CN102946263A - Different multiple input multiple output (MIMO) mode switching method and device for down-load mode of long term evolution (LTE) system - Google Patents
Different multiple input multiple output (MIMO) mode switching method and device for down-load mode of long term evolution (LTE) system Download PDFInfo
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Abstract
An embodiment of the invention discloses a different multiple input multiple output (MIMO) mode switching method for down-load mode of a long term evolution (LTE) system. The method includes: obtaining rank indication of the current down-load mode and/or channel quality indication, and searching a channel quality indication and spectrum effectiveness relation table according to the channel quality indication to obtain the spectrum effectiveness; and judging whether the rank indication and/or the spectrum effectiveness can meet the preset conditions, and if the preset conditions are met, switching a first MIMO mode to a second MIMO mode. The embodiment of the invention further discloses a different multiple input multiple output (MIMO) mode switching method for down-load mode of the long term evolution (LTE) system. By means of the different multiple input multiple output (MIMO) mode switching method and device for down-load mode of the long term evolution (LTE) system, MIMO modes can be switched according to real channel conditions of a terminal in self-adaption mode, the spectrum effectiveness of a downward chain can be improved, and stability in transmission can be maintained.
Description
Technical field
The application relates to LTE (Long Term Evolution, Long Term Evolution project) systems technology field, particularly different MIMO mode changing methods and the corresponding intrument thereof of LTE system descending transmission mode.
Background technology
Along with the gradually growth of mobile subscriber's quantity, service of mobile communication is upgraded day by day.3GPP (3rdGeneration Partnership Project, third generation partner program) adapts to the reality technology needs, has proposed the LTE system, with its standard as future mobile communications.In the standard agreement of LTE system, stipulate the adoptable multiple downlink transfer pattern of LTE system, included multiple MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) mode in the transmission mode.For the fixation application scene, the base station adopts fixing MIMO mode to send downlink data usually, but, because user terminal (UE, User Equipment) shift in position, channel conditions change, and therefore, need to switch between a kind of multiple MIMO mode of downlink transfer pattern, with the spectrum efficiency of maximization down link, keep the stationarity of transmission.
The mode of switching between the different MIMO modes of a kind of LTE system descending transmission mode of the prior art is: the base station receives CQI (the Channel Quality Indicator that UE reports, the channel quality indication), RI (Rank Indication, the order indication), PMI (Precoding Matrix Indicator, the pre-coding matrix indication), for CQI, RI, PMI threshold value is set respectively and judges, the base station selects MIMO mode that a kind of suitable present mode supports most to the UE transmitting downlink data according to judged result.Although can realizing LTE downlink transfer pattern, this mode between different MIMO modes, switches, but the parameters C QI of its foundation, RI, PMI all are the measured values that reported by UE, and the measurement capability of different UEs there are differences, may measure the different channels quality information by different UEs under the identical channel condition, thereby the interior different MIMO modes of the pattern that has influence on are switched reliability, the stationarity that is unfavorable for maximizing the downlink tone spectrum efficiency and keeps transmission.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of different MIMO mode method for switching between and device thereof of LTE system descending transmission mode, with the reliability of switching between the different MIMO modes of improving downlink mode, improve the downlink tone spectrum efficiency and keep the stationarity of transmission.
The different MIMO mode method for switching between of the LTE system descending transmission mode that the application provides comprise:
Obtain the order indication under the current downlink transfer pattern, and/or, 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;
It is pre-conditioned to judge whether described order indication and/or spectrum efficiency satisfy, and if so, then a MIMO mode is switched to the 2nd MIMO 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 corresponding spectrum efficiency of showing to obtain with spectrum efficiency of channel quality indication, it is pre-conditioned for judging whether the spectrum efficiency after adjusting satisfies pre-conditioned to judge then whether spectrum efficiency satisfies.
Preferably, set order indication threshold value and/or determine the spectrum efficiency of the 2nd MIMO mode, describedly judge whether order indication and/or spectrum efficiency satisfy and pre-conditionedly specifically comprise:
It is pre-conditioned whether the magnitude relationship between the order indication of relatively obtaining and the order indication threshold value satisfies, described pre-conditioned definite according to a MIMO mode; And/or,
The magnitude relationship between the spectrum efficiency of the spectrum efficiency of a MIMO mode and the 2nd MIMO mode relatively, described pre-conditioned be that the spectrum efficiency of a MIMO mode is less than the spectrum efficiency of the 2nd MIMO mode.
