CN102573069B - Distribution method of sounding sequence and base station - Google Patents

Distribution method of sounding sequence and base station Download PDF

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CN102573069B
CN102573069B CN201010576354.2A CN201010576354A CN102573069B CN 102573069 B CN102573069 B CN 102573069B CN 201010576354 A CN201010576354 A CN 201010576354A CN 102573069 B CN102573069 B CN 102573069B
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terminal
base station
type
distance
detection sequence
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CN102573069A (en
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刘敏
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

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Abstract

The invention provides a distribution method of a sounding sequence and a base station. The method comprises the following steps that: a base station estimates a distance between a terminal and the base station according to a channel condition feedbacked by the terminal; the base station determines the type of the terminal based on the estimated distance, wherein the type of the terminal at least includes: a near-point terminal type and a far-point terminal type; and the base station distributes a sounding sequence for the terminal according to the type of the terminal. According to the invention, an interference at an uplink sounding zone can be reduced. Meanwhile, the demodulation demand of a base station side can be met; the gain of downlink forming can be obtained; and it can be guaranteed that downlink beam forming is carried out successfully.

Description

The distribution method of detection sequence and base station
Technical field
The present invention relates to the communications field, survey distribution method and the base station of (Sounding) sequence in particular to one.
Background technology
OFDM access (Orthogonal Frequency Division Multiple Access, OFDMA) be a kind of special Multicarrier Transmission Technology, it transmits data flow at a high speed by going here and there, become and also changing to be assigned in several subchannels, improve significantly spectrum efficiency, effectively anti-multipath is disturbed and arrowband interference, become one of core technology of next generation mobile communication system.WIMAX, i.e. worldwide interoperability for microwave access, adopting OFDMA technology is WIMAX802.16e standard its physics core technology and that take into account mobility and broadband characteristics, becomes the strong competitor of next generation mobile communication standard.
Wave beam forming (Beam-Forming, BF) be that one is applied to closely spaced aerial array multi-antenna transmitting transferring technology, its cardinal principle is to utilize the strong correlation of space channel and the principle of interference of ripple to produce the antenna pattern of highly directive, make the main lobe of antenna pattern point to adaptively arrival bearing user, thereby raising signal to noise ratio, improves power system capacity or coverage.
Although the directional diagram of array antenna is omnidirectional, the output of array, after weighted sum, but can make the directive gain of array received assemble in one direction, is equivalent to form a wave beam.The process that this handle is weighted processing merging from the signal of different array elements is exactly that wave beam forms.The first schematic diagram that produces wave beam of even linear linear array as shown in Figure 1, its Mathematical Modeling can be described below:
The data of supposing input are s 1... s n, weights are w 1... w nsystem, it is output as: , here, T is transposition, w=[w 1... w n] t, s (t)=[s 1... s n] t.
Why antenna is called " smart antenna ", is the weight vectors w of antenna array 1... w ndirectional diagram that can control antenna battle array, beam shaping Base-Band Processing schematic diagram as shown in Figure 2, carries out beam shaping after data channel coding in data source, modulation, then through OFDM modulation treatment, forms the different wave beams that point to.Weight factor can be carried out optimization adjustment according to adaptive algorithm, so that current transmission environment is mated.
Wave beam forming is directly based upon on the basis of channel parameter, for up link (UL, Up Link), owing to can obtaining reliable channel in real time or cycle estimation, therefore can adopt the empty time domain parameter of channel to carry out wave beam forming, to improve uplink performance.For down link (DL, Down Link), because condition restriction is difficult to realize for the reliable of channel and estimating in real time at down link.For the system of tdd mode, under the very little condition of up-downgoing channel spacing time slot, can be similar to and think that channel does not change, thereby can use at down link the estimated value of the empty time domain parameter of the channel that obtained by upstream data, even can directly use the data of uplink beam figuration.Because uplink and downlink under tdd mode share identical band resource, therefore can carry out down channel estimation by up Sounding sequence.
