CN1913695A - Method for reducing co-channel interference in sector interval - Google Patents
Method for reducing co-channel interference in sector interval Download PDFInfo
- Publication number
- CN1913695A CN1913695A CNA200510089994XA CN200510089994A CN1913695A CN 1913695 A CN1913695 A CN 1913695A CN A200510089994X A CNA200510089994X A CN A200510089994XA CN 200510089994 A CN200510089994 A CN 200510089994A CN 1913695 A CN1913695 A CN 1913695A
- Authority
- CN
- China
- Prior art keywords
- downlink frequency
- frequency pilot
- pilot code
- scrambler
- code
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a method for decreasing the frequency interference of sectors, including: compositing the scrambling codes of the repeated codes which are likely to happen in the complex codes to form a number of base-scrambling code groups, and obtaining the corresponding relationships between the base-scrambling code groups and the downlink pilot-codes according to the splitting situation of the groups; distributing different base scrambling codes to the adjacent base stations; distributing a downlink pilot-code for each area which is different from the ones of the adjacent area according to the corresponding relationships between the base-scrambling code groups and the downlink pilot-codes; determining the scrambling code of this area based on the corresponding relationships between the distributed downlink pilot-codes and the base-scrambling code groups.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to a kind of method that reduces co-channel interference between the sector.
Background technology
An important means that improves power system capacity and spectrum efficiency in the cell mobile communication systems is to adopt the cell structure of sectorization, not only can improve the availability of frequency spectrum of system by the sectorization of sub-district, and reduced demand, thereby become one of main economic networking mode to the site, base station.In TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system,, support sectorized cells also to remain a kind of means of requisite raising power system capacity although adopted key technologies such as smart antenna, joint-detection to increase substantially power system capacity.
In the cell mobile communication systems of sectorization, the loss that the increase that can cause the sector intersection to disturb owing to the imperfection of radiation pattern brings capacity, this feature is present in the TD-SCDMA system that has adopted smart antenna equally, in the edge, sector, the wave beam forming ability drop of smart antenna, show as not only figuration gain relative sector middle part and descend to some extent but also the beamwidth broad, thereby adjacent sectors is caused bigger interference.
In the TD-SCDMA system, what subscriber signal adopted in the distinguishing cell is OVSF (Orthogonal Variable Spreading Factor OVSF) sign indicating number, i.e. channel code, and adopt different scramblers to distinguish between the sub-district.Although under desirable channel condition, be quadrature between the user in the same sub-district, because the effect of scrambler but might not be quadrature between the user of different districts.In fact user in the TD-SCDMA network of many sub-districts is equivalent to the compound key that adopts channel code and scrambler to obtain after multiplying each other and distinguishes.In the TD-SCDMA system, the scrambler that adopt each sub-district determines by the network planning, and the employed channel code of each user distributes during then by network implementation.Because the maximum spreading factor that is adopted in the TD-SCDMA system only is 16 chips, and the scrambler that defines in the standard also has only 128, be divided into 32 groups of uses, the length of each scrambler also is 16 chips, and therefore this short code has increased the possibility that occurs the compound key coincidence between the different districts user.In case the user who has compound key to overlap between different districts, and satisfy and when the signal of base station propagation delay time is close, very strong mutual interference will occur.
Chinese patent application 200410048702.3 has disclosed a kind of " the scrambler differentiating method of time-division-synchronization code multi-address division system and code word division methods ", this method is at correlation between the TD-SCDMA system scrambler, 128 scramblers of system are divided into 12 basic scrambler groups, the identical probability of compound key occur with this user who reduces information-based sign indicating number that terminal in the same time slot in edge, sector distributed and edge, adjacent sector.Chinese patent application 200410048703.8 also discloses " a kind of cell scrambling distribution method of time-division-synchronization code multi-address division system ", scene at omni cell, proposed to avoid between neighbor cell, occurring the scrambling code distribution method that compound key overlaps, to reduce the interference between omni cell in the TD-SCDMA system.
Although the TD-SCDMA system can adopt above these technology to reduce intrasystem interference, improve systematic function, yet under some special situations, these technology can not obtain effect preferably.
For example, in the scene as shown in Figure 1, base station A adopts smart antenna to cover 3 sectors, these 3 sectors logically are respectively sub-district A, sub-district B and sub-district C, suppose that 3 sectors are operated in same frequency, portable terminal A establishes a communications link with the base station in the A of sub-district, and portable terminal B establishes a communications link with the base station in the C of sub-district.Under this scene, because terminal A and terminal B compare near the area, edge between sub-district A and the sub-district C, intelligent antenna figuration wave beam separately is all than broad, when terminal A is identical with terminal B working time slot, just formed stronger wave beam and covered overlapping interference each other, and the general associated detection technique that is only applicable to eliminate inter-user interference in the sub-district that adopts also can't be eliminated the interference of this minizone.Can not deal with problems by existing scrambling code planning technology, we analyze the front, because the effect of scrambler, user's actual spreading code no longer can guarantee to have orthogonality completely between the TD-SCDMA system cell, when the spreading code of terminal A and terminal B had certain correlation, the signal of two terminal rooms will form interference to a certain degree.Particularly when terminal A apart from the far away and terminal B of base station A apart from base station A when nearer, on down direction, because stronger power need be launched to overcome the influence of transmission path loss to terminal A in the base station, at this moment the base station that receives of terminal B also has stronger power for the signal of terminal A, the useful signal that be transmitted to terminal B this moment might be submerged in the signal that is transmitted to terminal A, even the correlation between two user's spreading codes also can be brought very big interference when not being very strong and cause correctly received signal of terminal B.
Summary of the invention
The purpose of this invention is to provide a kind of method that reduces co-channel interference between the sector, to overcome the shortcoming that in particular cases still has larger interference in the prior art at some between adjacent sectors, further disturb in the reduction system, improve the overall performance of TD-SCDMA system.
