CN1798005B - Method of same regional coverage in multiple subzones in TDS-CDMA system - Google Patents
Method of same regional coverage in multiple subzones in TDS-CDMA system Download PDFInfo
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- CN1798005B CN1798005B CN200410101507A CN200410101507A CN1798005B CN 1798005 B CN1798005 B CN 1798005B CN 200410101507 A CN200410101507 A CN 200410101507A CN 200410101507 A CN200410101507 A CN 200410101507A CN 1798005 B CN1798005 B CN 1798005B
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Abstract
The method includes following steps: when building a sub zone, RNC adds an identifier of covering same geographic area for multiple sub zones of covering same area; Node B carries out conversion fromlocal sub zone in single carrier frequency to mixing sub zone for multiple local sub zones with same identifier; frequency hopping frame of each mixing sub zone contains down going time slot on singlecarrier frequency of all local sub zone; Node B uses maximal transmitting power covering local area as transmitting power for a mixing sub zone; and powers are degressive for other mixing sub zone; then, with time slot being as unit, carrying out frequency hopping transmitting for each frequency hopping frame based on determined power; sob zone with largest transmitting power is a broadcasting and beaconing sub zone. Advantages are: reducing interference between carriers, reducing measuring and switching number at same time by mobile terminals, and raised access capacity.
Description
Technical field
The present invention relates to the wireless telecommunication system of TD-SCDMA (TD SDMA) standard, specifically, relate to a kind of method of in this system, same geographic area being carried out the covering of many sub-districts.
Background technology
TD-SCDMA (being LCR TDD) is a tdd systems, in 3GPP (The 3rdGeneration Partnership Project) standard, in the TD-SCDMA standard based on low spreading rate, each subframe comprises that 7 business time-slot TS (timeslot) add two pilot time slots, two up-downgoing transfer points, first frequency inverted point is fixed, second frequency inverted point can be adjusted according to the ratio of up-downgoing traffic carrying capacity, TS0 is fixed as descending time slot, fixed allocation broadcast channel and beacon channel on time slot TS0, TS1 is fixed as ascending time slot, distributes PRACH channel (Reverse Access Channel) on it, each subframe 5ms, frame structure as shown in Figure 1.
In the TD-SCDMA system, the definition that the sub-district is the clearest and the most definite is to launch independently TD-SCDMA frame, independently common signal channel, pilot channel and Traffic Channel are arranged, a unique local district identification (Local Cell Id) is arranged, unique UARFN (frequency identification number) is also arranged, corresponding to Node B carrier frequency processing unit.
In order to increase the traffic carrying capacity of sub-district, can adopt many sub-districts to cover same geographic area, distribute a plurality of local district identifications, many sub-districts cover can adopt co-frequency cell or alien-frequency district.For a plurality of sub-districts in the same geographic area, in present TD-SCDMA standard, the Uu interface all independently carries out at each sub-district for operation, the configuration of Radio Resource.Promptly to a plurality of sub-districts in the same geographic area, each sub-district is the complete common signal channel of separate configurations one cover separately, wherein the BCH of each sub-district (broadcast channel), FACH (forward access channel) and PCH (paging channel) are omnidirectional channel, cover whole geographic area.
UE (portable terminal) resides in which sub-district in a plurality of sub-districts in this geographic area, is that UE carries out separately according to the measurement of oneself, exists most of UE to wish to reside in the situation of same sub-district.In the overlapping region of two adjacent geographic cell, 6 of will carry out can carrying out greater than self of UE measure number simultaneously, cause UE to be difficult to differentiate measurement result.
In addition, many sub-districts coverage mode in this same geographic area, the base station requires very high to transmitter power when actual networking, phase mutual interference between carrier frequency is obvious, only reliable traffic carrying capacity hour is closed some sub-districts as far as possible or is further dwindled the geographic area of sub-district, reduce mutual interference, but can impact business.
Summary of the invention
The technical problem to be solved in the present invention provides the method that a kind of multiple sectors at same time in TD-SCDMA zone covers, and can reduce between carrier frequency to disturb, reduce mobile terminal UE and measure number of times and switching times simultaneously, improves access capacity.
