CN101742628B - Method for reducing interference of uplink reference symbol - Google Patents
Method for reducing interference of uplink reference symbol Download PDFInfo
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- CN101742628B CN101742628B CN 200810227137 CN200810227137A CN101742628B CN 101742628 B CN101742628 B CN 101742628B CN 200810227137 CN200810227137 CN 200810227137 CN 200810227137 A CN200810227137 A CN 200810227137A CN 101742628 B CN101742628 B CN 101742628B
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Abstract
The invention discloses a method for reducing the interference of an uplink reference symbol. The method comprises the following steps that: user equipment (UE) determines whether to send uplink reference symbols within the preset time slot according to the current path loss difference or the currently-received uplink load indication parameter of the neighboring cell; the base station of the serving cell of the UE judges whether the UE sends the uplink reference symbol within the preset time to the base station according to the current path loss difference or the currently-received uplink load indication parameter of the neighboring cell. By utilizing the path loss difference or the uplink load indication parameter, the method ensures that the UE can realize the open-loop power control of the uplink reference symbol, thereby reducing the interference of the uplink reference symbol.
Description
Technical field
The present invention relates to the interference control technology in the wireless communication system, particularly relate to a kind of method that uplink reference symbol disturbs that reduces.
Background technology
In the existing wireless communications system, UE can produce neighbor cell and disturb when sending data to its Serving cell, causes noise rise (Rise over Thermo, RoT) rising of index of neighbor cell.Described RoT is a up important system index of wireless communication system, and the co-channel interference that the expression system causes self is what times of white noise.Described interference comprises that the UE of subscriber equipment (UE) that Serving cell is controlled and neighbor cell control causes interference.
Cell edge UE is carried out suitable power mandate or power control, is an important means that suppresses uplink interference.In the existing wireless communications system, UE can report path loss, path loss difference, and (Serving andNeighbour cell Pathloss SNPL) waits measured value to give the base station, carries out the power mandate of UE and the control of up RoT with assistant base station.The measured value of the adjacent cell base station information that Serving cell reports according to UE, can judge the current geographical position of UE is center of housing estate or cell edge, and this UE estimated the disturbed condition of this neighbour residential quarter, adjust the power mandate of UE accordingly, control UE is to the interference of adjacent residential quarter, and with descending control means of signaling notice UE, thereby reach control this residential quarter UE to the purpose of adjacent area interference.
What proposed at present disturbs the means of control mainly to comprise to cell edge UE: methods such as open loop power control, closed-loop power control, presence of intercell interference control.Wherein, closed-loop power control and presence of intercell interference control need explicitly to send control information at down physical channel, realize the control to UE; And for open loop power control, owing to be that UE self controls, then do not need the existence of down physical channel.
Existing wireless communication system has been introduced uplink reference symbol (Souding RS) in uplink, this uplink reference symbol is used for assistant base station and carries out the estimation of up channel, different for the demodulation reference mark of auxiliary data demodulation with the companion data transmission, this uplink reference symbol does not have the down control channel of pairing.Therefore, for the transmission of uplink reference symbol, can only adopt the method realization of open loop control to the control of its transmitting power, to reduce it to the interference of adjacent residential quarter.
At present, a kind of technical scheme that uplink reference symbol disturbs that reduces is not proposed as yet.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that can reduce the uplink reference symbol interference.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of method that reduces the uplink reference symbol interference may further comprise the steps:
A, user equipment (UE) determine whether to send uplink reference symbol in preset time slot according to current path loss difference and preset threshold value;
The base station in service sector of b, described UE is according to the current described path loss difference that reports of described UE and described preset threshold value, judged before receiving the path loss difference that described UE reports next time, described UE at default time slot whether to its transmission uplink reference symbol.
Preferably, described path loss difference is the path loss difference of base station in service sector and adjacent cell base station;
Described step a is:
Described UE judge current described path loss difference whether less than or be not more than described preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot;
Described step b is:
The base station in service sector of described UE judge the current described path loss difference that reports of described UE whether less than or be not more than described preset threshold value, if, then judged before receiving the path loss difference that described UE reports next time, described UE will send uplink reference symbol to it at default time slot, otherwise, judgement is before receiving the path loss difference that described UE reports next time, and described UE does not send uplink reference symbol to it at default time slot.
