CN100581088C - Management method for modulation scheme management, mobile unit, management unit and selection unit - Google Patents
Management method for modulation scheme management, mobile unit, management unit and selection unit Download PDFInfo
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- CN100581088C CN100581088C CN200480025812A CN200480025812A CN100581088C CN 100581088 C CN100581088 C CN 100581088C CN 200480025812 A CN200480025812 A CN 200480025812A CN 200480025812 A CN200480025812 A CN 200480025812A CN 100581088 C CN100581088 C CN 100581088C
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Abstract
The invention involves selection of modulation scheme for a mobile unit (100) having access to a link quality enhancing algorithm (130) operable only on data modulated using a subset of the available modulation schemes. The mobile unit (100) performs signal quality measurements on a communications link (410), over which data modulated with a first modulation scheme is communicated. A link quality measure is then determined for this first modulation. A quality enhancement due to operation of the algorithm (130) is also determined. This quality measure and the quality enhancement are used for generating decision information, which is reported to the network (200). There the information is used for estimating link quality measure(s) of currently non-employed modulation(s) for the mobile unit (100). The selection of a modulation scheme for the communications link is then performed based on the decision information and the estimated quality measure(s).
Description
Technical field
The present invention relates generally to is modulation scheme management in the radio communications system, the modulation scheme management that the performance enhancement techniques that in particular is subjected to use in this type systematic influences.
Background technology
Radio communications system now can use modulation scheme usually, and in described modulation scheme, the signal of beared information can superpose or be mixed in the carrier signal of propagation.
Concerning some communication system that comprises GSM (global system for mobile communications) or GPRS (general packet radio service) system, the available modulation scheme of unique selection is GMSK (Gaussian Minimum Shift Keying).GMSK is a kind of phase modulated of constant envelope, and in this modulation, emission bit 0 or bit 1 usefulness phase change are represented.Therefore, each symbol of being launched has all been represented a bit.
The introducing of EDGE (enhanced data-rates of GSM evolution) in gprs system provides the another kind of modulation scheme that can be used for radio communication, i.e. 8-PSK (eight attitude phase shift keyings).Concerning the gprs system that has used GMSK, 8-PSK makes it possible to utilize channel architecture, channel width and current mechanism and the function of this system again.Yet, comparing with GMSK, 8-PSK can provide higher bit rate at each time slot.8-PSK is a kind of linear method that has used phase place and amplitude, and in the method, three successive bits will be mapped to a symbol.Though its character rate is still identical with GMSK, each symbol has all been represented three bits rather than one now, thus total data rate has been promoted three times.
Can use GMSK can use nine kinds of different Modulation and Coding Scheme MCS1～MCS9 with EGPRS (Enhanced General Packet Radio Service) system of 8-PSK modulation.That four kinds of wherein lower encoding schemes are used is GMSK, and that five kinds of higher encoding schemes are used then is 8-PSK.These nine kinds of MCS have used different error correcting systems, are adapted at thus using under the different radio environment conditions.Usually, in the good wireless electrical environment, can use more positive (less error correction, the MCS that is associated with 8-PSK) encoding scheme, in abominable radio link environment, then use error correction more (MCS that is associated with GMSK) usually and have the encoding scheme of hanging down user data rate.
The EGPRS system has also used the link adaptation of expression link-quality controlled function.Link adaptation has been used from the radio link quality measurement of mobile unit and has been selected the most appropriate Modulation and Coding Scheme, so that subsequent data packet is sent to mobile unit.Only comprise measurement report the last time from the measurement report of mobile unit and be used to the link quality measurements modulated, for example BEP (BEP) later on.Yet because link quality measurements depends on employed certain modulation schemes, so network will be supposed the relative performance that GMSK modulation and 8-PSK modulate.For instance, if network receives a report, comprising receiving about mobile unit and by the BEP of the data of GMSK modulation, network can " be mapped to this GMSK BEP " the corresponding 8-PSK BEP value that obtains estimated so.
The subject matter of this prior art process is: what network used is the BEP mapping of single fixed modulation scheme.Yet GMSK might change because of the different of radio environment with the actual relative performance of 8-PSK modulation.At mobile unit interference mitigation technology is used for those data with a certain modulation scheme modulation, and does not use it under the data conditions of modulating with other one or more schemes, this problem might be aggravated.Typical example then is so-called SAIC (single antenna interference eliminated) or SAIR (single antenna is anti-interference) technology, and these technology are current can only to be used in combination with the GMSK modulation.Because SAIC can be according to actual wireless electrical environment and traffic loads and with the about 9dB of the performance boost of GMSK, therefore in the process that GMSK BEP is mapped to 8-PSK BEP value, will introduce the uncertainty relatively more than the 9dB.So, network might be not optimum Modulation and Coding Scheme for the mobile unit selection, and then might cause the predetermined radio blocks that is sent to mobile unit to be lost.
Summary of the invention
The present invention has overcome these and other defectives in the prior art scheme.
Main purpose of the present invention is that a kind of improved modulation scheme management is provided in communication system.
Another object of the present invention provides the more accurate determination information that is used to mobile unit to select modulation scheme in communication system.
Another object of the present invention provides the modulation scheme selection based on the performance of link-quality enhancement algorithms.
A kind ofly be used for producing determination information according to of the present invention so that from the multiple modulation scheme that can use for mobile unit, select the method for a modulation scheme at radio communications system, described mobile unit is adapted to the link-quality that the serviceability enhancement algorithms strengthens the communication link of a scheme subclass having used described a plurality of modulation schemes, and described method comprises step: described mobile unit) for to have used the described communication link of first modulation scheme in the described scheme subclass to determine the first modulation scheme relevant link quality; Described mobile unit produces the humidification of the link quality performance humidification that described performance enhancement algorithms caused and represents; And represent to produce described determination information based on described first modulation scheme relevant link quality and described humidification.
