CN102170642B - Wireless base station, wireless communication system and wireless communication method - Google Patents
Wireless base station, wireless communication system and wireless communication method Download PDFInfo
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- CN102170642B CN102170642B CN201010579180.5A CN201010579180A CN102170642B CN 102170642 B CN102170642 B CN 102170642B CN 201010579180 A CN201010579180 A CN 201010579180A CN 102170642 B CN102170642 B CN 102170642B
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Abstract
The invention relates to a wireless base station, a wireless communication system and a wireless communication method. The base station has a whole frequency communication mode and a partial frequency communication mode. The whole frequency communication mode communicates with over one terminal connected to the base station by using a whole system frequency band. The partial frequency communication mode communicates with over one terminal connected to the base station by using a dividing frequency band which divides the system frequency band into a plurality of frequency bands. A priority frequency band is formed by distributing one of the dividing frequency bands to each base station in advance. Each base station measures the combination of noise power and interference power of an uplink. Based on the result obtained by comparing the combination value with a preset first valve value, a whole frequency communication mode or a partial frequency communication mode using the priority frequency band is selected to communicate with the terminal.
Description
Technical field
The present invention relates to mobile wireless communication technology, the control technology of the allocation of radio resources that the interference that particularly relates to avoiding minizone is object.
Background technology
In the mobile wireless communication system of honeycomb type, configure dispersedly geographically a plurality of base stations or antenna, the scope arriving at the electric wave sending from these base stations or antenna, formed the coverage of the radio communication that is called as community.Mobile body terminal is controlled to the base station the highest with reception signal quality in terminal to be connected.The so-called signal quality that receives, generally with the received power of desired signal (desired signal) and the interference power of interference signal, the recently performance of receiver noise power, mainly with CINR (Carrier toInterference-plus-Noise Ratio signal power/(interference power+noise power)), describe.In addition, mobile wireless communication system has following framework: the movement of accompanying terminal, by successively switching the base station will connecting can maintain radio communication in mobile.Connectivity during in order to ensure movement, the border of the coverage that each base station or antenna form is overlapping.From each base station or the signal that sends of each antenna be the information towards a plurality of terminals that communicate via this base station or antenna, for the terminal communicating via other base station or antenna, form and disturb.Interference is a kind of obstruction for the communication towards other terminal, can cause the deterioration of communication quality and throughput.
Fig. 1 means the schematic diagram of the configuration example of mobile wireless communication system.
In Fig. 1, base station 101～103 is connected with core network, and carries out data communication between core side device 100.Base station apparatus 101 becomes high-frequency signal by the information conversion obtaining from core side device 100, and sends it to terminal 104 by wireless signal.Terminal 104 receives these wireless signals, by carrying out signal processing, is transformed into information, thus realize with core side device 100 between communicate by letter.On the other hand, the information that terminal 104 generates is transformed into high-frequency signal in terminal 104, and is sent to base station 101 by wireless signal.From terminal 104 wireless signal that send, that received by base station 101, by signal, process the information of being transformed into, and be sent to core side device 100.
In the example of Fig. 1, a plurality of base stations 101～103 are connected with core side device 100, and difference is the place transmitted signal of separation geographically.Terminal 104 is when receiving the signal of base station 101 base station transmission in addition, and this signal is received by terminal 104 as disturbing wave.
As a kind of method for reducing inter base station interference, be known to segmentation method (Segmentation).Segmentation method is that the interference that is suppressed at characteristic frequency band by cutting apart the frequency resource that mutually can utilize produces, thereby improve community, covers (cell coverage).
Next, with Fig. 2, segmentation method is described.
Fig. 2 means the schematic diagram of the distribution example of the Radio Resource in the base station after the interference reduction method of having applied based on segmentation method.
Figure 2 illustrates the allocation of radio resources example of the base station A that adjoins each other and B.In Fig. 2, the longitudinal axis represents that frequency axis, transverse axis represent time shaft.In illustrated example, frequency direction is the frequency band of 10MHz, is divided into three frequency f 1, f2, f3.The region that represents configuring preamble code (preamble) by the part that symbol 40 represents.The region that represents to configure control channel (the MAC information for distributing to terminal notification channel in the example of WiMAX) by the part that symbol 401 represents.By the part that symbol 403 represents, be the part that is called as common signal channel (Shared Channel), dispose the region of mainly using in the transmission of user profile.
As shown in Figure 2, in the base station of adjacency A, B, the frequency band of use is different.Frequency of utilization f1 in the A of base station.Frequency of utilization f2 in the B of base station.When the interference reduction method of having applied based on segmentation method, as mentioned above, between the base station of adjacency, do not use identical frequency.
