CN1918852A - Coexistence of multiple radio systems in unlicensed bands - Google Patents
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Abstract
A transceiver operates in a communication environment capable of including other transceivers, wherein the transceiver sends and receives traffic in accordance with a first communications standard, and other transceivers send and receive traffic in accordance with other communication standards that are incompatible with the first communications standard such that traffic sent in accordance with any of the first and other communications standards cannot be received by a receiver operating in accordance with any other one of the first and other communications standards. The transceiver identifies a carrier frequency for use as a shared broadcast channel that is accessible by the transceiver and by the other transceivers, and broadcasts information on the shared broadcast channel, wherein the information informs the other transceivers of the presence of the transceiver. The transceiver also receives information from the shared broadcast channel, wherein the information informs the transceiver of the presence of the other transceivers.
Description
The present invention relates to a kind of radio communications system.More specifically, the present invention relates in similar radio-frequency spectrum and/or the position operation of close a plurality of radio systems mutually on the geography.
When decades ago, the frequency spectrum rule is changed over permission in unauthorized frequency band, carry out commercial radio applications, but interest but is a spot of.And fundamentally changing this interest in the several years recently.After mobile phone in licensed band was succeedd in worldwide, capacity limit and huge license fee had stimulated the interest for the radio application in the unlicensed band.In several years in the past, in the 2.4GHz frequency band, developed gradually such as according to wireless lan (wlan) IEEE802.11 standard and Bluetooth
The communication system of standard operation.And, continuing to develop new communication system, such as ZigBee with according to IEEE802.15 those communication systems from the generation of wireless personal-area network (WPAN) tissue.
Even unauthorized radio-frequency spectrum also is limited.Even now uses some various criterions and ubiquitous communication simultaneously but can predict in the near future.Because various criterion is followed different agreements, therefore coexistence is not insignificant.And, consider that higher data speed often changes it and just aims to provide the fair rule of sharing, but still away from the demand of stalwartness.Use unauthorized frequency band that coexistence has been proposed challenge.In the design phase of the new communication system that must move in unlicensed band, the developer must design the unit of expectation and following shared frequency band:
Existing (incumbent) non-communication: for example the power of the such equipment radiation unconsciously of microwave oven will become interference source.
Existing communication: when not using any cooperation, for example as WLAN, Bluetooth
Or other communication systems of radio frequency identification (RF-ID) and so on to have a mind to that radiation also will experience be to disturb.
System in future: still do not exist still and will can cause serious disturbance in the system that be fabricated future.Unique known factor is limited these systems by rule.But, to discuss as former, rule changes along with the time, makes that prediction is quite unreliable.
Usually, the performance of communication system (that is to say packet error rate PER) is determined by seven variablees
PER＝H(P
u，B
u，R
u，d
u，P
j，B
j，d
j)
Here H is used for removing P
uOutside the monotonic increasing function of each parameter; For parameter P
u, H is the monotone decreasing function.In this formula, P
u, P
jBe respectively the expection with the jamming transmitter transmission power level; B
u, B
jBe respectively expection with disturb to send bandwidth; d
u, d
jBe respectively expection with disturb duty cycle.R
uIt is user information rate.Further, the quality of reception is the function of environmental factor, and described environmental factor is used for determining expection and last received signal intensity interference signal.Of paramount importance is the transmitter of expection and the distance between the receiver, and the distance between interference source and the receiver.Other effects also influence the propagation of signal in addition, such as blocking (shade), reflection, refraction and waveguiding effect or the like.If expection with disturb transmitter on identical frequency, to send simultaneously, so performance will depend on the expection experienced at receiver and interference power between signal-to-jamming ratio (S/I).The power level P of the transmitter of expection
uHigh more, jamming-proof protection is just big more, as long as the transmitter and the distance between the receiver of expection are not too big.Vice versa, and distance is short more, and the more strong cohesiveness that guarantees to overcome interference is collected mail number.Design more responsive receiver so that increase scope or the current trend that reduces required transmitted power do not produce any negative effect for the robustness of system.
Ratio B
u/ R
uBe the tolerance of system handles gain or coding gain; Lower information rate is considered more expense, so that disturb by signal extension or coding opposing.B
u, B
jBandwidth is wide more, and probability overlapping in frequency domain is high more.Increase the possibility that bandwidth has also reduced to avoid each other transmission in the frequency.Duty cycle d
u, d
jBig more, probability overlapping in time domain is also big more.Increase the possibility that duty cycle has also reduced to avoid each other transmission in the time.
Direct sequence is expanded or the interference mitigation of forward error correction coding is favourable by using, but because near-far problem is normally inadequate.That is, particularly in the ad-hoc environment, the interference transmitter can be very approaching with receiver.The power level that receives therefore can be enough strong so that the front end of receiver enters saturation condition, this has caused wave absorption.As the result of (putting on nonlinear effect) wave absorption, actual gain reduces (desensitization) and intermodulation product occurred.
Avoiding is the method that another kind alleviates interference.Avoid (CSMA/CA) and other standards to avoid in the application time by the carrier sense multiple access/conflict of using among listen before talk or the IEEE802.11.But this has proposed the solution of suboptimum, because the absolute power level of reflection is measured in conflict, and packet error rate (PER) depends on carrier wave-interference (C/I) ratio.
Provide in the frequency and avoid by frequency agility technology (selecting (DFS)) such as dynamic frequency.In this method, where systematic survey other transmitters in frequency band activate, thereby avoid these frequency bands.When potential interference continuously (for example on control channel) broadcast it when existing, this is good.But the measurement on bursty data channels causes insecure measurement.The jump of avoiding based on frequency provides and has alleviated method preferably.Because the expection signal and disturb between arge isolation, when jumping and disturbing when inconsistent, can obtain goodish robustness.But frequency hopping is just thought to work when interference is the arrowband; Equally, just think to disturb when having low duty cycle during jumping and work.The existing system that is arranged in unlicensed band is bandwidth restricted and seldom be duty cycle restricted normally, and this time-hopping systems to picture ultra broadband (UWB) impulse radio and so on has brought problem.
Along with the enhancing that unlicensed band is used, coexistence problems is also increasing.On the other hand, along with the demand (for example, in Voice ﹠ Video communication) of continuous increase, increase to some extent for the demand ratio of idle and clear channel for the special-purpose minimum quality of service grade of assurance in the past.Up to the present, non-cooperation technology has been discussed and has been solved this problem.In non-cooperation technology (for example CSMA, DFS and even spread spectrum), each system moves independently so that minimize the influence of interference that other system applies.On the other hand, to need system to intercom mutually so that find mutual interference be minimum best solution to cooperation technology.Use the transceiver of identical standard to intercom mutually, but when the transceiver considering to be designed to according to the different system operation, be not so just.
