CN1285094A - Apparatus and method for signal detection by base station in mobile communication system - Google Patents
Apparatus and method for signal detection by base station in mobile communication system Download PDFInfo
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- CN1285094A CN1285094A CN98813711A CN98813711A CN1285094A CN 1285094 A CN1285094 A CN 1285094A CN 98813711 A CN98813711 A CN 98813711A CN 98813711 A CN98813711 A CN 98813711A CN 1285094 A CN1285094 A CN 1285094A
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- 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
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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Abstract
The present invention provides a method of detection of signals in a communication network (100) (e.g. cellular) including a mobile terminal (120), at least one first base station (104) serving the mobile terminal (120) and at least one second base station (108) wherein the method includes mobile transmitted data detected at the first base station being used by the second base station to increase detection of the transmitted data by the second base station.
Description
The present invention relates to be used for the method and apparatus of detection signal, especially in the cellular communications network that needs locating information and quick handover operation.
In cellular communications networks, as IS 95, like closed loop and open loop type transmission power control with the portable terminal of a base station communication, this in fact means by this way the portable terminal transmitted power is carried out optimization, promptly on serving BS, the signal level that receives is in the fully substantially invariable minimum level of detection that is used for by the desired quality settings of communication link.If portable terminal is to communicate by letter with an above serving BS, for example, at soft handover in the cycle, the signal (or combination of above two kinds of technology) that the power of combination or strong cohesiveness are received is retained as a kind of substantially invariable minimum level for fully detecting by the desired quality settings of communication link.The multiple access that power control mechanism guarantees in the sub-district that is covered by serving BS or an outer portable terminal causes disturbs and remains minimum value.
Though in divide multiple access (DS-CDMA) system as direct sequence spread spectrum codes, power control be desirable and or even necessary indispensable, yet, reduced the ability of not serving the base station of given portable terminal in order fully and reliably to receive and detect the transmission of portable terminal.By the base station beyond the serving BS to portable terminal transmission carry out reliable detection for as " location " and " switching " service of operating be desirable.Therefore, wish to increase non-serving base stations detectability and to the portable terminal through-put power without any increase, make and can utilize the received signal that is lower than for the minimum required level of sufficient information Data Detection to obtain information as propagation time time-delay (distance just) and portable terminal signal power strength.
The present invention preferably sets about increasing by the detectability of cellular communications network to the portable terminal signal transmitted, or the detectability of the signal that is sent and detected by portable terminal by first and second base stations.
Therefore, a first aspect of the present invention provides a kind of and is comprising a portable terminal, at least one serves the signal detecting method in the communication network (for example honeycomb fashion) of first base station He at least one second base station of this portable terminal, and wherein the method comprises by second base station and uses in first base station detected data that sent of moving to increase the detection probability of second base station to the data that sent.
Best, the signal that received by first base station has enough quality, so that can detect the data that signal sent thus.Better way is, uses these detected data by second base station, not by the occasion so that enough power interface of suitable detection are received, can detect this data in the portable terminal transmission by second base station.
The testing process of second base station can be relevant based on serial, and matched filtering is relevant, maximum-likelihood sequence estimation, any combination of joint-detection or Multiuser Detection or these methods.
Testing process on second base station preferably includes the existence that detects the data that detect first base station.
Testing process on second base station preferably includes the detection and the calculating of being propagated the receive time delay that causes because of the distance from each base station to portable terminal by signal.
The received signal power of the portable terminal transmission signals that detection is received by second base station can be added or alternatively be comprised to testing process on second base station.
Portable terminal is preferably by first base station services on the communication channel.Better way is, this communication channel is a communication traffic channel, and access channel (access channel) or control channel can divide into groups or the work of circuit switch mode.
This cellular communications network preferably direct sequence spread spectrum codes divides multiple access (DS-CDMA) system, preferably by the time of integration long on the base station, these data is used to expand and increase the processing gain of receiver.Be more preferably, this net system is GSM or GSM derived system.
By for example, utilize the time delay that on each base station separately, receives, utilize direction from each base station separately to this portable terminal; The perhaps combination of time delay of Jie Shouing and/or the direction from first base station to portable terminal and the time delay that receives and/or the direction from second base station to portable terminal can be determined the position of this portable terminal from this net system.
