CN101426211A - Wireless access network frequency using method used for distributed base station constitution - Google Patents
Wireless access network frequency using method used for distributed base station constitution Download PDFInfo
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Abstract
The present invention provides a method for using the frequency of a wireless access network composed of distributed base stations. The method comprises the following steps: first, dividing the working frequency-band of the wireless access network into two sub-frequency-bands; afterwards, dividing a sub-frequency-band in the two sub-frequency-bands into N orthogonal sub-carrier-wave groups which do not overlap with each other, the remote-end unit of a main radio frequency of each macro district uses one group in the N orthogonal sub-carrier-wave groups and N is the number of the macro district; and lastly, multiplexing the sub-carrier-wave in the N-1 orthogonal sub-carrier-wave groups used by the remote-end unit of main radio frequency of N-1 macro districts and the sub-carrier-wave in the other sub-frequency-band in the two sub-frequency-bands between the remote-end units in the macro district. The technical scheme according to the invention combines the characteristic of distributed base station, realizes the high-efficiency using of frequency in micro district, macro district and between the micro district and the macro district when a lower interface of each macro district is guaranteed. The throughput of distributed base station can be increased.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of frequency using method that is used for the wireless access network of distributed base station formation.
Background technology
A kind of basic scheme that solves presence of intercell interference in the prior art is " soft-frequency reuse " or " partial frequency multiplexing ".This technology is divided into the m group with all subcarriers of OFDM (OFDM) system, different neighbor cell selects not on the same group subcarrier as boss's carrier wave of this sub-district, other subcarriers are as the auxiliary son carrier waves of this sub-district, boss's carrier wave to each sub-district is provided with different transmitting power thresholdings with auxiliary son carrier waves again, and the transmitting power thresholding of boss's carrier wave is higher than the transmitting power thresholding of auxiliary son carrier waves, determines cell boarder with the coverage of boss's carrier wave.What distribute from the cell centre to the cell edge is boss's carrier wave, and it can cover the scope of whole sub-district; What white space distributed is auxiliary son carrier waves, the inside of its coverage cell.Like this, for inside, sub-district, mainly adopt the auxiliary son carrier waves transmission data of lower-wattage, because closer from the base station, terminal can receive this sub-district signal clearly, and because auxiliary son carrier waves power is less, the interference between the neighbor cell is also smaller; And all adopt high power main carrier transmission data at each neighbor cell fringe region, what be in that the terminal of fringe region mainly receives is boss's carrier wave of different neighbor cells, because boss's carrier wave non-overlapping of different neighbor cells and be quadrature, so the phase mutual interference will reduce greatly.The patented technology of " soft-frequency reuse " or " partial frequency multiplexing " aspect has CN200510068133, " by the power programming of OFDM mobile communication system being coordinated the method for presence of intercell interference ", CN200610087983, " uplink channel interference is coordinated in the single frequency network method, base station, terminal and network ".In the long evolving system standard of present 3G (Third Generation) Moblie this method is being discussed. the defective of this technology is that the frequency resource of cell edge is restricted, and is difficult to support a large number of users and very high data rate.
Existing channeling technology is based on traditional base station architecture proposition.At present, by RF remote unit RRU (Remote Radio Unit), baseband processing unit BBU (Base Band Unit) constitute at distributed base station, as patented technology 96194056.5, " distributed radio telecommunications system ", for another example, LM Ericsson Telephone Co., Ltd.; Huawei Tech Co., Ltd; Nippon Electric Company, Ltd.; Nortel Networks Ltd.; Siemens Company, " the interface of communicating by letter, device and method between the wireless device Control Node that is used for radio base station and the remote radio devices node " WO/2005/034544//EP1671504//200480028557.0, this distributed base station is cheap because of it, lay convenient will being popularized day by day.
Be illustrated in figure 1 as the double layered wireless access network that a distributed base station constitutes: wireless access network comprises two or more distributed base station D_NodeB (Distributed node Base station), comprises several wireless terminals 103.D_NodeB comprises a baseband processing unit BBU102 and one group of RF remote unit RRU101, and each RRU101 sends its distinguished symbol in the Microcell of its covering.In the one group of RRU101 that constitutes a distributed base station, there is a main RRU 101A (being to be positioned at the centre of sub-district 104 and the represented RRU of triangle that is filled by black among Fig. 1), all the other are attached RRU101, each attached RRU covers a Microcell, one group of Microcell that is covered by attached RRU constitutes the sub-district or the sector 104 of distributed base station, main RRU covers the sub-district or the sector of this distributed base station, and main RRU matches with attached RRU and realizes double-deck the covering.The Microcell that adjacent attached RRU covers spatially exists overlaps, and covers to realize no gap.The BBU of distributed base station realizes communication and control to main RRU and the attached RRU that belongs to this machine station by optical fiber link 106; Belong to the cancellated interface that constitutes by optical fiber link between the BBU of different distributions formula base station and realize communication.This cancellated interface can be the interface that meets certain communication standard, as X2 interface.
