CN103052102A - Terminal, base station, channel measuring method, pilot frequency pattern setting system and method - Google Patents
Terminal, base station, channel measuring method, pilot frequency pattern setting system and method Download PDFInfo
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- CN103052102A CN103052102A CN2013100209633A CN201310020963A CN103052102A CN 103052102 A CN103052102 A CN 103052102A CN 2013100209633 A CN2013100209633 A CN 2013100209633A CN 201310020963 A CN201310020963 A CN 201310020963A CN 103052102 A CN103052102 A CN 103052102A
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Abstract
The invention provides a base station comprising a pilot frequency selecting unit and a control unit, wherein the pilot frequency selecting unit is used for receiving a relative movement speed of at least one terminal and the base station, which is reported by the at least one terminal in a cell covered by the base station, calculating a relative movement speed threshold value according to the relative movement speed and a pre-set performance loss rate, calculating coherence time corresponding to the relative movement speed threshold value according to the relative movement speed threshold value, and setting public pilot frequency patterns according to the coherence time; and the control unit is used for transmitting the public pilot frequency patterns to the terminal to measure channel information by the terminal according to the public pilot frequency patterns. The invention further provides a terminal, a pilot frequency pattern setting system, a channel measuring method and a pilot frequency pattern setting method. With the adoption of the technical scheme, the expending of public pilot frequency can be effectively reduced under the precondition of guaranteeing the performance of the system.
Description
Technical field
The present invention relates to the mobile communication technology field, in particular to a kind of terminal, a kind of base station, a kind of pilot frequency design system, a kind of channel measuring method and a kind of pilot frequency design method to set up are set.
Background technology
According to the demand (3GPP, TR25.913) of operator, 3GPP LTE agreement need to support speed up to 350 kms/hour portable terminal.Have larger Doppler frequency shift between the terminal of high-speed mobile and the base station, in order to guarantee certain channel estimating performance, system is used for reference symbol time interval of channel measurement should be less than coherence time corresponding to Doppler frequency shift.In 3GPP LTE Protocol Design, system comes the design reference symbol according to maximum support terminal speed (350 kms/hour), namely all adopts identical reference symbol form (3GPP TS36.211) for any residential quarter.
Adopting the mobile communication in the vehicles such as LTE technical support high-speed railway, aircraft, bus is the focus of sector application.These delivery vehicles are with different speed operations, simultaneously inner user moving speed lower (substantially static).At this moment, vehicle interior forms the residential quarter of a group mobility, is contacted by wireless backhaul links and control base station by delivery vehicle.In this residential quarter, the translational speed of terminal is lower, adopts same reference symbol design obviously to there is no need with common residential quarter, also can cause waste to carrier resource.
In the prior art, exist a kind of scheme to select the public guide frequency pattern according to the average speed of terminal, but in this case, be higher than channel coherence time of portable terminal of average speed less than time interval of two adjacent public guide frequencies, can't make accurately channel estimating according to the public guide frequency measurement result.
Therefore, need a kind of new pilot frequency design that technology is set, can under the prerequisite that guarantees systematic function, effectively reduce the expense of public guide frequency.
Summary of the invention
The present invention just is being based on the problems referred to above, has proposed a kind of pilot frequency design technology is set, and can under the prerequisite that guarantees systematic function, effectively reduce the expense of public guide frequency.
In view of this, the present invention proposes a kind of terminal, be in the residential quarter that the base station covers, comprising: the tachometric survey unit is used for measuring the relative moving speed of described terminal and described base station, and described relative moving speed is reported described base station; The pilot measurement unit is used for receiving the public guide frequency pattern that described base station arranges according to described relative moving speed, and measures channel information according to described public guide frequency pattern.
In technique scheme, preferably, described relative moving speed is measured according to level crossing rate and/or Doppler frequency spectrum in described tachometric survey unit.
In technique scheme, preferably, described tachometric survey unit is according to the Preset Time interval, or when receiving the collection signal of described base station, measures described relative moving speed.
In above-mentioned arbitrary technical scheme, preferably, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
The invention allows for a kind of base station, comprise: the pilot tone selected cell, for described at least one terminal of at least one terminal to report in the residential quarter that receives the covering of described base station and the relative moving speed of described base station, calculate the relative moving speed threshold value according to described relative moving speed and default capabilities loss late, calculate the coherence time corresponding with described relative moving speed threshold value according to described relative moving speed threshold value, according to the public guide frequency pattern is set described coherence time; Control unit is used for described public guide frequency pattern is transferred to described terminal, measures channel information for described terminal according to described public guide frequency pattern.