Use Fig. 2 to describe the recycling of Radio Resource (reuse).In Fig. 2, the different situation of the frequency of using separately in the base station B of the base station A of upper figure and figure below is illustrated.That is, base station A is used 402 of lower frequency side, and adjacent base station B is used intermediate frequency 502.In adjacent base station B, do not use 504 of lower frequency side.Namely, frequency is divided into three sections (segment), a section in three sections is only used in each base station.Like this, just can in the cell boarder of interconnective three base stations, to Whole frequency band, recycle.This is referred to as to use by reusing 3 (repetition rates 3).If the frequency that the base station being adjacent to each other is used is different, communication each other is not just disturbed.Applied in the system of the interference reduction method based on such a segmentation method, the base station that sends the wireless signal that can disturb is not adjacent base station, but next adjacent base station.Because inferior adjacent base station is far away than adjacent base station distance, so the wireless signal that send the base station that the noise power ratio that can expect to receive from inferior adjacent base station is just connecting from terminal is little mutually.Segmentation method is the technology that the consideration method based on such reduces interference effect.
With Fig. 3, the resource between a plurality of base stations when having applied the interference reduction method based on segmentation method is distributed and is described below.
The configuration of seven base stations (600～606) has been shown in Fig. 3.
Each base station consists of three sectors (sector), and each sector covers the sector region centered by base station (600～606).Concern is positioned at the base station 603 of centre.For base station 603, if drawing top is thought to 0 degree deasil defines angle, be formed in the sector in 0 degree, 120 degree, 240 degree directions with border.So-called sector is that the base station that is opposite to a place is carried out partition space by the directive property of antenna by angle and the call of the community that forms.
In the example of Fig. 3, a base station forms three sectors, and each sector is controlled so as to just like the space of being controlled by different base station.For example, return to Fig. 2, first sector with the frame format of the upper figure that writes base station A is equipped in a base station (recording with black quadrangle in Fig. 3) with second sector with the frame format (frame format) of figure below of writing base station B.In each sector, use flexibly " f1 ", " f2 ", " f3 " these three frequencies, reduce the interference being subject to from adjacent base station.If by Fig. 2 and Fig. 3 explanation that is mapped, f1 is the region representing with symbol 403 in the upper figure of Fig. 2, f2 is the region representing with symbol 404 in the upper figure of Fig. 2, and f3 is the region representing with symbol 405 in the upper figure of Fig. 2.
[non-patent literature] 3GPP TS36.4238.3.1 chapter Load Indication
Described segmentation method, by each sector is separated to frequency of utilization, has the strong character of interference performance of anti-adjacent minizone.But, owing to band system band being divided into three sections, therefore, the band limiting that can utilize, therefore, throughput of system reduces.On the other hand, in the situation that not carrying out segmentation, at cell boarder, large interference can be produced, still large throughput cannot be reached.
The number of terminals that is present in the subordinate of a base station has deviation according to base station difference.For example, at main terminating machine (terminal), the density of population is very high, but its periphery is not necessarily so.As a result, covering the base station of main terminating machine and covering in the base station of main terminating machine periphery, the number of terminals that is present in base station subordinate produces very large poor.Under such situation, in order to realize the fairness (fairness) of each terminal, the base station of main terminating machine periphery is preferably to the peripheral base station declaration that comprises the base station that covers main terminating machine: carry out described segmentation the use of the Radio Resource of restriction (from Is-dated) a part of frequency band voluntarily; And in the frequency band lessen any interference that has limited voluntarily the use of Radio Resource.In the wireless communication system of a part of new standard specification, such interface (for example Load Indication of non-patent literature 1) has been installed.But, do not there is such interface in addition and the wireless communication system of the standard specification that started to use.In such system, also need to realize the means that the interference between base station reduces.
Summary of the invention
In order to solve above-mentioned problem, in the present invention, a kind of wireless communication system is provided, it comprises a plurality of radio base station apparatus that wireless signal after modulating by OFDM and terminal communicate, base station has the function of selecting the either party of not segmentation communication in communicating by letter with segmentation, described not segmentation communication is to use the band system band that all can use in wireless communication system to communicate being connected to more than one terminal of base station, described segmentation communication pattern is to use at least one dividing frequencyband in the frequency band that band system band is divided into a plurality of frequency bands and obtains to communicate being connected to an above terminal of base station,
Described wireless communication system is used as preferential frequency band to a dividing frequencyband in each base station assigns dividing frequencyband in a plurality of base stations in advance,
Each base station in base station, in the transmission path estimating circuit having in base station, measure noise power and the interference power sum of uplink, according to this value and predefined first threshold are compared to the result obtaining, select not segmentation communication or used the segmentation communication of preferential frequency band, thereby communicate with described terminal.
