CN102026168B - Method and equipment for distributing physical cell ID - Google Patents
Method and equipment for distributing physical cell ID Download PDFInfo
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- CN102026168B CN102026168B CN201010612368.5A CN201010612368A CN102026168B CN 102026168 B CN102026168 B CN 102026168B CN 201010612368 A CN201010612368 A CN 201010612368A CN 102026168 B CN102026168 B CN 102026168B
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Abstract
The embodiment of the invention relates to the technical field of wireless communication, in particular to a method and equipment for distributing physical cell ID. The invention is used for solving the problem in the prior art that the scheme identified by the method for planning the physical cell ID can lead to stronger interference between the adjacent physical control format indication channels (PCFICHs). The method provided by the embodiment of the invention comprises the following steps: determining a cell to which the physical cell ID needs to be distributed; and distributing the physical cell ID to the cell according to the starting position of the PCFICH frequency domain of the neighbor cell. In the embodiment of the invention, the physical cell ID is planned according to the evasion principle, thus reducing the interference between the adjacent PCFICHs and further improving the system performance.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of method and apparatus that distributes Physical Cell Identifier.
Background technology
Due to TD-LTE (Time Division Long Term Evolution, synchronous Long Term Evolution of time-division) in system, physical district ID (sign) is bound one by one with mechanism such as resource mapping, code resource distribution and frequency hoppings, so the same TD-SCDMA of the configuration of physical district ID (Time Division Synchronized CodeDivision Multiple Access, TD SDMA) the scrambling code planning effect in system is suitable, seems particularly important in identical networking.
Physical district ID is major decision information, particularly broadcast channel and the control channel that in physical channel, the scrambler initial value generates, and the correlation of physical district ID has determined the correlation of control channel scrambler, plays a part crucial to the interference of channel.
Due to physical district ID and PSC (Primary Synchronization Code, Primary Synchronisation Code)/SSC (Secondary Synchronization Code, secondary synchronization code) sequence index is number one by one corresponding, produce for fear of neighbor cell and disturb, need to reasonably plan 504 physical-layer cell ID.
For the planning of the physical district ID in the TD-LTE system, certain principle is arranged in 3GPP 36.211, be exactly a cell cluster take 30 residential quarters, the physical district ID of 30 residential quarters in cell cluster will be selected in 30 physical district IDs, such as 30 residential quarter physical district IDs in first cell cluster are selected in [0～29], the physical district ID of 30 residential quarters in another cell cluster is selected in [30～59].Aforesaid way is not considered the phase mutual interference of interchannel, for producing stronger interference between adjacent PCFICH (Physical ControlFormat Indication Channel, Physical Control Format Indicator Channel).
In sum, the scheme of planning at present the method sign of Physical Cell Identifier can make the stronger interference of generation between adjacent PCFICH.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus that distributes Physical Cell Identifier, can make the problem of the stronger interference of generation between adjacent PCFICH in order to the scheme of the method sign that solves the planning Physical Cell Identifier that exists in prior art.
A kind of method of distributing Physical Cell Identifier that the embodiment of the present invention provides comprises:
Determine to need to distribute the residential quarter of Physical Cell Identifier;
Be this cell allocation Physical Cell Identifier according to the Physical Control Format Indicator Channel PCFICH frequency domain start position of adjacent cell.
Describedly comprise for this cell allocation Physical Cell Identifier:
Select a Physical Cell Identifier from Physical Cell Identifier to be allocated;
At the 2nd PCFICH frequency domain start position of a PCFICH frequency domain start position of this residential quarter of determining according to the Physical Cell Identifier of selecting and the adjacent cell of determining according to the Physical Cell Identifier of adjacent cell not simultaneously, with the Physical Cell Identifier the selected Physical Cell Identifier as this residential quarter.
When identical, return to the step of selecting a Physical Cell Identifier with the 2nd PCFICH frequency domain start position at a PCFICH frequency domain start position.
Whether CELL_ID mod (2 * descending RB number) value that judgement is selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, if so, determines that a PCFICH frequency domain start position is different from the 2nd PCFICH frequency domain start position; Otherwise, determine that a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
Described also comprising after the Physical Cell Identifier of Physical Cell Identifier as this residential quarter of selecting:
The Physical Cell Identifier that deletion is selected from Physical Cell Identifier to be allocated.
A kind of equipment that distributes Physical Cell Identifier that the embodiment of the present invention provides comprises:
Determination module is used for definite residential quarter that needs to distribute Physical Cell Identifier;
Distribution module, the PCFICH frequency domain start position that is used for according to adjacent cell is this cell allocation Physical Cell Identifier.