Preferably, described path loss difference is the path loss difference of adjacent cell base station and base station in service sector;
Described step a is:
Described UE judges whether current described path loss difference is greater than or not less than described preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot;
Described step b is:
The base station in service sector of described UE judges whether the current described path loss difference that reports of described UE is greater than or not less than described preset threshold value, if, then judged before receiving the path loss difference that described UE reports next time, described UE will send uplink reference symbol to it at default time slot, otherwise, judgement is before receiving the path loss difference that described UE reports next time, and described UE will not send uplink reference symbol to it at default time slot.
Preferably, further comprise before the described step a:
X, system set up the mapping table of the transmitting power of path loss difference and uplink reference symbol in advance, and default in described UE and the described base station in service sector, described path loss difference is the path loss difference of adjacent cell base station and base station in service sector or the path loss difference of base station in service sector and adjacent cell base station;
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, path loss difference was more big described in this mapping table, and corresponding transmitting power is more big;
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, path loss difference was more big described in this mapping table, and corresponding transmitting power is more little;
Further comprise between described step a and the b:
Y, determine when default time slot sends uplink reference symbol, according to described mapping table and current described path loss difference, to determine the transmitting power of described uplink reference symbol as described UE.
Preferably, further comprise before the described step a:
System sets up the mapping table of the transmitting power of ascending load indication parameter and uplink reference symbol in advance, and defaults in described UE and the base station, and the transmitting power of the more little then correspondence of ascending load indication parameter is more big in the described mapping table; Described ascending load indication parameter is noise rise RoT parameter or Interference Signal Code Power ISCP parameter;
Further comprise between described step a and the b:
Y, determine when default time slot sends uplink reference symbol, according to described mapping table and the current described ascending load indication parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol as described UE.
The invention provides the another kind of method that uplink reference symbol disturbs that reduces, this method may further comprise the steps:
A, UE judge current reception adjacent residential quarter the ascending load indication parameter whether less than or be not more than predetermined threshold value, if, then send uplink reference symbol at default time slot, otherwise do not send uplink reference symbol at default time slot, described ascending load indication parameter is RoT parameter or ISCP parameter;
The ascending load indication parameter that the base station in service sector of b, described UE is judged current described adjacent residential quarter whether less than or be not more than predetermined threshold value, if, then judged before receiving the ascending load indication parameter of described adjacent residential quarter next time, described UE sends uplink reference symbol at default time slot to it, otherwise judge that before receiving the ascending load indication parameter of described adjacent residential quarter, described UE does not send uplink reference symbol to it at default time slot next time.
Preferably, further comprise before the described step a:
System sets up the mapping table of the transmitting power of path loss difference and uplink reference symbol in advance, and default in described UE and the described base station in service sector, described path loss difference is the path loss difference of adjacent cell base station and base station in service sector or the path loss difference of base station in service sector and adjacent cell base station;
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, path loss difference was more big described in this mapping table, and corresponding transmitting power is more big;
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, path loss difference was more big described in this mapping table, and corresponding transmitting power is more little;
Further comprise between described step a and the b:
When described UE determines according to described mapping table and current described path loss difference, to determine the transmitting power of described uplink reference symbol when default time slot sends uplink reference symbol.
Preferably, further comprise before the described step a:
X, system set up the mapping table of the transmitting power of RoT parameter and uplink reference symbol in advance, and default in described UE and the base station, and the transmitting power of the more little then correspondence of RoT parameter is more big in the described mapping table;
Further comprise between described step a and the b:
Y, determine when default time slot sends uplink reference symbol, according to described mapping table and the current described RoT parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol as described UE.
Preferably, further comprise before the described step a:
X, system set up the mapping table of the transmitting power of ISCP parameter and uplink reference symbol in advance, and default in described UE and the base station, and the transmitting power of the more little then correspondence of ascending load parameter is more big in the described mapping table;
Further comprise between described step a and the b:
Y, determine when default time slot sends uplink reference symbol, according to described mapping table and the current described ISCP parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol as described UE.