A kind ofly be used for producing determination information according to of the present invention so that from a plurality of available modulation schemes, select the mobile unit of a modulation scheme at radio communications system, described mobile unit comprises: the performance intensifier is used to strengthen the link-quality of the communication link of a scheme subclass having used described a plurality of available modulation schemes; Be used to the described communication link that uses first modulation scheme in the described scheme subclass to determine definite device of the first modulation scheme relevant link quality; Be used to produce the humidification that the humidification of the link quality performance humidification that the work of described performance intensifier caused represents and represent generating apparatus; And the device that is used for representing to produce described determination information according to the described first modulation scheme relevant link quality and described humidification.
A kind ofly be used for producing determination information so that select a kind of modulation scheme management unit of modulation scheme at radio communications system from a plurality of available modulation scheme that can use for mobile unit according to of the present invention, described modulation scheme management unit comprises: be used to the communication link of the described mobile unit that uses first modulation scheme that the generator of the first modulation scheme relevant link quality is provided; Be used to produce the humidification that the humidification of the link quality performance humidification that the operation of performance enhancement algorithms caused represents and represent generating apparatus, wherein said performance enhancement algorithms is suitable for strengthening the link-quality of the described communication link of a scheme subclass having used described a plurality of available modulation schemes, and described scheme subclass has comprised described first modulation scheme; And the device that is used for representing to produce described determination information according to the described first modulation scheme relevant link quality and described humidification.
According to a kind of modulation scheme selection unit that is installed in the radio communications system of the present invention, this unit is used for from selecting a modulation scheme for a plurality of modulation schemes that mobile unit uses, wherein said mobile unit then is adapted to the link-quality that the serviceability enhancement algorithms strengthens the communication link of a scheme subclass having used described a plurality of modulation schemes, described modulation scheme selection unit comprises: the device that is used to receive the determination information that comes from described mobile unit, described determination information has comprised the first modulation scheme relevant link quality that described communication link had of first modulation scheme of using in the described scheme subclass, and the humidification of the link quality performance humidification that caused of described performance enhancement algorithms is represented; And the choice device that is used for selecting the modulation scheme used for the described communication link that is connected to described mobile unit according to described determination information.
Briefly, the present invention relates to be used for selecting the determination information of modulation scheme, so that this modulation scheme is used to pass to the data of mobile unit from a plurality of available modulation schemes.This mobile unit can also use certain link-quality enhancement algorithms or unit, and wherein said algorithm or unit can act on a kind of or data that subclass is modulated of having used in the available modulation.This means that the algorithm that can be not used in other modulation by being used for one or more certain modulation schemes strengthens the link-quality that mobile unit meets with.
Mobile unit can be carried out the radio link that depends on modulation to those reception radio blocks of modulating with currently used modulation system and measure.These measurement results are used to determine the link quality measure of used modulation system.In addition, if enhancement algorithms can be used for this modulation, then can determine the final performance or the link-quality humidification of this algorithm.Then, mobile unit will produce the determination information based on link quality measure and quality humidification.This determination information will be reported to the unit of selecting modulation scheme in the network for mobile unit, for example PCU (packet control unit).There, determination information will form the basis of carrying out modulation selection and/or execution Modulation and Coding Scheme (MCS) selection relevant with this modulation scheme.By current quality humidification is included in the determination information, can select modulation scheme more accurately, and the radio blocks of having avoided unfavorable modulation system selection to cause is lost and the forfeiture of the stability of a system.
PCU usually can be based on the determination information that receives, and to be preferably based on that the quality metrics of current modulation and quality humidification come be that corresponding one or more link quality measure are estimated in current and untapped one or more modulation of mobile unit.Then, can select appropriate modulation scheme based on the quality metrics of the determination information that receives and one or more estimations.
By determining the link quality measure of current modulation by the operation of enhancement algorithms, and measure, can produce the quality humidification of algorithm by the respective quality of under the situation that does not activate this algorithm, determining identical modulation.Then, performance gain can be expressed as difference or its ratio between two quality metrics of given modulation.
Replacedly,, then can determine an activity ratio, and measure used as the quality enhancing if in some pulse train (some radio blocks), activate enhancement algorithms and this algorithm of in other pulse trains, stopping using.Usually, for this activation based on pulse train, its reason is: current traffic conditions and load are depended in the gain of enhancement algorithms, and might drop to zero gain from maximum enhancing gain, even might cause the link-quality of specified modulation mode to worsen.Therefore, comparatively preferably when this algorithm helps to strengthen link-quality, it is activated.For instance, can be expressed as be wherein to have activated the quantity of radio burst of enhancement algorithms divided by the potential sum that might activate the pulse train of this algorithm wherein to activity ratio.Alternatively, this activity ratio also can be replenished with the average enhancing gain of algorithm, strengthens data so that obtain more detailed quality.
If current business amount situation is depended in the enhancing of this algorithm gain, what the quality humidification that comprises in the determination information so preferably reflected is current quality humidification, for example last algorithm humidification of determining.Replacedly, a plurality of radio blocks/pulse trains or the average quality humidification on certain period also is operable.In this case, concerning the radio blocks of nearest reception, comparatively preferably with weighted average and increasing weighted combination use, so that obtain up-to-date quality humidification as far as possible.
Concerning according to modulation scheme of the present invention, the example comprises GMSK (Gaussian Minimum Shift Keying) and 8-PSK (eight attitude phase shift keyings), the example of enhancement algorithms then is SAIC (single antenna interference eliminated) or SAIR (single antenna is anti-interference), and these technology only are applicable to data rather than the 8-PSK data of using the GMSK modulation.
The invention provides following advantage:
In process, improved accuracy for current use and current and untapped modulation scheme estimation link quality measure;
Allow network to select optimum modulation scheme for mobile unit at any time;
Improved user's bit rate; And
Improved capacity of communication system.
By reading, can know and understand other advantages provided by the invention hereinafter about the description of inventive embodiments.
