CN101873602A - Interference suppression method of physical upstream control channel (PUCCH) in LTE (Long Term Evolution) system - Google Patents
Interference suppression method of physical upstream control channel (PUCCH) in LTE (Long Term Evolution) system Download PDFInfo
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Abstract
The invention discloses an interference suppression method of a physical upstream control channel (PUCCH) in an LTE (Long Term Evolution) system. The method comprises the following steps of: (a) selecting a multiplexing mode of a CAZAC (Constant Amplitude Zero Auto Correlation) basic sequence between a macro base station and a domestic base station which are configured with the same frequency; (b) selecting a resource coordination method of the PUCCH and selecting a resource multiplexing mode of the PUCCH; (c) correspondingly configuring the domestic base station to the macro base station; and (d) correspondingly acquiring the CAZAC basic sequence of the domestic base station by a cell terminal of the macro base station, then distributing a PUCCH resource to a terminal accessed into the domestic base station and suppressing intercell interference of the PUCCH between the macro base station and the domestic base station. By adopting the method, the intercell Interference of the PUCCH between the macro base station and the domestic base station as well as between the domestic base stations can be eliminated, the intercell Interference can be reduced, and the system resource utilization ratio can be improved.
Description
Technical field
The present invention relates to the communications field, long evolving system (Long-Term Evolution particularly, hereinafter to be referred as LTE) middle Physical Uplink Control Channel (physical uplink control channel, hereinafter to be referred as PUCCH) under the heterogeneous network of macro base station (Macro-eNB) and femtocell (Home-eNB), and a kind of disturbance restraining method between the femtocell.
Background technology
The introducing of femtocell has strengthened indoor covering quality and has improved throughput of system, is the hot issue of next generation wireless communication system.Yet, macro base station and femtocell, and disturb the lifting that has but seriously restricted throughput of system between the femtocell, how to solve macro base station and femtocell, and disturb between the femtocell, the especially interference of physical control channel is a current severe problem that faces.
To up link, the method that current LTE system mainly depends on interference randomization solves the presence of intercell interference of PUCCH.At present LTE system definition two kinds of PUCCH forms be used for the upstream control signaling transmission: form one (Format-1) is used for transmitting and scheduling request (scheduling request, SR) reply (Ack/Nack) with transmission, form two (Format-2) be used for feedback of down channel quality (channel quality indicator, CQI).The both need use the process cyclic shift, and (cyclic shift, cs) the specific constant amplitude zero correlated series (CAZAC) in the sub-district of the length 12 after carries out spread spectrum and demodulation.A PUCCH resource is unique definite by a frequency domain coordinate (being the Resource Block subscript) and a sign indicating number territory coordinate (be the cs value, also comprise a Walsh code for form one).All PUCCH constitute the ascending control channel space of a logic in the sub-district, and each control channel has a unique coordinate
C={1,2} presentation format one or form two.(Resource Block, mapping RB) as shown in Figure 1 for this logic channel space and frequency domain resource piece.
Current LTE system definition 30 group length be 12 CAZAC basic sequence, one group of CAZAC basic sequence is selected according to following formula in each sub-district:
u＝(f
gh(n
s)+f
ss)mod30 (1.1)
Wherein, u is the group number of basic sequence, f
Gh(n
s) be the group skipped mode,
For the physical-layer cell identifier of sub-district (Physical Cell Identity, PCI).
When on same RB, transmitting upstream control signaling with the different terminals in the sub-district (UE), because what use is the CAZAC sequence that generates by different cs from same basic sequence, therefore quadrature always between these different CAZAC sequences is not so exist interference between different UEs.
And between different districts, because the CAZAC sequence that behind cs, obtains of CAZAC basic sequence and non-orthogonal on the same group not.When therefore the terminal of different districts is transmitted upstream control signaling on same RB, exist each other and disturb.The method that current LTE system mainly depends on interference randomization suppresses the presence of intercell interference of Physical Uplink Control Channel (PUCCH).
Yet, when introducing the heterogeneous network of macro base station and femtocell, there is following problem:
1, macro base station and femtocell, and the distance between the femtocell are far smaller than the distance between traditional macro base station.