General introduction
Should be emphasized that when term " to comprise " when using in this manual, adopt the existence of these terminology states institute features set forth, integral body, step or assembly; But the existence or the interpolation of one or more other features, integral body, step, assembly or its combination are not got rid of in the use of these terms.
First transceiver is operated in the wireless communications environment that can comprise one or more other transceivers, wherein first transceiver sends and receives professional according to first communication standard, and the one or more transceivers in described one or more other transceivers according to and incompatible one or more other communication standards of first communication standard send and receive professional, thereby according to first and other communication standards in the business that sends of any one standard can not by according to first and other communication standards in the receiver of other any one standard operation receive.
In one aspect, the operation of first transceiver comprises the carrier frequency of identification as first transceiver and the addressable shared broadcast channel of one or more other transceivers; And on this shared broadcast channel broadcast message, wherein this information is notified the existence of one or more these first transceivers of other transceivers.
In one aspect of the method, this transceiver receives information from this shared broadcast channel, and wherein this information is notified the existence of first these one or more other transceivers of transceiver.
Each transceiver that receives this information can use its to come adaptive its operation, so that be reduced to/or the interference that comes other transceivers of operating in the comfortable described environment.
In aspect another, the discriminatory carrier frequency comprises that the predefined radio bands of scanning is to determine whether any one broadcast message on described shared broadcast channel in one or more other transceivers.
In certain embodiments, in response to neither one transceiver in definite other transceivers broadcast message on described shared broadcast channel, in predetermined radio bands, select frequency and set up shared broadcast channel.
In a further aspect, described information comprises following any one or its any combination:
First transceiver just is being used for the identifier of carrier frequency of transport service;
The identifier of the positive occupied bandwidth of first transceiver;
The identifier of the duty cycle that first transceiver is operated on radio-frequency spectrum;
The identifier of the transmission power level that first transceiver is using;
At the identifier of sharing the cycle of broadcast message on the broadcast channel;
Very first time point is with respect to the identifier of another time point, and this very first time point is the time point of broadcasting this information on the broadcast channel sharing;
The identifier of the spreading factor that first transceiver is using;
The identifier of the spreading code that first transceiver is using and
The identifier of the first transceiver feature, this feature make one or more other transceivers can adjust operation to realize reducing the interference with this first transceiver.
In one aspect of the method, comprise by using first signaling format (signaling format) sharing broadcast message on the broadcast channel and broadcasting first segmentation on described shared broadcast channel in broadcast message on the shared broadcast channel; And by using broadcasting second segmentation on described shared broadcast channel sharing broadcast message on the broadcast channel of second signaling format, wherein first signaling format is different from second signaling format.This aspect is favourable when the enough general character between the various signaling formats that for example can not find various criterion, so that all transceivers can be received in the single format signal of sharing the information of transmitting on the broadcast channel.
In the embodiment that replaces, share broadcast message on the broadcast channel comprise use first and the signaling format that uses all of other transceivers come sharing on the broadcast channel broadcast message and receive information from this shared broadcast channel.
In other replacement, comprise that in broadcast message on the shared broadcast channel approximate (approximate) passes through the approximate signaling format of all first and other transceivers with broadcast message on shared broadcast channel with from this shared broadcast channel reception information.
In another alternative embodiment, broadcast message comprises use Continuous Phase Modulation (CPM) signaling format on the broadcast channel sharing, the CPM modulation index that this form had greater than first and other communication standards in one of any employed maximum CPM modulation index, and its symbol time that has greater than first and other communication standards in one of any employed long symbol time.In certain embodiments, the CPM signaling format can be the Continuous phase frequency shift keying signaling format.
In the part embodiment of these embodiment, approximate continuous phase modulated (CPM) signaling format comprises, for each information bit that is included in the information that on sharing broadcast channel, to broadcast, replace corresponding symbol sebolic addressing, the CPM modulation index that wherein this signaling format had is greater than first and one of any employed maximum CPM modulation index of other communication standards, and its symbol time that has is greater than first and one of any employed long symbol time of other communication standards; And each corresponding symbol sebolic addressing offered data transmitter unit according to first communication standard operation.In finishing some embodiment of above operation, described data transmitter unit comprises that generation will be sent out the delta-demodulators of signal waveform.
In aspect another, described first transceiver is operated in first frequency band, and wherein at least one transceiver of other transceivers is operated in nearby frequency bands.In these embodiments, described shared broadcast channel can be positioned at this nearby frequency bands.
Description of drawings
Will be understood that objects and advantages of the present invention by the detailed description of reading below in conjunction with accompanying drawing, wherein:
Fig. 1 has described and has been included in the following home environment that carries out radio communication in the 2.4GHz frequency band.
Fig. 2 example in the 2.4GHz frequency band figure of schematic following home environment disturbed condition.
Fig. 3 is the sequential chart of schematic use of the shared Broadcast Control Channel (SBCH) of three systems of hypothesis (A, B and C).
Fig. 4 is the schematic diagram that SBCH goes up the exemplary packet format of single message.
Fig. 5 a is the block diagram according to the exemplary dual-radio system of an embodiment.
Fig. 5 b is the block diagram according to the exemplary radio system of alternative embodiment.
Fig. 6 is the form that is listed as the exemplary system characteristic of 2.4GHz frequency band imagination.
Fig. 7 is the phase trellis diagram with binary system CPFSK signal of CPM modulation index h=1.
Fig. 8 a is the phase diagram that utilizes the exemplary narrowband CPM signal of required phase locus generation.
Fig. 8 b utilizes Bluetooth
The phase diagram of the exemplary narrowband CPM signal that the phase locus that transmitter is set up produces.
Fig. 8 c is the phase diagram of the exemplary narrowband CPM signal that produces of the phase locus of utilizing WLAN 802.11b transmitter to set up.
Fig. 8 d is the phase diagram of the exemplary narrowband CPM signal that produces according to the phase locus that alternative embodiment utilizes WLAN 802.11g transmitter to set up.
Fig. 9 is according to the exemplary transmitter of alternative embodiment and the block diagram of receiver structure.
