CN103442398A - Method and device for switching transmission modes based on LTE system - Google Patents
Method and device for switching transmission modes based on LTE system Download PDFInfo
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Abstract
The invention discloses a method and device for switching transmission modes based on an LTE system. The method and device are used for solving the problems in the prior art that radio resources are wasted and total handling capacity is reduced due to the fact that the TM3 and the TM7 are frequently switched. The method comprises the steps that when data are transmitted by the adoption of the TM7 on the network side, whether a user terminal supports SRS sending in turns is judged; if the user terminal supports the SRS sending in turns, the TM7 is switched to the TM3 when the network side determines a spectrum effectiveness value corresponding to the TM7 is larger than or equal to a set first threshold value and a value of a current channel correlation parameter is smaller than a second threshold; otherwise, when the network side determines the spectrum effectiveness value corresponding to the TM7 is larger than and equal to the set first threshold and the forbidden switch frequency reaches a set threshold, the TM7 is switched to the TM3. Therefore, frequent switching between the TM7 and the TM3 is achieved by adding judging conditions and prolonging switching periods.
Description
Technical field
Design of communications of the present invention field, relate in particular to a kind of in the LTE system method and the device to the switching of different transmission mode.
Background technology
In recent years, along with the development of mechanics of communication, the reliability of wireless transmission more and more was subject to communications field personnel's attention, should guarantee the stability of transmission, also will guarantee the efficiency of transmission of channel.In Long Term Evolution (Long Term Evolution, LTE) system, in order to improve channel capacity, increase the reliability of system, usually adopt multiple-input, multiple-output (Multiple Input Multiple Output, MIMO) technology.The use of MIMO technology has been played outstanding role in the problem that solves the intensive volume of business bottleneck of wireless network.The MIMO technology refers to utilizes many transmit antennas and Duo Gen reception antenna to carry out wireless transmission, the signal of starting end antenna is merged, improved each user's communication quality and quantity, MIMO can greatly improve performance for wireless communications, need to not take frequency spectrum as cost.
Wherein, a kind of MIMO mode often is only applicable to a kind of fixing channel scene, for example, and single-stream transmission, stream transmission.Single-stream transmission can only send a data flow, can guarantee the signal to noise ratio of receiving terminal simultaneously, a little less than being applicable to channel relevancy, and the channel scene that signal to noise ratio is low; Stream transmission sends two incoherent data flow simultaneously, thereby improves power system capacity, a little less than being applicable to channel relevancy, and the channel scene that signal to noise ratio is high.
In actual wireless environment, due to the mobility of user terminal, the difference in geographical position, caused the situation of described user terminal place channel also constantly to change, if adopt single MIMO mode, system is difficult in efficient operating state.In order to overcome this defect, so defined multiple transmission mode and MIMO mode in the LTE system, transmission mode can self adaptation be switched to different channel statuss according to the feedback information of user terminal (User Equipment, UE) in base station.As shown in table 1 is transmission mode in LTE R8 system:
Table 1
With adopting fixed mode multi-antenna technology, compare, self adaptation switching transmission mode technology has very high flexibility, thereby has improved systematic function.Determine the selection of MIMO mode according to factors such as channel conditions, type of service, numbers of users: when channel conditions is good, can select by stream transmission to obtain higher efficiency of transmission; When channel conditions is severe, can select single-stream transmission to obtain laser propagation effect preferably.
As shown in Table 1, support 7 kinds of transmission modes in the LTE system.Two antenna port transmission are generally all supported in outdoor base station, and therefore, the application channel scene of the transmission mode 1 of single port and the transmission mode 5 of poor-performing is less; There is the MIMO mode of transmission diversity in 2 of transmission modes, and have comprised this MIMO mode in transmission mode 3; The all MIMO modes that comprised transmission mode 6 in transmission mode 4, under the mood of two antenna port transmission, the performance of transmission mode 4 is not as good as transmission mode 3.Therefore in the situation that two antenna port transmission are supported in base station, what LTE R8 system was mainly applied is transmission mode 3 and transmission mode 7.In order to adapt to the variation of mobile terminal channel circumstance of living in, need to carry out the switching between transmission mode 3 and transmission mode 7 according to channel situation.
At present, in order to solve transmission mode 3(TM3 in the LTE system) and transmission mode 7(TM7) between the problem of switching, mentioned in existing technical scheme according to the channel conditions of judgement channel scene and switched transmission mode, detailed process is as follows:
At first judge current transmission mode, the deterministic model switching cycle, one-period is divided into mode decision time period and pattern point switching time.Then in the time period, calculate the spectrum efficiency summation under present mode at mode decision.Spectrum efficiency summation and the predefined threshold value of system under last present mode compare, if, while reaching between preset mode corresponding to the transmission mode of current employing the handoff threshold value, carry out switching between pattern.
