CN101174858A - Power control method and power controller - Google Patents
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Abstract
The present invention discloses a power control method comprising that: A. a special channel is arranged in the physical channel as the basic channel; B. the power of the basic channel is controlled and then the power value is obtained; C. based on the power value obtained in the step B, the powers of other channels in the physical channel are regulated. The method provided by the present invention realizes a complete power control plan in physical channel of HSUPA. In addition, the present invention also provides a power control device. With the method and the device provided by the present invention for power control, the special channel which has a large data flow is taken as the basic channel and the feedback efficiency of power control is promoted, the power control function is ensure; moreover, the use of HSUPA technology is guaranteed.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a power control method and a power control apparatus.
Background
The high speed packet uplink data access (HSUPA) technology, as a sister technology of the high speed packet downlink access (HSDPA), makes the capability of the Universal Mobile Telecommunications System (UMTS) in data transmission more powerful and sophisticated. HSUPA can carry DVD quality video streams, conference calls, real-time games, music, e-mail and multimedia messages, etc. applications, and compared to Dedicated Channels (DCH), HSUPA can achieve higher user throughput. Meanwhile, the HSUPA can provide differentiated services more conveniently, users with different priorities can obtain different service qualities, and users with high priorities can be allocated with higher bandwidth and more resources to enjoy better services.
In UMTS, power control plays a very important role in power consumption, system capacity, inter-cell interference suppression and reduction of near-far effects. However, in the existing HSUPA technology, there is no complete power control technology for the physical channels in HSUPA. This makes the HSUPA technology not well applicable and affects the usability of the HSUPA technology.
Disclosure of Invention
In view of the above, the present invention is directed to a power control method, which can perform complete power control on a physical channel in HSUPA technology.
In addition, another main object of the present invention is to provide a power control apparatus, which can perform complete power control on a physical channel in HSUPA technology.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of power control, comprising:
A. setting a dedicated channel in the physical channels as a reference channel;
B. performing power control on the reference channel to obtain a power value after the power control of the reference channel;
C. and B, adjusting the power of other channels in the physical channel according to the power value obtained in the step B.
Preferably, in step B, open loop power control is performed on the reference channel.
Preferably, in step B, closed loop power control is performed on the reference channel.
Preferably, the method further comprises: setting an SIR target value;
wherein, the performing closed-loop power control on the reference channel to obtain the power value after power control includes:
the receiving end of the reference channel measures the signal-to-noise ratio (SIR) of the reference channel, compares the current SIR with a set SIR target value, and sends a reduction instruction to the sending end of the reference channel when the obtained SIR is larger than the SIR target value, and the sending end reduces the transmitting power of the reference channel by one Step length according to the reduction instruction to obtain a power value after power control; and when the obtained SIR is smaller than the SIR target value, sending an increase instruction to a sending end of the reference channel, and increasing the transmitting power of the reference channel by one Step length Step by the sending end according to the increase instruction to obtain a power value after power control.
Preferably, the method further comprises setting a standard error frame rate;
estimating data transmitted in the reference channel by a receiving end of the reference channel to obtain an error frame rate, comparing the obtained error frame rate with a standard error frame rate, and increasing the SIR target value when the obtained error frame rate is greater than the standard error frame rate; and when the obtained error frame rate is less than the standard error frame rate, reducing the SIR target value.
Preferably, a dedicated channel in a physical channel opposite to the direction of the reference channel is set as a reverse reference channel, and the power control command TPC symbol of the reverse reference channel carries the decrease indication or the increase indication.
Preferably, the reference channel is an enhanced hybrid automatic repeat request indicator channel E-HICH for carrying acknowledgement/non-acknowledgement ACK/NACK responses of all uplink hybrid automatic repeat request HARQ processes of the UE;
in step C, the adjusting of the power of the other channels in the physical channel is adjusting the power of the other channels in the downlink physical channel.
Preferably, the downlink physical channel includes an enhanced absolute grant channel E-AGCH; in the step C, the step C is carried out,
the power of the E-AGCH channel is adjusted as follows: and adding the power value of the E-HICH channel after the power control to the power offset between the E-HICH channel and the E-AGCH channel to obtain the power of the E-AGCH channel after the adjustment.
Preferably, the downlink physical channel includes a downlink dedicated physical channel DPCH; in step C, the adjusting the power of other channels in the downlink physical channel includes: adjusting the power of a downlink DPCH channel;
the adjusting the power of the downlink DPCH channel is: adding the power value of the E-HICH channel after power control to the power offset and beta between the E-HICH channel and the downlink DPCH channelDPCH，TFCIAnd gammaSFObtaining the adjusted power of the E-HICH channel;
wherein, betaDPCH，TFCIA gain factor corresponding to a transmission format selected by the downlink DPCH; gamma raySFAnd the spreading factor corresponds to a gain factor.