Figure 10 is intended to be used for the high level flow chart of exemplary operations performed in any transceiver that the environment with other incompatible transceivers is operated.
Describe in detail
Describe each feature of the present invention referring now to accompanying drawing, wherein similarly part is represented with identical Reference numeral.
To various aspects of the present invention be described in more detail in conjunction with a large amount of illustrative examples now.For the ease of understanding the present invention, many aspects of the present invention are described according to the performed sequence of movement in the unit of computer system.Will be understood that in each embodiment each action can be passed through special circuit (for example, the separation logic door of interconnection is to carry out special function), carry out by the program command of one or more processors execution or the combination of the two.And, can consider in addition that the present invention is at any type of computer-readable medium that comprises suitable computer instruction set, such as intactly enforcement in solid-state memory, disk, CD or the carrier wave (such as radio frequency, audio frequency or optical frequency carrier wave), these computer instructions will make processor carry out technology described herein.Therefore, various aspects of the present invention can be implemented with many different forms, and all these forms is all expected and is located within the scope of the present invention.For each aspect of various aspects of the present invention, the embodiment of any this form can be called the action that " being used for by logic configured " execution is described here, perhaps alternatively is called the action that " logical circuit is used for " execution is described.
Disclosed herein is cooperation technology can be used by the Wireless Telecom Equipment according to the various criterion operation.These technology allow according to the coexistence simultaneously in identical geographic area in identical frequency spectrum of various criterion operated system.
Described shared Broadcast Control Channel is used by the different transmitters of sharing same frequency spectrum, exists reciprocally to notify it.In the time division multiplexing mode, described transmitter is being shared transmission grouping on the Broadcast Control Channel, so that disclosing its frequency spectrum use aspect carrier frequency, bandwidth, duration and/or the duty cycle.Employed in certain embodiments signaling format satisfies two requirements: it can produce by the conventional transmitters that is designed for each various criterion, and it can receive by the traditional receiver that is designed for each various criterion.In alternative embodiment, described grouping can comprise the plurality of segments that has at the different signaling formats of different receivers type.When introducing can not be handled the new system of current signaling format, can add new packet segmentation to adapt to new signaling format.Usually might only utilize software or hardware change in the existing transceiver to realize technology described herein.Can use the hardware of standard.In certain embodiments, signaling format uses arrowband, Continuous Phase Modulation (CPM) technology.Now these and other aspects and embodiment will be described in more detail.
In 1984/1985 time range in the past, the system that the wireless access that is provided to ethernet backplane is used for office application is developed in beginning first.This WLAN (WLAN (wireless local area network)) system is called WiFi on the market now, has become instrument commercial and that private user enjoys a lot because it provide fast and in some cases with free mode in wireless surfing on the internet.Equipped that WLAN PCMCIA (or built-in) blocks and the kneetop computer that is positioned at WLAN access point scope is enough to be connected to office network.The standard that this system uses is the part of the WLAN802.11 family of exploitation in the IEEE tissue.Now, there are 802.11 systems of different editions, including, but not limited to 802.11b and 802.11g.These expansions provide higher data rate.
In 1994, the system that wireless connections between the portable set are provided was at first developed in beginning.This wireless personal-area network (WPAN) system is called Bluetooth on the market now
, become and wanted the instrument that the user liked that its mobile phone and headset, PDA(Personal Digital Assistant), kneetop computer or the like are interconnected.Bluetooth
Technology is by Bluetooth
Special interest group standardization.And at Bluetooth
In the critical field, developing and have the more some versions of high data rate.WLAN 802.11 technology and Bluetooth
General character between the technology is their all scope of application 2.4GHz industrial science medical treatment (ISM) frequency bands from 2400MHz to 2483.5MHz.This frequency band is that the whole world can be used and uses without any need for permission for it.Therefore, it be actually the whole world, free band.This has stimulated other people a large amount of generations to be used for the new communication system of this frequency band.For example, in the 802.15.3 group, in the IEEE scope, developing a large amount of two-forty WPAN standards.The Gesellschaft that is called WiMedia initiates the application of these standards aspect two-forty, multimedia.Yet another example is the low rate WPAN standard of exploitation in IEEE 802.15.4 group.This standard is initiated by the Gesellschaft that is called ZigBee, and its target is sensing system, industrial automation and toy.In addition, other system is just working in 2.4GHz ISM frequency band, such as RF-ID, cordless telephone (for example, individual radio technology or " PWT ", standard is that the numeral of the U.S. strengthens cordless telecommunication (DECT) modification) and wireless local loop (" WLL "-in IEEE 802.16a group standardization and initiate by WiMax alliance).
Will be appreciated that all these systems need share just is higher than the wide identical 2.4GHz ISM frequency band of 80MHz a little.In addition, prediction high data rate and assurance minimum quality of service (QoS).In 2003, the Bluetooth that the quantity of the WLAN unit of shipment is loaded and transported near 3,000 ten thousand
The quantity of unit surpasses 6,000 5 hundred ten thousand.Very clear when considering new system, but in some zone desired frequency band compression, because the unit of enormous quantity needs capacity.
Fig. 1 shows an example, and Fig. 1 has described the following home environment 101 that is included in radio communication in the 2.4GHz frequency band.At this environment, in the kitchen, the kneetop computer 103 that is positioned on the sales counter keeps radio contact via WiFi and home network 105, so that the menu of visit central database (for example, the PC-of family is not shown).Kneetop computer 101 has the use wireless Bluetooth
The wireless mouse 107 of technology.Smoke detector 109 in the kitchen constantly sends signal to indoor central authorities' control hub (not shown) via the ZigBee technology.Children with also play by his automobile 11 of wireless controller 113 remote controls via the ZigBee technology.RF-ID unit 115 is put into and is taken out to follow the tracks of article near being positioned at refrigerator 117.At last, microwave oven 119 is in the operation of heat food.
Fig. 2 example based on the environment of describing among Fig. 1 101, the figure of schematic following home environment disturbed condition in the 2.4GHz frequency band.Particularly, show the power spectrum of different system.Exist 201,203: channel of two ZigBee channels to be used for remote control toy car 111, one other channel is used for smoke detector 109.Most frequency spectrums are static and concentrate on around the fixed carrier.Bluetooth
Technology 205 is frequency hoppings.Microwave signal 207 is swung switching on and off between tour of primary period.Mutual interference influences the relative distance between activity (when the unit is in " unlatching " state), transmission power level and the transmitter and the receiver that will depend in the time domain.Bluetooth
Technology is now by using AFH (AFH) to have the mode of avoiding WLAN and other system.But AFH is non-cooperation technology, and its performance depends on Bluetooth
System detects the good degree of WLAN.When the quantity of autonomous system increased, non-cooperation technology was not enough, operation even can become unstable when system works mutually in uncontrollable mode.