Further preferably, describedly pre-conditionedly determine specifically to comprise according to a MIMO mode:
If a MIMO mode is the transmit diversity mode, then described pre-conditioned the indication greater than order for order indicated threshold value;
If a MIMO mode is spatial multiplexing mode, then described pre-conditioned the indication less than order for order indicated threshold value.
Preferably, after a MIMO mode switches to the 2nd MIMO mode, judge that the spectrum efficiency of the 2nd MIMO mode whether less than the frequency efficiency of a MIMO mode, if so, then switches back a MIMO mode with the 2nd MIMO mode.
Further preferably, described method also comprises:
After the 2nd MIMO mode is switched back a MIMO mode, if the first Preset Time arrives, then carry out and judge whether order indication and/or spectrum efficiency satisfy pre-conditioned step.
Preferably, judge order indication and/or spectrum efficiency satisfy pre-conditioned after, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, after at least one HARQ process of processing, carry out the switch step of a MIMO mode to the two MIMO modes.
Further preferably, judge order indication and/or spectrum efficiency satisfy pre-conditioned after, in the second Preset Time, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, when the second Preset Time arrives, carry out the switch step of a MIMO mode to the two MIMO modes.
Preferably, described method also comprises:
After the order indication of obtaining under the current downlink transfer pattern, filtering is carried out in indication to order, judges whether rank indication information satisfies pre-conditioned being specially and judge that the filtered order of process indicates whether to satisfy pre-conditioned.
The application also provides switching device shifter between a kind of different MIMO modes of LTE system descending transmission mode.This device comprises information acquisition unit, condition judgment unit and MIMO mode switch unit, wherein:
Described information acquisition unit is used for obtaining the order indication under the current downlink transfer pattern, and/or, 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;
Described condition judgment unit, it is pre-conditioned to be used for judging whether described order indication and/or spectrum efficiency satisfy, and if so, then triggers MIMO mode switch unit;
Described MIMO mode switch unit is used for a MIMO mode is switched to the 2nd MIMO mode.
Preferably, institute's device also comprises adjustment unit, 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 is judging whether the spectrum efficiency whether spectrum efficiency satisfies after specifically being used for the judgement adjustment when pre-conditioned satisfies pre-conditioned.
Preferably, described device comprises the Threshold unit, and for the spectrum efficiency of setting order indication threshold value and/or definite the 2nd MIMO mode, described condition judgment unit specifically comprises: the order indexical relation compares subelement and/or spectrum efficiency compares subelement, wherein:
Described order indexical relation compares subelement, and whether the magnitude relationship that is used between relatively order indication and the order indication threshold value satisfies pre-conditioned, described pre-conditioned definite according to a MIMO mode;
Described spectrum efficiency is subelement relatively, is used for the magnitude relationship between the spectrum efficiency of the spectrum efficiency of a MIMO mode relatively and the 2nd MIMO mode, described pre-conditioned be that the spectrum efficiency of a MIMO mode is less than the spectrum efficiency of the 2nd MIMO mode.
Further preferably, describedly pre-conditionedly determine to comprise according to a MIMO mode:
If a MIMO mode is the transmit diversity mode, then described pre-conditioned the indication greater than order for order indicated threshold value;
If a MIMO mode is spatial multiplexing mode, then described pre-conditioned the indication less than order for order indicated threshold value.
Preferably, described device also comprises the spectrum efficiency judging unit, be used for after MIMO mode switch unit switches to the 2nd MIMO mode with a MIMO mode, whether the spectrum efficiency of judging the 2nd MIMO mode is less than the frequency efficiency of a MIMO mode, if so, then trigger MIMO mode switch unit the 2nd MIMO mode is switched back a MIMO mode.
Further preferably, described device also comprises first timer, after MIMO mode switch unit switches back a MIMO mode with the 2nd MIMO mode, if the arrival of the first Preset Time of first timer, then trigger condition judging unit.
Preferably, described device also comprises HARQ process processing unit, be used for judge order indication and/or spectrum efficiency satisfy pre-conditioned after, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, after continuing to process at least one HARQ process, trigger MIMO mode switch unit.
