CN111245557A - Method, device and equipment for improving downlink efficiency of LTE network - Google Patents
Method, device and equipment for improving downlink efficiency of LTE network Download PDFInfo
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Abstract
The embodiment of the invention provides a method, a device and equipment for improving downlink efficiency of an LTE network, which comprises the following steps: adjusting the emission density of a cell specific reference signal in a downlink signal in a service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow and static scene and a mixed scene; and transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density. The method, the device and the equipment of the invention adjust the transmitting density of the cell specific reference signal in the downlink signal in the service area through the scene type, can adjust the transmitting density to be far lower than the currently specified 4 times/ms for medium and low speed scenes, slow speed scenes and static scenes, can reduce the occupation amount of the cell specific reference signal in the downlink signal, and ensure that the downlink signal uses more resources for transmitting the communication data service of a user, thereby improving the downlink efficiency of an LTE network.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method, a device and equipment for improving downlink efficiency of an LTE (long term evolution) network.
Background
The purpose of Cell-specific reference signals (CRS) in an LTE network is not to carry user data, but to provide a technical means for a terminal to estimate a downlink channel; the terminal can obtain the transmission information such as the strength information, the quality information, the synchronization information and the like of the downlink signal through the cell specific reference signal, and the cell specific reference signal is equivalent to a pilot signal.
In each cell, there are 1, 2 or 4 cell-specific reference signals for 1, 2 or 4 antenna ports, respectively. For a cell supporting PDSCH transmission, all downlink subframes (including special subframes) of the cell transmit cell-specific reference signals, which may be transmitted in port 0 or port 0, 1, 2, 3, and respectively correspond to a single-transmit antenna cell or a dual-transmit antenna cell or a four-transmit antenna cell of an actual base station. The more the number of the antennas in the cell is, the stronger the spatial multiplexing capability is, and the larger the bandwidth of the cell is; in order to characterize the propagation characteristics of different antennas, the number of CRSs occupied correspondingly is also increased.
The LTE network stipulates extremely high transmission density for the cell specific reference signal, each subframe is transmitted for 4 times, namely 4 times/ms, and the extremely high pilot frequency transmission density can make up for the influence caused by Doppler frequency shift in a high-speed state, and the communication requirement of the LTE network at the highest high speed of 350Km/h is realized, so that the high-speed communication requirement of the current high-speed rail is met. The RE of the cell-specific reference signal cannot carry data traffic, so for most cells serving stationary or medium-low speed terminals, too many cell-specific reference signals in downlink signals occupy too many downlink resources, causing waste of precious wireless RE resources, thereby affecting downlink efficiency of the LTE network.
Disclosure of Invention
In order to overcome the above problems or at least partially solve the above problems, embodiments of the present invention provide a method, an apparatus, and a device for improving downlink efficiency of an LTE network.
According to a first aspect of the embodiments of the present invention, a method for improving downlink efficiency of an LTE network is provided, including: adjusting the emission density of a cell specific reference signal in a downlink signal in a service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow and static scene and a mixed scene; and transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density.
According to a second aspect of the embodiments of the present invention, there is provided an apparatus for improving downlink efficiency of an LTE network, including: the adjusting module is used for adjusting the transmitting density of the cell specific reference signals in the downlink signals in the service area according to the scene types of the service area, wherein the scene types comprise a high-speed scene, a medium-low speed scene, a slow-speed and static scene and a mixed scene; and the transmitting module is used for transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density.
According to a third aspect of embodiments of the present invention, there is provided an electronic apparatus, including: at least one processor, at least one memory, and a data bus; wherein: the processor and the memory complete mutual communication through a data bus; the memory stores program instructions executable by the processor, and the processor calls the program instructions to perform the method for improving the downlink efficiency of the LTE network provided by any one of the various possible implementations of the first aspect.
According to a fourth aspect of the embodiments of the present invention, there is provided a non-transitory computer-readable storage medium storing a computer program, the computer program causing a computer to execute the method for improving downlink efficiency of an LTE network provided in any one of the various possible implementation manners of the first aspect.