Due to the LTE system under the pattern of TM7, grading index (Rank Indicator can not measured and report to user terminal, RI) value, so base station can't be determined current channel relevancy and whether be applicable to carrying out stream transmission by the information reported, if the channel relevancy of currently used channel, than strong and path loss is little, there will be the phenomenon of the frequent switching of TM7 and TM3.The quantity of the data flow that described RI value is the parallel transmission that can support of indicating channel.And, by above-mentioned transmission mode handoff procedure, TM3 switches to TM7, if under TM7, the better performances of single current, switch to again TM3; When TM3, because double-current poor-performing can switch to TM7 again again, so repeatedly, also there will be the phenomenon of the frequent switching of TM7 and TM3.
The phenomenon of the frequent switching of this TM7 and TM3 can produce some consequences: often carry out a switching between pattern in the LTE system, capital sends a RRC and connects reconfiguration message to UE, notice UE changes transmission mode, after UE successfully resolves above-mentioned RRC connection reconfiguration message, can start new parameter configuration and send one and reshuffle message to base station, therefore, between pattern, switching can cause signaling consumption frequently, the interface-free resources waste; When TM7, the throughput of system is higher, and when switching to TM3, throughput reduces, if switching repeatedly between TM3 and TM7, throughput presents zigzag, thus frequently between pattern switching can cause total throughout to reduce.
Summary of the invention
The embodiment of the present invention provides a kind of changing method and device based on the LTE system transmission mode, and in order to solve, the interface-free resources because between channel scene difference generation TM3 and TM7, frequent switching causes existed in prior art is wasted, the problem of total throughout reduction.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
First aspect, a kind of changing method based on the LTE system transmission mode comprises:
When network side adopts transmission mode TM7 to carry out transfer of data, judge whether user terminal supports that SRS sends in turn;
If network side is determining that spectral efficiency values corresponding to described TM7 is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter switches to TM3 by TM7 during lower than the second threshold value of setting;
Otherwise network side is more than or equal to the first threshold value of setting in definite spectral efficiency values corresponding to described TM7, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
Like this, the LTE system is determined while adopting transmission mode TM7, when if user terminal is supported SRS wheel flow transmission, judge whether transmission mode is switched by spectral efficiency values and a stable factor of transmission mode---the channel relevancy parameter determined, and avoided the frequent switching of transmission mode at that time; If user terminal is not supported SRS wheel flow transmission, judge whether transmission mode is switched by the spectral efficiency values of transmission mode at that time and forbid that the number of times of switching determines, extends the cycle that TM7 switches to TM3, has also avoided the frequent switching of transmission mode.
In conjunction with first aspect, in the first, in possible implementation, network side adopts following formula to calculate current channel relevancy parameter:
N=λ1/λ2
Wherein, λ 1 and λ 2 are for to carry out to channel correlation matrix two characteristic values that obtain after singular value decomposition SVD, and λ 1 >=λ 2.
By calculating the channel relevancy parameter, can determine, when corresponding spectral efficiency values reaches the first threshold value at TM7, whether switch to TM3.
In conjunction with first aspect, at the second, in possible implementation, network side determines that the number of times of forbidding switching reaches setting threshold, comprising:
Network side arranges one and forbids the toggle count device, whether the every judgement of the network side spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, to described, forbid that the value of toggle count device once upgrades, when the value of forbidding the toggle count device until described reaches designated value, determine that the number of times of forbidding switching reaches setting threshold.
Forbid the toggle count device by setting, the cycle of TM7 to the TM3 switching can be set according to the number of times of frequent switching before system, thereby extend the cycle of TM7 to the TM3 switching, avoided the frequent switching of transmission mode.
The possible implementation in conjunction with the second of first aspect, further comprises in possible implementation at the third:
Network side is safeguarded a pattern translation register, the every judgement of the network side spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, the number of the switching designator described pattern translation register recorded is upgraded, and a spectral efficiency values corresponding to TM7 of the every judgement of network side is less than the first threshold value of setting, the number of the non-switching designator described pattern translation register recorded is upgraded, wherein, the every record of network side is up-to-date designator once, the longest designator of retention time in the pattern translation register is deleted.
By the pattern translation register is set, can record the judged result after each execution transmission mode switching judging, the threshold value that the number of the switching designator of pattern translation register has determined to forbid the toggle count device.
