCH as a second uplink channel. Thus, for this example, parameter estimator 46 estimates SNR for the combination of E-DPDCH and DPCCH, as received at base station 10, and estimates SINR for the DPCCH. These parameter estimates are compared to target values to determine the control commands needed.
[103] Specifically, the illustrated control bit calculator 48 receives comparison results from comparator/differentiation circuits 50 and 52 representing the difference between the estimated SNR and the target SNR, and the estimated SINR and the target SINR. Control bit calculator 48, which may include all or part of the uplink power controller 20 shown in Figure 1, generates first and second power control commands for the two power control loops based on these comparisons. The generated power control commands are provided to the transmitter 42 for transmission to the mobile station 12.
[104] Figure 17 correspondingly provides a more detailed diagram for an embodiment of mobile terminal 12. A duplexer 60 passes the received signal to a front end of receiver 62, to filter and mix up to baseband. The baseband signal is provided to a mode controller/command demodulator 64, which demodulates the first and second power control commands, which are included in the signal received by the mobile terminal 12. These commands are sent to a transmission circuit 66 to control the uplink transmission power of the DPCCH and E-DPDCH by the mobile terminal 12. Note that a memory 68 or other storage device contains the E-TFC table or other power/carrier ratio table information, for use as described earlier here.
[105] Also note that the mobile terminal 12 can operate modally (eg, in the first or second modes described above), in accordance with the mode controller/command demodulator 64. For example, the mode controller/command demodulator 64 can be configured to process received power control command words differently (as commands for one loop, or parsed into commands for first and second loops), based on the mode of operation. The mode changes, for example, as a function of whether or not a traffic channel has been granted to mobile terminal 12.
[106] Furthermore, for power and rate allocation at grant time, the rate could be indicated as a position in the stored E-TFC table or as a position relative to the traditional position in the table. The latter would require fewer signaling bits, and base station 10 could implement this approach by signaling a relative position that is lower in rate, saving one signal bit as well. Base station 10 can also be configured to command mobile terminal 12 to adapt its E-DPDCH rate, based on SINR estimates for the E-DPDCH channel.
[107] Figure 18 illustrates an approach for determining a change in uplink rate at either base station 10 or mobile terminal 12 using block error indicators only. When a Transmit Time (TTI) interval has been demodulated, a block error indicator (BEI) is set to 0 or 1 depending on whether the TTI was successfully decoded or not. This BEI is added to a list of the most recent N block indicators using, for example, a FIFO buffer (Block 120). As an example, N equals ten (10). The number of block errors is counted (Block 122). If the count is 0 (Block 124), then the rate is increased (Block 126). If the count is 1 (Block 128), then the rate is held (Block 130). If the count is greater than 1, then the rate is lowered (Block 132). Raising and lowering the rate can be achieved by moving up and down a table of transmission formats corresponding to different rates.
[108] Figure 19 illustrates in Blocks 140-154 (pairs) an approach to determining rate change that uses both block error indications and control loop commands. In this example method, it is assumed that the two uplink power control loops run by base station 10 are DPCCH power (for SINR) and full power (for S). These two meshes and their ratio are used to determine an included E-DPDCH power. Alternatively, if the two control loops are DPCCH power and E-DPDCH power, then the E-DPDCH power command can be used directly.
[109] In general, there are many approaches to determining how to adjust the rate, similar to many approaches to adjusting a target SINR value in traditional outside loop power control. Those skilled in the art will appreciate that Figures 18 and 19 remain advantageous but not limiting examples. Furthermore, as noted earlier, the mobile terminal 12 may not have enough bits to send to use the full rate, and in such cases, in this case, the rate may be lower and possibly the overall transmit power lowered.