The method, the device and the equipment for improving the downlink efficiency of the LTE network provided by the embodiment of the invention comprise the following steps: adjusting the emission density of a cell specific reference signal in a downlink signal in a service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow and static scene and a mixed scene; and transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density. The method, the device and the equipment of the invention adjust the transmitting density of the cell specific reference signal in the downlink signal in the service area through the scene type, can adjust the transmitting density to be far lower than the currently specified 4 times/ms for medium and low speed scenes, slow speed scenes and static scenes, can reduce the occupation amount of the cell specific reference signal in the downlink signal, and ensure that the downlink signal uses more resources for transmitting the communication data service of a user, thereby improving the downlink efficiency of an LTE network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for improving downlink efficiency of an LTE network according to an embodiment of the present invention;
fig. 2 is a RE position map of cell-specific reference signals transmitted at a transmission density of 4 times/ms according to an embodiment of the present invention;
fig. 3 is a RE position map of cell-specific reference signals transmitted at a transmission density of 2 times/ms according to an embodiment of the present invention;
fig. 4 is a RE position map of cell-specific reference signals transmitted at a transmission density of 1 time/ms according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an apparatus for improving downlink efficiency of an LTE network according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an electronic device provided in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a method for improving downlink efficiency of an LTE network according to an embodiment of the present invention, and as shown in fig. 1, the method for improving downlink efficiency of an LTE network includes: s11, adjusting the emission density of the cell specific reference signal in the downlink signal in the service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow speed and static scene and a mixed scene; and S12, transmitting the cell-specific reference signal to each terminal in the service area according to the adjusted transmission density.
Specifically, when a mobile station moves in a certain direction at a constant velocity, a change in phase and frequency due to a propagation path difference is caused, and such a change is generally called a doppler effect. The difference between the transmitted and received frequencies due to the doppler effect is called the doppler shift; the faster the mobile station speed, the greater the doppler shift. According to the Doppler frequency shift formula, when an LTE signal transmitting station works in a D frequency band (2.6GHz), the Doppler frequency shift fm generated by 350Km/h of a high-speed rail is between-850 Hz and +850Hz, and the total variation is 1700 Hz. In order to ensure no distortion of signals, according to the nyquist sampling theorem, the sampling frequency is at least 2 times greater than the variation, namely greater than 3.4KHz, and is 4KHz directly after sampling, namely 4 times/ms is needed, and in order to meet the communication requirement of a terminal on a high-speed rail, the emission density of cell specific reference signals is uniformly set to 4 times/ms at present.
For the RE position maps of CRSs transmitted with 4 times/ms transmission density under different numbers of antenna ports, as shown in fig. 2, 1 RB is taken as an example and contains 84 REs together, so that the occupation ratio of the CRSs in the downlink resource can be obtained:
for a single antenna (1 antenna), CRS accounts for 4 REs, and the proportion of CRS is 4/84-4.8%;
for dual antenna (2 antennas), CRS accounts for 8 REs, and its share is 8/84-9.6%;
for four antennas (4 antennas), CRS accounts for 12 REs, and the CRS accounts for 12/84-14.4%.
Since the CRS is only equivalent to one pilot signal and is not used for transmitting the communication data of the user, the larger the occupied ratio of the CRS is, the lower the occupied ratio of the communication data for transmitting the user in the downlink signal is, and the lower the downlink efficiency is, on the premise of not affecting the system performance, if the occupied ratio of the CRS can be reduced, the more valuable radio resources can be utilized, and the higher the downlink efficiency of the LTE network is.
For most cells, the service scenes are not high-speed scenes including high-speed rails, for terminals in scenes such as medium-low speed scenes, low-speed scenes, static scenes and the like, the moving speed of the terminals is far lower than that of the high-speed rails, according to a Doppler frequency shift formula, the Doppler frequency shift at low speed is relatively small, and the sampling frequency is relatively small, so that the emission density of CRSs does not need to reach 4 times/ms, the terminals can receive signals without distortion, and for the terminals in any scenes at present, the emission density of CRSs is kept for 4 times/ms, downlink resources are inevitably wasted, and downlink efficiency is low.
