CN1879312A - Method, device and system for radio frequency power control in cellular systems - Google Patents
Method, device and system for radio frequency power control in cellular systems Download PDFInfo
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Abstract
Improved power control mechanism for cellular time division duplex systems supporting multislot services. The improved power control mechanism allows for individual adaptation transmission power control (TPC) commands to time slot specific interference conditions in case several time slots are assigned to one composite transmission channel (CTrCH).
Description
Technical field
The present invention relates to a kind of be used to the operate method of radio-frequency power control and the device and the system that can be used to carry out described method.Especially, this radio-frequency power control relates to a kind of fast power control that is used for based on the radio-frequency (RF) transmission system of time division duplex (TDD).
Background technology
The analog cellular telephone system that is called as first generation system has represented the major step of leading in the technology of information-intensive society to the evolution of the currently used digital system that is called as second-generation system.Second-generation system success economically is reflected on the cellular terminal of wide-scale distribution, and it has substantially exceeded the quantity of the telephone terminal in several production statuses, has represented the demand of modern society to lasting accessibility and instant messages exchange.The second-generation system of having developed such as GSM (global system for mobile communications), PDC (personal digital cellular), cdmaOne (IS-95) and US-TDMA (IS-136) etc. is mainly used in the realization wireless audio communication.In the operating process of those systems, the user more and more finds to use such as the advantage in other wireless service of message passing service (for example, Short Message Service) and data access service (for example, i pattern) etc.; But second-generation system lacks demand and privilege significantly, and this is absolutely necessary for the message transmission and the data access service that strengthen.
The third generation system that is about to be introduced into (though just having planned to introduce very many years ago) develops with solving the design premises that strengthens communication, and this enhancing communication for example needs high data transfer bandwidth, service quality to realize high quality graphic, video communication and the rapid data access service on special use and public packet-switched network so that for example be respectively applied for.Though third generation system is introduced into now, still in exploitation and the improvement it carried out on some details, this has reflected the complexity of the third generation system that causes owing to challenging design premises.Though a protective tissue has been gathered in the exploitation of third generation system, promptly in the third generation partner program (3GPP), the primary objective of third generation process is a single public global air interface.This target also is not implemented.Yet, the Eurasian area that comprises Japan and Korea S has determined to adopt WCDMA (Wideband Code Division Multiple Access (WCDMA)) air interface, and North America is embedded into existing second-generation system by adopting EDGE (strengthening the GSM evolution of data rate) and CDMA multiple carrier (cdma2000) with third generation service.The WCDMA standard has covered UTRAN-FDD (UMTS grounding wireless access network network-Frequency Division Duplexing (FDD)) system and UTRAN-TDD (UMTS grounding wireless access network network-time division duplex) system, and its applicability depends primarily on the availability of its used frequency band.Provide in the symmetry and the tdd systems of asymmetric downlink data communication with the self-adaption CDMA element by the current GSM standard being transplanted to one, China Wireless Telecommunication Standar group (CWTS) has advanced its third generation system that is called as TD-SCDMA (TD SDMA).TD-SCDMA has passed through the approval of International Telecommunications Union (TTU) and has been included in the WCDMA-UTRAN-TDD standard.
Radio resource efficiency is the subject matter that third generation system and particularly WCDMA system are faced.Effective utilization of Radio Resource relates to different fields, wherein especially comprise: in the sub-district of this class WCDMA system the independent data rate of customized portable terminal, in this sub-district customized portable terminal sum and in the sub-district available aggregate date rate, this only is selected works that list related field.Cdma system and corresponding WCDMA system carry out power control mechanism for radio resource efficiency.Carrying out this power control mechanism will be received with the suitable radio frequency power level of determining as far as possible with the radiofrequency signal that guarantees to be sent by the cellular transceiver of cellular terminal (UE) or base station (BS).Suitable radio frequency power level is in conjunction with such as near-far problem, path loss, of determining of environmental impact such as Rayleigh fading fast by desired data transfer rate and data reliability.
In order to realize power control, the purpose of WCDMA standard is to implement to be applicable to the outer shroud and the inner loop power control of radiofrequency signal power control of the physical channel of two data transfer directions, and described both direction it is contemplated that and is down link (from the base station to cellular terminal) and up link (from the cellular terminal to the base station) direction.
Summary of the invention
The improved power control mechanism that the purpose of this invention is to provide a kind of power control of the WCDMA of being applicable to standard.More particularly, the purpose of this invention is to provide a kind of enhancing inner loop power controlling mechanism that is specially adapted to support the tdd systems of multi-slot service.
Mechanism, equipment and the system of the radio frequency transmission power of purpose of the present invention by being used for adjusting selectively each time slot realize.
Advantage of the present invention mainly is to realize the lower through-put power of transfer of data, it means through-put power is best and still less interference occurs in wireless network, and this causes with the RRM of economy universe network quality and capacity being improved.The advantageously available any UTRAN TDD of the present invention (UMTS grounding wireless access network network-time division duplex) system implements, and is particularly useful for TD-SCDMA (time division synchronous code division duplex multiple access) system.