For this reason, the invention provides following technical scheme:
A kind of method that reduces co-channel interference between the sector, described method comprises step:
A, the scrambler that repeated code may be appearred in compound key are formed a plurality of basic scrambler groups, and are obtained the corresponding relation of basic scrambler group and downlink frequency pilot code according to the grouping situation of basic scrambler group;
B, be the adjacent different basic scrambler group of base station assigns;
C, according to the corresponding relation of basic scrambler group and downlink frequency pilot code, be downlink frequency pilot code different of each cell allocation with the neighbor cell downlink frequency pilot code;
D, according to the downlink frequency pilot code of cell allocation and with the corresponding relation of basic scrambler group, determine the scrambler of this sub-district.
Described steps A comprises:
The compound key that all scramblers and orthogonal variable spreading factor sign indicating number OVSF are combined carries out correlation calculations in twos, and the scrambler that compound key may be overlapped is divided into one group, and being divided into is 12 groups of base scrambler groups;
According to the block number at each scrambler place and the corresponding relation of downlink frequency pilot code in the basic scrambler group, set up the corresponding relation of basic scrambler group and downlink frequency pilot code.
Described step B comprises:
B1, need to determine the base station of allocation base scrambler group and the basic scrambler group that this base station can be distributed successively;
B2, the basic scrambler group of using according to all adjacent base stations of this base station be base station selected available basic scrambler group in the described basic scrambler group that can distribute.
Described step B2 comprises:
B21, in the described basic scrambler group that can distribute, be base station selected basic scrambler group by basic scrambler set of dispense predefined procedure;
Whether B22, the basic scrambler group of determine selecting in the following manner be available:
Check in all adjacent base stations of this base station the basic scrambler group whether described selection is used in existing base station successively; If should base scrambler group be used, should base scrambler group be unavailable then; Otherwise should base scrambler group be available;
If B23 is available, the basic scrambler group of selecting for this base station assigns and upgrade allocation result then;
If still have available basic scrambler group in the basic scrambler group that B24 is unavailable and described energy distributes, then select next basic scrambler group by described predefined procedure, return step B22 then.
Preferably, described basic scrambler set of dispense predefined procedure is putting in order of basic scrambler group.
Described step C comprises:
C1, need to determine the sub-district of allocation of downlink pilot code successively;
C2, determine the downlink frequency pilot code that this sub-district can be distributed;
C3, the downlink frequency pilot code of using according to all neighbor cells of this sub-district be available downlink frequency pilot code of this cell selecting in the described downlink frequency pilot code that can distribute.
Described step C2 comprises:
C21, the basic scrambler group of having distributed according to this cell base station and the corresponding relation of downlink frequency pilot code obtain all downlink frequency pilot code of this base scrambler group correspondence;
The downlink frequency pilot code that C22, the downlink frequency pilot code of not used by neighbor cell in should all downlink frequency pilot code of base scrambler group correspondence can be distributed as described this sub-district.
Described step C3 comprises:
C31, to distribute predefined procedure by descending pilot code be downlink frequency pilot code of this cell selecting in the described downlink frequency pilot code that can distribute;
Whether C32, the downlink frequency pilot code of determine selecting in the following manner be available:
Check in all neighbor cells of this sub-district the downlink frequency pilot code whether described selection is used in existing sub-district successively; If this downlink frequency pilot code is used, then this downlink frequency pilot code is unavailable; Otherwise this downlink frequency pilot code is available;
If C33 is available, the downlink frequency pilot code of selecting for this cell allocation and upgrade allocation result then;
If still have available downlink frequency pilot code in the downlink frequency pilot code that C34 is unavailable and described energy distributes, then select next downlink frequency pilot code by described predefined procedure, return step C32 then.
Preferably, described downlink frequency pilot code distribution predefined procedure is putting in order of downlink frequency pilot code.
Described step D comprises:
D1, according to the downlink frequency pilot code of cell allocation and with the corresponding relation of basic scrambler group, which basic scrambler group each scrambler that obtains in the code character of this downlink frequency pilot code correspondence belongs to respectively;
All scramblers that D2, the basic scrambler group of selecting this cell allocation and downlink frequency pilot code are all corresponding;
D3, from the scrambler of selecting, select a scrambler different, be defined as the scrambler of this sub-district with the scrambler of neighbor cell.
Described sub-district comprises: sectorized cells and/or omni cell.
Preferably, described method also comprises step:
E, when having the situation that compound key overlaps with adjacent sector terminal, one of terminal of phase mutual interference is adjusted to other time slots with time slot when accessing terminal.
Described step e comprises:
Whether there is adjacent sector terminal in the preset range that E1, real-time detection are the center to access terminal with time slot;
E2, when having described adjacent sector terminal with time slot, check the situation whether described channel code that accesses terminal exists compound key to overlap with the channel code of described adjacent sector terminal according to the channel code of adjacent sector scrambler, this cell scrambling and adjacent sector terminal;
If the situation that E3 exists compound key to overlap then adopts dynamic channel allocating technology in order that one of terminal of phase mutual interference is adjusted to other time slots.
By above technical scheme provided by the invention as can be seen, the present invention is according to the scrambler characteristic of TD-SCDMA system, and the scrambler that repeated code compound key may be occurred is formed basic scrambler group respectively.When distributing scrambler for each sub-district (sub-district that comprises omni cell and sectorization), be the adjacent different basic scrambler group of base station assigns earlier, corresponding relation according to basic scrambler group and downlink frequency pilot code is each cell allocation downlink frequency pilot code again, further determines the scrambler of each sub-district then.Like this, the scrambler that has guaranteed each sub-district under the same base station belongs to same basic scrambler, and guaranteed to belong to the scrambler that is distributed between the sub-district of different base station and belonged to different basic scrambler groups, avoided belonging between the neighbor cell of different base station and strong jamming occurs.