Further, described device also comprises second timer, HARQ process processing unit does not receive new HARQ process and processes in the second Preset Time of second timer, process the existing HARQ process under the MIMO mode, when the second Preset Time of second timer arrives, trigger MIMO mode switch unit.
Preferably, described device also comprises filter unit, be used for after the order indication of obtaining under the current downlink transfer pattern, filtering is carried out in order indication, and described condition judgment unit specifically is used for judging when pre-conditioned through filtered order and indicates and/or whether spectrum efficiency satisfies pre-conditioned judging that order indicates whether to satisfy.
The embodiment of the present application is by obtaining rank indication information and/or the frequency efficiency information under the current MIMO mode, with it as the foundation that is switched to target MIMO mode (the 2nd MIMO mode) by current MIMO mode (a MIMO mode).Compared with prior art, when only with rank indication information as switch according to the time owing to reduced the report parameter relevant with UE, can reduce switching between different MIMO modes to the dependence of UE, thereby improve the reliability that the MIMO mode is switched.When with rank indication information and spectrum efficiency as switch according to the time because spectrum efficiency provides by base station side, also reduced different MIMO modes and switched dependence to UE, thereby improved the reliability that MIMO switches.
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 different MIMO mode of LTE system descending transmission mode method for switching between embodiment flow chart;
Fig. 2 is the switching state schematic diagram between transmit diversity mode and the Open-Loop Spatial Multiplexing mode;
Fig. 3 is the switching state schematic diagram between transmit diversity mode and the Closed-Loop Spatial Multiplexing mode;
Fig. 4 is the structured flowchart of switching device shifter embodiment between the different MIMO modes of LTE system descending transmission mode.
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.
As previously mentioned, as the foundation of switching between the different MIMO modes that realize LTE system descending transmission mode, this mode is unfavorable for improving the reliability of switching between different MIMO modes to prior art with parameters such as CQI, RI and PMI.For addressing this problem, the application provides a kind of embodiment of different MIMO mode method for switching between of LTE system descending transmission mode.Referring to Fig. 1, the figure shows the flow process of present embodiment.This embodiment comprises:
Step S101: obtain the order indication under the current downlink transfer pattern, and/or, 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 " (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 CodingScheme, 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/or spectrum efficiency satisfy, and if so, then a MIMO mode is switched to the 2nd MIMO mode;
After obtaining order indication and/or spectrum efficiency by abovementioned steps, it is pre-conditioned to judge whether order indication and/or spectrum efficiency satisfy, and in situation about satisfying, carries out the switching of a MIMO mode to the two MIMO modes, otherwise, do not carry out handover operation.The judgment mode here can show as multiple concrete mode:
A kind of mode can show as the numerical value that will obtain and the threshold values of presetting and compare.Take rank indication information as example, after setting order indication threshold values, judge whether the rank indication information that obtains satisfies pre-conditioned can being specially: it is pre-conditioned whether the magnitude relationship between the order indication of relatively obtaining and the order indication threshold value satisfies, described pre-conditioned definite according to a MIMO mode.Such as, when a MIMO mode (current MIMO mode) is the transmit diversity mode, will judge whether now needs this mode is switched to other MIMO modes, then whether above-mentioned judgment mode indicates threshold values greater than order for the rank indication information of judging the transmit diversity mode, pre-conditioned be preset as the order indication of obtaining greater than order indication threshold value situation under, if satisfy pre-conditioned, the order indication that is the transmit diversity mode is indicated threshold values greater than order, then the transmit diversity mode is switched to other MIMO modes (the 2nd MIMO mode).Similarly, when a MIMO mode (current MIMO mode) is spatial multiplexing mode, need to judge whether now needs this mode is switched to other MIMO modes, then whether above-mentioned judgment mode indicates threshold values less than order for the rank indication information of judging spatial multiplexing mode, pre-conditioned be preset as the order indication of obtaining less than order indication threshold value situation under, if satisfy pre-conditioned, the order indication that is the transmit diversity mode is indicated threshold values less than order, then spatial multiplexing mode is switched to other MIMO modes (the 2nd MIMO mode).