Preferably, the reference channel is a non-scheduling E-PUCH channel; in step C, the adjusting of the power of the other channels in the physical channel is adjusting the power of the other channels in the uplink physical channel.
Preferably, the uplink physical channel includes: scheduling the E-PUCH channel; in the step C, the step C is carried out,
the adjusting the power of the scheduled E-PUCH channel comprises: adding beta to the power value of the non-scheduling E-PUCH channel after power controlE-TFCI、γSFAnd KE-PUCHObtaining scheduling E-PUCH informationPower after lane adjustment;
wherein, betaE-TFCIThe gain index is normalized relative to the reference power of a scheduling E-PUCH channel after selecting a transport format combination indicator E-TFCI, a distributed scheduling E-PUCH physical resource and a modulation type; gamma raySFIs the gain factor corresponding to the selected spreading factor; kE-PUCHIs a scheduling E-PUCH channel constant configured by the network side.
Preferably, the uplink physical channel comprises an E-RUCCH channel; in the step C, the step C is carried out,
the power of the E-RUCCH is adjusted to be as follows: and adding the power value of the non-scheduling E-PUCH channel after power control to the power offset between the E-RUCCH channel and the non-scheduling E-PUCH channel to obtain the power of the E-RUCCH channel after adjustment.
Preferably, the reference channels are: an uplink DPCH channel; in step C, the adjusting the power of other channels in the physical channel is: and adjusting the power of other channels in the uplink physical channel.
Preferably, the uplink physical channel comprises a scheduling E-PUCH channel; in the step C, the step C is carried out,
the adjusting the power of the scheduled E-PUCH channel comprises: adding the power value of the uplink DPCH channel after power control to the power offset and beta between the uplink DPCH channel and the scheduling E-PUCH channelE-TFCI、γSFAnd KE-PUCHObtaining the adjusted power of the scheduling E-PUCH channel;
wherein, betaE-TFCIThe gain index is normalized relative to the reference power of a scheduling E-PUCH channel after selecting E-TFCI, allocated physical resources of the scheduling E-PUCH and a modulation type; gamma raySFIs the gain factor corresponding to the selected spreading factor; kE-PUCHIs a scheduling E-PUCH channel constant configured by the network side.
Preferably, the uplink physical channel comprises an E-RUCCH channel; in the step C, the step C is carried out,
the power of the E-RUCCH is adjusted to be as follows: and adding the power value of the uplink DPCH channel after the power control to the power offset between the E-RUCCH channel and the uplink DPCH channel to obtain the power of the E-RUCCH channel after the adjustment.
The present invention also provides a power control apparatus, comprising:
the power control unit is used for carrying out power control on a reference channel which is a dedicated channel in the physical channel to obtain a power value of the reference channel after the power control;
and the power adjusting unit is used for adjusting the power of other channels in the physical channel according to the power value of the reference channel obtained by the power control unit.
Preferably, the power control unit includes:
the power monitoring unit is used for determining whether the power of the reference channel needs to be adjusted or not, and sending a power control instruction to the power acquisition unit when the power needs to be adjusted;
and the power acquisition unit is used for acquiring the adjusted power according to the power control instruction of the power monitoring unit.
Preferably, the apparatus further comprises:
a reference channel transmitting unit for transmitting data on a reference channel;
a reference channel receiving unit for receiving data on a reference channel;
wherein,
the power monitoring unit is used for measuring and obtaining SIR according to data received by the reference channel, comparing the obtained SIR with an SIR target value and sending a power control instruction for reducing or increasing the reference channel to the power acquisition unit;
the power acquisition unit is used for acquiring the adjusted power according to the power control instruction of the power monitoring unit; and controlling the transmitting power of the reference channel transmitting unit according to the adjusted power.
Preferably, the apparatus further comprises:
the reverse reference channel transmitting unit is used for carrying a power control instruction sent by the power monitoring unit to the power acquiring unit when sending data to the reverse reference channel receiving unit;
and the reverse reference channel receiving unit is used for receiving the power control indication carried by the reverse reference channel transmitting unit when transmitting the data and transmitting the power control indication to the power acquiring unit.
The invention provides a power control method, which sets a special channel in a physical channel as a reference channel; performing power control on the reference channel to obtain a power value after the power control of the reference channel; and then according to the said power value obtained, adjust the power of other signal channels in the physical channel, therefore has realized the complete power control scheme of physical channel in HSUPA. In addition, the invention also provides a device for controlling power. In the method and the device for power control provided by the invention, the dedicated channel with larger data flow is used as the reference channel, so the feedback efficiency of power control is improved, the power control performance is ensured, and the use of HSUPA technology is promoted.