Because the downstream signal of TD-SCDMA system base-station emission all is a strict synchronism, and the upward signal of terminal emission also to make its main footpath of inhibit signal when arriving the base station by uplink synchronous control be synchronous, therefore method provided by the invention can make the very near complete quadrature of user's spreading code of distance that belongs to different sectors respectively, so just can eliminate the phase mutual interference between these users basically.
When terminal makes and terminal spreading code with adjacent sectors occurs in the edge, sector when relevant fully because of moving, can also one of them terminal be adjusted to other different time-gaps or carrier frequency by the dynamic channel allocating technology in order in the system equipment, thereby can avoid interference effectively and the call drop phenomenon that causes.And, so just improved the performance of system on the whole because each channel code is only relevant fully with one of 16 channel codes in adjacent sector, and therefore, the signaling recruitment that causes owing to dynamic channel allocation can be very not big yet.
Description of drawings
Fig. 1 is the inter-sector interference schematic diagram;
Fig. 2 is the realization flow figure of the inventive method;
Fig. 3 is the allocation flow figure of basic scrambler group in the inventive method;
Fig. 4 is the allocation flow figure of downlink frequency pilot code in the inventive method;
Fig. 5 is that terminal initial guarantees when inserting not the identical flow chart of compound key to occur with the user at edge, adjacent sector.
Embodiment
Core of the present invention is the scrambler characteristic according to the TD-SCDMA system, and the scrambler that repeated code compound key may be occurred is formed basic scrambler group respectively.When distributing scrambler for each sub-district (sub-district that comprises omni cell and sectorization), be the adjacent different basic scrambler group of base station assigns earlier, guarantee that the scrambler of each sub-district under the same base station belongs to same basic scrambler; Corresponding relation according to basic scrambler group and downlink frequency pilot code is each cell allocation downlink frequency pilot code again, further determines the scrambler of each sub-district then, guarantees that belonging to the scrambler that is distributed between the sub-district of different base station belongs to different basic scrambler groups.When terminal initial inserts and in the mobile communication process behind the terminal connecting system, detection is the adjacent sector terminal that whether exists in the certain limit at center with time slot with this terminal, and the channel code of checking this terminal according to the channel code of adjacent sector scrambler, this cell scrambling and adjacent sector terminal whether can with situation that should exist compound key to overlap with the time slot terminal of adjacent sector, if the situation that exists compound key to overlap, one of terminal that then adopts the mutual interference of dynamic channel allocating technology in order friendship phase is adjusted to other time slots, to avoid strong jamming occurring at the edge, sector.
The present technique field personnel know, the employed sign indicating number of TD-SCDMA system can be divided into by type: downlink frequency pilot code, ascending pilot frequency sign indicating number, cell scrambling, training sequence (midamble) sign indicating number.The corresponding relation of downlink frequency pilot code, ascending pilot frequency sign indicating number, scrambler and basic midamble intersymbol is as shown in table 1 below.
Table 1:
| Downlink frequency pilot code/scrambler code character numbering | Relevant code word | |||
| Downlink frequency pilot code sequence number (SYNC_DL ID) | Ascending pilot frequency sign indicating number sequence number (SYNC_UL ID) | Scrambler sequence number (Scrambling Code ID) | Basic training sequences sign indicating number sequence number (Basic Midamble Code ID) | |
| 1 | 0 | 0～7 (000～111) | 0 | 0 |
| 1 | 1 | |||
| 2 | 2 | |||
| 3 | 3 | |||
| 2 | 1 | 8～15 (000～111) | 4 | 4 |
| 5 | 5 | |||
| 6 | 6 | |||
| 7 | 7 | |||
| ... | ||||
| 32 | 31 | 248～255 (000～111) | 124 | 124 |
| 125 | 125 | |||
| 126 | 126 | |||
| 127 | 127 | |||
Wherein, downlink frequency pilot code one has 32, is used for the down-going synchronous and the Cell searching of TD-SCDMA system; Ascending pilot frequency sign indicating number one has 256, is used for the uplink synchronous of TD-SCDMA system and access at random; Scrambler has 128, and each scrambler is respectively applied for data symbol sequence and multiplies each other, and makes data symbol sequence present more pseudorandom permutation characteristic, thereby can be used for sign and distinguish neighbor cell; The quantity of basic midamble sign indicating number also is 128, is used to estimate channel response.In actual applications, the ascending pilot frequency sign indicating number is used in random access procedure by subscriber equipment, the employed downlink frequency pilot code of the ascending pilot frequency sign indicating number of each sub-district and sub-district has certain corresponding relation, corresponding 8 the ascending pilot frequency sign indicating numbers of downlink frequency pilot code, each sub-district is after downlink frequency pilot code is determined, can from 4 scramblers of each downlink frequency pilot code correspondence, select a scrambler as this sub-district, so also just determined simultaneously corresponding basic midamble sign indicating number, the midamble sign indicating number of different channels is to be produced according to certain skew by basic midamble sign indicating number in the sub-district.Also comprise long (OVSF) spreading code of orthogonal variable at the employed sign indicating number of TD-SCDMA system, this OVSF spreading code is used for distinguishing the different channel of same signal source, and the compound resulting complex data sequence in back that multiplies each other of OVSF spreading code and scrambler is called compound key.
In order to solve the interference problem that the compound key correlation is brought in the prior art, Chinese patent application 200410048702.3 is considered the relativity problem between the compound key that scrambler and spreading code be composited, and 128 scramblers of TD-SCDMA system are divided into 12 groups shown in the table 2.