Description of drawings
By with reference to the description of hereinafter being carried out in conjunction with the accompanying drawings, can understand the present invention and further target and advantage best, wherein:
Fig. 1 is the schematic diagram that can use the radio communications system part of instruction of the present invention;
Fig. 2 is the schematic block diagram of describing according to mobile unit of the present invention;
Fig. 3 be describe in more detail among Fig. 2 the schematic block diagram of embodiment of link-quality humidification maker;
Fig. 4 is a schematic block diagram of describing another embodiment of the link-quality humidification maker among Fig. 2 in more detail;
Fig. 5 is the diagram that the throughput to throughput that can realize according to the present invention and prior art solution compares;
Fig. 6 is the schematic block diagram according to packet control unit of the present invention;
Fig. 7 is the flow chart of describing according to selection information generating method of the present invention;
Fig. 8 is a flow chart of describing the embodiment of the step that produces the link-quality humidification among Fig. 7 in more detail;
Fig. 9 is a flow chart of describing another embodiment of the step that produces the link-quality humidification among Fig. 7 in more detail; And
Figure 10 is a flow chart of describing the additional method step among Fig. 8.
Embodiment
In institute's drawings attached, identical reference symbol is used for corresponding or similar parts.
In some kinds of radio communications systems now, wherein used different modulation schemes or technology to modulate the data that those transmit on the Radio Communications Link via these systems.If there is multiple available modulation scheme, so, the selection that the modulation scheme that reality is used is carried out is normally based on the radio quality of communication link.What the present invention relates to then is that modulation scheme is selected.
According to the present invention, for using the mobile unit of multiple available modulation scheme, these mobile units can use link-quality or performance enhancement algorithms or technology to improve the link-quality that it meets with on communication link or channel.Yet this performance enhancement algorithms is only to operate a kind of or subclass in the available modulation scheme.This means can only for this/these specific modulation obtain the performance that this algorithm provides and strengthen, and can not strengthen for the performance that other modulation schemes be obtained this algorithm.In order accurately to select to be fit to the modulation scheme that mobile unit uses, be necessary this performance enhancing is taken in.The present invention has quoted a kind of like this modulation and has selected, and wherein said the selection to small part is that the performance that is experienced based on mobile unit strengthens.
Will describe and disclose the present invention with reference to a radio communications system hereinafter, wherein this system can use two kinds of possible modulation schemes, i.e. GMSK (Gaussian Minimum Shift Keying) and 8-PSK (eight attitude phase shift keyings).Yet, the present invention both had been not limited to this actual selection of modulation scheme, also be not limited to the system that can only use two kinds of modulation schemes, but go for using multiple, just at least two kinds of different modulation schemes come the general communication system to handling via the data of system's transmission.In addition, suppose also that in this example the performance enhancement algorithms is suitable and can act on those data by GMSK rather than 8-PSK modulation.Yet this example only is considered to be the exemplary case of an indefiniteness of the present invention, and this algorithm can be applied to 8-PSK and/or other modulation schemes equally, rather than GMSK.
Fig. 1 is the schematic diagram of a part that can use the radio communications system 1 of instruction of the present invention.In order to simplify accompanying drawing, the unit that the present invention directly relates to has only been described in Fig. 1.Radio communications system 1 can be GPRS (General Packet Radio System) system or EGPRS (Enhanced General Packet Radio Service) system that has adopted EDGE (enhanced data-rates of GSM evolution) technology.
In general, communication system 1 comprises a plurality of base station (BS) or basic transceiver station (BTS) 400,420 that communication link is provided for the mobile unit 100 that links to each other.These base stations 400,420 are typically connected to and are controlled by base station controller (BSC) 300 or radio network controller (RNC).BSC300 so comprise according to from the link quality measurements result of mobile unit 410 and/or base station 400,420 or estimate to select modulation scheme, for use in the function or the unit 200 of the communication link 410 that links to each other with mobile unit.In the figure, this modulation scheme selection unit still is not limited thereto with packet control unit (PCU) 200 expressions.
In operating process, mobile unit 100 is that (descending) communication link or channel 410 are carried out signal or link quality measurements by related with it base station 400.Link quality measure then is based on these measurements and is determined or estimates.Yet determined link quality measure also depends on the modulation scheme of using or using for the data that receive on link 410.In addition, link quality measure also depends on the operation of link-quality enhancement algorithms.Based on determined link quality measure and link-quality humidification, PCU200 can estimate one or more corresponding link quality metrics for one or more current and untapped modulation schemes.Be that communication link 410 is selected in the process of suitable modulation scheme, wherein will using these quality metrics (one or more quality metrics that quality metrics that mobile unit 100 is determined and PCU200 determine).
In prior art system, the selection of modulation scheme is to be carried out under the situation of the performance gain of not understanding enhancement algorithms and being produced by PCU200.Therefore, this prior art solutions might cause inappropriate modulation scheme selection, and this might cause the data that transmitted or radio blocks is lost or system's instability.
As an example of prior art solution potential problems, consider down link 410 transmission here, wherein the Modulation and Coding Scheme of current selection (MCS) is the GMSK modulation.To be suitable for enhancement algorithms and C/I enough high so that the Link Quality Reports that is used to indicate good GMSK quality from mobile unit 100 to be provided for the assumed wireless electrical environment in addition.Concerning not knowing that enhancement algorithms is the PCU200 of major reason of high GMSK link-quality, it can switch to 8-PSK.Because the unpromising 8-PSK of enhancement algorithms provides gain, therefore, receive from the new Link Quality Reports of mobile unit 100 and before recognizing this point and switching back the GMSK modulation, a lot of piece mistakes might occur and might lose a lot of pieces at PCU200.Then can occur intensive modulation system then and switch (ping-pong) back and forth, under the situation of worst, this will cause retransmitting about 50% piece.The present invention then can address this problem.
Fig. 2 is the schematic block diagram according to the embodiment of mobile unit 100 of the present invention.Mobile unit 100 comprises input and output (I/O) unit 110 that is used for external unit and station executive communication.Especially, this I/O unit 110 is configured to receive the radio blocks with modulating data from the base station that links to each other with mobile unit 110, and can come to transmit measurement report to the external unit of PCU and so on via the base station.
Preferably, each pulse train that 120 pairs of radio link measuring units receive or radio blocks are carried out link and are measured, and measure based on these and to produce first link quality measure.Replacedly, for instance, measuring unit 120 can be configured to every 1 radio blocks that receives, per 100 milliseconds or intermittently or periodically carry out signal measurement on other periodic intervals.