In order to solve the problems of the technologies described above, the invention provides the method that a kind of multiple sectors at same time in TD-SCDMA zone covers, may further comprise the steps:
When (a) radio network controller was set up in the sub-district, the home cell that covers for multiple sectors at same added the sign that covers same geographic area, and informing base station;
(b) the base station a plurality of home cells identical to described sign carry out the one by one corresponding conversion of single carrier frequency home cell to the mixing sub-district, all comprise the descending time slot on all described home cell list carrier frequency on the frequency hopping frame of each mixing sub-district;
(c) base station is with the maximum transmission power that covers the one's respective area Initial Trans as a mixing sub-district, and the Initial Trans of other mixing sub-districts is determined by the mode of successively decreasing successively;
(d) base station is unit with the time slot, according to the transmitting power of determining the frequency hopping frame of each mixing sub-district is carried out the frequency hopping emission, and serves as broadcasting and beacon sub-district with the sub-district of transmitting power maximum;
(e) base station reports the correspondence relationship information of redistributing mixing sub-district, back and home cell.
Further, said method can have following characteristics: described step (b) further may further comprise the steps:
(b1) cell attribute is differentiated in the base station, and statistics is with the sub-district number N of coverage cell, and the ascending time slot of definite each sub-district is counted N
uCount N with descending time slot
d
(b2), make the descending time slot that has all comprised on each the mixing sub-district frequency hopping frame that obtains on all home cell list carrier frequency with the descending time slot combined crosswise of each home cell list carrier frequency;
(b3) base station according to cover same geographic area sign with the sign of home cell one by one corresponding conversion be the mixing cell ID.
Further, said method can have following characteristics: in the described step (b2), cell carrier frequencies number N equals descending time slot number N
dThe time, the form of each frequency hopping frame is as follows:
Wherein, F
0, F
1..., F
j... F
N-1Be the carrier frequency of N home cell, press the absolute wireless frequency numbering of UTRA (wireless universal access platform) frequency numbering from low to high and arrange HF
1, HF
2..., HF
j... HF
NBe the frequency hopping frame of the mixing carrier frequency after the conversion, the subscript of TS is represented the carrier frequency of the affiliated home cell of this time slot in the formula, and following target numeral represents that then this time slot is which time slot in this carrier frequency frame.
Further, said method can have following characteristics: in the described step (b2), cell carrier frequencies number N is less than descending time slot number N
dThe time, the form of each frequency hopping frame is as follows:
Wherein, F
0, F
1..., F
j... F
N-1Be the carrier frequency of N home cell, press the absolute wireless frequency numbering of UTRA frequency numbering from low to high and arrange HF
1, HF
2..., HF
j... HF
NBe the frequency hopping frame of the mixing carrier frequency after the conversion, the subscript of TS is represented the carrier frequency of the affiliated home cell of this time slot in the formula, and following target numeral represents that then this time slot is which time slot in this carrier frequency frame.
Further, said method can have following characteristics: in the described step (c), the Initial Trans of each mixing sub-district is linear decrease successively.
Further, said method can have following characteristics: the Initial Trans of described each mixing sub-district is pressed following formula and is determined:
Wherein, P
MaxFor covering the maximum transmission power of one's respective area, P
kBe the power of N mixing sub-district being numbered k, k=0,1 ..., N-1, and the frequency hopping that is numbered the mixing sub-district correspondence of k is HF frequently
K+1, N
uBe ascending time slot number, N
dBe the descending time slot number.
Further, said method can have following characteristics: in the described step (d), the base station is standby broadcasting and beacon sub-district with second largest sub-district of transmitting power also.
Further, said method can have following characteristics: in the described step (d), the slow frequency hopping emission is carried out to described frequency hopping frame in the base station.
Further, said method can have following characteristics: also comprise step between described step (d) and the step (e): portable terminal is measured multiple carrier frequency power, radio network controller is according to the measurement result of portable terminal signal strength signal intensity or Timing Advance, in covering some mixing sub-district of this portable terminal position, with the dedicated channel priority allocation of this portable terminal on little mixing sub-district, overlay area.
Further, said method can have following characteristics: in the described step (e), the base station also reports the information of the transmitting power of the sign of active and standby broadcasting and beacon sub-district and each mixing sub-district.
Therefore, after application the inventive method, the total transmitting power in a plurality of sub-districts of same geographic area reduces, thereby can reduce the phase mutual interference between carrier frequency.Because be active and standby broadcast beacon sub-district with two mixing sub-districts wherein only, the TSo time slot of other sub-district can be used as business time-slot, thereby has enlarged the capacity of system, has eliminated the interference of minizone broadcast channel.Because in the present invention, the coverage of each mixing sub-district is descending, thereby the quantity that UE carries out cell measurement and switching in described adjacent overlapping region significantly reduces.In addition, the present invention can also overcome the Rayleigh fading of signal transmission, improves speech quality.
