CN1337110A - Short range, low power communications system and method of operating the system - Google Patents
Short range, low power communications system and method of operating the system Download PDFInfo
- Publication number
- CN1337110A CN1337110A CN00802688A CN00802688A CN1337110A CN 1337110 A CN1337110 A CN 1337110A CN 00802688 A CN00802688 A CN 00802688A CN 00802688 A CN00802688 A CN 00802688A CN 1337110 A CN1337110 A CN 1337110A
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- China
- Prior art keywords
- spectrum allocation
- channel
- low power
- communications system
- packet
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
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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
- H04W52/02—Power saving arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A short range, low power communications system comprises a plurality of transceiving stations (RCM 1 TO RCM 4) capable of communicating in the ISM band, wherein a station wishing to transmit a data packet, transmits the data packet as a low bit rate, direct sequence spread spectrum (DSSS) signal in a spectrum allocation which is common to at least one geographical region and/or a plurality of countries. A carrier sense multiple access (CSMA) protocol may be used to enable the stations to access said spectrum allocation.
Description
Technical field
The present invention relates to the communication system of a short distance (normally maximum 50 meters), low-power (10mW), be used in particular for but be not exclusively used in the household radio electric control system, for example operate household electrical appliance and equipment with wireless remotecontrol, and short distance alternately, for example plays games and operates toy, and the method for operating this system.
Technical background
Many countries and regions in the world, the so-called ISM wave band about 2.4GHz is used for short haul connection.Usually the known system that is operated in the ISM wave band is direct sequence spread spectrum (DSSS) system and frequency-hopping spread-spectrum system.The DSSS system is generally used for providing the high bit-rate systems of 11Mb/s, and frequency-hopping system provides 1Mb/s usually.Yet area and country there are differences on rule and demand, this just requires product to produce or to be provided with at specific area and country, the result is exactly that product distributes and must strictly supervise, product can not be general, sometimes or even can not be general, this have brought inconvenience to the user in the neighboring countries in same area.
Disclosure of the Invention
One of target of the present invention provide one can be general the communication system at family and interactive application.
According to an aspect of the present invention, a kind of method of operating short distance, low power communications system is provided, system can be made up of in the emission receiving station of ISM band communication a plurality of, wherein, the base station of wishing the emission packet sends packet with the low bit speed rate Direct Sequence Spread Spectrum Signal in the spectrum allocation may identical at least one geographic area and/or a plurality of country.
According to a second aspect of the invention, a short distance low power communications system is provided, system is made up of a plurality of a plurality of emission receiving stations that communicate by letter at least one channel of ISM wave band, and wherein the base station is included in send the device of packet in the identical spectrum allocation may of at least one geographic area and/or a plurality of country with the low bit speed rate Direct Sequence Spread Spectrum Signal.
Second aspect of the present invention also provides a short distance low power communications system, system is made up of a plurality of a plurality of emission receiving stations that communicate by letter at least one channel of ISM wave band, the role of central controller is born in a described base station, wherein, each described base station all has a response to send the device of the transmission request of packet with the low bit speed rate Direct Sequence Spread Spectrum Signal in the spectrum allocation may identical at least one geographic area and/or a plurality of country.
Foundation system of the present invention does not need to cover the entire I SM wave band from 2.4 to 2.5GHz, can select one or more operating frequencies according to demand like this.In order to use as far as possible widely, Frequency Distribution often is selected in the part of ISM wave band, even this also is not to be identical for many countries for All Countries, and for example 2,446.5 to 2,475.0MHz.By using medium data transfer rate and the DSSS with limited spreading factor, spread-spectrum signal can satisfy described Frequency Distribution at an easy rate.And, can on transmission and coding gain, obtain robustness by using DSSS.
In a foundation embodiment of method and system of the present invention, the cell site adopts the described spectrum allocation may of carrier sense multiple access (CSMA) protocol access.
System by operation is made according to the present invention can obtain following potential income:
1. do not have the regional production marketing widely that changes, thereby simplified design, logistics, installation, and reduced cost.
2. the mobility used of equipment following its whilst on tour between country of Different Rule separately, does not need to reset all radio links.
3. possible general short-range communication channel not only is used for native system, also can be used for setting up other particular links (may be different with the difference in zone), for example, and the application of the more high bandwidth under the mode consistent with local rule.
Brief Description Of Drawings
Example explanation the present invention with reference to the accompanying drawings, wherein:
Fig. 1 is the theory diagram of radio lan (LAN), and
Fig. 2 is the schematic diagram that shows the frequency spectrum of ISM frequency band and several distribution.
