CN105208650A - Positioning method and apparatus - Google Patents
Positioning method and apparatus Download PDFInfo
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- CN105208650A CN105208650A CN201410300722.9A CN201410300722A CN105208650A CN 105208650 A CN105208650 A CN 105208650A CN 201410300722 A CN201410300722 A CN 201410300722A CN 105208650 A CN105208650 A CN 105208650A
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Abstract
The invention relates to a method for positioning user equipment in a base station of a wireless communication system, wherein the base station comprises at least one remote wireless unit. The method includes the following steps that: the base station determines at least one remote wireless unit from the at least one remote wireless unit, channel quality between the least one remote wireless unit and the user equipment being optimal; and the base station positions the user equipment according to the position of the at least one remote wireless unit with optimal channel quality.
Description
Technical field
The present invention relates to communication technical field, particularly relate to wireless communication technology field.
Background technology
In recent years, the architecture evolution of wireless communication system is such trend: distributed base station system.Traditional distributed base station system is exactly by the Base Band Unit (BaseBandUnit of base station, be called for short BBU) be separated with remote radio units (RemoteRadioHead is called for short RRH), and by transmission mediums such as optical fiber (fiber), BBU and RRH is coupled together.And in the latest development, occurred a BBU to be connected with multiple RRH, more distributed deployment way, i.e. distributed RRH system.As shown in Figure 1, in such a system, each RRH completes the conversion of digital baseband signal to radiofrequency signal separately, and BBU is responsible for the signal from each RRH to merge composition upward signal, is also responsible for downstream signal to be assigned to each RRH simultaneously.This layout is particularly useful for the application scenarios such as in-door covering, thus just day by day receives the concern of industry.
Along with the application of distributed RRH expands gradually, a problem is had just to become more and more important.That is exactly the location of how to carry out subscriber equipment (UserEquipment is called for short UE) under the structure of distributed RRH.Under traditional architecture of base station, the common method of positioning UE is all with the position of base station for benchmark, no matter be comparatively rough cell designation (CellID) positioning mode, (being namely approximately UE position with the position of serving BS); Still comparatively accurate signal arrival time difference (ObservedTimeDifferenceOfArrival is called for short OTDOA) method, (namely UE measures the time of advent of the downstream signal that several different base station sends, then according to the different times of advent, with the position of these base stations for benchmark draws the position hyperbola of UE), all with position, base station for benchmark carries out.And an implicit here restrictive condition is, the position at position, base station i.e. RRH place, only meet this prerequisite, just correspondingly can calculate the transmission range (OTDOA) of air traffic channel or ignore the transmission range (CellID) of air traffic channel.
Obviously, this restrictive condition is not suitable for distributed RRH system, because in distributed RRH system, and more than one and different from base station (i.e. BBU) position of the position of RRH.If continue to use traditional localization method, must by the appreciable position error of introducing.Such as in CellID method, the position at BBU place may differ greatly with the physical location of UE, because the position of UE is actually and is determined by the coverage of RRH, and owing to being be connected by wired transmissions medium such as optical fiber between BBU and RRH, therefore can on geographical position wide apart.And in OTDOA method, the transmission path of BBU to UE has been no longer also pure air traffic channel, but the wire message way part contained between BBU to RRH, therefore can not directly be used for the time of advent that UE observes calculating the transmission range of air traffic channel, further, because wire transmission part can adopt non-directional route, the result thus making OTDOA method draw contains larger error.
Obviously, can not again using base station location as benchmark in distributed RRH system positioning UE, more reasonably select to be that suitable RRH position is as benchmark, but when multiple RRH coexists, signal received by UE is also the mixed signal coming from multiple RRH, and existing UE itself can not determine which is only suitable RRH.So target of the present invention is exactly find a kind of new localization method; This method needs can make can locate accurately in distributed RRH system; Do not change the design of existing UE again, also will compatible as much as possible existing specification, avoid the change of existing protocol excessive.
