CN102970717A - Method and device for switching different downlink transmission modes of LTE (long term evolution) system - Google Patents
Method and device for switching different downlink transmission modes of LTE (long term evolution) system Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for switching different downlink transmission modes of an LTE (long term evolution) system. The method comprises the following steps of: acquiring a rank indication and a channel quality indication, and looking up a channel quality indication and spectrum effectiveness comparison table to obtain spectrum effectiveness according to the channel quality indication; and judging whether the rank indication and the spectrum effectiveness meet preset conditions, and if so, switching a current downlink transmission mode into a target downlink transmission mode. The embodiment of the invention also discloses a device for switching the different downlink transmission modes of the LTE system. According to the embodiment of the invention, the downlink transmission modes can be self-adaptively switched according to the actual channel condition of a terminal, therefore, the spectrum effectiveness of a downlink link is improved, and the stability of transmission is kept.
Description
Technical field
The application relates to LTE (Long Term Evolution, Long Term Evolution project) systems technology field, particularly changing method and the corresponding intrument thereof between the different downlink transfer patterns of LTE system.
Background technology
Along with the gradually growth of mobile subscriber's quantity, service of mobile communication is upgraded day by day.3GPP (3rd Generation Partnership Project, third generation partner program) adapts to the reality technology needs, has proposed the LTE system, with its standard as future mobile communications.The adoptable multiple transmission mode of PDSCH (Physical Downlink Shared Channel, physical down link sharing channel) of having stipulated the LTE system in the standard agreement of LTE system (is labeled as TMn, comprises TM1～TM9).The different situations of different downlink transfer mode adaptives, such as, correlation is large and signal to noise ratio is lower when between transmission channel, perhaps UE (User Equipment, subscriber equipment) translational speed is too high when causing channel degradation, can consider to switch to that (such as TM3) transmits under the transmission mode that MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) mode has transmit diversity; When transmission channel is in perfect condition or inter-channel correlation hour, can consider to switch to that (such as TM4) transmits under the transmission mode that the MIMO mode has spatial reuse.In order to maximize the downlink tone spectrum efficiency, strengthen transmission stability, usually need between multiple downlink transfer pattern, switch according to environmental factor.
The method of switching between the different downlink transfer patterns of a kind of LTE system that prior art provides is: receive first channel information and velocity information that UE reports, judge whether to satisfy the transmission mode switching condition according to the current transmission mode of UE and described channel information again, if satisfy the transmission mode switching condition, then according to velocity information UE is switched to the object transmission pattern from current transmission mode.This changing method can be realized the switching between different downlink transfer patterns to a certain extent.
Yet, because the switching of this changing method is according to the channel quality information and the velocity information that report for UE, and these two information and UE type, measurement capability are relevant, even if identical channel quality and speed, the result who is obtained by different UEs is also with difference, thereby the switching reliability between the downlink transfer pattern that causes carrying out according to these parameters is not high, is unfavorable for maximizing the downlink tone spectrum efficiency and strengthens transmission stability.In addition, because this changing method is considered velocity information, and some occasion is to speed and insensitive (such as indoor environment), thereby limited the range of application of this switching mode.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides changing method and the related device thereof between the different downlink transfer patterns of a kind of LTE system, improving the reliability of switching between the downlink transfer pattern, and then improve the downlink tone spectrum efficiency and strengthen the transmission stationarity.
Changing method between the different downlink transfer patterns of the LTE system that the embodiment of the present application provides comprises:
Obtain order indication, and obtain the channel quality indication, and indication is searched the corresponding table with spectrum efficiency of channel quality indication and obtained spectrum efficiency according to channel quality;
It is pre-conditioned to judge whether described order indication and spectrum efficiency satisfy, and if so, then current downlink transfer pattern is switched to the target downlink transmission mode.
Preferably, described method also comprises:
Adjust according to default regulation rule according to Block Error Rate and/or HARQ number of retransmissions searching the spectrum efficiency that the corresponding table with spectrum efficiency of channel quality indication obtains, then described judge order indication and spectrum efficiency whether satisfy pre-conditioned be judge that order is indicated and adjustment after spectrum efficiency whether satisfy pre-conditioned.
Preferably, describedly judge whether order indication and spectrum efficiency satisfy pre-conditioned comprising:
Judge that described order indication equals the first preset value or the second preset value, described the first preset value and the second preset value are the code word number of the MIMO mode of current downlink transfer pattern;
When the order indication equaled the first preset value, the code word number of judging the MIMO mode of current downlink transfer pattern is whether the state of the first preset value exceeds the first Preset Time, and was described pre-conditioned for exceeding the first Preset Time;
When the order indication equals the second preset value, whether judge the spectrum efficiency of current downlink mode less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values, described pre-conditioned be that the spectrum efficiency of current downlink transfer pattern is less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values.
