CN107483162B - Terminal-specific pilot scheduling method and device - Google Patents
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Abstract
The application provides a terminal-specific pilot frequency scheduling method and a terminal-specific pilot frequency scheduling device, wherein the method comprises the following steps: when the base station configures the terminal-specific pilot frequency of 2 symbols, the positions of the symbols added with the pilot frequency units are respectively on the 3 rd symbol, the 9 th symbol and the 11 th symbol aiming at the port 7 and the port 8, and the positions of the sub-carriers added with the pilot frequency units at the port 7 and the port 8 are not adjacent; aiming at a port 9 and a port 10, the positions of the symbols added with pilot frequency units are respectively on a 4 th symbol, a 10 th symbol and a 12 th symbol, and the positions of the added pilot frequency sub-carriers of the port 9 and the port 10 are not adjacent; when transmitting data to the terminal, scheduling is carried out according to the locally configured 2-symbol terminal-specific pilot frequency, so that the terminal demodulates the received data transmitted by the base station according to the locally configured 2-symbol terminal-specific pilot frequency. The scheme can reduce average air interface time delay and effectively reduce the detection complexity of the terminal during data demodulation.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for scheduling a pilot dedicated to a terminal.
Background
With the widespread commercialization of LTE, wireless data services have also exhibited explosive growth. While data traffic growth is fast, supporting more traffic types also presents challenges to the current LTE networks. These challenges are also growing to be the main direction of LTE network evolution.
One important direction is the shortening of the delay. For radio transmission, the length of a basic scheduling unit (TTI) of the current LTE is 1ms, and the average delay of one-time data transmission is about 10 ms. According to the latest ITU requirements for future networks, unidirectional data traffic is to meet an average transmission delay of 1 ms.
In order to better improve user experience and meet the requirement of network evolution as much as possible, LTE will also gradually support shorter TTIs, and when the TTI of 1ms (14 symbols) is reduced to 2 symbols, a scheduling mode of terminal (UE) dedicated pilot is not given in the existing implementation.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for scheduling a pilot dedicated to a terminal, which can reduce an average air interface delay and effectively reduce a detection complexity of the terminal during data demodulation.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a terminal-specific pilot scheduling method is applied to terminal-specific pilot scheduling of 2 symbols, and comprises the following steps:
when the base station configures the terminal-specific pilot frequency of 2 symbols, aiming at a port 7 and a port 8, the symbol positions of the added pilot frequency units are respectively on a 3 rd symbol, a 9 th symbol and an 11 th symbol, the subcarrier positions of the added pilot frequency units of the port 7 are not adjacent, and the subcarrier positions of the added pilot frequency units of the port 8 are not adjacent; aiming at a port 9 and a port 10, the positions of the symbols added with pilot frequency units are respectively on a 4 th symbol, a 10 th symbol and a 12 th symbol, the positions of the sub-carriers added with the pilot frequency units by the port 9 are not adjacent, and the positions of the sub-carriers added with the pilot frequency by the port 10 are not adjacent; the positions of the port 7, the port 9 and the port 10 for adding the pilot frequency units are different, and the positions of the port 8, the port 9 and the port 10 for adding the pilot frequency units are different;
when data is transmitted to a terminal, scheduling is carried out according to the locally configured 2-symbol terminal-specific pilot frequency, so that the terminal demodulates the received data transmitted by the base station according to the locally configured 2-symbol terminal-specific pilot frequency, wherein the 2-symbol terminal-specific pilot frequency configured by the terminal is the same as the 2-symbol terminal-specific pilot frequency configured by the base station.
