WO2014173352A1 - 一种位置确定方法、装置及计算机存储介质 - Google Patents
一种位置确定方法、装置及计算机存储介质 Download PDFInfo
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- WO2014173352A1 WO2014173352A1 PCT/CN2014/078145 CN2014078145W WO2014173352A1 WO 2014173352 A1 WO2014173352 A1 WO 2014173352A1 CN 2014078145 W CN2014078145 W CN 2014078145W WO 2014173352 A1 WO2014173352 A1 WO 2014173352A1
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- power value
- power
- segment
- dwpts
- value
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
-
- 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
- H04W72/0446—Resources in time domain, e.g. slots or frames
Definitions
- the present invention relates to the field of communications, and in particular, to a location determining method, apparatus, and computer storage medium. Background technique
- the physical channel of the Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system adopts a four-layer structure: superframe, radio frame, subframe, and slot/code.
- a superframe is 720ms long and consists of 72 radio frames, each of which is 10ms long.
- each radio frame is divided into two sub-frames of 5 ms.
- FIG. 1 is a schematic diagram of a slot structure of a TD-SCDMA system according to the related art.
- the time slot of each sub-frame is composed of It consists of 7 main time slots and 3 special time slots of length 675us.
- the three special time slots are composed of downlink pilot time slots (DwPTS, 75us), uplink pilot time slots (UpPTS, 125us), and guard intervals (GP, 75us).
- TsO is always allocated to the downlink
- Tsl is always allocated to the uplink
- other time slots can be used as uplink time slots or as downlink time slots.
- the uplink time slot and the downlink time slot are separated by a transition point.
- there are two transition points (UL to DL and DL to UL). The location of the transition point depends on the configuration of the uplink and downlink time slots on the cell.
- the cell search algorithm of the TD-SCDMA system is introduced below.
- 2 is a schematic diagram of functional modules of a cell initial search process of a TD-SCDMA system according to the related art.
- the initial cell search process mainly includes: Step 1: Search for a downlink synchronization (Sync-DL) code used by the current cell, Complete DwPTS synchronization; Step 2: Confirm the basic Midamble code and scrambling code of the current cell; Step 3: Complete control of multi-frame synchronization according to the phase modulation sequence of DwPTS; Step 4: Read wide Broadcast channel (BCH) information.
- Sync-DL downlink synchronization
- Step 2 Confirm the basic Midamble code and scrambling code of the current cell
- Step 3 Complete control of multi-frame synchronization according to the phase modulation sequence of DwPTS
- Step 4 Read wide Broadcast channel (BCH) information.
- BCH Broadcast channel
- Step 1 can be further divided into two sub-steps: sub-step 1, using the correlation method or energy window method to find the approximate DwPTS position; sub-step 2, using the correlation method to perform Sync-DL code confirmation.
- sub-step 1 using the correlation method or energy window method to find the approximate DwPTS position
- sub-step 2 using the correlation method to perform Sync-DL code confirmation.
- the accurate search of the initial DwPTS position in sub-step 1 is a key step in the cell search, directly related to the success or failure of the subsequent cell search step.
- the task of the DwPTS location search module is to find the approximate location of the Sync-DL code.
- Fig. 3 is a diagram for confirming the position of the DwPTS according to the energy window method of the related art.
- Fig. 3 considering that in the frame structure of TD-SCDMA, there are 32 chips of GP on the left side of the Sync-DL code, and 96 chips of GP on the right side, and the Sync-DL code itself is 64 chips. . Since the power of the GP is small, the power of the Sync-DL segment is larger than that of the GP in terms of the time distribution of the received power. When the sum of the Sync-DL segment power is divided by the sum of the power of 64 chips (32 chips on each side) on both sides, the obtained value is large.
- the approximate position of the DwPTS can be determined. It is therefore possible to search for the approximate position of the DwPTS by means of the power shape of the received signal to establish a power "feature window".
- the actual RF (Radio Frequency) input data has various interference factors such as RF noise floor and external electromagnetic interference, and the time-selective fading of the channel and the deviation of the sampling point also determine the cumulative power of DwPTS at 64 chips.
