CN101312587B - Method for reducing co-channel interference of downlink - Google Patents
Method for reducing co-channel interference of downlink Download PDFInfo
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- CN101312587B CN101312587B CN2007101061483A CN200710106148A CN101312587B CN 101312587 B CN101312587 B CN 101312587B CN 2007101061483 A CN2007101061483 A CN 2007101061483A CN 200710106148 A CN200710106148 A CN 200710106148A CN 101312587 B CN101312587 B CN 101312587B
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Abstract
The invention discloses a method for reducing the co-frequency interference of a descending chain, comprising steps of: setting different sector serial numbers for different adjacent base stations; correcting the channel for the frequency of each base station and increasing redundancy for the mobile application part of the descending chain; adopting a special descending time division data block of each base station to transmit pilot signals and data information. The invention can effectively reduce the co-frequency interference of systems and can improve power without increasing co-frequency interference.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of method that reduces the down link co-channel interference.
Background technology
In recent years, OFDM (Orthogonal Frequency DivisionMultiplexing, abbreviation OFDM) technology is because the spectrum efficiency height, anti-multipath disturbs and becomes the main flow of radio communication physical-layer techniques, no matter be the follow-up evolution (for example LTE) of 3G or the WiMAX access technology of current popular (IEEE802.16 for example, IEEE802.20) all adopted OFDM to provide multiple access to insert as physical-layer techniques, just adopted OFDM access (Orthogonal Frequency Division MultipleAccess is called for short OFDMA) technology.
The WiMax system is exactly a kind of OFDMA system of the IEEE802.16e of support agreement, in the networking of this system, may run into some terminal not support sector divide 3 sections use patterns of subchannel (PUSC3Segment) to use the mode of parton carrier wave, can only support PUSC to use the situation of the mode of whole subcarriers, for ability and three sectors of support that adapt to terminal, base station side often will adopt the solution of interim similar omnidirectional sector, promptly all sends identical downstream signal by three sectors and reaches the purpose of supporting three sectors.
Adopting the shortcoming of this mode to be, will have serious co-channel interference between each base station, how effectively to reduce co-channel interference, is the problem that must consider in the system configuration.
Summary of the invention
One or more problems in view of the above the invention provides a kind of method that reduces the down link co-channel interference.
Method according to reduction down link co-channel interference of the present invention comprises: for the adjacent sectors of adjacent different base station is provided with different sector serial numbers; The frequency correction channel and the down link MAP that are respectively each base station increase redundant; And the specific downlink time division data area pilot signal transmitted and the data message that pass through each base station.
Wherein, by being carried out repeated encoding, frequency correction channel and down link MAP increase their redundancy.Method according to reduction down link co-channel interference of the present invention is applicable in the orthogonal frequency division multiple access system.Wherein, frequency correction channel and down link MAP adopt the orthogonal PSK mode to modulate.
Further, the method according to reduction down link co-channel interference of the present invention is applicable to the WiMax system that supports the IEEE802.16e agreement.Wherein, increase its redundancy by frequency correction channel being carried out 4 repeated encodings.And increase its redundancy by the down link MAP being carried out 6 repeated encodings.For equidirectional each base station section of antenna direction is provided with identical sector serial numbers.Especially, be specially adapted to terminal according to the method for reduction down link co-channel interference of the present invention and do not support part to use the sub-channelizing mode to use the mode of parton carrier wave, only support part to use the sub-channelizing mode to use under the condition of mode of whole subcarriers.
By the present invention, between the reduction system base-station, obtained tangible progress aspect the co-channel interference, do not support PUSC 3Segment to use the mode of parton carrier wave in terminal, can only support PUSC to use under the condition of mode of whole subcarriers, reduce the co-channel interference between system effectively, alleviated the contradiction between subjective bring to power and the objective increase co-channel interference significantly.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the method that is applied to the reduction down link co-channel interference in the WiMAX system of the embodiment of the invention;
Fig. 2 is the tactful schematic diagram for the base station assigns sector serial numbers of different districts according to the embodiment of the invention;
Fig. 3 be according to the embodiment of the invention for the tactful schematic diagram of base station configuration frequency correction channel;
Fig. 4 is the collocation strategy schematic diagram according to the descending DLMAP message of three base stations of a sub-district of the embodiment of the invention; And
Fig. 5 is the collocation strategy schematic diagram according to the downlink data of three base stations of a sub-district of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
With reference to figure 1, the method that is applied to the reduction down link co-channel interference in the WiMAX system according to the embodiment of the invention is described.As can be seen from Figure 1, the method that this reduces the down link co-channel interference comprises following components: for adjacent different base station is provided with different sector serial numbers; The frequency correction channel and the down link MAP that are respectively each base station increase redundant; And the specific downlink time division data area pilot signal transmitted and the data message that pass through each base station.Wherein, by being carried out repeated encoding, frequency correction channel and down link MAP increase their redundancy.
With reference to figure 2, the strategy for the base station assigns sector serial numbers of different districts according to the embodiment of the invention is described.As shown in Figure 2, when being provided with in system, for the base station (Base Transceiver Station is called for short BTS) of same sub-district, distribute different sector (Segment) sequence numbers, the adjacent S egment of different districts must use different Segment number.The preferred realization of one three sector is, the BTS of the equidirectional sensing of all antennas is configured to the same segment number.By being provided with to adjacent BTS different Segment number, can be implemented in and launch prefix sequence (Preamble) in the different subcarrier set and different BTS adopts the purpose of different prefix sequence, disturb thereby can eliminate prefix.
