CN102611525A - Subframe interleaving interference measurement method in TDD (Time Division Duplex) communication system - Google Patents
Subframe interleaving interference measurement method in TDD (Time Division Duplex) communication system Download PDFInfo
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Abstract
The invention relates to a subframe interleaving interference real-time measurement method in a TDD (Time Division Duplex) communication system. According to the subframe interleaving interference real-time measurement method, a measurement map is configured for user equipment (UE) or a base station needing carrying out interference measurement, and co-frequency subframe interleaving interference measurement is carried out by using a normal wireless communication transmission gap formed by the measurement map. Under the condition of no change of configuration of traditional TDD uplink and downlink subframe proportion, a subframe interleaving interference for a measurement purpose is generated, therefore, when a service cell is configured to be different from adjacent cells in TDD uplink and downlink subframe proportion, a subframe interleaving interference strength is measured in advance. Under the condition of no need of involvement of an engineer, the subframe interleaving interference is measured autonomously in real time; and by matching with the conventional scheduling policy of the base station, the interference measurement is carried out by using the normal wireless communication transmission gap formed by the measurement map without influencing normal wireless communication of the UE and the base station.
Description
Technical field
The present invention has proposed the method for a kind of real-time measurement TDD " subframe is staggered to be disturbed " of the TDD of being applicable to wireless communication system towards moving communicating field.
Technical background
The new generation of wireless development communication technologies is swift and violent in recent years, compares third generation wireless communication technology, and the next-generation mobile communications technology has that the network architecture is simple, signal time delay is little, the high communication quality, fireballing plurality of advantages.Classify from up-downgoing service integration mode, communication system can be divided into TDD (time division multiplexing) and two kinds of patterns of FDD (frequency division multiplexing).There are advantage separately in TDD and FDD system.Compare the FDD system, the TDD system is higher to the utilization ratio of system resource, and can between the base station, use the wireless frame structure of different ascending-descending subframes ratios according to the difference of up-downgoing traffic carrying capacity.The TDD system that determined this technical characterstic can dispose the wireless frame structure that macro base station uses dynamically, neatly, thereby itself and real business demand are complementary.
In addition, along with the fast development of Modern wireless communication technology, very big variation has taken place in wireless network loaded service structure.The wireless communication system in 2G epoch is main with speech business mainly, and the ratio between the up-downgoing business is relatively stable, adopts the ascending-descending subframes ratio of fixing (or semi-static) can adapt to the present situation of business demand.But along with the fast development of data services such as web page browsing, video request program, remote monitoring, the business structure of the wireless communication system diversity more that becomes, unbalanced characteristics on the ratio presentative time of up-downgoing traffic carrying capacity, on the region.New variation has like this promoted the demand of operator to TDD ascending-descending subframes ratio flexible configuration.
From the commercial experience of existing TDD system, can find; If the wireless frame structure of different ascending-descending subframes ratios is used in two TDD sub-districts adjacent one another are; " subframe is staggered to be disturbed " of " system carry out downlink transfer in another system carrying out uplink " will take place in the period in part, as shown in Figure 1.For example, in base station side, the base station of downlink transmission system is when sending, and the base station of uplink system is just in accepting state, and the base station of carrying out uplink will receive the serious interference that comes from the downlink transfer base station.Simultaneously, in end side, carry out the terminal of uplink and also can disturb near the terminal in the downlink transfer state that is in.
Fast development along with business structure; Realize TDD system its wireless frame structure of performance can be dynamically, flexible configuration; And the characteristics that ascending-descending subframes proportion structure and practical business demand are complementary, become urgent problem in the next-generation communication network technology.
Realize this point, require " subframe is staggered to be disturbed " situation under the current environment is assessed, judge whether to launch flexible configuration subframe proportion structure with this.
In at present commercial TDD system, does not still have reliably, means are measured " the staggered interference of subframe " in real time easily.Common practices is when beginning, through engineering staff's field survey, reduces the probability that " subframe is staggered to be disturbed " takes place as far as possible, perhaps carries out the network optimization through the mode of drive test.Yet; Interference environment in the reality network design scene maybe be comparatively complicated; Factors such as time that " subframe staggered disturb " takes place, the power variation of interference all have confidential relation with factors such as time, geographical environment, user distributions, are not that static state is constant.For example, the placement location of family's femto cell can be determined by the user, is not to immobilize.Therefore, only rely on the definite measured result of engineering staff when beginning or drive test, can not reflect the real time status of " subframe is staggered to be disturbed " effectively.Therefore, need a kind of new method of measurement, can monitor in real time " subframe is staggered to be disturbed ", thereby make flexible configuration TDD ascending-descending subframes become possibility.