Further preferably, when the order indication equals the second preset value, described method also comprises: the code word number of judging the MIMO mode of current downlink transfer pattern is whether the state of the second preset value surpasses the second Preset Time, and exceed the second Preset Time described pre-conditioned also comprising.
Preferably, when the indication of described order and spectrum efficiency satisfy pre-conditioned, with current downlink transfer pattern switch to the target downlink transmission mode during, 1A keeps transfer of data to the user equipment allocation resource by the down link control information form.
Further preferably, describedly keep transfer of data by down link control information form 1A to the user equipment allocation resource and be specially by down link control information form 1A and keep transfer of data to the user equipment allocation resource in the transmit diversity mode.
Preferably, described method also comprises:
Filtering is carried out in indication to order after obtaining order indication, describedly judges whether rank indication information and spectrum efficiency satisfy pre-conditioned being specially and judge whether satisfy pre-conditioned through filtered order indication and spectrum efficiency.
The embodiment of the present application also provides the switching device shifter between the different downlink transfer patterns of a kind of LTE system.This device comprises: information acquisition unit, condition judgment unit and transmission mode switch unit, wherein:
Described information acquisition unit is used for obtaining the order indication, and obtains the channel quality indication, and indication is searched the corresponding table with spectrum efficiency of channel quality indication and obtained spectrum efficiency according to channel quality;
Described condition judgment unit, it is pre-conditioned to be used for judging whether described order indication and spectrum efficiency satisfy, and if so, then triggers the transmission mode switch unit;
Described transmission mode switch unit is used for current downlink transfer pattern is switched to the target downlink transmission mode.
Preferably, described device also comprises adjustment unit, be used for searching the spectrum efficiency that the corresponding table with spectrum efficiency of channel quality indication obtains and adjust according to default regulation rule according to Block Error Rate and/or HARQ number of retransmissions, then described condition judgment unit specifically for judge that order is indicated and adjustment after spectrum efficiency whether satisfy pre-conditioned.
Preferably, described condition judgment unit comprises the first judgment sub-unit, the second judgment sub-unit and the 3rd judgment sub-unit;
Described the first judgment sub-unit is used for judging that described order indication equals the first preset value or the second preset value, and described the first preset value and the second preset value are the code word number of the MIMO mode of current downlink transfer pattern; When the order indication equals the first preset value, trigger the second judgment sub-unit, when the order indication equals the second preset value, trigger the 3rd judgment sub-unit;
Described the second judgment sub-unit, the code word number that is used for judging the MIMO mode of current downlink transfer pattern are whether the state of the first preset value exceeds the first Preset Time, and be described pre-conditioned for exceeding the first Preset Time;
Described the 3rd judgment sub-unit, whether the spectrum efficiency that is used for judging current downlink mode less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values, described pre-conditioned be that the spectrum efficiency of current downlink transfer pattern is less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values.
Further preferably, described device also comprises the timer of setting the second Preset Time, described the 3rd judgment sub-unit then, the code word number that also is used for judging the MIMO mode of current downlink transfer pattern is whether the state of the second preset value surpasses the second Preset Time, and exceed the second Preset Time described pre-conditioned also comprising.
Preferably, described device also comprises resource allocation unit, be used for described order indication and spectrum efficiency satisfy pre-conditioned current downlink transfer pattern is switched to the target downlink transmission mode during, 1A keeps transfer of data to the user equipment allocation resource by the down link control information form.
Further preferably, described resource allocation unit specifically is used for keeping transfer of data to the user equipment allocation resource in the transmit diversity mode at down link control information form 1A.
Preferably, described device also comprises filter unit, is used for after obtaining the order indication to order indication and carries out filtering, and described condition judgment unit specifically is used for judging whether satisfy pre-conditioned through filtered order indication and spectrum efficiency.