Realize pattern of the present invention
Radio LAN shown in Figure 1 comprises a plurality of working equipment OD1, OD2, OD3, OD4 and a radio remote controller RC.In order to illustrate conveniently, working equipment OD1 comprises a television set, set-top box STB, video tape recorder VCR and people's computer PC one by one respectively to OD4.Working equipment OD1 further comprises a radio control module RCM1 respectively to RCM4 to OD4, makes working equipment become the member of the radio LAN that can be controlled by the user of operate wireless electric controller RC.
Radio controller RC comprises the keyboard 12 of people/machine (MMI) interface that a microcontroller 10, formation and microcontroller 10 are got in touch and the radio transceiver 14 of getting in touch with microcontroller.The power output of the radiating portion of transceiver 14 is 10mW magnitudes, and this has provided the horizon range of 50m.
Each radio control module RCM1 is roughly the same to RCM4, for simplicity, only describes radio control module RCM1 in detail.Antenna (or other radio signal transmission devices) 20 is connected to radio transceiver 22, and radio transceiver 22 can transmit and receive the DSSS signal on one or more narrow band channels of ISM wave band.Microcontroller 24 has and is connected to program ROM 26, is used to the I/O of storing the memory 28 of extended code and being used to store the memory 30 of packet.
Working equipment OD1 each in the OD4 between the emission of digital data packet be the single channel DSSS signal of low-power, low bit rate.Adopt carrier sense multiple access (CSMA) agreement to visit channel, wherein, the radio control module of wanting to launch is intercepted radio channel to confirm whether to have any activity on radio channel, and, if channel idle, the radio control module switches to emission state, sends packet.
For flexible operation, radio LAN is central controller independently not, but working equipment OD1 can be used as central controller CC at least some radio control modules of OD4.In order to quote conveniently, these working equipments are called main energy working equipment.For instance, assumed wireless electric control module RCM2 is used as central controller CC.Wish that television set is operably connected to VCR if having the user of radio remote controller RC, he selects VCR on remote controller RC, access channel, reflector sends to a DSSS signal S1 as the transceiver 22 among the remote control module RCM2 of central controller.Whether central controller checks, idle to check channel, and hypothesis is that transceiver has been launched DSSS link establishment signal S2 to working equipment OD1 and OD3.Radio control module RCM1 and RCM3 between have been set up wideband data exchange link WL, thereby image and voice data from VCR can be replicated on the television set.
The selection of the one or more radio channels that adopt according to communication system of the present invention is to consider existing Frequency Distribution in the ISM wave band and definite.
Fig. 2 has shown ISM wave band 40, the spectrum allocation may 42 of US and European (EUR), spectrum allocation may 44, the spectrum allocation may 46 of Spain (ES) and the spectrum allocation may 48 of Japan (JP) of France (FR).Ignore Japan and distribute 48, can see, enough overlapping several common signal channels that produce are arranged between other distribution 42,44 and 46, each is 3.3MHz.Along with Japan distributes 48 expansions downwards, will be by distributing 42,44 and 46 distribution 48 that enough same capabilities are provided, so that can allow the product of similar appointment work in the U.S., Europe, France, Spain and Japan with conceptive expansion.Even under existing regular situation, also can be adapted at 2,471MHz and 2, the channel between the 475MHz, this zone is the overlapping region between the top of the bottom of Japan's distribution 48 and Spain's distribution 46.
In order to reduce the interference of microwave oven, for important equipment with to use low section of frequency of utilization subband be more favourable.
Use is summarized as follows in the tabulation of the suggestion of the major parameter of the arrowband of ISM wave band DSSS radio communications system.Transmission on the channel begins according to the CSMA agreement.
| Parameter | Numerical value | Note |
| Frequency range | (2.4475-2.4735GHz 26Mhz bandwidth) | Employing is assigned to the same frequency of the ISM wave band in the U.S., (Japan) and the Europe |
| The spread-spectrum type | Direct sequence | Complexity is transferred to numeric field, allows fast synchronously, and only uses the part of 2.4GHz |
| Frequency channels | 4Mhz 6 channels at interval | Distribute a channel to be used for network registry |
| Sheet speed | 2.2M sheet/s | The main lobe bandwidth of reflector is 3.3MHz |
| Extended code | 11 Barker sequences | |
| Modulation | GFSK, modulation index 0.5 | Normal envelope |
| The gross bit rate of supporting | ?????????200kb/s |
Having under the situation of several frequency channels, can be preset task, for example registration and between working equipment, set up communication channel and distribute separately channel.