In addition, each base station in base station has the memory portion that carries out storehouse to sending to the data of terminal, and monitor to the storehouse amount of the queue of memory portion, this storehouse amount and predefined Second Threshold are compared, when storehouse amount is more than Second Threshold, regardless of by up noise power and interference power and compare with predefined first threshold and result, all select not segmentation communication.
In addition, whether judgement is preferential frequency band to the resource of each terminal distribution, the modulation coding mode using while switching transmission according to its result of determination.
Now, as considering and using, again send the modulation coding mode of controlling, select higher modulation coding mode.
According to the present invention.Between base station, even if utilization of resources situation is not separately communicated, crowded state around also can independently be held according to the increase and decrease of disturbing in each base station, and to utilizing, does not still utilize segmentation method automatically to control accordingly, can reduce the interference between base station.
Accompanying drawing explanation
Fig. 1 means the figure of the structure of general mobile body communication system.
Fig. 2 is the figure that has applied the allocation example of the unlimited resources in the base station of the reduction interference method based on segmentation method.
Fig. 3 is the figure that the resource allocation example to having applied between a plurality of base stations in the situation of the reduction interference method based on segmentation method describes.
Fig. 4 means the figure of the structure example of the base station in the first embodiment of the present invention.
Fig. 5 is the figure of an example of the frequency resource allocation in the explanation first embodiment of the present invention.
Fig. 6 is the figure of an example of the frequency resource allocation in the explanation first embodiment of the present invention.
Fig. 7 is the flow chart of unused/crowded method of the judgement adjacent base station in the explanation first embodiment of the present invention.
Fig. 8 is the opening of the segmentation of explanation in the first embodiment of the present invention (on)/the close flow chart of (off) changing method.
Fig. 9 is the flow chart of the decision method of the modulation coding mode in the explanation first embodiment of the present invention.
Figure 10 is for the figure of the decision logic that the opening/closing of the segmentation of second embodiment of the invention switches is described.
Symbol description
100: core side device
101～103: base station
104: terminal
201:RF portion
202:CPE portion
203:FFT portion
204:DMX portion
205:CE portion
206:MLD portion
207:DEC portion
208:DEM portion
209:MOD portion
210:Pilot generating unit
211:MUX portion
213:IFFT portion
214:CPI portion
215:DSP portion
216: network interface portion
219: control channel MOD portion
220: memory.
Embodiment
[embodiment 1]
Use Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9 to describe the first embodiment of the present invention.
Fig. 4 means the figure of the structure example of the base station in the first embodiment of the present invention.
Fig. 5 is the figure of an example of the frequency resource allocation in the explanation first embodiment of the present invention.
Fig. 6 is the figure of an example of the frequency resource allocation in the explanation first embodiment of the present invention.
Fig. 7 is that explanation in the first embodiment of the present invention is the flow chart of unused or crowded determination methods for what judge adjacent base station.
Fig. 8 is the flow chart of the opening/closing changing method of the segmentation in the explanation first embodiment of the present invention.
Fig. 9 is the flow chart of the decision method of modulating-coding (the MCS:Modulation andCoding Scheme) mode in the explanation first embodiment of the present invention.
Fig. 4 has meaned the structure example of the base station 101 of OFDMA (Orthogonal Frequency Division Multiple Access).
The computing (flow process) relevant with " unused/crowded judgement of adjacent base station ", " the utilizing the determining of resource (the opening of segmentation (on)/close determining of (off)) ", " MCS determines " that become the feature of the first embodiment of the present invention is by DSP (the Digital Signal Processor: digital signal processor) 215 carry out specific implementation of base station.
First, use Fig. 4 to describe the reception & disposal of base station.