Sounding sequence is a kind of Channel Detection mechanism, according to describing in 802.16e agreement, BS (Base Station, base station) require some MS (Mobile Subscriber, mobile subscriber) in the specific frequency range of up channel, send sounding waveform, BS receives after this waveform, judges the channel impulse response of the down channel of estimating BS-to-MS according to waveform.BS measures up channel response by sounding, and result is converted into the response of the down channel that will estimate, need to carry out suitable check and correction at the hardware of transmitting-receiving two-end.The Sounding sequence of describing in agreement can be divided into two kinds, type A and type B.Both differences are in the method for salary distribution of the subcarrier to sounding Zone (region).Type A is divided into the subcarrier in Sounding Zone the wave band (band) of non-overlapping copies, and each band comprises 18 continuous subcarriers.Then specify MS to send sounding waveform on the wave band of specifying.Type B is according to common sub-carrier distribution manner---and take subchannel as allocation unit, specify MS to send on definite subchannel and symbol.Whether base station and terminal support Type A Sounding or Type B Sounding, by (the System Broadcast Channel of SBC in terminal access procedure, system broadcast channel) capability negotiation, CSIT capability (ability) is obtained to the result of common factor.
TYPE category-A type is divided into Cyclic (cyclic shift) and two kinds of sequence modes of Decim ation (a carrier wave numerical value extracts), for CSIT capability A, if the separability type (separability type) during ULSounding Command is IE (uplink detection command cell) is 0, represent that Sounding sequence is Cyclic mode, terminal adopts the mode of cyclic shift to distinguish on the frequency band of Sounding region allocation.Separability type is 1, represents Sounding sequence D ecimation mode, represents that terminal sends Sounding sequence and distinguishes by bits of offset.
Beam shaping BF technology is the multi-antenna technology that carries out downlink wave beam excipient by uplink channel estimation, therefore needs to rely on up resource and channel condition and just can carry out beam shaping.Up channel estimating is called weights and estimates, Sounding sequence is that a kind of up weights of key are estimated mode, the detection of Sounding sequence is conciliate straightening and is connect the gain that has influence on descending excipient, and Sounding sequence is the information that process is not encoded, cannot restore once information is interfered, and then affect downlink wave beam excipient process.
Summary of the invention
Main purpose of the present invention is to provide a kind of distribution method and base station of detection sequence, to reduce the interference problem in above-mentioned up Sounding region.
According to an aspect of the present invention, provide a kind of distribution method of detection sequence, the method comprises: the distance of terminal and base station is estimated in base station according to the channel condition of terminal feedback; The type of terminal is determined in this base station according to the distance of estimating, the type of this terminal at least comprises: near point terminal and far point terminal; This base station is terminal distribution detection sequence according to the type of terminal.
According to a further aspect in the invention, provide a kind of base station, having comprised: apart from acquisition module, for estimate the distance of terminal and base station according to the channel condition of terminal feedback; Type determination module, according to the type of determining terminal apart from the distance of acquisition module estimation, the type of terminal at least comprises: near point terminal and far point terminal; Detection sequence distribution module, for being terminal distribution detection sequence according to the type of the definite terminal of type determination module.
By the present invention, carry out detection sequence distribution according to the distance of terminal and base station, reduce the interference in up Sounding region, can meet again the demodulation of base station side simultaneously, the gain of obtaining descending excipient, has ensured carrying out smoothly of downlink wave beam excipient.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the first schematic diagram that produces wave beam of the even linear linear array of correlation technique;
Fig. 2 is the beam shaping Base-Band Processing schematic diagram according to correlation technique;
Fig. 3 is according to the flow chart of the distribution method of the detection sequence of the embodiment of the present invention 1;
Fig. 4 is according to the flow chart of the distribution method of terminal initial when access detection sequence of the embodiment of the present invention 2;
Fig. 5 is according to the flow chart of the distribution method of detection sequence after the terminal access of the embodiment of the present invention 2;
Fig. 6 is according to the structured flowchart of the base station of the embodiment of the present invention 3.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.
The embodiment of the present invention considers that existing terminal do not support the independent power control in Sounding region, reduces the interference in Sounding region in whole net by Sounding sequence allocation, can meet again the demodulation of base station side simultaneously, obtains descending excipient gain.
Embodiment 1
Fig. 3 shows the flow chart of the distribution method of the detection sequence (Sounding sequence) according to the embodiment of the present invention, and the method comprises the following steps:
Step S302, the distance of terminal and base station is estimated in base station according to the channel condition of terminal feedback;
For example, terminal initial access network, the distance of terminal and base station is measured in base station according to the received signal strength indicator of terminal feedback (RSSI, Received Signal Strength Indication).The signal power of RSSI can be for the distance of measured signal point and acceptance point, then can position calculating according to corresponding data.The RSSI of the present embodiment terminal feedback can represent with DLRSSI, i.e. down receiving signal intensity.