Summary of the invention
The present invention proposes the method for a kind of real-time measurement TDD " subframe is staggered to be disturbed ".This method will be carried out subscriber equipment (hereinafter to be referred as UE) or " measurement collection of illustrative plates " (Measurement Pattern) of base station configuration of interferometry for needs, and " transmission gap " that the normal wireless of utilizing " measurement collection of illustrative plates " to form is communicated by letter carries out " subframe is staggered to be disturbed " measurement with frequently.This scheme is measured the reference data that gained " subframe is staggered to be disturbed " can be used as base station flexible configuration TDD ascending-descending subframes ratio, the network optimization etc.
This scheme has following characteristics:
-this scheme can be under the situation that does not change existing TDD ascending-descending subframes proportional arrangement; Generation is used to measure " subframe is staggered to be disturbed " of purpose; Thereby realize when Serving cell is configured to the TDD ascending-descending subframes proportional arrangement different with adjacent sub-district " if, the intensity of ' subframe is staggered to be disturbed ' that will produce " carried out measurement in advance;
-this scheme can need not under the situation that the engineering staff participates in, independently, in real time " subframe is staggered to be disturbed " is measured;
-this scheme cooperates the conventional scheduling strategy of base station, and " transmission gap " that the regular traffic that utilizes " measurement collection of illustrative plates " to form transmits carries out interferometry, does not influence the regular traffic transmission of UE and base station.
Key problem in technology point of the present invention and protection point
The present invention through to the base station with (or) UE distributes certain " measurement collection of illustrative plates " (Measurement Pattern) to support the measurement of " subframe is staggered to be disturbed "." measurement collection of illustrative plates " stipulated the resource pattern (Resource Pattern) of one period fixed time and/or assigned frequency; Its time domain unit is an OFDM symbol; Frequency domain unit is minimum frequency domain dispatching unit (for example, being 12 continuous sub-carriers in the LTE system);
2. in " measurement collection of illustrative plates ", execute to disturb the base station or execute and disturb UE and be in emission state, survey and disturb base station or survey and disturb UE and be in the measurement state:
A) execute to disturb the base station or execute and disturb transmitting of UE and can be used as promptly that " subframe of simulation staggered disturb " is tested disturbs base station or survey and disturb UE and receive and measure;
B) survey and to disturb base station or survey and disturb UE through in " measurement collection of illustrative plates ", disturbing transmitting of UE and measure to executing to disturb the base station or execute; Thereby under the situation that does not have " subframe is staggered to be disturbed ", its intensity is measured and assessed to contingent " subframe is staggered to be disturbed " intensity;
Between the base station through backhaul transport (hereinafter to be referred as backhaul) passage (comprising interfaces such as X2, S1), be that base station or UE coordinate the configuration of " measurement collection of illustrative plates ", comprise the time-frequency granularity, cycle of " measurement collection of illustrative plates " etc., or carry out above-mentioned configuration through network management system;
4. the base station is used to report survey and disturbs " subframe is staggered to be disturbed " measurement result that UE obtains in the time-frequency position of " measurement collection of illustrative plates " regulation for surveying " subframe the is staggered to be disturbed " measurement and report of disturbing UE configuration cycle property or Event triggered.This uplink of adjacent area UE of indication measurement is as a result disturbed the common subframe of the downlink transfer of this cell base station with the downlink transfer that is different from neighbor base station the cross interference of the downlink transfer of this cell base station;
5. survey and disturb UE according to following double mode reporting measurement result respectively:
A) pattern one: survey and disturb UE to serving base stations report CQI (channel quality indication, Channel Quality Indicator), the downlink transfer of reflection neighbor base station is to the interference of the downlink transfer generation of Serving cell;
B) pattern two: survey and to disturb the measurement result of UE to serving base stations report " subframe is staggered to be disturbed ", the interference that the uplink of disturbing UE produces the downlink transfer of Serving cell is executed in reflection;