Description of drawings
Fig. 1 is a TD-SCDMA frame structure schematic diagram.
Fig. 2 is the flow chart of embodiment of the invention method.
Fig. 3 is the frequency hopping frame HF of first application example of the present invention
1, HF
2, HF
3, HF
4The schematic diagram of corresponding HC cell coverage area.
Embodiment
As shown in Figure 2, the present embodiment method may further comprise the steps:
At first, Node B differentiates cell attribute, and statistics arranges the ascending time slot of each sub-district to count N with the number N of coverage cell LC according to the downlink traffic of single carrier cell
u, and descending time slot is TS
0, TS
Nu+1..., TS
j..., TS
6, be total to N
dIndividual, N
d≤ 6.The present invention requires the sub-district to add up to N≤N
dIndividual, be numbered 0,1 ..., K ..., N-1, if desired greater than N
dPlot planning is again advised in the sub-district of individual carrier frequency.
Then, with the descending time slot combined crosswise of the single carrier frequency in each LC sub-district, obtaining the form of each HC sub-district frequency hopping frame. supposition, former N the absolute wireless frequency numbering of LC sub-district UTRA frequency numbering from low to high is followed successively by F
0, F
1..., F
j... F
N-1, corresponding respectively to of reformulation is numbered 0,1 ..., the frequency hopping frame of the HC sub-district of N-1 is HF
1, HF
2..., HF
j... HF
N, the concrete grammar of conversion is as follows:
First kind of situation, the cell carrier frequencies number equals descending time slot number, i.e. N=N
dThe time, the form of each frequency hopping frame the following is:
Wherein, the subscript of TS represents that this time slot belongs to the carrier frequency of which LC sub-district, and subscript represents that then this time slot is which time slot in this LC cell carrier frequencies frame, for example,
Expression F
2The N of carrier frequency
u+ 1 time slot, N
u+ N-1=6.
Corresponding first kind of situation is below with an application example explanation.Suppose the descending time slot number N of the major-minor carrier frequency sum N in sub-district and each single carrier frequency frame
dAll equal 4, ascending time slot is N
u=3, promptly the descending time slot on the single carrier frequency in each LC sub-district is respectively TS
0, TS
4, TS
5And TS
6At this moment, the frequency hopping frame format of HC sub-district, combination back is:
As can be seen, frequency hopping frame HF
1By F
0TS on the carrier frequency
0Time slot and Dwpts time slot, carrier frequency F
1On TS
4Time slot is (as N
dDifference also may be the TS immediately following the descending time slot of second transfer point
2, TS
3Time slot etc.), carrier frequency F
2On TS
5Time slot, and carrier frequency F
3On TS
6Time slot.The TS of other frequency hopping frame
0Time slot is identical with the TS0 time slot of the single carrier frequency in corresponding LC sub-district, and the descending time slot of back is formed by the mode that the UARFN frequency point number increases progressively frequency.
Second kind of situation, cell carrier frequencies number be during less than the descending time slot number, i.e. N<N
dThe time, because N
u+ N-1 is less than 6, so increased a part on the basis of first kind of situation, the form of this each frequency hopping frame of HC sub-district is as follows:
Identical under the implication of each symbol and the first kind of situation in the following formula, identical under the time slot compound mode of front and the first kind of situation for each frequency hopping frame, the time slot that the back replenishes then with this hybrid frame TS
0Other descending time slots of corresponding carrier frequency are identical, and the benefit of doing like this is not bring the frequency hopping factor into.
Corresponding second kind of situation is below with the explanation of Another application example.Suppose sub-district major-minor carrier frequency sum N=2, the descending time slot number N of each single carrier frequency frame
d=4, ascending time slot still is N
u=3, the descending time slot on the single carrier frequency in each LC sub-district is respectively TS
0, TS
4, TS
5And TS
6At this moment, the form of two frequency hopping frames of HC sub-district, combination back is as follows:
As can be seen, frequency hopping frame HF
1By F
0TS on the carrier frequency
0Time slot and Dwpts time slot, carrier frequency F
1On TS
4Time slot, and carrier frequency F
0On TS
5, TS
6Time slot is formed.Frequency hopping frame HF
2Composition also can directly find out by following formula, repeat no more.
