CN101442752A - Method and apparatus for controlling interference between neighboring districts in base station and user terminal - Google Patents
Method and apparatus for controlling interference between neighboring districts in base station and user terminal Download PDFInfo
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Abstract
The invention provides a scheme for controlling intercell interference in base station of wireless communication network. Every cell is allocated with a specific interweaving pattern based on subblock frequency multiplexing; adjacent cells is provided with different interweaving pattern; a user terminal of every cell uses the specific interweaving pattern of the cell for processing uplink signal. The invention relieves intercell interference and effectively promoting communication quality of wireless communication by allocating different interweaving pattern to different user terminal of every adjacent cells based on subblock frequency multiplexing. When strong intercell interference occur, base station can utilize interweaving pattern of adjacent cells for deinterlacing the interfered signal to determine interference source, then regulates corresponding frequency resource, effectively promotes wireless communication system performance.
Description
Technical field
The present invention relates to base station and user terminal in the communication network, relate in particular to and be used to control method and the device that disturbs between neighbor cell in base station and the user terminal.
Background technology
Disturb (Inter cell interference between neighbor cell, ICI) be an intrinsic problem of cell mobile communication systems, being used to of studying at present suppresses the technology that the minizone suppresses and mainly contains two classes: interference coordination (ICI coordination) and interference randomization (ICIrandomization).
The basic skills of interference randomization is with the presence of intercell interference randomization, and this method can not reduce the energy of interference, but can be " white noise " with interference randomization, thereby suppresses the harm of presence of intercell interference, therefore is called again " interference whitening ".The method of interference randomization comprises: 1) different districts adopts different scramblers (Cell-specific scrambling); 2) different districts adopts different interweaving (Cell-specific interleaving); 3) different districts adopts different frequency hopping frequency sequences (Frequency hopping).The performance of above-mentioned three kinds of methods is similar, all is difficult to obtain satisfactory performance and improves.Adopting different interweaving with different minizone is example, and the number of users of the treatable interference of this method only limits to 2 to 3, if cause the user of interference to reach 6, under worst case, Signal Interference and Noise Ratio only is-7.7815 (101g6).Therefore, interference randomization can not be used alone as the method that suppresses presence of intercell interference usually.
Usually, interference coordination is to carry out between neighbor cell, to avoid or to reduce ICI.Interference coordination is actually by adopt piecemeal channeling (FFR at cell edge, FractionalFrequency Reuse) realizes, IEEE 802.20 recently selected technical scheme QFDD/QTDD have just adopted this technology, and LTE is also considering this method.
The principle of piecemeal channeling is that system's available frequencies resource division is become several set, can use whole set at the user terminal of center of housing estate, and the user terminal that is arranged in different neighbor cells edge uses the different sets of several set.The piecemeal channeling can suppress presence of intercell interference effectively.But, because also can there be stronger presence of intercell interference in increasing and mobile subscriber's fast moving of mobile subscriber usually.Along with the mobile subscriber is more and more higher to the requirement of communication quality, how reduces presence of intercell interference effectively and become a problem that presses for solution.
Summary of the invention
The present invention is in order to solve above-mentioned shortcoming of the prior art, a kind of method that is used to control presence of intercell interference in wireless communication network base station has been proposed, by being specific interlacing pattern of each cell allocation on the basis of using the piecemeal channeling in each sub-district, the interlacing pattern of neighbor cell is different mutually, and the user terminal in each sub-district uses the specific interlacing pattern in this sub-district that upward signal is carried out interleaving treatment.
According to a first aspect of the invention, a kind of method of disturbing between neighbor cell that is used to control in wireless communication network base station is provided, at first the base station is according to the frequency resource allocation relevant information from user terminal in this jurisdiction district, base station, for described user terminal distributes the correspondent frequency resource; Base station transmission frequency resource notification message is given described user terminal then, adopts corresponding frequency resource and this base station to communicate to notify described user terminal; And the base station is also according to first predetermined condition, and transmission interweaves notification message to described user terminal, adopts the specific interlacing pattern in this jurisdiction district, base station and this base station to communicate to notify described user terminal.
According to a second aspect of the invention, provide a kind of Interference Control device that disturbs between neighbor cell that is used to control in wireless communication network base station, this Interference Control device comprises resource allocation device and dispensing device.Resource allocation device is according to the frequency resource allocation relevant information from user terminal in this jurisdiction district, base station, for described user terminal distributes the correspondent frequency resource; Dispensing device transmission frequency resource notification message is given described user terminal, adopts corresponding frequency resource and this base station to communicate to notify described user terminal; And dispensing device is according to first predetermined condition, and transmission interweaves notification message to described user terminal, adopts the specific interlacing pattern in this jurisdiction district, base station and this base station to communicate to notify described user terminal.
According to a third aspect of the invention we, a kind of method of disturbing between the assist control neighbor cell of being used in the user terminal of cordless communication network is provided, at first user terminal receives the frequency resource notification message from affiliated base station, and this frequency resource notification message is used for notifying this user terminal with base station under described for the frequency resource that this user terminal distributes; User terminal communicates with this base station on the frequency resource of described affiliated base station assigns according to described frequency resource notification message then; And user terminal also receives the notification message that interweaves from base station under described, and interlacing pattern that this notification message that interweaves is used to notify this user terminal to adopt and described affiliated jurisdiction district, base station is specific and described affiliated base station communicate; User terminal is according to the described notification message that interweaves then, and specific interlacing pattern and this base station in employing and this described affiliated jurisdiction district, base station communicates.