2, the transmitting power of macro base station and femtocell differs greatly, and femtocell often is in the coverage of macro base station.
3, at a distance of nearer different terminals, because the base station difference (comprising macro base station or femtocell) that inserts causes transmitting power to differ greatly.
Therefore, the intensity of the inter-cell interference signals in the heterogeneous network is significantly greater than the interference strength under traditional macro base station.Cause the method for this interference randomization can't solve Physical Uplink Control Channel (PUCCH) at macro base station and femtocell, and the interference between the femtocell.
Present this problem can be passed through frequency division multiplexing (FDM) mode and partly solve, but FDM has reduced the resource utilization of system: at first, macro base station and femtocell carry out multiplexing on frequency to PUCCH, the system that strengthened is used to control the resource overhead of signaling, thereby has reduced the availability of frequency spectrum.Secondly, the least unit of FDM is RB.But consider the interior number of users of femtocell seldom, the granularity of RB is then too big---under the situation of general cyclic prefix, each RB can provide the PUCCH resource (PUCCH format-1) of maximum 36 forms one, or the PUCCH resource of 12 forms two (PUCCH format-2).
Summary of the invention
At above problem, main purpose of the present invention is to provide a kind of and is used for macro base station and femtocell, and the inter-cell interference cancellation technology of the PUCCH between the femtocell, to reduce presence of intercell interference and to improve resource utilization ratio.
The embodiment of the invention provides the disturbance restraining method of Physical Uplink Control Channel in the LTE system, and it comprises step:
A, between with the macro base station and femtocell frequently disposed, select the multiplex mode of CAZAC basic sequence, be used to use same group of CAZAC basic sequence, produce the CAZAC of described macro base station and described femtocell Physical Uplink Control Channel separately;
The resource coordination method of b, selection Physical Uplink Control Channel, and the resource multiplex mode of selecting Physical Uplink Control Channel;
C, according to the multiplex mode of the CAZAC basic sequence of selecting among the step a, and the resource coordination method of the Physical Uplink Control Channel of selecting among the step b and resource multiplex mode, the described femtocell of described macro base station corresponding configuration;
D, according to the multiplex mode of the CAZAC basic sequence of selecting among the step a, the corresponding CAZAC basic sequence that obtains described femtocell of described macro base station cell terminal, for inserting the terminal distribution physical uplink control channel resource of described femtocell, suppress the presence of intercell interference of Physical Uplink Control Channel between described macro base station and the femtocell then.
Preferably, also comprised step a1 before step a, macro base station is carried out the network planning, comprise configuration CGI, PCI distributes physical uplink control channel resource.
Preferably, before step c, also comprise step c1, described femtocell is carried out initialization operation, comprise the detection neighbor cell, establish a communications link with described macro base station.
Preferably, comprising also before the steps d that eating dishes without rice or wine between steps d 1, the described macro base station of calculating and the described femtocell postpones to realize macro base station terminal and femtocell terminal uplink synchronous.
In the step a of said method, between with macro base station of disposing frequently and femtocell, select the multiplex mode of CAZAC basic sequence to comprise following two kinds:
One, the PCI that distributes macro base station and femtocell by regularization;
Two, the employed CAZAC basic sequence of broadcasting this sub-district PUCCH in described femtocell.
Further, in the step b of said method, select the resource coordination method of Physical Uplink Control Channel, be used for specifically comprising semi-static resource allocation method and Dynamic Resource Allocation for Multimedia method in the resource allocation of coordinating the Physical Uplink Control Channel between different terminals between the base station.
Further, in the step b of said method, select the resource multiplex mode of Physical Uplink Control Channel specifically to comprise following three kinds:
One, distribution or multiplexing minimum PUCCH resource are given femtocell, to maximize available transmitting uplink data channel resource;
Two, multiplexing identical frequency domain resource piece between described macro base station and femtocell makes the logical space of the Physical Uplink Control Channel that described femtocell can use bigger;
Three, the mode of using a kind of FDM to mix with CDM is distributed the physical uplink control channel resource of femtocell.
Further again, in described step c, according to first kind that adopts among the step a multiplex mode by the PCI of regularization distribution macro base station and femtocell, then described macro base station also needs for described femtocell distributes PCI, is configured described femtocell operation.