A terminal-specific pilot scheduling apparatus applied to a base station for 2-symbol terminal-specific pilot scheduling, the apparatus comprising: a configuration unit and a transmission unit;
the configuration unit is configured to, when configuring the terminal-specific pilot of the 2-symbol, add the symbol positions of the pilot unit to the port 7 and the port 8 as a 3 rd symbol, a 9 th symbol, and an 11 th symbol, respectively, where the positions of the subcarriers of the port 7 to which the pilot unit is added are not adjacent, and the positions of the subcarriers of the port 8 to which the pilot unit is added are not adjacent; aiming at a port 9 and a port 10, the positions of the symbols added with pilot frequency units are respectively on a 4 th symbol, a 10 th symbol and a 12 th symbol, the positions of the sub-carriers added with the pilot frequency units by the port 9 are not adjacent, and the positions of the sub-carriers added with the pilot frequency by the port 10 are not adjacent; the positions of the port 7, the port 9 and the port 10 for adding the pilot frequency units are different, and the positions of the port 8, the port 9 and the port 10 for adding the pilot frequency units are different;
the sending unit is configured to schedule the terminal-specific pilot frequency of the 2 symbols configured locally by the configuration unit when sending data to the terminal, so that the terminal demodulates the received data sent by the base station according to the locally configured 2-symbol-terminal-specific pilot frequency, where the terminal-specific pilot frequency of the 2 symbols configured by the terminal is the same as the terminal-specific pilot frequency of the 2 symbols configured by the base station.
As can be seen from the above technical solutions, in the present application, 2-symbol UE-specific pilot scheduling can be supported by 2-symbol UE-specific pilots configured on a base station and a terminal. The realization of the scheme can reduce the average air interface time delay and effectively reduce the detection complexity of the terminal during data demodulation.
Drawings
Fig. 1 is a schematic diagram of a pilot structure for a port 7 in a conventional implementation;
fig. 2 is a schematic diagram of a pilot structure for port 8 in a conventional implementation;
fig. 3 is a schematic diagram of a pilot structure for port 9 in a conventional implementation;
fig. 4 is a schematic diagram of a pilot structure for a port 10 in a conventional implementation;
fig. 5 is a schematic diagram of a terminal-specific pilot structure when the basic scheduling unit for port 7 is 2 symbols;
fig. 6 is a schematic diagram of a terminal-specific pilot scheduling process in an embodiment of the present application;
fig. 7 is a schematic structural diagram of adding a pilot unit to a pilot structure of port 7 according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of adding a pilot unit to a pilot structure of port 8 according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of adding a pilot unit to a pilot structure of a port 9 according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of adding pilot units to a pilot structure of a port 10 according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The existing LTE protocol supports UE-specific pilot ports: port 7, port 8, port 9 and port 10. One Resource Block (RB) of LTE consists of 144 basic Resource Elements (REs), 14 symbols in the time domain, and 12 symbols in the frequency domain.
The time length of the existing scheduling unit of the LTE is 1ms, and 14 symbols exist in 1 ms.
Referring to fig. 1, fig. 1 is a schematic diagram of a pilot structure for a port 7 in a conventional implementation. In FIG. 1, the pilot distribution of port 7 is represented by R7And the pilot unit is represented.
Referring to fig. 2, fig. 2 is a schematic diagram of a pilot structure for port 8 in a conventional implementation. In fig. 2, the pilot distribution of port 8 is represented by R8And the pilot unit is represented.
Referring to fig. 3, fig. 3 is a schematic diagram of a pilot structure for port 9 in a conventional implementation. In FIG. 3, the pilot distribution of port 9 is represented by R9And the pilot unit is represented.
Referring to fig. 4, fig. 4 is a schematic diagram of a pilot structure for a port 10 in a conventional implementation. In fig. 4, the pilot distribution of port 10 is represented by R10And the pilot unit is represented.
When the basic scheduling unit is changed from 1ms to 2 symbols, the R7 port is taken as an example. Referring to fig. 5, fig. 5 is a schematic diagram of a terminal-specific pilot structure when the basic scheduling unit for port 7 is 2 symbols. It can be seen from fig. 5 that no pilots will be present within sTT11, sTTI2, sTTI5 and sTTI 6. For sTTI1, no UE-specific pilots may be present due to the need to transmit common control information, but for sTTI2, sTTI5, and sTTI6, no pilot distribution will make data for each port in these several scheduling units non-demodulatable.
In the embodiment of the application, by adding the pilot, each shortened basic scheduling unit (sTTI) except the sTTI1 has the pilot, thereby ensuring the demodulation performance.