In this technical scheme, because existing base station all is that the terminal velocity supported according to maximum is (in 3GPP LTE agreement, the maximum terminal velocity of supporting be 350 kms/hour) the public guide frequency pattern is set, and in fact, in the residential quarter that the base station covers, be not that all terminals all support speed with respect to base station movement with maximum, such as for the base station in the coffee-house, the entrained terminal of client moves with client, very little with the relative moving speed (being absolute velocity) of base station, or for the base station on the train, the entrained terminal of the passenger in the train moves with the passenger, and is also very little with the relative moving speed of base station, in these cases, according to the terminal velocity of maximum support the public guide frequency pattern is set if the base station is set, meeting is so that base station all terminal pilot signal transmitteds in the residential quarter continually cause the waste of carrier resource.
And calculate the relative moving speed threshold value by relative moving speed and default capabilities loss late according to terminal and base station, can be according to the speed of each terminal in the residential quarter, determine a public guide frequency pattern, in guaranteeing the residential quarter under the prerequisite of the performance of terminal, make the base station with suitable frequency all terminal pilot signal transmitteds in the residential quarter, the expense of greatly saving public guide frequency.
In technique scheme, preferably, described pilot tone selected cell is determined the cumulative distribution function of described relative moving speed according to described relative moving speed, calculate described relative moving speed threshold value according to described cumulative distribution function and described default capabilities loss late.
In this technical scheme, can set in advance the base station after receiving the relative moving speed of terminal, generate the curve of cumulative distribution function (being CDF) according to relative moving speed, the performance loss rate that the while basis sets in advance is (such as arranging in all terminals, there is 5% terminal can't accurately carry out channel estimating, so performance loss rate is 5%) in above-mentioned curve, can determine a relative moving speed value, i.e. relative moving speed threshold value.
In technique scheme, preferably, described pilot tone selected cell arranges described base station and sends the time interval of pilot signal and be less than or equal to described coherence time, described public guide frequency pattern is set according to the described time interval.
In this technical scheme, calculate coherence time corresponding to this translational speed threshold value according to the translational speed threshold value, larger with respect to the coherence time that obtains according to maximum support speed in the prior art such as 5ms, such as 0.1ms.Send the time interval of pilot signal and be less than or equal to this coherence time for guaranteeing the base station, therefore the base station can be set sends pilot tone one time every 5ms, with respect to sending pilot tone one time every 0.1ms in the prior art, greatly saved resource consumption, reduced the expense of public guide frequency.
In above-mentioned arbitrary technical scheme, preferably, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
The invention allows for a kind of pilot frequency design system is set, comprise: base station and be at least one terminal in the residential quarter that described base station covers, wherein, described at least one terminal comprises: the tachometric survey unit, be used for measuring the relative moving speed of described terminal and described base station, and described relative moving speed is reported described base station; The pilot measurement unit is used for receiving the public guide frequency pattern from described base station, and measures channel information according to described public guide frequency pattern; And described base station comprises: the pilot tone selected cell, be used for receiving described relative moving speed, calculate the relative moving speed threshold value according to described relative moving speed and default capabilities loss late, calculate the coherence time corresponding with described relative moving speed threshold value according to described relative moving speed threshold value, according to described public guide frequency pattern is set described coherence time; Control unit is used for described public guide frequency pattern is transferred to described terminal.
In this technical scheme, because existing base station all is that the terminal velocity supported according to maximum is (in 3GPP LTE agreement, the maximum terminal velocity of supporting be 350 kms/hour) the public guide frequency pattern is set, and in fact, in the residential quarter that the base station covers, be not that all terminals all support speed with respect to base station movement with maximum, such as for the base station in the coffee-house, the entrained terminal of client moves with client, very little with the relative moving speed (being absolute velocity) of base station, or for the base station on the train, the entrained terminal of the passenger in the train moves with the passenger, and is also very little with the relative moving speed of base station, in these cases, according to the terminal velocity of maximum support the public guide frequency pattern is set if the base station is set, meeting is so that base station all terminal pilot signal transmitteds in the residential quarter continually cause the waste of carrier resource.
And calculate the relative moving speed threshold value by relative moving speed and default capabilities loss late according to terminal and base station, can be according to the speed of each terminal in the residential quarter, determine a public guide frequency pattern, in guaranteeing the residential quarter under the prerequisite of the performance of terminal, make the base station with suitable frequency all terminal pilot signal transmitteds in the residential quarter, the expense of greatly saving public guide frequency.
