CN104080174B - Cell reference signals interference processing method, system and the device of minizone - Google Patents
Cell reference signals interference processing method, system and the device of minizone Download PDFInfo
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Abstract
The invention discloses the CRS of minizone interference processing method, system and device：The DwPTS time slot configurations in the neighbor cell of CRS positions conflict, the special subframe that one of cell is used occur for any two in network for long DwPTS time slots, the DwPTS time slot configurations in the special subframe that another cell is used are short DwPTS time slots；Determine that occurring CRS positions with neighbor cell conflicts and be configured with satisfactory terminal in the terminal of the cell subordinate of long DwPTS time slots, it is described meet the requirements including：Positioned at affiliated subdistrict edge and close on and occur the neighbor cell that CRS positions conflict with affiliated subdistrict；DwPTS time slots in the special subframe that the terminal scheduling determined to affiliated subdistrict is used carry out data transmission.Using scheme of the present invention, it is possible to increase the descending performance of system.
Description
Technical Field
The present invention relates to wireless technologies, and in particular, to a method, a system, and an apparatus for processing inter-cell reference signal interference.
Background
In a Time Division Long Term Evolution (TD-LTE) system, a Cell-specific Reference Signal (CRS) is an important Reference Signal for a terminal to perform channel estimation, data demodulation, and the like.
For a two-antenna port system commonly adopted at present, under a configuration of a normal Cyclic Prefix (CP), CRSs are located on the 1 st, 5 th, 8 th and 12 th Orthogonal Frequency Division Multiplexing (OFDM) symbols of each 1ms subframe in a time domain (the number of the OFDM symbols starts from 1), and appear once in every 3 subcarriers in a Frequency domain, that is, there are 4 CRS positions in every 12 subcarriers.
For a terminal, if a CRS is interfered by a CRS of an adjacent cell, signal estimation and data reception performance of the terminal may be seriously affected, so that downlink performance of a system is degraded.
However, since the frequency domain density of the CRS in the TD-LTE system is high, the CRS positions of at most 3 cells may be staggered, and in a wireless network, especially a dense urban area, a phenomenon that 4 or more cells are adjacent to each other may easily occur, and at this time, the CRS positions of two cells may not be staggered, that is, CRS position collision occurs. As shown in fig. 1, fig. 1 is a schematic diagram illustrating CRS position collision among cells in the prior art, CRS positions of cell 2, cell 3 and cell 4 may be mutually staggered, but CRS positions of cell 1 and cell 2 cannot be staggered, so CRS position collision occurs, and CRS interference among cells is caused.
Therefore, the existing method still has defects, so that the downlink performance of the system is reduced.
Disclosure of Invention
In view of this, the present invention provides a method, a system, and a device for processing inter-cell reference signal interference, which can improve downlink performance of the system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for processing CRS interference among cells comprises the following steps:
aiming at any two adjacent cells in the network, wherein CRS position conflicts occur, a downlink pilot time slot (DwPTS) in a special subframe used by one cell is configured as a long DwPTS time slot, and a DwPTS time slot in a special subframe used by the other cell is configured as a short DwPTS time slot;
determining a terminal meeting requirements in terminals which collide with CRS positions of adjacent cells and belong to a cell configured with a long DwPTS time slot, wherein the meeting requirements comprise: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; and scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
An inter-cell CRS interference handling system, comprising:
a time slot configuration device, configured to configure a downlink pilot time slot DwPTS in a special subframe used by one cell as a long DwPTS time slot and configure a DwPTS time slot in a special subframe used by another cell as a short DwPTS time slot for any two adjacent cells in the network where CRS position conflicts occur;
a resource allocation device, configured to determine a terminal that meets requirements among terminals that collide with CRS positions of neighboring cells and belong to a cell configured with a long DwPTS, where the meeting requirements include: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; and scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
A timeslot configuring apparatus, comprising:
and the time slot configuration module is used for configuring a downlink pilot time slot DwPTS in a special subframe used by one cell into a long DwPTS time slot and configuring a DwPTS time slot in a special subframe used by the other cell into a short DwPTS time slot aiming at any two adjacent cells in which the positions of cell reference signals CRS conflict.