6. survey and disturb the base station through backhaul interface (comprising interfaces such as X2, S1), notice is executed and is disturbed its " subframe is staggered to be disturbed " measurement result that obtains of base station, as the reference data of consulting flexible configuration TDD ascending-descending subframes ratio, the network optimization etc. between the base station;
7. one of subscheme of the present invention, i.e. " based on the inter base station interference measurement scheme of MBSFN subframe " possesses following characteristic:
A) this scheme is specified the time-frequency position of the data field of MBSFN subframe as " measurement collection of illustrative plates ";
B) this scheme is utilized the silent status of the UE of MBSFN subframe formation, lets executing of " drafting " disturb the base station pilot signal transmitted, and disturbed base station receives this signal and also assesses its intensity;
C) this scheme utilizes " transmission intercal " that the MBSFN subframe forms in the existing system to carry out " subframe is staggered to be disturbed " measurement, does not influence the UE compatibility;
8. one of subscheme of the present invention promptly " is protected inter base station interference measurement scheme at interval based on the TDD special subframe ", possesses following characteristic:
A) this scheme is specified the TDD special subframe up-downgoing protection time-frequency position of (GP) conduct " measurement collection of illustrative plates " at interval;
B) this scheme is utilized " transmission gap " that GP forms, and lets executing of " drafting " disturb the base station pilot signal transmitted, lets disturbed base station receive this signal and assesses its intensity;
C) this scheme utilizes " transmission intercal " of protection interval (GP) formation of special subframe in the existing system to carry out " subframe is staggered to be disturbed " measurement, does not influence the UE compatibility;
D) this scheme need be surveyed and disturb the base station and execute the range information of disturbing between the base station, according to suitable " the measurement collection of illustrative plates " of this range information configuration, survey is disturbed the interference of base station sub-frame of uplink to avoid executing the special pilot tone of disturbing the base station transmission;
9. one of subscheme of the present invention, i.e. " based on interferometry scheme between the UE of special-purpose ' measurement collection of illustrative plates ' " possesses following characteristic:
A) running time-frequency resource of base station assigns sub-frame of uplink is for surveying " the measurement collection of illustrative plates " of disturbing UE, and survey is disturbed UE and do not carried out transmitting uplink data at measurement frequency spectrum place, and carries out interferometry;
B) survey is disturbed the base station of sub-district, UE place and is executed the configuration that the base station of disturbing sub-district, UE place is coordinated " measurement collection of illustrative plates " each other.Execute the base station scheduling of disturbing sub-district, UE place and execute and disturb UE and send upward signal, simulate " subframe is staggered to be disturbed " in suitable time-frequency domain position, survey disturb sub-district, UE place the base station in same time-frequency domain position scheduling survey and disturb UE and carry out interferometry;
C) measurement result of UE to " subframe is interlocked and disturbed " that its serving base stations report records in the time-frequency position of " measurement collection of illustrative plates " appointment disturbed in survey.
Description of drawings
Fig. 1: " subframe the is staggered to be disturbed " figure in the TDD system
Fig. 2: the general flow chart that " subframe is staggered to be disturbed " measures
Fig. 3: " measurement collection of illustrative plates " figure that utilizes the MBSFN subframe to form
Fig. 4: " subframe is staggered to be disturbed " instrumentation plan between base station based on the MBSFN subframe
Fig. 5: " subframe is staggered to be disturbed " is measured flow chart between the base station based on the MBSFN subframe
Fig. 6: the special subframe protection of TDD system is the action diagram of (GP) at interval
Fig. 7: based on " subframe is staggered to be disturbed " instrumentation plan between special subframe protection base station at interval
Fig. 8: based on " subframe is staggered to be disturbed " flow chart between special subframe protection base station at interval
Fig. 9: " subframe is staggered to be disturbed " instrumentation plan between UE based on special-purpose " measurement collection of illustrative plates "
Figure 10: " subframe is staggered to be disturbed " is measured flow chart between the UE based on special-purpose " measurement collection of illustrative plates "
Embodiment
The present invention utilizes " measurement collection of illustrative plates " formations " transmission gap " for carrying out base station or the UE configuration " measurement collection of illustrative plates " of interferometry, base station or UE can measure flexibly, in real time between base station and base station and (or) " the staggered interference of subframe " between UE and UE.