The third possible implementation in conjunction with first aspect, in the 4th kind of possible implementation, after determining that the number of times of forbidding switching reaches setting threshold, network side forbids that to described the designated value of toggle count device is reset according to the current number of described switching designator.
By this processing method, can be when forbidding that the toggle count device reaches designated value and can't continue to count, the designated value of forbidding the toggle count device is reset, make to forbid the normal operation of toggle count device, can also, according to the situation of the frequent switching of current LTE system, select suitable designated value to avoid the frequent switching of transmission mode.
In conjunction with above-mentioned any one implementation of first aspect, network side further comprises after switching to TM3 by TM7:
If user terminal supports that SRS sends in turn, network side, when definite spectral efficiency values corresponding to described TM3 is less than the 3rd threshold value of setting, switches to TM7 by TM3;
If user terminal does not support that SRS sends in turn, network side, when definite spectral efficiency values corresponding to described TM3 is less than the 4th threshold value of setting, switches to TM7 by TM3.
By this processing method, when the LTE system switches to the TM3 transmission, still can avoid the frequent switching of transmission mode.
Second aspect, a kind of switching device shifter based on the LTE system transmission mode comprises:
Judge module, while for network side, adopting transmission mode TM7 to carry out transfer of data, judge whether user terminal supports detection to send in turn with reference signal SRS;
The first processing module, after at definite user terminal, supporting that SRS sends in turn, determining that spectral efficiency values corresponding to described TM7 is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter switches to TM3 by TM7 during lower than the second threshold value of setting;
The second processing module, after at definite user terminal, not supporting that SRS sends in turn, be more than or equal to the first threshold value of setting in definite spectral efficiency values corresponding to described TM7, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
By this processing method, when network side adopts the TM7 transmission, the first processing module has been avoided the frequent switching between pattern when UE supports SRS wheel flow transmission; The second processing module has been avoided the frequent switching between pattern when UE does not support SRS wheel flow transmission.
In conjunction with second aspect, in the first, in possible implementation, described the first processing module adopts following formula to calculate current channel relevancy parameter:
N=λ1/λ2
Wherein, λ 1 and λ 2 are for to carry out to channel correlation matrix two characteristic values that obtain after singular value decomposition SVD, and λ 1 >=λ 2.
Like this, the first processing module just can obtain the correlation of current channel, thereby can judge whether switch to TM3 when the spectral efficiency values corresponding at TM7 reaches the first threshold value.
In conjunction with second aspect, at the second, in possible implementation, described the second processing module determines that the number of times of forbidding switching reaches setting threshold, comprising:
Described the second processing module arranges one and forbids the toggle count device, whether every judgement spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, to described, forbid that the value of toggle count device once upgrades, when the value of forbidding the toggle count device until described reaches designated value, determine that the number of times of forbidding switching reaches setting threshold.
Like this, the second processing module just can extend the cycle of TM7 to the TM3 switching by forbidding the toggle count device, has avoided the frequent switching of transmission mode.
The possible implementation in conjunction with the second of second aspect, further comprises in possible implementation at the third:
Described the second processing module is safeguarded a pattern translation register, every judgement spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, the number of the switching designator described pattern translation register recorded is upgraded, and a spectral efficiency values corresponding to TM7 of every judgement is less than the first threshold value of setting, the number of the non-switching designator described pattern translation register recorded is upgraded, wherein, every record is up-to-date designator once, the longest designator of retention time in the pattern translation register is deleted.
Like this, the second processing module just can record LTE system in a period of time and judge whether to need the result of switching at every turn.
The third possible implementation in conjunction with second aspect, in the 4th kind of possible implementation, after determining that the number of times of forbidding switching reaches setting threshold, described the second processing module forbids that to described the designated value of toggle count device is reset according to the current number of described switching designator.
Like this, the second processing module just can be determined the cycle of switching next time according to the situation of the frequent switching of system transmission mode before, thereby avoids the frequent switching of transmission mode.
In conjunction with above-mentioned any one implementation of second aspect, after described the first processing module or described the second processing module switch to TM3 by TM7, further comprise:
If user terminal supports that SRS sends in turn, described the first processing module or described the second processing module, when definite spectral efficiency values corresponding to described TM3 is less than the 3rd threshold value of setting, switch to TM7 by TM3;
If user terminal does not support that SRS sends in turn, described the first processing module or described the second processing module, when definite spectral efficiency values corresponding to described TM3 is less than the 4th threshold value of setting, switch to TM7 by TM3.
By this processing method, when the first processing module or the second processing module switch to the TM3 transmission, still can avoid the frequent switching of transmission mode.