A resource allocation apparatus, comprising:
a determining module, configured to determine a terminal that meets requirements among terminals under a cell having a cell reference signal CRS position conflict with an adjacent cell and configured with a long downlink pilot time slot DwPTS, where the meeting requirements include: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; informing the determined terminal to a scheduling module;
and the scheduling module is used for scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
It can be seen that, by adopting the scheme of the present invention, long DwPTS time slots and short DwPTS time slots are respectively configured for two adjacent cells where CRS position collision occurs, and a terminal of an adjacent cell which is located at the edge of a cell and is close to where CRS position collision occurs among terminals under the cell configured with the long DwPTS time slots is scheduled to the long DwPTS time slot for data transmission, that is, a terminal which is seriously interfered by the CRS of the adjacent cell is scheduled to the long DwPTS time slot for data transmission, thereby reducing or even avoiding CRS interference, and further improving downlink performance of the system.
Drawings
Fig. 1 is a schematic diagram illustrating CRS position collision between cells in the prior art.
Fig. 2 is a flowchart of an embodiment of a CRS interference processing method between cells according to the present invention.
Fig. 3 is a schematic diagram of a special subframe used by two cells after configuration according to the method of the present invention.
Fig. 4 is a schematic diagram of a terminal that needs to be scheduled to a long DwPTS for data transmission according to the present invention.
Detailed Description
Aiming at the problems in the prior art, the invention provides a CRS interference processing scheme among cells, which can improve the downlink performance of a system.
In order to make the technical solution of the present invention clearer and more obvious, the solution of the present invention is further described in detail below by referring to the drawings and examples.
Fig. 2 is a flowchart of an embodiment of a CRS interference processing method between cells according to the present invention. As shown in fig. 2, the method comprises the following steps:
step 21: for any two adjacent cells in the network where CRS position collision occurs, a Downlink Pilot Time Slot (DwPTS) in a special subframe used by one cell is configured as a long DwPTS Slot, and a DwPTS Slot in a special subframe used by the other cell is configured as a short DwPTS Slot.
In a TD-LTE system, each 10ms radio frame has 1-2 1ms special subframes, and each special subframe is composed of a DwPTS (time Slot), a Guard Period (GP) time Slot, and an Uplink pilot time Slot (UpPTS, Uplink pilot time Slot).
The DwPTS is used for transmission of downlink control signals and data signals, the GP is a protection time slot for uplink and downlink transmission, and there is no signal transmission, and the UpPTS is used for transmission of uplink Sounding Reference Signals (SRS) and random access signals.
Under normal CP configuration, the TD-LTE standard specifies 9 special subframe configurations, each of which corresponds to a combination of the number of OFDM symbols occupied by each special timeslot, as shown in table one.
Table-special subframe configuration under normal CP configuration
When the DwPTS occupies 9, 10, 11 or 12 OFDM symbols, the DwPTS may be used for transmitting a control signal or a data signal, and is called a long DwPTS; when the DwPTS slot occupies 3 OFDM symbols, only the control signal can be transmitted and the data signal cannot be transmitted, which is called a short DwPTS slot.
In this step, for two adjacent cells with CRS position collision, the DwPTS in the special subframe used by one cell is configured as a long DwPTS, and the DwPTS in the special subframe used by the other cell is configured as a short DwPTS.
For the cell which does not conflict with the adjacent cell in CRS position in the network, the DwPTS time slot in the special subframe used by the cell can be configured as the long DwPTS time slot, so as to improve the downlink performance of the system.
In addition, the number of OFDM symbols occupied by the UpPTS timeslot in the special subframe used by each cell in the network may be configured to be the same, for example, 1 or 2.
In practical application, the step can be realized in a manual auxiliary mode or an automatic mode.
The manual assistance means that the CRS positions of the cells in the network are manually analyzed, and the long and short DwPTS time slots of different cells are configured according to the analysis result.
The automatic mode does not need manual participation, and for any cell, whether the cell conflicts with the adjacent cell in the CRS position can be determined according to the automatic adjacent cell relation discovery function, if so, the identification of the adjacent cell which conflicts with the CRS position of the cell is obtained, the obtained identification is compared with the identification of the cell, if the identification of the cell is larger, the DwPTS time slot in the special subframe used by the cell is configured as the long DwPTS time slot, otherwise, the DwPTS time slot in the special subframe used by the cell is configured as the short DwPTS time slot.
Step 22: determining a terminal meeting requirements in terminals which collide with CRS positions of adjacent cells and belong to a cell configured with a long DwPTS time slot, wherein the meeting requirements comprise: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; and scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
If CRS position conflicts occur between a cell and an adjacent cell and a long DwPTS is configured, in this step, a terminal meeting requirements among terminals under the cell, that is, a terminal located at the edge of the cell and close to the adjacent cell where CRS position conflicts occur with the cell, may be determined first, and then the determined terminal may be scheduled to the DwPTS in the special subframe used by the cell for data transmission.