Summary of the invention
For solving the aforementioned problems in the prior, the present invention proposes a kind of new localization method.Determine suitable RRH by analyzing channel quality by base station, thus meet accuracy and compatible requirement simultaneously.
Particularly, according to a first aspect of the invention, propose a kind of method of locating user devices in the base station of wireless communication system, wherein, described base station comprises at least one remote radio units, and described method comprises: described base station is determined at least one remote radio units described and at least one remote radio units that between described subscriber equipment, channel quality is best; Described subscriber equipment is located according to the position of best at least one remote radio units of described channel quality in described base station.
Preferably, described determining step also comprises described base station and determines that at least one remote radio units described, each remote radio units receives Signal to Interference plus Noise Ratio or the signal to noise ratio of the upward signal of described subscriber equipment respectively; The remote radio units with maximum described Signal to Interference plus Noise Ratio or signal to noise ratio is defined as at least one best remote radio units of described channel quality.
More preferably, described determining step also comprises the remote radio units difference of described Signal to Interference plus Noise Ratio or signal to noise ratio and described maximum described Signal to Interference plus Noise Ratio or signal to noise ratio being less than the first predetermined value and is also defined as at least one best remote radio units of described channel quality.
More preferably, the upward signal of described subscriber equipment is Sounding Reference Signal.
More preferably, described base station is not the serving BS of described subscriber equipment, described determining step also comprises: receive the first message from described subscriber equipment serving BS, and wherein, described first message comprises the information indicating described user device channel detection reference signal configuration state.
More preferably, described first message is by X2 interface transmission.
More preferably, described positioning step comprises: described base station adopts signal arrival time difference method to locate described subscriber equipment, wherein, with the position of best at least one remote radio units of described channel quality for benchmark determines the position hyperbola of described subscriber equipment.
More preferably, described positioning step comprises: described base station is using the position of best at least one remote radio units of described channel quality as the position of described subscriber equipment.
According to a second aspect of the invention, propose a kind of equipment of assist location subscriber equipment in the base station of wireless communication system, wherein, described base station comprises at least one remote radio units, described equipment comprises: determination module, determines at least one remote radio units described and at least one remote radio units that between described subscriber equipment, channel quality is best for described base station.
Preferably, described determination module comprises: the first determining unit, determines that at least one remote radio units described, each remote radio units receives Signal to Interference plus Noise Ratio or the signal to noise ratio of the upward signal of described subscriber equipment respectively for described base station; Second determining unit, for being defined as at least one best remote radio units of described channel quality by the remote radio units with maximum described Signal to Interference plus Noise Ratio or signal to noise ratio.
More preferably, described determination module also comprises: the 3rd determining unit, is also defined as at least one best remote radio units of described channel quality for the remote radio units difference of described Signal to Interference plus Noise Ratio or signal to noise ratio and described maximum described Signal to Interference plus Noise Ratio or signal to noise ratio being less than the first predetermined value.
More preferably, the upward signal of described subscriber equipment is Sounding Reference Signal.
More preferably, described base station is not the serving BS of described subscriber equipment, described equipment also comprises: receiver module, for receiving the first message from described subscriber equipment serving BS, wherein, described first message comprises the information indicating described user device channel detection reference signal configuration state.
More preferably, described first message is by X2 interface transmission.
More preferably, described first determining unit comprises buffer unit, receives the upward signal of described subscriber equipment for remote radio units each at least one remote radio units described in buffer memory.
More preferably, described first determining unit with the described upward signal of buffer memory in buffer unit described in predetermined cycle polling, thus determines that described each remote radio units receives described Signal to Interference plus Noise Ratio or the signal to noise ratio of described upward signal respectively.
In the present invention, by using RRH position best for channel quality as benchmark, ensure that to UE location accuracy; By being determined the operation of best RRH by base station, ensure that without the need to changing existing UE; Farthest keep compatible with existing specification simultaneously.
Accompanying drawing explanation
Read the following detailed description to non-limiting example by referring to accompanying drawing, further feature of the present invention, object and advantage will be more obvious.