Further, in described steps d, when being the terminal distribution physical uplink control channel resource of the described femtocell of access, carry out the resource coordination of Physical Uplink Control Channel if select the Dynamic Resource Allocation for Multimedia method, then by described macro base station distributing terminals uplink control channel resource, otherwise distribute by described femtocell.
Certainly, method of the present invention also can be used in between a plurality of femtocells of disposing frequently, suppresses the presence of intercell interference of Physical Uplink Control Channel between a plurality of described femtocells.It realizes that principle is identical with the application between macro base station and femtocell.
Adopt method provided by the invention, can effectively eliminate presence of intercell interference and improve resource utilization ratio.When the terminal of different districts, the terminal that for example inserts femtocell and the terminal that inserts macro base station during transmitting uplink control information, can be given different terminals by distributing different frequency domain resource pieces (RB) simultaneously, make both quadratures on frequency domain; Also can give different terminals, make both quadratures on the sign indicating number territory by the different cs sequences of go up dividing a CAZAC basic sequence of adapted at same frequency domain resource piece (RB).Because this orthogonality, when different terminals simultaneously during transmitting uplink control information, the presence of intercell interference between them is similar to interference in the sub-district of existing LTE system, thereby can use existing technology to eliminate.
Further, in order to reach better interference demodulation performance, femtocell should pass through its subsidiary up transmitter, or by terminal to report, the delay on obtaining eating dishes without rice or wine between femtocell and the macro base station.This delay is used to carry out the up clock control of terminal in the femtocell, makes that macro base station terminal (MUE) keeps uplink synchronous with femtocell terminal (HUE) at the receiving terminal of femtocell.
Description of drawings
Accompanying drawing is used for assisting further understanding of the present invention is constituted a part of the present invention.Be used from explanation the present invention with implementing use-case one, be not construed as limiting the invention.Wherein:
Fig. 1 is the mapping graph of PUCCH logical space and frequency domain RB in the prior art.
Fig. 2 is the flow chart of the inventive method embodiment one.
Fig. 3 is the flow chart of the inventive method embodiment two.
Fig. 4 is the macro base station of multiplexing scheme one among the inventive method embodiment two and the PUCCH resource frequency domain configuration figure of Home eNodeB.
Fig. 5 is the PUCCH logic channel space of multiplexing scheme one among the inventive method embodiment two and the mapping graph of frequency domain RB.
Fig. 6 is the macro base station of multiplexing scheme two among the inventive method embodiment two and the PUCCH resource frequency domain configuration figure of Home eNodeB.
Fig. 7 is the PUCCH logic channel space of multiplexing scheme two among the inventive method embodiment two and the mapping graph of frequency domain RB.
Fig. 8 is the macro base station of multiplexing scheme three among the inventive method embodiment two and the PUCCH resource frequency domain configuration figure of Home eNodeB.
Fig. 9 is the PUCCH logic channel space of multiplexing scheme three among the inventive method embodiment two and the mapping graph of frequency domain RB.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, but embodiment does not limit protection scope of the present invention.
As shown in Figure 2, the embodiment of the invention one provides the disturbance restraining method of Physical Uplink Control Channel in a kind of LTE system, and it comprises:
The resource coordination method of step 102, selection Physical Uplink Control Channel, and the resource multiplex mode of selecting Physical Uplink Control Channel;
As shown in Figure 3, as a kind of improved execution mode, the embodiment of the invention two provides the disturbance restraining method of Physical Uplink Control Channel in a kind of LTE system, and it comprises:
Between with the macro base station and femtocell disposed frequently, use same group of CAZAC basic sequence, be used to produce the CAZAC of macro base station and femtocell PUCCH separately.On these sub-districts, do not use the group turn function of CAZAC.After selecting same group of CAZAC basic sequence for use, can be configured on the identical or different frequency domain resource pieces (RB) with the PUCCH of femtocell with the macro base station of disposing frequently.
Concrete, between with macro base station of disposing frequently and femtocell, select for use same group of CAZAC basic sequence that following two kinds of schemes are arranged, network engineering personnel need select a kind of arrangements macro base station by it.