Table 2:
| Grouping | The scrambler sequence number | |||||||||||||||
| A | 1 | 5 | 26 | 27 | 29 | 30 | 34 | 40 | 42 | 43 | 49 | 53 | 55 | 57 | 85 | 90 |
| B | 2 | 6 | 8 | 11 | 16 | 21 | 41 | 47 | 48 | 50 | 62 | 65 | 76 | 83 | 119 | 127 |
| C | 3 | 4 | 7 | 12 | 13 | 18 | 23 | 24 | 35 | 36 | 37 | 39 | 46 | 51 | 66 | 87 |
| D | 9 | 10 | 14 | 15 | 19 | 20 | 25 | 28 | 33 | 38 | 45 | 68 | 71 | 105 | 117 | 118 |
| E | 17 | 22 | 31 | 32 | 44 | 60 | 79 | 86 | 93 | 95 | 100 | 106 | 108 | 110 | 125 | 126 |
| F | 52 | 59 | 103 | 128 | - | - | - | - | - | - | - | - | - | - | - | - |
| G | 54 | 81 | 92 | 101 | 121 | - | - | - | - | - | - | - | - | - | - | - |
| H | 56 | 61 | 72 | 84 | 88 | 113 | 116 | - | - | - | - | - | - | - | - | - |
| I | 58 | 78 | 82 | 89 | 97 | 98 | 102 | - | - | - | - | - | - | - | - | - |
| J | 63 | 69 | 70 | 77 | 109 | 123 | - | - | - | - | - | - | - | - | - | - |
| K | 64 | 67 | 73 | 80 | 94 | 96 | 107 | 111 | 114 | 124 | - | - | - | - | - | - |
| L | 74 | 75 | 91 | 99 | 104 | 112 | 115 | 120 | 122 | - | - | - | - | - | - | - |
Wherein, the scrambler group of each the row representative in the table 2 is a basic scrambler group, and according to the definition of the scrambler in the present related standards, the TD-SCDMA system has 12 basic scrambler groups.In the same grouping, any two scramblers and spreading factor are to have situation about overlapping fully between the compound key that forms of 16 channel code, be that coefficient correlation is 1, but each channel code only with 16 formed compound keys of channel code of another scrambler in one relevant fully, remaining then complete quadrature (uncorrelated), as shown in table 3 below.
Table 3:
| Channel code | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
| 9 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 10 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 11 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 12 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 13 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 14 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 15 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 16 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Between the compound key that any two scramblers between any two groups of scramblers and channel code form, the situation that two compound keys overlap fully can not appear, the value of coefficient correlation is respectively 0.5 or 0.25, when coefficient correlation is 0.5,4 coefficient correlations in 16 formed compound keys of channel code of each channel code and another scrambler equal this value, remaining is then relevant fully, when coefficient correlation was 0.25, the coefficient correlation of all 16 formed compound keys of channel code of each channel code and another scrambler all equaled this value.
The present invention promptly solves in the prior art problem of inter-sector interference under the special screne according to the above-mentioned characteristic of the scrambler of TD-SCDMA system.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 2, Fig. 2 shows the realization flow of the inventive method, may further comprise the steps:
Step 201: the scrambler that repeated code compound key may be occurred is formed a plurality of basic scrambler groups, and obtains the corresponding relation of basic scrambler group and downlink frequency pilot code according to the grouping situation of basic scrambler group.
As previously described, the scrambler of TD-SCDMA system is 128, makes up by the spreading code with 16 SF=16, can obtain 2048 compound keys altogether.Distribute to adjacent sub-district for fear of the scrambler that compound key may be occurred overlapping, thereby co-channel interference between the reduction neighbor cell, the compound key that all scramblers and orthogonal variable spreading factor sign indicating number OVSF are combined carries out correlation calculations in twos, the scrambler that compound key may be overlapped is divided into one group, be about to 128 scramblers and be divided into totally 12 groups of the A-L shown in the table 2, each group is called a basic scrambler group.
The present technique field personnel know, in the omni cell structure, and corresponding sub-district of base station equipment, and in the cell structure of sectorization, base station equipment can corresponding several sub-districts, and the coverage of each sub-district is to be a sector at center with this base station.Therefore, at each base station, the scrambler that divides timing should guarantee each sectorized cells under the same base station at scrambler belongs to same basic scrambler group, and the scrambler that the minizone of different base station is distributed belongs to different basic scrambler groups, and situation about overlapping does not appear in the compound key that just can guarantee the neighbor cell scrambler.
After having determined basic scrambler group, just can further determine the corresponding relation of basic scrambler group and downlink frequency pilot code according to the block number at each scrambler place and the corresponding relation of downlink frequency pilot code in the basic scrambler group.According to table 1, the corresponding downlink frequency pilot code of code character, corresponding 4 scramblers of code character.For table 2, each the scrambler sequence number in each row is substituted with its corresponding code character numbering, obtain table 4.Table 4 shows the distribution situation of basic scrambler group membership in code character.
Table 4:
| Base scrambler group | The code character numbering |
| A | 1 2 7 8 9 11 13 14 15 22 23 |
| B | 1 2 3 4 6 11 12 13 16 17 19 21 30 32 |
| C | 1 2 3 4 5 6 9 10 12 13 17 22 |
| D | 3 4 5 7 9 10 12 17 18 27 30 |
| E | 5 6 8 11 15 20 22 24 25 27 28 32 |
| F | 13 15 26 32 |
| G | 14 21 23 26 31 |
| H | 14 16 18 21 22 29 |
| I | 15 20 21 23 25 26 |
| J | 16 18 20 28 31 |
| K | 16 17 19 20 24 27 28 29 31 |
| L | 19 23 25 26 28 29 30 31 |
Step 202: be the different basic scrambler group of adjacent base station assigns.