Adopt technical solution of the present invention, can effectively avoid the interface-free resources waste caused due to frequent switching between TM3 and TM7, the problem that total throughout reduces.
The accompanying drawing explanation
Fig. 1 is the flow chart that in the embodiment of the present invention, TM7 switches to TM3 in the LET system;
Fig. 2 is the detail flowchart that when in the embodiment of the present invention, user terminal support SRS sends in turn in the LTE system, TM7 switches to TM3;
Fig. 3 be when in the embodiment of the present invention, in the LTE system, user terminal does not support that SRS sends in turn TM7 to the detail flowchart of TM3 switching;
Fig. 4 is the flow chart that in the embodiment of the present invention, TM3 switches to TM7 in the LET system;
Fig. 5 is at the switching device shifter structural representation of LTE system transmission mode in the embodiment of the present invention.
Embodiment
In order to solve the interface-free resources because between the different TM3 of generation of channel scene and TM7, frequent switching causes existed in prior art, waste, the problem that total throughout reduces, when network side adopts transmission mode TM7 to carry out transfer of data, at first judge whether user terminal is supported to survey with reference signal (Sounding Reference Signal, SRS) send in turn, if, determining that spectral efficiency values corresponding to described TM7 is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter is during lower than the second threshold value of setting, switch to TM3 by TM7, otherwise, be more than or equal to the first threshold value of setting in definite spectral efficiency values corresponding to described TM7, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated.
Consult shown in Fig. 1, in the LTE system, TM7 comprises to the concrete handling process of TM3 switching:
Step 101: network side adopts transmission mode TM7 to carry out transfer of data.
Determine that the method that network side adopts TM7 to carry out transfer of data has three kinds, comprising: network side and end side appoint that transmission mode, the network side of selection initiatively select suitable transmission mode and end side to report selected transmission mode.
In like manner, determine that the method that network side adopts TM3 to carry out transfer of data is also so, do not repeat them here.
Step 102: network side judges whether user terminal supports that SRS sends in turn, if carry out step 103; Otherwise, carry out step 104.
Wherein, the signal that network side sends according to the user side received judges whether user terminal supports SRS wheel flow transmission.
Step 103: network side determines that spectral efficiency values that TM7 is corresponding is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter switches to TM3 by TM7 during lower than the second threshold value of setting.
Step 104: network side determines that the spectral efficiency values that TM7 is corresponding is more than or equal to the first threshold value of setting, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
Based on technique scheme, to consult shown in Fig. 2, in the embodiment of the present invention, network side determines that when user terminal supports that SRS sends in turn, the detailed process that carries out the transmission mode switching is as follows:
Step 201: network side determines that current transmission mode is TM7, and user terminal supports that SRS sends in turn.
Step 202: network side calculates current channel relevancy parameter, sees shown in formula one and formula two:
R=H'*H formula one
In formula, the channel condition information that H is 8*2, R is channel correlation matrix.
Channel correlation matrix is carried out to singular value decomposition (Sigular Value Decomposition, SVD), obtain two characteristic values, λ 1 and λ 2, wherein, λ 1 >=λ 2.
N=λ 1/ λ 2 formula two
In formula, N is the channel relevancy parameter.
If the value of λ 1/ λ 2 is greater than the second threshold value of setting, think that channel relevancy is high, otherwise, think that channel relevancy is low.
Step 203: network side calculates spectral efficiency values corresponding to TM7, sees shown in formula three:
Eff_all_tm7=eff_all_tm7+eff_out formula three
In formula, eff_all_tm7 refers to the spectrum efficiency summation under the TM7 pattern, and eff_out refers to the spectral efficiency values of space frequency block coding under the TM7 pattern (Space Frequency Block Code, SFBC) or single antenna port PO RT5.
In practical operation, step 202 and step 203 be order in no particular order, both can first calculate current channel relevancy parameter and calculate again the spectral efficiency values that TM7 is corresponding, also can first calculate the spectral efficiency values that TM7 is corresponding and calculate again current channel relevancy parameter, can also carry out two steps simultaneously.
Step 204: network side judges that whether current channel relevancy parameter is lower than the second threshold value of setting, if carry out step 205; Otherwise, carry out step 208.
Step 205: network side judges whether spectral efficiency values that TM7 is corresponding reaches the first threshold value of setting, if carry out step 206; Otherwise, carry out step 207.
Step 206: network side switches to TM3 by transmission mode by TM7.。
Step 207: network side does not switch transmission mode, still adopts TM7 to be transmitted.
Step 208: network side does not switch transmission mode, still adopts TM7 to be transmitted.