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The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates by describing in detail exemplary embodiments thereof with reference to the attached drawings, wherein:
FIG. 1 is a block diagram of a power control apparatus according to the present invention;
FIG. 2 is a flow chart of a method according to a preferred embodiment of the present invention;
FIG. 3 is a diagram illustrating an E-PUCH timeslot structure in accordance with a preferred embodiment of the present invention;
FIG. 4 is a diagram of the E-HICH timeslot structure in accordance with a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of an apparatus according to a preferred embodiment of the present invention.
Detailed Description
In the power control method of the invention, a dedicated channel in a physical channel is set as a reference channel; performing power control on the reference channel to obtain a power value after the power control of the reference channel; and adjusting the power of other channels in the physical channel according to the power value of the obtained reference channel.
In the invention, the set reference channel can be a special channel in the downlink physical channel, which is called as a downlink reference channel, and the other channels in the downlink physical channel are adjusted by using the power value of the downlink reference channel after power control; in addition, a dedicated channel in the uplink physical channel may be set as a reference channel, referred to as an uplink reference channel, and the other channels in the uplink physical channel may be adjusted by using the power value of the uplink reference channel after power control.
Preferably, the downlink reference channel and the uplink reference channel may also be set simultaneously, and used to adjust other channels in the downlink physical channel and other channels in the uplink physical channel, respectively.
Here, the method of power controlling the reference channel may be closed loop power control, or open loop power control, or other power control methods.
In the invention, the power change of the reference channel is equal to the power change of other channels in the physical channel, so that the power of other channels in the physical channel can be adjusted according to the power value of the reference channel obtained after power control and according to the power offset or other corresponding relations between the reference channel and other channels in the physical channel.
The power offset between the channels herein refers to the difference between the reference transmission powers of the two physical channels initially set by the network side.
In the invention, the downlink reference channel can be an enhanced hybrid automatic repeat request indicator channel (E-HICH) for bearing acknowledgement/non-acknowledgement (ACK/NACK) responses of all uplink hybrid automatic repeat request (HARQ) processes of a user terminal (UE) or a downlink Dedicated Physical Channel (DPCH) allocated for the user; the uplink reference channel may be an unscheduled enhanced physical uplink channel (E-PUCH) or an uplink DPCH channel allocated for the UE.
In addition, the present invention also provides a power control apparatus, the structure of which is shown in fig. 1, including: a power control unit 10 and a power adjustment unit 11. The power control unit 10 performs power control on a reference channel, which is a dedicated channel in the physical channel, and obtains a power value of the reference channel after the power control. The power adjusting unit 11 adjusts the power of other channels in the physical channel according to the power value of the reference channel obtained by the power control unit 10.
The power control unit 10 may perform open-loop power control on the reference channel and obtain an adjusted power value.
In the power control unit 10, the following may be further included: a power monitoring unit 101 and a power acquisition unit 102. The power monitoring unit 101 determines whether the power of the reference channel needs to be adjusted, and sends a power control instruction to the power obtaining unit 102 when the power needs to be adjusted; the power obtaining unit 102 obtains the adjusted power according to the power control instruction of the power monitoring unit 101.
The power monitoring unit, the power obtaining unit and the power adjusting unit can be used as a downlink power monitoring unit, a downlink power obtaining unit and a downlink power adjusting unit and are used for adjusting other channels in the downlink physical channel according to the power value of the downlink reference channel after power control; the uplink power control unit may also be used as an uplink power monitoring unit, an uplink power obtaining unit, and an uplink power adjusting unit, and adjust other channels in the uplink physical channel according to the power value of the uplink reference channel after power control.
Obviously, the power control apparatus in the present invention may include the downlink power monitoring unit, the downlink power obtaining unit, and the downlink power adjusting unit, as well as the uplink power monitoring unit, the uplink power obtaining unit, and the uplink power adjusting unit, so as to adjust other channels in the corresponding uplink/downlink physical channels according to the power value after the power control is performed on the uplink/downlink reference channel.
Fig. 2 is a flowchart of a preferred embodiment of the present invention, which describes a method for performing power control on an uplink/downlink physical channel by using a closed-loop power control technique, with an E-HICH channel carrying ACK/NACK responses of all uplink HARQ processes of a UE as a downlink reference channel and a non-scheduled E-PUCH channel as an uplink reference channel.
In the preferred embodiment, assume that the communication between the base station and the UE starts with the base station sending data through the E-HICH channel, and the primary closed loop power control of the E-HICH channel and the non-scheduled E-PUCH channel is taken as an example to describe the method of uplink/downlink power control. The specific process of the preferred embodiment is shown in fig. 2:
step 201: and the base station sends data through the E-HICH channel according to the preset reference power transmitted by the E-HICH channel at the network side.
Step 202: the UE receives data sent by the base station from the E-HICH channel and measures the signal-to-noise ratio of the E-HICH channel at the moment.
Step 203: the UE compares the signal-to-interference ratio (SIR) measured in step 202 with a SIR target value preset by the network side to obtain a power adjustment indication of the E-HICH channel.