- the interference map in the cell search (CSR) may be a large fluctuation in the inside, as shown in the interference map in the cell search (CSR) according to the related art.
- an embodiment of the present invention provides a location determining method and apparatus.
- an embodiment of the present invention provides a location determining method, including: acquiring a first power value of a SYNC-DL segment in a DwPTS, a second power value of a first GP segment before a SYNC-DL segment, a third power value of the second GP segment after the SYNC-DL segment, and a fourth power value of the slot 0; according to the first power value, the second power value, the third power value, and the fourth power value Calculating the feature value of the DwPTS; determining the position of the DwPTS according to the feature value.
- Obtaining the first power value of the SYNC-DL segment includes: eliminating spike glitch in the DwPTS; and obtaining a first power value of the SYNC-DL segment in the DwPTS after removing the spike glitch.
- the value includes: setting a specified number of power points in the SYNC-DL segment, and sequentially calculating a specified number of power values at each power point; and sorting the specified number of power values to obtain an intermediate size power The value is multiplied by the specified number as the above first power value.
- Obtaining the fourth power value of the time slot 0 includes: obtaining a fourth power value of the basic code portion of the time slot 0.
- the above method further includes: setting a time slot between the SY C-DL segment and the first GP segment.
- an embodiment of the present invention further provides a location determining apparatus, where the apparatus includes: a power value acquiring module configured to acquire a first power value of a SYNC-DL segment in a downlink pilot time slot DwPTS, a second power value of the first GP segment before the SYNC-DL segment, a third power value of the second GP segment after the SYNC-DL segment, and a fourth power value of the slot 0; an eigenvalue calculation module configured to The first power value, the second power value, the third power value, and the fourth power value are calculated to obtain a feature value of the DwPTS; and the position determining module is configured to determine a position of the DwPTS according to the feature value.
- a power value acquiring module configured to acquire a first power value of a SYNC-DL segment in a downlink pilot time slot DwPTS, a second power value of the first GP segment before the SYNC-DL segment, a third power value of the second GP segment after the SYNC-
- the power value obtaining module includes: a glitch removing unit configured to eliminate a spike glitch in the DwPTS; and a first power value acquiring unit configured to acquire a first power value of the SYNC-DL segment in the DwPTS after eliminating a spike glitch .
- the first power value obtaining unit includes: a power point calculation subunit configured to set a specified number of power points in the SYNC-DL segment, and sequentially calculate a specified number of power values at each power point;
- the value determining subunit is configured to sort the power values of the specified number, and take the power value of the intermediate size and multiply the specified number as the first power value.
- the above feature value calculation module realizes the calculation operation of the feature value by the following calculation formula:
- the power value obtaining module includes: a fourth power value acquiring unit configured to acquire the foregoing time The fourth power value of the basic code portion of slot 0.
- a first power value of the SYNC-DL segment in the DwPTS a second power value of the first GP segment before the SY C-DL segment, and a second after the SYNC-DL segment
- the third power value of the GP segment and the fourth power value of the time slot 0 are calculated, and the eigenvalue of the DwPTS is calculated, and the position of the DwPTS is determined according to the eigenvalue, thereby solving the low success rate of the position determining scheme of the DwPTS in the related art.
- the problem is that the DwPTS eigenvalue calculation formula improves the resistance of various interference signals and timing deviations significantly, and the cell search success rate of the TD-SCDMA system is significantly improved.
- FIG. 1 is a schematic diagram showing a slot structure of TD-SCDMA according to the related art
- FIG. 2 is a functional block diagram of a cell initial search process of a TD-SCDMA system according to the related art
- FIG. 3 is a schematic diagram of confirming the position of the DwPTS according to the energy window method of the related art
- FIG. 4 is a schematic diagram of interference in the CSR according to the related art
- FIG. 5 is a flowchart of a location determining method according to an embodiment of the present invention.
- FIG. 6 is a schematic diagram of power calculation considering TsO according to an embodiment of the present invention.