So, in the disclosure, propose to use the cooperation technology of sharing Broadcast Control Channel (SBCH) now.SBCH is the narrow band channel that can be placed on any position in the frequency spectrum, but in case in specific frequency foundation (for example, the frequency of Dynamic Selection), it just preferably remains on this identical frequency.SBCH is characterised in that and allows each system described signal be worked.For example, as shown in the sequential chart of Fig. 3, each system is broadcast on SBCH successively.Be designated three kinds of systems of A, B, C in Fig. 3, each system broadcast message is such as the message 301 of the A of system.Each message comprises the feature of its corresponding system.These features comprise with the relevant information of other system to be avoided or reduces at least disturbing to help these other systems to adjust its oneself operation.The example of these features is: the employed spreading factor of its professional carrier frequency, the bandwidth that takies, duty cycle, transmission power level, use, the spreading code of use or the like of being used for of system.It can even be included in the cycle and the phase place of the broadcast that SBCH go up to send, thereby wants to use the transmission of the other system of this SBCH can not conflict.(in this specific context, term " phase place " is used in reference to a time point certain designator with respect to another time point.)
The cycle of broadcast can considerablely change.For example, it can be designed to from less than 1 second scope to some minutes.If the power consumption of this unit of expectation minimization can be used the long time cycle.Began before sending on the SBCH at a unit, its scans I SM frequency band is to check whether SBCH exists.If like this, it will not use same SBCH carrier wave and insert its message when having other broadcast transmissions.If there is no SBCH, it will be searched for suitable frequency (preferably experiencing the seldom frequency of background noise) and set up new SBCH.In Fig. 3, three A of system, the B, the C that have couple SBCH to work.Described unit can use different standards or wherein a part can use identical standard.Technology described herein can also be applied to all and use identical standard but the system of independent operating (promptly with non-coordination mode).Described broadcast can send with the fixing cycle, and perhaps unit can at first be intercepted till receiving message and additional then its oneself message.If realize broadcasting, may implement the contention solution in this ad-hoc mode.For easy enforcement, described broadcast can be designed to aim at (or the integral multiple in cycle) all transmitters that use same period.The example of Fig. 3 also example send the unit B of broadcast with the duty cycle lower than the duty cycle of transmitter A and C.But, still aim at this transmission, this means that they take place with identical order and timing respect to one another when sending, as shown in this Fig.
It shown in Fig. 4 the exemplary packet format of message.At first provide the preamble 401 that is used to train with the known bits sequence of synchronization message receiver.These technology are known in radio communication, do not need here to describe in detail.
On the other hand, if other system (for example, system B in this example and C) uses the standard in no case have any general character, the message broadcasted of the A of system can comprise two segmentation X and Y so, and each segmentation is exclusively used in the receiver of particular type.In different segmentation X and Y, repeat the identical information content but use different signaling formats.Therefore in the example of Fig. 4, segmentation X comprises and is merely able to the information that read by the B of system, and segmentation Y comprises and is merely able to the information that read by the C of system.
Now signaling format will be described in more detail.On the principle, the form that is preferably expectation satisfies two requirements:
It should be able to produce by the transmitter according to every kind of standard design; With
It should be able to be decoded by the receiver according to every kind of standard design.
The direct method that realizes this is a kind of standard of selection and implements in every kind of system.For example, can be with Bluetooth
Transceiver is placed in any equipment with communication system of moving in 2.4GHz ISM frequency band.This causes having produced the dual radio equipment of the example of giving in Fig. 5 a.Exemplary device 501 is intended to as WiFi equipment according to IEEE 803.11b standard operation.Therefore, equipment 501 comprises 802.11b transceiver 503.But, in order to make this equipment operating on the SBCH as described herein, equipment 501 is designed to also comprise Bluetooth in this example
Transceiver 505.For the efficient that designs, 802.11b transceiver 503 and Bluetooth
Transceiver 505 is shared community antenna 507.
Complete Bluetooth
The price level of wireless device reaches and is lower than 2.50 dollars, therefore the product of wherein placing them has been increased some costs.Alternatively, the Bluetooth that takes apart
Wireless device can cover in the equipment 501, because it only needs to send and receive simple message on SBCH, has therefore further reduced price.The designer is depended in this selection: Bluetooth
Radio will mainly need be used for treatment S BCH signal (send and receive), but also can be used in traditional Bluetooth certainly
Use.
Also provide SBCH controller 509 to be used for transmitting information and control 802.11b transceiver 503 and Bluetooth according to principle described herein
The operation of transceiver 505.Interface 511 between SBCH controller 509 and the 802.11b transceiver 503, SBCH controller 509 and Bluetooth
Interface 513 between the transceiver 505 transmits state information and other controller informations and the signal that the relevant other system that is received uses the ISM frequency band.Main wireless device can use any known interference reduction/avoidance strategy correspondingly to move then.On the contrary, main wireless device (for example, the 802.11b transceiver 503 in Fig. 5 a example) can be Bluetooth via SBCH controller 509
Wireless device provides the information that will broadcast on SBCH.
Be intended to according to Bluetooth at transceiver
Standard is transmitted under the situation of its regular traffic, may use the exemplary device of describing in the block diagram of Fig. 5 b 551.Here, provide the bluetootho transceiver 553 that is connected with antenna 557 to be used for dual purpose: according to Bluetooth
The standard transport service also joins among the SBCH according to principle described herein.In order to control Bluetooth
Transceiver provides SBCH controller 559 about the operation of SBCH.Based on Bluetooth
Transceiver 553 offers the information of SBCH controller 559 via control and data link 561, and SBCH controller 559 can make Bluetooth
Transceiver 553 is taken steps to avoid and is disturbed as producing by detected other equipment of SBCH.
Certainly, in above discussion, select Bluetooth
Technology is used for communicating by letter on SBCH as just an example; Can alternatively use transceiver according to other standard operations.