Need to prove, the above-mentioned mode that LC sub-district single carrier frequency descending time slot combined crosswise is obtained the frequency hopping frame is not unique, in the selection of order that makes up and time slot, also conversion can be arranged, but should guarantee all to comprise in each frequency hopping frame the descending time slot of all LC sub-districts.
At last, NodeB according to cover same geographic area sign with the ID of home cell one by one corresponding conversion be mixing sub-district ID.Like this, NodeB has converted single carrier cell of the same geographic area of a plurality of coverings to the mixing sub-district of same quantity.
Suppose that the maximum transmission power that covers the one's respective area is P
Max, be numbered k (k=0,1 ..., the power P of N N-1) mixing sub-district
kCalculate by following formula, wherein:
That is frequency hopping frame HF,
1(comprise carrier frequency F
0On TS
0Time slot and descending pilot frequency time slot Dwpts, carrier frequency F
1Last TS
4Time slot, carrier frequency F
2Last TS
5With carrier frequency F
3Last TS
6Time slot) to cover the power (P of whole geographic area
Max) emission.Frequency hopping frame HF
2With power P less than the first beacon sub-district
Max* 6/7 emission.The transmitting power of other sub-districts is linear decrease successively, frequency hopping frame HF
NThe transmitting power minimum, equal P
Max* 4/7.As shown in Figure 3, the mixing sub-district after the conversion will have nothing in common with each other on the geographic area covers according to transmitting power.
Need to prove that the transmitting power of above-mentioned each HC sub-district is not limited to the mode of linear decrease, can in Cell Broadcast CB, broadcast the method for successively decreasing.
Under the situation of first application example, will be near the UE of cell edge at HF
1Assigned with dedicated channel on the frame, near the UE of cell edge inboard at HF
2Assigned with dedicated channel on the frame, near the UE in the middle of the sub-district at HF
3Assigned with dedicated channel on the frame, near the UE around the base station then at HF
4Assigned with dedicated channel on the frame.
The ascending time slot of each mixing sub-district, the present invention is identical in the processing and the primary standard of UE side and network side.
In sum, after application the inventive method, the total transmitting power in a plurality of sub-districts of same geographic area reduces, thereby can reduce the phase mutual interference between carrier frequency.Because be active and standby broadcast beacon sub-district with two mixing sub-districts wherein only, the TSo time slot of other sub-district can be used as business time-slot, thereby has enlarged the capacity of system, has eliminated the interference of minizone broadcast channel.Because in the present invention, the coverage of each mixing sub-district is descending, thereby the quantity that UE carries out cell measurement and switching in described adjacent overlapping region significantly reduces.In addition, the present invention can also overcome the Rayleigh fading of signal transmission, improves speech quality.
Claims (10)
1. the method that covers of multiple sectors at same time in TD-SCDMA zone may further comprise the steps:
When (a) radio network controller was set up in the sub-district, the home cell that covers for multiple sectors at same added the sign that covers same geographic area, and informing base station;
(b) the base station a plurality of home cells identical to described sign carry out the one by one corresponding conversion of single carrier frequency home cell to the mixing sub-district, all comprise the descending time slot on all described home cell list carrier frequency on the frequency hopping frame of each mixing sub-district;
(c) base station is with the maximum transmission power that covers the one's respective area Initial Trans as a mixing sub-district, and the Initial Trans of other mixing sub-districts is determined by the mode of successively decreasing successively;
(d) base station is unit with the time slot, according to the transmitting power of determining the frequency hopping frame of each mixing sub-district is carried out the frequency hopping emission, and serves as broadcasting and beacon sub-district with the sub-district of transmitting power maximum;
(e) base station reports the correspondence relationship information of redistributing mixing sub-district, back and home cell.
2. the method for claim 1 is characterized in that, described step (b) further may further comprise the steps:
(b1) cell attribute is differentiated in the base station, and statistics is with the sub-district number N of coverage cell, and the ascending time slot of definite each sub-district is counted N
uCount N with descending time slot
d
(b2), make the descending time slot that has all comprised on each the mixing sub-district frequency hopping frame that obtains on all home cell list carrier frequency with the descending time slot combined crosswise of each home cell list carrier frequency;
(b3) base station according to cover same geographic area sign with the sign of home cell one by one corresponding conversion be the mixing cell ID.
