CN1239631A - Carrier sensor - Google Patents
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- CN1239631A CN1239631A CN98801317A CN98801317A CN1239631A CN 1239631 A CN1239631 A CN 1239631A CN 98801317 A CN98801317 A CN 98801317A CN 98801317 A CN98801317 A CN 98801317A CN 1239631 A CN1239631 A CN 1239631A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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Abstract
The reception levels of a control channel and a communication channel received by an antenna (11) are metered by a received field strength meter (12). The ratio of the strength of a desired wave to that of an interfering wave when a channel is assigned is calculated as an estimated value by a desired wave/interfering wave calculator (13), and the output is compared with a threshold value assuring a communication quality by a comparator (14). If the ouput exceeds the threshold value, a carrier is assigned.
Description
Technical field
The carrier sensor that the present invention relates to use in the radio communications system.
Background of invention
With reference to the traditional carrier sensor of block diagram illustrating shown in Figure 1.In this carrier sensor, the received electric field strength of the signal that 2 pairs of antennas 1 of received electric field strength detector are received detects.Then, comparator 4 determines whether the value of received electric field strength surpasses the threshold value in the period unit.If the level of disturbing wave is detected and the level of disturbing wave surpasses threshold value for each period, so, determines that carrier wave can not be used.In other words, though the level of required ripple greater than the level of disturbing wave with and communication quality be good, can measure, using if the level of disturbing wave surpasses the certain threshold level carrier wave.On the other hand,, so, determine that carrier wave is operable, utilize the period of this carrier transmit corresponding to the already used reception period in detection if the value of disturbing wave is no more than threshold value.
Equalizer 3 does not utilize the instantaneous electric field intensity that comprises the decline variation to carry out equilibrium.But equalizer 3 carries out equilibrium to the instantaneous electric field intensity between some periods, thereby obtains to receive the received electric field strength of period.This has improved the accuracy in detection of received electric field strength.
Yet, in above-mentioned traditional carrier sensor, under sub-district a and sub-district b situation adjacent one another are, only utilize the value of received electric field strength to carry out carrier sense.For this reason, the distance between a base station a and the required base station is short, the received electric field strength height.In addition, even in communications status,, determine that so carrier wave is using if the interference level that the summation of the level of level by jamming station a and jamming station b obtains surpasses certain threshold level.This just draws the shortcoming that carrier wave is assigned to other channel.Therefore, reduced the efficient that the radio communications system medium frequency uses.
Disclosure of the Invention
The purpose of this invention is to provide a kind of carrier sensor that can improve radio communications system medium frequency service efficiency.
Above-mentioned purpose can realize by such carrier sensor, and in and the situation that can communicate high at required received electric field strength, this device can be considered the level value of disturbing wave and carry out channel allocation.
In other words, with the received electric field strength detector incoming level of the control channel that receives from antenna and the incoming level of communication channel are detected.Then, calculate the ratio of required ripple, as estimated value to disturbing wave.Then, threshold value and the estimated value that guarantees communication quality compared mutually.If the output that produces greater than threshold value, is given channel with allocation of carriers so.
The accompanying drawing summary
Fig. 1 is the block diagram of traditional carrier sensor.
Fig. 2 is the concept map of traditional carrier sensor.
Fig. 3 is the block diagram according to the carrier sensor of first embodiment of the invention.
Fig. 4 is the concept map according to the carrier sense of each channel of first embodiment of the invention.
Fig. 5 is the block diagram according to the carrier sensor major part of second embodiment of the invention.
Fig. 6 is the concept map that the decline of second embodiment changes.
Fig. 7 is the block diagram according to the major part of the carrier sensor of third embodiment of the invention.
Fig. 8 is the block diagram according to the major part of the carrier sensor of fourth embodiment of the invention.
Fig. 9 is the block diagram according to the major part of the carrier sensor of fifth embodiment of the invention.
Figure 10 is the key diagram according to the time of the carrier sense of fifth embodiment of the invention.
Figure 11 is the block diagram according to the major part of the carrier sensor of sixth embodiment of the invention.
Figure 12 is the block diagram according to the major part of the carrier sensor of seventh embodiment of the invention.
Implement best mode of the present invention
Carrier sensor of the present invention comprises: an antenna that receives control channel and communication channel; Detect institute State the received electric field strength detector of the received electric field strength of antenna; The calculating that disturbing wave is arranged for required ripple Device, from the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel Detected value calculates the ratio of described required ripple and described disturbing wave; Threshold value and the institute of described communication channel will be distributed to State the comparator that the described output of calculator compares; And carry out the channel branch according to the output of described comparator The control device of joining.