Fig. 1 shows the schematic diagram according to a kind of distributed RRH system of the present invention;
Fig. 2 shows the flow chart of the method according to a kind of positioning UE of the present invention;
Fig. 3 shows the block diagram of the equipment according to a kind of assist location UE on base station of the present invention.
Wherein, same or analogous Reference numeral represents same or analogous steps characteristic or device/module.
Embodiment
In the specific descriptions of following preferred embodiment, with reference to the accompanying drawing formed appended by a part of the present invention.Appended accompanying drawing shows by way of example and can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiments of the present invention.Be appreciated that under the prerequisite not departing from scope of the present invention, other embodiments can be utilized, also can carry out amendment that is structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention limited by appended claim.
First, according to a typical application scenarios of the present invention, there is the base station that has distributed RRH system, multiple RRH of this base station are distributed in the geographical position different from base station location respectively, and at least one UE is served in this base station.In order to locate this UE accurately, first this base station must be determined in above-mentioned multiple RRH, that RRH top-quality with the air traffic channel of this UE.This principle is wherein, although the downstream signal that UE receives is mixed by the signal from multiple RRH, but wherein dominant signal must be the signal coming from that best RRH of channel quality, hereinafter, leading RRH is referred to as by with the air traffic channel of this UE that RRH top-quality.So core thinking of the present invention is exactly first determine leading RRH by base station, then determine the position of above-mentioned UE according to the position of this leading RRH.
On this basis, according to one embodiment of present invention, a kind of method of positioning UE on the base station of distributed RRH is proposed.Concrete, Signal to Interference plus Noise Ratio or the signal to noise ratio of the upward signal of this UE that each RRH receives are determined in this base station first, then Signal to Interference plus Noise Ratio or maximum that RRH of signal to noise ratio are defined as leading RRH.There is positive correlation, so the quality of corresponding down channel can be determined easily by the quality of up channel here between the up-downgoing channel quality considering air traffic channel.The benefit done like this is without the need to changing at UE place, decreases impact during actual deployment.The upward signal received due to all RRH all can pass back to base station (BBU) by fiber, so base station only need be improved a little just can determine Signal to Interference plus Noise Ratio on each RRH or signal to noise ratio completely respectively.Can be described in detail by environment division later about this part.
Preferably, in the present invention, the leading RRH being greater than can also be determined.When considering reality, the channel quality of more than one RRH may be had all closer to each other, namely in the mixed signal received at UE, the accounting of their respective signals is also close, reflection is exactly the immediate vicinity that UE can be in these RRH in position, at this moment, we can set first predetermined value as thresholding, and the difference of Signal to Interference plus Noise Ratio or signal to noise ratio and maximize SINR or signal to noise ratio is less than those RRH of this thresholding also as main non-irrigated RRH.So just obtain the set of a leading RRH, position operation with the position of each RRH in set respectively as benchmark, more accurate UE position can be obtained.
Further, the Sounding Reference Signal (SoundingReferenceSignaling is called for short SRS) of UE can be used in the present invention.Owing to natively there being the detection for SRS signal in existing agreement, thus further simplify realization of the present invention.Meanwhile, because this base station is the serving BS of UE, therefore the SRS configuration of UE inherently can be known in base station, thus SRS signal of can decoding easily.
And implement in scene at of the present invention another, this distributed RRH base station can not be the serving BS of UE, and such as, in OTDOA method, UE also needs the downstream signal of receiving neighbor bs.In this case, basic skills of the present invention stands good, this non-serving base stations still can determine that by the SRS signal detecting UE this base station corresponds to the leading RRH of this UE, difference is, here, this base station needs the first message receiving the transmission of UE serving BS, and this first message is used to the SRS signal configures of informing this UE, this non-serving base stations is known how to decode the SRS signal of UE, thus for subsequent step.
Preferably, this first message can be transmitted by the inter-base station interface X2 defined in existing specification.The compliance to existing protocol can be met like this, reduce and change.
