CN101132203A - Control method for reinforcing power of uplink physical signal channel - Google Patents
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Abstract
This invention discloses a method for strengthening power of up physical channels including: a base station sets up a linkage with a user and sends a primary expected received power parameter to the user and distributes physical resources, the user carries out open-loop power control with the determined power transmitted data and the determined power is decided by gain factors decided by physical resources and primary expected received power parameters, which can determine the desired receiving power needed actually in the open-loop power control.
Description
Technical Field
The present invention relates to the High Speed Uplink Packet Access (HSUPA) technology field, and in particular, to a power control method for Enhanced Uplink Physical channel (E-PUCH).
Background
High Speed Uplink Packet Access (HSUPA) is a technology developed for High Speed transmission of Uplink data based on the third generation mobile communication technology, and can improve the throughput of network data transmission, improve the coverage capability of a cell, and reduce data transmission delay.
In the HSUPA technology, a base station (NodeB) allocates resources to a user through an E-DCH Absolute Grant Channel (E-AGCH) by using a scheduling-based method, where the resources include a code Channel, a time slot, power, and the like. Each User Equipment (UE) has its own power resource, and the power of one User is interference to another User, which is therefore also a cause of interference in the uplink. In order to ensure that the uplink interference is maintained at a stable level, the uplink transmit power of the user must be properly controlled. The objective of uplink power control is to increase the data transmission rate as much as possible on the basis of satisfying the resource limit of the interference-to-noise ratio (RoT, which is the ratio of the sum of the interference power between users, the interference power between cells, and the Thermal noise power) as possible.
In The R4/R5/R6 version of The Third Generation Partnership Project (3 GPP), uplink power Control is performed by sending desired received power to a user through Radio Resource Control (RRC) signaling. The uplink power control comprises two modes, one mode is open loop power control, when a base station and a user initially establish a link, the base station sends expected receiving power to the user through RRC signaling, the expected receiving power is the power received by the base station when data sent by the base station and the user are expected to reach the base station, and the sum of the expected receiving power and a path loss value is the initial sending power value of the user; the other is closed loop Power Control, in which a base station obtains a Transmit Control command (TPC) according to the measurement of the uplink reception quality of a user, and adjusts the user transmission Power by transmitting the TPC command to compensate for the path loss error and the channel fading.
In the HSUPA technology, an uplink data transmission Channel (Enhanced DCH, E-DCH) and a downlink resource Grant Channel (E-AGCH) are introduced. And the base station allocates resources to the users through the E-AGCH by adopting a scheduling method. When a user sends a message to a base station, because an E-DCH is newly introduced, the selection of an E-DCH Transport Format Combination (E-TFC) is required to be carried out according to resources allocated by the base station, an E-TFC is finally determined, and data on the E-DCH after the E-TFC is determined is mapped to an E-PUCH to be transmitted. If the open-loop power control is still performed according to the calculation method that the previous initial user transmission power is equal to the sum of the expected reception power and the path loss sent by the base station in the process, because the E-TFC is determined by user selection, the E-TFC may be different when the uplink data is sent each time, and different E-TFCs correspond to different expected reception powers, the base station cannot know the expected reception power corresponding to the selected E-TFC in advance, so the base station cannot reflect the expected reception power corresponding to the E-TFC when the base station sends the expected reception power to the user through RRC signaling, the initial user transmission power cannot reflect the actually required transmission power corresponding to the E-TFC according to the previous calculation method, and as a result, the effective power control cannot be performed.
In the subsequent communication process between the base station and the user, the base station adopts a mode of sending a TPC command to carry out closed-loop power control. However, in the closed-loop power control process, there is a situation that the time interval between two continuously received TPC commands is too large, and at this time, the TPC commands cannot track the change of the channel environment in time, that is, the TPC commands do not meet the power control requirement, so that the E-PUCH cannot be accurately controlled.