Another kind of mode can show as the numerical value that will obtain and obtain another numerical value by other channels and compare.Take the posteriority spectrum efficiency as example, after the posteriority spectrum efficiency that gets access to the 2nd MIMO mode, judge whether the posteriority spectrum efficiency obtain satisfies pre-conditioned can being specially: the magnitude relationship between the posteriority spectrum efficiency of the posteriority spectrum efficiency of a MIMO mode and the 2nd MIMO mode relatively, described pre-conditioned be that the posteriority spectrum efficiency of a MIMO mode is less than the posteriority spectrum efficiency threshold values of the 2nd MIMO mode.Such as, when a MIMO mode is the transmit diversity mode, will judge whether now needs this mode is switched spatial multiplexing mode, then above-mentioned judgment mode is the magnitude relationship between the posteriority spectrum efficiency of the posteriority spectrum efficiency of judging the transmit diversity mode and spatial multiplexing mode, because generally the posteriority spectrum efficiency of spatial multiplexing mode is high than the posteriority spectrum efficiency of transmit diversity mode, the pre-conditioned posteriority spectrum efficiency of transmit diversity mode that can be preset as is less than the posteriority spectrum efficiency of spatial multiplexing mode, if pre-conditioned satisfied, be the posteriority spectrum efficiency of transmit diversity mode less than the posteriority spectrum efficiency of spatial multiplexing mode, then the transmit diversity mode is switched to spatial multiplexing mode.
Except above-mentioned dual mode (in the mode of the numerical value that obtains and the comparison of a fixed reference value and in the numerical value that the obtains mode with a dynamic benchmark value comparison), can also adopt other modes, be used for realization whether need to be by the switching of a MIMO mode to the two MIMO modes in conjunction with rear such as above-mentioned dual mode is carried out.
Present embodiment is by obtaining order indication and/or the frequency efficiency information under the current MIMO mode, with it as the foundation that is switched to target MIMO mode by current MIMO mode, and then the switching between the different MIMO modes of realization LTE system descending transmission mode.Compared with prior art, because present embodiment determines the foundation of whether carrying out switching between different MIMO modes and comprises spectrum efficiency, and this spectrum efficiency and UE type do not have and must contact directly, different network environments is less on the impact of this physical quantity, make according to spectrum efficiency and determine that the objectivity of whether switching the MIMO mode strengthens, improved the reliability of switching between the different MIMO modes of LTE system descending transmission mode, the stationarity that is conducive to maximize the downlink tone spectrum efficiency and keeps transmission.In addition, because present embodiment determines that the foundation of whether carrying out switching between different MIMO modes is two or one, three parameters than prior art, number of parameters reduces, thereby the number of parameters that one side UE reports reduces thereupon, UE is few to the information interaction quantitative change of base station side, has saved resource; The data volume of base station side tails off on the other hand, has alleviated the processing load of base station side.
Previous embodiment may need to carry out some and be out of shape to adapt to the specific purpose needs in actual application.Such as, a kind of Deformation Demands is: in that a MIMO mode is switched in the 2nd MIMO mode process, may also have a plurality of HARQ processes under the MIMO mode, if these processes are not disposed, may have influence on the normal operation of the second MIMO mode, cause loss of data.For addressing this problem, the application preferably judge the order indication of obtaining and/or posteriority spectrum efficiency satisfy pre-conditioned after, the one MIMO mode is switched to before the 2nd MIMO mode, continue the existing HARQ process under the MIMO mode of processing and do not receive new HARQ process.
Yet, although process the normal operation that the HARQ process is conducive to whole LTE system descending pattern by continuation as above, but still there are in some cases some problems, such as, the time of continuing processing is oversize, causes the MIMO mode of downlink mode in time not switched, perhaps, because the processing operating time is too short, also may cause loss of data.Switch to the transmit diversity mode as example take spatial multiplexing mode, because spatial multiplexing mode adopts the dicode word, and the transmit diversity mode adopts single codeword, if being switched to the transmit diversity mode, spatial multiplexing mode do not do any processing, in the situation that dicode word HARQ process need to retransmit, because switching to single codeword, can't carry out the dicode word and retransmit, thereby cause losing of data.For this reason, the application preferably has in the situation of clear operation, also increases a timer, is used for the time that operation is processed in control, when the Preset Time of timer arrives a MIMO mode is switched to the 2nd MIMO mode.By this mechanism of timer is set, in fact innovated a kind of new state, namely except the state of the state of a MIMO mode and the 2nd MIMO mode, also comprise the transition state by a MIMO mode to the two MIMO modes, the standby condition that perhaps is called the 2nd MIMO mode, groundwork in this standby condition is to know the HARQ process, with convenient correctly realize switching or be conducive to switch after the normal operation of MIMO mode.