In sum, the method that reduction uplink reference symbol of the present invention disturbs, utilize path loss difference or ascending load indication parameter etc., make UE carry out open loop power control to the transmission of uplink reference symbol, that is: UE does not need the power control signaling that issues according to the base station, and the transmission of the above-mentioned parameter that is only obtained by himself control uplink reference symbol, and can this control be consistent with the base station, thereby can effectively reduce the interference that uplink reference symbol produces.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of the invention one;
Fig. 2 is the schematic diagram of the embodiment of the invention two.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Main thought of the present invention is: for uplink reference symbol since not with the down physical channel of its pairing, therefore can only reduce the interference that it produces by the method for open loop power control in transmission course.In the existing protocol, physical channel measurement parameter (the path loss that comprises Serving cell that UE measures by self, the path loss difference of adjacent cell base station and Serving cell etc.) and the base station by the down channel of eating dishes without rice or wine issue ascending load indication parameter (comprising ISCP parameter and ROT parameter), the interference level that can reflect the residential quarter directly or indirectly, like this, the present invention can utilize the relation of above-mentioned parameter and interference level, transmission according to above-mentioned parameter control uplink reference symbol, when namely the interference that reflects when a certain parameter value is excessive, to can not send described uplink reference symbol in preset time slot, to avoid the interference that transmission was produced of uplink reference symbol.
In order further to improve effect of the present invention, can also set up the different numerical value of any one above-mentioned parameter and the mapping relations of different transmission power in advance, make that UE can be according to the above-mentioned parameter of described mapping relations and current acquisition, transmitting power size to uplink reference symbol is done further control, to reduce the interference that transmission was produced of uplink reference symbol to a greater degree.
Below by a plurality of specific embodiments of the present invention, the specific implementation of foregoing invention thought is elaborated.
The embodiment of the invention one is utilized the transmission of path loss difference control uplink reference symbol.Fig. 1 is the flow chart of the embodiment of the invention one.As shown in Figure 1, this embodiment mainly may further comprise the steps:
Here, described preset time slot is the time slot that is used for sending uplink reference symbol that system configuration is given described UE.By this step, can make UE according to current path loss difference and preset threshold value, determined before obtaining new path loss difference next time, whether utilize this preset time slot to send uplink reference symbol.
Need to prove that in the existing system, UE can be notified to its base station in service sector with path loss or the path loss difference of adjacent residential quarter.In actual applications, described path loss difference can be the path loss difference of adjacent cell base station and base station in service sector, also can be the path loss difference of base station in service sector and adjacent cell base station, because the value of the former with the latter is opposite, make that the specific implementation method of this step is also different, specific as follows along with the two difference:
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, this step specific implementation method was:
Described UE judge current described path loss difference whether less than or be not more than preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot.
Here, when described path loss difference less than or when being not more than preset threshold value, illustrate that the interference level of adjacent cell base station is less, it is little to the influence of adjacent residential quarter UE that send uplink reference symbol this moment, therefore, can send uplink reference symbol; And be not less than or during greater than preset threshold value when described path loss difference, the interference level that adjacent cell base station then is described is higher, at this moment, need stop to send uplink reference symbol, further increase the interference level of adjacent cell base station with the transmission of avoiding uplink reference symbol, influence the communication quality of adjacent residential quarter UE.
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, this step specific implementation method was:
Described UE judges whether current described path loss difference is greater than or not less than preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot;
Here, when described path loss difference is greater than or not less than preset threshold value, illustrate that the interference level of adjacent cell base station is less, can send uplink reference symbol; And be not more than or illustrate that the interference level of adjacent cell base station is higher during less than preset threshold value when described path loss difference, at this moment, need stop to send uplink reference symbol.
Preferably, when described threshold value is set to 0 and described path loss difference when being the path loss difference of adjacent cell base station and base station in service sector, the specific implementation of this step can method be:
Described UE judges whether current described path loss difference is not less than preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot.