The embodiment of the present application is obtained first rank indication information and frequency efficiency information, with its switching foundation of switching as the downlink transfer pattern, satisfying when pre-conditioned, realizes that current downlink transfer pattern is to the switching of target downlink transmission mode.Compared with prior art, the embodiment of the present application is when the switching of carrying out between LTE system different transmission mode, not only consider rank indication information, and consideration spectrum efficiency information, because spectrum efficiency information is not directly provided by UE, thereby so that the handoff procedure that carries out according to order indication and spectrum efficiency reliability more is conducive to maximize the downlink tone spectrum efficiency and strengthens and transmits stationarity.In addition, owing to no longer consider velocity information in the handoff procedure, make the scheme of the embodiment of the present application applicable to comprising that indoor this class is to the insensitive occasion of speed.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the application's the different downlink transfer pattern method for switching between embodiment of LTE system flow chart;
Fig. 2 is the downlink transfer pattern method for switching between flow chart of an example of the application's embodiment;
Fig. 3 is the structured flowchart of switching device shifter embodiment between the different downlink transfer patterns of LTE system.
Embodiment
In order to make those skilled in the art person understand better technical scheme among the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
Referring to Fig. 1, the figure shows the flow process that the LTE system of the embodiment of the present application is switched between different downlink transfer patterns.This embodiment comprises:
Step S101: obtain the order indication, and obtain the channel quality indication, indication is searched the corresponding table with spectrum efficiency of channel quality indication and is obtained spectrum efficiency according to channel quality;
Here " order indication " (Rank Indication, RI) is used to indicate the space number of plies that UE can support under certain channel condition, and this physical quantity can be obtained by multiple concrete mode, usually adopts to report mode to obtain by UE.In the actual application, indicate suddenly big or suddenly small appearance unstable for preventing order, switch saltus step between the different MIMO modes that cause carrying out according to this parameter or switch error, usually RI is carried out filtering operation, RI is remained in certain scope.
Here " spectrum efficiency " is called again the priori spectrum efficiency, and it can reflect the spectrum efficiency of LTE system comparatively truly.The mode of obtaining spectrum efficiency also has multiple, usually takes to obtain first the channel quality indicator (CQI) value, then searches the corresponding table with spectrum efficiency of CQI and obtains spectrum efficiency.The corresponding table with spectrum efficiency of CQI is 3GPP agreement prescriber forms, the usually corresponding spectrum efficiency of CQI value within the specific limits.In the actual application, based on the requirements at the higher level to switching reliability between different MIMO modes, need to obtain the higher spectrum efficiency of accuracy, the table look-up mode of the spectrum efficiency accuracy that obtains of a kind of raising is: the spectrum efficiency that obtains to table look-up is benchmark (hereinafter referred to as the benchmark spectrum efficiency), according to the physical link situation it is adjusted (spectrum efficiency after the adjustment is called again the posteriority spectrum efficiency), realizes that the detailed process of adjusting is different and different according to the factor of considering:
Such as, when the factor of considering for the physical link situation is Block Error Rate, can be according to (the Block Error Rate here just passes with HARQ and defines to the statistics of Block Error Rate, namely the mistake that retransmits is not taken statistics) adjust the benchmark spectrum efficiency: Block Error Rate is higher, then turn down the spectrum efficiency fiducial value, otherwise, then heighten the spectrum efficiency fiducial value, if this adjustment was carried out within a period of time, then can embody by accumulate mode, final spectrum efficiency that adjust to determine is judged whether to satisfy pre-conditioned foundation as follow-up.Step-length for each adjustment can be default fixed value, can present also that step-length is dwindled gradually or other rules such as increase, the step-length that the application preferably adjusts is the poor minimum value of spectrum efficiency corresponding between the adjacent MCS among each rank MCS (Modulation and Coding Scheme, modulation coding mode).This spectrum efficiency based on Block Error Rate is adjusted the change in long term that mode can be followed the tracks of channel, is applicable to the slow fading situation of channel.
For another example, when the factor of considering for the physical link situation is the HARQ number of retransmissions, can adjust the benchmark spectrum efficiency according to the statistics to the HARQ number of retransmissions: the HARQ number of retransmissions is more, then turn down the spectrum efficiency fiducial value, otherwise, then heighten the spectrum efficiency fiducial value, if this adjustment is carried out within a period of time, then can embody by accumulate mode, final spectrum efficiency that adjust to determine is judged whether to satisfy pre-conditioned foundation as follow-up.Step-length for each adjustment can be default fixed value, can present also that step-length is progressively dwindled or other rules such as increase, the application preferably adopts ladder step-length mechanism, namely when HARQ re-transmission the number of transmissions is 1 or 2, do not adjust, when number of retransmissions surpasses 2, number of times is more, adjusting range is larger, if it is still unsuccessful to reach maximum retransmission, then produces a upper limit adjusted value.Adopt the basis of this species stage step-length mechanism to be that the main purpose that such understanding: HARQ retransmits is to improve spectrum efficiency, when the HARQ that is higher than twice retransmitted, mainly " the burst factor " by Radio Link caused.This spectrum efficiency based on the HARQ number of retransmissions is adjusted the Short-term characteristic that mode can reflect channel, is applicable to the rapid fading situation of channel.