Described distribution module specifically is used for:
Select a Physical Cell Identifier from Physical Cell Identifier to be allocated; At the 2nd PCFICH frequency domain start position of a PCFICH frequency domain start position of this residential quarter of determining according to the Physical Cell Identifier of selecting and the adjacent cell of determining according to the Physical Cell Identifier of adjacent cell not simultaneously, with the Physical Cell Identifier the selected Physical Cell Identifier as this residential quarter.
Described distribution module specifically is used for:
At a PCFICH frequency domain start position with the 2nd PCFICH frequency domain start position when identical, again select a Physical Cell Identifier from Physical Cell Identifier to be allocated, check whether a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
Described distribution module specifically is used for:
Whether CELL_ID mod (2 * descending RB number) value that judgement is selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, if so, determines that a PCFICH frequency domain start position is different from the 2nd PCFICH frequency domain start position; Otherwise, determine that a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
Described distribution module also is used for:
After the Physical Cell Identifier of Physical Cell Identifier as this residential quarter of selecting, the Physical Cell Identifier that deletion is selected from Physical Cell Identifier to be allocated.
Because the embodiment of the present invention is carried out Physical Cell Identifier planning according to evading principle, thereby reduced the interference between adjacent PCFICH; Further improved systematic function.
Description of drawings
Fig. 1 is the method flow schematic diagram that the embodiment of the present invention is distributed Physical Cell Identifier;
Fig. 2 is that the embodiment of the present invention is distributed the method flow schematic diagram of Physical Cell Identifier according to distribution principle;
Fig. 3 is the device structure schematic diagram that the embodiment of the present invention is distributed Physical Cell Identifier.
Embodiment
The embodiment of the present invention is the cell allocation Physical Cell Identifier according to the PCFICH frequency domain start position of adjacent cell.Owing to carrying out Physical Cell Identifier planning according to evading principle, thereby reduced the interference between adjacent PCFICH.
Wherein, the scheme of the embodiment of the present invention can be applied in the LTE system, also can be applied in the system that contains PCFICH.
Physical-layer cell identifier in the LTE system
Wherein, physical layer ID group sign
Scope is 0～167, physical layer ID sign in group
Scope is 0～2.
With
Represent respectively the sequence index number of SSC and PSC.
The inventor finds that the initial subcarrier number that PCFICH takies is
Wherein
The number of the subcarrier that comprises of a RB,
The RB sum that downlink bandwidth comprises,,
Physical-layer cell ID.Because PCFICH is mapped to first OFDM (Orthogonal Frequency Division Multiplexing, OFDM) 4 of symbol REG (Resource Elements Group, resource unit group) on, and 4 REG equidistantly are distributed in the whole system bandwidth, so during networking, different districts should have different side-play amount (relevant with physical district ID), to reduce the interference between different districts PCFICH.
Suppose under the 20M band width configuration, the frequency domain start position that descending RB (resource block, Resource Block) adds up to 100, PCFICH is:
Due in first symbol, only there is at most the CRS (cell special reference of two ports, Cell-specific reference signals), the REG size of each PCFICH is 4 RE (ResourceElements, Resource Unit), suppose that in the situation that continuously grouping (continuous 3 residential quarters are a multiplexing cluster), the start position of the PCFICH of three residential quarters differs 6 RE, has satisfied the requirement of PCFICH frequency domain dislocation.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As shown in Figure 1, the embodiment of the present invention distributes the method for Physical Cell Identifier to comprise the following steps:
In step 102, select a Physical Cell Identifier from Physical Cell Identifier to be allocated; Then at the PCFICH frequency domain start position of this residential quarter of determining according to the Physical Cell Identifier of a selecting (i.e. PCFICH frequency domain start position, lower with) with the PCFICH frequency domain start position of the adjacent cell of determining according to the Physical Cell Identifier of adjacent cell (i.e. the 2nd PCFICH frequency domain start position, lower with) not simultaneously, with the Physical Cell Identifier the selected Physical Cell Identifier as this residential quarter.
At a PCFICH frequency domain start position with the 2nd PCFICH frequency domain start position when identical, again select a Physical Cell Identifier from Physical Cell Identifier to be allocated, and it is not continue to judge according to the new Physical Cell Identifier of selecting whether a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position, until identical with the 2nd PCFICH frequency domain start position according to Physical Cell Identifier judgement the one PCFICH frequency domain start position of selecting.
Need to prove, the embodiment of the present invention is not limited to and judges whether identical mode of a PCFICH frequency domain start position and the 2nd PCFICH frequency domain start position, and other can be that the mode of this cell allocation Physical Cell Identifier all is suitable for the embodiment of the present invention according to the PCFICH frequency domain start position of adjacent cell.