[110] As shown in the previous examples, the advantageous uplink power control of the present invention provides several advantages. For example, it avoids jitter and power spikes by directly controlling the received signal strength (at base station 10) of mobile terminals 12 operating at high data rates. As another example, it provides tighter control of resources, avoiding the need to sub-load base station 10 (or network as a whole), to allow for varying power requirements to maintain SINR. As a further example, it improves latency by reducing the need for data packet retransmissions by better rate selection.
[111] Thus, among other things, the present invention provides a method of improving the reliability of communications between user terminals and a base station. In at least one embodiment, the exposed approach does so by transmitting a power control command from the base station to the user terminal to control one of a total transmit power or a transmit power for a first portion of a global (total) signal. ) transmitted by the terminal. As noted, the composite signal includes, in at least one embodiment, a DPCCH and an E-DPDCH.
[112] Furthermore, the method includes transmitting a second control command from the base station to the user terminal to control one of a transmit power for a second portion of the transmitted signal, the fraction of power allocated to a first portion of the signal. transmitted, or the fraction of power allocated to a second portion of the transmitted signal. With this approach, the two commands are fixed to maintain the total power received from the user terminal and maintain the quality of the first portion of the transmitted signal.
[113] In one or more embodiments, exposed uplink control is used to maintain the quality of signal received from a control channel (or other fixed rate) received from the terminal, while maintaining a total power over the control channel in combination. with a traffic channel (or other variable rate). In this context, the method may further include placing the traffic channel rate at the time of granting the traffic channel such as by relative signaling or absolute carrier in a table, in addition to signaling power and during data transmission, such as using an algorithm rate walk either at EU or base station.
[114] However, those skilled in the art will appreciate that the foregoing examples do not limit the present invention. Indeed, the present invention is not limited by the foregoing discussion, or the accompanying drawings, and rather is limited by only the following appended claims and their legal equivalents.

权利要求:
Claims (34)
[0001]
1. Method of controlling uplink power in a base station (10) of wireless communication network, the method comprising: generating first power control commands (102) to a mobile terminal (12), calculated to maintain a received signal quality of a first uplink channel transmitted by the mobile terminal (12) to or around a received signal quality target; the method characterized by: generating second power control commands (104) to the mobile terminal (12), calculated to maintain a total received power of a set of uplink channels transmitted by the mobile terminal (12) to or to the around a total received power target, said set including at least the first uplink channel and a second uplink channel transmitted by the mobile terminal (12); and transmitting the first and second power control commands to the mobile terminal (12).
[0002]
2. Method according to claim 1, characterized in that the first uplink channel is a control channel and the second uplink channel is a traffic channel, which is selectively granted to the mobile terminal (12 ) by the base station (10), and further comprising, as part of granting the traffic channel to the mobile terminal (12), indicating to the mobile terminal (12) an initial allocation of transmission power for the traffic channel relative to the power of control channel transmission.
[0003]
3. Method according to claim 1, characterized in that the mobile terminal (12) maintains a table or formula relating different traffic channel transmission power ratios for control for different radio carriers supporting different transmission rates , and wherein the base station (10) indicates a particular radio carrier to be used by the mobile terminal (12) signaling a table index or formula parameter.
[0004]
4. Method according to claim 1, characterized in that the base station (10) determines a particular radio carrier to be used by the mobile terminal (12) predicting a received signal quality at the base station (10) for the traffic channel as a function of power allocation and estimated self-interference associated with the traffic channel.
[0005]
5. Method according to claim 1, characterized in that the mobile terminal (12) transmits the set of uplink channels using a total transmit power, and in which it generates the first power control commands (102 ) comprises generating first up and down commands, as needed, to raise or lower the transmit power used by the mobile terminal (12) to transmit the first uplink channel, to maintain the received signal quality of the first link channel ascending to or around the received signal quality target, and generating the second power control commands (104) comprises generating second commands up and down, as needed, to raise or lower the total transmit power used by the terminal. mobile (12) to transmit the set of uplink channels, or raise or lower the transmit power used by the mobile terminal (12) to transmit at least the second cable. uplink signal in the uplink channel set to maintain the total received power for the uplink channel set at or around the total received power target.