Scheme one, distribute the PCI of macro base station and femtocell by regularization.
The PCI of macro base station distributes according to the network planning, or generates automatically.The PCI of femtocell is then distributed by macro base station.Communicate between macro base station and the femtocell, the PCI of available femtocell is determined by following formula:
Wherein
Be the PCI of i available femtocell,
PCI for macro base station.When the Radio Link loss between two femtocells big (thereby disturbing very little), can shared same PCI
In suc scheme, terminal (UE) obtains the used CAZAC basic sequence of sub-district PUCCH by the PCI that monitors femtocell.
Scheme two, in described femtocell broadcasting this sub-district PUCCH employed CAZAC basic sequence.
In system information block (SIB), increase a new territory (5 bit) and be used to represent the employed CAZAC basic sequence in sub-district (scope 0～29).Femtocell terminal (HUE) is determined the employed CAZAC basic sequence of sub-district PUCCH by monitoring this territory.The employed CAZAC basic sequence of femtocell is distributed by macro base station.
The resource coordination method of step 203, selection Physical Uplink Control Channel.Present embodiment provides the resource coordination method of PUCCH between semi-static and dynamic two kinds of base stations, and network engineering personnel need select a kind of arrangements macro base station by it.
One, semi-static resource allocation methods.Macro base station is the resource (subclass that comprises cs and RB) that femtocell is reserved a part of PUCCH.Initialized the time, femtocell set up with macro base station between be connected, to obtain the subset of resources that is used for femtocell PUCCH.The semi-static resource allocation methods of minizone comprises following step:
A, macro base station are reserved a part of resource for the femtocell in its covering and are used for PUCCH.This reserved resource can be specified when the network planning, also can be distributed automatically by macro base station.
When b, femtocell initialization,, or pass through terminal to report by downlink receiver subsidiary on it, determine sub-district overall identification (the Cell Global Identifier of the macro base station of its subordinate, CGI), and on every side the sign of detected other sub-districts (PCI, CGI) and signal strength signal intensity.
C, femtocell and macro base station are set up communication link, and report its information (comprising CGI, geographical location information etc.), and detected other cell informations among the step b.
D, femtocell dispose to macro base station request PUCCH.
E, macro base station are femtocell configuration PUCCH, and distribute a subclass to give this femtocell from its reserved resource according to its reserved resource, distribute the PCI of femtocell simultaneously.
Two, dynamic resource allocation method.In suc scheme, macro base station is responsible for all the terminal distribution PUCCH resources in its coverage, comprises terminal that inserts femtocell and the terminal that inserts macro base station.The dynamic resource allocation method of minizone comprises following step:
When a, femtocell initialization,, or, determine the CGI of the macro base station of its subordinate by terminal to report by downlink receiver subsidiary on it, and on every side the sign of detected other sub-districts (PCI, CGI) and signal strength signal intensity.
B, femtocell and macro base station are set up communication link, and report its information (comprising CGI, geographical location information etc.), and detected other information among the step a.
C, femtocell dispose to macro base station request PUCCH.
D, macro base station are femtocell configuration PUCCH, and distribute the PCI of femtocell.
E, when terminal attempt to insert femtocell, after by authentication, femtocell is to the PUCCH resource of this terminal of macro base station request.
F, macro base station are this terminal distribution PUCCH resource, and issue femtocell.
The resource multiplex scheme of step 204, selection Physical Uplink Control Channel.The embodiment of the invention provides three kinds of schemes of multiplexing PUCCH resource between macro base station and femtocell, and network engineering personnel need select a kind of arrangements macro base station by it.
Multiplexing scheme one as Fig. 4 and shown in Figure 5, can distribute or multiplexing PUCCH resource of trying one's best few is given femtocell, to maximize available transmitting uplink data channel resource.The quadrature (being different cs sequences) that terminal between different districts depends on yard territory suppresses to disturb.Scheme one provides the higher availability of frequency spectrum when keeping better anti-disturbance performance, can be applicable to most of scene.