With reference to figure 3, illustrate to be the strategy of base station configuration frequency correction channel according to the embodiment of the invention.Wherein, frequency correction channel (Frequency Correction Channel is called for short FCH) adopts the modulation system of Quadrature Phase Shift Keying modulation (QPSK) 1/2.As shown in Figure 3, by FCH4 time is repeated to make FCH take 4 time slots (Slot) on 4 continuous logical sub-channel.And first Slot in the zone from the PUSC mode of this segment correspondence begins to distribute.
For the whole subcarrier modes of PUSC, adjacent BTS adopts different Segment number, the FCH physical location of different B TS is with difference, to there be interference between the FCH of adjacent BTS, but because the DLMAP employing is according to taking the mode that whole subchannels are arranged, so will there be interference in the FCH of adjacent BTS and down link MAP between (DownlinkMobile Application Part is called for short DLMAP).For the FCH that eliminates adjacent BTS and the interference between the DLMAP, need be configured DLMAP message.
With reference to figure 4, the collocation strategy according to the descending DLMAP message of three base stations of a sub-district of the embodiment of the invention is described.Wherein, DLMAP adopts the modulation system of QPSK1/2.As shown in Figure 4, DLMAP is carried out 6 times repeat, be the space (90 Slot) that DLMAP reserves 6 symbols (Symbol).These spaces will all be filled up 2～7 time-domain symbol through after filling.
With reference to figure 5, the collocation strategy according to the downlink data of three base stations of a sub-district of the embodiment of the invention is described.As shown in Figure 5, for three of a sub-district different BTS, the data segment follow-up at DLMAP carries out one-at-a-time operation, and each BTS only can send downlink data a period.For example, in Fig. 5, BTS1 carries out descending transmission in 8～15 time-domain symbol, and BTS2 carries out descending transmission in 16～23 time-domain symbol, and BTS3 carries out descending transmission in 24～31 time-domain symbol.
In the process of transmitting of data, pilot frequency sequence is a pseudo random sequence, its initialization vector is relevant with ID cell, segment sequence number and symbol biasing, by the present invention, the pilot frequency sequence difference that different B TS adopts is therefore, identical even the pilot frequency sequence of adjacent BTS sends the position, also can distinguish in the time of travelling carriage (Mobile Station is called for short MS) demodulation according to the difference of pilot frequency sequence.
In sum, the present invention has obtained tangible progress aspect the co-channel interference between the reduction system base-station, do not support PUSC3Segment to use the mode of parton carrier wave in terminal, can only support PUSC to use under the condition of mode of whole subcarriers, reduce the co-channel interference between system effectively, alleviated the contradiction between subjective bring to power and the objective increase co-channel interference significantly.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (8)
1. a method that reduces the down link co-channel interference is characterized in that, comprising:
For the adjacent sectors of adjacent different base station is provided with different sector serial numbers;
Being respectively the frequency correction channel of described each base station and down link MAP increases redundantly, wherein, increases their redundancy by described frequency correction channel and described down link MAP are carried out repeated encoding; And
Specific downlink time division data area pilot signal transmitted and data message by described each base station.
2. the method for reduction down link co-channel interference according to claim 1 is characterized in that described method is applied in the orthogonal frequency division multiple access system.
3. the method for reduction down link co-channel interference according to claim 2 is characterized in that, described frequency correction channel and described down link MAP adopt the orthogonal PSK mode to modulate.
4. the method for reduction down link co-channel interference according to claim 3 is characterized in that, described method is applied to support in the WiMax wireless network of IEEE802.16e agreement.
5. the method for reduction down link co-channel interference according to claim 4 is characterized in that, increases its redundancy by described frequency correction channel being carried out 4 repeated encodings.
6. the method for reduction down link co-channel interference according to claim 5 is characterized in that, increases its redundancy by described down link MAP being carried out 6 repeated encodings.
7. the method for reduction down link co-channel interference according to claim 6 is characterized in that, for equidirectional each base station section of antenna direction is provided with identical sector serial numbers.
8. the method for reduction down link co-channel interference according to claim 7, it is characterized in that, described method is applied to terminal and does not support part to use the sub-channelizing mode to use the mode of parton carrier wave, only supports part to use the sub-channelizing mode to use under the condition of mode of whole subcarriers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101061483A CN101312587B (en) | 2007-05-24 | 2007-05-24 | Method for reducing co-channel interference of downlink |
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| CN2007101061483A CN101312587B (en) | 2007-05-24 | 2007-05-24 | Method for reducing co-channel interference of downlink |
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| CN101312587A CN101312587A (en) | 2008-11-26 |
| CN101312587B true CN101312587B (en) | 2011-12-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961388B2 (en) * | 2001-02-01 | 2005-11-01 | Qualcomm, Incorporated | Coding scheme for a wireless communication system |
| CN1913695A (en) * | 2005-08-09 | 2007-02-14 | 大唐移动通信设备有限公司 | Method for reducing co-channel interference in sector interval |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961388B2 (en) * | 2001-02-01 | 2005-11-01 | Qualcomm, Incorporated | Coding scheme for a wireless communication system |
| CN1913695A (en) * | 2005-08-09 | 2007-02-14 | 大唐移动通信设备有限公司 | Method for reducing co-channel interference in sector interval |
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| CN101312587A (en) | 2008-11-26 |
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