Determining whether a terminal is satisfactory may be performed in the following manner: acquiring Reference Signal Received Power (RSRP) values of adjacent cells which are measured and reported by the terminal and conflict with CRS positions of the cells, determining whether absolute values of differences between the acquired RSRP values and the RSRP values of the cells to which the terminal belongs are located in an interval { a, b }, and if so, determining that the terminal is a terminal meeting requirements; wherein a and b are both greater than or equal to 0, and b is greater than a. The specific values of a and b can be determined according to actual needs, and preferably, a =0dB and b =3 dB.
The following will further describe steps 21 to 22 with reference to the accompanying drawings.
Fig. 3 is a schematic diagram of a special subframe used by two cells after configuration according to the method of the present invention. As shown in fig. 3, a short DwPTS slot is configured for cell 1, 3 OFDM symbols are occupied, a long DwPTS slot is configured for cell 2, 10 OFDM symbols are occupied, and UpPTS slots configured for cell 1 and cell 2 both occupy 2 OFDM symbols; it can be seen that, cell 1 does not have any signal transmission on downlink 4 th to 12 th symbols, including CRS, cell 2 can perform transmission of data signals and CRS on downlink 4 th to 10 th OFDM symbols, and when CRS positions of cell 1 and cell 2 collide as shown in fig. 1, cell 2 is not interfered by CRS of cell 1 in the time slot indicated in fig. 3.
Fig. 4 is a schematic diagram of a terminal that needs to be scheduled to a long DwPTS for data transmission according to the present invention. As shown in fig. 4, assuming that CRS positions of cell 2, cell 3, and cell 4 are staggered, that is, CRS positions do not collide, and there is no CRS interference between them, and CRS positions of cell 1 and cell 2 cannot be staggered, terminal 1 is located at the edge of cell 2 and is close to cell 1, and in order to avoid CRS interference of cell 1, it is necessary to schedule terminal 1 to perform data transmission through long DwPTS in the special subframe used by cell 2.
This completes the description of the method embodiment of the present invention.
Based on the introduction, the invention also discloses a CRS interference processing system among the cells, a time slot configuration device and a resource allocation device.
The system comprises:
the time slot configuration device is used for configuring a DwPTS time slot in a special subframe used by one cell as a long DwPTS time slot and configuring a DwPTS time slot in a special subframe used by the other cell as a short DwPTS time slot aiming at any two adjacent cells in which CRS position conflicts occur in a network;
a resource allocation device, configured to determine a terminal that meets requirements among terminals that collide with CRS positions of neighboring cells and belong to a cell configured with a long DwPTS, where the meeting requirements include: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; and scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
The time slot configuration device comprises:
and the time slot configuration module is used for configuring the DwPTS time slot in the special subframe used by one cell as a long DwPTS time slot and configuring the DwPTS time slot in the special subframe used by the other cell as a short DwPTS time slot aiming at any two adjacent cells in the network with CRS position conflict.
The timeslot configuration module may further specifically include:
a first processing unit, configured to acquire a CRS location analysis result of each cell in a network, where the CRS location analysis result of each cell includes: whether CRS position conflict occurs between the cell and the adjacent cell and the DwPTS time slot type required to be configured by the cell;
for any two adjacent cells with CRS position conflict, the type required to be configured by the DwPTS time slot in the special subframe used by one cell is a long DwPTS time slot, and the type required to be configured by the DwPTS time slot in the special subframe used by the other cell is a short DwPTS time slot;
finishing the time slot configuration of the cell according to the analysis result;
or,
a second processing unit, configured to perform the following processing for each cell in the network: according to the automatic neighbor relation discovery function, whether the cell conflicts with the adjacent cell in the CRS position is determined, if yes, the identification of the adjacent cell which conflicts with the CRS position of the cell is obtained, the obtained identification is compared with the identification of the cell, if the identification of the cell is larger, the DwPTS time slot in the special subframe used by the cell is configured to be a long DwPTS time slot, otherwise, the DwPTS time slot in the special subframe used by the cell is configured to be a short DwPTS time slot.
The first processing unit and the second processing unit may further be configured to configure the number of OFDM symbols occupied by the UpPTS time slot in the special subframe used by each cell in the network to be the same.
Preferably, the first and second liquid crystal films are made of a polymer,
the number of OFDM symbols occupied by the long DwPTS time slot is as follows: 9. 10, 11 or 12;
the number of OFDM symbols occupied by the short DwPTS time slot is as follows: 3;
the number of OFDM symbols occupied by the UpPTS time slot is as follows: 1 or 2.