Multiplexing scheme two, as Fig. 6 and shown in Figure 7, can be at multiplexing identical RB between macro base station and femtocell, because such scheme one relatively, the PUCCH logical space that femtocell can be used is bigger, thereby the terminal between different districts can better be disturbed rejection.When wireless channel disturbs too by force, in the time of need be than the better interference free performance of scheme one, can adopt this scheme.
Multiplexing scheme three, as Fig. 8 and shown in Figure 9, the mode that can use a kind of FDM to mix with CDM is distributed the PUCCH resource of femtocell.At this moment, the part femtocell relies on frequency division and suppresses the ascending control channel interference, and part femtocell dependence sign indicating number divides and suppresses the ascending control channel interference.When the growth of the quantity of femtocell surpasses planning, cause dividing timing inadequately by the aforementioned schemes reserved resource, can further adopt this scheme.
Specify above-mentioned three multiplexing schemes by 3 embodiment respectively below:
The above-mentioned multiplexing scheme one of example 1 corresponding explanation: suppose in the enforcement environment of this simplification, by planning, to in macro base station, distribute RB0 to be used for the PUCCH of form two, distribute RB1, RB48, RB49 are used for the PUCCH of form one, and reserve form one transmission that 30 cs values are used for femtocell, and 6 cs values are used for form two transmission of femtocell, then must implement according to the following steps:
1, according to the network planning, the PUCCH of configuration macro base station:
1.1, be used for PUCCH for macro base station distributes 4 RB among 50 RB altogether, wherein RB0 is used for form two control channels, RB1, RB48, RB49 are used for the control channel of form one.
1.2, RB0 has 12 form two channels
Reserve 6 be used for femtocell (as
).
1.3, RB1, RB48, RB49 have 108 form one channels, suppose the descending N that disposes altogether of macro base station
CCEIndividual available CCE then keeps N
CCEIndividual channel
The dynamic Ack/Nack that is used for macro base station reserves 30 and is used for femtocell
2, the PUCCH of macro base station configuration femtocell:
2.1, be used for PUCCH for femtocell distributes 2 RB among 50 RB altogether, wherein RB0 is used for form two control channels, RB1 is used for the control channel of form one.
2.2, macro base station is from form two resources of its reservation
Middle femtocell form two resources of distributing.
2.3, macro base station is from form one resource of its reservation
Middle femtocell form one resource of distributing.
The allocation result of this embodiment 1 is shown in Figure 4 and 5.Fig. 4 is the allocation result of RB, and Fig. 5 is the PUCCH space of logic and the mapping of frequency domain RB under this distribution.Under this profile instance, macro base station can be used for being designated as 2 under the continuous RB of transmitting uplink data, 3...47, and femtocell can be used for being designated as 1,2...48 under the continuous RB of transmitting uplink data.System resource gets the maximum use.
The above-mentioned multiplexing scheme two of example 2 corresponding explanations: suppose in the enforcement environment of this simplification, by planning, to in macro base station, distribute RB0 to be used for the PUCCH of form two, distribute RB1, RB48, RB49 are used for the PUCCH of form one, and reserve form one transmission (wherein the femtocell resource of Yu Liuing can be striden the RB distribution) that 40 cs values are used for femtocell, and 6 cs values are used for form two transmission of femtocell, then must implement according to the following steps:
1, according to the network planning, the PUCCH of configuration macro base station:
1.1, be used for PUCCH for macro base station distributes 4 RB among 50 RB altogether, wherein RB0 is used for form two control channels, RB1, RB48, RB49 are used for the control channel of form one.
1.2, RB0 has 12 form two channels
Reserve 6 be used for femtocell (as
).
1.3, RB1, RB48, RB49 have 108 form one channels, suppose the descending N that disposes altogether of macro base station
CCEIndividual available CCE then keeps N
CCEIndividual channel
The dynamic Ack/Nack that is used for macro base station reserves 40 and is used for femtocell
2, the PUCCH of macro base station configuration femtocell:
2.1, be used for PUCCH for femtocell distributes 4 RB among 50 RB altogether, wherein RB0 is used for form two control channels, RB1, RB48 are used for the control channel of form one.
2.2, macro base station is from form two resources of its reservation
Middle femtocell form two resources of distributing.
2.3, macro base station is from form one resource of its reservation
Middle femtocell form one resource of distributing.