Step S304, the above-mentioned distance that this base station obtains according to estimation is determined the type of above-mentioned terminal, in the present embodiment, the type of terminal at least comprises: near point terminal and far point terminal;
When specific implementation, can in base station, set a fixing value as the first set point, if the distance of estimating is greater than the first set point, base station determines that terminal is near point terminal; If the distance of estimating is less than or equal to the first set point, base station determines that terminal is far point terminal.
Preferably, in order to reach more preferably noise reduction object, can, according to the distance distance of terminal and base station, the type of terminal be divided three classes, i.e. near point terminal, far point terminal and middle point terminal; Meanwhile, on base station, set two values, be respectively, the first set point and the second set point, based on this, base station determines that according to the distance of estimating the type of terminal comprises:
If the distance of estimating is greater than the first set point, base station determines that terminal is near point terminal;
If the distance of estimating is less than the second set point, base station determines that terminal is far point terminal;
If the distance of estimating is less than or equal to the first set point, and apart from being more than or equal to the second set point, base station determines that terminal is middle point terminal.
Step S306, this base station is this terminal distribution detection sequence according to the type of above-mentioned terminal.
Timing is divided carrying out detection sequence in the base station of the present embodiment, and the Configuration Values that detection sequence is corresponding is searched according to the type of definite terminal in base station; Wherein, Configuration Values is that base station is set according to the type of terminal in advance, comprises the symbol that extraction spacing value in carrier wave number extraction mode and detection sequence use; Then, this base station is detection sequence corresponding to symbol that the above-mentioned extraction spacing value of terminal distribution and detection sequence use.
Consider that terminal has mobility, distance between itself and base station also can change, and the present embodiment divides timing carrying out detection sequence, is provided with the judgement cycle on base station, for the type of terminal not being adjudicated every a period of time, with the distribution of update detection sequence.Based on this, after accessing terminal to network, this base station is after terminal distribution detection sequence according to the type of terminal, said method also comprises: this base station judges in each judgement cycle whether the type of terminal changes, if so be, that terminal is redistributed detection sequence according to the type of the terminal after changing.
Wherein, base station judges in each judgement cycle whether the type of terminal changes and comprises:
After reaching when the leading decision cycle, the mean value R of the RSSI of the terminal of statistics in current determination cycles is calculated in base station i, i is greater than 1 integer; Calculate R i-1with R imean square deviation, wherein, R i-1for the mean value of the RSSI when the terminal of adding up in the upper judgement cycle in leading decision cycle; If mean square deviation is greater than the deviation threshold value of setting, base station determines that the type of this terminal changes; If mean square deviation is not more than the deviation threshold value of setting, base station determines that the type of this terminal does not change.
Base station is that terminal distribution detection sequence comprises according to the type of terminal: base station sends detection sequence Indication message to terminal, and wherein, detection sequence Indication message carries the detection sequence indication information of distribution.This terminal receives after detection sequence Indication message, will send detection sequence according to detection sequence indication information.
The Sounding sequence allocating method of the present embodiment, is applicable to TYPE category-A type and TYPE category-B type, is preferably applied in TYPE category-A type.Wherein, TYPE category-A type is divided into Cyclic and Decimation, different sequence types and different configurating terminals send the subcarrier number difference of Sounding sequence, consider that Cyclic mode requires terminal transmit power high, said method can be used in Decimation mode.
Sequence offset D value in Decimation mode, represents to send on a symbol user's number of Sounding sequence.D value is larger, and the Sounding user that can distribute on a symbol is more, and the Sounding sequence carrier number of each CU is fewer; And D value is less, the number of users that can distribute on a symbol is fewer, and the Sounding sequence carrier number of each CU is more.The transmitting power of terminal is limited, and the CINR (signal to noise ratio) in Sounding region arrives certain threshold value and could meet the demodulation of base station side, reaches good downlink wave beam and composes gain.Therefore the present embodiment adopts the distribution of control terminal Sounding sequence, makes the limited transmitting power of terminal of far point also can meet the transmitting of Sounding sequence, and near point user also can reach best excipient gain simultaneously.