For example, when the measured SIR is greater than the SIR target value, it is instructed to decrease the transmission power of the E-HICH channel; when the measured SIR is equal to the SIR target value, no processing is carried out; and when the measured SIR is smaller than the SIR target value, the transmission power of the E-HICH channel is instructed to be increased.
Step 204: when the UE needs to transmit data through the non-scheduled E-PUCH channel, the value of a power control command (TPC) symbol therein is set according to the indication in step 203, and the data with the set TPC symbol is transmitted through the non-scheduled E-PUCH channel.
For example, if the transmission power of the E-HICH channel is reduced, the TPC value is set to be down; and if the instruction is to improve the transmission power of the E-HICH channel, setting the TPC value to up.
Step 205: and the base station measures the SIR of the non-scheduling E-PUCH channel, and compares the SIR with an SIR target value preset by the network side to obtain the power adjustment indication of the non-scheduling E-PUCH channel.
When the measured SIR is larger than the SIR target value, the sending power of the non-scheduling E-PUCH channel is reduced; when the measured SIR is equal to the SIR target value, no processing is carried out; and when the measured SIR is smaller than the SIR target value, indicating that the transmission power of the non-scheduling E-PUCH channel is increased.
Here, the SIR target value used for the non-scheduled E-PUCH channel may or may not be the same as the SIR target value used for the E-HICH channel.
Step 206: and the base station receives data sent by the UE from the non-scheduling E-PUCH channel, obtains the value of the TPC symbol in the data, and adjusts the next transmission power of the E-HICH channel according to the value of the TPC symbol.
For example, when the TPC symbol value is down, the base station decreases by one Step (Step) based on the transmission power of the E-HICH channel at this time, that is, based on Step 201, obtains the transmission power of the E-HICH channel at the next time; when the TPC symbol value is up, the base station adds a Step on the basis of the transmitting power of the E-HICH channel at the current time to obtain the transmitting power of the E-HICH channel at the next time.
Here, Step is a value of power that is set in advance on the network side and needs to be lowered or raised in accordance with the value of the TPC symbol.
Here, step 206 may also be performed before step 205.
Step 207: the base station adjusts other channels in the downlink physical channel according to the power value of the E-HICH channel adjusted in step 206.
When an enhanced absolute grant (E-AGCH) channel of a downlink physical channel in the same transmission period needs to be adjusted, the transmission power of the adjusted E-AGCH channel is:
PE-HICH+ΔEAGCH-EHICH；
wherein, PE-HICHThe adjusted power value of the E-HICH channel is obtained; deltaEAGCH-EHICHIs the power offset between the E-HICH channel and the E-AGCH channel, namely the difference value between the reference transmission power of the E-HICH channel and the reference transmission power of the E-AGCH channel set by the network side. And when the power adjustment value of the E-AGCH channel is obtained, the power adjustment value of the E-AGCH channel can be used for transmitting in the same transmission period as the E-HICH, so that the power control of the E-AGCH channel is realized.
Step 208: when the base station needs to send data through the E-HICH channel again, the TPC symbol in the current data to be sent is set according to the power control indication obtained in step 205, and the current data to be sent is sent through the E-HICH channel according to the adjusted transmission power of the E-HICH channel in this time obtained in step 206.
When the instruction is to reduce the sending power of the non-scheduling E-PUCH channel, setting the TPC value as down; and when the transmission power of the non-scheduling E-PUCH channel is increased, setting the TPC value as up.
Step 209: and the UE receives the data sent by the base station from the E-HICH channel, obtains the value of the TPC symbol in the data, and adjusts the next transmission power of the non-scheduling E-PUCH channel according to the value of the TPC symbol.
For example, when the TPC symbol value is down, the UE decreases by one Step (Step) based on the transmission power of the current non-scheduled E-PUCH channel, that is, based on Step 204, obtains the transmission power of the next non-scheduled E-PUCH channel; and when the TPC symbol value is up, the base station adds a Step on the basis of the transmitting power of the non-scheduling E-PUCH channel at this time to obtain the transmitting power of the non-scheduling E-PUCH channel at the next time.
Here, Step is a value of power that is set in advance on the network side and needs to be lowered or raised in accordance with the value of the TPC symbol. The Step for adjusting the transmission power of the non-scheduled E-PUCH channel and the generation power of the E-HICH channel can be the same or different.
Step 210: and the UE adjusts other channels in the uplink physical channel according to the power value of the non-scheduled E-PUCH channel adjusted in step 209.
When the scheduling E-PUCH channel and the enhanced random uplink control signaling (E-URCCH) channel in the uplink physical channel need to be adjusted, the specific method is as follows.