In addition, in the carrier sensor of the antenna that comprises a reception control channel and communication channel, this The method of bright carrier sense comprises step: utilize the received electric field strength checkout gear to detect the reception of described antenna Electric-field intensity; Utilize and calculate required ripple to the calculation element of the ratio of disturbing wave, from the reception electric-field strength of communication channel The detected value of the detected value of degree and the received electric field strength of control channel calculates described required ripple and described disturbing wave Ratio; Utilize comparison means will distribute to the threshold value of communication channel and the output of calculation element compares; With There is disturbing wave even reach, the channel that can communicate by letter is detected.
Adopt said structure, utilize required ripple to the ratio definite threshold of disturbing wave and distribute this channel. Because this One reason is even exist disturbing wave also can effectively detect the channel that can communicate by letter.
In carrier sensor of the present invention, the received electric field strength detector preferably comprises the equilibration device that the instantaneous received electric field strength level on several periods is averaged.
In addition, in carrier sense method of the present invention, preferably, received electric field strength detects and utilizes equilibration device that the instantaneous received electric field strength level on several periods is averaged and according to the variation that decline causes the received electric field strength level detected.
Adopt said structure, the instantaneous level deviation that decline is caused averages, and the variation that causes according to decline can correctly detect the received electric field strength level.
In addition, in carrier sensor of the present invention, calculator preferably comprises the received electric field strength level by control channel, be the received electric field strength level of required ripple and the received electric field strength level of communication channel, promptly the received electric field strength level of disturbing wave obtains the divider of required ripple to the ratio of disturbing wave.
In addition, in carrier sense method of the present invention, preferably, calculation element utilizes the received electric field strength level of devision device from control channel, be the received electric field strength level of required ripple and the received electric field strength level of communication channel, the received electric field strength level that is disturbing wave obtains the ratio of required ripple to disturbing wave, calculates the ratio of required ripple to disturbing wave thus.
According to said structure,, therefore, can calculate the ratio of required ripple to disturbing wave owing to the ratio of required ripple to disturbing wave can be obtained by divider.
Have again, in carrier sensor of the present invention, calculator preferably comprises the received electric field strength level with control channel, be the received electric field strength level of required ripple and the received electric field strength level of described communication channel, promptly the received electric field strength level transitions of disturbing wave is the dB transducer of dB value and obtains the subtracter of required ripple to the ratio of disturbing wave by these outputs.
In addition, in carrier sense method of the present invention, preferably, calculation element utilizes the received electric field strength level of dB transducer with control channel, be the received electric field strength level of required ripple and the received electric field strength level of described communication channel, the received electric field strength level transitions that is disturbing wave is the dB value and utilizes subtracter to obtain the ratio of required ripple to disturbing wave from these outputs.
According to said structure,, therefore, can calculate the ratio of required ripple at high speed without divider to disturbing wave because signal level can be changed into the dB value.
In addition, a kind of carrier sensor of the present invention comprises: the antenna that receives control channel; The antenna of received communication channel; Detect the received electric field strength detector of the received electric field strength of the antenna of each channel in control channel and the communication channel; The calculator that disturbing wave is provided with for required ripple calculates the ratio of required ripple to disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of communication channel and control channel; The comparator that the output of distributing to the threshold value of communication channel and calculator is compared; And the control device that carries out channel allocation according to the output of comparator.
In addition, in the carrier sensor of the antenna that comprises an antenna that receives control channel and a received communication channel, a kind of method of carrier sense comprises step: utilize the received electric field strength checkout gear to detect the received electric field strength of the antenna of each channel in control channel and the signal of communication; Utilize to calculate the calculation element of required ripple, calculate the ratio of required ripple disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of communication channel and control channel to the ratio of disturbing wave; Utilize comparison means will distribute to the threshold value of communication channel and the output of calculation element compares; Even and have disturbing wave, at high speed vacant channel is detected.
According to said structure, two antennas are set, one is communication channel, another is a control channel., on the time of control channel, can the carrier wave of communication channel be detected for this reason, can detect vacant channel at high speed, and can carry out channel allocation.
In addition, carrier sensor of the present invention comprises: an antenna that receives control channel; A plurality of antennas that spatially are separated from each other the received communication channel of arrangement; Detect the received electric field strength detector of the received electric field strength of the antenna of each channel in control channel and the communication channel; From the output of the detector of a plurality of communication channels, select a selector with antenna of maximum received electric field strength level; The calculator that disturbing wave is provided with for required ripple calculates the ratio of required ripple to disturbing wave from the detected value of the output of selector and the received electric field strength that is used to control; The comparator that the output of distributing to the threshold value of communication channel and calculator is compared; And the control device that carries out channel allocation according to the output of comparator.
