CN102204311A - Method and apparatus for handling interference between base stations - Google Patents
Method and apparatus for handling interference between base stations Download PDFInfo
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- CN102204311A CN102204311A CN2011800006712A CN201180000671A CN102204311A CN 102204311 A CN102204311 A CN 102204311A CN 2011800006712 A CN2011800006712 A CN 2011800006712A CN 201180000671 A CN201180000671 A CN 201180000671A CN 102204311 A CN102204311 A CN 102204311A
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Abstract
The invention discloses a method and an apparatus for handling interference between base stations, belonging to the communication field and allowing decreasing the interference between cofrequency base stations. The method comprises: receiving improved uplink frames sent by a user end via the base stations, wherein the front end of the improved uplink frames are free sub-frames with predetermined duration; and demodulating the improved uplink frames. The apparatus for handling interference between base stations comprises a receiver unit for receiving improved uplink frames sent by the user end, wherein the front end of the improved uplink frames are the free sub-frames with predetermined duration, and a demodulation unit for demodulating the improved uplink frames. The invention embodiment is mainly applied to wireless communication system.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and apparatus of handling inter base station interference.
Background technology
In wireless communication system, because frequency spectrum resource is limited, signal cover has overlapping adjacent base station, uses different frequency bands to carry out signal transmitting and receiving, and signal cover does not have overlapping non-adjacent base station then can use identical frequency band.
In Fig. 1, base station A and base station B are the non-adjacent base station of using same frequency segment, at the downlink frame transmit time segments, and base station A transmitting downstream frame A, base station B transmitting downstream frame B simultaneously.Under the normal condition, downlink frame A can not cause interference to base station B through overdamping even enter the signal cover of base station B yet; But, when the decorating position of base station A higher, or when wide low-lying level terrain is arranged between base station A and the base station B, downlink frame A is after the signal cover that enters base station B, may still have stronger signal strength signal intensity, thereby cause after uplink frame receives the period arrival, downlink frame A is received by base station B; In the case, the downlink frame A of base station A can cause interference to the uplink frame that base station B sends to base station B demodulation user side.Downlink frame A among Fig. 1, downlink frame B after 0 time, arrive position as shown in Figure 2 through t when the uplink frame reception period begins.In Fig. 2, the afterbody of downlink frame A is not yet through base station B, thereby the fore-end of the uplink frame C that the user side that causes base station B sends and the afterbody of downlink frame A arrive base station B simultaneously, and downlink frame A and uplink frame C are received by base station B simultaneously, cause the demodulation of uplink frame C is subjected to the interference of downlink frame A.
Summary of the invention
Embodiments of the invention provide a kind of method and apparatus of handling inter base station interference, can reduce with the interference between the base station frequently.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method of handling inter base station interference comprises:
The base station receives the modified model uplink frame of user side emission, and the front end of described modified model uplink frame is the idle subframe of scheduled duration;
Described modified model uplink frame is carried out demodulation.
A kind of device of handling inter base station interference comprises:
Modified model frame receiving element is used to receive the modified model uplink frame that user side is launched, and the front end of described modified model uplink frame is the idle subframe of scheduled duration;
Modified model frame demodulating unit is used for described modified model uplink frame is carried out demodulation.
The method and apparatus of the processing inter base station interference that the embodiment of the invention provides, the modified model uplink frame that idle subframe is arranged by receiving belt, make downlink frame other base station and described modified model uplink frame same frequency through being received by the base station simultaneously with described idle subframe after the propagation delay time, thereby make the base station separate the influence that timing is not subjected to the downlink frame of described same frequency to uplink frame, the downlink frame that has reduced described other base stations causes the possibility of interference to the described modified model uplink frame of described base station demodulation.
Description of drawings
Fig. 1 is the schematic diagram of the base station downlink frame of use same frequency segment;
Fig. 2 is passing through t after 0 time on Fig. 1 basis, the schematic diagram that the while is received by base station B appears in the uplink frame C and the downlink frame A of user side emission;
Fig. 3 is the schematic diagram of inter base station interference in the embodiment of the invention 1;
Fig. 4 is a flow chart of handling the method for inter base station interference in the embodiment of the invention 1;
Fig. 5 is a block diagram of handling the device of inter base station interference in the embodiment of the invention 1;
Fig. 6 is a flow chart of handling the method for inter base station interference in the embodiment of the invention 2;
Fig. 7 is the schematic diagram of WIMAX frame structure;
Fig. 8 is the schematic diagram that uses the WIMAX base station downlink frame of same frequency in the embodiment of the invention 2;
Fig. 9 is on the basis of Fig. 7, and downlink frame A does not cause the schematic diagram of interference to base station B demodulation uplink frame C;
Figure 10 is on the basis of Fig. 7, and downlink frame A causes the schematic diagram of interference to base station B demodulation uplink frame C;
Figure 11 is a flow chart of handling the method for WIMAX inter base station interference in the embodiment of the invention 2;
Figure 12 is the schematic diagram of the modified model uplink frame in the WIMAX system in the embodiment of the invention 2;
Figure 13 in the embodiment of the invention 2 in the WIMAX system by idle subframe is set in uplink frame C, avoid the schematic diagram of downlink frame A to the interference of base station B demodulation uplink frame C;
Figure 14 is a block diagram of handling the device of inter base station interference in the embodiment of the invention 3.