The allocation result of this embodiment 2 is shown in Fig. 6 and 7.Fig. 6 is the allocation result of RB, and Fig. 7 is the PUCCH space of logic and the mapping of frequency domain RB under this distribution.Under this profile instance, terminal can be dispersed among a plurality of RB to obtain the better resisting interference performance.
The above-mentioned multiplexing scheme three of example 3 corresponding explanations: suppose further to implement multiplexing scheme three on the basis of example 1, then the allocation result of this embodiment 3 is shown in Fig. 8 and 9.Promptly on the distribution basis of example 1, increase RB2, RB47 is used for the PUCCH of femtocell.
Concrete, scheme and the multiplexing CAZAC basic sequence of femtocell that described macro base station is selected according to step 202.If wherein select first kind of scheme by the PCI of regularization distribution femtocell to reuse the CAZAC basic sequence in step 202, then macro base station need be that femtocell distributes PCI in this step, is configured described femtocell operation.
According to mobile network's networking requirement, described macro base station is according to the resource coordination method of the Physical Uplink Control Channel of selecting in the step 203, and the resource multiplex scheme of the Physical Uplink Control Channel of selecting in the step 204, be femtocell configures physical uplink control channel resource.
Eating dishes without rice or wine between step 207, calculating macro base station and the described femtocell postpones, to realize macro base station terminal and femtocell terminal uplink synchronous.Its Calculation Method adopts prior art.
Wherein in step 203 when when inserting the terminal distribution physical uplink control channel resource of described femtocell, carry out the resource coordination of Physical Uplink Control Channel if select the Dynamic Resource Allocation for Multimedia method, then in step 209 by described macro base station distributing terminals uplink control channel resource, otherwise distribute by femtocell.
The specific embodiment three of the inventive method is as follows:
Supposing has a macro base station (being designated as M1) and two femtocells (being designated as H1 and H2) in the enforcement environment of this simplification.For distributing 4 RB to be used for PUCCH, wherein RB0 is used for form two control channels to M1 in whole 50 RB, RB1, and RB48, RB49 are used for the control channel of form one.Reserve form one transmission (10 are used for H1) that 30 cs are used for femtocell, 6 cs are used for form two transmission (1 is used for H1) of femtocell.In this example, selecting semi-static distribution method for use is that femtocell distributes the PUCCH resource, and distributes the scheme of the PCI of femtocell to reuse the CAZAC basic sequence by regularization, then:
1, according to the network planning, configuration M1:
1.1, distribute or generate macro base station PCI automatically for M1.
1.2, according to planning, selective rule divides the scheme of the PCI that joins femtocell and reuses the CAZAC basic sequence.
1.3, according to planning, select semi-static PUCCH resource coordination scheme.
1.4, according to planning, select by scheme one multiplexing PUCCH resource, M1 reserves form one transmission that 30 cs are used for femtocell in RB0,6 cs of reservation are used for form two transmission of femtocell in RB49.
2, during the H1 initialization,, detect the M1 of its subordinate by its subsidiary downlink receiver, and adjacent H2 and signal strength signal intensity RP2 thereof.
3, H1 and M1 set up communication link, and report its information (comprising CGI, geographical position etc.), and detected H2 cell information and signal strength signal intensity RP2 thereof in the step 2.
4, H1 is to M1 request PUCCH configuration.
5, M1 assessing signal intensity RP2 thinks to have stronger interference between H1 and H2.
6, M1 is according to its reserved resource, for femtocell 2 RB of configuration (RB0, RB49) are used for PUCCH.
6.1, wherein RB0 is used for the control channel of form two, RB49 is used for the control channel of form one.
6.2, M1 distributes 10 to give this femtocell from 30 cs values of the form one of its reservation, distributes 1 to this femtocell again from 6 cs values of the form two of its reservation.These resources of distributing to H1 are different with dispensing H2's.
7, M1 by formula (1.2) generate H1's
If the PCI that H2 has distributed is
Then
Be that H1 is assigned with different PCI with H2.H1 is according to distributing
Obtain the used CAZAC basic sequence in sub-district.
8, M1 distributes an ascending channel detecting reference signal (SRS) to give H1.