The present embodiment carries out detection sequence distribution according to the distance of terminal and base station, has reduced the interference in Sounding region in whole net, can meet again the demodulation of base station side simultaneously, and the gain of obtaining descending excipient, has ensured carrying out smoothly of downlink wave beam excipient.
Embodiment 2
The present embodiment provides a kind of distribution method of detection sequence, and in the method, the Sounding sequence that base station and terminal room use is the Decimation mode in TYPE category-A type.The present embodiment for example, is estimated the distance of terminal and base station side by the channel condition (, RSSI) of terminal, terminal is divided into far, in, nearly three Terminal Types.Base station is before carrying out the distribution of detection sequence, divide Sounding Zone: base station is the information of the up Sounding Zone of initialization first, Sounding Zone is assigned as to 3 symbols, three symbol Sounding sequence types of Sounding Zone are fixed, be decided to be respectively different D values, three different D values of symbol are kept for respectively the user in far point region, midpoint area, near point region.Certainly, in there is no user assignment Sounding sequence, uply do not need to divide Sounding Zone, to save uplink bandwidth resource.
Because terminal transmit power is limited, far point terminal path loss is large, inevitable terminal transmit power is high, in order to meet base station side demodulation, power limited terminal need to be distributed on less carrier wave, avoid terminal transmit power saturated, therefore, for the Sounding sequence of far point terminal distribution is the Decimation mode of Type category-A type, D value value is greater than M;
For middle point terminal, compared with close to far point terminal, simultaneously for adjacent area distance, disturb littlely from base station, the Sounding carrier number that can distribute is more, and the power of terminal also can meet the transmitting of Sounding sequence, can be by the D value value [M, N] of middle point terminal.
For near point terminal, its path loss is little, and terminal transmit power does not exist saturated problem, and adjacent area interference is simultaneously little, in order to reach maximum beam shaping gain, can distribute more D value values be less than N Sounding carrier number.Base station is respectively the different symbol of terminal configuration of three types, and above-mentioned corresponding relation is as shown in table 1.
Table 1
Symbol 1 Symbol 2 Symbol 3
D＜N N＜D＜M D＞M
Near point terminal Middle point terminal Far point terminal
Based on above-mentioned corresponding relation, Fig. 4 shows the distribution method flow chart of the detection sequence of the present embodiment, and the method comprises the following steps:
Step S402, terminal initial access network, terminal to report DLRSSI;
Step S404, the DLRSSI mean value of base station counting statistics;
Step S406, base station judges whether > the first set point F of DLRSSI, if so, execution step S408; If not, execution step S410;
Step S408, base station determines that this terminal is near point terminal;
Step S410, base station judges whether < the second set point L of DLRSSI, if so, execution step S412; If not, execution step S414;
Step S412, base station determines that this terminal is far point terminal;
Step S414, base station determines that this terminal is middle point terminal;
Step S416, base station is this terminal distribution detection (Sounding) sequence according to the type of terminal.
Wherein, F and L are the thresholding of two DLRSSI setting in advance of base station, by between distance regions, be divided into far away in nearly 3 points.Wherein, far point terminal: DLRSSI < F; Middle point terminal: DLRSSI is between [F, L]; Near point terminal: DLRSSI > L.
Referring to Fig. 5, after base station access by terminal, in running, distribute the concrete steps of Sounding sequence as follows:
Step S502, base station side is received the DLRSSI of terminal to report, base station obtains downstream signal intensity from DLRSSI;
Step S504, base station side arrives the judgement cycle, the mean value of the DLRSSI of base station computing cycle statistics;
Step S506, base station side is determined the type of terminal according to the mean value of DLRSSI;
The interval falling into according to DLRSSI, estimate the distance of terminal and base station, if DLRSSI < is L, judge that terminal is far point terminal, if F < DLRSSI < is L, judge that terminal is middle point terminal, if DLRSSI > is F, judge that terminal is near point terminal.
Step S508, judges whether the type of terminal changes, if so, and execution step S510, if not, execution step S512.
Whether the type that judges terminal changes, and can adopt: the RSSI1 sample of preserving last time and the RSSI2 sample of recent statistics are asked to mean square deviation, if variance exceedes the deviation thresholding X of setting, illustrate that variation has occurred the type of terminal; Otherwise, illustrate that the type of terminal does not change.