Utilize the fixed base stations of three or more known location to determine that the process of mobile terminal locations is known in the technology of triangulation or trilateration.
Best, receive data by first base station at least and can discern portable terminal in this net system.
The switching that the signal power of the portable terminal that measures can be used for from first base station to second base station is prepared.
Best, the data that sent by portable terminal are unknown information datas.
By the data of portable terminal transmission, alternatively, or additionally, preferably a kind of predefined sequence.
Can be used by the station of second base station or alternative second base station by the data that first base station receives.To improve detection to the data that send by mobile radio station.
Best, on second base station, adopt spatial filter, to reduce propagation channel influence to received signal.
A second aspect of the present invention provide a kind of in comprising a plurality of base stations and communications of Mobile Terminals net (for example honeycomb fashion) system of detection signal, wherein at least one base station is a serving BS on the given time, and this portable terminal is by this serving BS service; This serving BS can receive and detect the data that sent to it by this portable terminal, and these detected data can be used the detection probability that sends data to increase by other base station of serving BS and/or at least one.
Now method by way of example only is described with reference to the drawings one embodiment of the invention, wherein:
Fig. 1 is the sketch map of a kind of common embodiment of the present invention.
Fig. 2 is the parts sketch map that first base station portion in one embodiment of the invention is shown.
Fig. 3 is the parts sketch map that second base station portion in one embodiment of the invention is shown.
Fig. 4 is the diagrammatic representation of the data frame structure that sent by first and second base stations in typical case.
Fig. 5 illustrates the parts sketch map that is used for a kind of scrambler of Frame scramble shown in Figure 4 and spread spectrum.
Fig. 6 is the diagrammatic representation of the data frame structure that sent by portable terminal in typical case.
Fig. 7 illustrates the parts sketch map that is used for a kind of scrambler of Frame scramble shown in Figure 6 and spread spectrum.
Fig. 8 is illustrated in first base station operating procedure flow chart partly that briefly illustrates among Fig. 2.
Fig. 9 is illustrated in second base station operating procedure flow chart partly that briefly illustrates among Fig. 3.
A kind ofly be installed in a geographic area, for example, the cellular system 100 (Fig. 1) of down town 102 comprises first base station 104 with first relevant area of coverage 106 and second base station 108 with second relevant area of coverage 110, and the 3rd base station and the relevant area of coverage 111.
At first, the second and the 3rd base station 104,108,107 is connected to a base station controller (BSC) 112 independently, and BSC112 is connected to a mobile switching centre (MSC) 114.MSC114 communicates by letter with a fixing terminal 116 by public switched telecom net (PSTN) 118.
An example of the first, the second and the 3rd base station 104,108,107 is Supercell (trade mark) base station elements of being made by Motorola.The Supercell base station has the hardware and/or the software of suitable modification, so that can work with time delays estimation unit 220,320.Portable terminal 120 is positioned at first area of coverage 106 and second area of coverage 110.Yet it is dispensable to be positioned at second area of coverage 110 for portable terminal 120.Portable terminal 120 can be positioned at the second and the 3rd area of coverage 110,111 near.
Example as portable terminal 120 is the cell phone of Qualconn QCP/820 type.
Comprise receiver chain 200 with reference to figure 2, the first base stations 104, receiver chain 200 has the antenna 202 that is coupled to low noise amplifier 204.Low noise amplifier 204 is linked band pass filter 206.Band pass filter 206 is linked frequency mixer 208.Frequency mixer 208 is linked low pass filter 212 and synthesizer unit 210, and low pass filter 212 is linked A-D converter (ADC) 214, and the latter links digital signal processor (DSP) 218 by buffer 216.
Buffer 216 is also linked the time-delay estimation unit, and time-delay estimation unit 220 is also linked DSP218.In time-delay estimation unit 220, multiplier 222 is linked in buffer output.Multiplier 222 is linked integrator 224 and Variable delay unit 226.Integrator unit 224 is linked peak detector 230, and on the symbol period Ts that is sent with the data integrate that receives, in the beginning of each associative operation, the beginning of each data symbol that receives just, integral unit is set to initial value zero.Processor 232 is linked in the output of peak detector 230.Variable delay unit 226 had both been linked processor 232 and had also been linked coding unit 228.At last, clock 234 is linked processor unit 232.Clock 234 is also linked coding unit 228.