Further, after determining leading RRH, just can navigate to UE according to the position of leading RRH.Concrete, in the occasion that positioning accuracy request is not high, CellID method can be used, position by this leading RRH is similar to the position (or when having multiple leading RRH, the center of the position of the plurality of leading RRH being similar to the position as this UE) as this UE; Or, in the occasion that positioning accuracy request is higher, OTDOA method can be used, namely with the position of this leading RRH for benchmark draws the position hyperbola of this UE (or when having multiple leading RRH, with the position of the plurality of leading RRH for benchmark draws many position hyperbolas, determine the position of UE with the position of intersection point).
Although it is pointed out that above-described embodiment describes the base station of distributed RRH, be equally applicable to the traditional base station of non-distributed RRH.Now, can be that the base station of multiple distributed RRH and the traditional base station of non-distributed RRH participate in location jointly.When traditional base station, a base station only has a RRH, and be in same position with base station, so the position of applying the leading RRH that this method obtains is exactly the position of base station, namely the benchmark used in follow-up positioning step is exactly the position of base station, and result is consistent with existing localization method.
Figure 2 shows the flow chart according to above-mentioned execution mode, comprising:
S21. described base station is determined at least one remote radio units described and at least one remote radio units that between described subscriber equipment, channel quality is best;
S22. described subscriber equipment is located according to the position of best at least one remote radio units of described channel quality in described base station.
Below come again in conjunction with block diagram to introduce the equipment corresponding with said method provided by the present invention.
Figure 3 show the equipment 30 according to a kind of assist location subscriber equipment in the base station of wireless communication system of the present invention, wherein, described base station comprises at least one RRH, and described equipment 30 comprises:
Determination module 3001, to determine in RRH for base station and best that of channel quality between UE, namely determination module 3001 is for determining leading RRH.
Two determining units can be comprised in this determination module 3001:
First determining unit, determines Signal to Interference plus Noise Ratio or the signal to noise ratio of the upward signal of this UE that each RRH receives respectively for base station;
Second determining unit, determines leading RRH for base station, by above-mentioned channel make an uproar than or maximum that RRH of signal to noise ratio be defined as leading RRH.
As previously mentioned, can determine that more than one RRH takes RRH as the leading factor in the present invention, at this moment, we can set first predetermined value as thresholding, so can also comprise in determination module 3001:
3rd determining unit, for being less than those RRH of this thresholding also as leading RRH using the difference of Signal to Interference plus Noise Ratio or signal to noise ratio and maximize SINR or signal to noise ratio.
Same, determination module 3001 can select SRS signal to carry out above-mentioned determination operation, when this base station is not the serving BS of UE, in order to obtain the SRS configuration information of UE, can also comprise in determination module 3001:
Receiver module, for receiving the first message of the serving BS from UE, wherein, the first message comprises the information of the SRS signal configures situation of instruction UE.Further, this receiver module receives above-mentioned first message by X2 interface.
As preferably, consider the frequency of positioning action and the Hypomobility feature (especially at the typical scene that indoor environment distributed RRH applies) of UE, the frequency that module 3001 carries out determination operation can be reduced further, namely without the need to carrying out the decode operation of SRS in real time, but can by row decoding again after upward signal buffer memory.So, can also comprise in determination module 3001:
Buffer unit, the upward signal of the UE received on each RRH of buffer memory.
On this basis, the mode of poll further can be adopted to carry out the decoding of upward signal, thus avoid concurrent type frog and to decode the high implementation complexity brought.Namely determination module 3001 can with predetermined cycle polling the upward signal of buffer memory in above-mentioned buffer unit, thus determine Signal to Interference plus Noise Ratio or the signal to noise ratio of each RRH respectively.
Be described embodiments of the invention above, but the present invention is not limited to specific system, equipment and concrete agreement, those skilled in that art can make various distortion or amendment within the scope of the appended claims.
The those skilled in the art of those the art can pass through research specification, disclosed content and accompanying drawing and appending claims, understand and implement other changes to the execution mode disclosed.In the claims, word " comprises " element and step of not getting rid of other, and wording " one " does not get rid of plural number.In the present invention, " first ", " second " only represent title, do not represent orbution.In the practical application of invention, the function of the multiple technical characteristics quoted during a part possibility enforcement of rights requires.Any Reference numeral in claim should not be construed as the restriction to scope.