Wherein, when judging that a PCFICH frequency domain start position and the 2nd PCFICH frequency domain start position be whether identical, can whether unequal definite with CELL_ID mod (2 * descending RB number) value of adjacent cell by CELL_ID mod (2 * descending RB (Resource Block, the Resource Block) number) value that judgement is selected.
Concrete, whether CELL_ID mod (2 * descending RB number) value that judgement is selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, if so, determine that a PCFICH frequency domain start position is different from the 2nd PCFICH frequency domain start position; Otherwise, determine that a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
Residential quarter A and residential quarter B adjacent area each other for example, descending RB number is 100, if the ID of residential quarter A is set to 1, the ID of residential quarter B can not be made as 200 * n+1, wherein n is the integer between 0～2.
Specifically can be referring to table 1:
Table 1
Need to prove, the embodiment of the present invention is not limited to and adopts CELL_ID mod (2 * descending RB number) value to judge whether identical mode of a PCFICH frequency domain start position and the 2nd PCFICH frequency domain start position, and other can judge whether identical mode all is suitable for the embodiment of the present invention for a PCFICH frequency domain start position and the 2nd PCFICH frequency domain start position.
Better, will can also delete the Physical Cell Identifier of selecting after the Physical Cell Identifier of Physical Cell Identifier as this residential quarter of selecting from Physical Cell Identifier to be allocated, avoid follow-up the repetition to select.
As shown in Figure 2, the embodiment of the present invention distributes the method for Physical Cell Identifier to comprise the following steps: according to distribution principle
Whether CELL_ID mod (2 * descending RB number) value that step 205, judgement are selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, and if so, execution in step 206; Otherwise, execution in step 208.
Wherein, after returning to step 204, again select from Physical Cell Identifier to be allocated in step 204 one with the different Physical Cell Identifier of selection before.
Based on same inventive concept, a kind of equipment that distributes Physical Cell Identifier also is provided in the embodiment of the present invention, because the principle that this equipment is dealt with problems is similar to the method for distributing Physical Cell Identifier, so the enforcement of this equipment can referring to the enforcement of method, repeat part and repeat no more.
As shown in Figure 3, the embodiment of the present invention distributes the equipment of Physical Cell Identifier to comprise: determination module 10 and distribution module 20.
Determination module 10 is used for definite residential quarter that needs to distribute Physical Cell Identifier;
Distribution module 20, the PCFICH frequency domain start position that is used for according to adjacent cell is this cell allocation Physical Cell Identifier.
Wherein, distribution module 20 is selected a Physical Cell Identifier from Physical Cell Identifier to be allocated;
Distribution module 20 at the 2nd PCFICH frequency domain start position of a PCFICH frequency domain start position of this residential quarter of determining according to the Physical Cell Identifier of selecting and the adjacent cell of determining according to the Physical Cell Identifier of adjacent cell not simultaneously, with the Physical Cell Identifier the selected Physical Cell Identifier as this residential quarter;
Distribution module 20 at a PCFICH frequency domain start position with the 2nd PCFICH frequency domain start position when identical, again select a Physical Cell Identifier from Physical Cell Identifier to be allocated, check whether a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
In force, whether CELL_ID mod (2 * descending RB number) value that distribution module 20 judgements are selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, if so, determine that a PCFICH frequency domain start position is different from the 2nd PCFICH frequency domain start position; Otherwise, determine that a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
Better, distribution module 20 can also be with after the Physical Cell Identifier of Physical Cell Identifier as this residential quarter of selecting, the Physical Cell Identifier that deletion is selected from Physical Cell Identifier to be allocated.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect fully.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the present invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of realizing in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby be provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction of carrying out on computer or other programmable devices.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Because the embodiment of the present invention is carried out Physical Cell Identifier planning according to evading principle, thereby reduced the interference between adjacent PCFICH; Further improved systematic function.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. a method of distributing Physical Cell Identifier, is characterized in that, the method comprises:
Determine to need to distribute the residential quarter of Physical Cell Identifier;
Be this cell allocation Physical Cell Identifier according to the Physical Control Format Indicator Channel PCFICH frequency domain start position of adjacent cell;
Describedly comprise for this cell allocation Physical Cell Identifier:
Select a Physical Cell Identifier from Physical Cell Identifier to be allocated;
At the 2nd PCFICH frequency domain start position of a PCFICH frequency domain start position of this residential quarter of determining according to the Physical Cell Identifier of selecting and the adjacent cell of determining according to the Physical Cell Identifier of adjacent cell not simultaneously, with the Physical Cell Identifier the selected Physical Cell Identifier as this residential quarter.