Step S510, base station side indicating terminal stops original Sounding sequence and sends, for this terminal is redistributed Sounding sequence;
Step S512, finishes.
The present embodiment is divided three classes the type of terminal, be terminal distribution Sounding sequence according to Sounding sequence configuration information corresponding to three types, make the limited transmitting power of terminal can meet the transmitting of Sounding sequence, meet the demodulation requirement of base station side, reduced the interference in Sounding region in whole net simultaneously.
Embodiment 3
Fig. 6 shows according to the structured flowchart of the base station of the embodiment of the present invention, and this base station comprises:
Apart from acquisition module 62, for estimate the distance of terminal and base station according to the channel condition of terminal feedback;
Terminal initial access network, measures the distance of described terminal and described base station according to the received signal strength indicator RSSI of terminal feedback apart from acquisition module 62;
Type determination module 64, and is connected apart from acquisition module 62, determines the type of terminal according to the distance of estimating apart from acquisition module 62, and the type of terminal at least comprises: near point terminal and far point terminal;
Detection sequence distribution module 66, is connected with type determination module 64, for being terminal distribution detection sequence according to the type of the definite terminal of type determination module 64.
Type determination module 64 comprises:
The first determining unit, if be greater than the first set point for the distance of estimating, determines that terminal is near point terminal; If the distance of estimating is less than or equal to the first set point, determine that terminal is far point terminal.
Or if when the type of terminal also comprises middle point terminal, the type of the definite terminal of type determination module 64 also comprises: middle point terminal; Based on this, type determination module 64 comprises:
The second determining unit, if be greater than the first set point for the distance of estimating, determines that terminal is near point terminal; If the distance of estimating is less than the second set point, determine that terminal is far point terminal; If the distance of estimating is less than or equal to the first set point, and apart from being more than or equal to the second set point, determine that terminal is middle point terminal.
Detection sequence distribution module 66 comprises:
Search unit, for searching according to the type of definite terminal the Configuration Values that detection sequence is corresponding; Wherein, Configuration Values is that base station is set according to the type of terminal in advance, comprises extraction spacing value (being above-mentioned D value) in carrier wave number extraction mode and the symbol of detection sequence use;
Allocation units, detection sequence corresponding to symbol that is used to the above-mentioned extraction spacing value of terminal distribution and detection sequence to use.
The base station of the present embodiment judges in each judgement cycle whether the type of terminal changes, and if so, is that terminal is redistributed detection sequence according to the type of the terminal after changing.For example, after reaching when the leading decision cycle, the mean value R of the RSSI of the terminal of statistics in current determination cycles is calculated in base station i, i is greater than 1 integer; Calculate R i-1with R imean square deviation, wherein, R i-1for the mean value of the RSSI when the terminal of adding up in the upper judgement cycle in leading decision cycle; If mean square deviation is greater than the deviation threshold value of setting, base station determines that the type of terminal changes; If mean square deviation is not more than the deviation threshold value of setting, base station determines that the type of terminal does not change.
The base station of the present embodiment also comprises: sending module, for sending detection sequence Indication message to terminal, wherein, detection sequence Indication message carries the detection sequence indication information of distribution.
The present embodiment carries out detection sequence distribution according to the distance of terminal and base station, has reduced the interference in Sounding region in whole net, can meet again the demodulation of base station side simultaneously, and the gain of obtaining descending excipient, has ensured carrying out smoothly of downlink wave beam excipient.
As can be seen from the above description, the BF beam shaping technology that the present invention describes is the multi-antenna technology that carries out downlink wave beam excipient by uplink channel estimation, therefore needs to rely on up resource and channel condition and just can carry out beam shaping.The present invention has reduced the interference in Sounding region in whole net by Sounding sequence allocation, can meet again the demodulation of base station side simultaneously, obtains descending excipient gain.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation base station, they can concentrate on single calculation base station, or be distributed on the network that multiple calculation base stations form, alternatively, they can be realized with the executable program code of calculation base station, thereby, they can be stored in storage base station and be carried out by calculation base station, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, 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., within all should being included in protection scope of the present invention.