9, H1 sends SRS to M1 by its upstream transmitter, and M1 is used as the SRS of ordinary terminal to the SRS of H1, and the algorithm that postpones by the ascending idle port between existing computing terminal of industry and base station is calculated the delay on eating dishes without rice or wine between it and the H1, and the result is sent back to H1.
10, when terminal attempted inserting H1, it was by H1's
Obtain the used CAZAC basic sequence in sub-district.After by authentication, H1 be this terminal distribution form one and form two resources from its available PUCCH resource, and obtain with previous step time of delay configurating terminal Timing Advance (Time Advance, TA).
The specific embodiment four of the inventive method is as follows:
Suppose in the enforcement environment of this simplification, to have a macro base station (being designated as M1) and two femtocells (being designated as H1 and H2).Be used for PUCCH for M1 distributes 4 RB among 50 RB altogether, wherein RB0 is used for form two control channels, RB1, and RB48, RB49 are used for the control channel of form one.In this example, selecting dynamic distribution method for use is that femtocell distributes the PUCCH resource, and broadcasts the used CAZAC basic sequence of femtocell in system information block, then:
1, according to the network planning, for M1 distributes or generates macro base station PCI automatically
1.1, according to planning, be chosen in the scheme of broadcasting in the system information block and reuse the CAZAC basic sequence
1.2, according to planning, select dynamic PUCCH resource coordination scheme
1.3, according to planning, select by scheme two multiplexing PUCCH resources
2, during the H1 initialization,, detect the M1 of its subordinate by downlink receiver subsidiary on it, and H2 on every side and signal strength signal intensity RP2 thereof.
3, H1 and M1 set up communication link, and report its information (comprising CGI, geographical position etc.), and detected H2 cell information and signal strength signal intensity RP2 thereof in the step 2.
4, H1 is to M1 request PUCCH configuration.
5, M1 is used for PUCCH (identical with M1) for 4 RB of configuration (RB0, RB1, RB48, RB49): wherein RB0 is used for form two control channels, RB1, and RB48, RB49 are used for the control channel of form one.
6, the used CAZAC basic sequence in M1 notice H1 sub-district.
7, H1 broadcasts the CAZAC basic sequence that obtains from M1 in the previous step in system information block.
8, M1 distributes a up channel SRS to give H1.
9, H1 calculates delay on eating dishes without rice or wine between it and the H1 for M1, M1 by its upstream transmitter transmitting channel SRS, and the result is sent back to H1.
10, when terminal attempted inserting H1, it obtained the used CAZAC basic sequence in sub-district by the system information block of H1 broadcasting.
11, after terminal was by authentication, H1 asked the PUCCH resource of this terminal to M1.
12, the resource (form one and form two) that from all PUCCH RB, can use of M1 for this terminal distribution, and issue H1.
13, the channel resource configurating terminal ascending control channel that distributes with M1 of H1, and with obtain in the step 9 time of delay configurating terminal TA.
Need to prove, though the foregoing description has only been described and implemented method of the present invention between macro base station and femtocell, yet because the CAZAC basic sequence of the PUCCH channel of macro base station and femtocell use is identical, and the close together between the femtocell of phase mutual interference, thereby can realize that uplink is synchronous, therefore adopt the method for the above embodiment of the present invention also to can be used for eliminating presence of intercell interference on the PUCCH channel between a plurality of femtocells, improve resource utilization ratio.The principle of its realization is the same with the presence of intercell interference of eliminating the PUCCH channel between macro base station and the femtocell, repeats no more here.
Adopt method provided by the invention, can effectively eliminate presence of intercell interference and improve resource utilization ratio.When the terminal of different districts, the terminal that for example inserts femtocell and the terminal that inserts macro base station during transmitting uplink control information, can be given different terminals by distributing different frequency domain resource pieces (RB) simultaneously, make both quadratures on frequency domain; Also can give different terminals, make both quadratures on the sign indicating number territory by the different cs sequences of go up dividing a CAZAC basic sequence of adapted at same frequency domain resource piece (RB).Because this orthogonality, when different terminals simultaneously during transmitting uplink control information, the presence of intercell interference between them is similar to interference in the sub-district of existing LTE system, thereby can use the existing technology of industry to eliminate.