As shown in Figure 1, " subframe staggered disturb " can be divided into the base station down transmission to " subframe is staggered to be disturbed " (i.e. " descending sub frame is staggered to be disturbed ") of the up reception in base station and UE uplink to " subframe is staggered to be disturbed " of the descending reception of UE (i.e. " sub-frame of uplink interlock interference ").The overall procedure that above-mentioned two kinds " subframe is staggered to be disturbed " measures is as shown in Figure 2.After one of two kinds of measurements of certain mechanism triggering (for example periodic triggers or Event triggered etc.), the present invention carries out interferometry by base station or UE and operates, and measurement result is assessed through configuration specific " measurement collection of illustrative plates ".Need judge the type of this measurement in addition; In this way " subframe is staggered to be disturbed " between the UE (i.e. " sub-frame of uplink is staggered to be disturbed ") is measured; Then need increase step 6 " measurement and report ", disturb UE by survey and report the serving BS at its place to carry out subsequent treatment via " interference assessment " result that step 4 obtains.
Difference according to " subframe is staggered to be disturbed " can adopt distinct methods configuration " measurement collection of illustrative plates ", specifically can be divided into following two types:
One, the base station down transmission is measured " subframe is staggered to be disturbed " of the up reception in base station
" subframe is staggered to be disturbed " measurement flow process is as shown in Figure 3 between the base station.Execute and disturb base station " measurement collection of illustrative plates " identical with disturbed base station configuration, execute and disturb the base station and locate to send downlink measurement pilot frequency at " measurement collection of illustrative plates "; Measurement pilot frequency and assessment " subframe is staggered to be disturbed " intensity are located to receive at " measurement collection of illustrative plates " in disturbed base station.
To the influence of UE and base station compatibility, can select " transmission intercal " formation " measurement collection of illustrative plates " in the regular traffic transmission course in order to reduce to measure " subframe is staggered to be disturbed " as far as possible." transmission gap " be a period of time of having defined in the existing LTE system at interval, during this period of time at interval in, UE need stop the transmission of normal business datum and signaling in order to realize some function." transmission gap " makes UE or base station can utilize this time interval to carry out the measurement of " subframe staggered disturb " and do not influence the compatibility of UE.
" measurement collection of illustrative plates " can be based on " transmission gap " that has defined, also can be special certain new " measurement collection of illustrative plates " for " subframe is staggered to be disturbed " definition.Be that example is explained with " measurement collection of illustrative plates " based on " transmission gap " below.
Scheme one: based on the inter base station interference measurement scheme of MBSFN subframe
1. enforcement principle:
This programme is mainly used in " subframe is staggered to be disturbed " of measuring between base station and base station.
The MBSFN subframe is used at the wireless communication system of a new generation the multimedia multicast broadcasting service being provided.Under the normal condition, in the open MBMS of Serving cell (Multimedia Broadcast Multicast Service, multimedia multicast broadcasting) business, the base station can be the MBSFN subframe through some subframe of all UE of its subordinate of signaled if desired.Authorized user can continue to receive the MBMS business datum that same subframe is carried after receiving public control signaling; And unauthorized user after receiving the control signaling, can not receive the MBMS business datum that same subframe is carried.
In order on the prerequisite that does not influence the UE backwards compatibility, to measure " subframe is staggered to be disturbed ", we use the above-mentioned characteristic of MBSFN subframe, construct " measurement collection of illustrative plates ".The MBSFN subframe structure is as shown in Figure 3 with " measurement collection of illustrative plates " position.
When needs were measured " subframe is staggered to be disturbed ", the base station was through signaling configuration " measurement collection of illustrative plates ".The configuration signal of " measurement collection of illustrative plates " need be accomplished following two work:
A. parameters such as the time-domain position of all UE of informing base station subordinate " subframe staggered disturb " measurement " measurement collection of illustrative plates ", measuring period.Promptly inform all UE of base station subordinate, which subframe is the MBSFN subframe;