[0006]
6. Method according to claim 1, characterized in that the second uplink channel is selectively granted to the mobile terminal (12), and further comprising selectively operating the base station (10) in a first mode if the second the uplink channel was not granted, and in a second mode if the second uplink channel was granted, wherein in the first mode, the base station (10) generates the first but not the second power control commands, and in the second mode it generates the first and second power control commands.
[0007]
7. Method according to claim 1, characterized in that the second uplink channel is selectively granted to the mobile terminal (12), and further comprising selectively operating the base station (10) in a first mode if the second the uplink channel was granted at a low rate and in a second mode if the second uplink channel was granted at a high rate, where in the first mode, the base station (10) generates the first but not the second commands control and in the second mode generates the first and second power control commands.
[0008]
8. Method according to claim 1, characterized in that the first uplink channel is a fixed rate control channel and the second uplink channel is a variable rate traffic channel, and further comprising initiating a decrease in a transmission rate used by the mobile terminal (12) to transmit on the variable rate traffic channel, responsive to determining that a rate dependent received signal quality target for the variable rate traffic channel is not being satisfied , and further comprises initiating an increase in the transmission rate used by the mobile terminal (12) to transmit on the variable rate traffic channel, responsive to determining that a rate dependent received signal quality target for the variable rate traffic channel is being satisfied.
[0009]
9. Method according to claim 1, characterized in that transmitting the first and second power control commands to the mobile terminal (12) comprises transmitting a binary Transmission Power Control word in each of a series of repeated transmit slots, wherein a first subset of bits comprises the first power control commands, and a second subset of bits comprises the second power control commands.
[0010]
10. The method of claim 1, wherein the first uplink channel comprises a physical CDMA control channel, and the second uplink channel comprises a physical CDMA data channel, and further comprising estimating the received signal quality for the CDMA physical control channel based on determining a received signal to noise plus interference ratio for the CDMA physical control channel, and estimating the total received power for the CDMA physical control and data channels.
[0011]
11. Base station (10) for use in a wireless communication network, said base station (10) configured to provide uplink power control for mobile terminals (12) and comprising: transceiver circuits (14) for receiving signals from uplink mobile terminals (12) and transmit downlink signals to mobile terminals (12); and one or more processing circuits (16) operatively associated with the transceiver circuits (14) and configured to: generate first power control commands to a mobile terminal (12) calculated to maintain a received signal quality for a first channel. uplink transmitted by the mobile terminal (12) to a received signal quality target; and characterized in that it is further configured to: generate second power control commands for the mobile terminal (12) calculated to maintain a total received power for a set of uplink channels transmitted by the mobile terminal (12) to a target of total received power, said set including at least the first uplink channel and a second uplink channel transmitted by the mobile terminal (12); and transmitting the first and second power control commands to the mobile terminal (12).
[0012]
12. Base station (10) according to claim 11, characterized in that the first uplink channel is a control channel and the second uplink channel is a traffic channel, which is selectively granted to the terminal mobile (12) by the base station (10), and wherein, as part of granting the traffic channel to the mobile terminal (12), the base station (10) is configured to indicate to the mobile terminal (12) a radio carrier particular to be used to transmit on the traffic channel and indicate to the mobile terminal (12) an initial allocation of transmission power for the traffic channel relative to the transmission power of the control channel.
[0013]
13. Base station (10) according to claim 11, characterized in that the mobile terminal (12) maintains a table or formula relating different traffic channel transmission power ratios for control to different radio carriers supporting different baud rates, and wherein the base station (10) is configured to indicate the particular radio carrier to be used by the mobile terminal (12) signaling a table index or formula parameter.
[0014]
14. Base station (10) according to claim 11, characterized in that the base station (10) is configured to determine the particular radio carrier predicting a received signal quality at the base station (10) for the channel of traffic as a function of power allocation and estimated self-interference associated with the traffic channel.