3. method as claimed in claim 2 is characterized in that, in the described step (b2), cell carrier frequencies number N equals descending time slot number N
dThe time, the form of each frequency hopping frame is as follows:
Wherein, F
0, F
1..., F
j... F
N-1Be the carrier frequency of N home cell, press the absolute wireless frequency numbering of wireless universal access platform frequency numbering from low to high and arrange HF
1, HF
2..., HF
j... HF
NBe the frequency hopping frame of the mixing carrier frequency after the conversion, the subscript of TS is represented the carrier frequency of the affiliated home cell of this time slot in the formula, and following target numeral represents that then this time slot is which time slot in this carrier frequency frame.
4. method as claimed in claim 2 is characterized in that, in the described step (b2), cell carrier frequencies number N is less than descending time slot number N
dThe time, the form of each frequency hopping frame is as follows:
Wherein, F
0, F
1..., F
j... F
N-1Be the carrier frequency of N home cell, press the absolute wireless frequency numbering of UTRA frequency numbering from low to high and arrange HF
1, HF
2..., HF
j... HF
NBe the frequency hopping frame of the mixing carrier frequency after the conversion, the subscript of TS is represented the carrier frequency of the affiliated home cell of this time slot in the formula, and following target numeral represents that then this time slot is which time slot in this carrier frequency frame.
5. the method for claim 1 is characterized in that, in the described step (c), the Initial Trans of each mixing sub-district is linear decrease successively.
6. method as claimed in claim 5 is characterized in that, the Initial Trans of described each mixing sub-district is pressed following formula and determined:
Wherein, P
MaxFor covering the maximum transmission power of one's respective area, P
kBe the power of N mixing sub-district being numbered k, k=0,1 ..., N-1, and the frequency hopping frame that is numbered the mixing sub-district correspondence of k is HF
K+1, N
uBe ascending time slot number, N
dBe the descending time slot number.
7. the method for claim 1 is characterized in that, in the described step (d), the base station is standby broadcasting and beacon sub-district with second largest sub-district of transmitting power also.
8. the method for claim 1 is characterized in that, in the described step (d), the slow frequency hopping emission is carried out to described frequency hopping frame in the base station.
9. the method for claim 1, it is characterized in that, also comprise step between described step (d) and the step (e): portable terminal is measured multiple carrier frequency power, radio network controller is according to the measurement result of portable terminal signal strength signal intensity or Timing Advance, in covering some mixing sub-district of this portable terminal position, with the dedicated channel priority allocation of this portable terminal on little mixing sub-district, overlay area.
10. the method for claim 1 is characterized in that, in the described step (e), the base station also reports the information of the transmitting power of the sign of active and standby broadcasting and beacon sub-district and each mixing sub-district.
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Families Citing this family (5)
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CN100464612C (en) * | 2007-01-22 | 2009-02-25 | 协同智迅通信技术(深圳)有限公司 | Digital cluster communication method with the control channel frequency hopping function |
CN101237604B (en) * | 2007-01-30 | 2011-06-15 | 展讯通信(上海)有限公司 | Single-frequency networking method in TD-SCDMA system |
CN101771438B (en) * | 2009-01-05 | 2012-08-29 | 电信科学技术研究院 | Frequency-hopping method, system and device |
CN101635584A (en) * | 2009-08-21 | 2010-01-27 | 中兴通讯股份有限公司 | Method and system for data transmission of hybrid frequency hopping |
US20130163519A1 (en) * | 2010-06-25 | 2013-06-27 | Nokia Corporation | Reduced cell id reassignments in multi-band local area |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US6327297B1 (en) * | 1993-02-17 | 2001-12-04 | Interdigital Technology Corporation | Frequency hopping code division multiple access system and method |
CN1159878C (en) * | 2000-12-07 | 2004-07-28 | 华为技术有限公司 | Macrodiversity-based direct retry method for CDMA system |
CN1162983C (en) * | 1999-08-27 | 2004-08-18 | 艾利森电话股份有限公司 | Method and device for improving the capacity of GSM base station |
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2004
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US6327297B1 (en) * | 1993-02-17 | 2001-12-04 | Interdigital Technology Corporation | Frequency hopping code division multiple access system and method |
CN1162983C (en) * | 1999-08-27 | 2004-08-18 | 艾利森电话股份有限公司 | Method and device for improving the capacity of GSM base station |
CN1159878C (en) * | 2000-12-07 | 2004-07-28 | 华为技术有限公司 | Macrodiversity-based direct retry method for CDMA system |
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