In this embodiment, the transmission density of the cell-specific reference signal in the downlink signal in the service area is adjusted according to the scene type of the service area, and particularly for medium-low speed scenes, slow speed scenes and static scenes, the transmission density of the cell-specific reference signal can be correspondingly adjusted downward, and then the cell-specific reference signal is transmitted to each terminal in the service area according to the adjusted transmission density, so that the occupation ratio of the CRS in the downlink signal can be reduced, and the downlink efficiency of the LTE network can be improved.
The method of the embodiment adjusts the transmission density of the cell specific reference signal in the downlink signal in the service area through the scene type, and can adjust the transmission density to be far lower than the currently specified 4 times/ms for medium and low speed scenes, slow speed scenes and static scenes, so that the occupation amount of the cell specific reference signal in the downlink signal can be reduced, more resources of the downlink signal are used for transmitting the communication data service of the user, and the downlink efficiency of the LTE network is improved.
Based on the above embodiment, further, adjusting the transmission density of the cell-specific reference signal in the downlink signal in the service area according to the scene type of the service area includes: acquiring a preset code corresponding to a scene type of a service area; and adjusting the transmission density set for the preset code to the transmission density of the cell specific reference signal in the downlink signal in the service area.
Before acquiring the preset code corresponding to the scene type of the service area, the method further includes: coding each scene type according to a preset rule to obtain a preset code corresponding to each scene type; one transmit density is set for each preset code.
Specifically, for an LTE communication system, when planning a cell base station, a scene type of each cell may be set according to characteristics of a cell coverage area, and the scene type is encoded, for example, a high-speed scene may be encoded as 00, a medium-low speed scene may be encoded as 01, a slow-speed and static scene may be encoded as 10, a mixed scene may be encoded as 11, 00, 01, 10, and 11 are respectively used as preset codes corresponding to scenes, and a transmission density is set for each preset code, for example, on the basis of meeting terminal requirements in different scenes, a transmission density of 4 times/ms is set for 00, a transmission density of 2 times/ms is set for 01, a transmission density of 1 time/ms is set for 10, and a transmission density of 4 times/ms is set for 11; the method comprises the steps that a base station obtains a preset code of a scene corresponding to a cell, the transmission density set for the preset code is adjusted to be the transmission density of a cell specific reference signal of the cell, and then CRS is transmitted to a terminal in a cell coverage area according to the transmission density set for the preset code. The preset codes can be stored in PBCH, the PBCH has 24 bits in total and comprises information such as system bandwidth, PHICH parameter configuration, system frame number and the like, the information occupies 14 bits, 2 bits from the remaining 10 bits are used for storing the preset codes, and the reserved bits of the PBCH are used for storing the preset codes, so that the change of a transmission protocol can be reduced as much as possible, and the change design of a terminal is simplified.
Based on the above embodiment, further, setting a transmission density for each preset code includes: for any preset code, taking a scene type corresponding to the preset code as a target scene type, and determining the highest moving speed of the terminal in a scene corresponding to the target scene type; and determining a target emission density according to the highest moving speed, and setting the target emission density as the emission density set for any one preset code so as to set one emission density for each preset code.
Wherein, the target emission density is determined according to the highest moving speed, and the method comprises the following steps: determining the Doppler frequency shift caused by the highest moving speed; determining a sampling frequency which ensures that a cell specific reference signal is not distorted according to Doppler frequency shift based on the Nyquist sampling theorem; and determining the target emission density according to the sampling frequency.
Specifically, according to a Doppler frequency shift formula and an LTE signal transmitting platform working in a frequency band D (2.6GHz), for a high-speed scene, the highest moving speed in the high-speed scene is a terminal in a high-speed rail, the Doppler frequency shift fm generated by the high-speed rail 350Km/h is between-850 Hz and +850Hz, and the total variation is 1700 Hz; in order to ensure no distortion of signals, according to the nyquist sampling theorem, the sampling frequency is at least 2 times larger than the variable quantity, namely larger than 3.4KHz, and is directly taken as 4KHz, namely 4 times/ms is needed. Similarly, for a medium-low speed scene, the moving speed of the terminal cannot exceed 120Km/h, the maximum Doppler frequency shift cannot exceed 500Hz, and the emission density of the CRS can be reduced to 2 times/ms; for slow and static scenes, the terminal is basically in a static or slow moving state, and the emission density of the CRS can be further reduced to 1 time/ms or even lower; for a mixed scene, there may be a terminal moving at a high speed, such as a high-speed rail, and the transmission density of the CRS may be kept to be 4 times/ms highest.