[0015]
15. Base station (10) according to claim 11, characterized in that the mobile terminal (12) transmits the set of uplink channels using a total transmission power, and wherein the base station (10) is configured to generate first power control commands by generating first up and down commands, as needed, to raise or lower the transmit power used by the mobile terminal (12) for transmitting the first uplink channel, to maintain the received signal quality from the first uplink channel at or around the received signal quality target, and the base station (10) is configured to generate the second power control commands by generating second up and down commands, such as needed, to raise or lower the total transmit power used by the mobile terminal (12) to transmit the set of uplink channels, to maintain the total received power for the set. of uplink channels to or around the total received power target.
[0016]
16. The base station (10) according to claim 11, characterized in that the base station (10) is configured to selectively grant the second uplink channel to the mobile terminal (12), and to selectively operate in a first mode if the second uplink channel was not granted, and in a second mode if the second uplink channel was granted, and in which in the first mode, the base station (10) generates the first but not the second commands. power control, and in the second mode it generates the first and second power control commands.
[0017]
17. Base station according to claim 11, characterized in that the base station (10) is configured to selectively grant the second uplink channel to the mobile terminal (12), and operate in a first mode if the second the uplink channel was granted at a low rate and in a second mode if the second uplink channel was granted at a high rate, where in the first mode, the base station (10) generates the first but not the second commands power control, and in the second mode it generates the first and second power control commands.
[0018]
18. Base station (10) according to claim 11, characterized in that the first uplink channel is a fixed rate control channel and the second uplink channel is a variable rate traffic channel, and wherein the base station (10) is configured to initiate a decrease in a transmission rate used by the mobile terminal (12) to transmit on the variable rate traffic channel, responsive to determining that a received signal quality target is dependent on rate for the variable rate traffic channel is not being satisfied, and the base station (10) is configured to initiate an increase in the transmission rate used by the mobile terminal (12) to transmit on the variable rate traffic channel, responsive to determine that a rate-dependent received signal quality target for the variable rate traffic channel is being satisfied.
[0019]
19. Base station (10) according to claim 11, characterized in that the base station (10) is configured to transmit the first and second power control commands to the mobile terminal (12) transmitting a Control word of binary Transmit Power in each of a series of repeated transmit slots, wherein a first subset of bits comprises the first power control commands, and a second subset of bits comprises the second power control commands.
[0020]
20. The base station (10) according to claim 11, characterized in that the base station (10) comprises a CDMA base station, and wherein the first uplink channel comprises a physical CDMA control channel , and the second uplink channel comprises a CDMA physical data channel, and wherein the base station (10) is configured to estimate the received signal quality for the CDMA physical control channel based on determining a signal to noise ratio. more interference received for the CDMA physical control channel, and estimate the total received power for the CDMA physical control and data channels.
[0021]
21. The base station (10) according to claim 11, characterized in that the base station (10) comprises a Broadband CDMA base station configured for operation as a NodeB in a Broadband CDMA network, and wherein the first uplink channel comprises an uplink Dedicated Physical Control Channel (DPCCH), and wherein the second uplink channel comprises an uplink Dedicated Physical Data Channel (DPDCH), and wherein the base station (10) is configured to generate the first and second power control commands to maintain the received signal quality for the DPCCH in the received signal quality target and the total received power for the DPCCH and DPDCH in the received power target total.
[0022]
22. Base station (10) according to claim 11, characterized in that the base station (10) is configured to control rate adaptation and send information to the mobile terminal (12) about the fall, maintenance or rise in the rate is based on observed blanks on the uplink traffic channel at base station (10).
[0023]
23. Base station (10), according to claim 11, characterized in that the base station (10) is configured to signal the mobile station multiple tables that have more ratio mappings for more aggressive/less aggressive rate, said tables referring to different traffic channel transmit power ratios for control for different radio carriers supporting different baud rates.