First link quality measure that is used for the modulation scheme of current use can be represented with other signals or link quality measure that BEP (BEP) or prior art are used.
In a preferred embodiment of the invention, link quality measure is that a plurality of pulse trains that receive or the average quality on the set period are measured, for example average BEP.It can be to measure for the different radio piece that receives has used the weighted average of different weights that this average quality is measured.In this case, with measurement that the radio blocks of nearest reception is associated in the weighting used more preferably greater than the respective weight of the radio blocks that early receives.Therefore, the average link quality of weighting is measured the current wireless electricity quality environment and the situation that as far as possible accurately reflect communication link.
Though radio link measuring appliance 120 is described as a link quality measure determining or estimate first modulation scheme of current use here, this measuring appliance 120 can also be determined a plurality of link quality measure of being associated with this first modulation scheme.For instance, this measures the variation coefficient that can comprise average BEP and BEP, and these two all depends on used modulation scheme.Therefore in the present invention, when discussion depended on the link quality measure of modulation scheme, this had wherein also comprised a plurality of correlated measures that are associated with the modulation scheme of appointment.
Hereinafter, suppose that the current modulation scheme that is used for communication link is GMSK, radio link measuring appliance 120 will be determined GMSK relevant link quality metrics so.Therefore, in this example, current and untapped modulation scheme will be 8-PSK.Yet this example only is considered to be exemplary embodiment, and the present invention is equally applicable to the current situation that 8-PSK or other modulation schemes is used to reach the down link data of mobile unit.
This mobile unit 100 can also use and be suitable for link-quality enhancement algorithms or the unit 130 that those use the data of available modulation scheme subclass modulation.For instance, link-quality enhancement algorithms 130 can only act on the GMSK modulating data, and can not act on the 8-PSK modulating data.Common this enhancement algorithms 130 allows to use the modulation scheme of appointments, even if do not use this algorithm will be owing to low excessively link-quality under the out of use radio condition at those.This means that algorithm 130 can strengthen the link-quality on the communication link that mobile unit 100 experienced in using one of the modulation scheme or the process of its certain subclass.For instance, enhancement unit 130 might produce the ability of inhibition link-quality enhancing or the interference of other functions.
Because quality enhancement algorithms 130 only is only applicable to certain subclass of available modulation scheme, therefore, it can have influence on this/link quality measure of these modulation schemes, but can not have influence on other modulation usually.This means if select not consider in the processing procedure that in modulation the link-quality that is obtained strengthens, might select the modulation of non-optimum so.
In addition, mobile unit 100 can also use the some kinds of different quality enhancement algorithms 130 that are applicable to the different subclass of modulation scheme.For instance, first quality strengthens can act on the GMSK modulating data, but can not act on the 8-PSK data, and second enhancement algorithms then only acts on the 8-PSK modulating data.In addition, multiple enhancement algorithms can also be applied to specified modulation here.Therefore, here the quality that described multiple algorithm configuration becomes to be used to make up can be strengthened, perhaps at the appointed time have only a kind of algorithm to operate.In this case, select usually and what use is the algorithm that produces biggest quality humidification.This judgement then can be carried out on each pulse train.
In addition, the gain of enhancement algorithms 130 or performance can also depend on the actual wireless electrical environment, for example the quantity of interference signal and relative intensity and/or traffic loads.This means if do not use the gain of current link-quality or strengthen, so the selection of modulation scheme even can be more unreliable.
The non-limiting example of this link-quality enhancement algorithms 130 that can use according to the present invention is single antenna interference cancellation techniques (SAIC) and single antenna Anti-Jamming Technique (SAIR).
For instance, when using GMSK to come modulated carrier or link, current SAIC algorithm has only provided performance gain.In addition, the quantity and the relative intensity that depend on interference signal from the gain of SAIC to a great extent.This means that some SAIC algorithm is current can be according to the version of radio environment and employed SAIC algorithm and with GMSK performance boost 0～9dB.Therefore, if selecting the processing procedure kind not use the SAIC gain, the uncertainty of the relative performance between GMSK and the 8-PSK will be up to 9dB so.Thus, under the situation of not understanding the SAIC performance, be difficult to carry out modulation scheme selection accurately.
Therefore, a link-quality humidification maker or generation unit 140 in mobile phone 100, have been realized, so that determine the quality humidification that operation produced of algorithm 130.Maker 140 can be defined as this type of humidification the performance gain that algorithm 130 is realized usually.This enhancing can be a plurality of radio blocks or the average gain on certain period, for example from last generation measurement report and the average gain since sending it to PCU.
Because enhancement algorithms 130 can activate in some pulse train and stop using in other pulse trains usually; therefore; mobile unit 100 can only be selected to use to gain from all enhancings with the received pulse string of the modulation scheme modulation that is associated with algorithm and link-quality and estimate link-quality, and can not use the enhancing gain from the pulse train of those these algorithms of having stopped using.Then, these two kinds of link-qualities can be used for determining the performance gain of algorithm 130.
If there are a plurality of enhancement algorithms 130 of running simultaneously, maker 140 is preferably determined its total quality humidifications that finally obtain or is each respective algorithms 130 definite its independent humidification so.
Here further be pointed out that, because enhancement algorithms 130 only is only applicable to the data that those subclass of using available modulation scheme are modulated, therefore, when modulating reception data (radio blocks) with one of algorithm 130 unaccommodated other modulation schemes, maker 140 normally can not operate.
Then, measuring appliance 120 is determined has determined (GMSK) link-qualities and will be brought to determination information maker or generation unit 150 from the link-quality humidification of maker 140.This maker 150 will and strengthen data based on quality metrics and determine to judge or selection information.For example, selection information can be included in GMSK relevant link quality metrics of determining under the situation of active link quality enhancement algorithms 130 and the enhancing value (from maker 140) that is produced.Replacedly, this information is included in GMSK relevant link quality metrics of determining under the situation of active link quality enhancement algorithms 130 and the GMSK relevant link quality metrics of determining under the situation of not using link-quality enhancement algorithms 130.