According to a forth aspect of the invention, provide a kind of auxiliary Interference Control device of disturbing between the assist control neighbor cell of being used in the user terminal of cordless communication network, this Interference Control device comprises receiving system and control device.Receiving system receives the frequency resource notification message from affiliated base station, and this frequency resource notification message is used for notifying this user terminal with base station under described for the frequency resource that this user terminal distributes; Control device is controlled this user terminal and is communicated with this base station on the frequency resource of described affiliated base station assigns according to described frequency resource notification message then; And receiving system also receives the notification message that interweaves from base station under described, and interlacing pattern that this notification message that interweaves is used to notify this user terminal to adopt and described affiliated jurisdiction district, base station is specific and described affiliated base station communicate; Control device is controlled interlacing pattern and this base station that this user terminal adopts and this described affiliated jurisdiction district, base station is specific and is communicated according to the described notification message that interweaves then.
The present invention is by be that user terminal in each neighbor cell distributes different interlacing patterns on the basis of piecemeal channeling, thereby feasiblely further alleviated presence of intercell interference, improved the communication quality of radio communication effectively.Because the different interlacing pattern that has been different cell allocation, when producing stronger presence of intercell interference, the base station can utilize the interlacing pattern of neighbor cell to come being subjected to the interference signals deinterleaving, thereby determine interference source, handle to carry out the adjustment of correspondent frequency resource, improved the performance of wireless communication system effectively.
Description of drawings
By reading the following detailed description of non-limiting example being done with reference to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.
Fig. 1 is the schematic diagram according to piecemeal channeling of a specific embodiment of the present invention and interlacing pattern distribution;
Fig. 2 is the schematic diagram according to the piecemeal channeling of another embodiment of the present invention and interlacing pattern distribution;
Fig. 3 sends the notification message that interweaves to the flow chart of user terminal to notify the specific interlacing pattern in this user terminal employing and this jurisdiction district, base station and this base station to communicate for being used in wireless communication network base station according to a specific embodiment of the present invention according to first predetermined condition;
Fig. 4 is according to the functional block diagram of a specific embodiment of the present invention at the transmitter of the user terminal of cordless communication network;
Fig. 5 is the frequency resource allocation schematic diagram according to the piecemeal channeling of a specific embodiment of the present invention;
Fig. 6 is for being used to control the structured flowchart of the Interference Control device that disturbs between neighbor cell in wireless communication network base station according to a specific embodiment of the present invention;
Fig. 7 is for being used for the structured flowchart of the auxiliary Interference Control device that disturbs between the assist control neighbor cell in the user terminal of cordless communication network according to a specific embodiment of the present invention.
In the accompanying drawings, identical with similar Reference numeral is represented same or analogous device or method step.
Embodiment
Fig. 1 shows the schematic diagram according to the piecemeal channeling of the cordless communication network of a specific embodiment of the present invention and interlacing pattern distribution.
As shown in fig. 1, suppose the regular hexagon that is shaped as of sub-district that each base station is had jurisdiction over, suppose that F1+F2+F3 is the available frequencies resource collection, F1, F2, F3 is mutual nonoverlapping frequency resource set, the user terminal that is positioned at each center of housing estate can use whole frequency resources, the user terminal that is arranged in base station 10 the 1st sub-district C1 edge that has jurisdiction over only uses the frequency resource of F1 set, be positioned at the 2nd, 4,6 sub-district C2, the user terminal of C4 and C6 edge only uses the frequency resource in the F2 set, is positioned at the 3rd, 5,7 sub-district C3, the user terminal of C5 and C7 edge only uses the frequency resource in the F3 set.The interlacing pattern that is assumed to be the 1st sub-district C1 distribution is labeled as I1, is that the interlacing pattern that the 2nd sub-district C2 distributes is labeled as I2, by that analogy, is that the interlacing pattern that the 7th sub-district C7 distributes is labeled as I7.I1, I2, I3, I4, I5, I6 and I7 are mutually different interlacing pattern.
In piecemeal channeling schematic diagram shown in Figure 1, base station 10 is that user terminal 20 distributes the correspondent frequency resource according to the frequency resource allocation relevant information from user terminal 20 usually; And sending the frequency resource notification message to user terminal 20, the correspondent frequency resource and the base station 10 of adopting base station 10 to distribute with informing user terminal 20 communicate.Here the frequency resource relevant information comprises the signal quality of upward signal of user terminal 20 and/or the geographical location information of user terminal 20.The parameter of judging the signal quality of upward signal comprises various parameters and combination in any thereof such as Signal Interference and Noise Ratio, bit error rate, frame error rate, signal power.
Below in conjunction with Fig. 1, be that example distributes the correspondent frequency resources to be described in detail for the process of user terminal 20 to base station 10 according to signal quality from the upward signal of user terminal 20 with base station 10.