In addition, in the carrier sensor of the antenna of the present invention that comprises an antenna that receives control channel and a plurality of received communication channels that spatially are separated from each other arrangement, a kind of method of carrier sense comprises step: utilize the received electric field strength checkout gear to detect the received electric field strength of the antenna of each channel in control channel and the communication channel; Utilize choice device from the output of the detector of a plurality of communication channels, to select a antenna with maximum received electric field strength level; Utilize to calculate the calculation element of required ripple, calculate the ratio of required ripple disturbing wave from the detected value of the output of selector and the received electric field strength that is used to control to the ratio of disturbing wave; Utilize comparison means will distribute to the threshold value of communication channel and the output of calculator compares; Even and have the disturbing wave changed by decline, the maximum field intensity of the disturbing wave of communication channel is detected, calculate the ratio of required ripple thus to disturbing wave.
According to said structure, adopt a plurality of antennas to come received signal for communication channel.For this reason, even there is the disturbing wave that changed by decline, can the maximum field intensity of communication channel be detected, and can correctly calculate the ratio of required ripple disturbing wave.
In addition, carrier sensor of the present invention comprises: the antenna of each channel in a plurality of reception control channels that spatially are separated from each other arrangement and the communication channel; Detect the received electric field strength detector of the received electric field strength of the antenna of each channel in control channel and the communication channel; From the output of the detector of a plurality of control channels and communication channel, select a selector with antenna of maximum received electric field strength level; The calculator that disturbing wave is provided with for required ripple calculates the ratio of described required ripple and described disturbing wave from the detected value of the output of described selector and the described received electric field strength that is used to control; The comparator that the output of distributing to the threshold value of communication channel and calculator is compared; And the control device that carries out channel allocation according to the output of comparator.
In addition, in comprising a plurality of reception control channels that spatially are separated from each other arrangement and communication channel in the carrier sensor of the present invention of the antenna of each channel, the method of a kind of carrier sense of the present invention comprises step: utilize the received electric field strength checkout gear to detect the received electric field strength of the antenna of each channel in control channel and the communication channel; Utilize choice device from the output of the detector of a plurality of communication channels, to select a antenna with maximum received electric field strength level; Utilize to calculate the calculation element of required ripple, calculate the ratio of required ripple disturbing wave from the detected value of the output of choice device and the received electric field strength that is used to control to the ratio of disturbing wave; Utilize comparison means will distribute to the threshold value of communication channel and the output of calculator compares; Even and because there is the variation of electric field strength in decline in required ripple and disturbing wave, also the maximum field intensity to each channel in control channel and the communication channel detects, and calculates the ratio of required ripple to disturbing wave thus.
According to said structure, in two kinds of situations of communication channel and control channel, adopt a plurality of antennas.For this reason, even, can the maximum field intensity of each channel in control channel and the communication channel be detected because there is the variation of electric field strength in decline in required ripple and disturbing wave.As a result, can correctly calculate the ratio of required ripple to disturbing wave.
With reference now to accompanying drawing, specifically describes embodiments of the invention.
(first embodiment)
Fig. 3 is arranged on the block diagram according to the carrier sensor of first embodiment of the invention in the base station of radio communications system.Fig. 4 is the concept map of detection level of the received electric field strength of the detection level of received electric field strength of explanation control channel and communication channel.
Usually, vacant channel is carried out News Search with system to be allocated in, for example in the TDMA structural system of employed TDMA/TDD system of PHS system and the employed CDMA/TDD of cellular telephone system, the control channel of reverse link adopts the frequency that is different from communication channel.For this reason, be substantially devoid of disturbing wave among them.In addition, communication channel can be counted as disturbing wave before being assigned with.
In addition, the level of the level of the electric field strength that is received in the control channel of reverse link and the electric field strength that received in communication channel is from predesignated subscriber's emission of leaving the base station same distance.For this reason, can think that the correlation between them is high.In other words, can estimate that after channel allocation, communication channel is the same mutually basically on the level of the electric field strength of required ripple with control channel.
According to estimates, the electric field strength level of the control channel of reverse link is exactly the electric field strength level of required ripple signal.Then, the level of estimating is detected the electric field strength level of the disturbing wave signal of each period before being assigned with as communication channel.Utilize estimated value and detected value the two, can estimate the ratio of the required ripple level that can obtain on the time and disturbing wave level in channel allocation.
According to first embodiment, carry out carrier sense with the ratio of above-mentioned required ripple level and disturbing wave level, can detect carrier wave thus, because required ripple level height even the disturbing wave level is also high, also can adopt this carrier wave.Therefore, only can distribute differentiated to be the channel that can not communicate effectively by the disturbing wave level.This can obtain the effect of effective frequency utilization and channel capacity increase.
Work with reference to figure 3 explanations carrier sensor of the present invention.At first, in control channel, from antenna a11 received signal.With the signal that received send received electric field strength detector 12 to, thereby the level of electric field to received signal detects.Detected level is set at required ripple level.
Then, channel is become communication channel.Then, similar to control channel, detect by the electric field level of received electric field strength detector 12 communication channel of each period.Detected level is set at interference level.Thereafter, utilize the electric field strength level of control channel and the electric field strength level of communication channel to calculate the ratio of required ripple to disturbing wave by calculator 13.