B. all UE of base station subordinate are defined as the MBMS unauthorized user.
All UE of base station subordinate will stop to receive follow-up data after receiving the control signaling.Then; Disturb the base station by executing of " drafting " and locate to send special pilot signal at " measurement collection of illustrative plates "; After the disturbed base station process transmission/reception " conversion interval ", convert receiving mode into, in " measurement collection of illustrative plates ", receive to execute and disturb the pilot signal that send the base station; And if " subframe is staggered to be disturbed " take place in the assessment current time, and this interference intensity that possibly reach.The schematic diagram of this programme is as shown in Figure 4:
2. measurement flow process:
Because this scheme has been utilized " the measurement collection of illustrative plates " of the MBSFN subframe formation that has defined in the existing system to simulate " subframe is staggered to be disturbed " and has been measured; Thereby can't destroy the backwards compatibility of UE; And do not measure again after not needing to change the system TDD uplink-downlink configuration earlier, can realize the real-time estimate property measurement of " subframe is staggered to be disturbed ".
As shown in Figure 5, the idiographic flow of scheme one is following:
1) periodicity or event-driven trigger flow process: this flow process can be periodic triggering, so that Serving cell realizes monitoring the situation of " subframe is staggered to be disturbed " semi-staticly; This flow process also can event-driven trigger, and such as when needs are adjusted Serving cell subframe proportion structure, triggers flow process;
2) be divided into two aspects:
2a) configuration " measurement collection of illustrative plates ": " measurement collection of illustrative plates " parameter comprises information such as MBSFN subframe original position, measuring period length." measurement collection of illustrative plates " configuration information can be configured through X2 interface or by network management system by base station in service sector.Wherein the position of MBSFN subframe has stipulated to begin when to measure, and informs to execute and disturb the base station and need send special pilot signal at MBSFN subframe place that disturbed base station converts receiving mode at MBSFN subframe place and measures;
2b) configuration UE MBMS service authority.For fear of carrying out " subframe is staggered to be disturbed " reception measurement pilot frequency of UE mistake when measuring, the base station need be set to unauthorized user to the MBSFN subframe that is comprised at " measurement collection of illustrative plates " by all UE of its subordinate;
3) carry out measurement: disturbed base station is located to receive to execute at " measurement collection of illustrative plates " and is disturbed the special pilot signal that send the base station;
4) interference assessment: disturbed base station is assessed the situation of " subframe is staggered to be disturbed " that is applied according to the special pilot signal that receives.
Scheme two: based on TDD special subframe protection inter base station interference measurement scheme at interval
1. enforcement principle:
This programme is mainly used in " subframe is staggered to be disturbed " of measuring between base station and base station.
The protection of TDD special subframe is used for up-downgoing at interval eats dishes without rice or wine the switching time of treatment conversion, and reserves UE uplink Timing Advance with the realization uplink synchronous, and avoids in cell coverage area because " subframe is staggered to be disturbed " that propagation delay time is shone.Fig. 6 has provided effect sketch map in special subframe protection interval (GP) in the TDD system.Can find out that from this figure if protection is not at interval, A shown in the figure and B place will produce " subframe is staggered to be disturbed ", thereby influence systematic function.
Scheme two with GP as " the measurement collection of illustrative plates " that carry out interferometry.Because GP is transparent for UE, and for the base station, need not to send any data in the GP, the measurement that therefore utilizes GP to carry out " subframe is staggered to be disturbed " can not influence the operate as normal of UE, can guarantee the backwards compatibility of UE.
Fig. 7 is that " the measurement collection of illustrative plates " that utilize GP to form carries out the sketch map that " subframe is staggered to be disturbed " measures.Execute and disturb the base station and in GP, send specific pilot signal; Disturbed base station is set to accepting state in GP, receives executing the pilot signal of disturbing the base station, in this way, if just can dope the intensity of generation " subframe is staggered to be disturbed ".
Executing the pilot signal of disturbing the base station transmission needs certain transmission delay could arrive disturbed base station.Generally, this propagation delay time is that the summation of the normal required GP length of cell coverage area is separately satisfied in two base stations.For fear of executing the pilot tone of disturbing the base station transmission the normal uplink generation of disturbed base station is disturbed, this scheme proposals is executed and is disturbed base station and the long GP length of disturbed base station configuration, and the time-domain position of measurement collection of illustrative plates coordinated with each other.