In said system, residing geographical position, overlay area (being referred to as Microcell) difference according to the RRU101 that forms a distributed base station, these Microcells (perhaps little sector) are divided into two base class, first kind Microcell is to be in distributed base station overlay area 104A (to be referred to as the sub-district, or be referred to as macrocell) Microcell of inner zone, the characteristics of this class Microcell are: only exist and with the interference between the adjacent Microcell in sub-district, and with the main RRU of adjacent sub-district, little as can not consider as the interference between RRU101B, the RRU101C; The second class Microcell is the Microcell that is in distributed base station overlay area (being referred to as the sub-district) border belt, as having the Microcell of shade among Fig. 1, the characteristics of this class Microcell are: both existed and with the interference between the adjacent Microcell in sub-district, also there is and belongs to interference between the adjacent Microcell of adjacent sub-district, also exist and adjacent sub-district, as the main RRU of 104B/104C, as the interference between RRU101B, the RRU101C.
The Inter-Cell Interference Coordination technology of available technology adopting can not be in the wireless access network that distributed base station constitutes, and realizes between the Microcell and the efficient use of frequency between the macrocell and between Microcell and the macrocell.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of frequency using method that is used for the wireless access network of distributed base station formation, can't realize the defective of the efficient use of wireless access network medium frequency that distributed base station constitutes with the channeling technology that solves the prior art use.
In order to address the above problem, the invention provides a kind of frequency using method that is used for the wireless access network of distributed base station formation, comprising:
A is divided into two sub-frequency bands to the working band of described wireless access network;
B is divided into N orthogonal sub-carriers group of non-overlapping copies to the sub-frequency bands in described two sub-frequency bands, and the main RF remote unit of each macrocell uses a group in described N the orthogonal sub-carriers group, and N is the number of described macrocell;
C is in subcarrier in the employed N-1 of the main RF remote unit orthogonal sub-carriers group of multiplexing remaining N-1 macrocell between the attached RF remote unit of macrocell inside and the subcarrier in another sub-band in described two sub-frequency bands.
Further, among the described step c, the subcarrier in the employed N-1 of the main RF remote unit orthogonal sub-carriers group of multiplexing remaining N-1 macrocell and the mode of the orthogonal sub-carriers in another sub-band in described two sub-frequency bands are any in the following mode: a M/frequency multiplexing mode, soft-frequency reuse mode or partial frequency multiplexing mode.
Further, among the described step b, the method that the sub-frequency bands in two sub-frequency bands is divided into N orthogonal sub-carriers group of non-overlapping copies is: all subcarriers in the arbitrary sub-frequency bands in described two sub-frequency bands are divided into the wide N of frequency bandwidth group.
In sum, the invention provides a kind of frequency using method that is used for the wireless access network of distributed base station formation, this method is in conjunction with the characteristics of distributed base station, under the situation that guarantees the low interference of each macrocell, realize between the Microcell, between the macrocell, and frequency ground efficiently uses between Microcell and the macrocell, and can improve the throughput of distributed base station.
Description of drawings
Fig. 1 is the layering wireless accessing network structure schematic diagram that distributed base station constitutes;
Fig. 2 is the flow chart of the inventive method.
Embodiment
Present embodiment provides a kind of frequency using method that is used for the double layered wireless access network that distributed base station constitutes, its concrete operations as shown in Figure 2:
Step 201: the working band B of the wireless access network of distributed base station composition is divided into F1 and F2 two sub-frequency bands;
Here the frequency bandwidth of F1 and F2 can be determined according to concrete networking situation, as long as satisfy the size that F1 and both frequency bandwidth sums of F2 equal working band B.
Step 202: the sub-frequency bands in two sub-frequency bands is divided into N orthogonal sub-carriers group of non-overlapping copies, as sub-band F1 being divided into N group of non-overlapping copies.Here N is the number of macrocell.The main RRU of each covering macrocell uses a group in N the orthogonal sub-carriers group, and the main RRU of remaining N-1 macrocell then uses the subcarrier of remaining N-1 orthogonal sub-carriers group.Here, the F1 group is that N the sub number of organizing the subcarrier of place group should be more than or equal to N.
Be divided into N group method can but be not limited to be: all subcarriers in the F1 are divided into the wide N of frequency bandwidth group, and promptly the number of sub carrier wave of each group is equal.
Step 203: be in subcarrier in the employed N-1 of the main RRU orthogonal sub-carriers group of multiplexing in some way remaining N-1 macrocell between the attached RRU of covering Microcell of macrocell inside and another sub-band and be the subcarrier in the F2.
Frequency multiplexing mode between the attached RRU of the Microcell of macrocell inside can be any in the following mode: M/frequency multiplexing mode, soft-frequency reuse mode or partial frequency multiplexing mode (fractional reuse).
M/frequency multiplexing mode can but be not limited to be, the frequency bandwidth that each attached RRU uses is: the frequency bandwidth of the working band B of this distributed base station deducts the frequency bandwidth of subcarrier of the employed orthogonal sub-carriers group of main RRU of this attached RRU place macrocell, and the difference of gained is again divided by M.
The span of M can but to be not limited to be 1 to 7 natural number.