[0024]
24. A method of uplink power control in a mobile terminal (12), the method comprising: receiving power control command words from a controller base station (10); selectively operate in first and second modes; if operating in the first mode, controlling a transmit power used by the mobile terminal (12) to transmit the first uplink channel in accordance with received power control commands; the method characterized by the fact that: if operating in the second mode, analyze each power control command received in the first and second commands, and control the transmission powers used by the mobile terminal (12) for the first and second uplink channels according to the first and second commands.
[0025]
25. The method of claim 24, further comprising autonomously reducing a transmission rate used for transmissions on the second uplink channel, responsive to a commanded reduction in the transmission power used to transmit the second uplink channel. uplink.
[0026]
26. Method according to claim 24, characterized in that it further comprises selecting the first mode of operation if the second uplink channel has not been granted to the mobile terminal (12), and selecting the second mode of operation if the second uplink channel has been granted to the mobile terminal (12).
[0027]
27. Method according to claim 26, characterized in that the first uplink channel is an uplink control channel for uplink control signaling and the second uplink channel is a traffic channel. uplink for high rate uplink data transmission.
[0028]
28. Mobile terminal (12) comprising: transceiver circuitry (30) for sending uplink signals to a base station (10) and receiving downlink signals from a base station (10); and one or more processing circuitry (32) operatively associated with the transceiver circuitry (30) and configured to: receive power control command words from a controller base station (10); selectively operate in first and second modes; if operating in the first mode, controlling a transmit power used by the mobile terminal (12) to transmit the first uplink channel in accordance with received power control commands; and characterized in that it is further configured to: if operating in the second mode, analyze each power control command received in the first and second commands, and control the transmission powers used by the mobile terminal (12) for the first and second channels uplink according to the first and second commands.
[0029]
29. Mobile terminal (12), according to claim 28, characterized in that the mobile terminal (12) is configured to autonomously reduce a transmission rate used for transmissions on the second uplink channel, responsive to a commanded reduction in the transmit power used to transmit the second uplink channel.
[0030]
30. Mobile terminal (12), according to claim 28, characterized in that the mobile terminal (12) is configured to select the first mode of operation if the second uplink channel has not been granted to the mobile terminal (12 ), and select the second mode of operation if the second uplink channel has been granted to the mobile terminal (12).
[0031]
31. Mobile terminal (12) according to claim 30, characterized in that the first uplink channel is an uplink control channel for uplink control signaling and the second uplink channel is a uplink traffic channel for high rate uplink data transmission.
[0032]
32. Mobile terminal (12) according to claim 28, characterized in that the first uplink channel is an uplink control channel for uplink control signaling and the second uplink channel is a uplink traffic channel for high rate uplink data transmission, and wherein the mobile terminal (12) is configured to use a smart walking algorithm to adapt the rate on the uplink traffic channel, along with responding to received power control commands, said smart walking algorithm configured to adapt the rate up when there is no blanking in the uplink traffic channel at the base station (10) and down when there are blanks in the uplink traffic channel uplink at the base station (10).
[0033]
33. Mobile terminal (12), according to claim 28, characterized in that the mobile terminal (12) is configured to use multiple tables that have more ratio mappings for more aggressive/less aggressive rate, said tables referring to to different traffic channel transmit power ratios for control for different radio carriers supporting different transmission rates and signaled from the base station (10) to the mobile station.
[0034]
34. Mobile terminal (12), according to claim 28, characterized in that the mobile terminal (12) is configured to receive information from the base station (10) about the drop, maintenance or rise in rate.

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法律状态:
2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-02-04| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-02-18| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 52/08 , H04W 52/24 , H04W 52/14 , H04W 52/28 , H04W 52/20 , H04W 52/26 , H04W 52/32 Ipc: H04W 52/08 (2009.01), H04W 52/14 (2009.01), H04W 5 |

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2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-04-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 20/04/2021, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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