The signaling format of giving provisioning request before use satisfying will be described now and the alternative embodiment of needs additional radio transceiver not.In order to achieve this end, should find all transmitters that in various criterion, use and the least common denominator of receiver.At first, consider the bandwidth of this signaling format.Broadband receiver can receiving wide-band signal and narrow band signal.By contrast, narrow-band receiver is merely able to receive narrow band signal.Therefore, described signaling format should be the arrowband to allow arrowband and the broadband receiver described message of all decoding.The arrowband signaling is with restricted information speed, but this is not serious problem, because the amount of information that will transmit on SBCH little (for example, tens bytes).
Consider now in described signaling format the modulation type that uses.Frequency carrier can be modulated with amplitude and/or phase place.Many standards for example define Bluetooth
Those standards of technology are only used phase modulated.Described receiver according to these standard operations is equipped with the hard limiter that removes any amplitude information continually.So this signaling should the modulation of application phase (or frequency modulation(FM), this is considered to a kind of form of phase modulated).
The table that Fig. 6 describes has shown the tabulation of the schematic different system of using 2.4GHz ISM frequency band.This table also shows the signaling feature that its system uses.For the 802.11g technology, only mention the QPSK modulation.Also support other modulation schemes as 16-QAM and 64-QAM, but they are less interested, because in these modulation schemes, have range weight.
In following schematic embodiment, the signaling format that is used on SBCH, transmitting that will use Continuous Phase Modulation (CPM) can produce and decode as each system.In CPM, only in phase place, carry described information.In addition, this phase place changes smoothly.The very simple form of CPM is binary system Continuous phase frequency shift keying (CPFSK), wherein phase place in very simple mode in each sign change:
Δφ
k＝π·h·b
k
Here h is CPM modulation index and b
kIt is information bit (1 or-1).The meaning of term " CPM modulation index " is the value that is illustrated in maximum phase rotation on the symbol time.In order to obtain more background informations of relevant this type modulation, referring to Proakis, " DigitalCommunications ", the 2nd edition, McGraw-Hill, 1989 (ISBN 0-07-100269-3).For the essence of example modulation signal, the binary system CPFSK signal phase grid of h=1 has been shown among Fig. 7.Can find out and utilize each new symbol, according to the symbol that will send be+1 or-1, change the phase place of signal by the π that adds deduct.
(shaping) modulation format in Fig. 6 tabulation is all relevant with the CPM form.At Bluetooth
The Gaussian Frequency Shift Keying of using in the technology (GFSK) modulation can be thought the CPFSK of modulation index h between 0.28 and 0.35.Least displacement keying (MSK) is used in the modulation of IEEE 802.15.4 technology, and it is the CPFSK of h=0.5.And, 802.11 technology and Bluetooth
All the CPFSK with h=0.5 is relevant for the employed Quadrature Phase Shift Keying of more advanced versions (QPSK) scheme of technology.
The SBCH signaling must be by using different modulating index h and distinct symbols time T
sSystem produce.So the modulation index h that the SBCH signaling has should be far longer than the maximum h that any standard is used
MaxIn addition, the SBCH signaling should be used symbol time T
s, the long symbol time T that it is far longer than that any standard uses
S_maxIn the above example that provides, h
Max=0.5 and T
S_max=4 μ s.Only, then, select modulation index h=4 and select the symbol time T for SBCH as an example
s=17 μ s.Because the latter's symbol time is restricted to 59kb/s with information rate.
Fig. 8 a is that { 1 ,-1, the schematic phase locus that-1} produces is supposed the h=4 and the T that as above select from the bit sequence that sends at SCBH
s=17 μ s.In the figure, can find out that phase place increases by 4 π with expression+1 on first 17 μ s; On next 17 μ s, reduce 4 π with expression-1; And on the 3rd 17 μ s interval, represent the next one-1 value by reducing another 4 π.Be desirably in each system that will on SBCH, communicate by letter and send and to receive this signal (or its best approximation) at least.Particularly, have in the undesired generation of given transceiver circuitry or reception under the situation of the signal that is selected at the modulation index used on the SBCH and symbol time, the transmitter circuit of this transceiver promptly produces the signal that is similar to the expectation waveform in such a way and operates.Similarly, the non-compatible circuit of use transceiver oneself is carried out the reception of another transceiver SBCH signal, and the output of transceiver is handled promptly in such a way can extract the information that received signal is transmitted.
For example this, in Fig. 8 b, 8c and 8d, illustrated and passed through Bluetooth respectively
The phase locus that transmitter, WLAN 802.11b transmitter and WLAN 802.11g transmitter are set up.Modular system is followed the tracks of the CPM phase waveform via delta modulation techniques, wherein keeps deviation as small as possible for each step-length.Determine time step by symbol time in every kind of standard, h determines phase step by modulation index.Therefore for Bluetooth
Technology, time step are T
S Bluetooth=1 μ s, and phase step is h π=0.3 π.For WLAN 802.11b technology, suppose that this technology also supports old IEEE 802.11 standards, its direct sequence spread spectrum scheme is that 11M chip/s and data rate are 1 and 2Mb/s.Payload is used higher data rate 5.5Mb/s and 11Mb/s 802.11b the header of grouping is with the modulation rate operation of 1Mb/s.If turn off the Barker sequence spread spectrum, can use 2Mb/s QPSK scheme, this makes T
S_802.11b=0.5 μ s and h π=pi/2.For the 802.11g technology, conventional letter duration 4 μ s (comprising the cycle prefix) and QPSK (h=0.5).
Provide these different modulation signatures in different equipment, { 1 1-1 11 1...-1-1-1 1} (supposes Bluetooth by using symbol sequence in the A of system
Technology); { 1-1 1-1 1 1-1...-1, the 1-1} (supposing WLAN 802.11b technology) of using symbol sequence in the B of system, and in the C of system the using symbol sequence { 1111 1...-1-1-1} (supposing the WLAN802.11g technology) are similar to the data sequence { 1 among the CPM,-1 ,-1} (character rate with approximate 29kb/s sends and example in Fig. 8 a).
As shown in Fig. 8 b, 8c and the 8d,, can be similar to the arrowband CPM signal of expectation by in standard transmitters, sending suitable symbol string.Fig. 9 is the block diagram that is used to realize this approximate exemplary hardware components device.In transmitter one side, provide suitable symbol string to delta-demodulators 901, the output of this demodulator is fed to transmitter 903 then.The modulated signal that is positioned at transmitter 903 outputs is provided for channel via antenna 905.For every kind of standard, can find correct symbol sebolic addressing.In illustrative examples, can in memory device, store each symbol sebolic addressing of being used for given standard (corresponding to+1, corresponding to-1) and can obtain them again when needing with box lunch.