Obtain channel relevancy higher than the second threshold value by step 204, even if system adopts the TM7 transmission performance good so, network side does not switch to TM3 yet, but continues to adopt TM7 to be transmitted.
Based on technical scheme shown in Fig. 1, in the embodiment of the present invention, network side is determined when user terminal does not support that SRS sends in turn, safeguards and forbids toggle count device, pattern translation register and switching identifier.
Forbid the toggle count device: for recording the number of times of carrying out the judgement whether transmission mode switch, the judgement whether transmission mode of every execution is switched, forbid that the value of toggle count device all will be upgraded.When system is initial, need to carry out initialization to forbidding the toggle count device.
The pattern translation register: for recording the judged result after each execution transmission mode switching judging, in the pattern translation register, have the switching designator (as, 1) and non-switching designator (as, 0).The pattern translation register has fixing length, is similar to stack architecture, and transmission mode switching judging of every execution, just be recorded to up-to-date judged result in the pattern translation register, holding time numerical value at most deleted simultaneously.When system is initial, need to carry out initialization to the pattern translation register, all position is initialized as non-switching designator.
Switching identifier: be used to indicate transmission mode and whether can switch.The switching identifier comprises two kinds of values 0 and 1, and wherein, 0 means not carry out switching, and 1 means to carry out switching.When system is initial, the value that need to switch identifier is set to 0.
Consult shown in Fig. 3, in the embodiment of the present invention, network side determines that when user terminal does not support that SRS sends in turn, the detailed process that carries out the transmission mode switching is as follows:
Step 301: network side determines that current transmission mode is TM7, and user terminal does not support that SRS sends in turn.
Step 302: network side calculates spectral efficiency values corresponding to TM7, specifically sees shown in formula three.
Step 303: the first threshold value of the spectral efficiency values that network side is corresponding by TM7 and setting compares.
Step 304: network side upgrades the value of forbidding the toggle count device.
Network side arranges one and forbids the toggle count device, whether spectral efficiency values corresponding to TM7 of the every judgement of network side is more than or equal to the first threshold value of setting, the value of forbidding the toggle count device is once upgraded, when the value of forbidding the toggle count device until described reaches designated value, determine that the number of times of forbidding switching reaches setting threshold.
The update mode of forbidding the toggle count device has multiple:
For example, whether spectral efficiency values corresponding to TM7 of the every judgement of network side is more than or equal to the first threshold value of setting, the value of forbidding the toggle count device is added to 1, and the designated value of forbidding the value of toggle count device is set to one and is greater than 0 integer, such as 8.If forbid that the initial value of toggle count device is 0, whether spectral efficiency values corresponding to TM7 of the every judgement of network side is more than or equal to the first threshold value of setting, the value of forbidding the toggle count device is added to 1, until forbid that the value of toggle count device is 8, while reaching designated value, determine that the number of times of forbidding switching reaches setting threshold.
Again for example, whether spectral efficiency values corresponding to TM7 of the every judgement of network side is more than or equal to the first threshold value of setting, the value of forbidding the toggle count device is subtracted to 1, forbids that the designated value of the value of toggle count device is set to 0.If forbid that the initial value of toggle count device is 8, whether spectral efficiency values corresponding to TM7 of the every judgement of network side is more than or equal to the first threshold value of setting, the value of forbidding the toggle count device is subtracted to 1, until forbid that the value of toggle count device is 0, while reaching designated value, determine that the number of times of forbidding switching reaches setting threshold.
In the embodiment of the present invention, what forbid the employing of toggle count device is the second update mode.
Step 305: the network side judgement forbids whether the toggle count device reaches the threshold value of setting, if carry out step 306; Otherwise carry out step 312.
In the embodiment of the present invention, due to the update mode of forbidding the toggle count device for subtracting 1, so forbid that the threshold value that the toggle count device is set is 0.
Wherein, in the present embodiment, the network side judgement forbids that the toggle count device reaches threshold value 0, switches identifier and is set to 1; Otherwise network side switches identifier and is set to 0.
Step 306: network side judges whether spectral efficiency values that TM7 is corresponding reaches the first threshold value of setting, if carry out step 307; Otherwise, carry out step 309.
Step 307: network side is upgraded the number of the switching designator of pattern translation register record.
Network side is safeguarded a pattern translation register, and a spectral efficiency values corresponding to TM7 of the every judgement of network side is more than or equal to the first threshold value of setting, and the number of the switching designator the pattern translation register recorded is upgraded; Wherein, the every record of network side is up-to-date designator once, the longest designator of retention time in the pattern translation register is deleted.