In the practical application, the described threshold value in this step is predefined according to the practical application needs by system, and known for UE and base station, its value is not limited to 0.
The base station in service sector of step 102, described UE is according to current described path loss difference and the preset threshold value that reports of described UE, judged before receiving the path loss difference that described UE reports next time, described UE at default time slot whether to its transmission uplink reference symbol.
By step 102, the base station in service sector of described UE is judged to receive the current path loss difference that reports of described UE and is receiving in the time interval of the path loss difference that described UE reports next time, whether described UE sends uplink reference symbol at default time slot to it, and then can need determine whether the startup of notification channel estimation module to the detection of the uplink reference symbol of described UE according to this judged result.Particularly, when described base station according to the current described path loss difference that reports of described UE and described threshold value, judged before receiving the path loss difference that described UE reports next time, described UE will be when preset time slot send uplink reference symbol, can the notification channel estimation module stop the uplink reference symbol of described UE is detected, to avoid the false-alarm of this uplink reference symbol, and work as described base station according to the current described path loss difference that reports of described UE and described threshold value, judged before receiving the path loss difference that described UE reports next time, described UE can be when preset time slot sends uplink reference symbol, then can the notification channel estimation module start the detection to the uplink reference symbol of described UE, to avoid the omission to uplink reference symbol.
In this step, described base station judges whether described UE is identical with step 101 to its concrete grammar that sends uplink reference symbol at default time slot, that is, the mode that compares by the described path loss difference that described UE is reported and the described threshold value of presetting realizes that concrete grammar is:
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, the specific implementation method of step 102 was:
The base station in service sector of described UE judge the current described path loss difference that reports of described UE whether less than or be not more than preset threshold value, if, then judged before receiving the path loss difference that described UE reports next time, described UE sends uplink reference symbol at default time slot to it, otherwise, judgement is before receiving the path loss difference that described UE reports next time, and described UE does not send uplink reference symbol to it at default time slot.
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, the specific implementation method of step 102 was:
The base station in service sector of described UE judges whether the current described path loss difference that reports of described UE is greater than or not less than preset threshold value, if, then judged before receiving the path loss difference that described UE reports next time, described UE sends uplink reference symbol at default time slot to it, otherwise, judgement is before receiving the path loss difference that described UE reports next time, and described UE does not send uplink reference symbol to it at default time slot.
By above-mentioned steps 101 and 102, both can make UE self according to the interference level of adjacent residential quarter, to whether controlling at default time slot transmission uplink reference symbol.Can make the base station know accurately whether UE can send uplink reference symbol at default time slot again, guaranteed whether UE and base station send uplink reference symbol to UE and be consistent, make subsequent communication channel estimate normally to be carried out, avoided because the one-sided control that the UE side sends uplink reference symbol, and to the detection Effect on Performance of channel estimation module, thereby make the present invention and existing system obtain good compatibility.
Reduce the uplink reference symbol effects of jamming in order further to improve present embodiment, when UE determines can be when default time slot sends described uplink reference symbol, described UE can also utilize current path loss difference or ascending load indication parameter (ROT parameter or ISCP parameter), according to the above-mentioned parameter of setting up in advance and the mapping table of transmitting power value, determine the transmitting power of uplink reference symbol.To this be elaborated respectively at above-mentioned different parameter below.
When utilizing path loss difference to determine transmitting power big or small, embodiment one can further include following step:
System sets up the mapping table of the transmitting power of path loss difference and uplink reference symbol in advance, and defaults in described UE and the described base station in service sector;
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, path loss difference was more big described in this mapping table, and corresponding transmitting power is more big;
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, path loss difference was more big described in this mapping table, and corresponding transmitting power is more little;
Further comprise between the described step 101 and 102:
When described UE determines according to described mapping table and current described path loss difference, to determine the transmitting power of described uplink reference symbol when default time slot sends uplink reference symbol.
In actual applications, described mapping table in the above-mentioned steps can be set up according to the practical application needs by those skilled in the art, path loss difference may be different with the mapping function of transmitting power in the described mapping table under the different applied environments, but, above-mentioned identical point can not change, and namely the transmitting power of the more big correspondence of path loss difference is more little or more big.For simplicity, be that example is explained with table 1 below.