Disclosure of Invention
The invention aims to provide a power control method for enhancing an uplink physical channel, which aims to overcome the defect that the expected received power of a user in open-loop power control in the prior art cannot reflect the expected received power required by an E-TFC selected by the user each time, so that the effective power control cannot be carried out, and also overcome the defect that the accurate power control cannot be carried out on an E-PUCH when the time interval of two TPC commands in closed-loop power control is overlarge.
In order to solve the above technical problem, the present invention provides a method for controlling power of an enhanced uplink physical channel, which is implemented as follows:
a power control method for enhancing uplink physical channel includes steps:
the base station establishes a link with a user;
the base station sends a reference expected received power parameter to the user and allocates physical resources;
the user transmits data for open loop power control at a determined power determined by factors including a gain factor determined by the physical resource and a reference desired received power parameter.
The base station sends the reference expected received power parameter to the user and allocates physical resources according to the following steps:
the base station sends a reference expected received power parameter determined by factors including an interference average value and a reference target carrier-to-interference ratio of each time slot on the enhanced physical channel to a user;
the base station allocates physical resources to the users.
The open loop power control is completed according to the following steps:
selecting a transmission format combination according to the physical resources and determining a gain factor of the transmission format combination;
the user transmits data at a power determined by factors including a gain factor determined by the transport format combination and a reference desired received power parameter.
The selection of transport format combinations and the determination of their gain factors are done according to the following steps:
determining expected receiving carrier-to-interference ratios corresponding to different transmission format combinations according to physical resources;
the transport format combination is selected by determining the transmit power corresponding to the desired received carrier-to-interference ratio and determining its gain factor.
The determination of the expected receiving carrier-to-interference ratios corresponding to different transport format combinations is completed according to the following steps:
determining code rates corresponding to different transmission blocks in the transmission format combination according to the physical resources;
and determining the expected receiving carrier-to-interference ratio corresponding to each transmission block according to the code rate.
Determining the expected received carrier-to-interference ratio corresponding to each transport block is completed according to the following steps:
and obtaining the expected receiving carrier-to-interference ratio corresponding to each transmission block according to the mapping relation between the code rate provided by the high layer and the expected receiving carrier-to-interference ratio.
The method further comprises the steps of:
A. the base station sends a transmission power control command to a user, the user carries out data transmission with determined power to carry out closed loop power control, and the determined power is determined by factors including a gain factor determined by a transmission format combination, a reference expected received power parameter and the transmission power control command.
The performing of the closed-loop power control in the step a further includes:
B. and when the time interval between two continuously received transmission power control commands is larger than a threshold value, performing open-loop power control.
Performing open loop power control in step B according to the following steps:
C. when the time interval between two continuously received transmission power control commands is larger than a threshold value, the user transmits data with determined power to carry out open loop power control, and the determined power is determined by factors including a gain factor determined by physical resources and a reference expected received power parameter.
And C, completing the open loop power control in the step C according to the following steps:
when the time interval between two continuously received transmission power control commands is larger than a threshold value, a user transmits data with determined power to carry out open loop power control, and the determined power is determined by factors including a gain factor determined by physical resources and a reference expected received power parameter which is initially or transmitted again by a base station according to specific implementation conditions.
According to the technical scheme provided by the invention, the expected received power is determined by two factors, namely the reference expected received power parameter sent by the base station and the normalized gain factor corresponding to the E-TFC selected by the user, so that the sum of the expected received power and the path loss is adopted for transmission when the E-PUCH is initially sent, and the effective open-loop power control is realized; when the interval between two continuous TPC commands received by the user is larger than a threshold value, the open-loop power process is also adopted, and the accurate power control of the E-PUCH is realized by adopting a closed-loop power control mode under other conditions.
Drawings
FIG. 1 is a flow chart of power control on E-PUCH in the present invention.