The resource allocation device comprises:
a determining module, configured to determine a terminal that meets requirements among terminals that collide with CRS positions of neighboring cells and belong to a cell configured with a long DwPTS, where the meeting requirements include: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; informing the determined terminal to a scheduling module;
and the scheduling module is used for scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
In particular, the amount of the solvent to be used,
the determining module respectively performs the following processing for each terminal under the cell which generates CRS position conflict with the adjacent cell and is configured with the long DwPTS time slot: acquiring a Reference Signal Received Power (RSRP) value of an adjacent cell which is measured and reported by the terminal and has CRS position conflict with a cell to which the terminal belongs, determining whether an absolute value of a difference between the acquired RSRP value and the RSRP value of the cell to which the terminal belongs is located in an interval { a, b }, and if so, determining that the terminal is a terminal meeting requirements; wherein a and b are both greater than or equal to 0, and b is greater than a.
In practical applications, where the timeslot configuration device and the resource allocation device are specifically deployed in the network may be determined according to actual needs, for example, the timeslot configuration device may be located in an Operation and Maintenance Center (OMC), and the resource allocation device may be located in a base station. The time slot configuration device can execute its own function after the network planning and deployment are completed, and the time slot configuration device can repeatedly execute its own function periodically or in an event, considering that the network condition may change, such as cell increase or decrease. Similarly, considering that the location of the terminal may move, the resource allocation apparatus may also repeatedly perform its own function periodically or in an event, and the specific implementation is well known in the art and will not be described again.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for processing inter-Cell Reference Signal (CRS) interference, comprising:
for any two adjacent cells in the network with CRS position conflict, configuring a downlink pilot time slot (DwPTS) in a special subframe used by one cell as a long DwPTS time slot, and configuring a DwPTS time slot in a special subframe used by the other cell as a short DwPTS time slot; wherein, the number of OFDM symbols occupied by the long DwPTS time slot is: 9. 10, 11 or 12; the number of OFDM symbols occupied by the short DwPTS time slot is as follows: 3;
determining a terminal meeting requirements in terminals which collide with CRS positions of adjacent cells and belong to a cell configured with a long DwPTS time slot, wherein the meeting requirements comprise: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; and scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
2. The method of claim 1,
the method further comprises the following steps: and for a cell which does not conflict with the adjacent cell in CRS position in the network, configuring the DwPTS time slot in the special subframe used by the cell as a long DwPTS time slot.
3. The method of claim 2,
the method further comprises the following steps: and configuring the number of OFDM symbols occupied by UpPTS in the special sub-frame used by each cell in the network to be the same.
4. The method of claim 3,
the number of OFDM symbols occupied by the UpPTS time slot is as follows: 1 or 2.
5. A method according to claim 1, 2 or 3, wherein said determining a satisfactory terminal comprises:
aiming at each terminal which has CRS position conflict with adjacent cells and belongs to the cell with the long DwPTS time slot, the following processing is respectively carried out:
acquiring a Reference Signal Received Power (RSRP) value of an adjacent cell which is measured and reported by the terminal and has CRS position conflict with a cell to which the terminal belongs, determining whether an absolute value of a difference between the acquired RSRP value and the RSRP value of the cell to which the terminal belongs is located in an interval { a, b }, and if so, determining that the terminal is a terminal meeting requirements; wherein a and b are both greater than or equal to 0, and b is greater than a.
6. An inter-Cell Reference Signal (CRS) interference handling system, comprising:
a time slot configuration device, configured to configure a downlink pilot time slot DwPTS in a special subframe used by one cell as a long DwPTS time slot and configure a DwPTS time slot in a special subframe used by another cell as a short DwPTS time slot for any two adjacent cells in the network where CRS position conflicts occur; wherein, the number of OFDM symbols occupied by the long DwPTS time slot is: 9. 10, 11 or 12; the number of OFDM symbols occupied by the short DwPTS time slot is as follows: 3;
a resource allocation device, configured to determine a terminal that meets requirements among terminals that collide with CRS positions of neighboring cells and belong to a cell configured with a long DwPTS, where the meeting requirements include: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; and scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
7. A timeslot configuring apparatus, comprising:
a time slot configuration module, configured to configure a downlink pilot time slot DwPTS in a special subframe used by one cell as a long DwPTS time slot and configure a DwPTS time slot in a special subframe used by another cell as a short DwPTS time slot for any two adjacent cells in the network where cell reference signal CRS position conflicts occur;
wherein, the number of OFDM symbols occupied by the long DwPTS time slot is: 9. 10, 11 or 12; the number of OFDM symbols occupied by the short DwPTS time slot is as follows: 3.