For desirable cell structure, no matter be omni cell or 3 sector cells, 12 basic scrambler groups can guarantee that fully all sub-districts of each base station and minizone under six base stations of the 1st layer on every side compound key do not occur and overlap.
The position of in the real network because base station can not be that desirable honeycomb distributes, and the network configuration that also has macrocellular and microcellulor to overlap, therefore adjacent base station information produces according to coverage prediction, the adjacent number of base stations of each Serving cell all is different like this, difference according to the employing assessment level, the number of adjacent base station also can change, but can be by setting the main adjacent base station number that to investigate as 6 or other quantity, the adjacent base station number that each Serving cell should be investigated is different respectively, but, just can carry out the planning of basic scrambler group so long as be lower than 11.For example, for Fig. 2, can give base station 1 allocation base scrambler group A, adjacent base station 2-7 can select from basic scrambler group B-L around the base station 1, does not distribute same basic scrambler group as long as guarantee adjacent base station.
Step 203:, be downlink frequency pilot code different of each cell allocation with the neighbor cell downlink frequency pilot code according to the corresponding relation of basic scrambler group and downlink frequency pilot code.
After base station assigns base scrambler group, the basic scrambler group of this base station corresponding district also just determined, then the downlink frequency pilot code of sub-district each code character that just can only provide on the right of the corresponding line in the mapping table of the basic scrambler group shown in the table 4 and downlink frequency pilot code is numbered in the corresponding downlink frequency pilot code and selected.It should be noted that the different districts that belongs to same base station also needs to adopt different downlink frequency pilot code to distinguish.
The distribution of downlink frequency pilot code can be adopted the multiplexing criterion different with basic scrambler group.When in the network planning of reality, carrying out scrambling code planning, because the different cause of neighbor cell number, also can be set to topmost several neighbor cells at the neighbor cell of investigating required investigation when determining downlink frequency pilot code so, as 18 or other quantity, the neighbor cell quantity that each Serving cell should be investigated is different respectively, but so long as be lower than 31, just can carry out the planning of downlink frequency pilot code, can make full use of 32 downlink frequency pilot code like this and cover.
For example, it is A that a certain base station first has been selected basic scrambler group, suppose that there are 3 sector cells same base station, then these 3 sector cells must be selected different code character among the basic scrambler group A, as 1 in the table 4,2,7 these 3 code characters, if any another adjacent base station second, then this adjacent base station second can be selected basic scrambler group B, but 1,2 two corresponding among basic scrambler group B code character just can not have been selected in the sub-district in the second of base station when selecting downlink frequency pilot code, because these two downlink frequency pilot code have been distributed to the sub-district in the first of base station.
Step 204: according to the downlink frequency pilot code of cell allocation and with the corresponding relation of basic scrambler group, determine the scrambler of this sub-district.
Can determine ascending pilot frequency sign indicating number and corresponding basic midamble sign indicating number by the relation between the employed code type of TD-SCDMA system, and further produce the midamble sign indicating number according to basic midamble sign indicating number.Scrambler then can be determined by the code character of downlink frequency pilot code correspondence and the basic scrambler group of sub-district.Concrete method is: earlier according to the downlink frequency pilot code of cell allocation and with the corresponding relation of basic scrambler group, which basic scrambler group each scrambler that obtains in the code character of this downlink frequency pilot code correspondence belongs to respectively, selects basic scrambler group and all corresponding scramblers of downlink frequency pilot code of cell allocation then; From these scramblers, select a scrambler different, be defined as the scrambler of this sub-district with the scrambler of neighbor cell.
With reference to the basic scrambler group shown in the table 4 and the corresponding relation of downlink frequency pilot code, belong to according to each scrambler in the code character which basic scrambler group is the table 5 of getting back.
Table 5:
Which basic scrambler group 4 scramblers that table 5 shows in each code character belong to respectively.For example: 4 scramblers of code character 1 belong to basic scrambler group A, B, C, C respectively; 4 scramblers of code character 2 belong to basic scrambler group A, B, C, B respectively.
Distribute in two steps in basic scrambler set of dispense shown in Figure 2 and downlink frequency pilot code, can introduce different optimization methods as required, thereby improve the overall synthetic performance of code word planning and the probability that is allocated successfully.To this, the present invention has proposed a kind of simply and effectively distribution method respectively to basic scrambler set of dispense and downlink frequency pilot code distribution.Can the basic point of departure of the method that basic scrambler set of dispense and downlink frequency pilot code are distributed be to investigate search corresponding basic scrambler group/downlink frequency pilot code, the scrambler that guarantees each sectorized cells under the same base station belongs to same basic scrambler group, and the scrambler that the minizone of different base station is distributed belongs to different basic scrambler groups.
With reference to Fig. 3, Fig. 3 show embodiment illustrated in fig. 2 in the allocation flow figure of basic scrambler group, may further comprise the steps:
Step 301: base station that need to determine allocation base scrambler group.
Step 302: check the basic scrambler group that this base station can be distributed.
The method of checking is: which basic scrambler group the adjacent base station of checking this base station has distributed, and has only the basic scrambler group of not used by adjacent base station just can be assigned with.For example, basic scrambler component is 12 of A, B, C, D... etc., and adjacent base station has 6, but has only an adjacent base station to be assigned as basic scrambler group A, and then the basic scrambler group that can distribute of this base station is exactly 11 of basic scrambler group B, C, D... etc.
Step 303: in the basic scrambler group that can distribute, press predefined procedure and select a basic scrambler group.Such as, select by the order of basic scrambler group.
Step 304: check the basic scrambler group that all adjacent base stations of this base station have distributed successively, determine whether the basic scrambler group of selecting is available.
The method of checking is: each adjacent base station is checked see whether this base scrambler group is used successively in these adjacent base stations, if be used, then should base scrambler group just can not be used in base station to be allocated.