Detailed Description
The core of the invention is to provide a power control method for enhancing an uplink physical channel. In specific implementation, a base station sends a reference expected received power parameter through RRC signaling, open-loop power control is carried out by power transmission determined by two factors, namely reference expected received power and a gain factor determined by physical resources, during initial sending of the E-PUCH, closed-loop power control is carried out during subsequent data transmission between the base station and a user, and an open-loop power process is also adopted when the interval between two continuous TPC commands received by the user is larger than a threshold value.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
FIG. 1 shows a flow chart of an implementation of the present invention.
Step 101: the user and the base station establish a link.
Step 102: the base station sends the reference expected received power parameter to the user through RRC signaling.
The base station firstly sends a reference expected received power parameter PRX through RRC signalingdes_baseTo the user.
The PRXdes_baseDetermined by the following expression:
PRXdes_base＝CIRe-base+Iini
the operations in dB are used in both the expression and the following expressions.
Wherein，CIRe-baseFor the reference target carrier-to-interference ratio, the introduction of this parameter is different from the prior art calculation method for the desired power. This value may be set to 0 to simplify the implementation. I isiniSending PRX for RRC signalingdes_baseThe interference average value of each time slot of the previously measured E-PUCH channel.
If CIRe-baseSet to 0, then the reference expected received power parameter at this time is:
PRXdes_base＝Iini
when the interval between two continuous TPC commands received by the user in the process of closed-loop power control is larger than a threshold value and the closed-loop power control is required to be switched into the open-loop power control, the base station can send the reference expected received power parameter to the user again through RRC signaling. This process depends on the specific implementation.
Step 103: and the user selects the E-TFC according to the E-TFC selection algorithm, obtains a corresponding gain factor, and sets the transmission power of the E-PUCH by adopting open loop power control in combination with the reference expected received power parameter.
The base station grants the available physical resources including allocated code channels, time slots and relative Power value (PRRI) to the user through the E-AGCH. And then the user determines the E-TFC according to the authorized time slot and code channel information.
The transmit power of the E-PUCH channel is determined by the following equation:
PE-PUCH＝Pe-base+L+βe+KE-PUCH (1)
and when the E-PUCH initially transmits data, open loop power control is adopted.
Pe-baseThis time equals the reference expected received power parameter PRX of the RRC transmission at the initial establishment of the linkdes_baseNamely:
Pe-base＝PRXdes_base
l is a path loss value measured from a beacon (beacon) physical channel, and when open-loop power control is adopted, the value is a smooth value, and when closed-loop power control is adopted, appropriate modification may be performed according to the configuration of a higher layer signaling and the difference in user specific implementation, and in this regard, the same as the specification in the TS25.224 section of 3GPP, and details are not described here.
β E is a gain factor, specifically a normalized gain factor corresponding to a certain E-TFC selected by the user. As mentioned above, each time a user sends uplink data, an E-TFC is selected, and data of the E-DCH is mapped to the E-PUCH and then sent to the base station through the air interface. Here, βeValue of (c) and a reference target carrier-to-interference ratio (CIR)e-baseTransport Block Set (TBS) size, allocated physical resources, spreading factor, and modulation scheme, and is expressed as:
βe＝CIRE-TFC-CIRe-base
visible, betaeIs a value set relative to a reference target carrier-to-interference ratio, and can be specifically determined by the following parameters:
1. a size of the selected E-TFC transport block;
2. resources occupied by an E-PUCH channel in a Transmission Time Interval (TTI) of an E-DCH;
3. the Modulation schemes include Quadrature Phase Shift Keying (QPSK) and 16-order Quadrature Amplitude Modulation (16 QAM).