Claims (16)
1. the method for locating user devices in the base station of wireless communication system, wherein, described base station comprises at least one remote radio units, and described method comprises:
A. described base station is determined at least one remote radio units described and at least one remote radio units that between described subscriber equipment, channel quality is best;
B. described subscriber equipment is located according to the position of best at least one remote radio units of described channel quality in described base station.
2. method according to claim 1, wherein, described step a comprises:
A2. described base station determines that at least one remote radio units described, each remote radio units receives Signal to Interference plus Noise Ratio or the signal to noise ratio of the upward signal of described subscriber equipment respectively;
A3. the remote radio units with maximum described Signal to Interference plus Noise Ratio or signal to noise ratio is defined as at least one best remote radio units of described channel quality.
3. method according to claim 2, wherein, also comprises after described step a3:
A4. the remote radio units difference of described Signal to Interference plus Noise Ratio or signal to noise ratio and described maximum described Signal to Interference plus Noise Ratio or signal to noise ratio being less than the first predetermined value is also defined as at least one best remote radio units of described channel quality.
4. method according to claim 2, wherein, the upward signal of described subscriber equipment is Sounding Reference Signal.
5. method according to claim 4, wherein, described base station is not the serving BS of described subscriber equipment, also comprises before described step a2:
A1. receive the first message from described subscriber equipment serving BS, wherein, described first message comprises the information indicating described user device channel detection reference signal configuration state.
6. method according to claim 5, wherein, described first message is by X2 interface transmission.
7. method according to any one of claim 1 to 6, wherein, described step b comprises:
Described base station adopts signal arrival time difference method to locate described subscriber equipment, wherein, with the position of best at least one remote radio units of described channel quality for benchmark determines the position hyperbola of described subscriber equipment.
8. method according to any one of claim 1 to 6, wherein, described step b comprises:
Described base station is using the position of best at least one remote radio units of described channel quality as the position of described subscriber equipment.
9. the equipment of assist location subscriber equipment in the base station of wireless communication system, wherein, described base station comprises at least one remote radio units, and described equipment comprises:
Determination module, determines at least one remote radio units described and at least one remote radio units that between described subscriber equipment, channel quality is best for described base station.
10. equipment according to claim 9, wherein, described determination module comprises:
For described base station, first determining unit, determines that at least one remote radio units described, each remote radio units receives Signal to Interference plus Noise Ratio or the signal to noise ratio of the upward signal of described subscriber equipment respectively;
Second determining unit, for being defined as at least one best remote radio units of described channel quality by the remote radio units with maximum described Signal to Interference plus Noise Ratio or signal to noise ratio.
11. equipment according to claim 10, wherein, described determination module also comprises:
3rd determining unit, is also defined as at least one best remote radio units of described channel quality for the remote radio units difference of described Signal to Interference plus Noise Ratio or signal to noise ratio and described maximum described Signal to Interference plus Noise Ratio or signal to noise ratio being less than the first predetermined value.
12. equipment according to claim 10, wherein, the upward signal of described subscriber equipment is Sounding Reference Signal.
13. equipment according to claim 11, wherein, described base station is not the serving BS of described subscriber equipment, and described equipment also comprises:
Receiver module, for receiving the first message from described subscriber equipment serving BS, wherein, described first message comprises the information indicating described user device channel detection reference signal configuration state.
14. equipment according to claim 12, wherein, described first message is by X2 interface transmission.
15. according to claim 10 to the equipment according to any one of 14, and wherein, described first determining unit comprises buffer unit, receives the upward signal of described subscriber equipment for remote radio units each at least one remote radio units described in buffer memory.
16. equipment according to claim 15, wherein, described first determining unit with the described upward signal of buffer memory in buffer unit described in predetermined cycle polling, thus determines that described each remote radio units receives described Signal to Interference plus Noise Ratio or the signal to noise ratio of described upward signal respectively.
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