The output of calculating is sent to comparator 14, thereby ratio and the threshold value of required ripple to disturbing wave compared.In this case, set the threshold to the value that in the communication system of communication channel, can guarantee communication quality to the characteristic of disturbing wave by required ripple.Determine whether and to give the predesignated subscriber this channel allocation, as communication channel.
To provide more detailed description with reference to figure 4.The electric field strength of the signal that receives in the control channel is detected level be set at D1.For each period, the electric field strength of the signal that receives in the communication channel is detected level detect.Each level is the electric field strength level of disturbing wave, and these level values are set at U1, U2, U3 and U4 respectively.
In this case, if with the agreement threshold setting be Uth, so, all periods all surpass this threshold value in communication channel.Owing to this reason, judge that iff the level that utilizes disturbing wave so, judgement can not distribute the period.Yet, even the level of disturbing wave surpasses threshold value, according to the relative size between disturbing wave and the required ripple, the situation that existence can be communicated by letter.For example, in the D1 of control channel, there is the big situation of level difference value between the electric field strength level of the electric-field strength level of disturbing wave and required ripple.Perhaps, existence can be adopted and have the situation of good required ripple to the communication system of disturbing wave characteristic in communication channel.In other words, can consider electric field strength level, but determine communication quality with the required ripple electric field strength and the ratio of disturbing wave electric field strength without disturbing wave.
Here, utilize the U1 to U4 of D1 and each period to calculate required ripple to disturbing wave by following formula.Then, the calculated value with each period is set at C1, C2, C3 and C4.
Here, suppose that the threshold value of disturbing wave level commonly used is Uth, in communication channel, guaranteeing that to the characteristic of disturbing wave the predetermined threshold of communication quality is set at Duth by required ripple.In traditional carrier sense method, required ripple level all surpasses threshold value to the ratio of disturbing wave level in all periods.For this reason, think that all channels are in use, can not carry out user's channel allocation.On the other hand, consider threshold value Duth, high or adopt and have in the good situation of required ripple at the required level of control channel to the communication system of disturbing wave characteristic, can give the user with channel allocation.Even this is because also can communicate channel allocation fully to the user.
Here, at first from required ripple ratio (C1, C2, C3, C4) maximum of middle selection to disturbing wave.
Max{C1，C2，C3，C4}
Then, by following formula selection result and threshold value are compared mutually:
Duth＜C3
That is, whether the required ripple of determining this period surpasses threshold value to the maximum ratio of disturbing wave.Determine whether the period of distributing carrier wave thus.
Consider the ratio of required ripple, have such period disturbing wave, though ratio greater than threshold value Uth, this period is enough to and can communicates.In this case, consider threshold value Duth, can will should distribute the period as communication channel.In state shown in Figure 4, distributed the period 3.
Attention: threshold value is according to the required ripple of communication system used in the communication channel characteristic of disturbing wave to be determined.Therefore, because radio communications system has designed the required ripple that satisfies the communication quality requirement ratio to disturbing wave, can carry out stable communication.
(second embodiment)
Fig. 5 is the figure of major part of the carrier sensor of explanation second embodiment of the invention.Fig. 6 is the concept map that the decline of this embodiment of explanation changes.The carrier sensor of second embodiment carrier sensor than first embodiment on the accuracy in detection of received electric field strength level increases.
As shown in Figure 5, in this device, average with the received signal of 21 couples first embodiment of equilibration device.Then, the output of the output signal that produces as the detector of received electric field strength.Thus, in this device, handle to follow the decline variation.Attention: other structure of the carrier sensor of present embodiment is identical with the carrier sensor of first embodiment, omits the description to it.
In the situation of carrying out carrier sense, all channels are to utilize all reception electric field level to distribute.This produces material impact to communication quality.In addition, because the user communicates while walking about, receive electric field level and stand the decline variation.For example, shown in Fig. 6 (a), only on the instantaneous electric field intensity level of specific period, the received electric field strength level is detected.As a result, when reaching the trough part of decline, determines the moment of detecting that the electric field strength level is low.Then, channel to be detected is defined as vacant channel and distributes this channel (#2 and #4 among Fig. 6 (a)).This can cause during the telephone conversation that interference level increases and disconnects being connected of network.
In order to improve accuracy in detection, testing result partly of several periods is averaged, on average level, carry out carrier sense.More particularly, shown in Fig. 4 (b), electric field level is averaged, even so that in the trough part of decline the electric field strength level is detected also and can correctly determine vacant channel.This makes the variation and the detection received electric field strength level that absorb the disturbing wave level become possibility.
(the 3rd embodiment)
Fig. 7 is the figure of major part of the carrier sensor of explanation third embodiment of the invention.The 3rd embodiment will illustrate that required ripple is to the processing method of the calculator of disturbing wave among first embodiment.Attention: other structure of the carrier sensor of present embodiment is identical with the carrier sensor of first embodiment, and its description is omitted.