How to configure UE-specific pilots and how to transmit data in the present application are described in detail below with reference to specific embodiments.
In the specific implementation of the present application, the UE-specific pilot with 2 symbols may be configured on the base station and the terminal communicating with the base station, or may be configured on the base station and then notified to the terminal communicating with the base station. In the following, the base station and the terminal are configured as an example, in short, the same UE-specific pilot structure is stored in the base station and the terminal communicating with the base station, and the terminal can demodulate normally when the base station transmits data to the terminal.
Referring to fig. 6, fig. 6 is a schematic diagram of a terminal-specific pilot scheduling process in the embodiment of the present application. The method comprises the following specific steps:
When the TTI of 2 symbol length is used and pilot cells are added, more pilot cells may be added to ensure demodulation performance to a certain extent, but the overhead caused by the pilot cells themselves will also reduce the resource utilization efficiency. In view of the fact that the existing pilot density is already very high, the pilot structure is configured, when the pilot is added, the pilot units are added as few as possible, and therefore, 3 pilot units are added on the 3 rd symbol (symbol 3) and the 9 th symbol (symbol 9) for the port 7 and the port 8; on the 11 th symbol (symbol 11), 2 or 3 pilot cells are added.
Referring to fig. 7, fig. 7 is a schematic structural diagram of adding a pilot unit to a pilot structure of port 7 according to an embodiment of the present application. The pilot addition positions are at the 3 rd symbol, the 9 th symbol and the 11 th symbol in fig. 7.
In symbol 3, 3 pilot cells are added, symbol 9 is added with 3 pilot cells, and symbol 11 is added with 2 pilot cells, and here, 2 symbols are taken as an example, 3 pilot cells may also be added.
The 3 pilot units added in the symbol 3 are not adjacent in the symbol 3, that is, the 3 pilot units are not added to the adjacent carriers at the carrier positions, and the more preferable addition manner is to uniformly distribute the positions added to the carriers as much as possible, for example, the positions of the three carriers in fig. 7 are the 3 rd subcarrier, the 8 th subcarrier and the 12 th subcarrier.
The 3 pilot cells added in the symbol 9 are not adjacent in the symbol 9, that is, the 3 pilot cells are not added to the adjacent carrier at the carrier position, and the more preferable addition mode is that the positions added to the carrier are distributed as uniformly as possible. The carrier positions corresponding to the 3 pilot cells added in the symbol 9 in fig. 7 are: the 3 rd subcarrier, the 8 th subcarrier, the 12 th subcarrier.
Adding 2 pilot units in the symbol 11, and not adding them to adjacent subcarriers at the symbol 11, that is, at carrier positions, the more preferable adding manner is to distribute the positions added to the carriers as uniformly as possible, for example, in fig. 7, the carrier positions corresponding to the 2 pilot units added in the symbol 11 are: the 4 th subcarrier, the 10 th subcarrier.
Referring to fig. 8, fig. 8 is a schematic structural diagram of adding a pilot unit to a pilot structure of port 8 according to an embodiment of the present application. The positions of the pilot units added to the ports 8 and 7 may be the same or different, in this embodiment of the application, the positions of the pilot units added to the ports 8 and 7 are the same as an example, and a specific addition manner is shown in fig. 8.
Similar to ports 7 and 8, when adding pilots, to improve resource utilization efficiency, pilot cells are added as few as possible, and therefore, for ports 9 and 10, 3 pilot cells are added to the 4 th symbol and the 10 th symbol, and 2 or 3 pilot cells are added to the 12 th symbol.
The positions of the port 7 and the port 9 and the port 10 for adding the pilot frequency units are different, the positions of the port 8 and the port 9 and the port 10 for adding the pilot frequency units are different, the positions of the port 7 and the port 8 for adding the pilot frequency units are the same or different, and the positions of the port 9 and the port 10 for adding the pilot frequency units are the same or different.
That is, in a specific implementation, the positions of the pilot units added to the ports 7 and 8 may be the same or different; the positions of the pilot frequency units added on the port 9 and the port 10 can be the same or different; however, the position of port 7 to add pilot cells and the position of port 8 to add pilot cells cannot be the same as the positions of port 9 and port 10 to add pilot cells.