2. the method for claim 1, is characterized in that, when identical, returns to the step of selecting a Physical Cell Identifier with the 2nd PCFICH frequency domain start position at a PCFICH frequency domain start position.
3. method as claimed in claim 1 or 2, it is characterized in that, whether CELL_ID mod (2 * descending RB number) value that judgement is selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, if so, determine that a PCFICH frequency domain start position is different from the 2nd PCFICH frequency domain start position; Otherwise, determine that a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
4. the method for claim 1, is characterized in that, described also comprising after the Physical Cell Identifier of Physical Cell Identifier as this residential quarter of selecting:
The Physical Cell Identifier that deletion is selected from Physical Cell Identifier to be allocated.
5. an equipment that distributes Physical Cell Identifier, is characterized in that, this equipment comprises:
Determination module is used for definite residential quarter that needs to distribute Physical Cell Identifier;
Distribution module, the PCFICH frequency domain start position that is used for according to adjacent cell is this cell allocation Physical Cell Identifier;
Select a Physical Cell Identifier from Physical Cell Identifier to be allocated; At the 2nd PCFICH frequency domain start position of a PCFICH frequency domain start position of this residential quarter of determining according to the Physical Cell Identifier of selecting and the adjacent cell of determining according to the Physical Cell Identifier of adjacent cell not simultaneously, with the Physical Cell Identifier the selected Physical Cell Identifier as this residential quarter.
6. equipment as claimed in claim 5, is characterized in that, described distribution module specifically is used for:
At a PCFICH frequency domain start position with the 2nd PCFICH frequency domain start position when identical, again select a Physical Cell Identifier from Physical Cell Identifier to be allocated, check whether a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
7. equipment as described in claim 5 or 6, is characterized in that, described distribution module specifically is used for:
Whether CELL_ID mod (2 * descending RB number) value that judgement is selected is unequal with CELL_ID mod (2 * descending RB number) value of adjacent cell, if so, determines that a PCFICH frequency domain start position is different from the 2nd PCFICH frequency domain start position; Otherwise, determine that a PCFICH frequency domain start position is identical with the 2nd PCFICH frequency domain start position.
8. equipment as claimed in claim 5, is characterized in that, described distribution module also is used for:
After the Physical Cell Identifier of Physical Cell Identifier as this residential quarter of selecting, the Physical Cell Identifier that deletion is selected from Physical Cell Identifier to be allocated.
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| CN103326807B (en) * | 2012-03-21 | 2016-08-24 | 普天信息技术研究院有限公司 | A kind of system information sending method and evolved base station |
| CN103369536B (en) * | 2012-03-30 | 2018-04-27 | 中兴通讯股份有限公司 | A kind of method and device that cell ID is distributed in long evolving system |
| CN103747445B (en) * | 2014-01-27 | 2017-10-03 | 上海大唐移动通信设备有限公司 | A kind of method and apparatus for distributing Physical Cell Identifier |
| CN111200818B (en) * | 2018-11-19 | 2022-10-21 | 中国电信股份有限公司 | Interference avoidance method and device |
| CN113645611B (en) * | 2021-10-18 | 2022-02-08 | 中通服建设有限公司 | Ternary constrained 5G PCI planning method and device and storage medium |
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| CN101115269A (en) * | 2006-07-24 | 2008-01-30 | 上海原动力通信科技有限公司 | Method, device and application for identifying cell identifier ID number |
| CN101183920A (en) * | 2007-12-17 | 2008-05-21 | 中兴通讯股份有限公司 | Method and apparatus for mapping PHICH to physical subcarrier |
| CN101212416A (en) * | 2007-12-25 | 2008-07-02 | 中兴通讯股份有限公司 | Physical channel mapping method |
| CN101568196A (en) * | 2008-09-26 | 2009-10-28 | 华为技术有限公司 | Method and device for distributing physical cell identifiers |
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| WO2009120137A1 (en) * | 2008-03-25 | 2009-10-01 | Telefonaktiebolaget L M Ericsson (Publ) | Method for automatically selecting a physical cell identity (pci) of a long term evolution (lte) radio. cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115269A (en) * | 2006-07-24 | 2008-01-30 | 上海原动力通信科技有限公司 | Method, device and application for identifying cell identifier ID number |
| CN101183920A (en) * | 2007-12-17 | 2008-05-21 | 中兴通讯股份有限公司 | Method and apparatus for mapping PHICH to physical subcarrier |
| CN101212416A (en) * | 2007-12-25 | 2008-07-02 | 中兴通讯股份有限公司 | Physical channel mapping method |
| CN101568196A (en) * | 2008-09-26 | 2009-10-28 | 华为技术有限公司 | Method and device for distributing physical cell identifiers |
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