If what depend on that the link quality measure of modulation scheme mainly comprises is a plurality of values, for example mean value and deviate, maker 150 can be configured in the information production process, all these type of values are taken in so, perhaps only consider some or its some subclass in the described value, for example the average BEP value of modulation scheme.
Then, comparatively preferably use I/O unit 110 that the determination information that is produced is sent to external unit in the communication system, on behalf of the mobile unit that is connected, the PCU among for example Fig. 1, this unit will carry out modulation scheme selection.Thus, the determination information basis that formed the judgement in the external unit and selected to handle.
Each all is associated with different Modulation and Coding Scheme (MCS) to it is well known in the art that two kinds of modulation scheme 8-PSK and GMSK, and wherein said Modulation and Coding Scheme is used in system encoding by radioed data.With regard to modulation scheme selection, depend on the radio link quality measurement usually at the appropriate actual selection that MCS carried out.This means that determination information also can be used for being chosen in the appropriate MCS that uses on the down link that links to each other with mobile unit 100.
Link-quality humidification maker 140 and determination information maker 150 maybe may also have radio link measuring appliance 120 all can realize in the mobile unit 100 inner modulation scheme management unit of installing 160, so that produce determination information.
The combination that the unit 110～150 of mobile unit 100 can be used as software, hardware or software and hardware realizes.
Fig. 3 is the schematic block diagram of the embodiment of the link-quality humidification maker 140 among Fig. 2.In this embodiment, the link-quality about one or more modulation schemes that enhancement algorithms was suitable for is not activate this algorithm and determining under the situation of this algorithm of operation.This means usually will for this/these modulation schemes determine two link quality measure, wherein, that determines under the situation of activation algorithm measures normally preferably one and measures, and that is to say, if represent to measure with BEP, so above-mentioned measuring is less one and measures.Link-quality comparator or comparing unit 142 realize that in humidification maker 140 it is used to regard to certain modulation scheme these two link quality measure be compared.The link-quality humidification can be represented with difference between the quality metrics or ratio therebetween.
The combination that the unit 142 of link-quality humidification maker 140 can be used as software, hardware or software and hardware realizes.Unit 142 can be realized in maker 140.Yet distributed execution mode is possible equally, and wherein unit 142 is other local realizations the in mobile unit.
Fig. 4 is the schematic block diagram of another embodiment of the link-quality humidification maker 140 among Fig. 2.This embodiment has comprised an algorithm activate counter 144.As indicated above, the link-quality enhancement algorithms normally activates in some pulse train that receives or radio blocks, and not can other pulse train or piece in activate.For instance, SAIC is potential may activate in the GMSK modulation radio piece that all receive.Yet because the external radio environment condition influence is not producing any performance enhancing or worsening under the situation of link-quality, SAIC normally stops using.Count by the quantity to the potential radio blocks of activation algorithm, counter 144 can be determined an activity ratio.For instance, this activity ratio can be defined as activation algorithm radio blocks quantity and actual can activation algorithm total number of blocks, just all in the situation of SAIC receive GMSK pieces, the result of being divided by,
Activity ratio can be (roughly) indication of the link-quality humidification of algorithm generation.Alternatively, activity ratio can also be replenished with the average performance gain data that algorithm operating obtained, so that the more accurate quality humidification of definition.Replacedly, also can carry out laboratory measurement here, so that determine the pairing performance gain of certain activity ratio with average mode.For instance, 75% activity ratio can be used to represent the gain of 7dB, and perhaps for instance, the appointment average gain of 7dB can be represented with activity ratio interval 100-75%.This means that this algorithm can produce the link-quality humidification of 7dB in this exemplary embodiment so if counter 144 determines that this ratio is 83%.
The combination that the unit 144 of link-quality humidification maker 140 can be used as software, hardware or software and hardware realizes.Unit 144 can be realized in maker 140.Yet distributed execution mode is possible equally, and wherein unit 144 is other local realizations the in mobile unit.
In order to describe the advantage of this embodiment of the present invention, will carry out link simulation here.With reference to the diagram among the figure 5, wherein emulation three kinds of different situations.In the first prior art example, shown in solid line among the figure, mobile unit (receiver) does not have SAIC.This link adaptation is very desirable, that is to say, can select optimum modulation scheme and MCS here all the time.In the second prior art example, as have shown in the dotted line of star, receiver has that only modulation has the SAIC that about 8dB gains for GMSK.In network (PCU), identical in the adaptation algorithm of supposing link and the example 1, that is to say that this algorithm is reported based on the BEP relevant with GMSK and selected modulation scheme and MCS, and and do not know that there is difference in the relative performance of GMSK and 8-PSK.Therefore, this link adaptation is unsatisfactory concerning the mobile unit with SAIC ability.In example 3 of the present invention, receiver has gain and is about the 8dB SAIC of (only relating to the GMSK modulation).Mobile unit can be notified to PCU with GMSK and SAIC gain.This means the situation of supposition for the 8dBSAIC gain, the link adaptation that is adopted is very desirable, that is to say, all can select optimum modulation scheme and MCS here all the time.
In addition, in these examples, do not use incremental redundancy (IR), and hypothesis can retransmit by any MCS.And all emulation are all carried out at static channel.
Can obviously find out by the example in the comparison diagram 53 and 2,, will lose most SAIC gain so if use is the link adaptation that does not have accurately to understand the relative performance difference between GMSK and the 8-PSK.In addition, for example 2,4 and 9dB between the zone in, even compare with example 1, its performance has also descended about 50%.From following example, be appreciated that this decreased performance.That suppose that C/I is that 7dB and downlink transmission use is GMSK MCS.Support the mobile unit of SAIC will report that very good BEP measures (approaching zero defect receives).In case receive good measurement report, network or PCU will suppose that good BEP is produced by very high C/I (owing to the SAIC gain of 8dB, so it exceeds 8dB than actual C/I).Therefore, PCU will switch to the 8-PSK MCS optimum at the C/I=7+8=15dB place, for example MCS-7.When receiving the MCS-7 piece, throughput will drop to (approaching) zero.Mobile unit will be estimated the BEP of 8-PSK piece and send report to PCU.Under the situation that has read this report, PCU will recognize (correctly) that present C/I is 7dB.Under the situation of not understanding the SAIC performance, PCU can select for not having the SAIC ability and being in optimum MCS, for example MCS-2 for the mobile unit of described C/I.When receiving the MCS-2 piece, reception will be (approaching) zero defect, and throughput then is in the maximum of MCS-2.Mobile unit will be reported very good BEP once more, and this process will repeat.Consequently, under the situation that SAIC activates, although MCS-4 is best at for example C/I=7dB place, wave between MCS-2 and MCS-7 at the selection meeting that MCS carried out, consequent is only to be half average throughput of the peak throughput of MCS-2.