In technique scheme, preferably, described relative moving speed is measured according to level crossing rate and/or Doppler frequency spectrum in described tachometric survey unit.
In technique scheme, preferably, described tachometric survey unit is according to the Preset Time interval, or when receiving the collection signal of described base station, measures described relative moving speed.
In technique scheme, preferably, described pilot tone selected cell is determined the cumulative distribution function of described relative moving speed according to described relative moving speed, calculate described relative moving speed threshold value according to described cumulative distribution function and described default capabilities loss late.
In this technical scheme, can set in advance the base station after receiving the relative moving speed of terminal, generate the curve of cumulative distribution function (being CDF) according to relative moving speed, the performance loss rate that the while basis sets in advance is (such as arranging in all terminals, there is 5% terminal can't accurately carry out channel estimating, so performance loss rate is 5%) in above-mentioned curve, can determine a relative moving speed value, i.e. relative moving speed threshold value.
In technique scheme, preferably, described pilot tone selected cell arranges described base station and sends the time interval of pilot signal and be less than or equal to described coherence time, described public guide frequency pattern is set according to the described time interval.
In this technical scheme, calculate coherence time corresponding to this translational speed threshold value according to the translational speed threshold value, larger with respect to the coherence time that obtains according to maximum support speed in the prior art such as 5ms, such as 0.1ms.Send the time interval of pilot signal and be less than or equal to this coherence time for guaranteeing the base station, therefore the base station can be set sends pilot tone one time every 5ms, with respect to sending pilot tone one time every 0.1ms in the prior art, greatly saved resource consumption, reduced the expense of public guide frequency.
In above-mentioned arbitrary technical scheme, preferably, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
The invention allows for a kind of channel measuring method, comprising: step 402 is at least one terminal described at least one terminal of measurement in the residential quarter that the base station covers and the relative moving speed of described base station, and described relative moving speed is reported described base station; Step 404, described terminal receive the public guide frequency pattern that described base station arranges according to described relative moving speed, and measure channel information according to described public guide frequency pattern.
In technique scheme, preferably, described step 402 comprises: described at least one terminal is measured described relative moving speed according to level crossing rate and/or Doppler frequency spectrum.
In technique scheme, preferably, described step 402 comprises: described terminal is according to the Preset Time interval, or when receiving the collection signal of described base station, measures described relative moving speed.
In above-mentioned arbitrary technical scheme, preferably, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
The invention allows for a kind of pilot frequency design method to set up, comprising: step 502, base station receive at least one terminal to report in the residential quarter that described base station covers, the relative moving speed of described at least one terminal and described base station; Step 504, the relative moving speed threshold value is calculated according to described relative moving speed and default capabilities loss late in described base station, calculate the coherence time corresponding with described relative moving speed threshold value according to described relative moving speed threshold value, and according to the public guide frequency pattern is set described coherence time; Step 506, described base station transfers to described terminal with described public guide frequency pattern, measures channel information for described terminal according to described public guide frequency pattern.
In this technical scheme, because existing base station all is that the terminal velocity supported according to maximum is (in 3GPP LTE agreement, the maximum terminal velocity of supporting be 350 kms/hour) the public guide frequency pattern is set, and in fact, in the residential quarter that the base station covers, be not that all terminals all support speed with respect to base station movement with maximum, such as for the base station in the coffee-house, the entrained terminal of client moves with client, very little with the relative moving speed (being absolute velocity) of base station, or for the base station on the train, the entrained terminal of the passenger in the train moves with the passenger, and is also very little with the relative moving speed of base station, in these cases, according to the terminal velocity of maximum support the public guide frequency pattern is set if the base station is set, meeting is so that base station all terminal pilot signal transmitteds in the residential quarter continually cause the waste of carrier resource.
And calculate the relative moving speed threshold value by relative moving speed and default capabilities loss late according to terminal and base station, can be according to the speed of each terminal in the residential quarter, determine a public guide frequency pattern, in guaranteeing the residential quarter under the prerequisite of the performance of terminal, make the base station with suitable frequency all terminal pilot signal transmitteds in the residential quarter, the expense of greatly saving public guide frequency.
In technique scheme, preferably, described step 504 comprises: the cumulative distribution function of described relative moving speed is determined in described base station according to described relative moving speed, calculates described relative moving speed threshold value according to described cumulative distribution function and described default capabilities loss late.