- FIG. 7 is a schematic diagram of eigenvalues of a DwPTS extension according to an embodiment of the present invention
- FIG. 8 is a schematic diagram of eigenvalues of a midamble code in a TsO according to an embodiment of the present invention
- 9 is a block diagram showing the structure of a position determining apparatus according to an embodiment of the present invention. detailed description
- the present invention provides a method and apparatus for determining the position.
- the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
- FIG. 5 is a flowchart of a method for determining a location according to an embodiment of the present invention. As shown in FIG. 5, the method includes the following steps:
- Step S502 acquiring a first power value of the SYNC-DL segment in the DwPTS, a second power value of the first GP segment before the SYNC-DL segment, and a third power value of the second GP segment after the SYNC-DL segment, and the time Fourth power value of slot 0;
- Step S504 calculating a characteristic value of the DwPTS according to the first power value, the second power value, the third power value, and the fourth power value;
- Step S506 determining the location of the DwPTS according to the feature value.
- the first power value of the SYNC-DL segment in the DwPTS the second power value of the first GP segment before the SYNC-DL segment, and the second GP segment after the SYNC-DL segment.
- the third power value and the fourth power value of the time slot 0 are calculated, and the eigenvalue of the DwPTS is calculated, and the position of the DwPTS is determined according to the eigenvalue, thereby solving the problem that the success rate of the position determining scheme of the DwPTS in the related art is low.
- the new DwPTS eigenvalue calculation formula significantly enhances the resistance to various interference signals and timing deviations, and the cell search success rate of the TD-SCDMA system is significantly improved.
- the TsO can be added to the original eigenvalue calculation formula.
- the original eigenvalue formula can calculate a large eigenvalue, and the previous 64chips have obvious TsO power, the eigenvalue formula obtained is considered to be true. This can filter most of the glitch, as shown in Figure 6, which considers the power calculation of TsO.
- the formula for calculating the eigenvalue can be expressed as ⁇ ( ⁇ + 4) / 2
- the embodiment provides an implementation manner, that is, calculating a characteristic value of the DwPTS according to the first power value, the second power value, the third power value, and the fourth power value,
- Characteristic value (first power value + fourth power value) / 2
- the embodiment provides an implementation manner, that is, the first power value of the SYNC-DL segment is obtained, including: eliminating DwPTS Spike in the thorn; after removing the spike burr
- the first power value of the SYNC-DL segment in the DwPTS is the first power value of the SYNC-DL segment in the DwPTS.
- Power2 power2_tmp(2,: ) Each group has 8chips. These eight groups are set to eight power points, and eight power values are respectively calculated, and then the size is sorted, and the fourth largest power value is multiplied by 8, as the first power value of the SYNC-DL segment.
- the embodiment provides an implementation manner, that is, obtaining the elimination of the spike glitch
- the first power value of the SY C-DL segment in the subsequent DwPTS includes: setting a specified number of power points in the SYNC-DL segment, and sequentially calculating a specified number of power values at each power point; The power values are sorted by size, and the power value of the intermediate size is multiplied by the specified number as the first power value.
- Max(Power 2, Power 4) x 2 + c ground, the eigenvalue of the DwPTS is calculated according to the first power value, the second power value, the third power value, and the fourth power value, and is implemented by the following formula:
- the eigenvalue of DwPTS extension shown in Figure 7 is shown in SYNC- An interval slot (GAP) is set between the DL segment and the first GP segment.
- the GAP can be 16 chips or 8 chips or other values.
- TsO may have uneven signal energy. It is further considered that the TsO data (data) may be offset by each other in the case of fewer code channels, resulting in zero TsO energy value.
- the problem that the eigenvalue is too small is taken, and the basic code midamble code is constant for determining the cell, and the power is relatively stable. Therefore, the midamble portion of the TsO can be used as the P4, and the eigenvalues of the midamble code in the TsO as shown in FIG. 8 are obtained. Take the schematic.
- Obtain The fourth power value of time slot 0 includes: obtaining a fourth power value of the basic code portion of time slot 0. Through the above embodiments, the fourth power value is more stable and more accurate, thereby improving the accuracy of the eigenvalue calculation.
- the technical solution of the embodiment of the present invention can greatly improve the success rate of the TD-SCDMA cell search coarse synchronization.