At first, base station 10 bases judge that from the signal quality of the upward signal of user terminal 20 user terminal 20 is near the center of housing estate zone of base station or at the cell edge place away from the base station.If the signal quality of the upward signal of user terminal 20 is better than the 4th preassigned, for example, the Signal Interference and Noise Ratio of the upward signal of user terminal 20 is lower than a predetermined threshold greater than a predetermined threshold and/or bit error rate, then base station 10 judges that user terminal 20 is in the center of housing estate zone near the base station, and base station 10 can distribute the frequency resource in the whole frequency resource set (F1+F2+F3) to use for user terminal 20.If the signal quality of the upward signal of user terminal 20 is worse than the 4th preassigned, then base station 10 judges that user terminal 20 is in the cell edge place away from the base station, and then the frequency resource among the dividing frequency resource collection F1 uses for user terminal 20.Here the 4th preassigned comprises one or more predetermined thresholds, and the value of each predetermined threshold depends on the various settings of actual operation system.The parameter of judging the signal quality of upward signal comprises various parameters and combination in any thereof such as Signal Interference and Noise Ratio, bit error rate, frame error rate, signal power.Particularly, how to determine that parameters such as Signal Interference and Noise Ratio, bit error rate, frame error rate, signal power should be the general knowledge that those of ordinary skills should know, the present invention repeats no more.
If user terminal 20 has a locating module, base station 10 also can be that user terminal 20 distributes the correspondent frequency resource according to the geographical position at user terminal 20 places.For example in schematic diagram shown in Figure 2, if the design of piecemeal frequency resource makes cell edge place in different directions take different frequency resources, can be directly in base station 10 then be the different frequency resources of user terminal 20 distribution according to the geographical location information of user terminal 20.
In piecemeal channeling schematic diagram shown in Figure 2, the area dividing that each base station is had jurisdiction over is three sectors, and the base station is positioned at the central authorities of three sectors.The zone that base station 10 is had jurisdiction over is divided into three sectors 101,102,103, and by that analogy, the zone that base station 16 is had jurisdiction over is divided into three sectors 701,702,703.
Suppose that F1+F2+F3 is the available frequencies resource collection, F1, F2, F3 are mutual nonoverlapping frequency resource set, and the user terminal (i.e. the 10 nearer user terminals from the base station) that is less than or equal to first threshold with the distance of base station can use whole frequency resources and base station 10 to communicate; Communicate greater than first threshold and the frequency resource and the base station 10 that are arranged in the user terminal frequency of utilization resource collection F1 of sector 101 with the distance of base station 10, communicate greater than first threshold and the frequency resource and the base station 10 that are arranged in the user terminal frequency of utilization resource collection F2 of sector 102 with the distance of base station 10, communicate greater than first threshold and the frequency resource and the base station 10 that are arranged in the user terminal frequency of utilization resource collection F3 of sector 103 with the distance of base station 10.By that analogy, for the sector that other base station is had jurisdiction over, the sector that the distribution of frequency resource is had jurisdiction over base station 10.
Is that user terminal 20 distribute the process of correspondent frequency resources be elaborated to base station 10 according to the geographical location information of user terminal 20 below in conjunction with Fig. 2.
At first, user terminal 20 utilizes the locating module of himself to obtain its geographical location information, and reports to base station 10.Base station 10 is distributed the correspondent frequency resource according to the geographical location information of user terminal 20 for it.For example, when base station 10 bases its geographical location information from user terminal 20 reports, judge that user terminal 20 is arranged in 101 sectors, and when 10 distance is greater than first threshold from the base station, then be used for communicating by letter with base station 10 for the frequency resource among the user terminal 20 dividing frequencies set F1, and the transmission frequency notification message communicates for frequency resource and base station 10 among the frequency sets F1 that user terminal 20, informing user terminal 20 be adopted as its distribution.Here the value of first threshold depends on the various settings of actual operation system too.
More than the situation of the frequency resource allocation of piecemeal channeling in the base station 10 is had been described in detail.Below base station 10 being sent the notification message that interweaves according to first predetermined condition adopts the process that communicates with specific interlacing pattern in 10 jurisdiction districts, base station and base station 10 to be elaborated to user terminal 20 with informing user terminal 20.
Whether user terminal 20 adopts the specific interlacing pattern in its residing sub-district can be divided into two kinds to the situation that upward signal carries out interleaving treatment, and promptly above-mentioned first predetermined condition comprises two kinds of situations: first kind is to be in all user terminals in certain sub-district all to adopt with the specific interlacing pattern in this sub-district upward signal is carried out interleaving treatment; Second kind is only relatively poor or from the base station of sub-district when far away, the interlacing pattern that user terminal 20 just adopts and this sub-district is specific carries out interleaving treatment to upward signal when the quality of uplink signal of user terminal 20.
Fig. 3 shows base station 10 in above-mentioned second kind of situation and sends the notification message that interweaves according to first predetermined condition and adopt the flow chart that communicates with specific interlacing pattern in 10 jurisdiction districts, base station and base station 10 to user terminal 20 with informing user terminal 20, is elaborated below with reference to Fig. 1 and Fig. 3.
At first, in step S11, the upward signal that base station 10 receives from user terminal 20.