In this technical scheme, can set in advance the base station after receiving the relative moving speed of terminal, generate the curve of cumulative distribution function (being CDF) according to relative moving speed, the performance loss rate that the while basis sets in advance is (such as arranging in all terminals, there is 5% terminal can't accurately carry out channel estimating, so performance loss rate is 5%) in above-mentioned curve, can determine a relative moving speed value, i.e. relative moving speed threshold value.
In technique scheme, preferably, described step 504 comprises: described base station arranges described base station and sends the time interval of pilot signal and be less than or equal to described coherence time, described public guide frequency pattern is set according to the described time interval.
In this technical scheme, calculate coherence time corresponding to this translational speed threshold value according to the translational speed threshold value, larger with respect to the coherence time that obtains according to maximum support speed in the prior art such as 5ms, such as 0.1ms.Send the time interval of pilot signal and be less than or equal to this coherence time for guaranteeing the base station, therefore the base station can be set sends pilot tone one time every 5ms, with respect to sending pilot tone one time every 0.1ms in the prior art, greatly saved resource consumption, reduced the expense of public guide frequency.
In above-mentioned arbitrary technical scheme, preferably, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
By above technical scheme, can under the prerequisite that guarantees systematic function, effectively reduce the expense of public guide frequency.
Description of drawings
Fig. 1 shows the according to an embodiment of the invention block diagram of terminal;
Fig. 2 shows the according to an embodiment of the invention block diagram of base station;
Fig. 3 shows the block diagram that pilot frequency design according to an embodiment of the invention arranges system;
Fig. 4 shows the according to an embodiment of the invention flow chart of channel measuring method;
Fig. 5 shows the according to an embodiment of the invention flow chart of pilot frequency design method to set up;
Fig. 6 shows the according to an embodiment of the invention particular flow sheet of pilot frequency design method to set up;
Fig. 7 shows pilot frequency design according to an embodiment of the invention the schematic diagram of transfer of data between the base station and terminal is set in the system.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments the present invention is further described in detail.Need to prove, in the situation that do not conflict, the application's embodiment and the feature among the embodiment can make up mutually.
A lot of details have been set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subjected to the restriction of following public specific embodiment.
Fig. 1 shows the according to an embodiment of the invention block diagram of terminal.
As shown in Figure 1, terminal 100 according to an embodiment of the invention, are in the residential quarter of base station covering, comprising: tachometric survey unit 102, and for the relative moving speed of measuring terminals 100 with the base station, and with the relative moving speed reporting base station; Pilot measurement unit 104 is used for receiving the public guide frequency pattern that the base station arranges according to relative moving speed, and measures channel information according to the public guide frequency pattern.
Preferably, relative moving speed is measured according to level crossing rate and/or Doppler frequency spectrum in tachometric survey unit 102.
Preferably, tachometric survey unit 102 is according to the Preset Time interval, or when receiving the collection signal of base station, measures relative moving speed.
Terminal 100 can be set measure at regular intervals relative moving speed with the base station, and with the data reporting base station that records, 100 at terminal also can be set when the signal that receives the base station or instruction, measure again relative moving speed with the base station, be convenient to the user and arrange as required.
Preferably, the residential quarter of base station covering is by wireless backhaul links and base station communication.
Fig. 2 shows the according to an embodiment of the invention block diagram of base station.
As shown in Figure 2, base station 200 comprises according to an embodiment of the invention: pilot tone selected cell 202, for at least one terminal of at least one terminal to report in the residential quarter that receives base station 200 coverings and the relative moving speed of base station, calculate the relative moving speed threshold value according to relative moving speed and default capabilities loss late, calculate the coherence time corresponding with the relative moving speed threshold value according to the relative moving speed threshold value, according to the public guide frequency pattern is set coherence time; Control unit 204 is used for the public guide frequency pattern is transferred to terminal, measures channel information for terminal according to the public guide frequency pattern.
Because existing base station all is that the terminal velocity supported according to maximum is (in 3GPP LTE agreement, the maximum terminal velocity of supporting be 350 kms/hour) the public guide frequency pattern is set, and in fact, in the residential quarter that base station 200 covers, be not that all terminals all support that with maximum speed moves with respect to base station 200, such as for the base station 200 in the coffee-house, the entrained terminal of client moves with client, very little with the relative moving speed (being absolute velocity) of base station 200, or for the base station 200 on the train, the entrained terminal of passenger in the train moves with the passenger, also very little with the relative moving speed of base station 200, in these cases, if being set, base station 200 according to the terminal velocity of maximum support the public guide frequency pattern is set, meeting is so that base station 200 all terminal pilot signal transmitteds in the residential quarter continually cause the waste of carrier resource.