Referring to fig. 9, fig. 9 is a schematic structural diagram of adding a pilot unit to a pilot structure of a port 9 according to an embodiment of the present application. The symbol positions of the pilot-added cells in fig. 9 are the 4 th symbol, the 10 th symbol and the 12 th symbol.
In the example of 2 symbols, 3 pilot cells are added to the symbol 4, 3 pilot cells are added to the symbol 10, and 2 pilots are added to the symbol 12, and 3 pilot cells may be added.
The 3 pilot cells added in the symbol 4 are not adjacent in the symbol 4, that is, are not added to adjacent carriers at the carrier positions, and a more preferable way is to uniformly distribute the positions added to the carriers as much as possible, such as the 3 pilot cells added in fig. 9 are respectively the 3 rd subcarrier, the 8 th subcarrier and the 12 th subcarrier at the carrier positions.
The 3 pilot cells added in the symbol 10 are not adjacent in the symbol 10, that is, the 3 pilot cells are not added in the adjacent carrier at the carrier position, and the more preferable addition manner is to distribute the positions added in the carrier uniformly as much as possible, for example, the 3 pilot cells added in fig. 9 are respectively the 3 rd subcarrier, the 8 th subcarrier and the 12 th subcarrier at the carrier position.
The 2 pilots added in the symbol 12 are distributed as uniformly as possible in the symbol 12, for example, 4 th row/subcarrier, 10 th row/subcarrier
The 2 pilot cells added in the symbol 12 are not adjacent in the symbol 12, that is, are not added to adjacent carriers at the carrier positions, and it is more preferable that the positions added to the carriers are distributed as uniformly as possible, as shown in fig. 9 that the 2 pilot cells added are respectively the 4 th subcarrier and the 10 th subcarrier at the carrier positions.
Referring to fig. 10, fig. 10 is a schematic structural diagram of adding a pilot unit to a pilot structure of a port 10 according to an embodiment of the present application. The positions of the pilot units added to the ports 9 and 10 may be the same or different, in this embodiment of the application, the positions of the pilot units added to the ports 10 and 9 are the same as an example, and a specific manner of adding the pilot units to the ports 10 is shown in fig. 10.
In the pilot unit adding modes of 4 ports shown in fig. 7 to fig. 10, the pilot unit adding modes of the port 7 and the port 8 are the same, the pilot unit adding modes of the port 9 and the port 10 are the same, and the positions of the port 7 and the port 8 which do not overlap with the pilot unit adding modes of the port 9 and the port 10, that is, the positions of the pilot unit adding modes are different.
Fig. 7 to fig. 10 only show one implementation of adding pilot units for 4 ports, and in particular, the implementation is not limited to this implementation.
The base station uses the structure of the configured 2-symbol UE-specific pilot to schedule data to be transmitted, and the terminal uses the structure of the configured 2-symbol UE-specific pilot to demodulate.
By the pilot adding method provided by the embodiment of the application, after pilot addition is performed, the sTTI2, the sTTI5, and the sTTI6 all have pilot distribution. The pilot distributions of the sTTI2, 3, 4, 5 are 3 within 2 symbols, the number of pilots within 2 symbols in the sTTI6 is 2 or 3, and the number of pilots within 2 symbols in the sTTI7 is 6. Considering that the single RB pilot frequency in 2 symbols is limited, the single RB pilot frequency in each sTTI is limited, the data unit in each sTTI is limited, and certain limitation is needed for the minimum scheduling RB of each sTTI, therefore, when the base station schedules the terminal special pilot frequency, the base station schedules not less than the preset value of RBs for 2 symbols of one sTTI.
The preset value can be configured according to practical application, such as 10, 20, etc.