Also such as, another kind of Deformation Demands is: previous embodiment is with the switching between the different MIMO modes of one direction angle observation LTE system descending transmission mode, but in actual application, possible some purpose MIMO mode only is a kind of mode of transition nature, after namely switching to the 2nd MIMO mode by a MIMO mode, the 2nd MIMO mode duration is shorter, is satisfying under some predetermined condition, switches back again a MIMO mode or other modes.Under the situation that a MIMO mode and the 2nd MIMO mode are switched back and forth, need to pay close attention to the two-way switching problem of MIMO mode.The application preferably processes this problem in the following manner: after a MIMO mode switches to the 2nd MIMO mode, whether the posteriority spectrum efficiency of judging the 2nd MIMO mode is less than the posteriority frequency efficiency of a MIMO mode, if so, then the 2nd MIMO mode is switched back a MIMO mode.This mode judges whether to need switch back original MIMO mode as foundation with the posteriority spectrum efficiency after switching to purpose MIMO mode, and its purpose is to maximize the downlink tone spectrum efficiency.Certainly, in the actual application, also can adopt the combination of rank indication information or rank indication information and posteriority spectrum efficiency as according to returning switching, can improve to a certain extent equally the overall spectral efficiency of down link.However, under the situation of switching back former MIMO mode, can not make that this to return switching too frequent, because can have influence on spectrum efficiency and business datum throughput equally like this.The better mode of avoiding too frequently switching (switching of the 2nd MIMO mode to a MIMO mode) is cautiously to switch for the first time (switchings of a MIMO mode to the two MIMO modes), for this reason, the application is preferably to this situation of returning switching, after switching back a MIMO mode, certain " punishment " time is set, in this " punishment " in the time, even if satisfy the switching condition to the 2nd MIMO mode, do not switch yet, and after need to waiting until this " punishment " time arrival, just carry out handover operation.
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 transmit diversity mode to the switching state conversion process between the Open-Loop Spatial Multiplexing diversity mode.This handoff procedure comprises one of four states: transmit diversity state, Open-Loop Spatial Multiplexing standby condition, Open-Loop Spatial Multiplexing state, transmit diversity standby condition.This one of four states has clearly illustrated with the handoff procedure between the different MIMO modes of bidirectional visual consideration LTE system descending transmission mode:
For the transmit diversity state to the Open-Loop Spatial Multiplexing standby condition: when under the transmit diversity mode, if RI is more than or equal to default rank indication information 1.5, and the Preset Time of punishment timer arrives, then the transmit diversity state is switched to the Open-Loop Spatial Multiplexing standby condition, here be not directly switch to the purpose of Open-Loop Spatial Multiplexing state, be on the one hand to give the time continuation and process the HARQ process that has been untreated, be on the other hand to treat cautiously the switching between different MIMO modes, switch too frequently preventing.
For the Open-Loop Spatial Multiplexing standby condition to the Open-Loop Spatial Multiplexing state: after entering the Open-Loop Spatial Multiplexing standby condition, if the RI value greater than 1.4 and keep certain hour, is then changed to the Open-Loop Spatial Multiplexing state.But when the RI value is unstable when occurring RI less than or equal to preset value 1.4, transmit diversity state after then switching.
For the Open-Loop Spatial Multiplexing state to the transmit diversity standby condition: under the Open-Loop Spatial Multiplexing state, if RI is greater than 1.4 and spectrum efficiency when being higher than transmit diversity, continue to keep this state, but when RI less than or equal to 1.4 or spectrum efficiency when being lower than transmit diversity, then switch to the transmit diversity standby condition.