And calculate the relative moving speed threshold value by relative moving speed and default capabilities loss late according to terminal and base station 200, can be according to the speed of each terminal in the residential quarter, determine a public guide frequency pattern, in guaranteeing the residential quarter under the prerequisite of the performance of terminal, make base station 200 with suitable frequency all terminal pilot signal transmitteds in the residential quarter, the expense of greatly saving public guide frequency.
Preferably, pilot tone selected cell 202 is determined the cumulative distribution function of relative moving speed according to relative moving speed, calculates the relative moving speed threshold value according to cumulative distribution function and default capabilities loss late.
Can set in advance base station 200 after receiving the relative moving speed of terminal, generate the curve of cumulative distribution function (being CDF) according to relative moving speed, the performance loss rate that the while basis sets in advance is (such as arranging in all terminals, there is 5% terminal can't accurately carry out channel estimating, so performance loss rate is 5%) in above-mentioned curve, can determine a relative moving speed value, i.e. relative moving speed threshold value.
Preferably, pilot tone selected cell 202 arranges base station 200 and sends the time interval of pilot signal and be less than or equal to coherence time, the public guide frequency pattern is set according to the time interval.
Calculate coherence time corresponding to this translational speed threshold value according to the translational speed threshold value, larger with respect to the coherence time that obtains according to maximum support speed in the prior art such as 5ms, such as 0.1ms.The time interval of sending pilot signal for assurance base station 200 is less than or equal to this coherence time, therefore base station 200 can be set sends pilot tone one time every 5ms, with respect to sending pilot tone one time every 0.1ms in the prior art, greatly saved resource consumption, reduced the expense of public guide frequency.
Preferably, communicate by letter with base station 200 by wireless backhaul links in the residential quarter of base station 200 coverings.
Fig. 3 shows the block diagram that pilot frequency design according to an embodiment of the invention arranges system.
As shown in Figure 3, pilot frequency design arranges system 300 and comprises according to an embodiment of the invention: base station 200 and be at least one terminal 100 in the residential quarter that base station 200 covers, wherein, at least one terminal 100 comprises: tachometric survey unit 102, the relative moving speed that is used for measuring terminals 100 and base station 200, and with relative moving speed reporting base station 200; Pilot measurement unit 104 is used for receiving the public guide frequency pattern from base station 200, and measures channel information according to the public guide frequency pattern; And base station 200 comprises: pilot tone selected cell 202, be used for receiving relative moving speed, calculate the relative moving speed threshold value according to relative moving speed and default capabilities loss late, calculate the coherence time corresponding with the relative moving speed threshold value according to the relative moving speed threshold value, according to the public guide frequency pattern is set coherence time; Control unit 204 is used for the public guide frequency pattern is transferred to terminal 100.
Because existing base station all is that the terminal velocity supported according to maximum is (in 3GPP LTE agreement, the maximum terminal velocity of supporting be 350 kms/hour) the public guide frequency pattern is set, and in fact, in the residential quarter that base station 200 covers, be not that all terminals 100 all support that with maximum speed moves with respect to base station 200, such as for the base station 200 in the coffee-house, the entrained terminal of client 100 moves with client, very little with the relative moving speed (being absolute velocity) of base station 200, or for the base station 200 on the train, the entrained terminal of passenger in the train 100 moves with the passenger, also very little with the relative moving speed of base station 200, in these cases, if being set, base station 200 according to the terminal velocity of maximum support the public guide frequency pattern is set, meeting is so that base station 200 all terminal 100 pilot signal transmitteds in the residential quarter continually cause the waste of carrier resource.
And by calculating the relative moving speed threshold value according to terminal 100 and relative moving speed and the default capabilities loss late of base station 200, can be according to the speed of each terminal 100 in the residential quarter, determine a public guide frequency pattern, in guaranteeing the residential quarter under the prerequisite of the performance of terminal 100, make base station 200 with suitable frequency all terminal 100 pilot signal transmitteds in the residential quarter, the expense of greatly saving public guide frequency.
Preferably, relative moving speed is measured according to level crossing rate and/or Doppler frequency spectrum in tachometric survey unit 102.
Preferably, tachometric survey unit 102 is according to the Preset Time interval, or when receiving the collection signal of base station 200, measures relative moving speed.
Terminal 100 can be set measure at regular intervals relative moving speed with base station 200, and with the data reporting base station 200 that records, 100 at terminal also can be set when the signal that receives base station 200 or instruction, measure again relative moving speed with base station 200, be convenient to the user and arrange as required.