Embodiment
Be clearly and completely described below in conjunction with the accompanying drawing of the embodiment of the invention technical scheme to the embodiment of the invention, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment 1:
The process that the base station sends downlink frame and reception uplink frame is the time-division, as shown in Figure 3.In Fig. 3, base station B carries out the transmission of downlink frame and the reception of uplink frame successively, and when the downlink frame of base station A propagated into base station B, if base station B is receiving uplink frame, then the downlink frame of base station A can cause interference for the process of base station B demodulation uplink frame.Under this scene, the embodiment of the invention provides a kind of method of handling inter base station interference, as shown in Figure 4, may further comprise the steps:
101, the base station receives the modified model uplink frame of user side emission.
The front end of described modified model uplink frame is the idle subframe of scheduled duration.By setting the idle subframe of predetermined length, make downlink frame described idle subframe and other base station and described modified model uplink frame same frequency arrive described base station simultaneously through after the propagation delay time.
102, described modified model uplink frame is carried out demodulation.
The fore-end of described modified model uplink frame is set to idle subframe, the base station is at the timing of separating that carries out the modified model uplink frame, described idle subframe is not carried out the demodulation action, then arrive other base station and the downlink frame described modified model uplink frame same frequency of described base station simultaneously, can not cause interference the demodulation action of described base station with described idle subframe.Certainly, as a kind of feasible application scenarios, the demodulation action can be carried out to described idle subframe in described base station, because not having in the described idle subframe need be by demodulated information, demodulation to described idle subframe can not produce valuable data result, so other base station and the downlink frame described modified model uplink frame same frequency that arrives described base station simultaneously with described idle subframe can not cause interference to the demodulation action of base station.When timing is separated to other parts of the modified model uplink frame of described idle subframe back in described base station, the downlink frame with described modified model uplink frame same frequency of described other base station has been passed through described base station, does not disturb thereby can not produce the demodulation action of described base station.
Simultaneously, the embodiment of the invention also provides a kind of device of handling inter base station interference, as shown in Figure 5, comprising: modified model frame receiving element 51, modified model frame demodulating unit 52.
Modified model frame receiving element 51 is used to receive the modified model uplink frame of user side emission, and the front end of described modified model uplink frame is the idle subframe of scheduled duration.
Modified model frame demodulating unit 52 is used for described modified model uplink frame is carried out demodulation.
The method and apparatus of the processing inter base station interference that the embodiment of the invention provides, the modified model uplink frame that idle subframe is arranged by receiving belt, make downlink frame other base station and described modified model uplink frame same frequency through being received by the base station simultaneously with described idle subframe after the propagation delay time, thereby make the base station separate the influence that timing is not subjected to the downlink frame of described same frequency, the downlink frame that has reduced described other base stations causes the possibility of interference to the described modified model uplink frame of described base station demodulation.
Embodiment 2:
The embodiment of the invention provides a kind of method of handling inter base station interference, as shown in Figure 6, may further comprise the steps:
201, the base station receives the modified model uplink frame of user side emission.
The front end of described modified model uplink frame is the idle subframe of scheduled duration.By setting the idle subframe of predetermined length, make downlink frame described idle subframe and other base station and described modified model uplink frame same frequency arrive described base station simultaneously through after the propagation delay time.Other parts except described idle subframe in the described modified model uplink frame are busy subframe.
Wherein, the scheduled duration of described idle subframe can be according to the distance between described base station and other base stations, and the transmission of downlink frame can not cause the difference between the distance between the predetermined landing of interference to the reception of uplink frame, sets.About the associated description that the time value of described scheduled duration is provided with, can be with reference to the description that idle subframe is set in the embodiment of the invention WINMAX system hereinafter.
202, judge whether the current sub-frame of uplink that receives is busy subframe.