Can but be not limited to a kind of this method, in the present embodiment, will switch designator and be made as 1, non-switching designator is made as 0.In this step, the number of the switching designator that the pattern translation register is recorded is upgraded, and by 1, is recorded in the pattern translation register exactly, and the designator that the holding time in the pattern translation register is the longest (can be 0, can be also 1) is deleted simultaneously.
Step 308: network side switches to TM3 by transmission mode by TM7.
Step 309: network side is upgraded the number of the non-switching designator of pattern translation register record.
A spectral efficiency values corresponding to TM7 of the every judgement of network side is less than the first threshold value of setting, the number of the non-switching designator that records in the pattern translation register upgraded, simultaneously also should the puncturing pattern translation register in the holding time designator at most.
In this step, network side is upgraded the number of the non-switching designator that records in the pattern translation register, be about to 0 and be recorded in the pattern translation register, the designator that the holding time in the pattern translation register is the longest (can be 0, can be also 1) is deleted simultaneously.
Step 310: network side does not switch transmission mode, still adopts TM7 to be transmitted.
Step 311: network side is reset to the threshold value of forbidding the toggle count device according to the current number of switching designator.
No matter whether network side is switched transmission mode,, behind step 308 or 309, all will be reset to the threshold value of forbidding the toggle count device.
In the present invention program, the number of switching designator and forbid between the threshold value of toggle count device setting certain corresponding relation.If the switching designator number in the pattern translation register is many, frequently switching between the LTE system transmission mode is described, the problem caused for fear of frequent switching, should be a large numerical value by the threshold value setting of forbidding the toggle count device, to extend the transmission mode switching cycle.
For example when the number of switching designator be 5 to be the number of " 1 " in pattern switching register while being 5, check mapping table, determine and forbid that the threshold value of toggle count device should be made as 7.
Step 312: network side judges whether spectral efficiency values that TM7 is corresponding reaches the first threshold value of setting, if carry out step 313; Otherwise, carry out step 314.
The network side judgement forbids that the toggle count device does not reach setting threshold, can affirm that network side is not switched transmission mode, still will judge the spectral efficiency values that TM7 is corresponding, the number of the designator of mode converter need to be upgraded.Because this numerical response switching whether frequently between the LTE system transmission mode, and forbid the value of the threshold value of toggle count device after being related to.
Step 313: network side is upgraded the number of the switching designator of pattern translation register record.
Network side is upgraded the number of the switching designator of pattern switching register record, and concrete renewal process is with step 307.
Step 314: network side is upgraded the number of the non-switching designator of pattern translation register record.
Network side is upgraded the number of the non-switching designator of pattern translation register record, and concrete renewal process is with step 309.
Step 315: network side is not switched transmission mode, still adopts TM7 to be transmitted.
Based on technical scheme shown in Fig. 1, to consult shown in Fig. 4, in the embodiment of the present invention, after network side switches to TM3 by TM7, when current transmission means is TM3, TM3 comprises to the concrete handling process of TM7 switching:
Step 401: network side switches to TM3 by TM7, determines that current transmission mode is TM3.
Step 402: network side calculates spectral efficiency values corresponding to TM3, sees shown in formula four:
Eff_all_tm3=eff_all_tm3+eff_out formula four
In formula, eff_all_tm3 refers to the spectrum efficiency summation under the TM3 pattern, and eff_out refers to the spectral efficiency values of SFBC under the TM3 pattern or space division multiplexing (Space Division Multiplexing, SDM).
Step 403: network side judges whether user terminal supports that SRS sends in turn, if carry out step 404; Otherwise, carry out step 406.
Wherein, the signal that network side sends according to the user side received judges whether user terminal supports SRS wheel flow transmission.
Step 404: network side judges whether spectral efficiency values that TM3 is corresponding is less than the 3rd threshold value of setting, if carry out step 405; Otherwise, carry out step 406.
Step 405: network side switches to TM7 by transmission mode by TM3.
Step 406: network side is not switched transmission mode, still adopts TM3 to be transmitted.
Step 407: the network side judgement forbids whether the toggle count device reaches setting threshold, if carry out step 408; Otherwise, carry out step 414.
Step 408: network side does not upgrade the value of forbidding the toggle count device.
Forbid the toggle count device reach setting threshold (such as, 0) time, forbid that the value of toggle count device is no longer upgraded.
Step 409: network side judges whether spectral efficiency values that TM3 is corresponding is less than the 4th threshold value of setting, if carry out step 410; Otherwise, carry out step 412.
Wherein, in this step, the 4th threshold value of setting can be identical with the 3rd threshold value of mentioning in step 404, also can be set to not identical.In the present embodiment, these two threshold value numerical value are identical.