Then, in step S12, base station 10 judges whether the signal quality of the upward signal of user terminal 20 is worse than first preassigned.For example, the Signal Interference and Noise Ratio of the upward signal of user terminal 20 is lower than a predetermined threshold greater than a predetermined threshold and/or bit error rate.First preassigned comprises one or more predetermined thresholds, the situation of the value visible system of each threshold value design and deciding.First preassigned can be identical with the 4th preassigned, also can be different.
At last, in step S13, if the signal quality of the upward signal of user terminal 20 is worse than first preassigned, then base station 10 sends the notification message that interweaves and adopts with the specific interlacing pattern I1 in 10 jurisdiction districts, base station with informing user terminal 20 to user terminal 20 upward signal is carried out interleaving treatment.
It is pointed out that in above-mentioned second kind of situation base station 10 also can judge when send the notification message that interweaves to user terminal 20 according to the user terminal 20 and the distance of base station 10.Particularly, when base station 10 detects user terminal 20 with its distance during greater than second predetermined threshold, send the notification message that interweaves and adopt with the specific interlacing pattern I1 in 10 jurisdiction districts, base station with informing user terminal 20 to user terminal 20 upward signal is carried out interleaving treatment.The situation of the setting visible system of second predetermined threshold size design equally, here and deciding.And the value of second threshold value can be identical with first threshold, also can be different.
After user terminal 20 receives the notification message that interweaves from base station 10, adopt interlacing pattern I1 that the upward signal that it sends to the base station is carried out interleaving treatment, and on the frequency resource of base station 10, the upward signal after the interleaving treatment is sent to base station 10 for user terminal 20 distribution.
Need to prove that the interleaving treatment that user terminal 20 adopts can be a Bit Interleave, also can is-symbol interweave.In addition, the mode of interleaving treatment is not limit yet, and comprises block interleaving, convolutional interleave etc.A kind of simple mode is to adopt block interleaving, promptly stores data in the mode of matrix, and data enter storage matrix line by line by the direction of row, is read by row by the direction of row, and general weaving length is about 1000-4000 bit or symbol.Along with the increase of interleaver sizes, the performance of distinguishing cell will make moderate progress, but when reaching after 4000, performance improvement is not obvious.Different interleavers can be realized by changing line number and columns, for example length is 1024 block interleavers, 64x16 can be arranged, 32x32, multiple implementation method such as 16x64 and 8x128, and emulation shows that these block interleavers are separate, can distinguish the data-signal of different districts well with them.During deinterleaving, carry out the processing of contrary with interweaving.Concrete, about interweaving, deinterleaving can be known clearly and be read list of references 1 (Li Ping, Lihai Liu, K.Y.Wu and W.K.Leung, " Interleave divisionmultiple access (IDMA) communication systems, " Proc.3rd InternationalSymposium on Turbo Codes ﹠amp; Related Topics, 2003, pp.173-180), list of references 2 (Li Ping, Lihai Liu, Keying Wu and W.K.Leung, " Approach thecapacity of multiple access channels using interleaved low rate codes; " IEEEInternational Symposium on Information Theory, ISIT ' 03, p.311) and list of references 3 (W.K.Leung, Lihai Liu and Li Ping, " Interleaving-based multipleaccess and iterative chip-by-chip multi-user detection, " IEICE Trans.onCommun., vol.E86-B, pp.3634-3637, Dec.2003), the present invention repeats no more here.
With OFDM/OFDMA system, employing Bit Interleave is example, and the functional block diagram of the transmitter module in the user terminal 20 as shown in Figure 4.After source encoding, cyclic redundancy check (CRC) code coding, carry out Bit Interleave and handle, and then carry out the channel error correction coding,, carry out symbol-modulated after this again, modulate as QAM as forward error correction.For cdma system, before symbol-modulated, also to carry out spread processing.
Preferably, base station 10 can also utilize the interlacing pattern of neighbor cell that the upward signal that receives is carried out deinterleaving and handle, and with definite interference source, thereby carries out the generation of correspondent frequency adjustment processing to avoid interference.
Particularly, as shown in Figure 1, when arranging network, the specific interlacing pattern of each jurisdiction district, base station that will be adjacent with base station 10 is stored in the base station 10 in advance in advance in operator.Base station 10 can also judge whether the signal quality from the upward signal of user terminal 20 is worse than second preassigned.
If the signal quality of user terminal 20 is worse than second preassigned, then detect the signal quality that is comprised in the upward signal from user terminal 20 from the interference signal of other user terminal in the adjacent base station region within the jurisdiction, promptly with the specific interlacing pattern of each neighbor cell the upward signal that receives being carried out deinterleaving handles, if utilize the specific interlacing pattern of certain neighbor cell the upward signal that receives to be carried out the interference signal quality of gained meets second predetermined condition after the deinterleaving, think that then certain user terminal that comes from this neighbor cell causes stronger interference to user terminal 20, handle thereby carry out the adjustment of correspondent frequency resource.
Second predetermined condition comprises that the signal quality that base station 10 utilizes the interlacing pattern of certain neighbor cell that the interference signal of back gained is handled in the upward signal deinterleaving that receives is better than the 3rd preassigned, and the signal quality of the interference signal of gained was better than with the specific interlacing pattern in 10 jurisdiction districts, base station the upward signal that receives being carried out the signal quality that the useful signal of back gained is handled in deinterleaving after perhaps deinterleaving was handled.