At first, be input to divider 31 to what in first embodiment, calculated in the temporal received electric field strength value of control channel with in the temporal received electric field strength value of communication channel.Then, can obtain the ratio of required ripple to disturbing wave.If ratio is C, required ripple level is D, and the disturbing wave level is U, then can set up following formula:
By obtaining above-mentioned ratio, the indicated value that acquisition can be judged according to communication quality is possible.
(the 4th embodiment)
Fig. 8 is the figure of major part of the carrier sensor of explanation fourth embodiment of the invention.The 4th embodiment will illustrate that required ripple is to the processing method of the calculator of disturbing wave among first embodiment.Attention: other structure of the carrier sensor of present embodiment is identical with the carrier sensor of first embodiment, and its description is omitted.
In utilizing first embodiment, calculate in the temporal received electric field strength value of control channel with aspect the temporal received electric field strength value of communication channel, present embodiment is identical with the 3rd embodiment.If adopt divider to calculate the ratio of required ripple electric field strength level and disturbing wave electric field strength level, so, need carry out a large amount of calculating.In the present embodiment, be the dB value by dB transducer 41 with the electric field strength level transitions.
The conversion table corresponding mutually according to electric field strength level and dB value carries out the dB conversion.By dB transducer 41 conversion be sent to subtracter 42 to the dB value of control channel with to the dB value of communication channel, thereby calculate the ratio of required ripple to disturbing wave.Here, if required ripple is Da, disturbing wave is Ub, and the dB value is respectively Ca and Cb, so, can set up following formula:
Ca＝20log
10Da[dBμ]
Cb＝20log
10Ua[dBμ]
According to the conversion that proceeds to the dB value as mentioned above.
In addition, if required ripple is Cab to the ratio of disturbing wave, so, can set up following formula:
Cab＝Ca－Cb[dBμ]
According to above structure, utilizing dB conversion table and subtracter 42 to make to carry out more high speed dB computing and promptly calculating required ripple becomes possibility to the ratio of disturbing wave.
(the 5th embodiment)
Fig. 9 is the block diagram of structure of the carrier sensor of explanation fifth embodiment of the invention.In the carrier sensor of the 5th embodiment, be provided with two antennas.In the situation of an antenna, the detection of the detection of the electric field strength level of control channel and the electric field strength level of communication channel is carried out successively.For this reason, spend the channel of many time allocation of communication channels.That is to say that several antennas according to shown in Figure 10 (a) and 10 (b) can shorten the required time of carrier sense.
For above-mentioned reasons, in order to carry out the high speed carrier sense, be provided with two antennas, the electric field strength level to required ripple in control channel detects.Then, in communication channel, the electric field strength level to the disturbing wave of each period detects concurrently, so that can both carry out channel allocation at any time.Attention: the carrier sensor of other structure of carrier sensor and first embodiment is identical in the present embodiment, and its description is omitted.The work of the carrier sensor of present embodiment below will be described.
In Fig. 9, respectively by the antenna b51 of control channel and the antenna c52 receive channel signal of communication channel.As illustrated among the above embodiment, send the signal that receives to received electric field strength detector 53 and 54 respectively.Then, these detectors detect the electric field strength level, and testing result is sent to the calculator 55 of required ripple to disturbing wave, thereby calculate the ratio of required ripple to disturbing wave.Comparator 56 is delivered in the output of calculator 55, thereby compares with threshold value.If output surpasses threshold value, so, determine and can communicate, and allocated channel.Attention: threshold setting is for guaranteeing the predetermined value of communication quality.This can realize carrier sense at a high speed.In addition, can shorten the time of carrier sense, handle the characteristic that changes immediately following decline in the transmission line in this device so that can improve.
(the 6th embodiment)
Figure 11 is the block diagram of structure of the carrier sensor of explanation sixth embodiment of the invention.The 6th embodiment will be illustrated as this situation that communication channel is provided with a plurality of antenna M.For convenience of explanation, following description shows the situation that adopts two antennas.Yet antenna is many more, and performance is good more.It is to carry out in the state of arranging a plurality of separated antennas spatially for communication channel that signal receives.This corresponding to stand independent decline that change with the reception corresponding signal of a plurality of antennas, may improve the reliability of carrier sense thus.Attention: the carrier sensor of other structure of carrier sensor and first embodiment is identical in the present embodiment, and its description is omitted.The work of the carrier sensor of present embodiment below will be described.
That is,, can select a better antenna in order to communicate the carrier sense of channel.In this case, better antenna has following implication.
More particularly, select a antenna with lowest interference level.This means and select to have the antenna of maximum required ripple the ratio of disturbing wave.The work of carrier sensor below will be described.