- the eigenvalue search algorithm is a key step, which directly affects the performance of the CSR.
- the coarse synchronization method determines the coarse synchronization position by calculating the DwPTS characteristic value, that is, the energy ratio of the DwPTS signal and the before and after GAP.
- the basic DwPTS eigenvalue calculation formula does not meet the actual needs, and often finds the location of the erroneous DwPTS feature signal, thereby reducing the success of the sweep and cell search. rate.
- the robust DwPTS eigenvalue algorithm given in the embodiment of the present invention significantly enhances the resistance to various interference signals and timing deviations. In practice, the new DwPTS eigenvalue algorithm is used, and the cell search success rate of the TD-SCDMA system reaches 99. %the above.
- the following describes an implementation method for performing cell search coarse synchronization using a cell search for a TD-SCDMA system as an embodiment.
- the specific implementation steps are as follows:
- the two DwPTS power accumulation values are Pwr_sum(k-2), Pwr_sum(k-3), and the two power accumulation values are accumulated as P2 Second power value.
- the two DwPTS power accumulated values are Pwr_sum(k+4) and Pwr_sum(k+5), respectively, and the two power accumulated values are accumulated as P3. Third power value.
- the four TsO power accumulation values are Pwr_sum(k-33), Pwr_sum(k-32), Pwr_sum(k-31), Pwr_sum(k-30), respectively.
- the four power accumulated values are accumulated as the third power value of P4.
- the 400-point power accumulation value is used cyclically, that is, for the position k+delta modulo, mod(k+delta, 400) And select the corresponding value in the 400 point power accumulation value.
- the numerator and denominator are each added with a constant factor.
- this constant factor C is an empirical value and is related to the previous interception process;
- the eigenvalue engvalue is calculated by the following formula:
- Engvalue (min([Pl,P4]) + C)/(max([P2,P3])*2 + C)).
- a total of 400 engvalue values can be obtained, and the largest value is the DwPTS position.
- the simple eigenvalue algorithm is only applicable to a high SNR non-interference environment. Once a glitch or low SNR environment is encountered, the success rate will be greatly reduced, and the robust eigenvalue algorithm can be used to ensure More than 99% of the cell search success rate greatly improves the anti-interference ability of the CSR algorithm.
- FIG. 9 is a structural block diagram of a position determining apparatus according to an embodiment of the present invention. As shown in FIG. 9, the apparatus includes: a power value acquiring module 10, an eigenvalue calculating module 20, and a position determining module 30. The structure is described in detail below.
- the power value obtaining module 10 is configured to acquire a first power value of the SYNC-DL segment in the DwPTS, a second power value of the first GP segment before the SYNC-DL segment, and a third GP segment after the SYNC-DL segment. a power value, and a fourth power value of time slot 0;
- the eigenvalue calculation module 20 is connected to the power value acquisition module 10, and configured to calculate the eigenvalue of the DwPTS according to the first power value, the second power value, the third power value, and the fourth power value;
- the location determining module 30 is coupled to the feature value calculation module 20 and configured to determine the location of the DwPTS based on the feature values.
- the power value acquisition module 10 acquires the following four power values: a first power value of the SYNC-DL segment in the DwPTS, a second power value of the first GP segment before the SYNC-DL segment, and a SYNC-DL segment.
- the third power value of the second GP segment and the fourth power value of the time slot 0 the feature value calculation module 20 calculates the feature value of the DwPTS according to the above four power values, and the location determining module 30 determines the location of the DwPTS according to the feature value.
- the problem that the success rate of the DwPTS location determining scheme in the related art is low is solved.
- the DwPTS eigenvalue calculation formula is improved, and the new DwPTS eigenvalue calculation formula is resistant to various interference signals and timing deviations. Significantly enhanced, the cell search success rate of the TD-SCDMA system is significantly improved.
- the power value obtaining module 10 includes: a glitch removing unit configured to eliminate spike glitch in the DsPTS; and a first power value acquiring unit configured to acquire a first power of the SYNC-DL segment in the DwPTS after eliminating spike glitch value.