Q(dB) P(dBm)
Q<-6 X
-6≤Q<-5 X+1
-5≤Q<-4 X+2
-4≤Q<-3 X+3
-3≤Q<-2 X+4
-2≤Q<-1 X+5
-1≤Q<-0 X+6
0≤Q<1 X+7
1≤Q<2 X+8
2≤Q<3 X+9
3≤Q<4 X+10
4≤Q<5 X+11
5≤Q<6 X+12
6≤Q<7 X+13
7≤Q<8 X+14
8≤Q<9 X+15
9≤Q<10 X+16
10≤Q<11 X+17
11≤Q<12 X+18
12≤Q<13 X+19
13≤Q<14 X+20
14≤Q<15 X+21
15≤Q<16 X+22
16≤Q<17 X+23
17≤Q<18 X+24
18≤Q<19 X+25
19≤Q<20 X+26
20≤Q<21 X+27
21≤Q<22 X+28
22≤Q<23 X+29
23≤Q<24 X+30
24≤Q<25 X+31
Table 1
Q represents the path loss difference of adjacent cell base station and base station in service sector in the table 1, and P represents the transmitting power of uplink reference symbol, and X represents reference transmit power.Find out easily from table 1: the path loss difference of adjacent cell base station and base station in service sector is more big, and the performance number of corresponding uplink reference symbol is more big.
When utilizing the ascending load indication parameter to determine transmitting power big or small, embodiment one can further include following step:
System sets up the mapping table of the transmitting power of ascending load indication parameter and uplink reference symbol in advance, and defaults in described UE and the base station, and the ascending load indication parameter is more big in the described mapping table, and corresponding transmitting power is more little; Described ascending load indication parameter is RoT parameter or ISCP parameter;
Further comprise between the described step 101 and 102:
When described UE determines according to described mapping table and the current described ascending load indication parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol when default time slot sends uplink reference symbol.
In actual applications, described mapping table in the above-mentioned steps can be set up according to the practical application needs by those skilled in the art, the mapping function of setting up described mapping table under the different applied environments may be different, but the more little characteristics of the emission merit of the more big correspondence of above-mentioned ascending load indication parameter are with constant.
For example, for the mapping table of the transmitting power of ISCP parameter and uplink reference symbol, its mapping function can for:
P
1=P
0+ ISCP
Surplus,
Wherein, P
1Be the transmitting power of uplink reference symbol, P
0Be reference transmit power, ISCP
SurplusInterference margins for this UE.This ISCP
SurplusInterference margins is actual value poor of the thresholding of ISCP of base station and ISCP.The thresholding of the ISCP of base station is a preset value, and the actual value of ISCP is the ascending load indication parameter of base station from eating dishes without rice or wine to send.
For example, when the ISCP of adjacent cell base station thresholding is-100dBm, but the ISCP actual value that should the actual measurement of neighbour's cell base station arrives is during for-102dB, then should neighbour's cell base station still has the interference margins of 2dB.At this moment, the UE that carries out open loop power control can improve 2dB with transmitting power.Need to prove that under multi-user's scene, the ISCP surplus that every UE can only distribution portion, the ISCP surplus method of salary distribution that specifically can adopt determine by the base station, and be that those skilled in the art are known, do not repeat them here.
The RoT parameter is similar to the mapping function of the mapping table of the transmitting power of uplink reference symbol to above-mentioned ISCP parameter to the mapping function of the mapping table of the transmitting power of uplink reference symbol, its difference only is to have increased in the mapping function of described RoT parameter a fixing constant, fixedly constant does not repeat them here for the performance number that in the band make an uproar in the end.