2. measurement flow process:
Because this scheme has been utilized the protection of the special subframe that has defined in the existing system to simulate " subframe is staggered to be disturbed " at interval and has been measured, and therefore can't destroy the compatibility of UE.In addition, after need not to change the system TDD uplink-downlink configuration earlier, measure again, can realize the real-time estimate property measurement of " subframe is staggered to be disturbed ".
As shown in Figure 8, the idiographic flow of scheme two is following:
1) periodic triggers or Event triggered are measured: can adopt periodic metering system automanual to realize " subframe cross interference " monitoring.If consider the purposes expansion of following GP, also can adopt the metering system of Event triggered to keep certain back compatible property;
2) configuration " measurement collection of illustrative plates ": disturbed base station is disturbed the base station and is carried out Signalling exchange with executing through X2 interface, or by network management system according to some particular demands (for example disturbed base station is to executing the range information of disturbing the base station), dispose suitable " measurement collection of illustrative plates "." measurement collection of illustrative plates " configuration parameter comprises measuring period, carries out the special subframe position of interferometry, executes the information such as starting and ending position that the starting and ending position of disturbing, the interference of disturbed base station measurement are executed in the base station of disturbing;
3) carry out to measure: according to the configuration information of measurement parameter, execute and disturb the base station and in the GP of appointment, send specific pilot signal, disturbed base station is measured in same GP;
4) interference assessment: disturbed base station is assessed " subframe is staggered to be disturbed " of this time simulation according to the strong and weak information that receives pilot signal.
Two, the UE uplink is measured " subframe is staggered to be disturbed " of the descending reception of UE
Between the UE between the method for measurement and base station of " subframe staggered disturb " method of measurement of " subframe is staggered to be disturbed " similar.The base station needs to distribute the running time-frequency resource of sub-frame of uplink to disturb UE " measurement collection of illustrative plates " as survey earlier, and notifies this UE to locate should not carry out transmitting uplink data at this " measurement collection of illustrative plates ", and should carry out interferometry.The relevant parameter of " measurement collection of illustrative plates " is disturbed the base station of sub-district, UE place by survey and is executed the base station of disturbing sub-district, UE place and coordinate to confirm.Execute the base station scheduling of disturbing sub-district, UE place and execute and disturb UE and send upstream data, simulate " subframe is staggered to be disturbed " in suitable time-frequency domain position.The base station scheduling that sub-district, UE place is disturbed in survey is surveyed and is disturbed UE and measure at the time-frequency domain of correspondence, and reports " subframe staggered disturbs " result measured in the time-frequency position of " measurement collection of illustrative plates " regulation.
Scheme three: based on interferometry scheme between the UE of special-purpose " measurement collection of illustrative plates "
1. enforcement principle:
This programme is mainly used in " subframe is staggered to be disturbed " of measuring between UE and UE.
Aforementioned schemes is mainly utilized certain " resource " of having defined in the existing system to carry out " subframe is staggered to be disturbed " and is measured, thereby receives the restriction of the availability aspect (for example, being somebody's turn to do " resource " the operational time cycle etc.) of this " resource ".This programme permission is surveyed and is disturbed the base station according to the actual requirements, is " measurement collection of illustrative plates " that is positioned at any time-frequency domain of UE definition, can let survey disturb UE at the interferometry of the moment and frequency enforcement arbitrarily.
In " measurement collection of illustrative plates " time-frequency domain of configuration, execute and disturb UE and be in up emission state, survey and disturb UE and be in the interferometry state.Execute the upstream data of disturbing UE and can regard " contingent ' subframe is staggered to be disturbed ' " as, disturb UE by survey and receive and accomplish and measure.Disturb the measurement result that UE reports based on survey; Disturbed base station can be under the situation that does not have real " subframe is staggered to be disturbed "; Information is predicted to contingent " subframe is staggered to be disturbed ", so that whether assessment is necessary to adopt different TDD uplink-downlink configuration.
Fig. 9 is the principle schematic of this programme.As shown in the figure, when " subframe is staggered to be disturbed ", the base station need be one " measurement collection of illustrative plates " of single or a plurality of disturbed UE configurations between needs are measured UE.The energy height that disturbed UE receives according to receiver in " measurement collection of illustrative plates " time-frequency domain, assessment are executed and are disturbed the power of UE to " subframe is staggered to be disturbed " of its generation.For fear of when disturbed UE measures interference, other UE uplink signals of its serving BS subordinate are to the influence of interferometry accuracy, and the base station need utilize the existing systems scheduling mechanism, forbid that irrelevant UE carries out transmitting uplink data in " measurement collection of illustrative plates ".