- the first power value obtaining unit includes: a power point calculation subunit configured to be in the above A specified number of power points are set in the SY C-DL segment, and a specified number of power values are sequentially calculated at each power point; the first power value determining subunit is configured to sort the power values of the specified number of times And taking the power value of the intermediate size and multiplying by the specified number as the first power value.
- the above feature value calculation module 20 implements the calculation operation of the feature value by the following calculation formula:
- ⁇ ⁇ min( m ⁇ 3 ⁇ 4 it,m gg3 ⁇ 4 it ) + 3 ⁇ 43 ⁇ 4 ⁇ 3 ⁇ 4
- the power value obtaining module 10 includes: a fourth power value acquiring unit configured to acquire a fourth power value of the basic code portion of the time slot 0.
- the glitch elimination unit, the power point calculation subunit, the first power value determination subunit, the eigenvalue calculation module, the position determination module, and the fourth power value acquisition unit may be used by a central processing unit (CPU, Central) in the position determining device.
- CPU Central
- Processing Unit Digital Signal Processor (DSP, Digital Signal Processor) or Programmable Array (FPGA).
- the new DwPTS eigenvalue calculation formula significantly enhances the resistance to various interference signals and timing deviations.
- the glitch can be significantly improved.
- DwPTS extended resistance Therefore, the cell search success rate of the TD-SCDMA system can reach more than 99%.
- embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the invention can take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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JP2016539399A JP6262861B2 (ja) | 2013-09-04 | 2014-05-22 | 位置確定方法、装置およびコンピュータ記憶媒体 |
US14/916,728 US9930630B2 (en) | 2013-09-04 | 2014-05-22 | Position determination method and device, and computer storage medium |
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CN201310398724.1A CN104427614B (zh) | 2013-09-04 | 2013-09-04 | 一种位置确定方法及装置 |
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US11072356B2 (en) | 2016-06-30 | 2021-07-27 | Transportation Ip Holdings, Llc | Vehicle control system |
US10814893B2 (en) | 2016-03-21 | 2020-10-27 | Ge Global Sourcing Llc | Vehicle control system |
US10819462B2 (en) * | 2017-10-23 | 2020-10-27 | General Electric Company | System and method for protecting communication in time-sensitive networks using shared secret information |
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CN101106394A (zh) * | 2007-08-10 | 2008-01-16 | 中兴通讯股份有限公司 | Td-scdma系统中搜索下行导频时隙的方法 |
CN101242221A (zh) * | 2008-03-12 | 2008-08-13 | 北京天碁科技有限公司 | 一种检测上行导频信道上受到的干扰的装置和方法 |
CN102457325A (zh) * | 2010-10-19 | 2012-05-16 | 中兴通讯股份有限公司 | 一种小区搜索粗同步的方法及装置 |
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CN1263322C (zh) | 2003-08-06 | 2006-07-05 | 大唐移动通信设备有限公司 | Td-scdma移动通信系统小区初始搜索中的增益控制方法 |
KR20060102442A (ko) * | 2005-03-23 | 2006-09-27 | 엘지전자 주식회사 | 이동통신 시스템의 타임슬롯 동기 검출방법 |
US8971348B2 (en) * | 2012-10-31 | 2015-03-03 | Qualcomm Incorporated | Allocation of voice idle time period for inter-RAT measurement |
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CN101106394A (zh) * | 2007-08-10 | 2008-01-16 | 中兴通讯股份有限公司 | Td-scdma系统中搜索下行导频时隙的方法 |
CN101242221A (zh) * | 2008-03-12 | 2008-08-13 | 北京天碁科技有限公司 | 一种检测上行导频信道上受到的干扰的装置和方法 |
CN102457325A (zh) * | 2010-10-19 | 2012-05-16 | 中兴通讯股份有限公司 | 一种小区搜索粗同步的方法及装置 |
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CN104427614B (zh) | 2019-03-22 |
US20160198423A1 (en) | 2016-07-07 |
US9930630B2 (en) | 2018-03-27 |
CN104427614A (zh) | 2015-03-18 |
JP6262861B2 (ja) | 2018-01-17 |
JP2016533124A (ja) | 2016-10-20 |
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