CN102196442A - Physical cell ID allocating method and device - Google Patents

Abstract

The invention discloses a physical Cell ID (PCI) allocating method and device. The method comprises the following step of reallocating a new PCI to a newly built cell when a PCI value (NIDNcell) of the newly built cell and a PCI value (NIDNbcell) of a neighboring cell with same frequency as that the newly built cell meet a congruence relationship. When the method and device in the invention are adopted, the mutual interference of reference signals of neighboring cells with same frequency as that of the newly built cell due to improper PCI allocation can be known, and can be effectively overcome.

Description

Method and device that a kind of physical district ID distributes

Technical field

The present invention relates to moving communicating field, relate in particular to a kind of physical district ID (Physical CellIdentification, distribution technique PCI).

Background technology

Long Term Evolution (Long Term Evolution, LTE) in the communication system, cell reference signals is mainly used to carry out channel estimating and correlation demodulation; In actual applications,, can cause that the reference signal between the adjacent sub-district produces more serious phase mutual interference, cause the result of channel estimating inaccurate, thereby influence the stability of whole system if the frequency domain position of the reference signal of co-frequency neighbor cell is identical.

The frequency domain position of cell reference signals is relevant with physical district ID, and its time domain relation and frequency domain relation is respectively:

k＝6m+(v+v _shift)mod6

$l=\left\{\begin{array}{cc}0,N_{\mathrm{symb}}^{\mathrm{DL}}-3& \mathrm{ifp}\∈\left\{\mathrm{0,1}\right\}\\ 1& \mathrm{ifp}\∈\left\{\mathrm{2,3}\right\}\end{array}\right.$

$m=\mathrm{0,1},...,2\·N_{\mathrm{RB}}^{\mathrm{DL}}-1$

Wherein, k represents the frequency domain position of reference signal, and l represents the time-domain position of reference signal, N _RB ^DLRepresent downlink bandwidth, N _Symb ^DLRepresent the number of the OFDM symbol in the time slot in the subframe, $v_{\mathrm{shift}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}6$ Represent the frequency displacement of reference signal.

As shown in Figure 1, difference according to PCI, the position of cell reference signals will be different, normal cyclic prefix (cyclic prefix, the time-frequency position of cell reference signals CP) has six kinds, according to prior art, will occur because the difference of PCI, the frequency domain position of the reference signal that causes is difference to some extent, a problem will appear like this, when the positions of cell reference signals of adjacent co-frequency cell was identical, the reference signal of two sub-districts can produce stronger interference, caused producing when the UE of two cell edges carries out channel estimating error.

Summary of the invention

In view of this, the technical problem to be solved in the present invention is to overcome in the assigning process of PCI, the problem of the phase mutual interference between the adjacent co-frequency cell reference signal that causes because of the incorrect distribution of adjacent PCI value.

In order to address the above problem, one aspect of the present invention provides the distribution method of a kind of PCI, comprising: as the PCI of newly-built sub-district value N _IDN ^CellPCI value N with homogeneous-frequency adjacent-domain _IDNb ^CellSatisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6$ The time, then be the new PCI of described newly-built cell allocation one again.

Further, described is the new PCI of described newly-built cell allocation one again, is specially: be the PCI value N of the described suggestion in newly-built sub-district _IDN ^{Cell '}

Further, the described PCI value N that gives the suggestion in newly-built sub-district _IDN ^{Cell '}, be specially: ${N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N}_{\mathrm{IDN}}^{\mathrm{cell}}+1,$ And $N_{\mathrm{IDN}}^{\mathrm{cell}}\≠N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\mathrm{mod}6,$ Wherein $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1$ Be cycle calculations, until N _IDN ^{Cell '}All do not satisfy congruence relations with the PCI value of all homogeneous-frequency adjacent-domains.

Further, when adjacent co-frequency cell is in same eNB, with described N _IDN ^{Cell '}Be kept in this eNB temporarily.

Further, for before described newly-built sub-district provides the PCI value of suggestion, if adjacent co-frequency cell is in an eNB time, described eNB points out this PCI of OMC can cause the interference of adjacent area; If adjacent co-frequency cell is not in same eNB the time, opposite end eNB informs that by the order of X2 message source this PCI of end eNB can cause the interference of adjacent area, and prompting OMC.

