CN102088764A - Method and system for sending positioning reference signal - Google Patents
Method and system for sending positioning reference signal Download PDFInfo
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- CN102088764A CN102088764A CN2009102243647A CN200910224364A CN102088764A CN 102088764 A CN102088764 A CN 102088764A CN 2009102243647 A CN2009102243647 A CN 2009102243647A CN 200910224364 A CN200910224364 A CN 200910224364A CN 102088764 A CN102088764 A CN 102088764A
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Abstract
The invention discloses a method and a system for sending a positioning reference signal. A remote base station and a serving base station which correspond to a mobile terminal send the positioning reference signals in a plurality of positioning reference signal sending chances; the remote base station sends the positioning reference signals in at least two sending chances, and the number of sending chances in which the serving base station sends the positioning reference signals is less than or equal to that of the sending chances in which the remote base station sends the positioning reference signals, so the detected possibility of the signals of the remote base station is enhanced, the measuring precision is increased, and the positioning performance is improved.
Description
Technical Field
The present invention relates to positioning technologies, and in particular, to a method and a system for transmitting a positioning reference signal.
Background
The currently used wireless Positioning method includes CELL-Based service (CELL-ID/RTT), Observed Time Difference of Arrival (OTDOA), Network-Assisted GPS (a-GPS) Positioning, and hybrid Positioning.
The OTDOA method is a positioning method commonly used in a wireless network, and is a default positioning technology of WCDMA. The OTDOA is a method with higher positioning accuracy, the method measures the arrival time difference of the downlink signals of different cells through a mobile station to obtain the downlink transmitting synchronization difference of different cells, combines the two to obtain the propagation time difference of the signals of different cells arriving at the mobile station, further obtains the propagation distance difference, and then obtains the position of the mobile station by utilizing the hyperbolic positioning principle. Generally speaking, the more base stations the mobile station measures, the higher the measurement accuracy, and the more obvious the improvement of the positioning performance.
However, there are often "hearing" problems in OTDOA localization techniques. When the mobile station is very close to the serving base station, the signal strength of the transmitter is much higher than the strength of the transmitters of other non-serving base stations, so the mobile station cannot accurately measure the signals of the non-serving base stations, cannot acquire the time difference of arrival of the signals between different transmitters, and the OTDOA positioning method will fail at this time.
For the "hearing" problem in OTDOA, the existing solution is to use an Idle Downlink Period (IPDL), that is, to turn off all Downlink signal transmissions of the serving base station within a short time interval, so as to improve the probability of detecting signals of other non-serving remote base stations by the mobile station. In a specific implementation, the OTDOA-IPDL also has a corresponding problem, and generally, the downlink positioning reference signal uses various existing pilot signals, which are responsible for synchronization reference signals, cell identification, channel estimation, and other tasks, and stopping sending such signals may cause additional problems in synchronization and other aspects.
In order to solve the problems of OTDOA-IPDL, the prior art defines a part of wireless signal resources, sets multiple positioning reference signal transmitting opportunities therein, and allows each base station to transmit the positioning reference signal again in the part of wireless signal resources, so that the originally covered base station signal can be detected with an opportunity to avoid the signal of the serving base station, thereby naturally forming a solution similar to IPDL solution. However, due to the complexity of the actual environment, the positioning reference signal transmitted again is likely to be on the same signal position as the signal of the serving base station again, and thus covered again.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and a system for sending a positioning reference signal, which can improve the probability of detecting the positioning reference signal, improve the measurement accuracy, and improve the positioning performance.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of transmitting a positioning reference signal, the method comprising:
in a wireless positioning service LBS positioning reference area, a remote base station corresponding to a mobile terminal sends positioning reference signals in at least two of a plurality of positioning reference signal transmitting opportunities in the LBS positioning reference area;
a service base station corresponding to the mobile terminal sends positioning reference signals in a plurality of positioning reference signal transmitting opportunities in an LBS positioning reference area, wherein the number of the positioning reference signals sent by the service base station is less than or equal to the sending number of the remote base stations;
and the mobile terminal carries out positioning by utilizing the detected positioning reference signal.