According to a first aspect of the invention, provide a kind of method that is used in the improved through-put power control of time division duplex cellular system of the multi-slot service of supporting data communication.Obtain public target signal quality levels and the independent levels of quality of service relevant with the independent time slot that separates, wherein independent time slot is assigned to a synthetic transfer channel of transmitting data stream, and the transfer channel that this composite channel merges one or more separation obtains.The independent target signal qualities skew rank relevant with separately time slot is determined according to levels of quality of service separately.Then, determine and the corresponding relevant independent target signal qualities rank of time slot with independent target signal qualities skew rank based on the public target signal quality levels.At last, can obtain the through-put power control relevant according to the independent target signal qualities rank that is determined, so that through-put power control is suitable for the concrete disturbed condition of each time slot with corresponding time slot.
According to one embodiment of present invention, by the quality scale of service separately is mapped to the mass shift rank that the number of signals scale is determined independent echo signal from the quantity of service scale.This mapping can be defined as relation that levels of quality of service value and signal quality levels value are associated.
According to another embodiment of the invention, determine independent target signal qualities skew rank by the difference between the independent levels of quality of service of shining upon independent levels of quality of service and combination.
According to still another embodiment of the invention, the independent levels of quality of service of combination is defined as other function of independent quality of service level.Separately the functional relation between the independent levels of quality of service of levels of quality of service and combination is not limited to any concrete function, but can be preferably such as the average function relation of arithmetic average, geometric average, weighted average, quadratic average, harmonic average etc.
According to another embodiment of the invention, levels of quality of service is the error rate (BER) separately.
According to still another embodiment of the invention, adjust the public target signal quality levels according to the public target levels of quality of service of determining by the data of on synthetic transfer channel, transmitting and the levels of quality of service of public-measurement.Especially, levels of quality of service is the data reliability amount such as Block Error Rate (BLER) or other soft data reliability information etc.
According to another preferred embodiment, the public target signal quality levels can obtain from the exterior ring power controlling mechanism.
According to one embodiment of present invention, the public target signal quality levels is public target signal-to-jamming ratio (SIR).
According to another embodiment of the invention, through-put power control can be sent the transmission power control command of each time slot.Through-put power control can be applicable to the data communication that up link and/or downlink side make progress.
According to still another embodiment of the invention, synthetic transfer channel is the synthetic transfer channel of coding.
According to still another embodiment of the invention, time division duplex cellular system is Wideband Code Division Multiple Access (WCDMA)-time division duplex (WCDMA-TDD) system, and a TD SDMA (TD-SCDMA) system more specifically.
According to a second aspect of the invention, provide a kind of computer program that is used for carrying out in the method for the improved through-put power control of the time division duplex cellular system of supporting the multi-slot service.This computer program comprises program code segments, when this program was moved on computer, terminal, the network equipment, portable terminal, mobile communication terminal or application-specific integrated circuit (ASIC), this program code segments was used to carry out the step of method according to the abovementioned embodiments of the present invention.Alternatively, an application-specific integrated circuit (ASIC) (ASIC) can be carried out one or more instructions that are suitable for realizing the said method step of the above embodiment of the present invention, and promptly it is equivalent to above-mentioned computer program.
According to a third aspect of the invention we, a kind of computer program is provided, it comprises the program code segments that is stored on the machine readable media, carry out when computer program moves on computer, terminal, the network equipment, portable terminal or mobile communication terminal, this program code segments is used to carry out the step of method according to the abovementioned embodiments of the present invention.
According to a forth aspect of the invention, provide a kind of and be included in the carrier wave and the computer data signal of presentation directives, when it is carried out by processor, made the step of method according to the abovementioned embodiments of the present invention be performed.
According to a fifth aspect of the invention, provide a kind of transmission power controller that is used to support the time division duplex cellular system of multi-slot service.This transmission power controller has comprised the device that is used to obtain the public target signal quality levels at least; And be used to obtain other device of independent quality of service level.Each independent levels of quality of service all relates in several independent time slots.Time slot is assigned to a synthetic transfer channel that is used for data flow separately.Synthetic transfer channel merges one or several transfer channel and obtains.
Transmission power controller also comprises and is used for determining independent other device of target signal qualities skew level according to independent levels of quality of service.Each independent target signal qualities skew rank all relates in the independent time slot.Transmission power controller has comprised in addition and has been used for determining independent other device of target signal qualities level according to public target signal quality levels and independent target signal qualities skew rank.Each independent target signal qualities rank all relates in the independent time slot.Transmission power controller can be fitted to through-put power the independent disturbed condition of each independent time slot particularly.
According to one embodiment of present invention, be used for determining that independent other device of target signal qualities skew level comprises the device that is used for independent levels of quality of service is mapped to from the quantity of service scale number of signals scale.
According to another embodiment of the invention, transmission power controller comprises the device of the difference between the independent levels of quality of service that is used to shine upon independent levels of quality of service and combination so that determine independent target signal qualities skew rank.
According to another embodiment of the invention, transmission power controller comprises the device that is used for adjusting according to the levels of quality of service of public target levels of quality of service of determining by the data of transmitting and public-measurement the public target signal quality levels on synthetic transfer channel.
According to still another embodiment of the invention, levels of quality of service is the error rate separately.
According to still another embodiment of the invention, the public target signal quality levels is the public target signal-to-jamming ratio.
According to still another embodiment of the invention, transmission power controller comprises an exterior ring power controlling mechanism, and the public target signal quality levels can obtain from the exterior ring power controlling mechanism.
According to another preferred embodiment, transmission power controller is used for Wideband Code Division Multiple Access (WCDMA)-time division duplex (WCDMA-TDD) system, and especially for TD SDMA (TD-SCDMA) system.