The present invention provides a kind of PCI assigned unit on the other hand, comprising: judge module is used to judge the PCI value N of newly-built sub-district _IDN ^CellPCI value N with homogeneous-frequency adjacent-domain _IDNb ^CellWhether satisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6;$

The reallocation module is used for working as $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6$ The time, be the new PCI of described newly-built cell allocation one.

Further, also comprise: reminding module is used to point out the PCI of the newly-built sub-district of OMC can cause the interference of adjacent area reference information.

Further, described reallocation module comprises: the assignment module is used to described newly-built sub-district to compose a new PCI value N again _IDN ^{Cell '}, $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1,$ And $N_{\mathrm{IDN}}^{\mathrm{cell}}\≠N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\mathrm{mod}6,$ Wherein $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1$ Be cycle calculations, until N _IDN ^{Cell '}All do not satisfy congruence relations with the PCI value of all homogeneous-frequency adjacent-domains.

Further, also comprise: memory module is used for when adjacent co-frequency cell is in same eNB, with described N _IDN ^{Cell '}Be kept in this eNB temporarily.

Adopt the used method and apparatus of the present invention, can effectively overcome because of distributing the incorrect of PCI, and cause the phase mutual interference of the cell reference signals of homogeneous-frequency adjacent-domain.

Description of drawings

Fig. 1 be cell reference signals 6 in may distribution map.

Fig. 2 is the process chart of homogeneous-frequency adjacent-domain in an eNB.

Fig. 3 is the not process chart in same eNB of homogeneous-frequency adjacent-domain.

Embodiment

Basic thought of the present invention is to judge whether the PCI of newly-built sub-district and the PCI of co-frequency neighbor cell satisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6,$ If satisfy, the frequency domain position that then proves two cell downlink cell reference signals is identical, can cause the interference of reference signal between these two sub-districts, then be the new PCI value of this mail cell allocation again, so just can prevent to cause the phase mutual interference of cell reference signals because of the distribution of PCI is improper.

Fig. 2 shows the disposition of two co-frequency cells in same eNB, as shown in Figure 2, may further comprise the steps:

Step 1: in an eNB, set up new sub-district, and, can distribute automatically for it distributes PCI, also can manual allocation.

Step 2: judge whether the PCI of this new sub-district and the PCI of adjacent sub-district satisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6,$ If satisfy, the PCI that then proves this distribution can cause the interference of co-frequency neighbor cell reference signal, and then execution in step 3; Otherwise, process ends.

Step 3: (Operation Maintainance Centre, OMC), the distribution of this PCI can cause the co-frequency neighbor cell reference signal-to-interference to this eNB prompting network management system, and provides a PCI value of advising to OMC.

Fig. 3 shows the not disposition in same eNB of two co-frequency cells, as shown in Figure 3, may further comprise the steps:

Step 1: between two eNB, set up the X2 mouth.

Step 2: newly-built sub-district in an eNB (being source end eNB), and be its distribution PCI.

Step 3: source end eNB informs the PCI of this newly-built sub-district of eNB, opposite end by the X2 mouth.

Step 4: whether the PCI of newly-built sub-district can cause the phase mutual interference of co-frequency cell reference signal among the inspection source end eNB;

Particularly, whether the PCI of the adjacent sub-district of the PCI of the newly-built sub-district by judging source end eNB and opposite end eNB satisfies congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6,$ If satisfy, then proof can cause the phase mutual interference of co-frequency cell reference signal, then continues execution in step 5; Otherwise finish to implement.

Step 5: opposite end eNB informs that by the order of X2 message source this PCI of end eNB can cause the interference of adjacent area.

Step 6: source end eNB knows that this PCI can cause the interference between the adjacent co-frequency cell reference signal, and the distribution of prompting OMC this PCI can cause the reference signal-to-interference of homogeneous-frequency adjacent-domain, and the PCI value that provides suggestion is to OMC.