Further, in order to reach better interference demodulation performance, femtocell should pass through its subsidiary up transmitter, or by terminal to report, the delay on obtaining eating dishes without rice or wine between femtocell and the macro base station.This delay is used to carry out the up clock control of terminal in the femtocell, makes that macro base station terminal (MUE) keeps uplink synchronous with femtocell terminal (HUE) at the receiving terminal of femtocell.
Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvement and change, these improvement and change also are considered as protection scope of the present invention.Need to prove that these are used and all belong to protection range of the present invention.
Claims (9)
1.LTE the disturbance restraining method of Physical Uplink Control Channel is characterized in that in the system, comprises step:
A, between with the macro base station and femtocell frequently disposed, select the multiplex mode of CAZAC basic sequence, be used to use same group of CAZAC basic sequence, produce the CAZAC of described macro base station and described femtocell Physical Uplink Control Channel separately;
The resource coordination method of b, selection Physical Uplink Control Channel, and the resource multiplex mode of selecting Physical Uplink Control Channel;
C, according to the multiplex mode of the CAZAC basic sequence of selecting among the step a, and the resource coordination method of the Physical Uplink Control Channel of selecting among the step b and resource multiplex mode, the described femtocell of described macro base station corresponding configuration;
D, according to the multiplex mode of the CAZAC basic sequence of selecting among the step a, the corresponding CAZAC basic sequence that obtains described femtocell of described macro base station cell terminal, for inserting the terminal distribution physical uplink control channel resource of described femtocell, suppress the presence of intercell interference of Physical Uplink Control Channel between described macro base station and the femtocell then.
2. according to the described method of claim 1, it is characterized in that, before step a, also comprise step
A1, macro base station is carried out the network planning, comprise configuration CGI, PCI distributes physical uplink control channel resource.
3. according to the described method of claim 1, it is characterized in that, before step c, also comprise step
C1, described femtocell is carried out initialization operation, comprise the detection neighbor cell, establish a communications link with described macro base station.
4. according to the described method of claim 1, it is characterized in that, before steps d, also comprise step
Eating dishes without rice or wine between d1, the described macro base station of calculating and the described femtocell postpones to realize macro base station terminal and femtocell terminal uplink synchronous.
5. according to any described method of claim 1 to 4, it is characterized in that, among the described step a, between with macro base station of disposing frequently and femtocell, select the multiplex mode of CAZAC basic sequence to comprise following two kinds:
One, the PCI that distributes macro base station and femtocell by regularization;
Two, the employed CAZAC basic sequence of this sub-district Physical Uplink Control Channel of broadcasting in described femtocell.
6. according to any described method of claim 1 to 4, it is characterized in that, select the resource coordination method of Physical Uplink Control Channel among the described step b, be used for specifically comprising semi-static resource allocation method and Dynamic Resource Allocation for Multimedia method in the resource allocation of coordinating the Physical Uplink Control Channel between different terminals between the base station.
7. according to any described method of claim 1 to 4, it is characterized in that, select the resource multiplex mode of Physical Uplink Control Channel specifically to comprise following three kinds among the described step b:
One, distribution or multiplexing minimum physical uplink control channel resource are given femtocell, to maximize available transmitting uplink data channel resource;
Two, multiplexing identical frequency domain resource piece between described macro base station and femtocell makes the logical space of the Physical Uplink Control Channel that described femtocell can use bigger;
Three, the mode of using a kind of FDM to mix with CDM is distributed the physical uplink control channel resource of femtocell.
8. according to any described method of claim 1 to 4, it is characterized in that, in described step c, according to first kind that adopts among step a multiplex mode that distributes the PCI of macro base station and femtocell by regularization, then described macro base station also needs to be configured the operation of described femtocell for described femtocell distributes PCI.
9. according to any described method of claim 1 to 4, it is characterized in that, in described steps d, when being the terminal distribution physical uplink control channel resource of the described femtocell of access, carry out the resource coordination of Physical Uplink Control Channel if select the Dynamic Resource Allocation for Multimedia method, then by described macro base station distributing terminals uplink control channel resource, otherwise distribute by described femtocell.
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