Arrive the transmit diversity state for the transmit diversity standby condition: under the transmit diversity standby condition, if RI less than or equal to 1.4 or spectrum efficiency be lower than transmit diversity, then switch to the transmit diversity state, but when RI more than or equal to 1.5 and spectrum efficiency when being higher than transmit diversity, return again the Open-Loop Spatial Multiplexing state.
" transmit diversity state " and " Open-Loop Spatial Multiplexing state " is major state in the above-mentioned one of four states, " transmit diversity standby condition " and " Open-Loop Spatial Multiplexing standby condition " is secondary status, it serves major state, is used for realizing taking over seamlessly between two major states.Also need to prove: although the switching condition that the transmit diversity state switches to the multiplexing standby condition of open loop and the multiplexing standby condition of open loop switch postback the switching condition of penetrating diversity status can be identical, but in above-mentioned example, there are differences, be that the former is that RI is more than or equal to 1.5, the latter is less than or equal to 1.4, exist certain interval poor between the two, this is a kind of " magnetic hysteresis " mechanism that the application arranges, and can avoid occurring owing to measure the unstable fluctuation that brings or excessively frequently switch the problems such as the wasting of resources that brings and downlink transfer be unstable by this mechanism.In addition, can also be with reference to transmit diversity shown in Figure 3 and the handoff procedure between the Closed-Loop Spatial Multiplexing standby condition about the switching between different MIMO modes.
Above content is the description to the application's embodiment of the method, and correspondingly, the application also provides device embodiment.Referring to Fig. 4, the figure shows the structure of switching device shifter embodiment between the different MIMO modes of LTE system descending transmission mode.This device embodiment comprises: information acquisition unit 401, condition judgment unit 402 and MIMO mode switch unit 403, wherein:
MIMO mode switch unit 403 is used for a MIMO mode is switched to the 2nd MIMO mode.
The course of work of this device embodiment is: information acquisition unit 401 is after the order indication and/or spectrum efficiency of obtaining under the MIMO mode, if it is pre-conditioned that the order indication that 402 judgements of condition judgment unit are obtained and/or spectrum efficiency satisfy, then trigger MIMO mode switch unit the one MIMO mode is switched to the 2nd MIMO mode.
This device embodiment is by obtaining order indication and/or the frequency efficiency information under the current MIMO mode, with it as the foundation that is switched to target MIMO mode by current MIMO mode, and then the switching between the different MIMO modes of realization LTE system descending transmission mode.Compared with prior art, because this device embodiment determines the foundation of whether carrying out switching between different MIMO modes and comprises the posteriority spectrum efficiency, and this spectrum efficiency and UE type do not have positive connection, different network environments is less on the impact of this physical quantity, make according to the posteriority spectrum efficiency and determine that the objectivity of whether switching the MIMO mode strengthens, improved the reliability of switching between the different MIMO modes of LTE system descending transmission mode, the stationarity that is conducive to maximize the downlink tone spectrum efficiency and keeps transmission.In addition, because this device embodiment determines that the foundation of whether carrying out switching between different MIMO modes is two or one, than three parameters of prior art, number of parameters reduces, thereby the parameter that one side UE reports reduces, and UE is few to the information interaction quantitative change of base station side, has saved resource; The data volume of base station side tails off on the other hand, has alleviated the processing load of base station side.
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 preparatory 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 404, 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 is used for specifically judging whether the spectrum efficiency after the adjustment satisfies pre-conditioned.
The condition judgment unit of said apparatus embodiment can have different internal structures in different judgment mode situations.Such as, comprise at said apparatus embodiment under the Threshold cell cases of the spectrum efficiency of indicating threshold value or definite the 2nd MIMO mode for the setting order, condition judgment unit 402 specifically can comprise: the order indexical relation compares subelement 4021 and/or spectrum efficiency compares subelement 4022, wherein: the order indexical relation is subelement 4021 relatively, whether the magnitude relationship that is used between relatively order indication and the order indication threshold value satisfies pre-conditioned, described pre-conditioned definite according to a MIMO mode, if the MIMO mode that is specifically as follows is the transmit diversity mode, then described pre-conditioned the indication greater than order for order indicated threshold value; If a MIMO mode is spatial multiplexing mode, then described pre-conditioned the indication less than order for the order of obtaining indicated threshold value; Spectrum efficiency is subelement 4022 relatively, be used for the magnitude relationship between the spectrum efficiency threshold value of the spectrum efficiency of a MIMO mode relatively and the 2nd MIMO mode, described pre-conditioned be that the spectrum efficiency of a MIMO mode is less than the spectrum efficiency threshold values of the 2nd MIMO mode.