Also such as, according to the ACK/NACK feedback coefficient benchmark spectrum efficiency is adjusted.In the actual application, except above-mentioned these obtain the mode of posteriority spectrum efficiency according to single factor, many factors can also be integrated acquisition more accurately spectrum efficiency as the posteriority spectrum efficiency.Adjust according to Block Error Rate adjustment and HARQ number of retransmissions as the aforementioned, because the statistics of two adjustment is independent separately, reflect independently Consideration, directly addition of their result is carried out the adjustment of benchmark spectrum efficiency with the result after the addition as foundation.
Step S102: it is pre-conditioned to judge whether order indication and spectrum efficiency satisfy, and if so, then current downlink transfer pattern is switched to the target downlink transmission mode;
After obtaining order indication and spectrum efficiency by abovementioned steps, it is pre-conditioned to judge whether order indication and spectrum efficiency information satisfy, and in satisfied situation, carries out current transmission mode to the switching of object transmission pattern, otherwise, do not carry out handover operation.
Present embodiment obtains first rank indication information and frequency efficiency information, with its switching foundation of switching as the downlink transfer pattern, satisfying when pre-conditioned, realizes that current downlink transfer pattern is to the switching of target downlink transmission mode.Compared with prior art, the embodiment of the present application can obtain following technique effect at least: (1) since present embodiment when the switching of carrying out between LTE system different transmission mode, not only consider rank indication information, and consideration spectrum efficiency information, and spectrum efficiency information is not directly provided by UE, thereby so that the handoff procedure that carries out according to order indication and spectrum efficiency reliability more is conducive to maximize the downlink tone spectrum efficiency and strengthens and transmits stationarity.(2) because the handoff procedure of present embodiment is no longer considered velocity information, make the scheme of the embodiment of the present application applicable to comprising that indoor this class is to the insensitive occasion of speed.
For the judgment mode among the step S102 of above-described embodiment, the application is not particularly limited, and no matter adopts which kind of concrete judgment mode, as long as its basis for estimation is order indication and spectrum efficiency, does not all hinder the realization of the present application purpose.Yet in actual application, the application can preferably adopt following " two step determining methods " to judge:
Judge that first it still is the second preset value that order is designated as the first preset value, first preset value here and the second preset value are the code word number of the MIMO mode of current downlink transfer pattern.In actual application, its value is generally positive integer, such as, when the first preset value was 1, namely the code word number of the MIMO mode of current downlink transfer pattern was 1, the MIMO mode that current downlink transfer pattern is described is the single codeword transmission; When the second preset value was 2, namely the code word number of the MIMO mode of current downlink transfer pattern was 2, and the MIMO mode that current downlink transfer pattern is described is the transmission of dicode word.In the downlink transfer pattern of LTE system, some transmission mode comprises a plurality of MIMO modes, and these MIMO modes can be divided two classes: the one, and single codeword class, the one, dicode word class.Such as, transmission mode 3 (TM3) mainly comprises transmit diversity and two kinds of MIMO modes of Open-Loop Spatial Multiplexing, and the former is single codeword class MIMO mode, and the latter is dicode word class MIMO mode.After identifying order indication and the first preset value or the second preset value relation by judgement, carry out the second determining step according to different situations.
When the order indication equals the first preset value, the code word classification that current downlink transfer pattern is described is the single codeword transmission, whether the duration of at this moment further judging the single codeword state exceeds the first Preset Time, if exceed the first Preset Time, then think and satisfy switching condition between different downlink transfer patterns, current downlink transfer pattern can be switched to the target downlink transmission mode; Otherwise namely the duration of single codeword state does not exceed the first Preset Time, then need not to carry out the conversion of downlink transfer pattern.First Preset Time here can be set according to concrete suitable environment, and being set at of the first Preset Time avoided switching too frequently between too different downlink transfer patterns, causes the expense of signal resource to increase.When the order indication equals the second preset value, the code word classification that current downlink transfer pattern is described is the transmission of dicode word, whether the spectrum efficiency of at this moment further judging current downlink mode is less than the spectrum efficiency of target downlink transmission mode, if the spectrum efficiency less than the target downlink transmission mode, then think and satisfy switching condition between different downlink transfer patterns, current downlink transfer pattern can be switched to the target downlink transmission mode; Otherwise, need not to carry out the conversion of downlink transfer pattern.