On behalf of mobile unit, Fig. 6 in network carry out the schematic block diagram of the unit 200 of modulation scheme selection.In the figure, this unit is represented with packet control unit 200, but is not limited thereto.PCU 200 comprises and is used for the I/O unit 210 that communicates with external unit.Especially, I/O unit 210 is configured to receive links quality measurement reports from the mobile unit that links to each other with communication system.
Optionally measure request generator 220 and realize that in PCU200 it is used to produce request message, this message can be sent to mobile unit by I/O unit 210, may be via the base station.Maker 220 can be configured to intermittence or periodic manner to produce these reports.Yet,, can from PCU200, omit this maker 220 so if mobile unit transmits this type of report from trend PCU200 under the situation that does not need the request that receives.
PCU200 also comprises link quality valuator 230, and it is used for mobile unit and untapped one or more modulation schemes are estimated corresponding one or more link quality measure, i.e. 8-PSK relevant link quality metrics in this example.This estimator 130 is configured to estimate 8-PSK relevant link quality metrics according to the determination information that receives in the measurement report from mobile unit.GMSK relevant link quality metrics and link-quality humidification produce because this determination information is based on, so this 8-PSK quality metrics is based on, and GMSK quality metrics and quality humidification estimate.
In first embodiment, link quality valuator 230 is configured to 8-PSK modulation and produces as GMSK respective link quality metrics measurement is measured.This means that if the GMSK correlated measure is represented with BEP estimator 230 will produce the relevant BEP value of 8-PSK according to determination information so.Correspondingly, if change into the GMSK metric table is shown as average BEP and deviation factor, estimator 230 will produce relevant average BEP of 8-PSK and deviation factor so.
Replacedly, link quality valuator 230 is configured to and does not use the 8-PSK link-quality to produce not as detailed the measuring of currently used GMSK modulation.For instance, if the GMSK link quality measure in the determination information represents that with average BEP and deviation factor it can only be the BEP value that so corresponding 8-PSK measures.Replacedly, single 8-PSK correlation can be used for representing the interval of GMSK link quality values.For instance, if determined GMSK correlated measure is in X at interval
1＜GMSK measures＜X
2In, and X
1＜X
2Be real number, estimate that so the corresponding 8-PSK correlated measure that obtains should be Y
1Yet, if X
2＜GMSK measures＜x
3, should select Y so
2As 8-PSK correlated measure, wherein X
3, Y
1, Y
2It all is real number.
In some communication system, the maximum transmission power level of the radio blocks of use GMSK modulation can be different from the maximum transmission power level of the radio blocks that uses the 8-PSK modulation.This one of them reason is, for 8-PSK, and the power amplifier in the base station transmitter non-linear more strict usually.Optionally power command maker 240 can to the base station transmitting power level request of mobile unit communication.This request impels the base station that the power level data are returned to PCU200.Then, the base station can report to PCU200 with the corresponding level that is used for the power level of GMSK and is used for 8-PSK.Replacedly, the magnitude of power of deriving from these power levels can be delivered to PCU200, wherein for instance, described magnitude of power can be ratio, the difference therebetween between GMSK power level and the 8-PSK power level or other numerical value of therefrom deriving.Then, estimator 230 can be according to the link quality measure of these power datas that receive modifications from mobile unit, perhaps otherwise in estimating processing procedure, use power data, estimate so that obtain more accurate quality, can rely on described quality to estimate to carry out more accurate modulation scheme selection thus.
Estimator 230 can use link-quality mapping or the form 260 of having enumerated different 8-PSK and GMSK link quality values.Then, this form 260 allows to shine upon between the relevant mass value of different modulation or change.Thus, concerning the GMSK mass value of appointment, form 260 comprises corresponding 8-PSK value, and vice versa.This means that estimator 230 can be carried out and search, and retrieves corresponding 8-PSK link quality measure when estimator 130 receives determination information from I/O unit 210 in form 260.
Replacedly, form 260 is omissible, and estimator 130 can change use link-quality mapping or transfer algorithm or function into.Therefore, this function will have from mobile unit and as the determination information of input parameter, preferably GMSK relevant link quality metrics and link-quality humidification of this information wherein, and this function will be exported corresponding 8-PSK quality metrics.In this function, can also use other input parameters,, measure so that obtain the 8-PSK that more accurate estimation obtains for example from the power level data of base station.If it is with two value representations that GMSK measures, this function can be exported single or two 8-PSK values so.In addition, this function can also be used for converting the GMSK value to the 8-PSK value, and vice versa.Replacedly, if can use two or more modulation schemes, can in estimator 130, implement some kinds of different transfer functions so.
Preferably, mapping table 260 and/or above-mentioned function are based on that the average ability of mobile unit produces, and especially produce based on the modulation scheme that can use in mobile unit.This form or function can measured laboratory measurement and/or different mobile unit on emulation produce, also can produce based on modulation software of implementing in the unit and/or hardware.
In the first embodiment of the present invention, form 260 or function are configured to the possible different transmission power level of GMSK and 8-PSK modulation is taken in.This means that form 260 can enumerate several 8-PSK values for each GMSK value, but this is to enumerate for the different value of power level numerical value.Replacedly, in case retrieve the value of 8-PSK from form 260, estimator 230 can be revised this value based on power level numerical value so.
Replacedly, link quality valuator 230 and/or form 260 can provide in the place of other except that PCU200 in communication network.Yet so, measure from the estimated quality of this outside estimator and will be sent to PCU200.