Application Example 1

Below being an Application Example, is the combination of top two kinds of situations:

Initialization: a newly-built sub-district in an eNB, and be this newly-built cell allocation PCI: be made as N _IDN ^Cell, manual or automatic distribution can.

Step 1: travel through the neighboring BS relationship of this newly-built sub-district, if there is the homogeneous-frequency adjacent-domain in this eNB of this sub-district, then execution in step 1.1; If only there is the sub-district in other eNB to do homogeneous-frequency adjacent-domain, then execution in step 2; Wherein, this eNB is meant the eNB at place, newly-built sub-district.

Step 1.1, travel through the PCI of all homogeneous-frequency adjacent-domains: be made as N _IDNb ^Cell, calculate the PCI value of newly-built sub-district and the PCI value of homogeneous-frequency adjacent-domain and whether satisfy congruence relations, promptly $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6,$ If satisfy, then execution in step 1.2; Do not satisfy then execution in step 2;

Step 1.2, provide the PCI value N of a suggestion for newly-built sub-district _IDN ^{Cell '}

Be specially: calculate $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1,$ And guarantee $N_{\mathrm{IDN}}^{\mathrm{cell}}\≠N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\mathrm{mod}6;$

Step 1.3, travel through the PCI of the homogeneous-frequency adjacent-domain in this eNB of this sub-district, whether check and N _IDNb ^{Cell '}Satisfy congruence relations,, then change execution in step 1.2 if satisfy; Otherwise, with N _IDN ^{Cell '}Be kept at this eNB, execution in step 2 temporarily;

Step 2: judge whether newly-built sub-district has the homogeneous-frequency adjacent-domain in other eNB, and between two eNB the X2 mouth is arranged;

Particularly, the information that can pass through the relevant X2 mouth of this eNB preservation is judged; If exist, then execution in step 2.1; Otherwise embodiment finishes.

If step 2.1 N _IDN ^{Cell '}Be not empty, the PCI that then will increase the sub-district newly is changed to N _IDN ^{Cell '}Source end eNB brings opposite end eNB by X2 mouth config update (X2CONFIGURATION UPDATE) signaling with the message that the sub-district increases.Read the N of the sub-district of carrying in the X2CONFIGURATION UPDATE signaling in abutting connection with eNB _IDN ^{Cell '}, calculate the PCI:N of all sub-districts in this eNB respectively _IDNbX2 ^Cell

Whether the PCI that step 2.2, judgement and source end bring satisfies congruence relations $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\≡N_{\mathrm{IDNbX}2}^{\mathrm{cell}}\mathrm{mod}6,$

If satisfy above congruence relations, then PCI is allocated successfully, and returns to source end eNB X2 mouth configuration successful signaling (X2CONFIGURATION ACK); Be enough to congruence relations if be discontented with, then return X2 mouth configuration failure signaling (X2CONFIGURATION FAILURE), inform source end eNB with a specific error code, the distribution of this PCI can cause the interference between the adjacent co-frequency cell reference signal.

After step 2.3, source end eNB receive X2CONFIGURATION ACK signaling, if the N of buffer memory is arranged _IDN ^{Cell '}, then by the agreement between OMC and base station prompting OMC: distribute this PCI can cause interference between the adjacent co-frequency cell reference signal, and provide the PCI value of suggestion: N _IDN ^{Cell '}If there is not the N of buffer memory _IDN ^{Cell '}, then PCI is allocated successfully;

After source end eNB receives X2CONFIGURATION FAILURE signaling, learn that this PCI can cause to produce between the co-frequency neighbor cell reference signal of other eNB to disturb order $N_{\mathrm{IDN}}^{\mathrm{cell}}=N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}},$ Change and carry out the step

Rapid 1.2 recomputate the PCI recommended value.

Application example 2

Based on same inventive concept, a kind of physical district ID assigned unit also is provided in the embodiment of the invention, because the principle of this device solves problem is similar to the method that physical district ID distributes, so the enforcement of this device can repeat part and repeat no more referring to the enforcement of method.

Fig. 4 shows apparatus structure schematic diagram of the present invention, as shown in Figure 4, comprises judge module and reallocation module, and wherein, judge module is used to judge the PCI value N of newly-built sub-district _IDN ^CellPCI value N with homogeneous-frequency adjacent-domain _IDNb ^CellWhether satisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6;$ The reallocation module is used for working as $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6$ The time, be the new PCI of described newly-built cell allocation one.

Wherein, also comprise reminding module, be used to point out the PCI of the newly-built sub-district of OMC can cause the interference of adjacent area reference information.

Memory module is used for when adjacent co-frequency cell is in same eNB, with described N _IDN ^{Cell '}Be kept in this eNB temporarily.

Wherein, described reallocation module comprises: the assignment module is used to described newly-built sub-district to compose a new PCI value N again _IDN ^{Cell '}, $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1,$ And $N_{\mathrm{IDN}}^{\mathrm{cell}}\≠N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\mathrm{mod}6,$ Wherein $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1$ Be cycle calculations, until N _IDN ^{Cell '}All do not satisfy congruence relations with the PCI value of all homogeneous-frequency adjacent-domains.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. the distribution method of a physical district ID (PCI) is characterized in that, comprising: as the PCI of newly-built sub-district value N _IDN ^CellPCI value N with homogeneous-frequency adjacent-domain _IDNb ^CellSatisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6$ The time, then be the new PCI of described newly-built cell allocation one again.

2. method according to claim 1 is characterized in that, described is the new PCI of described newly-built cell allocation one again, is specially: be the PCI value N of the described suggestion in newly-built sub-district _IDN ^{Cell '}

3. method according to claim 2 is characterized in that, the described PCI value N that gives the suggestion in newly-built sub-district _IDN ^{Cell '}, be specially:

$N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1,$ And $N_{\mathrm{IDN}}^{\mathrm{cell}}\≠N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\mathrm{mod}6,$ Wherein $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1$ Be cycle calculations, until N _IDN ^{Cell '}All do not satisfy congruence relations with the PCI value of all homogeneous-frequency adjacent-domains.

4. method according to claim 3 is characterized in that, when adjacent co-frequency cell is in same eNB, with described N _IDN ^{Cell '}Be kept in this eNB temporarily.

5. method according to claim 2 is characterized in that, for before described newly-built sub-district provides the PCI value of suggestion, if adjacent co-frequency cell is in an eNB time, described eNB points out this PCI of OMC can cause the interference of adjacent area; If adjacent co-frequency cell is not in same eNB the time, opposite end eNB informs that by the order of X2 message source this PCI of end eNB can cause the interference of adjacent area, and prompting OMC.

6. the distributor of a physical district ID (PCI) is characterized in that, comprising: judge module is used to judge the PCI value N of newly-built sub-district _IDN ^CellPCI value N with homogeneous-frequency adjacent-domain _IDNb ^CellWhether satisfy congruence relations $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6;$

The reallocation module is used for working as $N_{\mathrm{IDN}}^{\mathrm{cell}}\≡N_{\mathrm{IDNb}}^{\mathrm{cell}}\mathrm{mod}6$ The time, be the new PCI of described newly-built cell allocation one.

7. device according to claim 6 is characterized in that, also comprises: reminding module is used to point out the PCI of the newly-built sub-district of OMC can cause the interference of adjacent area reference information.

8. device according to claim 6 is characterized in that, described reallocation module comprises: the assignment module is used to described newly-built sub-district to compose a new PCI value N again _IDN ^{Cell '}, $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1,$ And $N_{\mathrm{IDN}}^{\mathrm{cell}}\≠N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}\mathrm{mod}6,$ Wherein $N_{\mathrm{IDN}}^{{\mathrm{cell}}^{\′}}=N_{\mathrm{IDN}}^{\mathrm{cell}}+1$ Be cycle calculations, until N _IDN ^{Cell '}All do not satisfy congruence relations with the PCI value of all homogeneous-frequency adjacent-domains.

9. device according to claim 6 is characterized in that, also comprises: memory module is used for when adjacent co-frequency cell is in same eNB, with described N _IDN ^{Cell '}Be kept in this eNB temporarily.

Images