In actual application, too frequent in order to prevent the switching between the different mode, for second case (the order indication equals the second preset value), also can set by timer the duration of dicode word state, when spectrum efficiency that duration of dicode word surpasses the second Preset Time and current downlink transfer pattern is only arranged less than the spectrum efficiency of target downlink transmission mode, just think the switching condition that satisfies different downlink transfer patterns, and then carry out by the switching of current transmission mode to the object transmission pattern, the setting of the second Preset Time not only can be avoided the frequent switching of different downlink transfer patterns, and the spectrum efficiency numerical value of statistics is tended towards stability, more stable spectrum efficiency has more actual application value as switching condition.The Preset Time of setting by timer can adopt " omnidistance default formula ", namely during system operation whole, all adopt identical Preset Time value, also can adopt " default first; the subsequent dynamic adjustment type ", namely after setting first a preset value, follow-up Preset Time length is adjusted according to the running situation self adaptation, such as, the Preset Time initial value of timer is made as 30s, within a period of time, switching times between pattern is counted, if switch frequently, then the duration of timer increases, if switch not frequently, the duration of timer suitably reduces.Also need to prove: under second case, not only can adopt this mode that the spectrum efficiency of current downlink transfer pattern is compared with the spectrum efficiency of target downlink transmission mode to determine and to switch, can also compare with the spectrum efficiency threshold values of presetting in advance by the spectrum efficiency with current downlink transfer pattern and decide and to switch.
By " two step determining methods " as above, the application is in the handoff procedure that carries out the different downlink transfer patterns of LTE system, the application not only between different transmission mode this level carry out pattern and switch, also take into full account the MIMO mode of same downlink transfer mode internal, realize the switching of downlink transfer pattern based on the different attribute of the MIMO mode in the current downlink transfer pattern, this when between downlink transfer pattern pattern, switching in conjunction with transmission mode in MIMO mode mode be conducive to improve to a greater degree the reliability of switching between transmission mode and strengthen to a greater degree transmission stability.
In the aforementioned embodiment, when pre-conditioned by judge confirming to satisfy, current downlink transfer pattern can being switched to and carrying out transfer of data under the target downlink transmission mode.Yet in actual application, the switching between this different mode must need to expend time in, and because propagation delay, end side is also different with the moment that base station side obtains switching command, might cause professional Transmission under this situation.For this problem, the application also provides the data transfer mode between a kind of transfer period between different downlink transfer patterns, that is: satisfy pre-conditioned when the indication of described order and spectrum efficiency, with current downlink transfer pattern switch to the target downlink transmission mode during, keep transfer of data by down link control information form 1A (DCI format 1A, Downlink Control Information format 1A) to the user equipment allocation resource.After the user equipment allocation resource, can adopt the transmit diversity mode to keep transfer of data.The reason that the application adopts this mode to keep transfer of data is: UE is not only at private space (the distinctive frequency range of each UE is interval) the search DCI format 1A corresponding with transmission mode, and at public space (the common frequency range of using of a plurality of UE is interval in the residential quarter) search DCI format1 A, the multiple downlink transfer pattern that the LTE system is comprised is all supported DCI format 1A, and then can utilize the data of this information format realization downlink transfer pattern between transfer period to keep.
In order to be illustrated more clearly in the technical scheme of the embodiment of the present application, the below describes with a detailed example.Referring to Fig. 2, the figure shows the flow process of this example.This example is used for being implemented in the switching between the transmission mode TM3/TM4, and its application scenarios is indoor environment.This example comprises:
Step S201: setting the initial downlink transmission mode is the single codeword transmit diversity mode of transmission mode 3.Because UE is when initially accessing, the parameters and unclear such as the channel conditions that base station side is used UE and UE grade are selected the downlink transfer pattern usually randomly.Here the reason that the initial downlink transmission mode is set as the single codeword mode of transmission mode 3 is: this example is used for indoor overlay environment, covering quality is guaranteed, consider under the situation of stability and throughput factor, transmission mode 3 is to select preferably, and the stability of the transmit diversity mode of transmission mode 3 is higher than spatial multiplexing mode.