According to a sixth aspect of the invention, provide a kind of cellular terminal, it can be operated in the time division duplex cellular system of supporting the multi-slot service.This cellular terminal has comprised a transmission power controller that is used to adjust the through-put power control of downlink transmission at least.This transmission power controller is corresponding to one of them of the embodiment of above-mentioned transmission power controller.
According to a seventh aspect of the invention, provide a kind of base station, it is used to support the time division duplex cellular system of multi-slot service.This base station comprises the transmission power controller of at least one through-put power that is used to adjust uplink data transmission control.This transmission power controller is corresponding to one of them of the embodiment of above-mentioned transmission power controller.
According to an eighth aspect of the invention, provide a kind of Radio Access Network (RAN) system, it is used to operate the honeycomb tdd systems of supporting the multi-slot service.This wireless access network system comprises at least one base station and at least one radio network controller.This wireless access network system comprises a transmission power controller that is used to adjust the through-put power control of uplink data transmission in addition.This transmission power controller is corresponding to one of them of the embodiment of above-mentioned transmission power controller.This transmission power controller can be implemented as that a part is attached in the radio network controller and part is attached to a distributed transmission power controller in the base station.
Description of drawings
Accompanying drawing is comprised in interior so that understand the present invention further, and a part that is merged in and constitutes this specification.Description of drawings embodiments of the invention, and be used from specification one and explain principle of the present invention.In figure below:
Fig. 1 a has schematically illustrated the block diagram according to the power control mechanism that comprises exterior ring power control and inner loop power control of the embodiment of the invention;
Fig. 1 b has schematically illustrated the block diagram according to the exterior ring power controlling mechanism of the embodiment of the invention;
Fig. 2 a has schematically illustrated other view of first power stage;
Fig. 2 b has schematically illustrated other view of second power level control when carrying out the inner loop power adaptation mechanism of current techniques situation;
Fig. 2 c has schematically illustrated other view of the 3rd power level control when carrying out according to inner loop power adaptation mechanism of the present invention; And
Fig. 3 schematically illustrated the network entity that comprises Radio Access Network and cellular terminal sequence chart in case explanation according to the operation of the power control mechanism of the embodiment of the invention.
Embodiment
This specification will be especially with the frame of reference of TD-SCDMA (TD SDMA) standard as the multi-slot service that is supported in the transfer of data that up link and/or downlink side make progress.The TD-SCDMA standard is by distinguishing as the access scheme of direct sequence CDMA (DS-CDMA), and it has the information that distributes at the TDD (time division duplex) that is used for operating respectively with azygous frequency band on the bandwidth of about 1.6MHz.Tdd mode is defined as a duplex method, thus by using the synchronous time interval on identical radio frequency, to deliver forward link (down link) and reverse link (up link) transmission.In TDD, the time slot in the physical channel is divided into radiating portion and receiving unit.Information on forward link and the reverse link is alternately launched.In TD-SCDMA, in inserting, multichannel except DS-CDMA, has the TDMA element.Therefore, multichannel inserts toward contact owing to the TDMA characteristic that increases is represented as TDMA/CDMA.Depend on the allocation plan with 200kHz carrier raster, the carrier spacing is 1.6MHz.The radio frames of a 10ms is divided into the subframe of two 5ms.In each subframe, there are 7 main time slots and 3 particular time-slots.Therefore, a basic physics channel is distinguished by frequency, code and time slot.TD-SCDMA uses the identical 72 frame superframes structure of being advised with UTRAN (UMTS grounding wireless access network).
Allow promptly on each up link and down link, to handle Network on two-way in conjunction with the time division multiple access (TDMA) of time division duplex (TDD).Particularly, TDMA use 5ms subframe is convenient to emission repeatedly, and subframe is subdivided into 7 time slots, and this can be distributed to several users or a user who requires a plurality of time slots neatly.The TDD principle allows Network to use same frame and different time-gap to transmit on up link and down link.For wherein for example there being mass data to be transferred to the asymmetric services of cellular terminal from the base station, time slot used on the down link will be more than up link.
As mentioned above, power control mechanism is absolutely necessary for operating a cellular terminal in the sub-district that shared Radio Resource is provided efficiently.This power control mechanism has been considered this demand, adjusts, proofreaies and correct and manage the through-put power of two-way (being up link and the down link) radiofrequency signal that comes from base station and cellular terminal in an efficient mode.Usually, the purpose of power control is the interference in the minimization system, to alleviate cochannel and cross channel interference so that strengthen resource-sharing.The principal element of considering be may be due to several different influences, such as Doppler shift, orthogonality imperfection, incorrect, the near-far problem of imperfection, multipath situation, time slot, cell topology and level, environment landforms and topology, terminal velocity, up link-down link difference and several other influence synchronously.
Under the anti-tampering technology such as fanned partition, audio active supervision, beam-forming technology, diversity technique, power control techniques is used among the cellular system.Power control techniques mainly solves near-far problem, apart from loss, cover and multipath and Rayleigh fading, and especially effective when considering that cochannel disturbs.Normally, WCDMA system and other cellular system have realized being suitable for the different power control mechanism of concrete operations, comprise two mechanism that are indicated as being open Loop Power control and closed power control on this operating principle.Closed power control can be divided into exterior ring power control and inner loop power control successively.