Based on the same inventive concept, the specific embodiment of the present application further provides a terminal-specific pilot scheduling apparatus. Referring to fig. 11, fig. 11 is a schematic structural diagram of an apparatus applied to the above technology in the embodiment of the present application. The device includes: a configuration unit 1101 and a transmission unit 1102;
a configuration unit 1101, configured to, when configuring terminal-specific pilots of 2 symbols, for a port 7 and a port 8, add pilot units at symbol positions that are respectively on a 3 rd symbol, a 9 th symbol, and an 11 th symbol, where the positions of subcarriers for adding pilot units at the port 7 are not adjacent, and the positions of subcarriers for adding pilot units at the port 8 are not adjacent; aiming at a port 9 and a port 10, the positions of the symbols added with pilot frequency units are respectively on a 4 th symbol, a 10 th symbol and a 12 th symbol, the positions of the sub-carriers added with the pilot frequency units by the port 9 are not adjacent, and the positions of the sub-carriers added with the pilot frequency by the port 10 are not adjacent; the positions of the port 7, the port 9 and the port 10 for adding the pilot frequency units are different, and the positions of the port 8, the port 9 and the port 10 for adding the pilot frequency units are different;
a sending unit 1102, configured to schedule according to the 2-symbol terminal-specific pilot configured locally by the configuration unit 1101 when sending data to a terminal, so that the terminal demodulates the received data sent by the base station according to the locally configured 2-symbol terminal-specific pilot, where the 2-symbol terminal-specific pilot configured by the terminal is the same as the 2-symbol terminal-specific pilot configured by the base station.
Preferably, the first and second liquid crystal films are made of a polymer,
a configuration unit 1101, configured to, when configuring the dedicated pilot of the 2 symbols, add 3 pilot units to the 3 rd symbol and the 9 th symbol for port 7 and port 8; adding 2 or 3 pilot frequency units on the 11 th symbol; for ports 9 and 10, 3 pilot cells are added to the 4 th symbol and the 10 th symbol, and 2 or 3 pilot cells are added to the 12 th symbol.
Preferably, the first and second liquid crystal films are made of a polymer,
the configuration unit is configured to, when configuring the dedicated pilot of the 2 symbol, add pilot units to the port 7 and the port 8 at the same or different positions, and add pilot units to the port 9 and the port 10 at the same or different positions.
Preferably, the first and second liquid crystal films are made of a polymer,
a sending unit 1102, configured to schedule, for a shortened basic scheduling unit sTTI, not less than a preset number of resource blocks RB per 2 symbols when scheduling a terminal-specific pilot.
The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or further divided into a plurality of sub-units.
In summary, in the embodiment of the present application, the UE-specific pilot scheduling of 2 symbols can be supported by the UE-specific pilot of 2 symbols configured on the base station and the terminal. The realization of the scheme can reduce the average air interface delay which can reach about 1ms, and effectively reduce the detection complexity of the terminal during data demodulation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for terminal-specific pilot scheduling, applied to 2-symbol terminal-specific pilot scheduling, the method comprising:
when the base station configures the terminal-specific pilot frequency of 2 symbols, aiming at a port 7 and a port 8, the symbol positions of the added pilot frequency units are respectively on a 3 rd symbol, a 9 th symbol and an 11 th symbol, the subcarrier positions of the added pilot frequency units of the port 7 are not adjacent, and the subcarrier positions of the added pilot frequency units of the port 8 are not adjacent; aiming at a port 9 and a port 10, the positions of the symbols added with pilot frequency units are respectively on a 4 th symbol, a 10 th symbol and a 12 th symbol, the positions of the sub-carriers added with the pilot frequency units by the port 9 are not adjacent, and the positions of the sub-carriers added with the pilot frequency by the port 10 are not adjacent; the positions of the port 7, the port 9 and the port 10 for adding the pilot frequency units are different, and the positions of the port 8, the port 9 and the port 10 for adding the pilot frequency units are different;
when data is sent to a terminal, scheduling is carried out according to the terminal-specific pilot frequency of the locally configured 2-symbol, so that the terminal demodulates the received data sent by the base station according to the locally configured 2-symbol terminal-specific pilot frequency, wherein the terminal-specific pilot frequency of the 2-symbol configured by the terminal is the same as the terminal-specific pilot frequency of the 2-symbol configured by the base station;
wherein,
for port 7 and port 8, adding 3 pilot units on the 3 rd symbol and the 9 th symbol; adding 2 or 3 pilot frequency units on the 11 th symbol;
for port 9 and port 10, adding 3 pilot units on the 4 th symbol and the 10 th symbol, and adding 2 or 3 pilot units on the 12 th symbol;
wherein,
when scheduling the terminal-specific pilot, scheduling not less than a preset number of Resource Blocks (RBs) for 2 symbols at a time for one shortened basic scheduling unit (sTTI).