A system for transmitting a positioning reference signal comprises a service base station and a remote base station corresponding to a mobile terminal,
the remote base station is used for sending positioning reference signals in at least two of a plurality of positioning reference signal transmission opportunities in a wireless positioning service LBS positioning reference area;
the service base station is used for sending positioning reference signals in a plurality of positioning reference signal transmitting opportunities in an LBS positioning reference area, and the number of the sent positioning reference signals is less than or equal to the sending number of the remote base station;
and the mobile terminal carries out positioning by utilizing the detected positioning reference signal.
The method and the system for sending the positioning reference signal provided by the invention have the advantages that the remote base station and the service base station corresponding to the mobile terminal send the positioning reference signal in a plurality of positioning reference signal sending opportunities, the remote base station sends the positioning reference signal in at least two sending opportunities, and the number of the sending opportunities occupied by the service base station for sending the positioning reference signal is smaller than or equal to that of the remote base station, so that the detection probability of the remote base station signal is improved, the measurement precision is improved, and the positioning performance is improved.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a diagram illustrating a sending region of a positioning reference signal according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of an embodiment of the present invention;
fig. 4 is a schematic diagram of positioning reference signals transmitted by each base station in the embodiment of the present invention.
Detailed Description
In the detailed description of the present section, preferred embodiments of the present invention are shown and described, simply by way of illustration of the best mode contemplated by the inventors of carrying out the invention. It will be appreciated that modifications may be made in the various obvious aspects without departing from the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In view of this, the present invention provides a technical solution for sending a positioning reference signal, where a remote base station and a serving base station corresponding to a mobile terminal both send the positioning reference signal in multiple positioning reference signal sending opportunities, and the number of sending opportunities occupied by the serving base station for sending the positioning reference signal is smaller than or equal to that of the remote base station by enabling the remote base station to send the positioning reference signal in at least two sending opportunities, so as to improve the probability of detecting the signal of the remote base station.
The invention discloses a method for sending a positioning reference signal, which comprises the following steps: in the LBS positioning reference area, a far-end base station corresponding to the mobile terminal sends positioning reference signals in at least two of a plurality of positioning reference signal transmission opportunities in the LBS positioning reference area; a service base station corresponding to the mobile terminal sends positioning reference signals in a plurality of positioning reference signal transmitting opportunities in an LBS positioning reference area, wherein the number of the positioning reference signals sent by the service base station is less than or equal to the sending number of the remote base stations; and the mobile terminal carries out positioning by utilizing the detected positioning reference signal. When determining the specific number of transmissions, the actual reasons of the base stations, such as the coverage area of the cell and the user density, may be determined according to the actual system.
The base station corresponds to a set of transceiving system, and corresponds to the concept of sector in the multi-sector base station system, the positioning reference signal transmitting opportunity mentioned in the invention can be a symbol, but is not limited to a symbol, and the transmitting opportunity can be the time frequency resource occupied by a group of time/frequency signals which can be measured by the mobile terminal in a timing way. In order to facilitate understanding of the technical solutions of the present invention, the embodiments are described mainly by taking symbols as examples.
In the case that the transmission opportunities of the serving base station and the remote base station are equal, when the transmission opportunities of the plurality of positioning reference signals are even number Q, the serving base station preferably transmits the positioning reference signalsThe number of the transmission opportunities selected by the service base station and the remote base station is Q/2; when the number of the multiple positioning reference signal transmission opportunities is an odd number P, the serving base station and the remote base station preferably select the number of the transmission opportunities to be (P-1)/2 or (P + 1)/2. Specifically, when all base stations use the same transmission times, assuming that the transmission opportunity is M times and the selected transmission times are N times, there will be a case where
The probability of combination is that when the base station determines the transmission mode, the remote base station and the serving base station have a coincidence in mode
It is clear that when M is even, this probability falls to a minimum when N is M/2. When M is an odd number, N ═ M-1)/2 and N ═ M +1)/2 fall to a minimum value. In this case where M is an odd number, N ═ M-1)/2 is better than N ═ M +1)/2 in order to reduce the overall interference level and reduce the number of transmissions.