Step 410: network side is upgraded the number of the switching designator of pattern translation register record.
While with current transmission mode, being TM7, step 307 is similar, in this step, the number of the switching designator that the pattern translation register is recorded is upgraded, by 1, be recorded in the pattern translation register exactly, the designator that holding time in the pattern translation register is the longest (can be 0, can be also 1) is deleted simultaneously.
Step 411: network side switches to TM7 by transmission mode by TM3.
Step 412: network side is upgraded the number of the non-switching designator of pattern translation register record.
While with current transmission mode, being TM7, step 309 is similar, in this step, the number of the non-switching designator that the pattern translation register is recorded is upgraded, by 0, be recorded in the pattern translation register exactly, the designator that holding time in the pattern translation register is the longest (can be 0, can be also 1) is deleted simultaneously.
Step 413: network side is not switched transmission mode, still adopts TM3 to be transmitted.
Step 414: network side upgrades the value of forbidding the toggle count device.
The every judgement of network side once forbids whether the toggle count device reaches setting threshold, all will be to forbidding that the toggle count device is upgraded, and detailed process is with step 408, and network side will forbid that the value of toggle count device subtracts 1.
Based on above-described embodiment, to consult shown in Fig. 5, in the embodiment of the present invention, the switching device shifter based on the LTE system transmission mode comprises judge module 501, the first processing module 502 and the second processing module 503, wherein,
The first processing module 502, after at judge module 501, determining that user terminal supports that SRS sends in turn, determining that spectral efficiency values corresponding to TM7 is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter during lower than the second threshold value of setting, switches to TM3 by TM7;
The second processing module 503, after at judge module 501, determining that user terminal does not support that SRS sends in turn, in definite spectral efficiency values corresponding to TM7, be more than or equal to the first threshold value of setting, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
The first processing module 502 adopts following formula to calculate current channel relevancy parameter:
N=λ1/λ2
Wherein, λ 1 and λ 2 are for to carry out to channel correlation matrix two characteristic values that obtain after singular value decomposition SVD, and λ 1 >=λ 2.
The second processing module 503 determines that the number of times of forbidding switching reaches setting threshold, comprising:
The second processing module 503 arranges one and forbids the toggle count device, whether the spectral efficiency values that TM7 of every judgement is corresponding is more than or equal to the first threshold value of setting, the value of forbidding the toggle count device is once upgraded, until while forbidding that the value of toggle count device reaches designated value, determine that the number of times of forbidding switching reaches setting threshold.
The second processing module 503 further comprises:
The second processing module 503 is safeguarded a pattern translation register, a spectral efficiency values corresponding to TM7 of every judgement is more than or equal to the first threshold value of setting, the number of the switching designator the pattern translation register recorded is upgraded, and a spectral efficiency values corresponding to TM7 of every judgement is less than the first threshold value of setting, the number of the non-switching designator the pattern translation register recorded is upgraded, wherein, every record is up-to-date designator once, the longest designator of retention time in the pattern translation register is deleted.
After the second processing module 503 determines that the number of times of forbidding switching reaches setting threshold, according to the current number of switching designator, the designated value of forbidding the toggle count device is reset.
After the first processing module 502 or the second processing module 503 switch to TM3 by TM7, further comprise:
If user terminal supports that SRS sends in turn, the first processing module 502 or the second processing module 503, when definite spectral efficiency values corresponding to TM3 is less than the 3rd threshold value of setting, switch to TM7 by TM3;
If user terminal does not support that SRS sends in turn, the first processing module 502 or the second processing module 503, when definite spectral efficiency values corresponding to TM3 is less than the 4th threshold value of setting, switch to TM7 by TM3.
In sum, by the method to the switching of LTE system transmission mode provided in the embodiment of the present invention, no matter whether the LTE system supports that SRS sends in turn, the transmission means that also no matter the LTE system is selected is TM7 or TM3, system can solve the problem of frequent switching between LTE system TM7 and TM3, thereby can avoid, because of the interface-free resources waste that the frequent switching of transmission mode causes, the problem that total throughout reduces, having improved the efficiency of transmission of system.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the embodiment of the present invention the embodiment of the present invention.Like this, if within these of the embodiment of the present invention are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the changing method based on Long Term Evolution LTE system transmission mode, is characterized in that, comprising:
When network side adopts transmission mode TM7 to carry out transfer of data, judge whether user terminal supports detection to send in turn with reference signal SRS;
If network side is determining that spectral efficiency values corresponding to described TM7 is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter switches to TM3 by TM7 during lower than the second threshold value of setting;
Otherwise network side is more than or equal to the first threshold value of setting in definite spectral efficiency values corresponding to described TM7, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
2. the method for claim 1, is characterized in that, network side adopts following formula to calculate current channel relevancy parameter:
N=λ1/λ2
Wherein, λ 1 and λ 2 are for to carry out to channel correlation matrix two characteristic values that obtain after singular value decomposition SVD, and λ 1 >=λ 2.