Said apparatus embodiment is for some special requirement, can also have special structure, in situation about switching in two-way angle observation MIMO mode, described device can also comprise the spectrum efficiency judging unit, be used for after MIMO mode switch unit switches to the 2nd MIMO mode with a MIMO mode, whether the spectrum efficiency of judging the 2nd MIMO mode is less than the frequency efficiency of a MIMO mode, if so, then trigger MIMO mode switch unit the 2nd MIMO mode is switched back a MIMO mode.Further, under this mode, in order to prevent between different MIMO modes, switching continually, described device can also comprise first timer, after MIMO mode switch unit switches back a MIMO mode with the 2nd MIMO mode, if the first Preset Time of first timer arrives, then the trigger condition judging unit.
Except above-mentioned improvement to device embodiment, said apparatus embodiment can also comprise HARQ process processing unit 405, be used for judge order indication and/or spectrum efficiency satisfy pre-conditioned after, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, after continuing to process at least one HARQ process, trigger MIMO mode switch unit the one MIMO mode is switched to the 2nd MIMO mode.By continue processing the normal operation after the HARQ process is conducive to switch to purpose MIMO mode.In this case, said apparatus embodiment can also comprise second timer, HARQ process clearing cell is processed the existing HARQ process under the MIMO mode and is not received new HARQ process in the second Preset Time of second timer, after the second Preset Time of second timer arrives, trigger MIMO mode switch unit the one MIMO mode is switched to the 2nd MIMO mode.
In addition, said apparatus embodiment also comprises filter unit 406, 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 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 handover operation of control different user devices between different downlink transfer patterns.
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 (18)
1. the different MIMO mode method for switching between of a LTE system descending transmission mode is characterized in that the method comprises:
Obtain the order indication under the current downlink transfer pattern, and/or, 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;
It is pre-conditioned to judge whether described order indication and/or spectrum efficiency satisfy, and if so, then a MIMO mode is switched to the 2nd MIMO 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 corresponding spectrum efficiency of showing to obtain with spectrum efficiency of channel quality indication, it is pre-conditioned for judging whether the spectrum efficiency after adjusting satisfies pre-conditioned to judge then whether spectrum efficiency satisfies.
3. method according to claim 1 and 2 is characterized in that, sets order indication threshold value and/or determines the spectrum efficiency of the 2nd MIMO mode, describedly judges whether order indication and/or spectrum efficiency satisfy and pre-conditionedly specifically comprises:
It is pre-conditioned whether the magnitude relationship between the order indication of relatively obtaining and the order indication threshold value satisfies, described pre-conditioned definite according to a MIMO mode; And/or,
The magnitude relationship between the spectrum efficiency of the spectrum efficiency of a MIMO mode and the 2nd MIMO mode relatively, described pre-conditioned be that the spectrum efficiency of a MIMO mode is less than the spectrum efficiency of the 2nd MIMO mode.
4. method according to claim 3 is characterized in that, describedly pre-conditionedly determines specifically to comprise according to a MIMO mode:
If a MIMO mode is the transmit diversity mode, then described pre-conditioned the indication greater than order for order indicated threshold value;
If a MIMO mode is spatial multiplexing mode, then described pre-conditioned the indication less than order for order indicated threshold value.
5. method according to claim 1 and 2, it is characterized in that after a MIMO mode switched to the 2nd MIMO mode, the spectrum efficiency of judging the 2nd MIMO mode was whether less than the frequency efficiency of a MIMO mode, if so, then the 2nd MIMO mode is switched back a MIMO mode.
6. method according to claim 5 is characterized in that, described method also comprises:
After the 2nd MIMO mode is switched back a MIMO mode, if the first Preset Time arrives, then carry out and judge whether order indication and/or spectrum efficiency satisfy pre-conditioned step.
7. method according to claim 1 and 2, it is characterized in that, judge order indication and/or spectrum efficiency satisfy pre-conditioned after, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, after at least one HARQ process of processing, carry out the switch step of a MIMO mode to the two MIMO modes.