The principle of the E-TFC selection algorithm is as follows:
1. the base station authorizes available physical resources to the user through the E-AGCH, wherein the physical resources comprise code channels, time slots, relative power values PRRI and the like;
2. the user can determine an E-TFC selection range according to the authorized information, and the whole range comprises a series of TBSs;
3. the user calculates the code rate lambda corresponding to different TBSs in the rangee；
Wherein,
λe＝Se/Re
Sefor the size of the transport block of the selected E-TFC, ReThe bit number of the physical channel after the E-DCH is mapped to the physical channel is further determined by the number of time slots, spreading factors, a modulation mode and the like;
4. according to code rate lambdaeAnd normalizing the expected received carrier-to-interference ratio (CIR)E-TFCAnd obtaining the expected receiving carrier-to-interference ratio corresponding to each TBS according to the mapping relation between the TBS and the TBS.
Determining CIRE-TFCThe higher layer provides a mapping function or a mapping relation table, and the mapping function defines the E-DCH transmission code rate lambdaeAnd a reference carrier-to-interference ratio, CIR, of each resource unitE-TFCThe relationship between them. Is defined as: at the reference target block error rate BLER (corresponding to K)E-PUCHTarget BLER of 1), the code rate of transmission on one resource unit is λeAt the receiving end, the normalized expected received carrier-to-interference ratio is CIRE-TFC. This mapping function can be obtained by link simulation.
Thus, the CIR is determinedE-TFCCan determine βeThen calculating the transmission power value;
5. and selecting a TBS corresponding to the maximum power value to transmit data according to the calculated transmission power value and the data amount in the user cache and the user power margin within the range of the relative power value PRRI. Thus, control of uplink RoT is embodied by PRRI.
KE-PUCHIs a constant signaled by higher layers. The high layer combines the receiving quality of MAC (Media Access Control) -d flow and the transmission times of Protocol Data Unit (PDU) and adopts a certain algorithmThe value is slowly adjusted. Quality of service (Qos) control of the MAC-d flow can be achieved by setting this value.
To this end, the transmit power of the E-PUCH may be determined as:
PE-PUCH＝CIRE-TFC+Iini+L+KE-PUCH (2)
here, KE-PUCHIs constant and can be known from the sum of the expected received power and the path loss value of the aforementioned user initial transmission power value without considering the influence thereof, here (CI)RE-TFC+Iini) Corresponding to the desired received power as described above. Wherein, IiniAnd PRXdes_baseRelated, CIRE-TFCAnd betaeIn this regard, it can be derived that the user initial transmit power is determined by factors including a reference expected received power parameter transmitted by the base station and the selected E-TFC. Because the initial transmitting power of the user takes the reference expected receiving power parameter transmitted by the base station and the selected E-TFC into account, the effective open-loop power control can be realized.
Step 104: and the user selects the E-TFC according to the E-TFC selection algorithm to obtain a corresponding gain factor, and sets the sending power by adopting closed-loop power control in combination with the reference expected received power parameter.
As mentioned above, during the following communication between the base station and the user, closed loop power control is performed by sending TPC commands.
When closed loop power control is employed, Pe-baseThe method comprises the following steps:
Pe-base＝PRXdes_base+step*∑TPCi＝PRXdes_base+PTPC
as can be seen from the formula, PTPCIs an accumulated quantity of closed loop power control, i.e. from setting Pe-baseThe accumulation of the TPC command adjustment power change amount in this process up to the current time. Step is the Step size of each TPC command, i.e.Each time the TPC command indicates a relatively increased or decreased power value, which is assigned by higher layer signaling, TPCiIs a closed loop control command, TPCiThe value of (d) may be +1 or-1, +1 denoting an increase and-1 denoting a decrease.
L，βeAnd KE-PUCHThe determination of the value of (c) is the same as the determination method in the open loop power control of step 103.
Step 105: and if the received interval of two continuous TPC commands is larger than the threshold value, returning to the step 103, and if the interval of two continuous TPC commands is smaller than the threshold value, executing the step 104.
As mentioned above, when performing closed-loop power control, sometimes the time interval between two consecutive TPC commands is too long, so that the TPC commands cannot track the change of the channel environment in time, i.e. the requirement of closed-loop power control cannot be met. Here, we predefine a threshold, and when the received two consecutive TPC command intervals are actually greater than the threshold, return to step 103, i.e. execute open loop power control; if the value is less than the threshold value, the closed loop power control is continued, i.e. step 104 is executed.