Receiver had both also carried out work with the form (being complex data) of quadrature phase component with homophase.
Receiver chain 200 described above also can be formed the part of transmitter-receiver circuit (not shown) only for shown in the serve exemplary purposes.
With reference to figure 3, the second and the 3rd base station 108,107, each comprises a receiver chain 300, and receiver chain 300 has an antenna 302 that is coupled to low noise amplifier 304.Low noise amplifier 304 is linked band pass filter 306.Band pass filter 306 is linked frequency mixer 308.Frequency mixer 308 is linked low pass filter 312 and synthesizer unit 310.Low pass filter 312 is linked A-D converter (ADC) 314, and the latter is linked a buffer 316.Buffer unit is linked time-delay estimation unit 320.At time-delay estimation unit 320, multiplier 322 is linked in buffer output.
Receiver chain not only with homophase but also carry out work with the form (being complex data) of quadrature phase component.
At first, the second and the 3rd base station 104,108,107 can both send a series of 20msec Frames with data frame structure 400 (shown in Fig. 4).Frame 400 has the information data of comprising part 436,438,440,442, and 444,446,448,450,452,454,456,458, a kind of structure of 460,462,464,466,468.Frame structure 400 also comprises 16 power control data parts, 404,406,408,410,412,414,416,418,420,422,424,426,428,430,432,434.
With reference to figure 5, data are at multiplier 512, by LC sign indicating number 504 scrambles and spread spectrum.Data at multiplier 514 by Walsh sign indicating number 506 further scrambles.Then, resulting scramble data is transmitted in multiplier 516 usefulness I sign indicating numbers 510 quilts scramble once more for homophase, is transmitted in multiplier 518 usefulness Q sign indicating numbers 508 quilts scramble once more for quadrature phase.The scramble and the spreading code of gained in this example, are called as scrambling code 502.
Scrambling code 502 is used to calculate various parameters, for example, and channel estimating, the coherent detection of frame synchronization and data.The operation of portable terminal 120 is synchronized to scrambling code 502.
Portable terminal 120 can send the 20msec sequence of data frames with data structure 600.Frame 600 is grouped into by information data part mostly.
Frame 600 is by scrambler 700 scrambles and spread spectrum.Spread spectrum is the signalling bandwidth of broadening Frame 600.Scrambler 700, comprise several to the all-network parts, base station 104,107 and 108 and the known sign indicating number 704,708,706 of portable terminal 120 just.
With reference to figure 7.Data are at multiplier 710 usefulness LC sign indicating number 704 scrambles and spread spectrums.Then, resulting scramble and spread spectrum data are for the homophase transmission, at multiplier 712, with I sign indicating number 708 scramble once more, for the quadrature phase transmission, at multiplier 714, with Q sign indicating number 706 scramble once more, resulting scramble and spreading code in this example, are called as scrambling code 702.
Now will be in the operation of the above cellular system 100 of following description.
Set up calling according to technical any known method.Communicating by letter with portable terminal 120 in first base station 104, and distributes one first communication traffic channel (tch).Frame with first data frame structure 400 sends and is received by portable terminal 120 from first base station 104.Frame with second data frame structure 600 sends from portable terminal 120, is received by first base station 104.First base station 104 is by means of power control data 404,406,408,410, and the well-known technically technology of 412,414,416,418,420,422,424,426,428,430,432,434 foundations is controlled the transmitted power of portable terminal.Just delay time and the enough power of information data by the Frame 600 that first antenna for base station 202 receives for correctly detecting the propagation times by first base station 104.With regard to information data, the meaning is the unknown message data that exist in Frame 400 and Frame 600.
Therefore, portable terminal 120 transmitted powers are enough big for the propagation loss that overcomes first base station 104 just.The second and the 3rd base station 108 of not communicating by letter with portable terminal 120,107 may suffer excessive propagation loss, make them can not have for reliable and successful detection time delay and the enough power of information data and receive the Frame 600 that is sent by portable terminal 120.
A kind of method that detects information data 828 and time delay 824 that is used for first base station 104 summarily is drawn in Fig. 8 and is described in down.The synthesizer 210 of first base station 104 was tuned to and receives the Frame 600 (step 806) that sends from portable terminal 120 on the time of advent of expection.