The antenna f63 of the antenna d61 of control channel, the antenna e62 of communication channel and communication channel is received signal respectively.Each received signal is delivered to each received electric field strength detector 64 to 66, and electric field strength level to received signal detects thus.
With being connected of communication channel in, the electric field strength testing result is delivered to selector 67.Then, select the relatively low antenna of at least one disturbing wave level.In this case, interference level be meant if this disturbing wave level again increase can cause the level of communication failure.Select its signal that has received to have all antennas less than this disturbing wave level electric field strength testing result.
Then, the required ripple electric field strength level of control channel and the output of selector 67 are delivered to the calculator 68 of required ripple to disturbing wave.Calculator 68 calculates the ratio of required ripple to disturbing wave.In addition, similar to the 5th embodiment, will export with threshold value by comparator 69 and to compare mutually.Then, the selector (not shown) selects to have received required ripple surpasses the signal of threshold value to the ratio of disturbing wave antenna.If a plurality of such antennas are set, so, select to have the antenna of maximum required ripple, and distribute this channel the ratio of disturbing wave.Attention: threshold value is set to guarantee the predetermined value of communication quality.Above-mentioned structure can reduce the influence of the communication quality that decline is caused and can guarantee stable communication quality.
(the 7th embodiment)
Figure 12 is the block diagram of structure of the carrier sensor of explanation seventh embodiment of the invention.In this carrier sensor, the number of antenna is set at M.For convenience of explanation, the description that below provides shows that a kind of control channel adopts two antennas and communication channel to adopt the situation of two antennas.Attention: the carrier sensor of other structure of carrier sensor and first embodiment is identical in the present embodiment, and its description is omitted.The work of the carrier sensor of present embodiment below will be described.
At first, antenna g71, antenna h72, antenna i73 and antenna j74 difference received signal.Similar to the 6th embodiment, each received signal is delivered to each received electric field strength detector 75 to 78, electric field strength level to received signal detects thus.
With being connected of control channel in, the electric field strength testing result is delivered to selector 79.Then, select the higher relatively antenna of at least one required ripple level according to the required ripple of each antenna.Select its signal that has received to have all antennas of the electric field strength testing result of required ripple preset level.With being connected of communication channel in, the electric field strength testing result is delivered to selector 80.Then, according to the disturbing wave of each antenna, select the relatively low antenna of at least one disturbing wave level.In this case, interference level be meant if this disturbing wave level again increase can cause the level of communication failure.Select its signal that has received to have all antennas less than the electric field strength testing result of this disturbing wave level.
Then, the output of these selectors 79 and 80 is delivered to the calculator 81 of required ripple to disturbing wave.Calculator 81 calculates the ratio of the required ripple of the various combinations of exporting to disturbing wave.In addition, similar to the 5th embodiment, will export with threshold value by comparator 82 and to compare mutually.Then, the selector (not shown) signal selecting to have received is corresponding to showing that required ripple surpasses the antenna of the combination of threshold value to the ratio of disturbing wave.If a plurality of antennas are set like this, so, select to have the antenna of maximum required ripple, and distribute this channel the ratio of disturbing wave.Attention: threshold value is set to guarantee the predetermined value of communication quality.
According to above-mentioned structure, the number of antennas of control channel is two or more.As a result, not only with communication channel and also with being connected of control channel in, can change according to decline and carry out the detection of required ripple level exactly.Can improve the accuracy of required ripple to the ratio of disturbing wave, this is an indicatrix in order to definite communication quality, thereby can correctly carry out carrier sense.As a result, channel allocation can be carried out effectively, and the speed that frequency is effectively utilized can be improved, and the channel capacity that can increase each sub-district.
As mentioned above, according to the present invention, utilize the electric field strength level of control channel to calculate the ratio of the required ripple of each period to disturbing wave.Then, distribute the period according to ratio calculated, even so that disturbing wave level height also can carry out carrier sense effectively.Owing to this reason,, also can improve the efficient of frequency utilization and the message capacity that can improve each sub-district even the sub-district is adjacent mutually and have disturbing wave.
In addition, required ripple sets the threshold to the characteristic of disturbing wave and guarantees predetermined communication quality in the communication system according to communication channel.As a result, and only carry out the conventional situation that the period distributes and compare, can effectively utilize frequency according to disturbing wave received electric field strength level.
Industrial applicibility
The present invention is suitable for adopting vacant channel is carried out News Search with system to be allocated, for example at PHS The CDMA/TDD's that uses in the TDMA/TDD system of the use in the system and the cellular telephone system The radio communications system of TDMA structural system.
Claims (16)
1. carrier sensor is characterized in that described device comprises:
Receive an antenna of control channel and communication channel;
The received electric field strength detector detects the received electric field strength of described antenna;
Calculator for required ripple is provided with disturbing wave, calculates the ratio of described required ripple and described disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel;
Comparator compares distributing to the threshold value of described communication channel and the output of described calculator; And
Control device carries out channel allocation according to the output of described comparator.