Here need to prove, in actual applications, when described UE determines can also determine the transmitting power of uplink reference symbol according to the described ascending load indication parameter of base station in service sector when default time slot sends uplink reference symbol.Perhaps, take all factors into consideration the described ascending load indication parameter of adjacent cell base station and base station in service sector, determine the transmitting power of uplink reference symbol.For example, based on the described ascending load indication parameter of adjacent cell base station, be that the mode of assisting realizes with the described ascending load indication parameter of base station in service sector.The load that reflects adjacent residential quarter when the described ascending load indication parameter of adjacent cell base station hour, when namely being lower than a predetermined threshold value, do not need to consider to the transmission of the uplink reference symbol influence to adjacent residential quarter, at this moment, can determine transmitting power according to the ascending load indication parameter of base station in service sector, and when the described ascending load indication parameter of adjacent cell base station reflects that the load of adjacent residential quarter is big, when namely being higher than a predetermined threshold value, need to consider the transmission of the uplink reference symbol influence to adjacent residential quarter, at this moment, will preferentially determine transmitting power according to the ascending load indication parameter of adjacent cell base station.
In above-described embodiment one, UE determines whether to send uplink reference symbol according to path loss difference, and in the practical application, the watt level in the time of can also utilizing current circuit loss value to the transmission of uplink reference symbol and transmission is controlled, because method is similar to this embodiment, for simplicity repeats no more.
The embodiment of the invention two is utilized the transmission of the ascending load indication parameter control uplink reference symbol of adjacent residential quarter.Fig. 2 is the flow chart of the embodiment of the invention two.As shown in Figure 2, this embodiment mainly may further comprise the steps:
Here, described preset time slot is the time slot that is used for sending uplink reference symbol that system configuration is given described UE.By this step, can make UE according to ascending load indication parameter and the preset threshold value of current adjacent residential quarter, determined before obtaining the new ascending load indication parameter of adjacent residential quarter next time, whether utilize this preset time slot to send uplink reference symbol.
Described ascending load indication parameter is RoT parameter or ISCP parameter, is to be handed down to UE's by the base station by the down channel of eating dishes without rice or wine.
Here, when described ascending load indication parameter less than or when being not more than preset threshold value, illustrate that the load of adjacent cell base station is lower, it is little to the influence of adjacent residential quarter UE that send uplink reference symbol this moment, therefore, can send uplink reference symbol; And be not less than or during greater than preset threshold value when described ascending load indication parameter, the load that adjacent cell base station then is described is higher, at this moment, need stop to send uplink reference symbol, further increase the interference level of adjacent cell base station with the transmission of avoiding uplink reference symbol, influence the communication quality of adjacent residential quarter UE.
Preferable, when described ascending load indication parameter was the RoT parameter, described threshold value was set to 5dB, and when described ascending load indication parameter was the ISCP parameter, described threshold value was set to-100dBm, and correspondingly, this step is specially:
UE judges whether the ascending load indication parameter of the adjacent residential quarter of current reception is not more than preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot;
In the practical application, the described threshold value in this step is predefined according to the practical application needs by system, and known for UE and base station, its value is not limited to above-mentioned example.
It is the ascending load indication parameter according to adjacent residential quarter in the present embodiment, determine whether to send uplink reference symbol, in the practical application, can also be according to different application needs, ascending load indication parameter according to Serving cell determines, perhaps the mode that combines with the ascending load indication parameter of adjacent residential quarter and main plot realizes.For example: judge Serving cell and adjacent residential quarter the ascending load indication information ratio whether less than or be not more than predetermined threshold value, if then send uplink reference symbol at default time slot, otherwise do not send uplink reference symbol at default time slot.
The ascending load indication parameter that the base station in service sector of step 202, described UE is judged current described adjacent residential quarter whether less than or be not more than predetermined threshold value, if, then judged before receiving the ascending load indication parameter of described adjacent residential quarter next time, described UE sends uplink reference symbol at default time slot to it, otherwise, judgement before receiving the ascending load indication parameter of described adjacent residential quarter next time, and described UE does not send uplink reference symbol to it at default time slot.
Need to prove, in the existing system, each base station can be at the load information of eating dishes without rice or wine to broadcast separately, also can exchange ascending load indication parameter separately between the base station, like this, UE and its base station in service sector just can be known the ascending load indication parameter of this neighbour's cell base station, use identical ascending load indication parameter in order to make base station in service sector with UE, and above-mentioned two process needs keep synchronously.In addition, can also utilize UE, the ascending load indication parameter of its adjacent residential quarter of knowing is notified to its base station in service sector.Concrete which kind of form that adopts makes base station in service sector know the load state of adjacent residential quarter, can select according to actual needs.