Then, (step 808) determined in first base station 104, whether receives whole Frame 600 through time enough.Consider because the longest propagation delay that the distance between first base station 104 and the portable terminal 120 causes.If also do not pass through time enough, first base station 104 continues to receive and storing communication business datums (step 806), when time of defined through out-of-date, first base station 104 returns to zero (step 810) with the time delay (T) of expection.
Then, the scrambling code 702 when sending Frames 600 by portable terminal 120 similarly goes the time delay T time-delay (step 812) of scrambling code (this is known in the sign indicating number simultaneous techniques) with defined.The scrambling code 702 that goes of first base station, 104 usefulness time-delay goes the data business volume that receives to scramble (step 814).On data symbol period T s, will go the data business volume addition (integration) (step 818) of scramble then.
If first base station 104 does not detect big peak value, the time delay T of expection is increased (with one group of numerical value) (step 820), step 812, and 814,816,818 and 820 are repeated until and detect till the big peak value.After detecting big peak value, calculate and storage time delay and the further distance of calculating from portable terminal 120 (step 822) first base station 104.
Existing under the situation of multipath transmisstion, may detect several peak values, wherein one or more peak values can be used for Data Detection.
After the time delay of successfully estimating between first base station 104 and the portable terminal 120, in the correct part (step 826) of being chosen the communication service data that receives by the Frame part 600 of portable terminal 120 transmissions, detection and storage package are contained in the information data (step 828) in the Frame 600 then.
Time delay between first base station 104 and portable terminal 120 and distance are sent to MSC114, and are stored.
A kind of time delay detecting method that is used for second base station 108 summarily is drawn in Fig. 9 and is described in down.
The synthesizer 310 of second base station 108 is tuned to the time of advent of Frame 600 expections, to receive the Frame 600 (step 902) that sends from portable terminal 120, when second base station 108 received communication service data in official hour, communication service data was stored (step 906).
(step 908) determined in second base station then, and time enough process so that receive whole Frame 600, is considered the longest desired propagation time delays that is caused by the distance between second base station 108 and the portable terminal 120.If do not pass through time enough as yet, second base station 108 continues to receive and storing communication business datum (step 906).When official hour process, second base station 108 is by network components, and for example, BSC112 obtains and is stored in step 828 and detected and canned data data 318 (step 910) by first base station 104.
319 stored information datas 318 are handled in second base station 108 then, and with scrambling code 702,328 with send before the Frame 600, by 120 pairs of original information datas of portable terminal carry out handle with the similar mode of scramble to its scramble and with its storage (step 912).After step 912, the stored information data of having handled with scramble is called as " data are removed scrambling code " now, is substantially similar to the envelope and the phase place of the Frame 600 that is sent by portable terminal 120.
Second base station 108 carries out the time delay T of expection is returned to zero (step 916) then.Follow with the time delay T that stipulates " data are removed scrambling code " time-delay (step 918).Second base station, 108 usefulness " data are removed scrambling code " go the data traffic that receives to scramble (step 920), on sufficiently long time T i, will go the data traffic addition (integration) of scramble then, to guarantee reliably and successfully to detect the Frame 600 (step 922) that portable terminal 120 sends.The Ti long enough to be to provide enough processing gains, solve all possible, with comparing of standing by first base station 104, the too much propagation loss that stands by second base station 108.
Second base station 108 is determined then, and the result as addition detects a big peak value (step 928).If second base station 108 does not detect peak value, the time delay T of expection is increased (step 924), step 918,920,922,926 and 924 be repeated until that big peak value is detected till.After acceptable peak value detected, calculated and storage time delay and the further distance (step 928) of calculating portable terminal 120 from second base station 108 second base station 108.
The operation of the 3rd base station 107 a kind of basically with above be the identical time delay detecting method of method that explain second base station 108.
Time delay between second base station 108 and portable terminal 120 and distance are sent to MSC114 and are stored.Time delay between the 3rd base station 107 and portable terminal 120 and distance are sent to MSC114 and are stored.MSC114 utilizes the portable terminal of being stored 120 from the first and second and the 3rd base station 104,108 by a kind of method that is called triangulation technically, 107 range data, the first, the second and the 3rd known base station 104,108,107 coordinate is estimated the coordinate of portable terminal 120.