Preferably, pilot tone selected cell 202 is determined the cumulative distribution function of relative moving speed according to relative moving speed, calculates the relative moving speed threshold value according to cumulative distribution function and default capabilities loss late.
Can set in advance base station 200 behind the relative moving speed that receives terminal 100, generate the curve of cumulative distribution function (being CDF) according to relative moving speed, the performance loss rate that the while basis sets in advance is (such as arranging in all terminals 100, there is 5% terminal 100 can't accurately carry out channel estimating, so performance loss rate is 5%) in above-mentioned curve, can determine a relative moving speed value, i.e. relative moving speed threshold value.
Preferably, pilot tone selected cell 202 arranges base station 200 and sends the time interval of pilot signal and be less than or equal to coherence time, the public guide frequency pattern is set according to the time interval.
Calculate coherence time corresponding to this translational speed threshold value according to the translational speed threshold value, larger with respect to the coherence time that obtains according to maximum support speed in the prior art such as 5ms, such as 0.1ms.The time interval of sending pilot signal for assurance base station 200 is less than or equal to this coherence time, therefore base station 200 can be set sends pilot tone one time every 5ms, with respect to sending pilot tone one time every 0.1ms in the prior art, greatly saved resource consumption, reduced the expense of public guide frequency.
Preferably, communicate by letter with base station 200 by wireless backhaul links in the residential quarter of base station 200 coverings.
Fig. 4 shows the according to an embodiment of the invention flow chart of channel measuring method.
As shown in Figure 4, channel measuring method comprises according to an embodiment of the invention: step 402, be in the relative moving speed that at least one terminal in the residential quarter that the base station covers is measured at least one terminal and base station, and with the relative moving speed reporting base station; Step 404, terminal receives the public guide frequency pattern that the base station arranges according to relative moving speed, and measures channel information according to the public guide frequency pattern.
Preferably, step 402 comprises: at least one terminal is measured relative moving speed according to level crossing rate and/or Doppler frequency spectrum.
Preferably, step 402 comprises: terminal is according to the Preset Time interval, or when receiving the collection signal of base station, measures relative moving speed.
Terminal can be set measure at regular intervals relative moving speed with the base station, and with the data reporting base station that records, terminal also can be set only when the signal that receives the base station or instruction, measure again relative moving speed with the base station, be convenient to the user and arrange as required.
Preferably, the residential quarter of base station covering is by wireless backhaul links and base station communication.
Fig. 5 shows the according to an embodiment of the invention flow chart of pilot frequency design method to set up.
As shown in Figure 5, the pilot frequency design method to set up comprises according to an embodiment of the invention: step 502, at least one terminal of at least one terminal to report in the residential quarter that reception base station, base station covers and the relative moving speed of base station; Step 504, the relative moving speed threshold value is calculated according to relative moving speed and default capabilities loss late in the base station, calculate the coherence time corresponding with the relative moving speed threshold value according to the relative moving speed threshold value, and according to the public guide frequency pattern is set coherence time; Step 506, the base station transfers to terminal with the public guide frequency pattern, measures channel information for terminal according to the public guide frequency pattern.
Because existing base station all is that the terminal velocity supported according to maximum is (in 3GPP LTE agreement, the maximum terminal velocity of supporting be 350 kms/hour) the public guide frequency pattern is set, and in fact, in the residential quarter that the base station covers, be not that all terminals all support speed with respect to base station movement with maximum, such as for the base station in the coffee-house, the entrained terminal of client moves with client, very little with the relative moving speed (being absolute velocity) of base station, or for the base station on the train, the entrained terminal of passenger in the train moves with the passenger, also very little with the relative moving speed of base station, in these cases, if being set, the base station according to the terminal velocity of maximum support the public guide frequency pattern is set, meeting is so that base station all terminal pilot signal transmitteds in the residential quarter continually cause the waste of carrier resource.
And calculate the relative moving speed threshold value by relative moving speed and default capabilities loss late according to terminal and base station, can be according to the speed of each terminal in the residential quarter, determine a public guide frequency pattern, in guaranteeing the residential quarter under the prerequisite of the performance of terminal, make the base station with suitable frequency all terminal pilot signal transmitteds in the residential quarter, the expense of greatly saving public guide frequency.
Preferably, step 504 comprises: the cumulative distribution function of relative moving speed is determined in the base station according to relative moving speed, calculates the relative moving speed threshold value according to cumulative distribution function and default capabilities loss late.