The antenna reception of base station to signal from left side, be input to RF portion 201, and by signal amplify, the processing such as down-conversion (down convert) processing, analog-digital conversion, convert the digital signal of base band frequency band to.In base station, fixing timing is removed CP in CPE (Cyclic Prefix Extraction) portion 202 to have carried out the signal after digital conversion.So-called CP is writing a Chinese character in simplified form of Cyclic Prefix (Cyclic Prefix), and CP postpones the impact of ripple and additional in order to eliminate.In CPE portion 202, delete its CP, carry out for implementing FFT (Fast Fourier Transform: the pre-treatment of fast Fourier transform) processing.The reception signal of having removed CP is implemented FFT in FFT portion 203.By FFT, process, the signal of time domain is converted into frequency domain and becomes the information of each subcarrier.In DMX (Demultiplexing) portion 204, receive signal and be identified as the information with after frequency * time-division, and according to the determined resource of the scheduler by specializing, distribute the decomposition of carrying out channel in DSP portion 215.Mainly be divided into pilot signal (pilot signal), control signal and user data signal.Here, (Channel Estimation: channel estimating) portion 205, for inferring of transmission path to be sent to CE for pilot signal (or reference signal (reference signal)).In addition, in CE portion 205, in the timing of not specifying up channel (assign), or from DSP portion 215, receive the information of frequency, by measuring the received power of its resource, can measure the add up power of interference+thermal noise of obtaining of the thermal noise that the interference of the terminal from being connected with adjacent base station and base station self are had.Its result is reported to DSP portion 215.DSP portion 215 by report result store in memory portion 220.
Control signal is sent to DEM (Demodulation) portion 208, result is inferred in the transmission that use calculates by CE portion 205, use MMSE (Minimum Mean Square Error: least-mean-square error algorithm) or similarly method is carried out demodulation, carry out transmission path coding decoding.The information of sending from terminal as control signal, include: CINR, the received signal power RSSI (received signal strength Received Singal Strength Indication or Indicator) of the corresponding base station that whether successfully the grouping that represents downgoing line transmit ACK/NACK, measure by terminal, take and switch the incoming level etc. of the adjacent base station that (handover) is object.The such control information obtaining by demodulation is stored in the memory portion 220 of DSP portion 215, and in DSP portion 215, the interior scheduler of having specialized is used as supporting (support) information.
User data signal is sent to MLD, and (Maximum Likelihood detection: Maximum Likelihood Detection) portion 206 is used the transmission path calculating by CE portion 205 to infer result and carries out MLD.The log-likelihood ratio calculating by MLD portion 206 is imported into DEC (Decoding: decoding) in portion 207, and strengthen (turbo) decoding processing by DEC portion 207.The information obtaining is imported in DSP portion 215, after having implemented the processing of L2 (layer 2), through network interface 216, sends to the core side device that there is no record here.
Next, use Fig. 4 to describe the transmission processing of the base station being formed by the present invention.
The information of sending from core side device is recorded to memory 220 through network interface 216.Here the traffic of storehouse (the storehouse amount of queue) is held by DSP portion 215 by monitoring arrangement.By at the interior specific scheduler of DSP portion 215, implement suitable resource and distribute, according to its result, carry out modulation treatment and send from antenna.The user data information that enters into memory 220 is removed by the indication of scheduler, and by MOD (Modulation) portion 209, strengthens that the codings such as coding (turbo coding), interweave (interleave) are processed and to the modulation treatment of QPSK coding etc.Information exchange after modulation is crossed MUX portion 211 and is configured to by the indicated resource of scheduler.Now, the control channel that the pilot tone (pilot) that pilot tone generating unit 210 generates and control channel modulation portion 219 generate is configured together.Control channel by by DSP portion 215 information generateds, by control channel modulation portion 219, carry out modulation treatment and obtain.The transmission information exchange that integration is got up by MUX (Multiplexinf) portion 211 is crossed IFFT (Inverse FFT) portion 213 and is switched to time domain.Then, by the additional CP of CPI (Cyclic Prefix Insertor) portion 214, be then input to RF (Radio Frequency) portion 201.The conversion of implementing in RF portion 201 from digital signal to high-frequency signal is amplified, and outputs to the antenna of not recording in figure.
In the present invention, base station apparatus carries out HARQ (Hybrid ARQ (Automatic ReportRequest) transmission.In HARQ sends, in the situation that ack signal does not arrive from terminal, think and in reception, produced packet error, carry out the transmission again of same information.Terminal remains to the information of the soft decision state till decoding, and when again sending, the information during as above-mentioned soft decision is carried out addition process.At this moment, because the information receiving is in the past used as soft decision state, be added, therefore, when again sending, as likelihood score information, can be increased to reliable information, can improve packet error probability.If use this technology, even the low environment of CINR, by repeatedly again sending and can obtain diversity (diversity) gain, just can make the transmission success of grouping soon.By using HARQ, the CIR of requirement is high, but occurs coded system high-throughput, high MCS by selection conversely speaking,, and the coding of more intensive (aggregative), also can send.For example, with respect to QPSK1/2,64QAM5/6 can be described as the more coded system of crypto set.
The figure in the region of downlink resource distribution is carried out in Fig. 5 or Fig. 6 explanation.Utilize determining of resource to be born by the interior specific scheduler of DSP portion 215 of Fig. 4.Here, to corresponding base station, be that A describes.Up resource is sent out by time-division or frequency division, and still, effect of the present invention does not also rely on the method.Here, as example, take by time the situation of assigning to send describe as example.In the situation that being the time-division, with different time bands, sending uplink information from the time shown in Fig. 5,6.Base station manages the time band of uplink and downlink and in the information that should send the frame shown in descending timed sending Fig. 5,6.In Fig. 5,6, corresponding base station sends control information by region 401, by region 413, sends user data.Pilot signal is dispersed in 401,413,403 regionals, thereby the transmission path that can carry out following frequency change or time fluctuation is inferred.
Fig. 5 be corresponding base station and the adjacent base station traffic thereof all a lot, be judged to be the resource of selecting in crowded situation and distribute.
In corresponding base station A, only 1/3 the fill area (hatch area) (413) of becoming in the frequency band of 10MHz is carried out to resource distribution.In adjacent base station B, only to becoming 1/3 fill area (513), carry out resource distribution too.In base station A and B, at common signal channel, implement segmentation, can be not interfering with each other.
Fig. 6 be the corresponding base station traffic many, but the traffics of adjacent base station are few, be judged to be the resource of selecting in the situation of unused state and distribute.
In the A of this base station, use the fill area (414) of the frequency band that becomes whole 10MHz to carry out resource distribution.But in resource is distributed, in the region (420) except surrounding with thick frame and the part region 414, the establishing method of MCS is different.First, about the region surrounding with thick frame, as shown in the figure, in the situation that moving under segmented model, do not disturb base station B.Therefore, even if select higher MCS to send, can not cause garble yet.This frequency is called to preferential frequency band.That is, there is such structure: base station A selects the control of high MCS in becoming the frequency of preferential frequency band, and the information of the CINR that report according to terminal in becoming the frequency of preferential frequency band other base stations is determined MCS.
Fig. 7 is that explanation judges that adjacent base station is the flow chart of unused or crowded method.
This flow process is kept in DSP portion 215.This flow process is implemented in suitable timing in base station, and it is unused or crowded judging around.Timing as carrying out unused, the crowded judgement of this adjacent base station, has surpassed the situation of predetermined threshold value etc. such as the traffic that can consider predetermined cycle, base station.As previously mentioned, in CE portion 205, the information of distributing according to the ascending resource from DSP portion 215, uses the terminal being connected with base station not have the resource sending to measure interference power+thermal noise power.Wherein, due to the present invention and do not rely on the assay method of interference+thermal noise power, therefore, can be also that interference+thermal noise power of the linear interpolation that utilizes additive method, for example infer based on transmission path is measured constant power assay method, measure the interference+thermal noise power measurement result obtaining.The result recording is reported to DSP portion 215.In program in DSP portion 215, in the step 701 of Fig. 7, read the measurement result of interference+thermal noise power.
In following step 702, measurement result and threshold value are compared to judgement.Compare with threshold value, in the situation that measured value is large, think very large from the interference of terminal that is connected in peripheral base station, therefore, the upstream traffic that is speculated as adjacent base station is crowded.Owing to being difficult to think that only uplink communication circuit is crowded, therefore, certainly think descending also crowded.Consequently be judged to be base station crowded (step 704) around, otherwise, in the situation that measured value and threshold are little, think that interference is very little, the upstream traffic that is speculated as successively adjacent base station is unused state.Equally, thinking descending is also unused (step 703).Like this, according to up interference+thermal noise, measure, can judge that adjacent base station is unused state or crowded.
Fig. 8 is that explanation is the flow chart that unused state or crowded result of determination change the method for scheduling according to adjacent base station.
This flow process is kept in DSP portion 215.
First, in step 801, according to the result of Fig. 7, judge that whether unused adjacent base station is.Being judged to be unused in the situation that, advance to step 803, all subchannels of take are implemented resource as object and are distributed (enforcement segmentation).Allocation example is now the distribution method of Fig. 6.In addition, in step 801, being judged to be not unused in the situation that, advance to step 802, the preassigned subchannel of take implements to distribute (enforcement segmentation) as object.Allocation example is now the distribution method of Fig. 5.By unused or crowded judgement that illustrated in such Fig. 7, adjacent base station, can realize the structure of the distribution method of adjustresources independently.Thus, solved technical task.
Fig. 9 is the flow chart of an example of definite method of explanation MCS.
This flow process is kept in DSP portion 215.For each resource, carry out resource distribution.Here, specify the resource of distributing and the terminal that becomes communication object to describe.First, in step 910, judge whether respective resources is preferential frequency band.In the situation that being preferential frequency band, advance to step 912, the CINR value from terminal report is determined to MCS with skew (offset) phase Calais.Skew have on the occasion of, by adding skew, CINR report value is improved.CINR report value is measured and is obtained by pilot tone or lead code by terminal.Terminal reports CINR as broadband character, terminal in the situation that the characteristic of not knowing specific subcarrier because interference is avoided being enhanced and reported.Therefore,, by adding the skew due to not having to disturb, revise poor between report value and reality.
Here, be envisioned for: other adjacent base stations are difficult to, by segmentation, corresponding preferential frequency band is implemented to resource and distribute.Therefore, expect to realize high CINR.But segmentation is not likely carried out in other base stations yet, therefore expect the action of above-mentioned HARQ.That is, by CINR, be that the good correct MCS of hypothesis carries out signal transmission, in the situation that hypothesis is correct, terminal successfully receives.In the incorrect situation of hypothesis, because terminal can not receive successfully, therefore, terminal starts NACK signal to base station.The transmission again based on HARQ is carried out in the base station that receives this signal, again sends the grouping sending by high MCS.In terminal, by soft decision level, the grouping first receiving and the new grouping again sending are synthesized to the processing of then decoding.By this action, can obtain diversity gain, even the signal sending by high MCS, also can be by successfully sending grouping by a plurality of resources that again send.
On the other hand, in step 901, being judged as be not preferential frequency band in the situation that, advance to step 902, directly use from the CINR value of terminal report and determine MCS.By like this, carry out the report value of self terminal, do not change, can, by the correction of base station side, assign the MCS that has considered whether to have disturbed possibility.Thus, can technical solution problem.
The skew illustrating in the subchannel pre-establishing illustrating in that illustrated in Fig. 7 and the threshold value comparison of interference+thermal noise power, Fig. 8 and Fig. 9 is all the value from the appointment of core side device.Also can specify different values to each base station.In addition, in sector strucre, be placed in that a plurality of base stations in same place are designated to be become segmentation each other can be capped by subchannel arrangements.
According to the present invention, by the preferential frequency band of base station sets, manufacture idle resource and do not manufacture idle resource and preset.Base station monitors the interference of the terminal from being connected with adjacent base station, and under the situation of disturbing higher than the threshold value of setting separately, the traffic that is judged as adjacent base station is high, and restriction distributes manufacturing the resource of idle resource voluntarily.Only utilize and do not manufacture idle resource and carry out resource distribution.
; each base station is arranged the idle resource of predefined easy manufacture and do not manufacture idle resource, by up interference measurement, independently control resource and distribute, in the situation that it is crowded to be judged as the resource of adjacent base station; specific resource is produced idle, transfer to segmented model.Otherwise in the situation that it is unused to be judged as the resource of adjacent base station, as not segmented model work, the control of carrying out resource distribution makes to use all resources to communicate.
What at Fig. 7, illustrated is in unused or crowded judgement, be not that once mensuration to implement in step 701 is determined judgement, but judged afterwards a plurality of measurement results are carried out to rolling average, thus, the deviation that can suppress result of determination, carries out stable action.
In above-mentioned Fig. 5, Fig. 6, utilize channel arranged side by side in logic to show Radio Resource.Actual physical channel side by side in, there is scramble (scramble) (or displacement (permutation)).Even in this case, be also the meaning of frequency conflicts, the character arranged side by side in logic illustrating in this specification is constant.Therefore, even in the situation that replacing, also within the category of this patent.
[embodiment 2]
In the first embodiment of the present invention, only by measuring the disturbing wave from peripheral base station, determine it is that the scope that the resource of corresponding base station is distributed is carried out segmentation, or utilize Whole frequency band to send and do not carry out like this segmentation.
But in the situation that the traffic in the descending transmit queue of corresponding base station is a lot, if carry out segmentation, the stock number that can distribute reduces, and therefore, may not necessarily do the trick when storehouse.Therefore, the traffic to storehouse in the down queue of corresponding base station is obtained summation, this summation and predetermined threshold value is compared, in the situation that summation is greater than threshold value, the all subchannels of use that carry out as shown in Figure 6 send, and this is the feature of the present embodiment.But, now, use the CINR report of self terminal, to the poor terminal of descending CINR,, be considered to be positioned at the preferential frequency band of terminal distribution of cell boarder.Outside preferential frequency band, although can be subject to the interference from other communities, if be positioned near terminal base station, be predicted as from the interference of other communities very lowly, can carry out based on take the communication of high CINR as basic high MCS.
At storehouse, in the situation that the traffic total amount in the down queue of corresponding base station is very little, as in the first embodiment shown, according to the interference volume from other base stations, determines and carry out segmentation or utilize Whole frequency band to send.
Figure 10 is for the figure of the decision logic that the opening/closing of the segmentation of one embodiment of the present of invention switches is described.
The traffic of Zhou Duizhe community, left and right is compared large or little the classification with threshold value.In addition, upper and lower axle is large or little the classification to the interference from other communities.First, the traffic of judgement corresponding base station, in the situation that being greater than threshold value, is defined as utilizing Whole frequency band to send.In the situation that the traffic of corresponding base station is less than threshold value, as next step, judge the interference from other communities, according to the size of disturbing, determine whether segmentation.Here, while being greater than threshold value from the interference of other communities, carry out segmentation.In addition, when the interference from other communities is less than threshold value, utilize Whole frequency band to send.
By above-mentioned control, even in the situation that the traffic of community is high, also can consider and the interference of other communities in carry out the interference that connection is taken between base station and control.Solved thus technical task.
The skew illustrating in the subchannel pre-establishing illustrating in that illustrated in Fig. 7 and the threshold value comparison of interference+thermal noise power, Fig. 8, Fig. 9 and use Figure 10 that the threshold value that the traffic of Guo Yu community compares is described is all the value from the appointment of core side device.Also can specify different values to each base station.In addition, in sector strucre, be placed in that a plurality of base stations in same place are designated to be become segmentation each other can be capped by subchannel arrangements.
Claims (9)
1. a wireless communication system, it comprises a plurality of radio base station apparatus that wireless signal after modulating by OFDM and terminal communicate, it is characterized in that,
Described wireless communication system has Whole frequency band communication pattern and partial-band communication pattern, described Whole frequency band communication pattern is used the band system band that all can use in wireless communication system to communicate being connected to more than one terminal of described radio base station apparatus, described partial-band communication pattern is used at least one dividing frequencyband in the frequency band that described band system band is divided into a plurality of frequency bands and obtains to communicate being connected to an above terminal of described radio base station apparatus
Described wireless communication system distributes a dividing frequencyband in described dividing frequencyband to be used as preferential frequency band to each radio base station apparatus in described a plurality of radio base station apparatus in advance,
Each radio base station apparatus in described radio base station apparatus, in the transmission path estimating circuit having at radio base station apparatus, measure noise power and the interference power sum of uplink, when this value is greater than first threshold, the partial-band communication pattern of described preferential frequency band has been used in employing, in this value for first threshold is when following, adopt described Whole frequency band communication pattern, communicate with the terminal that is connected to described radio base station apparatus.
2. wireless communication system according to claim 1, is characterized in that,
Each radio base station apparatus in described a plurality of radio base station apparatus has the memory portion that carries out storehouse to sending to the data of described terminal, and monitor to the storehouse amount of the queue of this memory portion, this storehouse amount and predefined Second Threshold are compared, when storehouse amount is more than Second Threshold, in the transmission path estimating circuit having at radio base station apparatus, measure noise power and the interference power sum of uplink, regardless of this value and predefined first threshold are compared result, all select to send by described Whole frequency band communication pattern.
3. wireless communication system according to claim 2, is characterized in that,
Described wireless communication system has the core apparatus of controlling described a plurality of radio base station apparatus, and this core apparatus is notified described preferential frequency band and/or described first threshold and/or described Second Threshold to described a plurality of radio base station apparatus.
4. a radio base station apparatus, its wireless signal and terminal after modulating by OFDM communicates, it is characterized in that,
Described radio base station apparatus has Whole frequency band communication pattern and partial-band communication pattern, described Whole frequency band communication pattern is used the band system band that all can use in wireless communication system to communicate being connected to more than one terminal of described radio base station apparatus, described partial-band communication pattern is used at least one dividing frequencyband in the frequency band that described band system band is divided into a plurality of frequency bands and obtains to communicate being connected to an above terminal of described radio base station apparatus
In described radio base station apparatus, preset preferential frequency band and be used as the frequency band using in described partial-band communication pattern,
Described radio base station apparatus is measured noise power and the interference power sum of uplink in transmission path estimating circuit, when this value is greater than first threshold, the partial-band communication pattern of described preferential frequency band has been used in employing, in this value for first threshold is when following, adopt described Whole frequency band communication pattern, communicate with the terminal that is connected to described radio base station apparatus.
5. radio base station apparatus according to claim 4, is characterized in that,
Described radio base station apparatus has the memory portion that carries out storehouse to sending to the data of described terminal, and monitor to the storehouse amount of the queue of this memory portion, this storehouse amount and predefined Second Threshold are compared, when storehouse amount is more than Second Threshold, in the transmission path estimating circuit having at radio base station apparatus, measure noise power and the interference power sum of uplink, regardless of this value and predefined first threshold are compared result, all select to send by described Whole frequency band communication pattern.
6. according to the radio base station apparatus described in claim 4 or 5, it is characterized in that,
Whether the resource that each terminal is distributed in the judgement of described radio base station apparatus is predefined preferential frequency band, and is chosen according to the reception signal quality of its judged result and terminal the modulation coding mode using while sending.
7. radio base station apparatus according to claim 6, is characterized in that,
When the resource of distributing to described terminal is predefined preferential frequency band, select the more coding of crypto set.
8. for the wireless communications method of wireless communication system, this wireless communication system comprises a plurality of radio base station apparatus that wireless signal after modulating by OFDM and terminal communicate, and this wireless communications method is characterised in that,
Described wireless communications method has Whole frequency band communication pattern and partial-band communication pattern, described Whole frequency band communication pattern is used the band system band that all can use in wireless communication system to communicate being connected to more than one terminal of described radio base station apparatus, described partial-band communication pattern is used at least one dividing frequencyband in the frequency band that described band system band is divided into a plurality of frequency bands and obtains to communicate being connected to an above terminal of described radio base station apparatus
In described wireless communications method, to each radio base station apparatus in described a plurality of radio base station apparatus, distribute a dividing frequencyband in described dividing frequencyband to be used as preferential frequency band in advance,
Each radio base station apparatus in described radio base station apparatus, measure noise power and the interference power sum of uplink, when this value is greater than first threshold, the partial-band communication pattern of described preferential frequency band has been used in employing, in this value for first threshold is when following, adopt described Whole frequency band communication pattern, communicate with the terminal that is connected to described radio base station apparatus.
9. wireless communications method according to claim 8, is characterized in that,
Each radio base station apparatus in described a plurality of radio base station apparatus monitors the traffic that sends to described terminal, this traffic and predefined Second Threshold are compared, when the traffic is more than Second Threshold, regardless of the measurement result of the noise power of uplink and interference power and predefined first threshold are compared result, all select to send by described Whole frequency band communication pattern.
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| JP2010041283A JP5372806B2 (en) | 2010-02-26 | 2010-02-26 | Wireless base station, wireless communication system, and wireless communication method |
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| JP5878752B2 (en) * | 2011-12-22 | 2016-03-08 | 京セラ株式会社 | Wireless terminal and wireless communication system |
| CN104145494B (en) * | 2012-07-18 | 2018-11-13 | 华为技术有限公司 | Frequency spectrum distributing method and equipment |
| CN103888175B (en) * | 2012-12-19 | 2015-11-18 | 钰宝科技股份有限公司 | For the quick connecting method of wireless communication system |
| CN107306422B (en) * | 2016-04-25 | 2021-06-25 | 西门子公司 | Method and device for congestion detection |
| WO2019051811A1 (en) * | 2017-09-15 | 2019-03-21 | Oppo广东移动通信有限公司 | Method for configuring frequency priority, terminal device, base station, and core network device |
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| CN1946208A (en) * | 2005-10-05 | 2007-04-11 | 三洋电机株式会社 | Radio base station, communications program and communications method |
| JP3964855B2 (en) * | 2003-11-07 | 2007-08-22 | 株式会社東芝 | Wireless communication system, wireless control method, control device, and terminal device |
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| JP2011523313A (en) * | 2008-06-17 | 2011-08-04 | エヌイーシー ヨーロッパ リミテッド | Subcarrier allocation method and network in OFDMA communication network |
| US8761824B2 (en) * | 2008-06-27 | 2014-06-24 | Qualcomm Incorporated | Multi-carrier operation in a wireless communication network |
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| JP3964855B2 (en) * | 2003-11-07 | 2007-08-22 | 株式会社東芝 | Wireless communication system, wireless control method, control device, and terminal device |
| CN1946208A (en) * | 2005-10-05 | 2007-04-11 | 三洋电机株式会社 | Radio base station, communications program and communications method |
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| JP2011181994A (en) | 2011-09-15 |
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