The remaining part of a cellular communication system base station is well-known technically, need not be described in detail at this.
Just described the above embodiment of the present invention by way of example, as those skilled in the art is understood easily, can do various characteristics change or modification within the scope of the invention the content of having described.
Claims (24)
1. one kind is comprising a portable terminal, at least one serves the method for detection signal in the communication network of first base station of this portable terminal and at least one second base station, wherein this method comprises that detected portable terminal sends data in first base station by the use of second base station, to increase the detection probability of second base station to sent data.
2. according to the method for claim 1, wherein the signal that is received by first base station has enough quality, can detect the data of signal transmission thus, and use these detected data by second base station, when portable terminal transmits not by the enough power interface time receiving with abundant detection, can detect this data by second base station.
3. according to the method for claim 1 or 2, wherein the testing process in second base station comprises detection and calculates the receive time delay that is caused by the signal propagation because of the distance from each base station to portable terminal.
4. according to each method among the claim 1-3, wherein the testing process in second base station comprises that portable terminal that detection is received by second base station sends the signal power of signal.
5. according to each method among the claim 1-4, wherein communication network is that a kind of cellular communication direct sequence spread spectrum codes is divided multiple access (DS-CDMA) system, by realize the longer time of integration these data being used to expand and increase the processing gain of receiver in the base station.
6. according to each method among the claim 1-5, wherein the position of portable terminal is determined by any or all method some following method from network system: (a) utilize the time delay that receives in each base station separately, (b) utilize direction and the time delay that (c) receives and/or the direction from first base station to portable terminal and the time delay that receives and/or the combination of the direction from second base station to portable terminal from each base station separately to portable terminal.
7. according to each method among the claim 1-6, the data that receive of at least the first base station this portable terminal in can the recognition network system wherein.
8. according to each method among the claim 1-7, the switching that wherein the portable terminal signal power that records is used for from first base station to second base station is prepared.
9. according to each method among the claim 1-8, wherein comprise the existence that detects detected data on first base station in the testing process on second base station.
10. according to each method among the claim 1-9, wherein the data that sent by portable terminal are unknown information datas.
11. according to each method among the claim 1-9, wherein the data that sent by portable terminal are a kind of predefined sequences.
12. the system of a detection signal in comprising a plurality of base stations and communications of Mobile Terminals net, wherein at least one base station is that first serving BS and this mobile radio station provide service by first serving BS in the given time; First serving BS can receive and detect by portable terminal and send to its data and can use these detected data to increase the detection probability to sent data by first serving BS and/or at least one second base station.
13. system according to claim 12, wherein the quality of signals that is received by first base station is enough for the detection that realizes the data that signal thus sends, send second base station that signal is not received by the enough power with abundant detection at portable terminal, comprise the device that utilizes these detected data to realize detecting data by second base station.
14. according to the system of claim 12 or 13, wherein second base station comprises and is used to detect and calculate the device of being propagated the receive time delay that causes because of the distance from each base station to portable terminal by signal.
15. according to each system among the claim 12-14, wherein second base station comprises and is used to detect the device that the portable terminal that is received by second base station sends the signal power of signal.
16. according to each system among the claim 12-15, wherein communication network is that a kind of cellular communication direct sequence spread spectrum codes is divided multiple access (DS-CDMA) system, comprises being used to utilize these data by realize expanding and increasing the longer time of integration device of the processing gain of receiver on the base station.
17. according to each system among the claim 12-16, comprise from network system by following any, some or all method is determined the device of mobile terminal locations: (a) utilize the time delay that receives on each base station separately, (b) utilize from each base station separately to the direction of portable terminal and (c) utilize time delay and/or the direction from first base station to portable terminal and the time delay that receives and/or the combination of direction that receives from second base station to portable terminal.
18., comprise the device of portable terminal in the data identification network system that utilization receives by at least the first base station according to the system of claim 12-17.
19., comprise that the signal power of utilizing the portable terminal that measures is for the device of doing to switch preparation from first base station to second base station according to the system of claim 12-18.
20. according to each system among the claim 12-19, wherein second base station comprises the device that is used to detect the existence of detected data on first base station.
21. according to each method among the claim 12-20, wherein the data that sent by portable terminal are unknown information datas.