Open Loop Power control is commonly used to the through-put power of initial setting up link and down link, and is used for rough initial uplink through-put power of initial setting when the transmission beginning especially.Channel quality on transmission entity (being cellular terminal or base station) the estimation reverse link is so that determine a suitable forward link transmission power based on determined channel quality, and correspondingly vice versa.Open Loop Power control has several weak points, and one of them deficiency is to follow the tracks of decline fast.
More complicated solution of (fast) closed power control expression based on feedback control loop.Closed power is controlled in its simple embodiment to be controlled by the inner loop power that is used to control the through-put power on up link and the down link both direction to be represented.Receiving entity (being base station or cellular terminal) is measured the signal quality by the radio-frequency transmission signals of transmission entity (promptly being respectively cellular terminal and base station) emission.Measured signal quality is compared with target signal qualities, and receiving entity command transfer entity is adjusted the through-put power of radio-frequency transmission signals.This means and to keep through-put power, correspond essentially under the situation of target signal qualities at the signal quality of measuring, can be in a ratio of under the low situation in measured quality of signals and target signal qualities and improve through-put power, perhaps can be in a ratio of too high situation decline low transmission power in measured quality of signals and target signal qualities.Therefore, expression measurement-order-reaction system of being used for the reponse system of through-put power control is set up.The through-put power adjustment has also promptly for example enough caused indicated fast closed-loop power control so that overcome this fact of path loss variation and Rayleigh fading effect fast so that this fact to take place at a high speed.
Above-mentioned inner loop power control can be improved by combining with exterior ring power control.Exterior ring power control also is applicable to the through-put power that is controlled on up link and the down link both direction.Fig. 1 a has schematically illustrated the block diagram that comprises this class power control mechanism of controlling according to the exterior ring power control and the inner loop power of the embodiment of the invention.The service quality that the user perceives is inconsistent with measured signal quality inevitably, and it defines based on the physical values that obtains from the radiofrequency signal that is received routinely.The service quality that the user perceives can be described by the measuring amount relevant with the error rate value that obtains from the radio-frequency transmission signals coded data that is received more reliably.Suitable service quality can be for example obtains or can estimate about soft reliability information from error detection occurs based on Cyclic Redundancy Check, the Eb/E0 that this soft reliability information comprises Block Error Rate (BLER), frame error rate (PER), the error rate (BER), original or physical error rates (BERRAW), receive (signal quality of the every bit that is divided into by noise spectral density), come from the Viterbi encoder with convolution code soft information, come from the soft information of turbo encoder etc.
Exterior ring power control is corresponding to the additional iteration in the inner loop power control.Exterior ring power control is used for based on measured service quality modifying target signal quality neatly.Fig. 1 b has schematically illustrated the block diagram of exterior ring power controlling mechanism according to an embodiment of the invention.The service quality that is received is measured by receiving entity.Be better than under the situation of requirement service quality in reception service quality, reduce signal quality, and be inferior under the situation that requires service quality, improve signal quality in reception service quality.Requirement service quality based target service quality again defines.
The exterior ring power controlling mechanism allows feedback control mechanism is transformed into the data reliability mass measurement from the mass measurement of physical signalling integrality, and data reliability mass measurement and service request are comparable.For example, voice service can be supported not significantly several percentage points soft error rate of degeneration, but not Real-time Data Service can be supported much higher soft error rate, this is because can use and retransmit and do not have the remarkable degeneration of non real-time service quality, wherein degenerate may cause the reduction of conceptual data throughput or cause operating in delay.Real-time Data Service may reduce qualitatively significantly, and it is often reflected by the strict service request relevant with data reliability.The service request of this class strictness can be by being met for above-mentioned suitable destination service quality of exterior ring power controlling mechanism definition.
With reference to figure 1a, it has schematically illustrated the power control mechanism of being discussed that comprises inner loop power control and exterior ring power control again.Receiving entity (being base station or cellular terminal) receives the radiofrequency signal that originates from corresponding far-end transmission entity (promptly being respectively cellular terminal and base station) that is associated with one or more transfer channels (TrCH).Go up the service quality of the data of transmission at one or more transfer channels (TrCH) and measured by the mass measurement 100 that receives, this mass measurement 100 for example produces the Block Error Rate (BLER) of the measurement that is obtained by Cyclic Redundancy Check or enough magma reliability informations.This service quality is provided for the exterior ring power controller 200 of adjusting target signal qualities, is target sir (SIR at this
TARGET).This means and estimate new target sir (SIR
TARGET), it is assumed that and is more suitable for receiving data in going up at the transmission channel (TrCH) of the desired service quality of being determined by the destination service quality.Such as target Block Error Rate (BLER
TARGET) the destination service quality that waits is to go up a function of the service of operation at transmission channel (TrCH).New target sir (SIR
TARGET) estimation routinely based on realistic objective signal-to-jamming ratio by predefined signal-to-jamming ratio step of updating (Δ SIR) increase and decrease.
Adjusted new target sir (SIR
TARGET) can offer inner loop power control now.Yet an improved exterior ring power controlling mechanism may be considered compensation of delay, and the adjustment that its permission comes the modifying target signal quality based on the exterior ring power controlling mechanism is so that also reflect also unenforced through-put power control (TPC) order of being sent.It is time-consuming that processing and signal transmit, and it can cause the time-delay in the The whole control feedback control loop.The consumption of time is upgraded at interval according to sampling interval or power routinely and is described, and here describes with the time-delay frame.Has target sir (SIR
TARGET) compensation of delay 250 target sir (the SIR of a compensation of delay is provided
TARGET Delayed), therefore it be modified.