The adjusted value of the scheduling E-PUCH channel is as follows:
Pnschd，ebase+βE-TFCI+γSF+KE-PUCH；
wherein, Pnschd，ebaseFor the adjusted power value, beta, of the unscheduled E-PUCH channelE-TFCIIs a gain index normalized with respect to a reference power of a scheduling E-PUCH channel after selecting a transport format combination indicator (E-TFCI), an allocated E-PUCH physical resource and a modulation type; gamma raySFIs the gain factor corresponding to the selected spreading factor; kE-PUCHIs a constant related to the QoS of the MAC-d flows mapped onto the E-DCH, configured by higher layer signaling. Because the reference power values of the non-scheduling E-PUCH channel and the scheduling E-PUCH channel are the same, the power value adjusted by the scheduling E-PUCH channel can be obtained by adding some factors to the power value adjusted by the non-scheduling E-PUCH channel.
The adjusted value of the E-URCCH channel is as follows:
Pnschd，ebase+ΔE-RUCCH-nschd；
wherein, Pnschd，ebaseThe adjusted power value of the non-scheduling E-PUCH channel is obtained; deltaE-RUCCH-nschdIs E-RUCCHPower offset between the channel and the non-scheduled E-PUCH channel.
Step 211: and when the UE needs to send data through the non-scheduled E-PUCH channel again, sending the data through the non-scheduled E-PUCH channel according to the adjusted transmission power of the non-scheduled E-PUCH channel obtained in step 209.
To this end, in the preferred embodiment, the E-HICH channel is used as the downlink reference channel, and the non-scheduled E-PUCH channel is used as the uplink reference channel, thereby implementing primary power control of the physical channel in the HSUPA technology.
In the preferred embodiment, since power control is described once, when the UE receives data transmitted through the E-HICH channel again, no measurement of the snr of the E-HICH channel is performed.
In practical application, when the UE receives data sent by the E-HICH channel each time, the signal-to-noise ratio of the E-HICH channel is measured, a corresponding power control instruction is returned to the base station, and the transmitting power of the next non-scheduling E-PUCH channel is adjusted according to the instruction of the base station; the same as UE, when the base station receives the data sent by the non-scheduling E-PUCH channel each time, the base station needs to measure the signal to noise ratio of the non-scheduling E-PUCH channel, returns a corresponding power control instruction to the UE, and adjusts the transmitting power of the next E-HICH channel according to the instruction of the UE.
In order to achieve better power control effect, if no data is transmitted on the non-scheduled E-PUCH channel, no data needs to be transmitted on the scheduled E-PUCH channel according to the scheduling and non-scheduling interoperation criteria, and then the non-scheduled E-PUCH channel can enter a Discontinuous Transmission (DTX) mode. Likewise, the E-HICH channel will also enter DTX mode if no ACK/NACK for any scheduled and non-scheduled processes needs to be delivered. Because the closed-loop power control is obtained according to the signal-to-noise ratio measurement of the physical channel, frequent data interaction exists in the channel, the feedback efficiency of the power control can be improved, and the performance of the power control can be improved.
Meanwhile, in order to further ensure the convergence and performance of power control, preferably, when the base station does not allocate the scheduling resource of the E-PUCH channel to the UE, and at this time, no non-scheduled E-PUCH channel data needs to be transmitted, the scheduled data block/process may be transmitted on the non-scheduled E-PUCH channel. Therefore, the using frequency of the non-scheduling E-PUCH channel is ensured, the feedback frequency of the information is improved, and the performance of power control is maintained.
When the network side additionally configures a dedicated channel for uplink/downlink, the power control of the additionally configured dedicated channel is performed independently.
In addition, preferably, on the non-scheduled E-PUCH channel slot structure, the TPC symbol field appears on the right side of the non-scheduled E-PUCH preamble, as shown in fig. 3 in particular; and the TPC symbol and the SS command of the synchronization timing for adjusting the non-scheduled E-PUCH reference power are carried in the E-HICH channel, and the TPC and SS fields appear on the right side of the E-HICH preamble, and occupy 4 bits, as shown in fig. 4.
In the preferred embodiment, the SIR target value may also be adjusted, for example, by setting a standard error frame rate; the UE estimates data transmitted in a downlink reference channel to obtain an error frame rate, compares the obtained error frame rate with a standard error frame rate, and increases the SIR target value when the obtained error frame rate is greater than the standard error frame rate; and when the obtained error frame rate is less than the standard error frame rate, reducing the SIR target value.
For example, since the E-DCH data block is carried on the non-scheduled E-PUCH channel and Cyclic Redundancy Check (CRC) protection is performed on the E-DCH data block, the base station may compare the statistical result of forward error correction coding (FEC) with a Frame Error Rate (FER) target value, and if the statistical value of FEC is greater than the FER target value, for example, 1%, the SIR target value is increased; otherwise, the SIR target value is decreased.