Will be forwarded to modulation scheme selection device 250 from the determination information of mobile unit and one or more link quality measure of current one or more modulation of in mobile unit-base station communication, not using.This selector 250 will be chosen in the modulation scheme of using on (down link) channel that is connected to mobile unit according to this input information and data.
It is well known in the art that these two kinds of modulation scheme 8-PSK and GMSK are associated with different Modulation and Coding Scheme (MCS), wherein said Modulation and Coding Scheme is used in system encoding by radioed data.With regard to modulation scheme selection, depend on the radio link quality measurement usually at the appropriate actual selection that MCS carried out.This means that selector 250 can be configured to be chosen in the appropriate MCS that uses on the down link that is connected to mobile unit according to one or more link quality measure that determination information and estimation obtain.
The combination that the unit 210～250 of PCU 200 can be used as software, hardware or software and hardware realizes.All inner realizations of the PCU200 in the individual node of communication network of unit 210～260.Yet distributed execution mode is possible equally, and wherein the unit 210～260th, provide at different network nodes.For instance, the function of maker 240 can realize in different base stations.
Fig. 7 be describe be used to produce judge or selection information so that be the flow chart of the method for mobile unit selection modulation scheme.This method starts from step S1, and wherein mobile unit can be carried out signal or the link quality measurements that depends on modulation scheme to the radio blocks or the pulse train that receive from the base station on communication link.Based on these measurements, can determine the link quality measure of presently used modulation scheme (modulation scheme 1).At following step S2, wherein will produce the link-quality humidification for acting on those quality enhancement algorithms with the data of current modulation scheme modulation.At last, at step S3, the link-quality humidification that obtains based on determined link quality measure and estimation produces determination information.This information will be used to select appropriate modulation scheme and/or MSC, so that use for mobile unit.Then, this method will finish.
Fig. 8 is a flow chart of describing the humidification generation step embodiment among Fig. 7.This method begins to continue from step S1.At following step S10, the link-quality of definite one or more modulation schemes that are associated with this algorithm under the situation that does not activate enhancement algorithms.Step S11 can compare this unactivated link-quality with the respective link quality metrics that is used for identical modulation and obtain under the situation of this algorithm running.Now, based on these two link quality measure, can determine that link-quality strengthens gain.Then, this method will proceed to step S3.
Fig. 9 is a flow chart of describing another embodiment of the humidification generation step among Fig. 7.This method continues from step S1.At following step S20, determine the activity ratio of enhancement algorithms.This ratio is typically expressed as the result that the quantity of the pulse train of activation algorithm wherein and the sum of potential pulse train that might activation algorithm wherein are divided by.Based on this activity ratio, can estimate the link-quality humidification at least here, and may can also estimate other data, for example the average enhancing gain of algorithm.
Figure 10 is a flow chart of describing the additional step of the method among Fig. 7.This method is proceeded from step S3.At following step S30, the determination information that is produced is reported to the unit of carrying out the modulation selection in the communication network, for example PCU.This report is to be sent to PCU with intermittence or periodic mode.Replacedly or replenish, this report is to transmit when receiving from the request of PCU.In PCU, the determination information that receives will be used to one or more link quality measure of current and untapped one or more modulation schemes of estimated mobile unit.Then, one or more quality metrics of obtaining of this determination information and estimation will be used to select modulation scheme and/or the MCS that the communication link for mobile unit uses.
It should be appreciated by those skilled in the art that under the situation of the invention scope that does not break away from the claims qualification, can carry out different modifications and changes the present invention.
Claims (21)
1. one kind is used for producing determination information so that select the method for a modulation scheme at radio communications system (1) from the multiple modulation scheme that can use for mobile unit (100), described mobile unit (100) is adapted to the link-quality that serviceability enhancement algorithms (130) strengthens the communication link (410) of a scheme subclass having used described multiple modulation scheme, and described method comprises step:
Described mobile unit (100) is for to have used the described communication link (410) of first modulation scheme in the described scheme subclass to determine the first modulation scheme relevant link quality;
The humidification of the link quality performance humidification that described mobile unit (100) the described performance enhancement algorithms of generation (130) is caused is represented; And
Represent to produce described determination information based on described first modulation scheme relevant link quality and described humidification.
2. according to the process of claim 1 wherein, described mobile unit determines that the described step of the first modulation scheme relevant link quality may further comprise the steps:
Described mobile unit (100) is to measuring with described first modulation scheme modulation and in the data that described communication link (410) upward receives;
Described mobile unit (100) is determined the described first modulation scheme relevant link quality based on described measurement.
3. according to the process of claim 1 wherein, the described step that described mobile unit (100) generation humidification is represented may further comprise the steps:
Described mobile unit (100) is estimated the relevant link-quality of second modulation for described first modulation scheme under the situation of not using described performance enhancement algorithms (130);
Described mobile unit (100) produces described humidification based on the described first modulation scheme relevant link quality and the relevant link-quality of described second modulation and represents.
4. according to the process of claim 1 wherein, the described step that described mobile unit (100) generates comprises step: described mobile unit (100) is determined the utilization rate of described performance enhancement algorithms (130), and described humidification represents to have comprised described utilization rate.
5. according to the process of claim 1 wherein, described performance enhancement algorithms (130) is an interference suppression algorithm.
6. according to the method for claim 1, further comprising the steps of: described mobile unit (100) represents to report to modulation scheme selection unit (200) in the described radio communications system (1) with the described first modulation scheme relevant link quality and described humidification.
7. according to the method for any one claim among the claim 1-6, wherein, in the described multiple modulation scheme each all is associated the unique transmission power level of data passes to described mobile unit (100) with being used for going up at described communication link (410), said method comprising the steps of:
Determine first transmission power level that current and described first modulation scheme is associated;
Definite corresponding second transmission power level that is associated with at least one second modulation scheme;
Wherein said determination information comprises at least one in the following content:
Described first transmission power level and described second transmission power level; And
The quantity of from described first transmission power level and described second transmission power level, deriving.