Then with the target sir (SIR of compensation of delay
TARGET Delayed) offering inner loop power controller 300, it produces and sends through-put power (TPC) order at last.The inner loop power controlling mechanism has other interior ring relevant parameter easily, and it has comprised a measures signal quality (SIR at least
Measure) so that produce through-put power (TPC) order.Preferably, signal quality (SIR
Measure) from the mass measurement 100 that receives, obtain again.
Yet especially in WCDMA TDD system and more specifically in the TD-SCDMA system, above-mentioned exterior ring power controlling mechanism may cause waste of radio resources.As above described in detail, can allow the TD-SCDMA system to support the multi-slot service, promptly allow several time slots to be grouped and be associated with a transfer channel that is used for transfer of data.
For example, suppose and have a plurality of time slots of distributing to one such as the transfer channel (TrCH) of the synthetic transfer channel (CCTrCH/CCTCH) etc. of coding.The amount that is used for the quality of inner loop power control should be a signal-to-jamming ratio, and it is with estimated signals interference ratio (SIR
Measure) the form target sir (BLER that in each time slot, estimated and provide with exterior ring power control
TARGET) compare.Correspondingly, in each time slot, produce through-put power control (TPC) order seriatim so that according to estimated signal interference ratio (SIR
Measure) and target sir (SIR
TARGET) relatively adjust through-put power.As can be seen, even on several time slots, may exist the interference in transmission and each time slot situation to have very big-difference simultaneously, a public target signal-to-jamming ratio (SIR who determines by exterior ring power control
TARGET) also be defined to be used for inner loop power control.
With reference to figure 2a and Fig. 2 b, it has illustrated such public target signal-to-jamming ratio (SIR
TARGET) weak point.Fig. 2 a and Fig. 2 b have schematically described and have comprised abstract interference rank and other rank block diagram of target sir level.Especially, Fig. 2 a has described expression by time slot TS
iThe very first time of determining at interval first (physical channel) signal quality and by time slot TS
I+1The interference rank of second (physical channel) signal quality in second time of determining.Should be noted that for for the purpose of fully, respectively, described interference level indication low signal quality, and the low rank of disturbing is correspondingly indicated high signal quality.The rank of first signal quality and secondary signal quality is assumed that identical, promptly has same interference rank.In addition, a real goal signal-to-jamming ratio rank (SIR has been described
TAROET).Target sir (SIR
TARGET) should be by the exterior ring power controlling mechanism based on the Cyclic Redundancy Check measurement and by means of target Block Error Rate (BLER
TARGET) the destination service quality described adjusts voluntarily.Therefore, the target sir (SIR that comes from outer shroud PC
TARGET) be the global measuring result of all time slots, all transfer channels (TrCH) in the synthetic transfer channel (CCTrCH) of coding calculate because the Cyclic Redundancy Check result is based on, and it (comprises time slot TS on this illustrative ground at all time slots
iAnd TS
I+1) in be transmitted and be assigned to the synthetic transfer channel (CCTrCH) of coding.
Suppose a public target signal-to-jamming ratio (SIR
TARGET) being used to distribute to all time slots of the synthetic transfer channel (CCTrCH) of a coding, the exterior ring power controlling mechanism is lowered to the modification efficient of the disturbed condition of each time slot so.The shortage of efficient is from can obviously finding out with reference to figure 2b.
Fig. 2 b has also described expression by time slot TS
iThe very first time of determining at interval first (physical channel) signal quality and by time slot TS
I+1The abstract interference rank of the secondary signal quality in second time of determining.Opposite with situation about describing among Fig. 2 a, suppose that the rank of first signal quality and secondary signal quality is different, promptly the rank of first signal quality is higher than the rank of secondary signal quality far away.Correspondingly, time slot TS
I+1Interference be superior to time slot TS
iThe interference rank.
For example, suppose two time slot TS once more
iAnd TS
I+1Be associated with the synthetic transfer channel (CCTrCH) of a coding, but carrier/interface ratio (C/I) situation in time slot is owing to carve at a time and come from the interference of not expecting of other sub-district and increased widely.The increase of carrier/interface ratio (C/I) situation has caused interference level, and other increases simultaneously.This class is increased among above-mentioned Fig. 2 b and describes to some extent.Other increases the increase that further causes the Cyclic Redundancy Check measurement result interference level, and this result points out that simultaneously service quality has also worsened.This means that the exterior ring power controlling mechanism of instruction will correspondingly be adjusted public target signal-to-jamming ratio (SIR in the above
TARGET).This class has illustrated by the exterior ring power controlling mechanism based on being adjusted at voluntarily of signal and service quality execution among Fig. 2 b.From being indicated as old target sir (SIR
TARGET Old) the public target signal-to-jamming ratio (SIR of a reality
TARGET) beginning, the public target signal-to-jamming ratio of an adjustment is produced by the exterior ring power controlling mechanism.The public target signal-to-jamming ratio of adjusting becomes along with its generation effectively, therefore the public target signal-to-jamming ratio of adjusting replaced reality/old public target signal-to-jamming ratio (SIR
TARGET Old).Therefore, the public target signal-to-jamming ratio of adjustment is designated as new public target signal-to-jamming ratio (SIR
TARGET New).