In this specification and claims, the existence of a plurality of such elements do not got rid of in the word " " before the element.And word " comprises " not getting rid of and has unlisted other elements or step.
By reading the present invention, other changes are conspicuous to those skilled in the art.These changes may relate to design, make and use known in low-power, short range communication systems and its parts, may be to substitute in this feature of having described or other features of outside these features, using.
Commercial Application
Short distance (typically until 50m), low-power (10mW) communication system are suitable for the application of family wireless electric control system.
Claims (10)
1. method of operating short distance, low power communications system, described system can be made up of in the emission receiving station of ISM band communication a plurality of, wherein, the base station of wishing the emission packet sends packet with the low bit speed rate Direct Sequence Spread Spectrum Signal in the spectrum allocation may identical at least one geographic area and/or a plurality of country.
2. the described method of claim 1 is characterized in that, the cell site uses carrier sense multiple access (CSMA) agreement and visits described spectrum allocation may.
3. claim 1 or 2 described methods is characterized in that described spectrum allocation may is positioned at 2,466.5 to 2, in the frequency band between the 475.0MHz.
4. claim 1,2 or 3 described methods is characterized in that, modulation is that modulation index is 0.5 Gaussian Frequency Shift Keying (GFSK).
5. the described method of any one claim in the claim 1 to 4 is characterized in that, sheet speed is 2.2M sheet/s, and extended code is 11 Barker sequences.
6. the described method of any one claim in the claim 1 to 5 is characterized in that spectrum allocation may comprises a plurality of channels, distributes at least one channel to be used to register purpose.
7. the described method of any one claim in the claim 1 to 5 is characterized in that spectrum allocation may comprises a plurality of channels, distributes at least one channel to be used for setting up communication channel between transmitting-receiving station.
8. short distance low power communications system, described system is made up of the emission receiving station of a plurality of at least one channel communication in the ISM wave band, and wherein the base station is included in send the device of packet in the identical spectrum allocation may of at least one geographic area and/or a plurality of country with the low bit speed rate Direct Sequence Spread Spectrum Signal.
9. short distance low power communications system, described system is made up of a plurality of a plurality of emission receiving stations that communicate by letter at least one channel of ISM wave band, the role of central controller is born in a described base station, wherein, each described base station all has a response to send the device of the transmission request of packet with the low bit speed rate Direct Sequence Spread Spectrum Signal in the spectrum allocation may identical at least one geographic area and/or a plurality of country.
10. claim 8 or 9 described communication systems is characterized in that, each transmitting-receiving station has the device that is used to adopt the described spectrum allocation may of carrier sense multiple access (CSMA) protocol access in response to the emission request.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9926832.8A GB9926832D0 (en) | 1999-11-12 | 1999-11-12 | A short range,low power communications system and a method of operating the sysem |
| GB9926832.8 | 1999-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1337110A true CN1337110A (en) | 2002-02-20 |
Family
ID=10864441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00802688A Pending CN1337110A (en) | 1999-11-12 | 2000-10-23 | Short range, low power communications system and method of operating the system |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1145502A1 (en) |
| JP (1) | JP2003515271A (en) |
| KR (1) | KR20010101495A (en) |
| CN (1) | CN1337110A (en) |
| GB (1) | GB9926832D0 (en) |
| WO (1) | WO2001037488A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100393057C (en) * | 2002-03-28 | 2008-06-04 | 西门子公司 | Adaptive modulation and other extensions of the physical layer in multiple access systems |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4812859B2 (en) * | 2009-06-12 | 2011-11-09 | 株式会社エヌ・ティ・ティ・ドコモ | Communication terminal and control method |
-
1999
- 1999-11-12 GB GBGB9926832.8A patent/GB9926832D0/en not_active Ceased
-
2000
- 2000-10-23 EP EP00975900A patent/EP1145502A1/en not_active Withdrawn
- 2000-10-23 CN CN00802688A patent/CN1337110A/en active Pending
- 2000-10-23 JP JP2001538335A patent/JP2003515271A/en active Pending
- 2000-10-23 WO PCT/EP2000/010439 patent/WO2001037488A1/en not_active Application Discontinuation
- 2000-10-23 KR KR1020017008831A patent/KR20010101495A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100393057C (en) * | 2002-03-28 | 2008-06-04 | 西门子公司 | Adaptive modulation and other extensions of the physical layer in multiple access systems |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1145502A1 (en) | 2001-10-17 |
| WO2001037488A1 (en) | 2001-05-25 |
| KR20010101495A (en) | 2001-11-14 |
| GB9926832D0 (en) | 2000-01-12 |
| JP2003515271A (en) | 2003-04-22 |
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