Further specify the inventive method with an embodiment below:
With as shown in Figure 1 double layered wireless access network is that example describes, and the air interface of this system is worked in the OFDM mode, and has the working band B of 10MHz.This double layered wireless access network is made of 3 macrocells, and promptly N equals 3 here.
Step 301: two sub-frequency bands that working band B are divided into F1=3MHz and F2=7MHz;
Step 302: the subcarrier in the 3MHz in the F1 is divided into N=3 group of non-overlapping copies, and the bandwidth of each group is 3/3=1MHz.The main RRU 101A of each covering macrocell uses one group of subcarrier in 3 orthogonal sub-carriers groups, and the main RRU of remaining 2 macrocell uses the subcarrier in remaining N-1=2 the orthogonal sub-carriers group.
Step 303: be between the attached RRU of covering Microcell of macrocell inside subcarrier in 2 orthogonal sub-carriers groups (corresponding 2MHz bandwidth) of the main RRU of remaining 2 macrocell being used with M/frequency multiplexing mode and the subcarrier in the F2=7MHz group and realize multiplexing.Here M is taken as 3.
The frequency of 2 orthogonal sub-carriers groups that the main RRU of remaining 2 macrocell uses and be 2MHz adds F2=7MHz, is the 9MHz bandwidth altogether, and each attached RRU uses 3MHz behind 1/3rd channelings.
Claims (3)
1, a kind of frequency using method that is used for the wireless access network of distributed base station formation comprises:
A is divided into two sub-frequency bands to the working band of described wireless access network;
B is divided into N orthogonal sub-carriers group of non-overlapping copies to the sub-frequency bands in described two sub-frequency bands, and the main RF remote unit of each macrocell uses a group in described N the orthogonal sub-carriers group, and N is the number of described macrocell;
C is in subcarrier in the employed N-1 of the main RF remote unit orthogonal sub-carriers group of multiplexing remaining N-1 macrocell between the attached RF remote unit of macrocell inside and the subcarrier in another sub-band in described two sub-frequency bands.
2, the method for claim 1 is characterized in that:
Among the described step c, the subcarrier in the employed N-1 of the main RF remote unit orthogonal sub-carriers group of multiplexing remaining N-1 macrocell and the mode of the orthogonal sub-carriers in another sub-band in described two sub-frequency bands are any in the following mode: a M/frequency multiplexing mode, soft-frequency reuse mode or partial frequency multiplexing mode.
3, the method for claim 1 is characterized in that:
Among the described step b, the method that the sub-frequency bands in two sub-frequency bands is divided into N orthogonal sub-carriers group of non-overlapping copies is: all subcarriers in the arbitrary sub-frequency bands in described two sub-frequency bands are divided into the wide N of frequency bandwidth group.
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| CN2007101637657A CN101426211B (en) | 2007-10-30 | 2007-10-30 | Wireless access network frequency using method used for distributed base station constitution |
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| CN2007101637657A CN101426211B (en) | 2007-10-30 | 2007-10-30 | Wireless access network frequency using method used for distributed base station constitution |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917764A (en) * | 2010-08-12 | 2010-12-15 | 新邮通信设备有限公司 | Method and system for allocating frequency points |
| CN102149201A (en) * | 2010-02-09 | 2011-08-10 | 财团法人工业技术研究院 | Device and method of conducting resource allocation in wireless communication |
| CN103379647A (en) * | 2012-04-23 | 2013-10-30 | 普天信息技术研究院有限公司 | Method for adjusting cell carrier waves of heterogeneous network and heterogeneous network |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353803C (en) * | 2004-11-04 | 2007-12-05 | 华为技术有限公司 | Networking method for OFDMA system |
| ATE415796T1 (en) * | 2006-03-20 | 2008-12-15 | Alcatel Lucent | METHOD FOR ADDING USER TERMINALS TO SUB CARRIERS IN A MULTI-CELL OR MULTI-SECTOR COMMUNICATIONS NETWORK WITH FDM TRANSMISSION, A BASE STATION AND A NETWORK THEREOF |
| CN101056156B (en) * | 2006-04-14 | 2010-10-13 | 华为技术有限公司 | A channel quality feedback method and its user terminal and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149201A (en) * | 2010-02-09 | 2011-08-10 | 财团法人工业技术研究院 | Device and method of conducting resource allocation in wireless communication |
| CN102149201B (en) * | 2010-02-09 | 2015-01-28 | 财团法人工业技术研究院 | Device and method of conducting resource allocation in wireless communication |
| CN101917764A (en) * | 2010-08-12 | 2010-12-15 | 新邮通信设备有限公司 | Method and system for allocating frequency points |
| CN101917764B (en) * | 2010-08-12 | 2014-07-02 | 新邮通信设备有限公司 | Method and system for allocating frequency points |
| CN103379647A (en) * | 2012-04-23 | 2013-10-30 | 普天信息技术研究院有限公司 | Method for adjusting cell carrier waves of heterogeneous network and heterogeneous network |
| CN103379647B (en) * | 2012-04-23 | 2015-12-16 | 普天信息技术研究院有限公司 | A kind of cell carrier method of adjustment of heterogeneous network and heterogeneous network |
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