Even under the unaltered situation of disturbed condition, new public target signal-to-jamming ratio (SIR
TARGET New) increase will cause the not only increase in the time slot under carrier/interface ratio (C/I) situation of signal quality deteriorates of through-put power adjustment, but also the increase in any other time slot that the synthetic transfer channel with coding is associated.
TDD system standard is according to the skew of having disturbed level definition between the different time-gap, so that respectively in them each adjusted to their corresponding rank and carrier/interface ratio (C/I) situations disturbed.Yet TDD system standard does not define any way and finishes this processing, and therefore any enforcement all is that the vender is distinctive.There is a such possibility, is the target sir (SIR of different time-gap
TARGET) the different skew of distribution.Default enforcement is all to suppose identical target sir (SIR for all time slots
TARGET), this measures based on Block Error Rate (BLER).
Notion of the present invention provides a kind of method, is used to determine to be applicable to signal-to-jamming ratio (SIR) skew of each time slot, has both made at public target signal-to-jamming ratio (SIR
TARGET) be defined when being used for multi-slot and connecting also like this.
By target sir (SIR
TARGET) signal quality of expression is based on by for example target Block Error Rate (BLER
TARGET) service quality of expression, and the Block Error Rate (BLER by measuring
Measure) determine.Block Error Rate (the BLER that measures
Measure) corresponding to the global service mass measurement of employed all time slots.Therefore, because conventional exterior ring power controlling mechanism provides a public target signal-to-jamming ratio (SIR who determines based on the overall interference condition of all time slots
TARGET), so the individual behavior of above-mentioned single time slot is obscured mutually with overall performance.Yet, each time slot TS
iThe relevant qos measurement of time slot be applicable to and determine public target signal-to-jamming ratio (SIR
TARGET) relative increase and decrease so that revise each time slot TS with an improved procedure
iInterior through-put power makes it be adapted to their independent disturbed conditions and carrier interference ratio C/I situation respectively.The qos measurement that time slot is relevant should be represented the independent disturbed condition of independent time slot individually.
Fig. 2 c has described the abstract interference rank corresponding to Fig. 2 b, but for time slot TS
iAnd TS
I+1Has independent target sir rank (SIR respectively
TARGET New(i) and SIR
TARGET New(i+1)).As mentioned above, the public target signal-to-jamming ratio (SIR that provides by the exterior ring power controlling mechanism of independent target sir rank
TARGET OLPC) and independent sir bias (Δ SIR (i)) generation.Relational expression can be expressed as follows with mathematical form:
Wherein, as mentioned above for example
Each time slot TS
iThe independent error rate (BER (i)) be applicable to and determine public target signal-to-jamming ratio (SIR
TARGET) relative increase and decrease.
Wherein, especially, one of Δ (X) expression is used for the independent error rate (BER
RAW(i)) be mapped to target sir (SIR
TARGET OLPC) the independent error rate (BER of scale
RAW(i)) generic function, and wherein more particularly, Δ (X) expression is used for the independent error rate (BER
RAW(i)) with in conjunction with the error rate (BER
RAW Combined) difference be mapped to target sir (SIR
TARGET OLPC) the generic function of difference of scale.Should be noted that signal-to-jamming ratio is defined within on the decibel scale (dB) usually.In conjunction with the error rate (BER
RAW Combined) usually can be from the independent error rate (BER
RAW(i)) obtain in the combination, it can be expressed as follows with mathematical form:
One is used for determining in conjunction with the error rate (BER
RAW Combined) straightforward procedure can be by to the independent error rate (BER
RAW(i)) be averaged and obtain.For example, a weighted average is expressed as follows on mathematical form:
However, also can realize with definite independent sir bias (Δ SIR (i)) and combine the error rate (BER
RAW Combined) functional relation and the filtering of relevant other.The present invention is not subject to any concrete functional relation.And the present invention not intention is limited to the independent time slot TS of reflection
iThe error rate (BER of service quality
RAW(i)).Can use and reflect an independent time slot TS rightly
iThe amount of different service quality of service quality.
By the notion of the present invention that illustrates based on method according to the embodiment of the invention, total result will with each time slot is taked independently exterior ring power control similar, be more prone to thereby make power control mechanism in each time slot, find optimal transmission power mechanism to become.
May be implemented as a modification of power control mechanism current in the wireless access network according to the improved power control mechanism of the embodiment of the invention, this wireless access network is base station and radio network controller/base station controller and/or cellular terminal.What must guarantee is to have the radio frequency link information of the service quality of the independent time slot of expression according to the improved power control mechanism of the embodiment of the invention.According to embodiments of the invention, suitable radio frequency link information can be the error rate that can obtain from measurement report, physics (original) error rate etc.
An advantage according to the improved power control mechanism of the embodiment of the invention is lower (promptly more optimal) through-put power that improved power control mechanism has been realized transfer of data.This means the interference that in wireless network, occurs still less, so that handle the Radio Resource of finite frequency economically and will realize the increase of quality and/or capacity.Implement based on conventional power control mechanism that improved power control mechanism according to the embodiment of the invention is easy to manage and the complexity of improved power control mechanism remains acceptable.