Can set in advance the base station after receiving the relative moving speed of terminal, generate the curve of cumulative distribution function (being CDF) according to relative moving speed, the performance loss rate that the while basis sets in advance is (such as arranging in all terminals, there is 5% terminal can't accurately carry out channel estimating, so performance loss rate is 5%) in above-mentioned curve, can determine a relative moving speed value, i.e. relative moving speed threshold value.
Preferably, step 504 comprises: the base station arranges the base station and sends the time interval of pilot signal and be less than or equal to coherence time, the public guide frequency pattern is set according to the time interval.
Calculate coherence time corresponding to this translational speed threshold value according to the translational speed threshold value, larger with respect to the coherence time that obtains according to maximum support speed in the prior art such as 5ms, such as 0.1ms.Send the time interval of pilot signal and be less than or equal to this coherence time for guaranteeing the base station, therefore the base station can be set sends pilot tone one time every 5ms, with respect to sending pilot tone one time every 0.1ms in the prior art, greatly saved resource consumption, reduced the expense of public guide frequency.
Preferably, the residential quarter of base station covering is by wireless backhaul links and base station communication.
Fig. 6 shows the according to an embodiment of the invention particular flow sheet of pilot frequency design method to set up.
As shown in Figure 6, specifically comprising of pilot frequency design method to set up according to an embodiment of the invention:
Step 602 is in the one or more terminals in the base station service area, and the relative moving speed of self and base station is measured at interval or when receiving the collection signal of base station to schedule, and with the transfer of data that records to the base station;
Particularly, can be sent by base station all terminals in the service area and collect signals, obtain all each relative moving speeds that record, then obtain relative moving speed and determine cumulative distribution function curve (being CDF), the base station is according to predefined rule (CDF5% for example, in all terminals, have 5% terminal can't make exactly channel estimating) obtain corresponding relative moving speed threshold value V
T, the base station is according to V
TObtain corresponding T coherence time
T, and according to T coherence time
TThe corresponding time interval (being the pattern of common reference symbol) of setting common reference symbol, and notification terminal.
Fig. 7 shows pilot frequency design according to an embodiment of the invention the schematic diagram of transfer of data between the base station and terminal is set in the system.
As shown in Figure 7, the terminal 100 in 200 service areas of base station is interval or when receiving the collection signal of base station 200 to schedule, and the relative moving speed of self and base station 200 is measured in tachometric survey unit 102, and with the transfer of data that records to the base station 200.Pilot tone selected cell 202 bases receive relative moving speed and preset algorithm obtains the relative moving speed threshold value, and determine corresponding coherence time according to the relative moving speed threshold value, then according to selecting the public guide frequency pattern coherence time, the public guide frequency pattern that control unit 204 is selected pilot tone selected cell 202 transfers to terminal 100, and channel information is measured according to the public guide frequency pattern that receives in pilot measurement unit 104.
Need to prove, transfer of data can be carried out with a plurality of terminals 100 simultaneously in base station 200, and according to determining the public guide frequency pattern from the data of each terminal 100.
More than be described with reference to the accompanying drawings technical scheme of the present invention, considered in the correlation technique, for the terminal in the residential quarter, adopted same reference symbol design with common residential quarter, extremely wasted carrier resource.By technical scheme of the present invention, can under the prerequisite that guarantees systematic function, effectively reduce the expense of public guide frequency.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.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 (22)
1. a terminal is characterized in that, is in the residential quarter of base station covering, comprising:
The tachometric survey unit is used for measuring the relative moving speed of described terminal and described base station, and described relative moving speed is reported described base station;
The pilot measurement unit is used for receiving the public guide frequency pattern that described base station arranges according to described relative moving speed, and measures channel information according to described public guide frequency pattern.
2. terminal according to claim 1 is characterized in that, described relative moving speed is measured according to level crossing rate and/or Doppler frequency spectrum in described tachometric survey unit.
3. terminal according to claim 1 is characterized in that, described tachometric survey unit is according to the Preset Time interval, or when receiving the collection signal of described base station, measures described relative moving speed.
4. each described terminal in 3 according to claim 1 is characterized in that, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
5. a base station is characterized in that, comprising:
The pilot tone selected cell, for described at least one terminal of at least one terminal to report in the residential quarter that receives the covering of described base station and the relative moving speed of described base station, calculate the relative moving speed threshold value according to described relative moving speed and default capabilities loss late, calculate the coherence time corresponding with described relative moving speed threshold value according to described relative moving speed threshold value, according to the public guide frequency pattern is set described coherence time;
Control unit is used for described public guide frequency pattern is transferred to described terminal, measures channel information for described terminal according to described public guide frequency pattern.