After the far-end base station and the serving base station corresponding to the mobile terminal determine the sending times, the transmission signal position in the positioning reference signal transmission opportunity can be selected in a random or fixed mode.
In addition, the invention also provides a system for sending the positioning reference signal. Referring specifically to fig. 1, the system includes a serving base station and a remote base station corresponding to a mobile terminal. The remote base station is used for sending the positioning reference signals in at least two of a plurality of positioning reference signal transmission opportunities in the LBS positioning reference area; the service base station is used for sending positioning reference signals in a plurality of positioning reference signal transmitting opportunities in the LBS positioning reference area, and the number of the sent positioning reference signals is less than or equal to the sending number of the remote base station; and the mobile terminal carries out positioning by utilizing the detected positioning reference signal.
Under the condition that the number of the transmission opportunities selected by the service base station and the remote base station is equal, when the number of the transmission opportunities of the plurality of positioning reference signals is even number Q, the number of the transmission opportunities selected by the service base station and the remote base station is Q/2; when the number of the transmitting opportunities of the plurality of positioning reference signals is an odd number P, the number of the transmitting opportunities selected by the serving base station and the remote base station is (P-1)/2 or (P +1)/2, so that the detection probability of the remote base station can be effectively improved, and the measurement accuracy is improved.
When the mobile terminal detects a plurality of signals belonging to the same base station, the optimal signal is selected as the signal used for positioning. In the technical scheme of the invention, the optimal signal can be determined by using the signal-to-noise ratio.
The technical solution of the present invention is described in more detail by a specific example below. In the technical scheme of the invention, the main description is that in the IEEE802.16m system, the serving base station and the remote base station use the same times to transmit the positioning reference signals.
In the present embodiment, the set multiple positioning reference signal transmission opportunities are the first sub-frames in the last 5 ms frame in the 20 ms superframe structure, as can be seen in fig. 2 in particular. This region occupies 5 sign bits with 5 transmission opportunities. When there are 5 transmission opportunities, optimally, the serving base station and the remote base station can select 2 of them to transmit. The specific process can be seen in fig. 3.
In step 301, the serving base station and the remote base station of the mobile terminal select 2 transmission opportunities from the set 5 transmission opportunities to transmit the positioning reference signal.
When selecting the positioning reference signal, the terminal may check the signal through full search as long as the selected positioning reference signal or the selected positioning reference signal set is independently identifiable, and the signal may uniquely determine the corresponding base station. For example, it may be a pilot symbol, a leading pilot symbol (preamble), a middle pilot symbol (midamble), a synchronization channel, a pilot channel, etc.
Wherein, the base station can fixedly or randomly select 2 of the 5 transmission opportunities, and the number of the 5 transmission opportunities is from 0 to 4. In particular, a linear congruence sequence X may be employedp＝(aXp-1+ c) modm generation. Wherein,Xpfor a randomly selected p-th transmission opportunity; x1The characteristic value of the cell can be set, and the cell characteristic value is unique within a certain geographic coverage range which can be detected by the terminal, namely the characteristic value of each cell; a, c, and m are preset parameters, for example, a is 219, c is 0, and m is 4093. After determining the first transmitting position X1mod 5, the random selection continues in the same way for the remaining transmit opportunities until all transmit opportunities are selected. E.g. initial X1101, 101 mod 5 is 1, corresponding to the second transmission opportunity; corresponding to X2At 219 x 101+ 0mod 4093 at 594, at 5 at 4, corresponding to the 5 th transmission opportunity.
In addition, the transmission bit can be randomly selected by setting a random number mapping rule. When randomly selecting the sending bit, the random number mapping rule is used to map the characteristic pilot symbol sequence of the cell to select the sending opportunity. The random number mapping specification referred to herein is a common rule employed by those skilled in the art in obtaining random numbers. For example, assuming that the characteristic pilot symbol sequence 2 is 0b.. 110010, 3 bits can be located from the next time, and 0b010 mod 5 ═ 2 is used to obtain the first transmission opportunity, i.e., the 3 rd bit in 5 sign bits; after removing this transmitter, get the second transmission opportunity with 0b110mod 4 ═ 2, and the 3 rd transmission opportunity of the remaining 4 transmission opportunities, after the initial 3 rd sign bit is occupied, corresponds to the 4 th bit of the 5 sign bits (confirming if it is correct at a glance). This in turn results in the transmitted bits for each base station.