Here, by step 202, can make the base station in service sector of described UE judge described UE and whether send uplink reference symbol at default time slot to it, and then can be according to its judged result, need to determine whether the notification channel estimation module to start detection to the uplink reference symbol of described UE.Particularly, when described base station according to described ascending load indication parameter and described threshold value, judged before receiving the ascending load indication parameter of described adjacent residential quarter next time, described UE can be when preset time slot send uplink reference symbol, will the notification channel estimation module stop the uplink reference symbol of described UE is detected, to avoid the false-alarm of this uplink reference symbol, and work as described base station according to described ascending load indication parameter and described threshold value, judged before receiving the ascending load indication parameter of described adjacent residential quarter next time, described UE can be when preset time slot sends uplink reference symbol, then can the notification channel estimation module start the detection to the uplink reference symbol of described UE, to avoid the omission to uplink reference symbol.
By above-mentioned steps 201 and 202, both can make UE self according to the load level of adjacent residential quarter, to whether controlling at default time slot transmission uplink reference symbol.Can make the base station know accurately whether UE can send uplink reference symbol at default time slot again, guaranteed whether UE and base station send uplink reference symbol to UE and be consistent, make subsequent communication channel estimate normally to be carried out, avoided because the one-sided control that the UE side sends uplink reference symbol, and to the detection Effect on Performance of channel estimation module, thereby make the present invention and existing system obtain good compatibility.
Reduce the uplink reference symbol effects of jamming in order further to improve present embodiment, when UE determines can be when default time slot sends described uplink reference symbol, described UE can also utilize current path loss difference or ascending load indication parameter (ROT parameter or ISCP parameter), according to the above-mentioned parameter of setting up in advance and the mapping table of transmitting power value, determine the transmitting power of uplink reference symbol.To this be elaborated respectively at above-mentioned different parameter below.
When utilizing path loss difference to determine transmitting power big or small, embodiment two can further include following step:
System sets up the mapping table of the transmitting power of path loss difference and uplink reference symbol in advance, and default in described UE and the described base station in service sector, described path loss difference is the path loss difference of adjacent cell base station and base station in service sector or the path loss difference of base station in service sector and adjacent cell base station;
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, path loss difference was more big described in this mapping table, and corresponding transmitting power is more big;
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, path loss difference was more big described in this mapping table, and corresponding transmitting power is more little;
Further comprise between the described step 201 and 202:
When described UE determines according to described mapping table and current described path loss difference, to determine the transmitting power of described uplink reference symbol when default time slot sends uplink reference symbol.
When utilizing the RoT parameter to determine transmitting power big or small, embodiment two can further include following step:
System sets up the mapping table of the transmitting power of RoT parameter and uplink reference symbol in advance, and defaults in described UE and the base station, and the transmitting power of the more little then correspondence of RoT parameter is more big in the described mapping table;
Further comprise between the described step 201 and 202:
When described UE determines according to described mapping table and the current described RoT parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol when default time slot sends uplink reference symbol.
When utilizing the ISCP parameter to determine transmitting power big or small, embodiment two can further include following step:
System sets up the mapping table of the transmitting power of ISCP parameter and uplink reference symbol in advance, and defaults in described UE and the base station, and the transmitting power of the more little then correspondence of ascending load parameter is more big in the described mapping table;
Further comprise between the described step 201 and 202:
When described UE determines according to described mapping table and the current described ISCP parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol when default time slot sends uplink reference symbol.