As shown in Figure 1, suppose that the interference of upward signal of 21 pairs of user terminals 20 of user terminal of being had jurisdiction over base station 11 is bigger.Particularly, the frequency resource adjustment is handled and to be comprised dual mode: a kind of is the frequency resource of distributing other for user terminal 20 by base station 10, so that to distribute to the upstream frequency resource of user terminal 21 inequality with base station 11, thereby avoids interference.It is as follows that another kind of frequency resource is adjusted mode: the interlacing pattern of base station 10 by utilizing 11 jurisdiction districts, base station carries out deinterleaving to the upward signal from user terminal 20 that receives to be handled the signal quality of gained and is better than the 3rd threshold value or is better than with the specific interlacing pattern in 10 jurisdiction districts, base station the upward signal from user terminal 20 that receives being carried out signal quality after the deinterleaving, determine that certain user terminal (being assumed to be user terminal 21) in 11 jurisdiction districts, base station produces bigger interference to user terminal 20, base station 10 sends adjusts notification message to base station 11, with frequency resource (being the frequency resource of the user terminal 20 current uses) informing base station 11 that will be disturbed, and informing base station 11 is carried out frequency resource adjustment processing, i.e. frequency resource of distributing other for the user terminal that uses the frequency resource disturbed again by base station 11, thus avoid interference.
Certainly, because the upward signal of certain user terminal in 10 regions within the jurisdiction, base station might cause interference to the upward signal of the user terminal in other sub-districts, base station 10 might receive the adjustment notification message from other base stations.Therefore, sometimes, the frequency resource allocation relevant information from user terminal not only will be considered in base station 10 for its user terminal dividing frequency resource of having jurisdiction over the time, also will consider the adjustment notification message from other base station.
It is pointed out that above and described the method flow that is used to control presence of intercell interference base station 10 and the user terminal 20 that during specific implementation, method flow may be because the difference of the framework of actual operation system, communication protocol and changing slightly from view of function.With the WiMAX wireless communication system is example, and the carrier that base station 10 sends to the frequency resource notification message of user terminal 20 and the notification message that interweaves can all be a uplink map message (UL-MAP), also can be independent control signaling.
Here need to prove, second preassigned and the 3rd preassigned all comprise one or more threshold values, the setting of each threshold value all with the various parameter correlations of actual operation system, for example, the range size of each jurisdiction district, base station, the communication technology that is adopted etc.Second preassigned can be identical with first preassigned, also can be different.
It is pointed out that in addition frequency resource set F1, F2, the F3 shown in Fig. 1 and Fig. 2 can be continuous frequency resource, also can be the frequency resource that disperses.In addition, each base station assigns can be continuous to the frequency resource of user terminal, also can disperse, as long as between each base station identical strategy is taked in the distribution of frequency resource.Do a simple explanation with the example shown in Fig. 5 (a)-5 (b), suppose that F1 is continuous frequency resource set, in Fig. 5 (a), base station 10 is divided into three continuous moieties with the frequency resource among the F1, give three user terminals 20, user terminal 21, user terminal 22 uses.Certainly, the resource allocation of F1 also can be taked the situation as shown in Fig. 5 (b), base station 10 is divided into nine moieties with frequency resource, 1st, 4,7 part f1, f4 and f7 distribute to user terminal 20 uses, 2nd, 5,8 part f2, f5 and f8 distribute to user terminal 21 uses, and the 3rd, 6,9 part f3, f6 and f9 distribute to user terminal 22 and use.Each part shown in Fig. 5 (b) comprises one or more continuous sub-carriers.
Fig. 6 shows the structured flowchart that is used to control the Interference Control device 80 that disturbs between neighbor cell according to a specific embodiment of the present invention in wireless communication network base station, and this Interference Control device 80 comprises resource allocation device 81, dispensing device 82, checkout gear 83 and resource adjusting device 84.Wherein, the function of dispensing device 82 can be carried out by two sub-device-judgment means 821 and controlled dispensing device 822 again.Need to prove, for for simplicity, sub-device in many preferred embodiments is shown among Fig. 6 in the lump, those skilled in the art will be understood that according to the instruction of this specification, wherein only resource allocation device 81 and dispensing device 82 are to realize the necessary device of the present invention, and other sub-device is an option means.
Below in conjunction with Fig. 6 and Fig. 1 the process of disturbing between the Interference Control device 80 control neighbor cells of base station 10 that is arranged in of the present invention is described in detail.
At first, resource allocation device 81 is according to the frequency resource allocation relevant information from user terminal 20 in these 10 jurisdiction districts, base station, for user terminal 20 distributes the correspondent frequency resource.Here the frequency resource allocation relevant information comprises the signal quality of upward signal of user terminal 20 and/or the geographical location information of user terminal 20.The parameter of judging the signal quality of upward signal comprises various parameters and combination in any thereof such as Signal Interference and Noise Ratio, bit error rate, frame error rate, signal power.