The sub-frame of uplink of the modified model uplink frame that receives is detected in described base station, if described sub-frame of uplink is described idle subframe, the demodulation to described idle subframe is not carried out in described base station; If described sub-frame of uplink is described busy subframe, turn to step 203.
203, when the sub-frame of uplink that receives was described busy subframe, demodulation was carried out to described busy subframe in described base station.
The fore-end of described modified model uplink frame is set to described idle subframe, when described idle subframe arrives described base station, demodulation action is not carried out to described idle subframe in described base station, and then other base station and the downlink frame described modified model uplink frame same frequency that arrives described base station simultaneously with described idle subframe can not cause interference to the demodulation action of described base station.The described idle subframe that described busy subframe lags behind same uplink frame arrives described base station.When described busy subframe arrived described base station, the downlink frame with described modified model uplink frame same frequency of described other base station was passed through described base station fully, can not disturb the demodulation of described base station to described busy subframe.Certainly, as a kind of feasible application scenarios, the demodulation action also can be carried out to described idle subframe in described base station, need be but do not have in the described idle subframe by demodulated information, thereby the demodulation result of whole modified model uplink frame do not impacted.
As a kind of optional practical application scene, the method that the embodiment of the invention provides is being used OFDMA (Orthogonal Frequency Division Multiple Access, the OFDM access) has extensive use in TDD (Time Division Duplex, the time division duplex) wireless communication system of technology.
WIMAX (Worldwide Interoperability for Microwave Access) is based on the wireless MAN broadband access technology of IEEE802.16, use the WIMAX system of OFDMA and TDD technology, its user side to the structure of the uplink frame of base station as shown in Figure 7, wherein the symbol Symbol of first three on time domain (symbol0, symbol1, symbol2) is the public domain by protocol definition.In addition, in the WIMAX system, its downlink frame transmit time segments and uplink frame received between the period one section fixing transmitting-receiving gap.WIMAX system with the 10M bandwidth is an example, and its transmitting-receiving gap is 105.71us (microsecond).Might as well be 300000km/s with electromagnetic transmission speed value, can obtain:
300000*105.7/1000000＝31.7km
For base station A in the WIMAX system and base station B, two base station spacings are S (S≤31.7km), at described downlink frame transmit time segments, base station A and base station B be transmitting downstream frame A and downlink frame B respectively, if two frames transmit on same direction, then the spacing between the frame head of two frames is S, might as well suppose when the downlink frame transmit time segments finishes, downlink frame A and downlink frame B send from the base station fully, as shown in Figure 8.On the basis of Fig. 8, downlink frame A and downlink frame B have transmitted 31.7km again behind 105.71us, and the base station enters uplink frame and receives the period simultaneously, begins to receive the uplink frame C that user side is uploaded, as shown in Figure 9.In Fig. 9, downlink frame A has passed through base station B, at this moment, even downlink frame A still has stronger signal strength signal intensity after the signal cover that enters base station B, and is received by base station B, also can not cause interference to base station B demodulation uplink frame C.But in situation shown in Figure 10, the interval S 1 of described base station A and base station B is greater than 31.7km, so after uplink frame receives the period arrival, the afterbody of downlink frame A is no show base station B still, this moment, base station B received the uplink frame C of described downlink frame A and user side simultaneously, downlink frame A will cause interference to the demodulation of uplink frame C fore-end, be defined as among first three symbol of public domain HARQ (Hybrid Automatic Repeat Request being arranged, mix automatic repeat requests) ACK information, CQICH (Channel Quality Information Channel, the channel quality indicating channel) information etc., the interference that the demodulation of described first three symbol is caused will make the uplink service of base station B greatly worsen.
Be example with the WIMAX system in the TDD wireless communication system of using the OFDMA technology below, the method for the processing inter base station interference of the embodiment of the invention is described.As shown in figure 11, said method comprising the steps of.
301, the WIMAX base station receives the modified model uplink frame of user side emission.
In the WIMAX system, for reducing the interference of downlink frame to uplink frame, can adjust the structure of uplink frame in advance, continuous three symbol of the frame head of uplink frame are vacated, with the frame structure among Fig. 7 is example, vacate symbol0 to symbol2, move on to symbol3 to symbol5 after the information of the public domain of symbol0 to symbol2, the structure of the modified model uplink frame that obtains as shown in figure 12.
3 symbol that the front end of described modified model uplink frame is vacated are defined as idle subframe, and the scheduled duration of described idle subframe is the duration of 3 symbol vacating of described front end.For instance, can described idle subframe be set to Safetyzone by the WIMAX agreement, the demodulation action is not carried out to Safetyzone in the base station.Downlink frame other WIMAX base station and described modified model uplink frame same frequency is through after the propagation delay time, and preceding 3 symbol that receive period and described modified model uplink frame in uplink frame arrive described WIMAX base station simultaneously, and are received by described WIMAX base station.