When the step 103 is shifted to perform the open loop power control, the base station may send the reference expected received power parameter, i.e. P, to the user again through RRC signalinge-baseSetting as a reference expected received power parameter PRX for base station retransmissiondes_baseThe base station may not transmit the reference expected received power parameter again to the user, but may use the previously transmitted reference expected received power parameter. This process depends on the specific implementation.
After the above power control process, the actual received power of the base station is:
PRx＝PE-PUCH-L′＝Pe-base+L-L′+βe+KE-PUCH
here, L' is the actual path loss at the time of transmission.
Since the base station can be based on E-TFC deducing betaeThus, the above P can be alignedRxThe calculation is normalized as:
PRx norm＝PE-PUCH-L′-βe--KE-PUCH＝Pe-base+L-L′
the base station may adjust P by sending TPC commandse-baseSo that P isRx normA desired target value of the base station according to system design and implementation can be achieved. This normalized reception target value is Te-base. If the TPC closed loop can converge, then there are:
E{PRx norm}＝E{Pe-base+L-L′}＝Te-base *
it can be seen from this equation that the TPC commands sent in closed loop power control are used to cancel the open loop error L-L' and compensate for the variation in interference (T)e-baseCan be adjusted according to the change of uplink interference
LCR TDD introduces a P relative to the usere-baseI.e., PRRI. When the base station grants the power offset delta to the user through the E-AGCH, the base station can reasonably manage the uplink RoT resource in this way because the base station knows the expected received power. Then, the received power at this time is:
PRx＝Pe-base+L-L′+Δ′
here, Δ' is the power offset used after E-TFC selection by the user, which cannot be larger than the base station allocated Δ, and therefore is necessarily smaller than Δ. If the adjustment by TPC is passed, then the equation is:
E{PRx}＝Te-base+Δ′
it is through this way that the base station manages and controls the RoT resources.
After the channel power setting method of the E-PUCH in the foregoing steps 101 to 105, the transmission power is:
PTx＝Pe-base +L +βe+KE-PUCH＝Iini+CIRe-base+PTPC +L+βe+KE-PUCH
if power control is more ideal, PRx normWill approach the actual total interference value ItotalAnd CIRe-baseAnd, the received carrier-to-interference ratio is:
C/I＝Itotal+CIRe-base+CIRE-TFC-CIRe-base+KE-PUCH-Itotal
＝CIRE-TFC+KE-PUCH
thus, the total interference power can be controlled to the target total interference value N by configuring the PRRI while ensuring the receiving quality of the selected E-TFC0Within + RoT, while K is configured by higher layersE-PUCHAnd different Qos requirements of the E-DCH can be embodied.
It can be seen from the above embodiments that the present invention implements accurate power control of the E-PUCH by the base station sending a reference expected received power parameter through RRC signaling when the user establishes a link with the base station, using open loop power control when the E-PUCH is initially sent, and also using open loop power process when the user receives two consecutive TPC command intervals greater than a threshold, and using closed loop power control in other cases.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (10)
1. A power control method for enhancing uplink physical channels is characterized by comprising the following steps:
the base station establishes a link with a user;
the base station sends a reference expected received power parameter to the user and allocates physical resources;
the user transmits data for open loop power control at a determined power determined by factors including a gain factor determined by the physical resource and a reference desired received power parameter.
2. The method of claim 1, wherein the base station transmitting the baseline expected received power parameter to the user and allocating the physical resource is accomplished by:
the base station sends a reference expected received power parameter determined by factors including an interference average value and a reference target carrier-to-interference ratio of each time slot on the enhanced physical channel to a user;
the base station allocates physical resources to the users.