8. one kind is used for producing determination information so that select the mobile unit (100) of a modulation scheme at radio communications system (1) from a plurality of available modulation schemes, and described mobile unit (100) comprising:
Performance intensifier (130) is used to strengthen the link-quality of the communication link (410) of a scheme subclass having used described a plurality of available modulation schemes;
Be used to the described communication link (410) that uses first modulation scheme in the described scheme subclass to determine definite device (120) of the first modulation scheme relevant link quality;
Be used to produce the humidification that the humidification of the link quality performance humidification that described performance intensifier (130) work caused represents and represent generating apparatus (140); And
Be used for representing to produce the device (150) of described determination information according to the described first modulation scheme relevant link quality and described humidification.
9. mobile unit according to Claim 8, also comprise: be used for going up the receiving system (110) that receives the data of using described first modulation scheme modulation at described communication link (410), wherein said definite device (120) is configured to carry out the link quality measurements of described data, and described data are used described first modulation scheme modulation and received by described receiving system (110).
10. mobile unit according to Claim 8, also comprise the device (120) that is used for not having to estimate for described first modulation scheme under the situation of work at described performance intensifier (130) the relevant link-quality of second modulation, wherein said humidification represents that generating apparatus (140) is configured to determine that according to the described first modulation scheme relevant link quality and the relevant link-quality of described second modulation described humidification represents.
11. mobile unit according to Claim 8, wherein, described humidification represents that generating apparatus (140) is configured to determine the activity ratio of described performance intensifier (130), and described humidification represents to have comprised described activity ratio.
12. mobile unit according to Claim 8, described performance intensifier (130) is configured to use interference suppression algorithm to strengthen link-quality.
13. the mobile unit of any one claim according to Claim 8-12 also comprises:
Be used for the device (110) of reception from the link quality measurements request of the modulation scheme selection unit (200) of described radio communications system (1); And
Be used for when receiving described request, described determination information being reported to the device (110) of described modulation scheme selection unit (200).
14. one kind is used for producing determination information so that in the modulation scheme management unit (160) of radio communications system (1) a kind of modulation scheme of selection from a plurality of available modulation scheme that can use for mobile unit (100), described modulation scheme management unit (160) comprising:
Be used to the communication link (410) of the described mobile unit (100) that uses first modulation scheme that the generator (120) of the first modulation scheme relevant link quality is provided;
Be used to produce the humidification that the humidification of the link quality performance humidification that performance enhancement algorithms (130) operation caused represents and represent generating apparatus (140), wherein said performance enhancement algorithms (130) is suitable for strengthening the link-quality of the described communication link (410) of a scheme subclass having used described a plurality of available modulation schemes, and described scheme subclass has comprised described first modulation scheme; And
Be used for representing to produce the device (150) of described determination information according to the described first modulation scheme relevant link quality and described humidification.
15. modulation scheme management unit according to claim 14, also comprise and be used for going up the receiving system (110) that receives the data of using described first modulation scheme modulation at described communication link (410), wherein said generator (120) is configured to determine that based on the link quality measurements of described data described link-quality, described data use described first modulation scheme to modulate and received by described receiving system (110).
16. modulation scheme management unit according to claim 14 or 15, also comprise the device (120) that is used for estimating for described first modulation scheme relevant link-quality of second modulation under described performance enhancement algorithms (130) and off-duty situation, wherein said humidification represents that generating apparatus (140) is configured to produce described humidification based on the described first modulation scheme relevant link quality and the relevant link-quality of described second modulation and represents.
17. modulation scheme management unit according to claim 14 or 15, wherein, described humidification represents that generating apparatus (140) is configured to determine the activity ratio of described performance enhancement algorithms (130), and wherein said humidification represents to have comprised described activity ratio.
18. modulation scheme selection unit (200) that is installed in the radio communications system (1), this unit is used for from selecting a modulation scheme for a plurality of modulation schemes that mobile unit (100) uses, wherein said mobile unit (100) then is adapted to the link-quality that serviceability enhancement algorithms (130) strengthens the communication link (410) of a scheme subclass having used described a plurality of modulation schemes, and described modulation scheme selection unit (200) comprising:
Be used for receiving the device (210) of the determination information that comes from described mobile unit (100), described determination information has comprised the first modulation scheme relevant link quality that the described communication link (410) that uses first modulation scheme in the described scheme subclass is had, and the humidification of the link quality performance humidification that caused of described performance enhancement algorithms (130) is represented; And
Be used for selecting the choice device (250) of the modulation scheme used for the described communication link (410) that is connected to described mobile unit (100) according to described determination information.
19. modulation scheme selection unit according to claim 18, comprise also being used for to estimate the estimation unit (230) of the second modulation scheme relevant link quality according to described determination information that wherein said choice device (250) is configured to select modulation scheme according to described second modulation scheme relevant link quality and described determination information at least one second modulation scheme.
20. modulation scheme selection unit according to claim 19, wherein, described estimation unit (230) is configured to use definite described second modulation scheme relevant link quality the form (260) of described determination information as different modulation schemes mapping link-quality from one.
21. modulation scheme selection unit according to claim 19, wherein, in described a plurality of modulation scheme each all is associated with the unique transmission power level that is used in that described communication link (410) is gone up to described mobile unit (100) Data transmission, described modulation scheme selection unit (200) has comprised the base station (400) that is used for from transmit described data to described mobile unit (100) and has received the device (210) that through-put power is measured, and wherein said through-put power is measured at least one that is selected from the following content:
First transmission power level that current and described first modulation scheme is associated and second transmission power level that is associated with at least one second modulation scheme; And
The quantity of deriving from described first transmission power level and described second transmission power level and obtaining, wherein said estimation unit (230) are configured to measure based on described through-put power estimates the described second modulation scheme relevant link quality.
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| US50069103P | 2003-09-08 | 2003-09-08 | |
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| US10/857,359 | 2004-06-01 |
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| CN101227253B (en) * | 2008-02-01 | 2013-02-27 | 中兴通讯股份有限公司 | Dynamic state altering method of enhancement type general use grouping wireless business encoder mode |
| US8885617B2 (en) * | 2012-09-05 | 2014-11-11 | Qualcomm Incorporated | Methods and devices for employing a modulation and coding scheme for a data block |
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