6. base station according to claim 5, it is characterized in that, described pilot tone selected cell is determined the cumulative distribution function of described relative moving speed according to described relative moving speed, calculate described relative moving speed threshold value according to described cumulative distribution function and described default capabilities loss late.
7. base station according to claim 5 is characterized in that, described pilot tone selected cell arranges described base station and sends the time interval of pilot signal and be less than or equal to described coherence time, described public guide frequency pattern is set according to the described time interval.
8. each described base station in 7 according to claim 5 is characterized in that, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
9. a pilot frequency design arranges system, it is characterized in that, comprising: base station and be at least one terminal in the residential quarter that described base station covers, and wherein, described at least one terminal comprises:
The tachometric survey unit is used for measuring the relative moving speed of described terminal and described base station, and described relative moving speed is reported described base station;
The pilot measurement unit is used for receiving the public guide frequency pattern from described base station, and measures channel information according to described public guide frequency pattern; And
Described base station comprises:
The pilot tone selected cell, be used for receiving described relative moving speed, calculate the relative moving speed threshold value according to described relative moving speed and default capabilities loss late, calculate the coherence time corresponding with described relative moving speed threshold value according to described relative moving speed threshold value, according to described public guide frequency pattern is set described coherence time;
Control unit is used for described public guide frequency pattern is transferred to described terminal.
10. pilot frequency design according to claim 9 arranges system, it is characterized in that, described relative moving speed is measured according to level crossing rate and/or Doppler frequency spectrum in described tachometric survey unit.
11. pilot frequency design according to claim 9 arranges system, it is characterized in that, described tachometric survey unit is according to the Preset Time interval, or when receiving the collection signal of described base station, measures described relative moving speed.
12. pilot frequency design according to claim 9 arranges system, it is characterized in that, described pilot tone selected cell is determined the cumulative distribution function of described relative moving speed according to described relative moving speed, calculate described relative moving speed threshold value according to described cumulative distribution function and described default capabilities loss late.
13. pilot frequency design according to claim 9 arranges system, it is characterized in that, described pilot tone selected cell arranges described base station and sends the time interval of pilot signal and be less than or equal to described coherence time, described public guide frequency pattern is set according to the described time interval.
14. each described pilot frequency design arranges system in 13 according to claim 9, it is characterized in that, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
15. a channel measuring method is characterized in that, comprising:
Step 402 is at least one terminal described at least one terminal of measurement in the residential quarter that the base station covers and the relative moving speed of described base station, and described relative moving speed is reported described base station;
Step 404, described terminal receive the public guide frequency pattern that described base station arranges according to described relative moving speed, and measure channel information according to described public guide frequency pattern.
16. channel measuring method according to claim 15 is characterized in that, described step 402 comprises: described at least one terminal is measured described relative moving speed according to level crossing rate and/or Doppler frequency spectrum.
17. channel measuring method according to claim 15 is characterized in that, described step 402 comprises: described terminal is according to the Preset Time interval, or when receiving the collection signal of described base station, measures described relative moving speed.
18. each described channel measuring method in 17 is characterized in that according to claim 15, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
19. a pilot frequency design method to set up is characterized in that, comprising:
Step 502, base station receive at least one terminal to report in the residential quarter that described base station covers, the relative moving speed of described at least one terminal and described base station;
Step 504, the relative moving speed threshold value is calculated according to described relative moving speed and default capabilities loss late in described base station, calculate the coherence time corresponding with described relative moving speed threshold value according to described relative moving speed threshold value, and according to the public guide frequency pattern is set described coherence time;
Step 506, described base station transfers to described terminal with described public guide frequency pattern, measures channel information for described terminal according to described public guide frequency pattern.
20. pilot frequency design method to set up according to claim 19, it is characterized in that, described step 504 comprises: the cumulative distribution function of described relative moving speed is determined in described base station according to described relative moving speed, calculates described relative moving speed threshold value according to described cumulative distribution function and described default capabilities loss late.
21. pilot frequency design method to set up according to claim 19, it is characterized in that, described step 504 comprises: described base station arranges described base station and sends the time interval of pilot signal and be less than or equal to described coherence time, described public guide frequency pattern is set according to the described time interval.
22. each described pilot frequency design method to set up in 21 is characterized in that according to claim 19, the residential quarter that described base station covers is by wireless backhaul links and described base station communication.
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