In receiver one side, carry out reverse operating.Antenna 907 received signals also offer this signal the reference receiver 909 that recovers phase of received signal.This afterwards information is provided for the delta modulator 911 that therefrom produces value of symbol.This digital signal of low-pass filtering (not shown) will provide the broadcast message of expectation then.
How Fig. 9 only produces and follows the tracks of phase in conceptive demonstration.In existing techniques in realizing, I and Q input and output can exist, and this has eliminated the demand for clear and definite delta-demodulators and delta modulator.That is, will not need plural receiver mapping input signal to the phase signal by delta modulator then; On the contrary, all processing of complex signal will be carried out in plural number (I/Q) territory.
Be to have such system the most easily, wherein the broadcast that sends on SBCH of each transmitter only is made of the single split of using the CPM signaling.But, the CPM signaling that the new system of the following exploitation of expection can not decode and be suitable for all current standards at present.In order to adapt to the existence of the new system of any of these, can realize such embodiment, wherein increase new segmentation as shown in FIG. 4, this new segmentation is in particular the described new system generation that has previously in the different signaling format of the signaling format of the last use of SBCH.
Figure 10 is the high level flow chart of the exemplary operations carried out in any transceiver, and the environment that this transceiver is intended to be used for having other non-compatible transceivers is operated, and initial treatment relates to identification SBCH (step 1001).As described in previously, this identification can relate to the available frequency band of scanning to determine whether to set up SBCH (for example, just having realized broadcasting by detecting one or more other transceivers on it).If detect a SBCH, use it then.If do not detect any SBCH, transceiver just can be set up its oneself SBCH by the carrier frequency of selecting to use.
Schematically transceiver is periodically broadcasted its (step 1003) for information about then on described SBCH.This makes other transceivers can detect the existence of this exemplary transceiver, and uses adaptive its oneself the operation of this information to avoid the interference with this exemplary transceiver.
Schematically transceiver also receives the information (step 1005) that other transceivers are broadcasted on SBCH.Schematically thereby transceiver can use adaptive its operation of this reception information to avoid interference (step S1007) with other transceivers.How and/or when this adaptive this schematic transceiver that can comprise sends information.Thisly adaptively can replace or comprise additionally how and/or when this schematic transceiver will receive professional from its predetermined source.
Various technology described above is not limited to the application in a plurality of systems of sharing the same radio frequency spectrum.On the contrary, these technology can also be with nearby frequency bands operation but still use in the system of phase mutual interference.Can find an example, new Universal Mobile Telecommunications System (UMTS) band envisioned is positioned at the frequency band of scope from 2500MHz to 2690MHz.This is just above the 2.4GHz ISM frequency band of the scope from 2400MHz to 2483.5MHz.But, when two wireless devices lean on mutually very near the time, for example have built-in Bluetooth
Wireless UMTS phone, near-far problem make one of them wireless device shut-down operation.Saturated (wave absorption) that this can be produced owing to the high transmitted power of other wireless devices by the receiver of one of them wireless device is perhaps because the pectrum noise level increases and raising intrinsic noise level causes.
In order to eliminate this problem, the UMTS wireless device can for example promote that SBCH notifies its existence.That is, the UMTS wireless device is positioned at transmission in the signal of 2.4GHz frequency band, discloses it and communicates by letter in the 2.5GHz frequency band.The unit of in the 2.4GHz frequency band, operating then can by with its signal framing the IsM frequency band than lower part in or respond by suppressing all communications together.
In unauthorized 2.4GHz ISM frequency band, set up the mandatory rule of system.In the U.S., this rule is FCC part 15 rules that system must observe; In Europe, in ETSI file ETS 300-328, these rules have been described.Power level for being higher than 0dBm needs signal extension.If necessary, will produce the chip of symbol shown in Fig. 8 a, can use additional code or spread spectrum the CPM signaling of SBCH as frequency expansion sequence by considering.To further reduce information rate then.
In addition, responsible institution (such as U.S. FCC) regulation is for the restriction of the maximum average power level of single transmitter.The mean output power level of each transceiver has low-down duty cycle is used for sending message on SBCH each transceiver so can rely on, because will be low.Can observe when some transmitters on SBCH during their message of cascade, the average power level on the channel rises and maximum level that may overshoot; But this does not violate the rules, because these regulations are responsible for the operation of having only a transmitter, rather than the combined effect of a plurality of transmitters on shared channel.
The present invention has been described with reference to specific embodiment.But, will it is evident that for the person of ordinary skill of the art, might implement the present invention with other concrete forms except that the foregoing description.Described embodiment only is restriction exemplary and that should not be regarded as any way.Scope of the present invention provides by claims, rather than description before, and all modification and the equivalent that fall in the claim protection range all are intended to comprise in the present invention.
Claims (51)
1, a kind of method of in the wireless communications environment that can comprise one or more other transceivers, operating first transceiver, wherein this first transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in described one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to first and other communication standards in the business that sends of any one standard can not by according to first and other communication standards in the receiver of other any one standard operation receive, this method comprises:
Identification is as the carrier frequency of first transceiver and the addressable shared broadcast channel of one or more other transceivers; With
Broadcast message on this shared broadcast channel, wherein this information is notified the existence of one or more these first transceivers of other transceivers.
2, method according to claim 1, wherein the discriminatory carrier frequency comprises:
The predetermined radio bands of scanning is to determine whether any one transceiver broadcast message on described shared broadcast channel in one or more other transceivers.
3, method according to claim 2 comprises:
In response to neither one transceiver in definite other transceivers broadcast message on described shared broadcast channel, in predetermined radio bands, select frequency and set up shared broadcast channel.
4, method according to claim 1, wherein said information comprise that first transceiver just is being used for the identifier of carrier frequency of transport service.
5, method according to claim 1, wherein said information comprises the identifier of the positive occupied bandwidth of first transceiver.
6, method according to claim 1, wherein said information comprises the identifier of the duty cycle that first transceiver is operated on radio-frequency spectrum.
7, method according to claim 1, wherein said information comprises the identifier of the transmission power level that first transceiver is just using.
8, method according to claim 1, wherein said information are included in the identifier of sharing the cycle of this information of broadcasting on the broadcast channel.
9, method according to claim 1, wherein said information comprise the identifier of very first time point with respect to another time point, and this very first time point is the time point of broadcasting this information on the broadcast channel sharing.