22. according to each method among the claim 12-20, wherein the data that sent by portable terminal are a kind of predefined sequences.
23. as being described at this or the method for a kind of detection signal of with reference to the accompanying drawings any one embodiment.
24. as being described at this or the system of a kind of detection signal of with reference to the accompanying drawings any one embodiment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9726912.0A GB9726912D0 (en) | 1997-12-19 | 1997-12-19 | Apparatus and method for detection of signals |
| GB9726912.0 | 1997-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1285094A true CN1285094A (en) | 2001-02-21 |
Family
ID=10823938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98813711A Pending CN1285094A (en) | 1997-12-19 | 1998-12-17 | Apparatus and method for signal detection by base station in mobile communication system |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1038362A1 (en) |
| JP (1) | JP2001527316A (en) |
| KR (1) | KR20010033365A (en) |
| CN (1) | CN1285094A (en) |
| AU (1) | AU1677299A (en) |
| BR (1) | BR9813783A (en) |
| CA (1) | CA2315049A1 (en) |
| GB (1) | GB9726912D0 (en) |
| WO (1) | WO1999033196A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104471989A (en) * | 2013-06-14 | 2015-03-25 | 华为技术有限公司 | Cell Discovery Method And Device |
| CN110037621A (en) * | 2014-05-28 | 2019-07-23 | 三星电子株式会社 | Mobile device, clean robot and its control method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7110440B2 (en) | 2001-03-14 | 2006-09-19 | Mercury Computer Systems, Inc. | Wireless communications systems and methods for multiple processor based multiple user detection |
| JP3717805B2 (en) * | 2001-06-07 | 2005-11-16 | 三洋電機株式会社 | Mobile communication terminal |
| CN100464603C (en) * | 2005-06-16 | 2009-02-25 | 上海原动力通信科技有限公司 | Method for handover in digital cellular communication system using same-frequency netting |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440561A (en) * | 1991-09-30 | 1995-08-08 | Motorola, Inc. | Method for establishing frame synchronization within a TDMA communication system |
| US5267261A (en) * | 1992-03-05 | 1993-11-30 | Qualcomm Incorporated | Mobile station assisted soft handoff in a CDMA cellular communications system |
| US5926470A (en) * | 1996-05-22 | 1999-07-20 | Qualcomm Incorporated | Method and apparatus for providing diversity in hard handoff for a CDMA system |
-
1997
- 1997-12-19 GB GBGB9726912.0A patent/GB9726912D0/en not_active Ceased
-
1998
- 1998-12-17 KR KR1020007006832A patent/KR20010033365A/en not_active Application Discontinuation
- 1998-12-17 AU AU16772/99A patent/AU1677299A/en not_active Abandoned
- 1998-12-17 EP EP98961312A patent/EP1038362A1/en not_active Withdrawn
- 1998-12-17 BR BR9813783-2A patent/BR9813783A/en not_active IP Right Cessation
- 1998-12-17 WO PCT/GB1998/003810 patent/WO1999033196A1/en not_active Application Discontinuation
- 1998-12-17 CN CN98813711A patent/CN1285094A/en active Pending
- 1998-12-17 CA CA002315049A patent/CA2315049A1/en not_active Abandoned
- 1998-12-17 JP JP2000525987A patent/JP2001527316A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104471989A (en) * | 2013-06-14 | 2015-03-25 | 华为技术有限公司 | Cell Discovery Method And Device |
| US10278101B2 (en) | 2013-06-14 | 2019-04-30 | Huawei Technologies Co., Ltd. | Cell discovery method and apparatus |
| CN110037621A (en) * | 2014-05-28 | 2019-07-23 | 三星电子株式会社 | Mobile device, clean robot and its control method |
| CN110037621B (en) * | 2014-05-28 | 2021-12-14 | 三星电子株式会社 | Mobile device, cleaning robot and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| BR9813783A (en) | 2000-10-03 |
| EP1038362A1 (en) | 2000-09-27 |
| AU1677299A (en) | 1999-07-12 |
| WO1999033196A1 (en) | 1999-07-01 |
| CA2315049A1 (en) | 1999-07-01 |
| GB9726912D0 (en) | 1998-02-18 |
| JP2001527316A (en) | 2001-12-25 |
| KR20010033365A (en) | 2001-04-25 |
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