8. the apparatus of claim 7, wherein the timeslot configuration module comprises:
a first processing unit, configured to acquire a CRS location analysis result of each cell in a network, where the CRS location analysis result of each cell includes: whether CRS position conflict occurs between the cell and the adjacent cell and the DwPTS time slot type required to be configured by the cell;
for any two adjacent cells with CRS position conflict, the type required to be configured by the DwPTS time slot in the special subframe used by one cell is a long DwPTS time slot, and the type required to be configured by the DwPTS time slot in the special subframe used by the other cell is a short DwPTS time slot;
finishing the time slot configuration of the cell according to the analysis result;
or,
a second processing unit, configured to perform the following processing for each cell in the network: according to the automatic neighbor relation discovery function, whether the cell conflicts with the adjacent cell in the CRS position is determined, if yes, the identification of the adjacent cell which conflicts with the CRS position of the cell is obtained, the obtained identification is compared with the identification of the cell, if the identification of the cell is larger, the DwPTS time slot in the special subframe used by the cell is configured to be a long DwPTS time slot, and if not, the DwPTS time slot in the special subframe used by the cell is configured to be a short DwPTS time slot.
9. The apparatus of claim 8,
the first processing unit and the second processing unit are further configured to configure the number of OFDM symbols occupied by the UpPTS in the special subframe used by each cell in the network to be the same.
10. The apparatus of claim 9,
the number of OFDM symbols occupied by the UpPTS time slot is as follows: 1 or 2.
11. A resource allocation apparatus, comprising:
a determining module, configured to determine a terminal that meets requirements among terminals under a cell having a cell reference signal CRS position conflict with an adjacent cell and configured with a long downlink pilot time slot DwPTS, where the meeting requirements include: the adjacent cell is positioned at the edge of the cell and is close to the adjacent cell which generates CRS position conflict with the cell; informing the determined terminal to a scheduling module;
for any two adjacent cells in the network where CRS position conflict occurs, configuring a downlink pilot time slot (DwPTS) in a special subframe used by one cell as a long DwPTS time slot, and configuring a DwPTS time slot in a special subframe used by the other cell as a short DwPTS time slot; the number of OFDM symbols occupied by the long DwPTS time slot is as follows: 9. 10, 11 or 12; the number of OFDM symbols occupied by the short DwPTS time slot is as follows: 3;
and the scheduling module is used for scheduling the determined terminal to a DwPTS time slot in a special subframe used by the cell to which the terminal belongs for data transmission.
12. The apparatus of claim 11,
the determining module performs the following processing for each terminal under the cell which has the position conflict of CRS with the adjacent cell and is configured with the long DwPTS time slot: acquiring a Reference Signal Received Power (RSRP) value of an adjacent cell which is measured and reported by the terminal and has CRS position conflict with a cell to which the terminal belongs, determining whether an absolute value of a difference between the acquired RSRP value and the RSRP value of the cell to which the terminal belongs is located in an interval { a, b }, and if so, determining that the terminal is a terminal meeting requirements; wherein a and b are both greater than or equal to 0, and b is greater than a.
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| CN101286792A (en) * | 2007-04-11 | 2008-10-15 | 北京三星通信技术研究有限公司 | Device and method for intensifying synchronous HARQ |
| CN101425844A (en) * | 2007-11-02 | 2009-05-06 | 大唐移动通信设备有限公司 | Data transmission method and apparatus for time division duplexing system |
| CN101795473A (en) * | 2009-02-03 | 2010-08-04 | 大唐移动通信设备有限公司 | Methods and devices for determining special subframe configuration mode and time-domain resource use mode |
| CN102448122A (en) * | 2011-12-30 | 2012-05-09 | 中兴通讯股份有限公司 | Method and base station for confirming size of transmission block in sub-frame |
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| CN101286792A (en) * | 2007-04-11 | 2008-10-15 | 北京三星通信技术研究有限公司 | Device and method for intensifying synchronous HARQ |
| CN101425844A (en) * | 2007-11-02 | 2009-05-06 | 大唐移动通信设备有限公司 | Data transmission method and apparatus for time division duplexing system |
| CN101795473A (en) * | 2009-02-03 | 2010-08-04 | 大唐移动通信设备有限公司 | Methods and devices for determining special subframe configuration mode and time-domain resource use mode |
| CN102448122A (en) * | 2011-12-30 | 2012-05-09 | 中兴通讯股份有限公司 | Method and base station for confirming size of transmission block in sub-frame |
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