If available, then execution in step 305: upgrade allocation result and whether check all allocation base scrambler groups of all base stations.
If all base stations are all distributed, then execution in step 306: successfully finish assigning process.
Otherwise, execution in step 307: select next base station to be allocated, and return step 302.
If unavailable, then execution in step 308: judge whether all the basic scrambler groups that can distribute all inspected finish.
If then execution in step 309: distribute failure, finish assigning process.
Otherwise, execution in step 310: select the next basic scrambler group that can distribute, return step 304 then.
The basic scrambler group of all base stations just can be carried out the distribution of the downlink frequency pilot code of each base station respective cell after determining, at this moment the distribution method of distribution method that is adopted and above-mentioned basic scrambler group is similar.
With reference to Fig. 4, Fig. 4 shows the allocation flow figure of middle downlink frequency pilot code embodiment illustrated in fig. 2, may further comprise the steps:
Step 401: sub-district that need to determine the allocation of downlink pilot code.
Step 402: check the downlink frequency pilot code that this sub-district can be distributed.
The method of checking is: the basic scrambler group of having distributed according to this cell base station and the corresponding relation of downlink frequency pilot code earlier obtain all downlink frequency pilot code of this base scrambler group correspondence; The neighbor cell of checking this sub-district has then distributed the downlink frequency pilot code which should base scrambler group correspondence, the downlink frequency pilot code of this base scrambler group correspondence of not used by neighbor cell is defined as distributing to the downlink frequency pilot code of this sub-district.
For example, if the basic scrambler group of sub-district is A, then according to table 4, optionally downlink frequency pilot code is totally 11 downlink frequency pilot code that code character is numbered 1,2,7,8,9,11,13,14,15,22,23 correspondences, whether the neighbor cell around checking has distributed some downlink frequency pilot code wherein, is not exactly the downlink frequency pilot code scope that this sub-district can be distributed by the downlink frequency pilot code of neighbor cell use on every side.
Step 403: in the downlink frequency pilot code that can distribute, press predefined procedure and select a downlink frequency pilot code.Such as, select by the order of descending pilot code.
Step 404: check the downlink frequency pilot code that all neighbor cells of this sub-district have distributed successively, determine whether the downlink frequency pilot code of selecting is available.
The method of checking is: each neighbor cell is checked see whether this downlink frequency pilot code is used successively in these neighbor cells, if be used, then this downlink frequency pilot code just can not be used in sub-district to be allocated.
If available, then execution in step 405: upgrade allocation result and whether check all allocation of downlink pilot code of all sub-districts.
If all sub-districts are all distributed, then execution in step 406: successfully finish assigning process.
Otherwise, execution in step 407: select next sub-district to be allocated, and return step 402.
If unavailable, then execution in step 408: judge whether all downlink frequency pilot code that can distribute all inspected finish.
If then execution in step 409: distribute failure, finish assigning process.
Otherwise, execution in step 410: select the next downlink frequency pilot code that can distribute, return step 404 then.
Utilize above-mentioned basic scrambler set of dispense shown in Figure 3 and descending pilot frequency code distributing method shown in Figure 4, can realize the code word planning of sectorized cells apace.
Because the downstream signal of TD-SCDMA system base-station emission all is a strict synchronism, and the upward signal of terminal emission also to make its main footpath of inhibit signal when arriving the base station by uplink synchronous control be synchronous, therefore by method provided by the invention can guarantee as shown in Figure 1 terminal A and two very near complete quadratures of user's spreading code of distance that belong to different sectors of terminal B, so just can eliminate the phase mutual interference between these two terminals basically.
Because the mobility of terminal, therefore in order to improve the overall performance of system, in real system, also need to use dynamic channel allocating technology in order, avoid making in edge, the sector appearance situation relevant fully with the terminal spreading code of adjacent sectors because of terminal moves, one of them terminal is adjusted to other different time-gaps or carrier frequency, thereby avoid interference effectively and the call drop phenomenon that causes.
Dynamic channel allocating technology in order in the system equipment mainly realizes in the radio network controller (RNC) of TD-SCDMA system, and the direction angle of arrival AOA information that can utilize the base station to report to the relevant terminal of RNC guarantees that channel code that the terminal in the same time slot in edge, sector distributes the identical situation of compound key do not occur with the user at edge, adjacent sector.The AOA information here is the direction angle of arrival that the base station utilizes the terminal of smart antenna acquisition to transmit, and it has reflected the angle position of terminal pins to same base station.
Fig. 5 shows when terminal initial inserts the user who guarantees not with edge, adjacent sector and the identical a kind of possible embodiments of compound key occurs, may further comprise the steps:
Step 501:RNC obtains the AOA information that accesses terminal, and will access terminal is designated as B.
Step 502: with AOA is the center, (a, a) whether inspection has the terminal that belongs to adjacent sectors in the scope, and the terminal that will belong to adjacent sectors is designated as A.
Step 503: utilize this cell scrambling, adjacent sectors scrambler and all to belong to the channel code of the terminal A of adjacent sectors, calculate the channel code that has the terminal B of complete related compound sign indicating number with the channel code of terminal A, it is designated as set C.
Step 504: if set C non-NULL is then got rid of the element among the set C when being terminal B assigns channelization codes.
Maximum interference angle a in the above-mentioned flow process is an engineering experience value.And in the mobile communication process behind the terminal connecting system, can adopt the method in the flow chart to judge that the AOA with this terminal is the center too, (a, a) whether there is adjacent sector terminal in the angular range with time slot, and according to adjacent sector scrambler, the channel code that the channel code of this cell scrambling and adjacent sector terminal is checked this terminal whether can with situation that should exist compound key to overlap with the time slot terminal of adjacent sector, if the situation that exists compound key to overlap, then system will adopt dynamic channel allocating technology in order that one of terminal of phase mutual interference is adjusted to other time slot, so just can avoid strongly disturbing appearance at the edge, sector.