For example, resource allocation device 81 bases judge that from the signal quality of the upward signal of user terminal 20 user terminal 20 is near the center of housing estate zone of base station or at the cell edge place away from the base station.If the signal quality of the upward signal of user terminal 20 is better than the 4th preassigned, for example, the Signal Interference and Noise Ratio of the upward signal of user terminal 20 is lower than a predetermined threshold greater than a predetermined threshold and/or bit error rate, then resource allocation device 81 judges that user terminal 20 is in the center of housing estate zone near the base station, and resource allocation device 81 can distribute the frequency resource in the whole frequency resource set (F1+F2+F3) to use for user terminal 20.If the signal quality of the upward signal of user terminal 20 is worse than the 4th preassigned, then resource allocation device 81 judges that user terminal 20 is in the cell edge place away from the base station, and then the frequency resource among the dividing frequency resource collection F1 uses for user terminal 20.Here the 4th preassigned comprises one or more predetermined thresholds, and the value of each predetermined threshold depends on the various settings of actual operation system.The parameter of judging the signal quality of upward signal comprises various parameters and combination in any thereof such as Signal Interference and Noise Ratio, bit error rate, frame error rate, signal power.
If user terminal 20 has a locating module, resource allocation device 81 also can be that user terminal 20 distributes the correspondent frequency resource according to the geographical position at user terminal 20 places.For example in schematic diagram shown in Figure 2, if the design of piecemeal frequency resource makes cell edge place in different directions take different frequency resources, resource allocation device 81 then can be directly be the different frequency resources of user terminal 20 distribution according to the geographical location information of user terminal 20.
Dispensing device 82 transmission frequency resource notification message are given user terminal 20 then, adopt base stations 10 to communicate for the correspondent frequency resource of its distribution and base station 10 with informing user terminal 20.
Dispensing device 82 is also according to first predetermined condition, transmission interweaves notification message to user terminal 20, adopt specific interlacing pattern I1 and base station 10,10 jurisdiction districts, base station to communicate with informing user terminal 20, be about on the frequency resource of base station 10 distribution, send to base station 10 through the upward signal after the interleaving treatment.
Here first predetermined condition comprises two kinds of situations: first kind is to be in all user terminals in certain sub-district all to adopt with the specific interlacing pattern in this sub-district upward signal is carried out interleaving treatment; Second kind is only relatively poor or from the base station of sub-district when far away when the quality of uplink signal of user terminal, and user terminal just adopts with the specific interlacing pattern in this sub-district upward signal is carried out interleaving treatment.
Below in conjunction with Fig. 6 and Fig. 1 above-mentioned second kind of situation is elaborated.At first, judgment means 821 judges whether the signal quality from the upward signal of user terminal 20 that receives is worse than first preassigned; If the signal quality of the upward signal of user terminal 20 is worse than first preassigned, 822 transmissions of controlled dispensing device interweave notification message to described user terminal 20, communicate with interlacing pattern I1 and the base station 10 that informing user terminal 20 adopts and 10 jurisdiction districts, base station are specific.
Preferably, judgment means 821 judges also whether the signal quality from the upward signal of user terminal 20 is worse than second preassigned; If the signal quality of the upward signal of user terminal 20 is worse than second preassigned, 83 of checkout gears detect the signal quality from the interference signal of other user terminal in the adjacent base station region within the jurisdiction that is comprised in the described upward signal from user terminal.Be after checkout gear 83 utilizes the specific interlacing pattern of each neighbor cell that the upward signal that receives is carried out the deinterleaving processing, obtain the signal quality of each interference signal after deinterleaving is handled.
Judgment means 821 judges whether the signal quality of each interference signal meets second predetermined condition; If the signal quality of certain interference signal meets second predetermined condition, 84 of resource adjusting devices are carried out the frequency resource adjustment and are handled, so that the shared frequency resource of user terminal 20 and other user terminal that causes interference is different.Here second predetermined condition comprises one of following two conditions: the first, the signal quality of interference signal is better than the 3rd preassigned; The second, the signal quality of interference signal is better than with the specific interlacing pattern in 10 jurisdiction districts, base station the upward signal that receives being carried out the signal quality that the useful signal of back gained is handled in deinterleaving.
As shown in Figure 1, suppose that the interference of upward signal of 21 pairs of user terminals 20 of user terminal of being had jurisdiction over base station 11 is bigger.Particularly, the frequency resource adjustment is handled and comprised dual mode: a kind of is the frequency resource of distributing other for user terminal 20 by resource adjusting device 84 control resource allocation devices 81, so that to distribute to the upstream frequency resource of user terminal 21 inequality with base station 11, thereby avoid interference.It is as follows that another kind of frequency resource is adjusted mode: resource adjusting device 84 sends adjusts notification message to base station 11, with frequency resource (being the frequency resource of the user terminal 20 current uses) informing base station 11 that will be disturbed, and informing base station 11 is carried out frequency resource adjustment processing, i.e. frequency resource of distributing other for the user terminal that uses this frequency resource of being disturbed again by base station 11, thus avoid interference.
Certainly, because the upward signal of certain user terminal in 10 regions within the jurisdiction, base station might cause interference to the upward signal of the user terminal in other sub-districts, base station 10 might receive the adjustment notification message from other base stations.Therefore, preferably, resource allocation device 81 not only will be considered the frequency resource allocation relevant information from user terminal for its user terminal dividing frequency resource of having jurisdiction over the time, also will consider the adjustment notification message from other base station.
Here need to prove, first preassigned, second preassigned and the 3rd preassigned all comprise one or more threshold values, the setting of each threshold value all with the various parameter correlations of actual operation system, for example, the range size of each jurisdiction district, base station, the communication technology that is adopted etc.Second preassigned can be identical with first preassigned, also can be different.
Fig. 7 shows the structured flowchart that is used for the auxiliary Interference Control device 90 that disturbs between the assist control neighbor cell according to a specific embodiment of the present invention in the user terminal of cordless communication network.Should comprise receiving system 91 and control device 92 by auxiliary Interference Control device 90.
Below with reference to Fig. 1 the process of disturbing between the auxiliary Interference Control device 90 assist control neighbor cells that are arranged in user terminal 20 is elaborated.
At first, the frequency resource notification message that receiving system 91 receives from base station 10, this frequency resource notification message are used for the frequency resource informing user terminal 20 of base station 10 for user terminal 20 distribution.
Then, control device 92 is according to the frequency resource notification message, and control user terminal 20 communicates with base station 10 on the frequency resource of base station 10 distribution.
And receiving system 91 also receives the notification message that interweaves from base station 10, and this notification message that interweaves is used for informing user terminal 20 adopts and 10 jurisdiction districts, base station are specific interlacing pattern I1 and base station 10 and communicates.
Then, control device 92 is according to interweaving notification message, control user terminal 20 adopts and these 10 jurisdiction districts, base station are specific interlacing pattern I1 and base station 10 communicate, and soon the upward signal after the interleaving treatment sends to base station 10 on the frequency resource of base station 10 distribution.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the appended claims.
Claims (20)
1. one kind is used to control the method for disturbing between neighbor cell in wireless communication network base station, may further comprise the steps:
I. according to frequency resource allocation relevant information, for described user terminal distributes the correspondent frequency resource from user terminal in this jurisdiction district, base station;
Ii. transmission frequency resource notification message is given described user terminal, adopts corresponding frequency resource and this base station to communicate to notify described user terminal;
It is characterized in that, further comprising the steps of:
A. according to first predetermined condition, transmission interweaves notification message to described user terminal, adopts the specific interlacing pattern in this jurisdiction district, base station and this base station to communicate to notify described user terminal.
2. method according to claim 1 is characterized in that, described step a is:
-judge whether the signal quality of the upward signal of described user terminal is worse than first preassigned;
If the signal quality of the upward signal of-described user terminal is worse than first preassigned, then send the described notification message that interweaves to described user terminal, communicate to notify interlacing pattern and this base station that described user terminal adopts and this jurisdiction district, base station is specific.
3. method according to claim 1 and 2 is characterized in that, and is further comprising the steps of:
-judge whether the signal quality of the upward signal of described user terminal is worse than second preassigned;
If the signal quality of the upward signal of-described user terminal is worse than second preassigned, then detect the signal quality that is comprised in the described upward signal from the interference signal of other user terminal in the adjacent base station region within the jurisdiction from user terminal;
-judge whether the signal quality of described interference signal meets second predetermined condition;
If the signal quality of-described interference signal meets second predetermined condition, then carry out the frequency resource adjustment and handle, so that the shared frequency resource of described user terminal and described other user terminal is different.
4. method according to claim 3 is characterized in that, described second predetermined condition comprises each in the following:
The signal quality of-described interference signal is better than the 3rd preassigned; Or
The signal quality of-described interference signal is better than the signal quality of described user terminal.
5. according to claim 3 or 4 described methods, it is characterized in that described frequency resource adjustment is handled and be may further comprise the steps:
-the frequency resource of distributing other for described user terminal is so that the shared frequency resource of described user terminal and described other user terminal is different.
6. according to claim 3 or 4 described methods, it is characterized in that described frequency resource adjustment is handled and be may further comprise the steps:
-send to adjust notification message to described adjacent base station, being used to notify it is the frequency resource that described other user terminal distributes other, so that the shared frequency resource of described other user terminal and described user terminal is different.
7. according to each described method in the claim 1 to 6, it is characterized in that described step I also comprises:
-according to from the signal quality of the upward signal of described user terminal with from the adjustment notification message of adjacent base station, the frequency resource of distributing other for described user terminal.
8. according to each described method in the claim 1 to 7, it is characterized in that, described frequency resource allocation relevant information comprise that the base station receives from the signal quality of the upward signal of user terminal and/or the geographical location information of user terminal.
9. method according to claim 8 is characterized in that, described signal quality comprise in the following each or appoint multinomial:
-Signal Interference and Noise Ratio;
-bit error rate;
-frame error rate;
-signal power.
10. one kind is used to control the Interference Control device that disturbs between neighbor cell in wireless communication network base station, comprising:
Resource allocation device is used for according to the frequency resource allocation relevant information from this jurisdiction district, base station user terminal, for described user terminal distributes the correspondent frequency resource;
Dispensing device is used for transmission frequency resource notification message and gives described user terminal, adopts corresponding frequency resource and this base station to communicate to notify described user terminal.
It is characterized in that described dispensing device also is used for:
-Gen first predetermined condition, transmission interweaves notification message to described user terminal, adopts the specific interlacing pattern in this jurisdiction district, base station and this base station to communicate to notify described user terminal.
11. Interference Control device according to claim 10 is characterized in that, described dispensing device also comprises:
Judgment means is used to judge whether the signal quality of described user terminal is worse than first preassigned;
Controlled dispensing device, be worse than first preassigned if be used for the signal quality of described user terminal, then send the described notification message that interweaves to described user terminal, communicate to notify interlacing pattern and this base station that described user terminal adopts and this jurisdiction district, base station is specific.
12., it is characterized in that described judgment means also is used for according to claim 10 or 11 described Interference Control devices:
-judge whether the signal quality of described user terminal is worse than second preassigned;
Wherein, also comprise:
Checkout gear is worse than second preassigned if be used for the signal quality of described user terminal, then detects the signal quality from the interference signal of other user terminal in the adjacent base station region within the jurisdiction that is comprised in the described upward signal from user terminal;
Described judgment means also is used for:
-judge whether the signal quality of described interference signal meets second predetermined condition;
Wherein, also comprise:
The resource adjusting device meets second predetermined condition if be used for the signal quality of described interference signal, then carries out the frequency resource adjustment and handles, so that the shared frequency resource of described user terminal and described other user terminal is different.
13. Interference Control device according to claim 12 is characterized in that, described second predetermined condition comprises each in the following:
The signal quality of-described interference signal is better than the 3rd preassigned; Or
The signal quality of-described interference signal is better than the signal quality of described user terminal.
14., it is characterized in that described resource adjusting device also is used for according to claim 12 or 13 described Interference Control devices:
-to notify described resource allocation device be the frequency resource that described user terminal distributes other, so that the shared frequency resource of described user terminal and described other user terminal is different.
15., it is characterized in that described resource adjusting device also is used for according to claim 12 or 13 described Interference Control devices:
-send to adjust notification message to described adjacent base station, being used to notify it is the frequency resource that described other user terminal distributes other, so that the shared frequency resource of described other user terminal and described user terminal is different.
16., it is characterized in that described resource allocation device also is used for according to each described Interference Control device in the claim 10 to 15:
-according to from the signal quality of the upward signal of described user terminal with from the adjustment notification message of adjacent base station, the frequency resource of distributing other for described user terminal.
17. according to each described Interference Control device in the claim 10 to 16, it is characterized in that, described frequency resource allocation relevant information comprise that the base station receives from the signal quality of the upward signal of user terminal and/or the geographical location information of user terminal.
18. Interference Control device according to claim 17 is characterized in that, described signal quality comprise in the following each or appoint multinomial:
-Signal Interference and Noise Ratio;
-bit error rate;
-frame error rate;
-signal power.
19. one kind is used for the method disturbed between the assist control neighbor cell, may further comprise the steps in the user terminal of cordless communication network:
-receiving frequency resource notification message from affiliated base station, this frequency resource notification message is used for notifying this user terminal with base station under described for the frequency resource that this user terminal distributes;
-according to described frequency resource notification message, on the frequency resource of described affiliated base station assigns, communicate with this base station;
It is characterized in that, further comprising the steps of:
-reception is from the notification message that interweaves of base station under described, and interlacing pattern that this notification message that interweaves is used to notify this user terminal to adopt and described affiliated jurisdiction district, base station is specific and described affiliated base station communicate;
-according to the described notification message that interweaves, specific interlacing pattern and this base station in employing and this described affiliated jurisdiction district, base station communicates.
20. one kind is used for the auxiliary Interference Control device that disturbs between the assist control neighbor cell, comprises in the user terminal of cordless communication network:
Receiving system is used to receive the frequency resource notification message from affiliated base station, and this frequency resource notification message is used for notifying this user terminal with base station under described for the frequency resource that this user terminal distributes;
Control device is used for according to described frequency resource notification message, controls this user terminal and communicates with this base station on the frequency resource of described affiliated base station assigns;
It is characterized in that described receiving system also is used for:
-reception is from the notification message that interweaves of base station under described, and interlacing pattern that this notification message that interweaves is used to notify this user terminal to adopt and described affiliated jurisdiction district, base station is specific and described affiliated base station communicate;
Described control device also is used for:
-according to the described notification message that interweaves, control interlacing pattern and this base station that this user terminal adopts and this described affiliated jurisdiction district, base station is specific and communicate.
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| CN200710170733XA CN101442752B (en) | 2007-11-21 | 2007-11-21 | Method and apparatus for controlling interference between neighboring districts in base station and user terminal |
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| CN200710170733XA CN101442752B (en) | 2007-11-21 | 2007-11-21 | Method and apparatus for controlling interference between neighboring districts in base station and user terminal |
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| CN101925069A (en) * | 2009-06-15 | 2010-12-22 | 株式会社Ntt都科摩 | Interference suppression method and device in wireless cellular network |
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| CA2023053C (en) * | 1990-08-10 | 1994-06-28 | Frank D. Benner | Method for assigning telecommunications channels in a cellular telephone system |
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| CN101043693B (en) * | 2006-03-23 | 2011-05-11 | 华为技术有限公司 | Method and system for inter-cell eliminating interference |
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