In the method provided by the invention, an E-HICH channel for bearing ACK/NACK response of all uplink HARQ processes of the UE can be used as a downlink reference channel, an uplink DPCH channel distributed for the UE is used as an uplink reference channel, and a method for performing power control on an uplink/downlink physical channel by utilizing a closed-loop power control technology can also be used. The general implementation flow of this method is the same as the flow shown in fig. 2, except that the method for adjusting other channels in the uplink physical channel by using the uplink DPCH channel is different, for example, since the reference power of the scheduled E-PUCH channel is the same as the reference power of the unscheduled E-PUCH channel, the adjustment values of the scheduled E-PUCH channel and the unscheduled E-PUCH channel are:
PULDPCH+Δschd-ULDPCH+βE-TFCI+γSF+KE-PUCH；
wherein, PULDPCHAdjusting value after power control is carried out on the uplink DPCH channel; deltaschd-ULDPCHThe power offset between an uplink DPCH channel and a non-scheduling E-PUCH channel is obtained; beta is aE-TFCIThe gain index is normalized relative to the reference power of a scheduling E-PUCH channel after selecting the E-TFCI, the distributed E-PUCH physical resources and the modulation type; gamma raySFIs the gain factor corresponding to the selected spreading factor; kE-PUCHIs a constant related to the Qos of the MAC-d flows mapped onto E-DCH, configured by higher layer signaling.
The adjusted value of the E-URCCH channel is as follows:
PULDPCH+ΔE-RUCCH-ULDPCH；
wherein, PULDPCHObtaining the power value of an uplink DPCH channel for power control adjustment; deltaE-RUCCH-ULDPCHIs the power offset between the E-RUCCH channel and the uplink DPCH channel.
The power control method of the E-HICH channel and the row DPCH channel can be applied to the situation that the non-scheduling E-PUCH channel is not allocated to the UE at the network side. Of course, when the network side allocates the non-scheduled E-PUCH channel to the UE, a scheme of power control of the E-HICH channel plus the row DPCH channel may also be used.
In this embodiment, a case where the uplink reference channel and the downlink reference channel are jointly subjected to closed-loop power control is described, that is, both the uplink reference channel and the downlink reference channel are subjected to power control. According to the technical solution of this embodiment, only the uplink reference channel or only the downlink reference channel may be power controlled, and the corresponding reverse channel may be used to carry the TPC symbol.
The method provided by the embodiment can be used in two HSUPA scenes. One is the scene of HS-DSCH plus E-DCH channel, and the other is DCH channel + E-DCH channel, where the HS-DSCH channel is a downlink shared channel used for transmitting HSDPA data service, the E-DCH channel is an uplink transport channel used for transmitting HSUPA channel data, and the DCH is a common dedicated transport channel.
The power control method in the DCH + E-DCH scenario is similar to the algorithm in the HS-DSCH + E-DCH scenario described above, and the same downlink and uplink reference signals are still used in the case of reservation of scheduling resources and in the case of no reservation of scheduling resources. Except that an extra formula for power adjustment needs to be defined for DL DPCH:
PE-HICH+ΔEAGCH-EHICH+βDPCH，TFIC+γSF；
here, PE-HICHFor the adjusted power value, Delta, of the E-HICH channelEAGCH-EHICHIs the power offset, beta, between the E-HICH channel and the downlink DPCH channelDPCH，TFICAnd gammaSFThe gain factors are respectively corresponding to the transmission format and the spreading factor selected by the downlink DPCH.
Of course, other dedicated channels may be selected as the reference channel. For example, the downlink DPCH channel allocated to the user is selected as the downlink reference channel, and the method of implementation is similar to the above method and will not be described in detail here.
Fig. 5 is a detailed block diagram of an apparatus according to a preferred embodiment of the present invention, which includes a UE 50 and a base station 51. Wherein, the UE 50 includes: a downlink reference channel receiving unit 501, a downlink power monitoring unit 502, an uplink reference channel transmitting unit 503, an uplink power obtaining unit 504, and an uplink power adjusting unit 505; the base station 51 includes: a downlink reference channel transmitting unit 511, an uplink power monitoring unit 512, an uplink reference channel receiving unit 513, a downlink power obtaining unit 514, and a downlink power adjusting unit 515.
Hereinafter, the structure of the apparatus according to the preferred embodiment will be described by transmitting downlink data and uplink data, respectively.
In the power control of the downlink physical channel, the downlink reference channel transmitting unit 511 in the base station 51 transmits data on the downlink reference channel. The downlink reference channel receiving unit 501 in the UE 50 receives data transmitted on the downlink reference channel by the downlink reference channel transmitting unit 511. The downlink power monitoring unit 502 obtains the SIR of the data received by the downlink reference channel receiving unit 501, and obtains the TPC value, i.e., the power control indication, according to the comparison between the obtained SIR and the SIR target value. When the uplink reference channel transmitting unit 503 needs to transmit data on the uplink reference channel, the TPC value in the transmitted data is set according to the obtained TPC value. The uplink reference channel transmitting unit 503 transmits the data carrying the TPC value. The uplink reference channel receiving unit 513 receives the data transmitted by the uplink reference channel transmitting unit 503. The downlink power obtaining unit 514 obtains an adjustment value of the downlink reference channel transmission power according to the TPC value carried in the data received by the uplink reference channel receiving unit 513, and indicates the transmission power used by the downlink reference channel transmitting unit 511 next time. The downlink power adjusting unit 515 adjusts other channels in the downlink physical channel according to the adjustment value of the downlink reference channel transmission power obtained by the downlink power obtaining unit 514.