2. carrier sensor as claimed in claim 1 is characterized in that: described received electric field strength detector comprises the equilibration device that the instantaneous received electric field strength level on several periods is averaged.
3. carrier sensor as claimed in claim 1, it is characterized in that: described calculator comprises the received electric field strength level by described control channel, be the received electric field strength level of required ripple and the received electric field strength level of described communication channel, i.e. the received electric field strength level of disturbing wave and obtain the divider of required ripple to the ratio of disturbing wave.
4. carrier sensor as claimed in claim 1, it is characterized in that: described calculator comprises the received electric field strength level with described control channel, be the received electric field strength level of required ripple and the received electric field strength level of described communication channel, promptly the received electric field strength level transitions of disturbing wave is the dB transducer of dB value and obtains the subtracter of required ripple to the ratio of disturbing wave by these outputs.
5. carrier sensor is characterized in that described device comprises:
Receive the antenna of control channel;
The antenna of received communication channel;
The received electric field strength detector detects the received electric field strength of the antenna of each channel in described control channel and the communication channel;
Calculator for required ripple is provided with disturbing wave, calculates the ratio of described required ripple and described disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel;
Comparator compares distributing to the threshold value of described communication channel and the described output of described calculator; And
Control device carries out channel allocation according to the output of described comparator.
6. carrier sensor is characterized in that described device comprises:
Receive the antenna of control channel;
The a plurality of antennas that spatially are separated from each other arrangement of received communication channel;
The received electric field strength detector detects the received electric field strength of the antenna of each channel in described control channel and the communication channel;
Selector is selected the antenna with maximum received electric field strength level from the output of the detector of described a plurality of communication channels;
Calculator for required ripple is provided with disturbing wave, calculates the ratio of described required ripple and described disturbing wave from the detected value of the output of described selector and the described received electric field strength that is used to control;
Comparator compares distributing to the threshold value of described communication channel and the described output of described calculator; And
Control device carries out channel allocation according to the output of described comparator.
7. carrier sensor is characterized in that described device comprises:
Receive a plurality of antennas that spatially are separated from each other arrangement of each channel in control channel and the communication channel;
The received electric field strength detector detects the received electric field strength of the antenna of each channel in described control channel and the communication channel;
Selector is selected the antenna with maximum received electric field strength level from the output of the detector of a plurality of control channels and communication channel;
Calculator for required ripple is provided with disturbing wave, calculates the ratio of described required ripple and described disturbing wave from the detected value of the output of described selector and the described received electric field strength that is used to control;
Comparator compares distributing to the threshold value of described communication channel and the described output of described calculator; And
Control device carries out channel allocation according to the output of described comparator.
8. method of carrying out carrier sense in the carrier sensor that comprises an antenna that receives control channel and communication channel is characterized in that said method comprising the steps of:
Utilize the received electric field strength checkout gear to detect the received electric field strength of described antenna;
Utilize to calculate the calculation element of required ripple, calculate the ratio of described required ripple and described disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel the ratio of disturbing wave;
Utilize comparison means will distribute to the threshold value of described communication channel and the described output of described calculation element compares; And
Even exist disturbing wave also communication channel to be detected.
9. carrier sense method as claimed in claim 8, it is characterized in that: described received electric field strength checkout gear utilizes equilibration device that the instantaneous received electric field strength level on several periods is averaged and according to the variation that decline causes the received electric field strength level detected.
10. carrier sense method as claimed in claim 8, it is characterized in that: described calculation element utilizes devision device, received electric field strength level from described control channel, be the received electric field strength level of required ripple and the received electric field strength level of described communication channel, the received electric field strength level that is disturbing wave obtains the ratio of required ripple to disturbing wave, calculates the ratio of required ripple to disturbing wave thus.
11. carrier sense method as claimed in claim 8, it is characterized in that: described calculation element utilizes the dB conversion equipment, received electric field strength level with described control channel, be the received electric field strength level of required ripple and the received electric field strength level of described communication channel, the received electric field strength level transitions that is disturbing wave is the dB value, utilizes substracting unit to obtain the ratio of required ripple to disturbing wave from described dB value.
12. a method of carrying out carrier sense in the carrier sensor of the antenna of an antenna that comprises a reception control channel and a received communication channel is characterized in that said method comprising the steps of:
Utilize the received electric field strength checkout gear to detect the received electric field strength of the antenna of each channel in described control channel and the signal of communication;
Utilize to calculate the calculation element of required ripple, calculate the ratio of described required ripple and described disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel the ratio of disturbing wave;
Utilize comparison means will distribute to the threshold value of described communication channel and the described output of described calculation element compares; And
Even there is disturbing wave, at high speed vacant channel is detected.