10, method according to claim 1, wherein said information comprises the identifier of the spreading factor that first transceiver is using.
11, method according to claim 1, wherein said information comprises the identifier of the spreading code that first transceiver is using.
12, method according to claim 1, wherein said information comprises the identifier of the first transceiver feature, this feature makes one or more other transceivers can adjust operation to realize the interference of minimizing and this first transceiver.
13, method according to claim 1, wherein broadcast message comprises on shared broadcast channel:
By using broadcasting first segmentation on described shared broadcast channel of first signaling format sharing broadcast message on the broadcast channel; With
By using broadcasting second segmentation on described shared broadcast channel of second signaling format sharing broadcast message on the broadcast channel,
Wherein said first signaling format is different from described second signaling format.
14, method according to claim 1, wherein broadcast message comprises on shared broadcast channel:
Use first and the signaling format that uses all of other transceivers sharing on the broadcast channel broadcast message and receiving information from this shared broadcast channel.
15, method according to claim 1, wherein broadcast message comprises on shared broadcast channel:
The approximate signaling format that is similar to by all first and other transceivers receives information with broadcast message on shared broadcast channel with from this shared broadcast channel.
16, method according to claim 1, wherein broadcast message comprises on shared broadcast channel:
Approximate continuous phase modulated (CPM) signaling format, the CPM modulation index that this form has greater than first and other communication standards in the employed maximum CPM modulation index of any standard, and its symbol time that has greater than first and other communication standards in the employed long symbol time of any standard.
17, method according to claim 16, approximate continuous phase modulated (CPM) signaling format wherein, the CPM modulation index that this form has greater than first and other communication standards in the employed maximum CPM modulation index of any standard, its symbol time that has greater than first and other communication standards in the employed long symbol time of any standard, this approximate comprising:
For each information bit that is included in the information that on sharing broadcast channel, to broadcast, replace corresponding symbol sebolic addressing; With
Each corresponding symbol sebolic addressing is offered the data transmitter unit of operating according to first communication standard.
18, method according to claim 17, wherein said data transmitter unit comprise that generation will be sent out the delta-demodulators of signal waveform.
19, method according to claim 16, wherein the CPM signaling format is the Continuous phase frequency shift keying signaling format.
20, method according to claim 1, wherein said first transceiver is operated in first frequency band, and at least one other transceiver is operated in nearby frequency bands.
21, method according to claim 20, wherein said shared broadcast channel is positioned at this nearby frequency bands.
22, a kind of method of in the wireless communications environment that can comprise one or more other transceivers, operating first transceiver, wherein this first transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in described one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to first and other communication standards in the business that sends of any one standard can not by according to first and other communication standards in the receiver of other any one standard operation receive, this method comprises:
Identification is as the carrier frequency of first transceiver and the addressable shared broadcast channel of one or more other transceivers; With
Receive information from this shared broadcast channel, wherein this information is notified the existence of first these one or more other transceivers of transceiver.
23, method according to claim 22 comprises:
In response to receiving first transceiver information that these one or more other transceivers exist of notifying, the operation of adaptive first transceiver is so that be reduced to and/or from the interference of one or more other transceivers.
24, a kind of transceiver that in the wireless communications environment that can comprise one or more other transceivers, uses, wherein this transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to first and other communication standards in the business that sends of any one standard can not by according to first and other communication standards in the receiver of other any one standard operation receive, this transceiver comprises:
Identification is as the logical circuit of the carrier frequency of this transceiver and the addressable shared broadcast channel of one or more other transceivers; With
The logical circuit of broadcast message on this shared broadcast channel, wherein this information is notified the existence of one or more other these transceivers of transceiver.
25, transceiver according to claim 24, wherein the logical circuit of discriminatory carrier frequency comprises:
The predetermined radio bands of scanning is to determine whether any one transceiver logical circuit of broadcast message on described shared broadcast channel in one or more other transceivers.
26, transceiver according to claim 25 comprises:
In response to neither one transceiver in definite other transceivers broadcast message on described shared broadcast channel, in predetermined radio bands, select the logical circuit of frequency and the shared broadcast channel of foundation.
27, transceiver according to claim 24, wherein said information comprise that this transceiver just is being used for the identifier of carrier frequency of transport service.
28, transceiver according to claim 24, wherein said information comprises the identifier of the positive occupied bandwidth of this transceiver.
29, transceiver according to claim 24, wherein said information comprises the identifier of the duty cycle that this transceiver is operated on radio-frequency spectrum.
30, transceiver according to claim 24, wherein said information comprises the identifier of the transmission power level that this transceiver is just using.
31, transceiver according to claim 24, wherein said information are included in the identifier of sharing the cycle of this information of broadcasting on the broadcast channel.
32, transceiver according to claim 24, wherein said information comprise the identifier of very first time point with respect to another time point, and this very first time point is the time point of broadcasting this information on the broadcast channel sharing.
33, transceiver according to claim 24, wherein said information comprises the identifier of the spreading factor that this transceiver is using.
34, transceiver according to claim 24, wherein said information comprises the identifier of the spreading code that this transceiver is using.
35, transceiver according to claim 24, wherein said information comprises the identifier of this transceiver feature, this feature makes one or more other transceivers can adjust operation to realize the interference of minimizing and this transceiver.
36, transceiver according to claim 24 wherein comprises at the logical circuit of sharing broadcast message on the broadcast channel:
By the logical circuit that uses first signaling format on described shared broadcast channel, to broadcast first segmentation sharing broadcast message on the broadcast channel; With
By the logical circuit that uses second signaling format on described shared broadcast channel, to broadcast second segmentation sharing broadcast message on the broadcast channel,
Wherein said first signaling format is different from described second signaling format.
37, transceiver according to claim 24 wherein comprises at the logical circuit of sharing broadcast message on the broadcast channel:
Use signaling format that this transceiver and every other transceiver use sharing broadcast message on the broadcast channel and receiving the logical circuit of information from this shared broadcast channel.
38, transceiver according to claim 24 wherein comprises at the logical circuit of sharing broadcast message on the broadcast channel:
Approximate by the approximate signaling format of all first and other transceivers to share broadcast message on the broadcast channel and to receive the logical circuit of information from this shared broadcast channel.
39, transceiver according to claim 24 wherein comprises at the logical circuit of sharing broadcast message on the broadcast channel:
The logical circuit of approximate continuous phase modulated (CPM) signaling format, the CPM modulation index that this form has greater than first and other communication standards in the employed maximum CPM modulation index of any standard, and its symbol time that has greater than first and other communication standards in the employed long symbol time of any standard.