The front end of described modified model uplink frame is set to the idle subframe that duration is 3 symbol, original information content among 3 symbol of front end (ACK information, CQICH information etc.) moves among the symbol of back accordingly, when the information content of the symbol of the described immigration of described WIMAX base station demodulation back, can not be subjected to interference described other WIMAX base station and downlink frame described modified model uplink frame same frequency.
Other parts except described idle subframe in the described modified model uplink frame are busy subframe.
302, whether the sub-frame of uplink of judging the current modified model uplink frame that receives is busy subframe.
The sub-frame of uplink of the modified model uplink frame that receives is detected in described WIMAX base station, if described sub-frame of uplink is described idle subframe, the demodulation to described idle subframe is not carried out in described WIMAX base station; If described sub-frame of uplink is described busy subframe, turn to step 303.
303, when the sub-frame of uplink that receives was described busy subframe, demodulation was carried out to described busy subframe in described WIMAX base station.
Preceding 3 symbol (symbol0, symbol1, symbol2) of the described modified model uplink frame in the WIMAX system are set under the situation of described idle subframe, when described idle subframe arrived described base station, the demodulation action was not carried out to described idle subframe in described WIMAX base station.In the case, other WIMAX base station and the downlink frame described modified model uplink frame same frequency that arrives described WIMAX base station simultaneously with described idle subframe can not cause interference to the demodulation action of described WIMAX base station.
The described idle subframe that described busy subframe lags behind in the same uplink frame arrives described WIMAX base station.When described busy subframe arrived described WIMAX base station, the downlink frame with described modified model uplink frame same frequency of described other WIMAX base station was passed through described WIMAX base station fully, can not disturb the demodulation of described base station to described busy subframe.Described WIMAX base station begins to carry out demodulation to the modified model uplink frame from symbol3.
Still the situation with Figure 10 is an example, when uplink frame C arrives base station B, the afterbody of downlink frame A is not yet by base station B, if uplink frame C is described modified model uplink frame, then preceding 3 symbol of uplink frame C are described idle subframe, according to WIMAX agreement regulation, a symbol duration is 102.86us in the WIMAX system of 10M bandwidth, and then preceding 3 symbol durations are 308.58us.Be that the idle subframe that symbol0 to symbol2 forms needs 308.58us by described base station B, in 308.58us, the downlink frame A of described base station A is already by described base station B, can not cause interference to the demodulation of uplink frame C to base station B, as shown in figure 13.
Certainly, as a kind of feasible application scenarios, the demodulation action also can be carried out to described idle subframe in described WIMAX base station, need be but do not have in the described idle subframe by demodulated information, thereby the demodulation result of whole modified model uplink frame do not impacted.
Under the situation of interval S 1 of described base station A and base station B greater than 31.7km, when the scheduled duration of described idle subframe is not less than (S1-31.7)/300000, after the downlink frame with described modified model uplink frame same frequency of other WIMAX base station arrives described WIMAX base station, can not cause interference to described WIMAX base station demodulation downlink frame.Because the WIMAX agreement stipulates that described WIMAX base station is that unit handles uplink frame with three symbol, therefore the duration of described idle subframe is at least 3 symbol; Further, the duration of described idle subframe also can be set to 6 symbol (symbol0 to symbol5) or 9 symbol (symbol0 to symbol8) etc., and original information content moves into the symbol of back accordingly in the described idle subframe.When the information content of the symbol of the described immigration of described base station B demodulation back, can not be subjected to the base station A interference with downlink frame described modified model uplink frame same frequency emission.
Method in the embodiment of the invention also can be used in other use the wireless communication system of OFDMA, such as, the LTE network that communicates in the TDD mode.
The method of the processing inter base station interference that the embodiment of the invention provides has the modified model uplink frame of idle subframe by receiving belt, and the downlink frame that has reduced other base stations causes the possibility of interference to the described modified model uplink frame of described base station demodulation.Especially, in the WIMAX system that uses OFDMA technology, TDD technology, the WIMAX base station also receives other WIMAX base station and downlink frame described modified model uplink frame same frequency when receiving the idle subframe of described modified model uplink frame, not having in the described idle subframe need be by the content of demodulation, thereby has avoided the interference of the downlink frame of other WIMAX base stations to demodulation.
Embodiment 3:
The embodiment of the invention provides a kind of device of handling inter base station interference, as shown in figure 14, comprising: modified model frame receiving element 141, modified model frame demodulating unit 142, described modified model frame demodulating unit 142 also comprises modified model frame demodulation subelement 1421.
Wherein, modified model frame receiving element 141 is used to receive the modified model uplink frame of user side emission, and the front end of described modified model uplink frame is the idle subframe of scheduled duration.
Modified model frame demodulating unit 142 is used for described modified model uplink frame is carried out demodulation.
Modified model frame demodulation subelement 1421 is used for when the sub-frame of uplink of described modified model uplink frame is busy subframe described busy subframe being carried out demodulation.
The fore-end of described modified model uplink frame is set to idle subframe, the base station is at the timing of separating that carries out the modified model uplink frame, described idle subframe is not carried out demodulation action, then other base station and the downlink frame described modified model uplink frame same frequency that arrives described base station simultaneously with described idle subframe can not cause interference to the demodulation action of described base station.Certainly, as a kind of feasible application scenarios, the demodulation action can be carried out to described idle subframe in described base station, because not having in the described idle subframe need be by demodulated information, demodulation to described idle subframe can not produce valuable data result, so other base station and the downlink frame described modified model uplink frame same frequency that arrives described base station simultaneously with described idle subframe can not cause interference to the demodulation action of base station.
As a kind of optional practical application scene, the device that the embodiment of the invention provides has extensive use in the TDD wireless communication system (as the WIMAX system) that uses the OFDMA technology.Description for handle inter base station interference in the WIMAX system can repeat no more with reference to the description in the embodiment of the invention 2 herein.
The device of the processing inter base station interference that the embodiment of the invention provides, the modified model uplink frame that idle subframe is arranged by receiving belt, make downlink frame other base station and described modified model uplink frame same frequency through overlapping on time domain after the propagation delay time with described idle subframe, thereby make the base station separate the influence that timing is not subjected to the downlink frame of described same frequency, the downlink frame that has reduced described other base stations causes the possibility of interference to the described modified model uplink frame of described base station demodulation.
The those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware through the above description of the embodiments, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk as computer, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (8)
1. a method of handling inter base station interference is characterized in that, comprising:
The base station receives the modified model uplink frame of user side emission, and the front end of described modified model uplink frame is the idle subframe of scheduled duration;
Described modified model uplink frame is carried out demodulation.
2. method according to claim 1 is characterized in that, describedly described modified model uplink frame is carried out demodulation also comprises:
When the sub-frame of uplink in the described modified model uplink frame was busy subframe, demodulation was carried out to described busy subframe in described base station.
3. method according to claim 1 and 2 is characterized in that, according to the distance between described base station and other base stations, and the transmission of downlink frame can not cause the difference between the distance between the predetermined landing of interference to the reception of uplink frame, determines described scheduled duration; Wherein, described base station and described other base stations use same frequency to send described downlink frame and described uplink frame and downlink frame to be the same frequency frame.
4. method according to claim 1 and 2 is characterized in that, in the WIMAX of TDD time division duplex Radio Network System, described scheduled duration is three adjacent in WIMAX frame SYMBOL symbols, or six SYMBOL symbols.
5. a device of handling inter base station interference is characterized in that, comprising:
Modified model frame receiving element is used to receive the modified model uplink frame that user side is launched, and the front end of described modified model uplink frame is the idle subframe of scheduled duration;
Modified model frame demodulating unit is used for described modified model uplink frame is carried out demodulation.
6. device according to claim 5 is characterized in that, described modified model frame demodulating unit comprises:
Modified model frame demodulation subelement is used for when the sub-frame of uplink of described modified model uplink frame is busy subframe described busy subframe being carried out demodulation.
7. according to claim 5 or 6 described devices, it is characterized in that according to the distance between described base station and other base stations, and the transmission of downlink frame can not cause the difference between the distance between the predetermined landing of interference to the reception of uplink frame, determines described scheduled duration; Wherein, described base station and described other base stations use same frequency to send described downlink frame and described uplink frame and downlink frame to be the same frequency frame.
8. according to claim 5 or 6 described devices, it is characterized in that in the WIMAX of TDD time division duplex Radio Network System, described scheduled duration is three adjacent in WIMAX frame SYMBOL symbols, or six SYMBOL symbols.
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| PCT/CN2011/074589 WO2011144073A2 (en) | 2011-05-24 | 2011-05-24 | Method and device for processing interference between base stations |
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| WO2011144073A3 (en) | 2012-04-26 |
| WO2011144073A2 (en) | 2011-11-24 |
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Application publication date: 20110928 |