13. a method of carrying out carrier sense in the carrier sensor of the antenna that comprises an antenna that receives control channel and a plurality of received communication channels that spatially are separated from each other arrangement is characterized in that said method comprising the steps of:
Utilize the received electric field strength checkout gear to detect the received electric field strength of the antenna of each channel in described control channel and the communication channel;
Utilize choice device from the output of the detector of a plurality of communication channels, to select a antenna with maximum received electric field strength level;
Utilize to calculate the calculation element of required ripple, calculate the ratio of described required ripple and described disturbing wave from the detected value of the output of described selector and the described received electric field strength that is used to control the ratio of disturbing wave;
Utilize comparison means will distribute to the threshold value of described communication channel and the described output of described calculator compares; And
Also the maximum field intensity of the disturbing wave of communication channel is detected by disturbing wave that decline changes even exist, to calculate the ratio of required ripple thus disturbing wave.
14. carry out the method for carrier sense in the carrier sensor of the antenna of each channel in comprising a plurality of reception control channels that spatially are separated from each other arrangement and communication channel, it is characterized in that said method comprising the steps of:
Utilize the received electric field strength checkout gear to detect the received electric field strength of the antenna of each channel in described control channel and the communication channel;
Utilize choice device from the output of the detector of a plurality of control channels and communication channel, to select a antenna with maximum received electric field strength level;
Utilize to calculate the calculation element of required ripple, calculate the ratio of described required ripple and described disturbing wave from the detected value of the output of described choice device and the described received electric field strength that is used to control the ratio of disturbing wave;
Utilize comparison means will distribute to the threshold value of described communication channel and the described output of described calculator compares; And
Even because there is the variation of electric field strength in decline in required ripple and disturbing wave, also the maximum field intensity to each channel in control channel and the communication channel detects, and calculates the ratio of required ripple to disturbing wave thus.
15. the base station with carrier sensor is characterized in that, described carrier sensor comprises:
Receive an antenna of control channel and communication channel;
The received electric field strength detector detects the received electric field strength of described antenna;
Calculator for required ripple is provided with disturbing wave, calculates the ratio of described required ripple and described disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel;
Comparator compares distributing to the threshold value of described communication channel and the described output of described calculator; And
Control device carries out channel allocation according to the output of described comparator.
16. a communication terminal that carries out radio communication with the base station with carrier sensor is characterized in that, described carrier sensor comprises:
Receive an antenna of control channel and communication channel;
The received electric field strength detector detects the received electric field strength of described antenna;
Calculator for required ripple is provided with disturbing wave, calculates the ratio of described required ripple and described disturbing wave from the detected value of the received electric field strength of the detected value of the received electric field strength of described communication channel and described control channel;
Comparator compares distributing to the threshold value of described communication channel and the described output of described calculator; And
Control device carries out channel allocation according to the output of described comparator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP264975/97 | 1997-09-10 | ||
| JP9264975A JPH1188256A (en) | 1997-09-10 | 1997-09-10 | Carrier sense device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1239631A true CN1239631A (en) | 1999-12-22 |
Family
ID=17410821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98801317A Pending CN1239631A (en) | 1997-09-10 | 1998-09-09 | Carrier sensor |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH1188256A (en) |
| KR (1) | KR20000068923A (en) |
| CN (1) | CN1239631A (en) |
| AU (1) | AU9000898A (en) |
| WO (1) | WO1999013660A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4591256B2 (en) * | 2005-07-27 | 2010-12-01 | パナソニック株式会社 | Receiver and program thereof |
| JP2008017515A (en) * | 2007-08-27 | 2008-01-24 | Kyocera Corp | Method of adjusting transmission and reception system in adaptive array base station and adaptive array radio device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07170220A (en) * | 1993-12-14 | 1995-07-04 | Matsushita Electric Ind Co Ltd | Diversity receiver |
| JPH07312590A (en) * | 1994-05-16 | 1995-11-28 | Kyocera Corp | Method for selecting antenna of diversity |
| JPH0888593A (en) * | 1994-09-20 | 1996-04-02 | Japan Radio Co Ltd | Switching system for diversity reception |
| JP3235407B2 (en) * | 1995-06-05 | 2001-12-04 | 三菱電機株式会社 | Communication device, communication system, and channel suitability determination method |
-
1997
- 1997-09-10 JP JP9264975A patent/JPH1188256A/en active Pending
-
1998
- 1998-09-09 WO PCT/JP1998/004052 patent/WO1999013660A1/en not_active Application Discontinuation
- 1998-09-09 AU AU90008/98A patent/AU9000898A/en not_active Abandoned
- 1998-09-09 CN CN98801317A patent/CN1239631A/en active Pending
- 1998-09-09 KR KR1019997004061A patent/KR20000068923A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999013660A1 (en) | 1999-03-18 |
| JPH1188256A (en) | 1999-03-30 |
| AU9000898A (en) | 1999-03-29 |
| KR20000068923A (en) | 2000-11-25 |
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