As seen, compared with prior art, scrambler allocative decision of the present invention, can guarantee the TD-SCDMA system when the user begins to insert and the nearer user in the position at edge, sector have the spreading code of entirely true quadrature, avoided overlapping the strong jamming of introducing because of compound key occurring between different base station.Further combined with dynamic channel allocating technology in order, also can avoid effectively making in edge, the sector appearance situation relevant fully with the terminal spreading code of adjacent sectors because of terminal moves.And, so just improved the performance of system on the whole because each channel code is only relevant fully with one of 16 channel codes in adjacent sector, and therefore, the signaling recruitment that causes owing to dynamic channel allocation can be very not big yet.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (13)
1, a kind of method that reduces co-channel interference between the sector is characterized in that, described method comprises step:
A, the scrambler that repeated code may be appearred in compound key are formed a plurality of basic scrambler groups, and are obtained the corresponding relation of basic scrambler group and downlink frequency pilot code according to the grouping situation of basic scrambler group;
B, be the adjacent different basic scrambler group of base station assigns;
C, according to the corresponding relation of basic scrambler group and downlink frequency pilot code, be downlink frequency pilot code different of each cell allocation with the neighbor cell downlink frequency pilot code;
D, according to the downlink frequency pilot code of cell allocation and with the corresponding relation of basic scrambler group, determine the scrambler of this sub-district.
2, method according to claim 1 is characterized in that, described steps A comprises:
The compound key that all scramblers and orthogonal variable spreading factor sign indicating number OVSF are combined carries out correlation calculations in twos, and the scrambler that compound key may be overlapped is divided into one group, and being divided into is 12 groups of base scrambler groups;
According to the block number at each scrambler place and the corresponding relation of downlink frequency pilot code in the basic scrambler group, set up the corresponding relation of basic scrambler group and downlink frequency pilot code.
3, method according to claim 1 is characterized in that, described step B comprises:
B1, need to determine the base station of allocation base scrambler group and the basic scrambler group that this base station can be distributed successively;
B2, the basic scrambler group of using according to all adjacent base stations of this base station be base station selected available basic scrambler group in the described basic scrambler group that can distribute.
4, method according to claim 3 is characterized in that, described step B2 comprises:
B21, in the described basic scrambler group that can distribute, be base station selected basic scrambler group by basic scrambler set of dispense predefined procedure;
Whether B22, the basic scrambler group of determine selecting in the following manner be available:
Check in all adjacent base stations of this base station the basic scrambler group whether described selection is used in existing base station successively; If should base scrambler group be used, should base scrambler group be unavailable then; Otherwise should base scrambler group be available;
If B23 is available, the basic scrambler group of selecting for this base station assigns and upgrade allocation result then;
If still have available basic scrambler group in the basic scrambler group that B24 is unavailable and described energy distributes, then select next basic scrambler group by described predefined procedure, return step B22 then.
5, method according to claim 4 is characterized in that, described basic scrambler set of dispense predefined procedure is putting in order of basic scrambler group.
6, method according to claim 1 is characterized in that, described step C comprises:
C1, need to determine the sub-district of allocation of downlink pilot code successively;
C2, determine the downlink frequency pilot code that this sub-district can be distributed;
C3, the downlink frequency pilot code of using according to all neighbor cells of this sub-district be available downlink frequency pilot code of this cell selecting in the described downlink frequency pilot code that can distribute.
7, method according to claim 6 is characterized in that, described step C2 comprises:
C21, the basic scrambler group of having distributed according to this cell base station and the corresponding relation of downlink frequency pilot code obtain all downlink frequency pilot code of this base scrambler group correspondence;
The downlink frequency pilot code that C22, the downlink frequency pilot code of not used by neighbor cell in should all downlink frequency pilot code of base scrambler group correspondence can be distributed as described this sub-district.
8, method according to claim 6 is characterized in that, described step C3 comprises:
C31, to distribute predefined procedure by descending pilot code be downlink frequency pilot code of this cell selecting in the described downlink frequency pilot code that can distribute;
Whether C32, the downlink frequency pilot code of determine selecting in the following manner be available:
Check in all neighbor cells of this sub-district the downlink frequency pilot code whether described selection is used in existing sub-district successively; If this downlink frequency pilot code is used, then this downlink frequency pilot code is unavailable; Otherwise this downlink frequency pilot code is available;
If C33 is available, the downlink frequency pilot code of selecting for this cell allocation and upgrade allocation result then;
If still have available downlink frequency pilot code in the downlink frequency pilot code that C34 is unavailable and described energy distributes, then select next downlink frequency pilot code by described predefined procedure, return step C32 then.
9, method according to claim 8 is characterized in that, it is putting in order of downlink frequency pilot code that described downlink frequency pilot code is distributed predefined procedure.
10, method according to claim 1 is characterized in that, described step D comprises:
D1, according to the downlink frequency pilot code of cell allocation and with the corresponding relation of basic scrambler group, which basic scrambler group each scrambler that obtains in the code character of this downlink frequency pilot code correspondence belongs to respectively;
All scramblers that D2, the basic scrambler group of selecting this cell allocation and downlink frequency pilot code are all corresponding;
D3, from the scrambler of selecting, select a scrambler different, be defined as the scrambler of this sub-district with the scrambler of neighbor cell.
11, method according to claim 1 is characterized in that, described sub-district comprises: sectorized cells and/or omni cell.
12, method according to claim 1 is characterized in that, described method also comprises step:
E, when having the situation that compound key overlaps with adjacent sector terminal, one of terminal of phase mutual interference is adjusted to other time slots with time slot when accessing terminal.