The serving base station a occupies 3, 4 transmission opportunities, the remote base station B occupies 1, 3 transmission opportunities, and the remote base station C occupies 2, 3 transmission opportunities, as shown in fig. 4. Since the positioning reference signal of the remote base station B on the transmission bit 1 is not covered and the positioning reference signal of the remote base station C on the transmission bit 2 is not covered, the terminal near the base station a will successfully detect the base station B, C, thereby improving the detection probability of the remote base station. Peer-to-peer, terminals near base stations B, C also have the opportunity to successfully detect the signal of base station a.
In step 302, the mobile terminal detects a positioning reference signal transmitted by each base station, and performs positioning using the detected positioning reference signal.
After detecting a plurality of signals belonging to the same base station, the mobile terminal selects the optimal signal as a signal for positioning. The mobile terminal can select the optimal signal from the multiple signals according to the signal-to-noise ratio to be used for positioning.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for transmitting a positioning reference signal, the method comprising:
in a wireless positioning service LBS positioning reference area, a far-end base station corresponding to a mobile terminal sends positioning reference signals in at least two of a plurality of positioning reference signal transmitting opportunities in the LBS positioning reference area;
a service base station corresponding to the mobile terminal sends positioning reference signals in a plurality of positioning reference signal transmitting opportunities in an LBS positioning reference area, wherein the number of the positioning reference signals sent by the service base station is less than or equal to the sending number of the remote base stations;
and the mobile terminal carries out positioning by utilizing the detected positioning reference signal.
2. The method of claim 1, wherein in case the number of transmissions of the serving base station and the remote base station are equal,
when the number of the multiple positioning reference signal transmitting opportunities is even Q, the number of the transmitting opportunities selected by the serving base station and the remote base station is Q/2;
when the number of the multiple positioning reference signal transmission opportunities is an odd number P, the number of the transmission opportunities selected by the serving base station and the remote base station is (P-1)/2 or (P + 1)/2.
3. The method according to claim 1 or 2,
according to a linear congruence sequence Xp＝(aXp-1+ c) modm gets the transmit opportunity;
wherein, XpFor the p-th transmitter, X1And a, c and m are preset parameters which are characteristic values of the located cell.
4. The method of claim 1 or 2, wherein the transmission opportunity is obtained by mapping the characteristic pilot symbol sequence of the cell in which the random number mapping rule is used.
5. A method according to claim 1 or 2, characterized in that the method further comprises:
and after detecting a plurality of signals belonging to the same base station, the mobile terminal selects the optimal signal as a signal for positioning.
6. A system for transmitting a positioning reference signal, the system comprising a serving base station and a remote base station corresponding to a mobile terminal,
the remote base station is used for sending positioning reference signals in at least two of a plurality of positioning reference signal transmission opportunities in a wireless positioning service LBS positioning reference area;
the service base station is used for sending positioning reference signals in a plurality of positioning reference signal transmitting opportunities in an LBS positioning reference area, and the number of the sent positioning reference signals is less than or equal to the sending number of the remote base station;
and the mobile terminal carries out positioning by utilizing the detected positioning reference signal.
7. The system of claim 6,
under the condition that the transmission opportunity numbers of the serving base station and the far-end base station are equal, when the set transmission opportunity numbers of the plurality of positioning reference signals are even numbers Q, the transmission opportunity number selected by the serving base station and the far-end base station is Q/2; when the set transmission opportunity number of the plurality of positioning reference signals is an odd number P, the transmission opportunity number selected by the serving base station and the remote base station is (P-1)/2 or (P + 1)/2.
8. The system of claim 6 or 7,
and after detecting a plurality of signals belonging to the same base station, the mobile terminal selects the optimal signal as a signal for positioning.