2. The method of claim 1,
the port 7 and the port 8 add pilot units at the same or different positions, and the port 9 and the port 10 add pilot units at the same or different positions.
3. A terminal-specific pilot scheduling apparatus applied to a base station for 2-symbol terminal-specific pilot scheduling, comprising: a configuration unit and a transmission unit;
the configuration unit is configured to, when configuring the terminal-specific pilot of the 2-symbol, add the symbol positions of the pilot unit to the port 7 and the port 8 as a 3 rd symbol, a 9 th symbol, and an 11 th symbol, respectively, where the positions of the subcarriers of the port 7 to which the pilot unit is added are not adjacent, and the positions of the subcarriers of the port 8 to which the pilot unit is added are not adjacent; aiming at a port 9 and a port 10, the positions of the symbols added with pilot frequency units are respectively on a 4 th symbol, a 10 th symbol and a 12 th symbol, the positions of the sub-carriers added with the pilot frequency units by the port 9 are not adjacent, and the positions of the sub-carriers added with the pilot frequency by the port 10 are not adjacent; the positions of the port 7, the port 9 and the port 10 for adding the pilot frequency units are different, and the positions of the port 8, the port 9 and the port 10 for adding the pilot frequency units are different;
the sending unit is configured to schedule the terminal-specific pilot frequency of the 2 symbols configured locally by the configuration unit when sending data to the terminal, so that the terminal demodulates the received data sent by the base station according to the locally-configured 2-symbol-terminal-specific pilot frequency, where the terminal-specific pilot frequency of the 2 symbols configured by the terminal is the same as the terminal-specific pilot frequency of the 2 symbols configured by the base station;
wherein,
the configuration unit is configured to, when configuring the dedicated pilot of the 2 symbols, add 3 pilot units to the 3 rd symbol and the 9 th symbol for the port 7 and the port 8; adding 2 or 3 pilot frequency units on the 11 th symbol; for port 9 and port 10, adding 3 pilot units on the 4 th symbol and the 10 th symbol, and adding 2 or 3 pilot units on the 12 th symbol;
wherein,
and the sending unit is used for scheduling Resource Blocks (RB) which are not less than a preset value for 2 symbols at each time of a shortened basic scheduling unit (sTTI) when the terminal special pilot is scheduled.
4. The apparatus of claim 3,
the configuration unit is configured to, when configuring the dedicated pilot of the 2 symbol, add pilot units to the port 7 and the port 8 at the same or different positions, and add pilot units to the port 9 and the port 10 at the same or different positions.
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| CN101431490A (en) * | 2007-10-30 | 2009-05-13 | 大唐移动通信设备有限公司 | Pilot frequency insertion method, apparatus, base station and customer equipment of orthogonal frequency division multiplexing system |
| CN101771437A (en) * | 2008-12-31 | 2010-07-07 | 中兴通讯股份有限公司 | Transmission method for dedicated pilot frequency |
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| US8175021B2 (en) * | 2005-11-04 | 2012-05-08 | Texas Instruments Incorporated | Method for transmission of unicast control in broadcast/multicast transmission time intervals |
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| CN101431490A (en) * | 2007-10-30 | 2009-05-13 | 大唐移动通信设备有限公司 | Pilot frequency insertion method, apparatus, base station and customer equipment of orthogonal frequency division multiplexing system |
| CN102187630A (en) * | 2008-10-16 | 2011-09-14 | 交互数字专利控股公司 | Method and apparatus for wireless transmit/receive unit specific pilot signal transmission and wireless transmit/receive unit specific pilot signal power boosting |
| CN101771437A (en) * | 2008-12-31 | 2010-07-07 | 中兴通讯股份有限公司 | Transmission method for dedicated pilot frequency |
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