Claims (10)

1. a distribution method for detection sequence, is characterized in that, comprising:
The distance of described terminal and described base station is estimated in base station according to the channel condition of terminal feedback;
The type of described terminal is determined in described base station according to the described distance of estimating, the type of described terminal at least comprises: near point terminal and far point terminal;
Described base station is described terminal distribution detection sequence according to the type of described terminal, comprising: the Configuration Values that detection sequence is corresponding is searched according to the type of the described terminal of determining in described base station; Wherein, described Configuration Values is that base station is set according to the type of terminal in advance, comprises the symbol that extraction spacing value in carrier wave number extraction mode and detection sequence use; Described base station is to extract detection sequence corresponding to symbol that spacing value and detection sequence use described in described terminal distribution.
2. method according to claim 1, is characterized in that, described base station estimates that according to the channel condition of terminal feedback the distance of described terminal and described base station comprises:
Terminal initial access network, the distance of described terminal and described base station is measured in base station according to the received signal strength indicator RSSI of terminal feedback.
3. method according to claim 1, is characterized in that, described base station determines that according to the described distance of estimating the type of described terminal comprises:
If the described distance of estimating is greater than the first set point, described base station determines that described terminal is near point terminal;
If the described distance of estimating is less than or equal to described the first set point, described base station determines that described terminal is far point terminal.
4. method according to claim 1, is characterized in that, the type of described terminal also comprises: middle point terminal;
Described base station determines that according to the described distance of estimating the type of described terminal comprises:
If the described distance of estimating is greater than the first set point, described base station determines that described terminal is near point terminal;
If the described distance of estimating is less than the second set point, described base station determines that described terminal is far point terminal;
If the described distance of estimating is less than or equal to described the first set point, and described distance is more than or equal to described the second set point, and described base station determines that described terminal is middle point terminal.
5. method according to claim 1, is characterized in that, after described accessing terminal to network, described base station is after described terminal distribution detection sequence according to the type of described terminal, and described method also comprises:
Described base station judges in each judgement cycle whether the type of described terminal changes, and if so, is that described terminal is redistributed detection sequence according to the type of the described terminal after changing.
6. method according to claim 5, is characterized in that, described base station judges in each judgement cycle whether the type of described terminal changes and comprises:
After reaching when the leading decision cycle, the mean value R of the RSSI of the described terminal of statistics in described current determination cycles is calculated in described base station i, i is greater than 1 integer;
Calculate R i-1with R imean square deviation, wherein, R i-1for the mean value of the described RSSI that works as the described terminal of adding up in the upper judgement cycle in leading decision cycle;
If described mean square deviation is greater than the deviation threshold value of setting, described base station determines that the type of described terminal changes;
If described mean square deviation is not more than the deviation threshold value of described setting, described base station determines that the type of described terminal does not change.
7. according to the method described in claim 1-6 any one, it is characterized in that, described base station is that described terminal distribution detection sequence comprises according to the type of described terminal:
Described base station sends detection sequence Indication message to described terminal, and wherein, described detection sequence Indication message carries the detection sequence indication information of described distribution.
8. a base station, is characterized in that, comprising:
Apart from acquisition module, for estimate the distance of described terminal and described base station according to the channel condition of terminal feedback;
Type determination module, determines the type of described terminal according to the described described distance of estimating apart from acquisition module, and the type of described terminal at least comprises: near point terminal and far point terminal;
Detection sequence distribution module, for being described terminal distribution detection sequence according to the type of the definite described terminal of described type determination module, comprising: the Configuration Values that detection sequence is corresponding is searched according to the type of the described terminal of determining in described base station; Wherein, described Configuration Values is that base station is set according to the type of terminal in advance, comprises the symbol that extraction spacing value in carrier wave number extraction mode and detection sequence use; Described base station is to extract detection sequence corresponding to symbol that spacing value and detection sequence use described in described terminal distribution.
9. base station according to claim 8, is characterized in that, described type determination module comprises:
The first determining unit, if be greater than the first set point for the described distance of estimating, determines that described terminal is near point terminal; If the described distance of estimating is less than or equal to described the first set point, determine that described terminal is far point terminal.
10. base station according to claim 8, is characterized in that, the type of the described terminal that described type determination module is determined also comprises: middle point terminal;
Described type determination module comprises:
The second determining unit, if be greater than the first set point for the described distance of estimating, determines that described terminal is near point terminal; If the described distance of estimating is less than the second set point, determine that described terminal is far point terminal; If the described distance of estimating is less than or equal to described the first set point, and described distance is more than or equal to described the second set point, determines that described terminal is middle point terminal.
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