Though about the TD-SCDMA system description according to the improved power control mechanism of the embodiment of the invention, those of ordinary skill in the art will readily appreciate that this improved power control mechanism is applicable to the WCDMA-UTRAN-TDD system.Especially, the down link process of WCDMA-UTRAN-TDD system adopts similar power control mechanism, to its suitable improved power control mechanism according to the embodiment of the invention.
With reference to figure 1a, the independent qos measurement of each time slot must be offered improved power control mechanism again according to the embodiment of the invention.This provides physical channel conditions and is pointed out that inner loop power controller 300 can be responsible for based on the public target signal-to-jamming ratio (SIR that is provided by the exterior ring power controlling mechanism by inside ring power controller 300 in Fig. 1 a
TARGET OLPC) determine time slot TS
iIndependent target sir rank (SIR
TARGET New(i)), more properly be compensation of delay signal-to-jamming ratio (SIR at this
TARGET OLPC) and independent sir bias (Δ SIR (i)).Sir bias (Δ SIR (i)) is from each time slot TS separately
iThe relevant qos measurement of time slot in be determined, it here is included in the physical channel conditions that is provided.
With reference to figure 3, with the operation of describing briefly according to the improved power control mechanism of the embodiment of the invention.The related system that is used to describe power control mechanism comprises on the one hand and comprises a base station (BS) and a corresponding radio network controller (RNC) wireless access network at least, comprises at least one cellular terminal (UE) on the other hand.
Up link (i.e. data communication from cellular terminal (UE) to base station (BS)), base station (BS) is responsible for sending through-put power control (TPC) order to cellular terminal (UE).In first operating procedure, cellular terminal (UE) is to base station (BS) transmitting radio frequency signal, and wherein this radiofrequency signal is encoded as and has comprised the data that will transmit.Base station (BS) received RF signal and can determine signal quality measured from the signal that is received.Data decode is carried out by radio network controller (RNC), and the signal that is received is transferred to this radio network controller (RNC) by base station (BS).Radio network controller (RNC) can be determined qos measurement from the signal that is received, the signal that this received the data that provided by cellular terminal (UE) is provided at first and is converted into the signal that is used for radio frequency transmission thus by radio network controller (RNC).Now, base station (BS) can come adaptive public target signal quality based on the qos measurement of being carried out by radio network controller.According to the present invention, base station (BS) also considers qos measurement, and it has reflected the independent interference rank in the time slot, and the independent target signal qualities of time slot is applicable to power control thus.At last, base station (BS) sends through-put power control (TPC) order of each time slot and orders to cellular terminal (UE) through-put power control (TPC).Cellular terminal (UE) can be according to adaptive its through-put power of through-put power control (TPC) order that receives now.As can be seen, exterior ring power controlling mechanism and inner loop power controlling mechanism are assigned with between base station (BS) and radio network controller (RNC).
Down link (i.e. data communication from base station (BS) to cellular terminal (UE)), cellular terminal (UE) is responsible for sending through-put power control (TPC) order to base station (BS).In first operating procedure, to cellular terminal (UE) transmitting radio frequency signal, wherein this radiofrequency signal code data will be transmitted base station (BS).Cellular terminal (UE) received RF signal and can determine signal quality measured from the signal that is received.The signal that cellular terminal (UE) can also be decoded and be received can obtain to come from the qos measurement of the data of the gained of decoding thus.Now, cellular terminal (UE) can come adaptive public target signal quality based on qos measurement.According to the present invention, cellular terminal (UE) is also considered qos measurement in addition, and it has reflected the independent interference rank in the time slot so that the independent target signal qualities of time slot is applicable to power control.At last, cellular terminal (UE) sends through-put power control (TPC) order of each time slot and orders to base station (BS) through-put power control (TPC).Adaptive its through-put power can be come according to through-put power control (TPC) order that is received in base station (BS) now.
Though described the present invention, for those skilled in the art, obviously can under the prerequisite that does not break away from spirit of the present invention, make change to described embodiment with reference to its special embodiment.Therefore, scope of the present invention is only limited by appending claims.
Claims (25)
1. method that is used in the improved power delivery control of the duplexing time division cellular system of supporting the multi-slot service comprises:
Obtain the public target signal quality levels; And
Obtain independent levels of quality of service, wherein in each independent levels of quality of service and the several independent time slots is relevant; Wherein said independent time slot is assigned to a synthetic transfer channel that obtains by merging one or several transfer channel that is used for data flow;
It is characterized in that:
Determine independent target signal qualities skew rank according to described independent levels of quality of service, wherein in each independent target signal qualities skew rank and the described independent time slot is relevant; And
Determine independent target signal qualities rank according to described public target signal quality levels and described independent target signal qualities skew rank, wherein in each independent target signal qualities rank and the described independent time slot is relevant, thereby can obtain through-put power control, it is suitable for the concrete disturbed condition of each time slot of described independent time slot.
2. method according to claim 1 comprises:
By being mapped to the number of signals scale from the quantity of service scale, described independent levels of quality of service determines described independent target signal qualities skew rank.
3. according to claim 1 or the described method of claim 2, comprise
Shine upon the difference between the independent levels of quality of service of described independent levels of quality of service and merging so that determine described independent target signal qualities skew rank.
4. according to the described method of any one claim before, the independent levels of quality of service of wherein said merging is described other function of independent quality of service level.
5. according to the described method of any one claim before, wherein said independent levels of quality of service is the error rate.