13, method according to claim 12 is characterized in that, described step e comprises:
Whether there is adjacent sector terminal in the preset range that E1, real-time detection are the center to access terminal with time slot;
E2, when having described adjacent sector terminal with time slot, check the situation whether described channel code that accesses terminal exists compound key to overlap with the channel code of described adjacent sector terminal according to the channel code of adjacent sector scrambler, this cell scrambling and adjacent sector terminal;
If the situation that E3 exists compound key to overlap then adopts dynamic channel allocating technology in order that one of terminal of phase mutual interference is adjusted to other time slots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510089994XA CN100409715C (en) | 2005-08-09 | 2005-08-09 | Method for reducing co-channel interference in sector interval |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510089994XA CN100409715C (en) | 2005-08-09 | 2005-08-09 | Method for reducing co-channel interference in sector interval |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1913695A true CN1913695A (en) | 2007-02-14 |
| CN100409715C CN100409715C (en) | 2008-08-06 |
Family
ID=37722423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510089994XA Expired - Fee Related CN100409715C (en) | 2005-08-09 | 2005-08-09 | Method for reducing co-channel interference in sector interval |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100409715C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312587B (en) * | 2007-05-24 | 2011-12-07 | 中兴通讯股份有限公司 | Method for reducing co-channel interference of downlink |
| CN104936238A (en) * | 2009-08-05 | 2015-09-23 | 高通股份有限公司 | Access Point Identification Based On Multiple Pilot Signature Indicators |
| WO2017012397A1 (en) * | 2015-07-20 | 2017-01-26 | 索尼公司 | Electronic device in radio communications system and radio communications method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1146163C (en) * | 2000-10-20 | 2004-04-14 | 华为技术有限公司 | Method of raising TD-CDMA system channel estimation accuracy |
| GB2374252A (en) * | 2001-04-04 | 2002-10-09 | Ubinetics Ltd | Identification of neighbouring cell scrambling codes |
| JP3808323B2 (en) * | 2001-05-10 | 2006-08-09 | 株式会社エヌ・ティ・ティ・ドコモ | Uplink scrambling code assignment method and mobile communication system |
| US7453863B2 (en) * | 2002-04-04 | 2008-11-18 | Lg Electronics Inc. | Cell searching apparatus and method in asynchronous mobile communication system |
-
2005
- 2005-08-09 CN CNB200510089994XA patent/CN100409715C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312587B (en) * | 2007-05-24 | 2011-12-07 | 中兴通讯股份有限公司 | Method for reducing co-channel interference of downlink |
| CN104936238A (en) * | 2009-08-05 | 2015-09-23 | 高通股份有限公司 | Access Point Identification Based On Multiple Pilot Signature Indicators |
| WO2017012397A1 (en) * | 2015-07-20 | 2017-01-26 | 索尼公司 | Electronic device in radio communications system and radio communications method |
| US10206150B2 (en) | 2015-07-20 | 2019-02-12 | Sony Corporation | Electronic device in radio communications system and radio communications method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100409715C (en) | 2008-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1153485C (en) | Pilot PN offset assigning method for digital mobile telecommunications sytem | |
| CN1061492C (en) | Method for exchanging data between a base transceiver station of a mobile radio network and a mobile station in the network | |
| US8265028B2 (en) | Distributed allocation of physical cell identifiers | |
| CN1934804A (en) | Method and apparatus for joint detection in downlink TDD CDMA | |
| CN1882187A (en) | A method for uplink interference coordination in single frequency networks, a base station, a mobile terminal and a mobile network therefor | |
| CN1672348A (en) | Resource allocation to users in slotted code division multiple access systems using beams | |
| CN101064564A (en) | Wireless communication system, pilot sequence allocation apparatus, and mobile station | |
| CN1929323A (en) | Method of suppressing cross time slot interfere for time slot CDMA system | |
| CN1156925A (en) | System and method for managing neighbor-channel interference in channelized cellular systems | |
| CN1454413A (en) | Modified finger assignment algorithm for high data rate calls | |
| CN1977468A (en) | Method and arrangement for mitigation of intercell interference in a cellular communication system | |
| CN1750703A (en) | Method for distributing radio resource in multiple carrier time-division duplex mobile communication system | |
| CN1271238A (en) | CDMA frequency distribution for fixed radio application | |
| CN1234657A (en) | Wireless long-distance communication system of reducing multi-path fading effect | |
| US8036198B2 (en) | Method and system for managing communication in an OFDMA system | |
| CN1960557A (en) | Method for reducing interference between sectors in orthogonal frequency division multiplex system | |
| CN1738473A (en) | Channel allocation method for multi-carrier CDMA system | |
| CN1150697C (en) | TDD framing method for physical layer of wireless system | |
| CN1113575C (en) | Method and device in mobile telecommunication network | |
| CN1306702A (en) | Method and appts. for collector arrays of directional antennas Co-located with zone managers in wireless communications systems | |
| CN1913695A (en) | Method for reducing co-channel interference in sector interval | |
| CN1611089A (en) | Cellular telecommunication network using cells of different sizes, corresponding base station, terminal and method | |
| CN1882156A (en) | Downlink beam shaping method for multicast service system | |
| KR101083549B1 (en) | Method for allocating channelization codes in a cdma system | |
| CN1707974A (en) | Cell scramble distributing method for time division-synchronous code division multiple access system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: INST OF TELECOMMUNICATION SCIENCE AND TECHNOLGOY Free format text: FORMER OWNER: DATANG MOBILE COMMUNICATION EQUIPMENT CO., LTD. Effective date: 20110429 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100083 NO. 29, XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING TO: 100083 NO. 40, XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20110429 Address after: 100083 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100083 Haidian District, Xueyuan Road, No. 29, Patentee before: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20210809 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |