CN104869648A - Physical downlink control channel interference elimination method based on collaboration between base stations - Google Patents
Physical downlink control channel interference elimination method based on collaboration between base stations Download PDFInfo
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- CN104869648A CN104869648A CN201510303995.3A CN201510303995A CN104869648A CN 104869648 A CN104869648 A CN 104869648A CN 201510303995 A CN201510303995 A CN 201510303995A CN 104869648 A CN104869648 A CN 104869648A
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- downlink control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
The invention discloses a physical downlink control channel interference elimination method based on collaboration between base stations and is applied to a wireless cellular mobile communication system. The method comprises the steps as follows: judging serious situation of current interference by estimating signal-to noise ratio (SINR) of a physical downlink control channel (PDCCH) with user equipment in a cellular cell, selecting a traditional interference elimination method or an interference elimination algorithm based on collaboration between the base stations according to condition. In terms of the control channel interference elimination algorithm based on collaboration between the base stations, the base stations or the user equipment is used for determining an interference base station, and control information and channel state of the physical downlink control channel are interacted between the base station and the interference base station via an X2 interface or an S2 interface, and are transmitted to the user equipment with base station equipment via specific time-frequency. The base station equipment can be used for carrying out more precise interference elimination to ensure normal scheduling under the condition that the interference is server to improve system performance.
Description
Technical field
The present invention relates to wireless communication technology field, especially, to the present invention relates in a kind of LTE of being applicable to wireless communication system in identical networking situation based on the control channel interference removing method cooperated between macro base station.
Background technology
Along with the development of industry and the progress of technology, various types of wireless communication systems is all devoted to elevator system performance, to meet ever-increasing performance requirement.Nowadays the wireless communication system extensively promoted the use of is long evolving system, i.e. LTE (LongTerm Evolution) system.
The Anti-Jamming Technique adopted due to each channel of LTE system and system design margin are not quite similar, and therefore the identical networking ability of different channels is also different.In addition, different channels receives the consequence of co-channel interference is also different.In LTE system, Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) for transmitting the scheduling control information (DCI of up-downgoing, Downlink Control Information), determine physical uplink data channel (PDUSH, PhysicalDownlink Shared Channel) and the control information such as Resourse Distribute, frequency modulation type and transmission mode of physical down data channel (PDSCH, Physical Downlink SharedChannel).Different according to its action scope, Physical Downlink Control Channel beared information distinguishes common control information (public search space search) and dedicated control information (special search space).
When Physical Downlink Control Channel is subject to co-channel interference, as cause receive mistake or time delay excessive time, because control channel does not have retransmission mechanism in the process of command transmitting, will cause the communication of whole uplink and downlink and have a strong impact on.LTE system adopts OFDM (OFDMA, Orthogonal Frequency Division Multiple Access) allocation of communication channels, can be the important dedicated channel allocation such as synchronizing signal, broadcast channel, reference symbol special time and frequency resource (these channels are always in specific symbol and subcarrier transmission), the synchronizing signal of Shi Zhe community, broadcast channel, reference symbol are only subject to the interference of the similar channel in other communities respectively, and can not be subject to the interference of other types channel.
Prior art has made a lot of trial for the problem of inter-cell signal interference, but, still there is following problem:
On the one hand, the frequency spectrum of existing signal disturbing processing method many employings interference coordination technique to each region, community is allocated, cause spectrum efficiency can not reach the highest, and interference coordination technique is subject to many limitations in actual deployment, the bottleneck of LTE system when further evolution may be become; On the other hand, the research eliminated for the interference on control channel is less, the scheme that existing interference is eliminated needs to obtain relevant configuration information by serving BS from interference base station, and carry out interference process by configuration information, overall plan complexity is higher, for system adds unnecessary burden, cause obtaining and disturb eradicating efficacy preferably.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art, a kind of light little convenient and the level height difference measurement bay of the certainty of measurement that precision is higher and measurement mechanism are provided, are more applicable to the need of work of actual building structure inspection.
The technical solution adopted for the present invention to solve the technical problems is:
The object of the present invention is to provide the interference elimination method of macro base station minizone Physical Downlink Control Channel (PDCCH) in identical networking situation in a kind of LTE wireless communication system.
The present invention includes following steps:
1) subscriber equipment (UE, User Equipment) signal to noise ratio (SINR to Physical Downlink Control Channel (PDCCH), Signal to Interference plus Noise Ratio) estimate, compare with signal to noise ratio (SINR) threshold value of initial setting, judge serious interference degree.Be greater than this signal to noise ratio (SINR) threshold value, adopt conventional interference cancellation algorithm; Be less than this signal to noise ratio (SINR) threshold value, illustrate that now presence of intercell interference situation is comparatively serious, adopts and carries out interference elimination based on the mode cooperated between base station.
In step 1) in, can described signal to noise ratio (SINR) threshold value proper solution can be adjusted to criterion with Physical Downlink Control Channel (PDCCH), and the specific requirement according to MPS process sets.
In step 1) in, described conventional interference cancellation algorithm, can be AF panel folding (IRC, InterferenceRejection Combining) or be successive interference cancellation techniques, described AF panel folding is the technology being used for carrying out inter-cell interference cancellation in LTE system, belongs to the one of space diversity combining technique technology; Described serial interference elimination is a kind of nonlinear detection techniques based on feedback, disturbs reconstruct more accurately mainly through successively detecting.
In step 1) in, described routine interference is eliminated and is carried out disturbing the switching eliminated can be controlled by subscriber equipment (UE) based on the mode cooperated between base station, and notify that corresponding base station switches by subscriber equipment (UE), complete the step such as information interaction, transmission; Also can be controlled by base station equipment, and notify that corresponding subscriber equipment switches by base station equipment, complete the interference removal process of Received signal strength.
2) serving BS determination interference base station.Serving BS determines adjacent base station subscriber equipment being caused to main interference, carries out alternately with this adjacent base station so that follow-up.Serving BS, according to positioning service, determines the position of subscriber equipment, and determines interfered cell according to this position and the topological structure of wireless network disposed; Or according to neighbor cell of its detection of user equipment to report or the relevant interference information of part neighbor cell, determine interfered cell.
In step 2) in, described positioning service is positioned at user equipment side, is divided into the location based on GPS, and based on the location of mobile operation network base station.
3) interactive information between serving BS and interference base station.By S1 interface or X2 interface.Consider the time delay of X2 interface data interaction, base station interactive information can be carried out by the interface of network layer or data link layer physical connection alternately after MAC layer process.
In step 3) in, S1 interface is the communication interface between base station and packet-based core networks (EPC) defined in G mobile communication regulatory agencies 3GPP, and X2 interface is the logic interfacing between a kind of base station and base station defined in G mobile communication regulatory agencies 3GPP.
In step 3) in, described interactive information is that interference base station sends Physical Downlink Control Channel (PDCCH) information of subscriber equipment and corresponding channel status.
4) serving BS sends interactive information to subscriber equipment (UE).In order to make subscriber equipment (UE) can correctly receive this interactive information, send by specific time-frequency.At least demand fulfillment interference is less or antijamming capability is stronger for this specific time-frequency.
In step 4) in, the transmission that base station sends information by specific time-frequency controls to be positioned at base station side control module, this control module major function is: dispatch available time-frequency, ensures interactive information by the interference of the specific time-frequency of adjacent cell and Traffic Channel, control channel information.
5) subscriber equipment (UE) carries out interference elimination according to interactive information.Receiving terminal processes information after receiving the relevant information of interference base station, comprises the reconstruct of interfere information, and the contrast etc. of result is eliminated in interference.
In step 4) in, the relevant information of the interference base station that subscriber equipment is sent according to base station, reconstructs interference signal as far as possible accurately:
Wherein, y
irepresent the interference signal of i-th interference base station reconstructed, N represents the number of interference base station, H
irepresent the channel matrix of the Physical Downlink Control Channel (PDCCH) of i-th interference base station in interactive information, x
irepresent the scheduling control information (DCI) on the Physical Downlink Control Channel (PDCCH) of i-th interference base station in interactive information.
The invention has the beneficial effects as follows: can neatly by estimating the signal to noise ratio (SINR) of Physical Downlink Control Channel (PDCCH), and judge the serious conditions of current interference according to the specific requirement of system to MPS process, control information, thus take complexity lower and the traditional interference cancellation algorithm very easily realized or complexity high but eliminate of good performance based on base station collaboration carry out disturb eliminate scheme.What the present invention proposed carries out disturbing the scheme eliminated based on base station collaboration, mutual between base station is direct information required for reconstruct interference, avoid the error that information causes in subsequent treatment and recovery process, interfere information can be reconstructed more accurately, thus reach and better disturb eradicating efficacy.
Below in conjunction with drawings and Examples, the present invention is described in further detail; But a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations of the present invention is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is logic diagram of the present invention.
Embodiment
Embodiment
In order to enable object of the present invention, scheme and advantage clearly, following examples will the present invention is described in detail by reference to the accompanying drawings.
A kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations of the present invention, as shown in Figure 1:
Step 101, estimates the signal to noise ratio (SINR) of Physical Downlink Control Channel (PDCCH) according to receiving terminal, and signal to noise ratio (SINR) computational methods of Physical Downlink Control Channel (PDCCH) can reference:
Wherein, SINR
pDCCHfor the signal to noise ratio of Physical Downlink Control Channel, SINR
cQIthe physical down data channel demodulation obtained for link level interface estimates gained signal to noise ratio, EPRE
pDCCHfor the average energy intensity of the minimum running time-frequency resource unit on Physical Downlink Control Channel, EPRE
pDSCHfor the average energy intensity of the minimum running time-frequency resource unit on physical down data channel.
Step 102, by estimating that gained signal to noise ratio (SINR) compares with the threshold value set in advance, judges serious interference degree.Signal to noise ratio (SINR) is greater than this threshold value, adopts conventional interference cancellation algorithm, as AF panel merge algorithm (IRC) or serial interference elimination algorithm; Signal to noise ratio (SINR) is less than this threshold value, illustrates that now disturbed condition is serious, then adopt the mode based on the information interaction of base station to carry out interference and eliminate.Switching about the estimation & disposing mode of signal to noise ratio (SINR) is controlled by subscriber equipment (UE) or serving BS.
Can the degree of interference proper solution can be adjusted to criterion with Physical Downlink Control Channel (PDCCH), and the threshold value of signal to noise ratio (SINR) sets according to the specific requirement of MPS process.When cell signal coverage requirement is 95%, control channel signal to noise ratio (SINR) needs to be greater than-5dB; When cell signal coverage requirement is 98%, control channel signal to noise ratio (SINR) needs to be greater than 6.7dB.Therefore, under the coverage requirement of community 95%, signal to noise ratio (SINR) threshold value can be set to-5dB, when signal to noise ratio (SINR) estimated value of Physical Downlink Control Channel (PDCCH) is greater than-5dB, adopts sequence serial interference elimination algorithm or Sphere Decoding Algorithm to carry out interference and eliminate.When signal to noise ratio (SINR) estimated value of Physical Downlink Control Channel (PDCCH) is less than-5dB, illustrates that now disturbed condition is relatively more serious, adopt the mode based on the information interaction of base station to carry out interference and eliminate.
Step 201, determines interference base station.Serving BS needs the position according to user place, determines potential interfered cell, thus carries out information interaction with the base station of this potential interference community.Base station determines that the method for interfered cell has two kinds:
(1) base station can utilize GPS positioning service, determines the position of subscriber equipment, thus interfered cell determined by the topological structure of the wireless network disposed according to this location point;
(2) subscriber equipment detects the interference-related information of each neighbor cell or part neighbor cell, and report to corresponding base station, interfered cell is determined according to this interference-related information in base station.
Step 301, interactive information between serving BS and interference base station.Mutual information is mainly control information and the channel status of the Physical Downlink Control Channel (PDCCH) that interference base station sends.Because base station side can not directly be measured downlink channel condition or estimate, Physical Downlink Control Channel state can obtain by the following method: for TDD duplex system, on can thinking in channel coherency time, lower channel has reciprocity, interference base station can utilize its information received to carry out channel estimating, and estimates the channel condition information of down channel according to its reciprocity.For FDD duplex system, downlink channel condition obtains by the information feed back of subscriber equipment (UE).The feedback system of subscriber equipment (UE) can adopt display feedback, the state information of direct feedback channel; Also can adopt implicit feedback, after the suitable process of subscriber equipment (UE), feed back to eNB channel status instruction (CQI, channel quality indicator).
Target BS and interference base station are by S1 interface or X2 interface interactive information.Consider that (the typical time delay range of X2 interface is between 10 to 20 milliseconds by the data interaction time delay that produces during X2 interface interactive information in base station, comprise eNB inter-process time delay, node switches and routing delays, propagation delay time between node), undertaken alternately by the interface reporting network layer or data link layer physical connection after MAC layer process interactive information.
Step 302, serving BS sends interactive information by specific time-frequency to subscriber equipment (UE).In order to make subscriber equipment (UE) correctly can receive interactive information from base station when serious interference, need to adopt specific time-frequency to send, this specific time-frequency at least demand fulfillment interference is less or antijamming capability is stronger.Descending approximate blank subframe (ABS, Almost BlankSubframe) can be used as one of transmission channel.
Described approximate blank subframe (ABS) is heterogeneous network to alleviate the interference problem that the user that is positioned at scope extension field is subject to, part subframe is configured to " approximate blank subframe ", user in macro base station severe jamming extension field is subject to for some, by in the upper scheduling of these approximate blank subframe (ABS), the interference that these user's control channels are subject to can be reduced.In R10, X2 signaling can indicate the approximate blank subframe of which sub-frame configuration in the form of a bitmap, in R11, adjacent two macrocells can adopt different approximate blank subframe (ABS) configurations, thus can avoid the interference of approximate blank subframe (ABS).Therefore, can consider that the subscriber equipment (UE) allowing macro base station utilize vacant approximate blank subframe to be interfered to the control channel that it is served sends mutual information.Specific implementation method is:
Pairing approximation blank subframe (ABS) carries out semi-static configuration, and namely the bitmap of macro base station/low power nodes remains unchanged within a period of time, can change after a period of time.Allocation plan is: mark (N/M, K, pattern_type) in, N/M is blank rate, M is total number of sub frames, N is approximate blank subframe (ABS) number in total subframe, and K is continuous subframes number in N number of approximate blank subframe (ABS), and Configuration Type can be ABS or MBSFN, for representing whether data field has Physical Downlink Control Channel (PDCCH) to transmit, and subframe is from No. 0.When base station needs to carry out the transmission of interactive information by approximate blank subframe (ABS), be ABS by the type mark in corresponding subframe, control module in base station is used for carrying out transmission and controls and coordinate, and ensures that the subframe of neighbor cell configuration ABS can not produce conflict and collision.
Step 401, subscriber equipment (UE) carries out interference to be eliminated.Downlink received signal contains desired signal, noise signal and interference signal, can be expressed as:
Wherein, H
0x
drepresent desired signal,
represent the interference signal of reconstruct, n represents noise, and N represents the number of interfered cell.
Can find out according to above-mentioned formula, if mutual by information between base station, obtain transmission information x and the channel status H of interference base station, receiving terminal can complete interference and eliminate, and performance should be better.
Receiving terminal processes information after receiving the relevant information of interference base station, comprises the loss of interfere information, and the contrast etc. of result is eliminated in interference.Subscriber equipment (UE) carries out control channel interference to be eliminated this technology and knows in the art, and the present invention does not repeat them here.
Can find out, compared to the interference cancellation techniques of routine, this programme solves the elimination of different order of severity interference, be particularly useful for solving in isomerous environment, the interference problem brought due to the imbalance of power between base station and the existence of some closed signed user groups (CSG, ClosedSubscriber Group) community.
Step 501, when signal to noise ratio (SINR) is greater than predetermined threshold value, carry out interference by conventional interference cancellation algorithm to eliminate, can be AF panel folding (IRC, Interference Rejection Combining) or be successive interference cancellation techniques, described AF panel folding is the technology being used for carrying out inter-cell interference cancellation in LTE system, belongs to the one of space diversity combining technique technology; Described serial interference elimination is a kind of nonlinear detection techniques based on feedback, disturbs reconstruct more accurately mainly through successively detecting.
Above-described embodiment is only used for further illustrating a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations of the present invention; but the present invention is not limited to embodiment; every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all fall in the protection range of technical solution of the present invention.
Claims (9)
1., based on a Physical Downlink Control Channel interference elimination method for cooperation between base stations, it is characterized in that, comprise the following steps:
(1) serving BS or the signal to noise ratio of subscriber equipment to the Physical Downlink Control Channel between Current Serving BTS and subscriber equipment calculate, and the signal to noise ratio of acquisition and the threshold value preset are compared, if signal to noise ratio is less than predetermined threshold value, perform step (2) to step (4), if signal to noise ratio is greater than predetermined threshold value, then perform step (5);
(2) serving BS is by the positional information of positioning service determination subscriber equipment, and passes through the positional information determination interference base station of subscriber equipment;
(3) serving BS and interference base station carry out information interaction, receive the control information of the Physical Downlink Control Channel of interference base station and corresponding Physical Downlink Control Channel state, and received interactive information is sent to subscriber equipment;
(4) interference of Physical Downlink Control Channel eliminated by subscriber equipment according to received interactive information;
(5) serving BS uses conventional interference elimination method to eliminate the interference of Physical Downlink Control Channel.
2. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 1, is characterized in that: in described step (2), described positioning service is positioned at user equipment side; Subscriber equipment obtains the method for positional information and comprises based on the location of GPS with or based on the location of mobile operation network base station.
3. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 1, it is characterized in that: in described step (3), serving BS and interference base station send or the interface that accepts interactive information is S1 interface or X2 interface.
4. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 1, it is characterized in that: in described step (4), described first base station sends interactive information by specific time-frequency to subscriber equipment.
5. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 4, is characterized in that: described specific time-frequency is reserved approximate blank subframe.
6. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 1, it is characterized in that: in described step (5), the interference elimination method of described routine is eliminate interference by AF panel folding or successive interference cancellation techniques.
7. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 1, is characterized in that: the snr computation mode of described Physical Downlink Control Channel is:
Wherein, SINR
pDCCHfor the signal to noise ratio of Physical Downlink Control Channel, SINR
cQIthe physical down data channel demodulation obtained for link level interface estimates gained signal to noise ratio, EPRE
pDCCHfor the average energy intensity of the minimum running time-frequency resource unit on Physical Downlink Control Channel, EPRE
pDSCHfor the average energy intensity of the minimum running time-frequency resource unit on physical down data channel.
8. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to any one of claim 1 to 7, is characterized in that: described interference base station is one or more.
9. a kind of Physical Downlink Control Channel interference elimination method based on cooperation between base stations according to claim 8, it is characterized in that: in described step (4), the mode that user eliminates Physical Downlink Control Channel interference is eliminated after reconstructing interference signal; The computing formula of subscriber equipment reconstruct interference signal is:
Wherein, y
irepresent the interference signal of i-th interference base station reconstructed, N represents the number of interference base station, H
irepresent the channel matrix of the Physical Downlink Control Channel of i-th interference base station in interactive information, x
irepresent the scheduling control information on the Physical Downlink Control Channel of i-th interference base station in interactive information.
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| CN106941389A (en) * | 2016-01-05 | 2017-07-11 | 中国移动通信集团公司 | A kind of interference elimination method and device |
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| CN113727356A (en) * | 2021-08-26 | 2021-11-30 | 中国联合网络通信集团有限公司 | Method and device for reducing communication interference |
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