40, according to the described transceiver of claim 39, the logical circuit of approximate continuous phase modulated (CPM) signaling format wherein, the CPM modulation index that this form has greater than first and other communication standards in the employed maximum CPM modulation index of any standard, its symbol time that has greater than first and other communication standards in the employed long symbol time of any standard, this logical circuit comprises:
For each information bit that is included in the information that on sharing broadcast channel, to broadcast, replace the logical circuit of corresponding symbol sebolic addressing; With
Each corresponding symbol sebolic addressing is offered the logical circuit of the data transmitter unit of operating according to first communication standard.
41, according to the described transceiver of claim 40, wherein said data transmitter unit comprises that generation will be sent out the delta-demodulators of signal waveform.
42, according to the described transceiver of claim 39, wherein the CPM signaling format is the Continuous phase frequency shift keying signaling format.
43, transceiver according to claim 24, wherein this transceiver is operated in first frequency band, and at least one other transceiver is operated in nearby frequency bands.
44, according to the described transceiver of claim 43, wherein said shared broadcast channel is positioned at this nearby frequency bands.
45, a kind of transceiver that in the wireless communications environment that can comprise one or more other transceivers, uses, wherein this transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in described one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to first and other communication standards in the business that sends of any one standard can not by according to first and other communication standards in the receiver of other any one standard operation receive, this transceiver comprises:
Identification is as the logical circuit of the carrier frequency of this transceiver and the addressable shared broadcast channel of one or more other transceivers; With
From the logical circuit of this shared broadcast channel reception information, wherein this information is notified the existence of described these one or more other transceivers of transceiver.
46, according to the described transceiver of claim 45, comprising:
In response to receiving this transceiver information that these one or more other transceivers exist of notifying, the operation of adaptive this transceiver is so that be reduced to and/or from the logical circuit of the interference of one or more other transceivers.
47, a kind of transceiver that in the wireless communications environment that can comprise one or more other transceivers, uses, wherein this transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in these one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to this first and other communication standards in the business that sends of any one standard can not by according to this first and other communication standards in the receiver of other any one standard operation receive, this transceiver comprises:
Identification is as the logical circuit of the carrier frequency of this transceiver and the addressable shared broadcast channel of one or more other transceivers;
The logical circuit of broadcast message on this shared broadcast channel, wherein this information is notified the existence of described one or more other these transceivers of transceiver; And
From the logical circuit of this shared broadcast channel reception information, wherein this information is notified the existence of described these one or more other transceivers of transceiver.
48, according to the described transceiver of claim 47, comprising:
In response to receiving this transceiver information that these one or more other transceivers exist of notifying, the operation of adaptive this transceiver is so that be reduced to and/or from the logical circuit of the interference of one or more other transceivers.
49, a kind of machinable medium, store one group of program command that is used at wireless communications environment operation first transceiver that can comprise one or more other transceivers thereon, wherein first transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to first and other communication standards in the business that any standard sent can not by according to first and other communication standards in the receiver of other any one standard operation receive, this group program command comprises makes processor operations transceiver logical circuit to carry out the instruction of following operation:
Identification is as the carrier frequency of first transceiver and the addressable shared broadcast channel of one or more other transceivers; And
Sharing broadcast message on the broadcast channel, wherein this information is notified the existence of described one or more these first transceivers of other transceivers.
50, a kind of machinable medium, store one group of program command that is used at wireless communications environment operation first transceiver that can comprise one or more other transceivers thereon, wherein first transceiver sends and receives professional according to first communication standard, and one or more transceivers bases in described one or more other transceivers and incompatible one or more other communication standards transmissions and the reception business of first communication standard, thereby according to first and other communication standards in the business that sends of any one standard can not by according to first and other communication standards in the receiver of other any one standard operation receive, this group program command comprises makes processor operations transceiver logical circuit carry out the following instruction of operating:
Identification is as the carrier frequency of first transceiver and the addressable shared broadcast channel of one or more other transceivers; And
Receive information from sharing broadcast channel, wherein this information is notified the existence of first these one or more other transceivers of transceiver.
51, according to the described machinable medium of claim 40, comprise the program command that makes processor operations transceiver logical circuit carry out following operation: in response to receiving first transceiver information that these one or more other transceivers exist of notifying, the operation of adaptive this first transceiver is so that be reduced to and/or from the interference of one or more other transceivers.
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| US54354304P | 2004-02-12 | 2004-02-12 | |
| US60/543,543 | 2004-02-12 | ||
| US11/021,164 | 2004-12-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465798B (en) * | 2007-12-19 | 2011-03-16 | 中兴通讯股份有限公司 | System and method for sharing mobile multimedia broadcast contents |
| CN102318214A (en) * | 2009-02-13 | 2012-01-11 | 高通股份有限公司 | Be used for chargeable and wireless power charging device |
| WO2016074192A1 (en) * | 2014-11-13 | 2016-05-19 | Qualcomm Incorporated | Using mbsfn for opportunistic detection of priority communications in multi-tiered access to licensed and unlicensed shared spectrum |
| CN114051214A (en) * | 2021-11-15 | 2022-02-15 | 杭州老板电器股份有限公司 | Method, device and system for sharing terminal functions |
-
2005
- 2005-02-07 CN CN200580004773A patent/CN100592698C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465798B (en) * | 2007-12-19 | 2011-03-16 | 中兴通讯股份有限公司 | System and method for sharing mobile multimedia broadcast contents |
| CN102318214A (en) * | 2009-02-13 | 2012-01-11 | 高通股份有限公司 | Be used for chargeable and wireless power charging device |
| CN102318214B (en) * | 2009-02-13 | 2015-04-29 | 高通股份有限公司 | Method and device for transmitting electricity or receiving electricity via wireless electric field |
| US9407327B2 (en) | 2009-02-13 | 2016-08-02 | Qualcomm Incorporated | Wireless power for chargeable and charging devices |
| WO2016074192A1 (en) * | 2014-11-13 | 2016-05-19 | Qualcomm Incorporated | Using mbsfn for opportunistic detection of priority communications in multi-tiered access to licensed and unlicensed shared spectrum |
| CN114051214A (en) * | 2021-11-15 | 2022-02-15 | 杭州老板电器股份有限公司 | Method, device and system for sharing terminal functions |
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