In order to execute " subframe is staggered to be disturbed " assessment result reporting base station of the uplink generation of disturbing UE accurately and real-time; And avoid with existing system in channel quality indication (the Channel Quality Indicator of the descending interference that produces of the reflection neighbor base station that reports of UE; CQI) obscure; The measurement and report that UE is disturbed in survey need report respectively according to two patterns; Be that pattern one is the CQI of reporting base station (pattern that this has supported for existing system), pattern two is executed the uplink interference of disturbing UE for reporting.
2. measurement flow process:
This programme has been realized under the situation that does not have " subframe is staggered to be disturbed ", and " subframe is staggered to be disturbed " between contingent UE is predicted.Its flow chart is shown in figure 10:
The idiographic flow of scheme three is following:
1) triggers: can be periodic triggers or Event triggered.Consider periodic measurement can increase execute disturb UE with (or) energy consumption of disturbed UE, therefore be advisable with Event triggered;
2) relevant parameter of configuration " measurement collection of illustrative plates " is like information such as measuring period, " measurement collection of illustrative plates " time-domain position, " measurement collection of illustrative plates " frequency domain positions;
3) scheduling of Serving cell is coordinated: the purpose that the Serving cell scheduling is coordinated is for fear of the transmitting uplink data that UE is disturbed in other non-surveys of Serving cell the influence that UE carries out interferometry to be disturbed in survey.The base station should utilize existing scheduling mechanism, forbids that non-survey disturbs UE and in " measurement collection of illustrative plates ", send upstream data;
4) executing the scheduling of disturbing the sub-district coordinates: executing the scheduling coordination purpose of disturbing the sub-district is to draw up " suitably " interference environment for " subframe is staggered to be disturbed " measurement mode.Execute and disturb base station and survey and disturb the base station and should carry out information interaction, execute and disturb the base station and should dispatch suitable UE and execute in the time-frequency domain position of " measurement collection of illustrative plates " appointment and disturb through X2 interface;
5) carry out to measure: survey and disturb UE and adjacent sub-district is executed disturb UE uplink signal and measure;
6) survey is disturbed UE " subframe the is staggered to be disturbed " signal that receives is assessed (UE also can select not carry out assessing and direct reporting measurement result);
7) " sub-frame of uplink is staggered to be disturbed " reports: survey is disturbed UE and is reported mechanism according to pattern two, gives base station in service sector with " subframe is staggered to be disturbed " reporting measuring result of assessment;
8) interference assessment is carried out in the base station: the interference assessment report that the base station combines UE to report, and " subframe the is staggered to be disturbed " situation in the scope of the whole base station of comprehensive assessment, thus whether decision launches different TDD uplink-downlink configuration.
The above is merely embodiments of the invention, is not limited to the present invention.The present invention can have various suitable changes and variation.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system; It is characterized in that: this method is measured collection of illustrative plates for user equipment (UE) or one of the base station configuration that need carry out the staggered interferometry of subframe; Utilize the transmission gap of the normal wireless communication of measuring collection of illustrative plates formation to carry out with the staggered interferometry of frequency subframe; Said measurement collection of illustrative plates has been stipulated the resource pattern of one period fixed time and/or assigned frequency; Its time domain unit is an OFDM symbol, and frequency domain unit is minimum frequency domain dispatching unit.
2. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 1 is characterized in that:
In said measurement collection of illustrative plates, execute to disturb the base station or execute and disturb UE and be in emission state, survey and disturb base station or survey and disturb UE and be in the measurement state:
A) execute to disturb the base station or execute and disturb transmitting of UE and can be used as promptly that " subframe of simulation staggered disturb " is tested disturbs base station or survey and disturb UE and receive and measure;
B) survey and to disturb base station or survey and disturb UE through in measuring collection of illustrative plates, disturbing transmitting of UE and measure to executing to disturb the base station or execute; Thereby under the situation that does not have " subframe is staggered to be disturbed ", its intensity is measured and assessed to contingent " subframe is staggered to be disturbed " intensity.
3. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 2; It is characterized in that: pass through the backhaul transport passage between the base station; Configuration for base station or UE coordinated measurement collection of illustrative plates; Comprise the time-frequency granularity of measuring collection of illustrative plates, cycle etc., or carry out above-mentioned configuration through network management system.
4. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 3; It is characterized in that: the base station is for surveying " subframe the is staggered to be disturbed " measurement and report of disturbing UE configuration cycle property or Event triggered; Be used to report survey and disturb " subframe is staggered to be disturbed " measurement result that UE obtains in the time-frequency position of measuring the collection of illustrative plates regulation; This uplink of adjacent area UE of indication measurement is as a result disturbed the common subframe of the downlink transfer of this cell base station with the downlink transfer that is different from neighbor base station the cross interference of the downlink transfer of this cell base station.
5. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 4 is characterized in that: survey and disturb UE according to following double mode reporting measurement result respectively:
A) pattern one: survey and disturb UE to the serving base stations report channel quality indicator (CQI), the downlink transfer of reflection neighbor base station is to the interference of the downlink transfer generation of Serving cell;
B) pattern two: survey and to disturb the measurement result of UE to serving base stations report " subframe is staggered to be disturbed ", the interference that the uplink of disturbing UE produces the downlink transfer of Serving cell is executed in reflection.
6. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 5; It is characterized in that: survey and disturb the base station through the backhaul interface; Notice is executed and is disturbed its " subframe is staggered to be disturbed " measurement result that obtains of base station, as the reference data of consulting flexible configuration TDD ascending-descending subframes ratio, the network optimization etc. between the base station.
7. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 6 is characterized in that: said method of measurement is " based on the inter base station interference measurement scheme of MBSFN subframe ", possesses following characteristic:
A) this scheme is specified the time-frequency position of the data field of MBSFN subframe as the measurement collection of illustrative plates;
B) this scheme is utilized the silent status of the UE of MBSFN subframe formation, lets executing of drafting disturb the base station pilot signal transmitted, and disturbed base station receives this signal and also assesses its intensity;
C) this scheme utilizes the transmission intercal that the MBSFN subframe forms in the existing system to carry out " subframe is staggered to be disturbed " measurement, does not influence the UE compatibility.
8. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 6 is characterized in that: said method of measurement is " based on TDD special subframe protection inter base station interference measurement scheme at interval ", possesses following characteristic:
A) this scheme specifies TDD special subframe up-downgoing protection at interval as the time-frequency position of measuring collection of illustrative plates;
B) this scheme is utilized the transmission gap that GP forms, and lets executing of drafting disturb the base station pilot signal transmitted, lets disturbed base station receive this signal and assesses its intensity;
C) this scheme utilizes the transmission intercal that the protection of special subframe forms at interval in the existing system to carry out " subframe is staggered to be disturbed " measurement, does not influence the UE compatibility;
D) this scheme need be surveyed and disturb the base station and execute the range information of disturbing between the base station, according to the suitable measurement collection of illustrative plates of this range information configuration, survey is disturbed the interference of base station sub-frame of uplink to avoid executing the special pilot tone of disturbing the base station transmission.
9. the staggered method for real-time measurement that disturbs of the subframe in the TDD communication system as claimed in claim 6 is characterized in that: said method of measurement is " based on interferometry scheme between the UE of special-purpose ' measurement collection of illustrative plates ' ", possesses following characteristic:
A) running time-frequency resource of base station assigns sub-frame of uplink is for surveying the measurement collection of illustrative plates of disturbing UE, and survey is disturbed UE and do not carried out transmitting uplink data at measurement frequency spectrum place, and carries out interferometry;
B) survey base station of disturbing sub-district, UE place and the configuration of executing the mutual coordinated measurement collection of illustrative plates in base station of disturbing sub-district, UE place.Execute the base station scheduling of disturbing sub-district, UE place and execute and disturb UE and send upward signal, simulate " subframe is staggered to be disturbed " in suitable time-frequency domain position, survey disturb sub-district, UE place the base station in same time-frequency domain position scheduling survey and disturb UE and carry out interferometry;
C) measurement result of UE to " subframe is interlocked and disturbed " that its serving base stations report records in the time-frequency position of measuring the collection of illustrative plates appointment disturbed in survey.
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