In the power control of the uplink physical channel, the uplink reference channel transmitting unit 503 in the UE 50 transmits data on the uplink reference channel. The uplink reference channel receiving unit 513 in the base station 51 receives the data transmitted by the uplink reference channel transmitting unit 503 on the uplink reference channel. The uplink power monitoring unit 512 obtains the SIR of the data received by the uplink reference channel receiving unit 513, and obtains a TPC value, i.e., a power control indication, according to the comparison of the obtained SIR and the SIR target value. When the downlink reference channel transmitting unit 511 needs to transmit data on the downlink reference channel, the TPC value in the transmitted data is set according to the obtained TPC value. The downlink reference channel transmitting unit 511 transmits the data carrying the TPC value. The downlink reference channel receiving unit 501 receives the data transmitted by the downlink reference channel transmitting unit 511. The uplink power obtaining unit 504 obtains an adjustment value of the uplink reference channel transmission power according to the TPC value carried in the data received by the downlink reference channel receiving unit 501, and indicates the transmission power used by the uplink reference channel transmitting unit 503 next time. The uplink power adjusting unit 505 adjusts other channels in the uplink physical channel according to the adjusted value of the uplink reference channel transmission power obtained by the uplink power obtaining unit 504.
Here, the downlink reference channel transmitting unit and the downlink reference channel receiving unit may also be referred to as a reverse reference channel transmitting unit and a reverse reference channel receiving unit, with respect to the uplink reference channel; similarly, the uplink reference channel transmitting unit and the uplink reference channel receiving unit may also be referred to as a reverse reference channel transmitting unit and a reverse reference channel receiving unit with respect to the downlink reference channel
Through the above description, the power control of the uplink physical channel and the downlink physical channel can be used separately or together.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (19)
1. A method of power control, comprising:
A. setting a dedicated channel in the physical channels as a reference channel;
B. performing power control on the reference channel to obtain a power value after the power control of the reference channel;
C. and B, adjusting the power of other channels in the physical channel according to the power value obtained in the step B.
2. The method of claim 1, wherein in step B, the reference channel is open-loop power controlled.
3. The method of claim 1, wherein in step B, the reference channel is closed-loop power controlled.
4. The method of claim 3, further comprising: setting an SIR target value;
wherein, the performing closed-loop power control on the reference channel to obtain the power value after power control includes:
the receiving end of the reference channel measures the signal-to-noise ratio (SIR) of the reference channel, compares the current SIR with a set SIR target value, and sends a reduction instruction to the sending end of the reference channel when the obtained SIR is larger than the SIR target value, and the sending end reduces the transmitting power of the reference channel by one Step length according to the reduction instruction to obtain a power value after power control; and when the obtained SIR is smaller than the SIR target value, sending an increase instruction to a sending end of the reference channel, and increasing the transmitting power of the reference channel by one Step length Step by the sending end according to the increase instruction to obtain a power value after power control.
5. The method of claim 4, further comprising setting a standard error frame rate;
estimating data transmitted in the reference channel by a receiving end of the reference channel to obtain an error frame rate, comparing the obtained error frame rate with a standard error frame rate, and increasing the SIR target value when the obtained error frame rate is greater than the standard error frame rate; and when the obtained error frame rate is less than the standard error frame rate, reducing the SIR target value.
6. Method according to claim 4 or 5, characterized in that a dedicated channel in a physical channel opposite to the reference channel direction is set as a reverse reference channel, the decrease or increase indication being carried by the power control command, TPC, symbols of the reverse reference channel.
7. The method of claim 1,
the reference channel is an enhanced hybrid automatic repeat request indicator channel E-HICH for bearing acknowledgement/non-acknowledgement ACK/NACK responses of all uplink hybrid automatic repeat request HARQ processes of the UE;
in step C, the adjusting of the power of the other channels in the physical channel is adjusting the power of the other channels in the downlink physical channel.
8. The method of claim 7, wherein the downlink physical channel comprises an enhanced absolute grant channel (E-AGCH); in the step C, the step C is carried out,
the power of the E-AGCH channel is adjusted as follows: and adding the power value of the E-HICH channel after the power control to the power offset between the E-HICH channel and the E-AGCH channel to obtain the power of the E-AGCH channel after the adjustment.