8. method according to claim 7, it is characterized in that, judge order indication and/or spectrum efficiency satisfy pre-conditioned after, in the second Preset Time, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, when the second Preset Time arrives, carry out the switch step of a MIMO mode to the two MIMO modes.
9. method according to claim 1 is characterized in that, described method also comprises:
After the order indication of obtaining under the current downlink transfer pattern, filtering is carried out in indication to order, judges that order indicates whether to satisfy pre-conditioned being specially and judges that the filtered order of process indicates whether to satisfy pre-conditioned.
10. switching device shifter between the different MIMO modes of a LTE system descending transmission mode is characterized in that, this device comprises information acquisition unit, condition judgment unit and MIMO mode switch unit, wherein:
Described information acquisition unit is used for obtaining the order indication under the current downlink transfer pattern, and/or, 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;
Described condition judgment unit, it is pre-conditioned to be used for judging whether described order indication and/or spectrum efficiency satisfy, and if so, then triggers MIMO mode switch unit;
Described MIMO mode switch unit is used for a MIMO mode is switched to the 2nd MIMO mode.
11. device according to claim 10, it is characterized in that, institute's device also comprises adjustment unit, be used for adjusting according to default regulation rule according to Block Error Rate and/or HARQ number of retransmissions, then whether described condition judgment unit satisfies in determination frequency efficient and is used for specifically judging whether the spectrum efficiency after the adjustment satisfies pre-conditioned when pre-conditioned.
12. according to claim 10 or 11 described devices, it is characterized in that, described device comprises the Threshold unit, the spectrum efficiency that is used for setting order indication threshold value and/or determines the 2nd MIMO mode, described condition judgment unit specifically comprises: the order indexical relation compares subelement and/or spectrum efficiency compares subelement, wherein:
Described order indexical relation compares subelement, and whether the magnitude relationship that is used between relatively order indication and the order indication threshold value satisfies pre-conditioned, described pre-conditioned definite according to a MIMO mode;
Described spectrum efficiency is subelement relatively, is used for the magnitude relationship between the spectrum efficiency of the spectrum efficiency of a MIMO mode relatively and the 2nd MIMO mode, described pre-conditioned be that the spectrum efficiency of a MIMO mode is less than the spectrum efficiency of the 2nd MIMO mode.
13. device according to claim 12 is characterized in that, describedly pre-conditionedly determines to comprise according to a MIMO mode:
If a MIMO mode is the transmit diversity mode, then described pre-conditioned the indication greater than order for order indicated threshold value;
If a MIMO mode is spatial multiplexing mode, then described pre-conditioned the indication less than order for order indicated threshold value.
14. according to claim 10 or 11 described devices, it is characterized in that, described device also comprises the spectrum efficiency judging unit, be used for after MIMO mode switch unit switches to the 2nd MIMO mode with a MIMO mode, whether the spectrum efficiency of judging the 2nd MIMO mode is less than the frequency efficiency of a MIMO mode, if so, then trigger MIMO mode switch unit the 2nd MIMO mode is switched back a MIMO mode.
15. device according to claim 14, it is characterized in that described device also comprises first timer, after MIMO mode switch unit switches back a MIMO mode with the 2nd MIMO mode, if the first Preset Time of first timer arrives, then the trigger condition judging unit.
16. according to claim 10 or 11 described devices, it is characterized in that, described device also comprises HARQ process processing unit, be used for judge order indication and/or spectrum efficiency satisfy pre-conditioned after, no longer receive new HARQ process, continue the existing HARQ process under the MIMO mode of processing, after continuing to process at least one HARQ process, trigger MIMO mode switch unit.
17. device according to claim 16, it is characterized in that, described device also comprises second timer, HARQ process processing unit does not receive new HARQ process and processes in the second Preset Time of second timer, process the existing HARQ process under the MIMO mode, when the second Preset Time of second timer arrives, trigger MIMO mode switch unit.
18. device according to claim 10, it is characterized in that, described device also comprises filter unit, be used for after the order indication of obtaining under the current downlink transfer pattern, filtering is carried out in order indication, and described condition judgment unit specifically is used for judging when pre-conditioned and indicates whether to satisfy pre-conditioned through filtered order judging that order indicates whether to satisfy.
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