Step S202: after beginning transmission, upgrade the order indication that UE reports, and according to channel quality indication statistics spectrum efficiency.Here " spectrum efficiency " is based on the spectrum efficiency that corresponding table that CQI searches CQI and spectrum efficiency obtains.In addition, this spectrum efficiency can also be adjusted adaptively according to link condition, with the spectrum efficiency after adjusting as the condition of switching between different downlink transfer patterns.
Step S203: the switching condition according to the MIMO mode in the downlink transfer mode 3 judges whether that needs switch to the spatial multiplexing mode of the dicode word of transmission mode 3, if satisfy condition, and execution in step S204 then; If do not satisfy condition, then return step S201.
Step S204: switch to the dicode word space multiplex mode transmission of transmission mode 3, and the spectrum efficiency under the statistics transmission mode 3 dicode word situations, start the first timer timing.
Step S205: whether whether the spectrum efficiency of dicode word of judging transmission mode 3 overtime less than spectrum efficiency and the first timer of transmission mode 4, and if so, then execution in step S206 if not, then returns step S204.
Step S206: the single codeword transmit diversity mode that switches to transmission mode 4.Because the handoff procedure between the downlink transfer pattern of this example adopts single codeword transmit diversity mode to transmit usually, therefore, when transmission mode 3 switched to transmission mode 4, the single codeword transmit diversity mode of selection transmission mode 4 is transmission means by default.
Step S207: the switching condition according to the MIMO mode in the downlink transfer pattern 4 judges whether that needs switch to the spatial multiplexing mode of the dicode word of transmission mode 4, if satisfy condition, and execution in step S208 then, if not, execution in step S206 then.
Step S208: switch to the dicode word space multiplex mode transmission of transmission mode 4, and the spectrum efficiency under the dicode word situation of statistics transmission mode 4, start the second timer timing.
Step S209: whether whether the spectrum efficiency of dicode word of judging transmission mode 4 overtime less than spectrum efficiency and the second timer of transmission mode 3, if so, then returns step S201, if not, then returns step S208.
Above content is the description to the application's embodiment of the method, and correspondingly, the application also provides device embodiment.Referring to Fig. 3, the figure shows the structure of the switching device shifter embodiment between the different downlink transfer patterns of LTE system.This device embodiment comprises: information acquisition unit 301, condition judgment unit 302 and transmission mode switch unit 303, wherein:
Transmission mode switch unit 303 is used for current downlink transfer pattern is switched to the target downlink transmission mode.
The course of work of this device embodiment is: obtain the order indication and obtain the channel quality indication by information acquisition unit 303, indication is searched the corresponding table with spectrum efficiency of channel quality indication and is obtained spectrum efficiency according to channel quality; Then it is pre-conditioned to judge by condition judgment unit 302 whether described rank indication information and spectrum efficiency information satisfy, and if so, then triggers transmission mode switch unit 303 current downlink transfer pattern is switched to the target downlink transmission mode.
This device embodiment obtains first rank indication information and frequency efficiency information, with its switching foundation of switching as the downlink transfer pattern, satisfying when pre-conditioned, realizes that current downlink transfer pattern is to the switching of target downlink transmission mode.Compared with prior art, this device embodiment is when the switching of carrying out between LTE system different transmission mode, not only consider rank indication information, and consideration spectrum efficiency information, because spectrum efficiency information is not directly provided by UE, thereby so that the handoff procedure that carries out according to order indication and spectrum efficiency reliability more is conducive to maximize the downlink tone spectrum efficiency and strengthens and transmits stationarity.In addition, owing to no longer consider velocity information in the handoff procedure, make the scheme of this device embodiment applicable to comprising that indoor this class is to the insensitive occasion of speed.
The spectrum efficiency that information acquisition unit among the said apparatus embodiment obtains can be described as the priori spectrum efficiency, in actual application, in order to improve the accuracy of spectrum efficiency, the application preferably adjusts according to the physical link situation spectrum efficiency, and the spectrum efficiency after the adjustment can be described as the posteriority spectrum efficiency.Based on this, said apparatus embodiment can also comprise adjustment unit 304, be used for adjusting according to default regulation rule according to Block Error Rate and/or HARQ number of retransmissions, then described condition judgment unit 302 is concrete is used for judging whether the spectrum efficiencies after the adjustment satisfy pre-conditioned.