3. the method for claim 1, is characterized in that, network side determines that the number of times of forbidding switching reaches setting threshold, comprising:
Network side arranges one and forbids the toggle count device, whether the every judgement of the network side spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, to described, forbid that the value of toggle count device once upgrades, when the value of forbidding the toggle count device until described reaches designated value, determine that the number of times of forbidding switching reaches setting threshold.
4. method as claimed in claim 3, is characterized in that, further comprises:
Network side is safeguarded a pattern translation register, the every judgement of the network side spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, the number of the switching designator described pattern translation register recorded is upgraded, and a spectral efficiency values corresponding to TM7 of the every judgement of network side is less than the first threshold value of setting, the number of the non-switching designator described pattern translation register recorded is upgraded, wherein, the every record of network side is up-to-date designator once, the longest designator of retention time in the pattern translation register is deleted.
5. method as claimed in claim 4, is characterized in that, after determining that the number of times of forbidding switching reaches setting threshold, network side forbids that to described the designated value of toggle count device is reset according to the current number of described switching designator.
6. as the described method of claim 1-5 any one, it is characterized in that, network side further comprises after switching to TM3 by TM7:
If user terminal supports that SRS sends in turn, network side, when definite spectral efficiency values corresponding to described TM3 is less than the 3rd threshold value of setting, switches to TM7 by TM3;
If user terminal does not support that SRS sends in turn, network side, when definite spectral efficiency values corresponding to described TM3 is less than the 4th threshold value of setting, switches to TM7 by TM3.
7. the switching device shifter based on the LTE system transmission mode, is characterized in that, comprising:
Judge module, for when network side employing transmission mode TM7 carries out transfer of data, judge whether user terminal supports that SRS sends in turn;
The first processing module, after at definite user terminal, supporting that SRS sends in turn, determining that spectral efficiency values corresponding to described TM7 is more than or equal to the first threshold value of setting, and the value of current channel relevancy parameter switches to TM3 by TM7 during lower than the second threshold value of setting;
The second processing module, after at definite user terminal, not supporting that SRS sends in turn, be more than or equal to the first threshold value of setting in definite spectral efficiency values corresponding to described TM7, and the number of times of forbidding switching switches to TM3 by TM7 while reaching setting threshold.
8. device as claimed in claim 7, is characterized in that, described the first processing module adopts following formula to calculate current channel relevancy parameter:
N=λ1/λ2
Wherein, λ 1 and λ 2 are for to carry out to channel correlation matrix two characteristic values that obtain after singular value decomposition SVD, and λ 1 >=λ 2.
9. device as claimed in claim 7, is characterized in that, described the second processing module determines that the number of times of forbidding switching reaches setting threshold, comprising:
Described the second processing module arranges one and forbids whether the every judgement of the toggle count device spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, to described, forbid that the value of toggle count device once upgrades, when the value of forbidding the toggle count device until described reaches designated value, determine that the number of times of forbidding switching reaches setting threshold.
10. device as claimed in claim 9, is characterized in that, further comprises:
Described the second processing module is safeguarded a pattern translation register, every judgement spectral efficiency values that once described TM7 is corresponding is more than or equal to the first threshold value of setting, the number of the switching designator described pattern translation register recorded is upgraded, and a spectral efficiency values corresponding to TM7 of every judgement is less than the first threshold value of setting, the number of the non-switching designator described pattern translation register recorded is upgraded, wherein every record up-to-date designator once, deleted the longest designator of retention time in the pattern translation register.
11. device as claimed in claim 10, is characterized in that, after determining that the number of times of forbidding switching reaches setting threshold, described the second processing module forbids that to described the designated value of toggle count device is reset according to the current number of described switching designator.
12. as the described device of claim 7-11 any one, it is characterized in that, after described the first processing module or described the second processing module switch to TM3 by TM7, further comprise:
If user terminal supports that SRS sends in turn, described the first processing module or the second processing module, when definite spectral efficiency values corresponding to described TM3 is less than the 3rd threshold value of setting, switch to TM7 by TM3;
If user terminal does not support that SRS sends in turn, when described the first processing module or the second processing module spectral efficiency values corresponding at TM3 are less than the 4th threshold value of setting, by TM3, switch to TM7.
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