6. according to the described method of any one claim before, wherein said public target signal quality levels is adjusted according to the public target levels of quality of service of determining by the described data of transmitting on described synthetic transfer channel and the levels of quality of service of public-measurement.
7. according to the described method of any one claim before, wherein said public target signal quality levels can obtain from the exterior ring power controlling mechanism.
8. according to the described method of any one claim before, wherein said public target signal quality levels is the public target signal-to-jamming ratio.
9. according to the described method of any one claim before, described through-put power control can be for each time slot sends transmission power control command, and wherein said through-put power control is applicable to the data communication that up link and/or downlink side make progress.
10. according to the described method of any one claim before, wherein said synthetic transfer channel is the synthetic transfer channel of coding.
11. according to the described method of any one claim before, wherein said time division duplex cellular system is Wideband Code Division Multiple Access (WCDMA)-time division duplex (WCDMA-TDD) system, and TD SDMA (TD-SCDMA) system in particular.
12. computer program that is used for carrying out at the improved transmission power control method of the duplexing time division cellular system of supporting the multi-slot service, comprise when described program is moved on computer, terminal, the network equipment, portable terminal or mobile communication terminal, be used for the program code segments that enforcement of rights requires 1 to 11 any one step.
13. computer program that is used for carrying out at the improved transmission power control method of the duplexing time division cellular system of supporting the multi-slot service, comprise when described program product moves on computer, terminal, the network equipment, portable terminal or mobile communication terminal, be used for the program code segments on the machine readable media of being stored in that enforcement of rights requires 1 to 11 any one step.
14. one kind is included in the carrier wave and the computer data signal of presentation directives, when it is carried out by processor, makes that any one step in the claim 1 to 11 is performed.
15. a transmission power controller that is used to support the time division duplex cellular system of multi-slot service comprises at least
Be used to obtain the device of public target signal quality levels; And
Be used to obtain other device of independent quality of service level, wherein in each independent levels of quality of service and the several independent time slots is relevant; Wherein said independent time slot is assigned to a synthetic transfer channel that obtains by merging one or several transfer channel that is used for data flow,
It is characterized in that,
Be used for determining other device of independent target signal qualities skew level that wherein in each independent target signal qualities skew rank and the described independent time slot is relevant according to described independent levels of quality of service; And
Be used for determining independent other device of target signal qualities level according to described public target signal quality levels and described independent target signal qualities skew rank, wherein in each independent target signal qualities rank and the described independent time slot is relevant, and therefore described transmission power controller can be particularly be fitted to each independent disturbed condition in the described independent time slot to through-put power.
16. transmission power controller according to claim 15 is used for wherein determining that independent other described device of target signal qualities skew level comprises:
Be used for described independent levels of quality of service is mapped to from the quantity of service scale device of number of signals scale.
17., comprising according to claim 15 or the described transmission power controller of claim 16:
Be used to shine upon poor between the independent levels of quality of service of described independent levels of quality of service and merging, so that determine described independent other device of target signal qualities skew level.
18., comprising according to any one described transmission power controller in the claim 15 to 17:
Be used for adjusting the device of described public target signal quality levels according to the levels of quality of service of public target levels of quality of service of determining from the described data of transmitting at described synthetic transfer channel and public-measurement.
19. according to any one described transmission power controller in the claim 15 to 18, wherein said independent levels of quality of service is the error rate.
20. according to any one described transmission power controller in the claim 15 to 19, wherein said public target signal quality levels is the public target signal-to-jamming ratio.
21., comprising according to any one described transmission power controller in the claim 15 to 20:
Can therefrom obtain the exterior ring power controlling mechanism of described public target signal quality levels.
22. according to any one described transmission power controller in the claim 15 to 21, wherein said transmission power controller is used for Wideband Code Division Multiple Access (WCDMA)-time division duplex (WCDMA-TDD) system, and is used in particular for TD SDMA (TD-SCDMA) system.
23. cellular terminal that can in the honeycomb tdd systems of supporting the multi-slot service, move, at least comprise a transmission power controller that is used to adjust the through-put power control of downlink transmission, wherein said transmission power controller is according to any one transmission power controller in the claim 15 to 22.
24. base station that is used to support the honeycomb tdd systems of multi-slot service, at least comprise a transmission power controller that is used to adjust the through-put power control of uplink data transmission, wherein said transmission power controller is according to any one transmission power controller in the claim 15 to 20.
25. wireless access network system of supporting the honeycomb tdd systems of multi-slot service, wherein said wireless access network system comprises at least one base station and at least one radio network controller, wherein said wireless access network system also comprises the transmission power controller of the through-put power control that is used to adjust uplink data transmission in addition, and wherein said transmission power controller is according to any one transmission power controller in the claim 15 to 22.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103701734A (en) * | 2012-09-27 | 2014-04-02 | 联芯科技有限公司 | GPRS/EDGE (general packet radio service/ enhanced data rate for GSM evolution)-based self-adaptive time bias adjusting method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103701734A (en) * | 2012-09-27 | 2014-04-02 | 联芯科技有限公司 | GPRS/EDGE (general packet radio service/ enhanced data rate for GSM evolution)-based self-adaptive time bias adjusting method and system |
| CN103701734B (en) * | 2012-09-27 | 2017-05-24 | 联芯科技有限公司 | GPRS/EDGE (general packet radio service/ enhanced data rate for GSM evolution)-based self-adaptive time bias adjusting method and system |
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