3. The method of claim 1, wherein the open loop power control is accomplished according to the following steps:
selecting a transmission format combination according to the physical resources and determining a gain factor of the transmission format combination;
the user transmits data at a power determined by factors including a gain factor determined by the transport format combination and a reference desired received power parameter.
4. The method of claim 3, wherein said selecting a transport format combination and determining a gain factor thereof is accomplished according to the following steps:
determining expected receiving carrier-to-interference ratios corresponding to different transmission format combinations according to physical resources;
the transport format combination is selected by determining the transmit power corresponding to the desired received carrier-to-interference ratio and determining its gain factor.
5. The method of claim 4, wherein said determining expected received carrier-to-interference ratios for different transport format combinations is accomplished by:
determining code rates corresponding to different transmission blocks in the transmission format combination according to the physical resources;
and determining the expected receiving carrier-to-interference ratio corresponding to each transmission block according to the code rate.
6. The method of claim 5, wherein said determining the expected received carrier-to-interference ratio for each transport block is accomplished by:
and obtaining the expected receiving carrier-to-interference ratio corresponding to each transmission block according to the mapping relation between the code rate provided by the high layer and the expected receiving carrier-to-interference ratio.
7. The method of claim 1, wherein the method further comprises the steps of:
A. the base station sends a transmission power control command to a user, the user carries out data transmission with determined power to carry out closed loop power control, and the determined power is determined by factors including a gain factor determined by a transmission format combination, a reference expected received power parameter and the transmission power control command.
8. The method of claim 7, wherein performing closed loop power control in step a further comprises:
B. and when the time interval between two continuously received transmission power control commands is larger than a threshold value, performing open-loop power control.
9. The method of claim 8, wherein performing open loop power control in step B is accomplished according to the following steps:
C. when the time interval between two continuously received transmission power control commands is larger than a threshold value, the user transmits data with determined power to carry out open loop power control, and the determined power is determined by factors including a gain factor determined by physical resources and a reference expected received power parameter.
10. The method of claim 9, wherein performing open loop power control in step C is performed according to the following steps:
when the time interval between two continuously received transmission power control commands is larger than a threshold value, a user transmits data with determined power to carry out open loop power control, and the determined power is determined by factors including a gain factor determined by physical resources and a reference expected received power parameter which is initially or transmitted again by a base station according to specific implementation conditions.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009127125A1 (en) * | 2008-04-18 | 2009-10-22 | 大唐移动通信设备有限公司 | Method, system and device for sending and processing interference reference information |
| WO2010078702A1 (en) * | 2009-01-06 | 2010-07-15 | 中兴通讯股份有限公司 | A physical uplink shared channel transmission power control method and system |
| CN101998613A (en) * | 2009-08-21 | 2011-03-30 | 鼎桥通信技术有限公司 | Method for controlling power of evolved physical uplink channel (E-PUCH) in high-speed uplink packet access (HSUPA) system |
| CN101562880B (en) * | 2008-04-18 | 2011-04-27 | 大唐移动通信设备有限公司 | Method for sending and processing interference reference information as well as system and device thereof |
| CN102045823A (en) * | 2009-10-16 | 2011-05-04 | 大唐移动通信设备有限公司 | Method, system and equipment for controlling power |
| CN102111860A (en) * | 2009-12-25 | 2011-06-29 | 电信科学技术研究院 | Power control method and device for channels |
| CN102118835A (en) * | 2009-12-31 | 2011-07-06 | 中国移动通信集团设计院有限公司 | Method and device for setting channel expected received power and communication systems |
| CN102340858A (en) * | 2011-09-30 | 2012-02-01 | 电信科学技术研究院 | Method and device for setting target SINR (Signal-to-Interference and Noise Ratio) in PUSCH (Physical Uplink Shared Channel) power control |
| CN102469567A (en) * | 2010-11-05 | 2012-05-23 | 鼎桥通信技术有限公司 | Correction method of power authorization of E-DCH physical uplink channel (E-PUCH) |
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