9. The method of claim 7, wherein the downlink physical channel comprises a downlink Dedicated Physical Channel (DPCH); in step C, the adjusting the power of other channels in the downlink physical channel includes: adjusting the power of a downlink DPCH channel;
the adjusting the power of the downlink DPCH channel is: adding the power value of the E-HICH channel after power control to the power offset and beta between the E-HICH channel and the downlink DPCH channelDPCH，TFCIAnd gammaSFObtaining the adjusted power of the E-HICH channel;
wherein, betaDPCH，TFCIA gain factor corresponding to a transmission format selected by the downlink DPCH; gamma raySFAnd the spreading factor corresponds to a gain factor.
10. The method of claim 1, 7, 8 or 9, wherein the reference channel is a non-scheduled E-PUCH channel; in step C, the adjusting of the power of the other channels in the physical channel is adjusting the power of the other channels in the uplink physical channel.
11. The method of claim 10, wherein the uplink physical channel comprises: scheduling the E-PUCH channel; in the step C, the step C is carried out,
the adjusting the power of the scheduled E-PUCH channel comprises: adding beta to the power value of the non-scheduling E-PUCH channel after power controlE-TFCI、γSFAnd KE-PUCHObtaining the adjusted power of the scheduling E-PUCH channel;
wherein, betaE-TFCIThe gain index is normalized relative to the reference power of a scheduling E-PUCH channel after selecting a transport format combination indicator E-TFCI, a distributed scheduling E-PUCH physical resource and a modulation type; gamma raySFIs the gain factor corresponding to the selected spreading factor; kE-PUCHIs a scheduling E-PUCH channel constant configured by the network side.
12. The method of claim 10, wherein the uplink physical channel comprises an E-RUCCH channel; in the step C, the step C is carried out,
the power of the E-RUCCH is adjusted to be as follows: and adding the power value of the non-scheduling E-PUCH channel after power control to the power offset between the E-RUCCH channel and the non-scheduling E-PUCH channel to obtain the power of the E-RUCCH channel after adjustment.
13. The method of claim 1, 7, 8 or 9, wherein the reference channel is: an uplink DPCH channel; in step C, the adjusting the power of other channels in the physical channel is: and adjusting the power of other channels in the uplink physical channel.
14. The method of claim 13, wherein the uplink physical channel comprises a scheduled E-PUCH channel; in the step C, the step C is carried out,
the adjusting the power of the scheduled E-PUCH channel comprises: uplink after power controlPower value of DPCH channel plus power offset, beta, between uplink DPCH channel and scheduling E-PUCH channelE-TFCI、γSFAnd KE-PUCHObtaining the adjusted power of the scheduling E-PUCH channel;
wherein, betaE-TFCIThe gain index is normalized relative to the reference power of a scheduling E-PUCH channel after selecting E-TFCI, allocated physical resources of the scheduling E-PUCH and a modulation type; gamma raySFIs the gain factor corresponding to the selected spreading factor; kE-PUCHIs a scheduling E-PUCH channel constant configured by the network side.
15. The method of claim 13, wherein the uplink physical channel comprises an E-RUCCH channel; in the step C, the step C is carried out,
the power of the E-RUCCH is adjusted to be as follows: and adding the power value of the uplink DPCH channel after the power control to the power offset between the E-RUCCH channel and the uplink DPCH channel to obtain the power of the E-RUCCH channel after the adjustment.
16. A power control apparatus, comprising:
the power control unit is used for carrying out power control on a reference channel which is a dedicated channel in the physical channel to obtain a power value of the reference channel after the power control;
and the power adjusting unit is used for adjusting the power of other channels in the physical channel according to the power value of the reference channel obtained by the power control unit.
17. The apparatus of claim 16, wherein the power control unit comprises:
the power monitoring unit is used for determining whether the power of the reference channel needs to be adjusted or not, and sending a power control instruction to the power acquisition unit when the power needs to be adjusted;
and the power acquisition unit is used for acquiring the adjusted power according to the power control instruction of the power monitoring unit.
18. The apparatus of claim 17, further comprising:
a reference channel transmitting unit for transmitting data on a reference channel;
a reference channel receiving unit for receiving data on a reference channel;
wherein,
the power monitoring unit is used for measuring and obtaining SIR according to data received by the reference channel, comparing the obtained SIR with an SIR target value and sending a power control instruction for reducing or increasing the reference channel to the power acquisition unit;
the power acquisition unit is used for acquiring the adjusted power according to the power control instruction of the power monitoring unit; and controlling the transmitting power of the reference channel transmitting unit according to the adjusted power.
19. The apparatus of claim 17 or 18, further comprising:
the reverse reference channel transmitting unit is used for carrying a power control instruction sent by the power monitoring unit to the power acquiring unit when sending data to the reverse reference channel receiving unit;
and the reverse reference channel receiving unit is used for receiving the power control indication carried by the reverse reference channel transmitting unit when transmitting the data and transmitting the power control indication to the power acquiring unit.
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