The condition judgment unit of said apparatus embodiment can have different internal structures in different judgment mode situations.Such as, when taking two to go on foot determining method, condition judgment unit 302 can comprise the first judgment sub-unit 3021, the second judgment sub-unit 3022 and the 3rd judgment sub-unit 3023, wherein: the first judgment sub-unit 3021, be used for judging that described order indication equals the first preset value or the second preset value, described the first preset value and the second preset value are the code word number of the MIMO mode of current downlink transfer pattern; When the order indication equals the first preset value, trigger the second judgment sub-unit 3022, when the order indication equals the second preset value, trigger the 3rd judgment sub-unit 3023; The second judgment sub-unit 3022, the code word number that is used for judging the MIMO mode of current downlink transfer pattern are whether the state of the first preset value exceeds the first Preset Time, and be described pre-conditioned for exceeding the first Preset Time; The 3rd judgment sub-unit 3023, whether the spectrum efficiency that is used for judging current downlink mode less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values, described pre-conditioned be that the spectrum efficiency of current downlink transfer pattern is less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values.Under second case, said apparatus embodiment can also comprise the timer of setting the second Preset Time, aforementioned the 3rd judgment sub-unit 3023 then, the code word number that also is used for judging the MIMO mode of current downlink transfer pattern is whether the state of the second preset value surpasses the second Preset Time, and exceed the second Preset Time described pre-conditioned also comprising.Adopt as above two step determining methods to combine switching between LTE system descending transmission mode and the attributive character of the MIMO mode in the pattern, be conducive to further improve the spectrum efficiency of down link, further strengthen transmission stability.
When the transmission mode switch unit of said apparatus embodiment switches between two kinds of patterns, certainly exist switching delay, for the professional Transmission that prevents that switching delay from causing, the preferred said apparatus embodiment of the application also comprises resource allocation unit, be used for described order indication and spectrum efficiency satisfy pre-conditioned current downlink transfer pattern is switched to the target downlink transmission mode during, 1A keeps transfer of data to the user equipment allocation resource by the down link control information form, specifically can be to keep transfer of data in the transmit diversity mode after the user equipment allocation resource.
In addition, said apparatus embodiment also comprises filter unit 305, be used for behind the rank indication information that obtains under the current downlink transfer pattern, rank indication information is carried out filtering, and described condition judgment unit is used for specifically judging whether rank indication information and/or posteriority spectrum efficiency information through filtering satisfy pre-conditioned.
For the convenience of describing, be divided into various unit with function when describing above device and describe respectively.Certainly, when implementing the application, can in same or a plurality of softwares and/or hardware, realize the function of each unit.Such as, all functional units can be formed a single unit system, be arranged at base station side, be used for the control different user devices and between different downlink transfer patterns, switch.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the application and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that the application's technical scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the application or embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses is difference with other embodiment.Especially, for system embodiment, because its basic simlarity is in embodiment of the method, so describe fairly simplely, relevant part gets final product referring to the part explanation of embodiment of the method.System embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation of not paying creative work.
The application can be used in numerous general or special purpose computingasystem environment or the configuration.For example: personal computer, server computer, handheld device or portable set, plate equipment, multicomputer system, the system based on microprocessor, set top box, programmable consumer-elcetronics devices, network PC, minicom, mainframe computer, comprise distributed computing environment (DCE) of above any system or equipment etc.
The application can describe in the general context of the computer executable instructions of being carried out by computer, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract data type, program, object, assembly, data structure etc.Also can in distributed computing environment (DCE), put into practice the application, in these distributed computing environment (DCE), be executed the task by the teleprocessing equipment that is connected by communication network.In distributed computing environment (DCE), program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
The above only is the application's embodiment; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (13)
1. the changing method between the different downlink transfer patterns of a LTE system is characterized in that the method comprises:
Obtain order indication, and obtain the channel quality indication, and indication is searched the corresponding table with spectrum efficiency of channel quality indication and obtained spectrum efficiency according to channel quality;
It is pre-conditioned to judge whether described order indication and spectrum efficiency satisfy, and if so, then current downlink transfer pattern is switched to the target downlink transmission mode.
2. method according to claim 1 is characterized in that, described method also comprises:
Adjust according to default regulation rule according to Block Error Rate and/or HARQ number of retransmissions searching the spectrum efficiency that the corresponding table with spectrum efficiency of channel quality indication obtains, then described judge order indication and spectrum efficiency whether satisfy pre-conditioned be judge that order is indicated and adjustment after spectrum efficiency whether satisfy pre-conditioned.