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| CN2009102243647A CN102088764A (en) | 2009-12-02 | 2009-12-02 | Method and system for sending positioning reference signal |
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| CN103096460A (en) * | 2011-10-27 | 2013-05-08 | 上海贝尔股份有限公司 | Method, device and system of sending PRS and locating user device |
| CN104080163A (en) * | 2013-03-28 | 2014-10-01 | 北京百度网讯科技有限公司 | Method and device for determining access position information of wireless access device |
| CN105025521A (en) * | 2014-04-28 | 2015-11-04 | Jdsu英国有限公司 | Method and apparatus for deriving cell characteristic values |
| CN105188025A (en) * | 2015-06-04 | 2015-12-23 | 深圳信息职业技术学院 | Method and system for sending positioning reference signals |
| CN105532058A (en) * | 2013-09-07 | 2016-04-27 | 高通股份有限公司 | Blind search for network positioning reference signal (prs) configuration parameters |
| WO2016070674A1 (en) * | 2014-11-05 | 2016-05-12 | 中兴通讯股份有限公司 | Method and device for enhancing positioning |
| WO2017012110A1 (en) * | 2015-07-23 | 2017-01-26 | 华为技术有限公司 | Positioning method and device thereof |
| CN106415304A (en) * | 2014-01-24 | 2017-02-15 | 高通股份有限公司 | Methods, apparatuses, and devices for processing positioning reference signals |
| WO2017063121A1 (en) * | 2015-10-12 | 2017-04-20 | 华为技术有限公司 | Method and apparatus for sending positioning reference signal |
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| CN103096460B (en) * | 2011-10-27 | 2015-11-25 | 上海贝尔股份有限公司 | A kind of method, device and system sending PRS and consumer positioning device |
| CN103096460A (en) * | 2011-10-27 | 2013-05-08 | 上海贝尔股份有限公司 | Method, device and system of sending PRS and locating user device |
| CN104080163A (en) * | 2013-03-28 | 2014-10-01 | 北京百度网讯科技有限公司 | Method and device for determining access position information of wireless access device |
| CN105532058A (en) * | 2013-09-07 | 2016-04-27 | 高通股份有限公司 | Blind search for network positioning reference signal (prs) configuration parameters |
| CN106415304B (en) * | 2014-01-24 | 2020-03-10 | 高通股份有限公司 | Method, equipment and device for processing positioning reference signal |
| CN106415304A (en) * | 2014-01-24 | 2017-02-15 | 高通股份有限公司 | Methods, apparatuses, and devices for processing positioning reference signals |
| CN105025521B (en) * | 2014-04-28 | 2018-02-27 | 维亚威解决方案英国有限公司 | Method and apparatus for exporting cell characteristic value |
| CN105025521A (en) * | 2014-04-28 | 2015-11-04 | Jdsu英国有限公司 | Method and apparatus for deriving cell characteristic values |
| WO2016070674A1 (en) * | 2014-11-05 | 2016-05-12 | 中兴通讯股份有限公司 | Method and device for enhancing positioning |
| CN105188025A (en) * | 2015-06-04 | 2015-12-23 | 深圳信息职业技术学院 | Method and system for sending positioning reference signals |
| CN105188025B (en) * | 2015-06-04 | 2018-08-21 | 深圳信息职业技术学院 | A kind of sending method and system of location reference signals |
| WO2017012110A1 (en) * | 2015-07-23 | 2017-01-26 | 华为技术有限公司 | Positioning method and device thereof |
| WO2017063121A1 (en) * | 2015-10-12 | 2017-04-20 | 华为技术有限公司 | Method and apparatus for sending positioning reference signal |
| CN108029090A (en) * | 2015-10-12 | 2018-05-11 | 华为技术有限公司 | Positioning reference signal sending method and device |
| CN109564269A (en) * | 2016-08-11 | 2019-04-02 | 索尼移动通讯有限公司 | The positioning of mobile device |
| CN109564269B (en) * | 2016-08-11 | 2023-11-10 | 索尼集团公司 | Mobile device, base station, network node and method for performing the same |
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Application publication date: 20110608 |