Here need to prove, in actual applications, when described UE determines can also determine the transmitting power of uplink reference symbol according to the described ascending load indication parameter (being ROT parameter or ISCP parameter) of base station in service sector when default time slot sends uplink reference symbol.Perhaps, take all factors into consideration the described ascending load indication parameter of adjacent cell base station and base station in service sector, determine the transmitting power of uplink reference symbol.For example, based on the described ascending load indication parameter of adjacent cell base station, be that the mode of assisting realizes with the described ascending load indication parameter of base station in service sector.The load that reflects adjacent residential quarter when the described ascending load indication parameter of adjacent cell base station hour, when namely being lower than a predetermined threshold value, do not need to consider to the transmission of the uplink reference symbol influence to adjacent residential quarter, at this moment, can determine transmitting power according to the ascending load indication parameter of base station in service sector, and when the described ascending load indication parameter of adjacent cell base station reflects that the load of adjacent residential quarter is big, when namely being higher than a predetermined threshold value, need to consider the transmission of the uplink reference symbol influence to adjacent residential quarter, at this moment, will preferentially determine transmitting power according to the ascending load indication parameter of adjacent cell base station.
The concrete method for building up of related mapping table is identical with method in the embodiment of the invention one in the present embodiment, does not repeat them here.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. one kind is reduced the method that uplink reference symbol disturbs, and it is characterized in that this method may further comprise the steps:
A, user equipment (UE) determine whether to send uplink reference symbol in preset time slot according to current path loss difference and preset threshold value;
The base station in service sector of b, described UE is according to the current described path loss difference that reports of described UE and described preset threshold value, judged before receiving the path loss difference that described UE reports next time, described UE at default time slot whether to its transmission uplink reference symbol;
Wherein, when described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, described step a was:
Described UE judge current described path loss difference whether less than or be not more than described preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot;
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, described step a was:
Described UE judges whether current described path loss difference is greater than or not less than described preset threshold value, if then send uplink reference symbol in preset time slot, otherwise do not send uplink reference symbol in preset time slot.
2. method according to claim 1 is characterized in that,
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, described step b was:
The base station in service sector of described UE judge the current described path loss difference that reports of described UE whether less than or be not more than described preset threshold value, if, then judged before receiving the path loss difference that described UE reports next time, described UE will send uplink reference symbol to it at default time slot, otherwise, judgement is before receiving the path loss difference that described UE reports next time, and described UE does not send uplink reference symbol to it at default time slot.
3. method according to claim 1 is characterized in that,
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, described step b was:
The base station in service sector of described UE judges whether the current described path loss difference that reports of described UE is greater than or not less than described preset threshold value, if, then judged before receiving the path loss difference that described UE reports next time, described UE will send uplink reference symbol to it at default time slot, otherwise, judgement is before receiving the path loss difference that described UE reports next time, and described UE will not send uplink reference symbol to it at default time slot.
4. according to the described arbitrary method of claim 1 to 3, it is characterized in that, further comprise before the described step a:
X, system set up the mapping table of the transmitting power of path loss difference and uplink reference symbol in advance, and default in described UE and the described base station in service sector, described path loss difference is the path loss difference of adjacent cell base station and base station in service sector or the path loss difference of base station in service sector and adjacent cell base station;
When described path loss difference was the path loss difference of adjacent cell base station and base station in service sector, path loss difference was more big described in this mapping table, and corresponding transmitting power is more big;
When described path loss difference was the path loss difference of base station in service sector and adjacent cell base station, path loss difference was more big described in this mapping table, and corresponding transmitting power is more little;
Further comprise between described step a and the b:
Y, determine when default time slot sends uplink reference symbol, according to described mapping table and current described path loss difference, to determine the transmitting power of described uplink reference symbol as described UE.
5. according to the described arbitrary method of claim 1 to 3, it is characterized in that,
Further comprise before the described step a:
System sets up the mapping table of the transmitting power of ascending load indication parameter and uplink reference symbol in advance, and defaults in described UE and the base station, and the transmitting power of the more little then correspondence of ascending load indication parameter is more big in the described mapping table; Described ascending load indication parameter is noise rise RoT parameter or Interference Signal Code Power ISCP parameter;
Further comprise between described step a and the b:
Y, determine when default time slot sends uplink reference symbol, according to described mapping table and the current described ascending load indication parameter that issues of adjacent cell base station, to determine the transmitting power of described uplink reference symbol as described UE.
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