3. method according to claim 2 is characterized in that, describedly judges whether order indication and spectrum efficiency satisfy pre-conditioned comprising:
Judge that described order indication equals the first preset value or the second preset value, described the first preset value and the second preset value are the code word number of the MIMO mode of current downlink transfer pattern;
When the order indication equaled the first preset value, the code word number of judging the MIMO mode of current downlink transfer pattern is whether the state of the first preset value exceeds the first Preset Time, and was described pre-conditioned for exceeding the first Preset Time;
When the order indication equals the second preset value, whether judge the spectrum efficiency of current downlink mode less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values, described pre-conditioned be that the spectrum efficiency of current downlink transfer pattern is less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values.
4. method according to claim 3 is characterized in that, when the order indication equaled the second preset value, described method also comprised:
The code word number of judging the MIMO mode of current downlink transfer pattern is whether the state of the second preset value surpasses the second Preset Time, and exceed the second Preset Time described pre-conditioned also comprising.
5. any one described method in 4 according to claim 1, it is characterized in that, when the indication of described order and spectrum efficiency satisfy pre-conditioned, with current downlink transfer pattern switch to the target downlink transmission mode during, 1A keeps transfer of data to the user equipment allocation resource by the down link control information form.
6. method according to claim 5, it is characterized in that, describedly keep transfer of data by down link control information form 1A to the user equipment allocation resource and be specially by down link control information form 1A and keep transfer of data to the user equipment allocation resource in the transmit diversity mode.
7. any one described method in 4 according to claim 1 is characterized in that described method also comprises:
Filtering is carried out in indication to order after obtaining order indication, describedly judges whether rank indication information and spectrum efficiency satisfy pre-conditioned being specially and judge whether satisfy pre-conditioned through filtered order indication and spectrum efficiency.
8. the switching device shifter between the different downlink transfer patterns of a LTE system is characterized in that this device comprises: information acquisition unit, condition judgment unit and transmission mode switch unit, wherein:
Described information acquisition unit is used for obtaining the order indication, and obtains the channel quality indication, and indication is searched the corresponding table with spectrum efficiency of channel quality indication and obtained spectrum efficiency according to channel quality;
Described condition judgment unit, it is pre-conditioned to be used for judging whether described order indication and spectrum efficiency satisfy, and if so, then triggers the transmission mode switch unit;
Described transmission mode switch unit is used for current downlink transfer pattern is switched to the target downlink transmission mode.
9. device according to claim 8, it is characterized in that, described device also comprises adjustment unit, be used for searching the spectrum efficiency that the corresponding table with spectrum efficiency of channel quality indication obtains and adjust according to default regulation rule according to Block Error Rate and/or HARQ number of retransmissions, then described condition judgment unit specifically for judge that order is indicated and adjustment after spectrum efficiency whether satisfy pre-conditioned.
10. device according to claim 9 is characterized in that, described condition judgment unit comprises the first judgment sub-unit, the second judgment sub-unit and the 3rd judgment sub-unit, wherein:
Described the first judgment sub-unit is used for judging that described order indication equals the first preset value or the second preset value, and described the first preset value and the second preset value are the code word number of the MIMO mode of current downlink transfer pattern; When the order indication equals the first preset value, trigger the second judgment sub-unit, when the order indication equals the second preset value, trigger the 3rd judgment sub-unit;
Described the second judgment sub-unit, the code word number that is used for judging the MIMO mode of current downlink transfer pattern are whether the state of the first preset value exceeds the first Preset Time, and be described pre-conditioned for exceeding the first Preset Time;
Described the 3rd judgment sub-unit, whether the spectrum efficiency that is used for judging current downlink mode less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values, described pre-conditioned be that the spectrum efficiency of current downlink transfer pattern is less than the spectrum efficiency of target downlink transmission mode or default spectrum efficiency threshold values.
11. device according to claim 10, it is characterized in that, described device also comprises the timer of setting the second Preset Time, described the 3rd judgment sub-unit then, the code word number that also is used for judging the MIMO mode of current downlink transfer pattern is whether the state of the second preset value surpasses the second Preset Time, and exceed the second Preset Time described pre-conditioned also comprising.
12. any one described device in 11 according to claim 8, it is characterized in that, described device also comprises resource allocation unit, be used for described order indication and spectrum efficiency satisfy pre-conditioned current downlink transfer pattern is switched to the target downlink transmission mode during, 1A keeps transfer of data to the user equipment allocation resource by the down link control information form.
13. any one described device in 11 according to claim 8, it is characterized in that, described device also comprises filter unit, be used for after obtaining the order indication to order indication and carry out filtering, described condition judgment unit specifically is used for judging whether satisfy pre-conditioned through filtered order indication and spectrum efficiency.
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