For medium and low speed scenarios, the RE position map of CRS transmitted at 2 times/ms transmission density under different number of antenna ports is shown in fig. 3, and with respect to fig. 2, the position REs of part of CRS may be converted into radio resources of communication services of users:
for a single antenna (1 antenna), the downlink efficiency can be improved by about 2.5%;
for a dual antenna (2 antenna), the downlink efficiency can be improved by about 5%;
for four antennas (4 antennas), the downlink efficiency can be improved by about 7.5%.
Similarly, for medium and low speed scenarios, the RE position map of CRS transmitted at a transmission density of 2 times/ms under different numbers of antenna ports is shown in fig. 4, and with respect to fig. 2, the position REs of part of CRS may be converted into radio resources of the communication service of the user:
for a single antenna (1 antenna), the downlink efficiency can be improved by about 3.25%;
for a dual antenna (2 antenna), the downlink efficiency can be improved by about 7.5%;
for four antennas (4 antennas), the downlink efficiency can be improved by about 10%.
For the hybrid scenario, the RE position map of the CRS transmitted at the transmission density of 4 times/ms is the same as the position map corresponding to the high-speed scenario under different numbers of antenna ports, as shown in fig. 2.
According to the data, the emission density of the CRS is adjusted according to the scene type, and the downlink efficiency of the LTE network can be effectively improved on the whole.
Based on the above embodiment, further, after obtaining the preset code corresponding to the scene type of the service area, the method includes: and sending the preset code corresponding to the scene type of the service area to each terminal in the service area so that each terminal can analyze the RE mapping chart of the downlink signal in the service area according to the preset code corresponding to the scene type of the service area.
Specifically, as shown in fig. 2, fig. 3, and fig. 4, the base station sends data with different emission densities of CRS, and corresponding RE maps are different from each other, so that the terminal needs to analyze data in different formats of RE maps in different types of scenes, the base station needs to send a preset code corresponding to a scene type to the terminal in the service area, and the terminal selects a format of the corresponding RE map according to the preset code to perform information processing, so as to implement accurate decoding of downlink data.
Fig. 5 is a schematic view of a device for improving downlink efficiency of an LTE network according to an embodiment of the present invention, and as shown in fig. 5, the device for improving downlink efficiency of an LTE network includes: an adjustment module 51 and a transmission module 52, wherein:
an adjusting module 51, configured to adjust the transmission density of a cell specific reference signal in a downlink signal in a service area according to a scene type of the service area, where the scene type includes a high-speed scene, a medium-low speed scene, a slow-speed and static scene, and a mixed scene; and a transmitting module 52, configured to transmit the cell-specific reference signal to each terminal in the service area according to the adjusted transmission density.
The apparatus according to the embodiments of the present invention may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
Fig. 6 is a schematic diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 6, an electronic device includes: at least one processor 61, at least one memory 62 and a data bus 63; wherein: the processor 61 and the memory 62 are communicated with each other through a data bus 63; the memory 62 stores program instructions executable by the processor 61, and the processor 61 calls the program instructions to perform the method for improving the downlink efficiency of the LTE network provided by the above method embodiments, for example, the method includes: adjusting the emission density of a cell specific reference signal in a downlink signal in a service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow and static scene and a mixed scene; and transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density.
An embodiment of the present invention provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program enables the computer to execute the method for improving the downlink efficiency of the LTE network provided in the foregoing method embodiments, for example, the method includes: adjusting the emission density of a cell specific reference signal in a downlink signal in a service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow and static scene and a mixed scene; and transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to computer program instructions, where the computer program may be stored in a computer readable storage medium, and when executed, the computer program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, the description is as follows: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for improving downlink efficiency of an LTE network is characterized by comprising the following steps:
adjusting the emission density of a cell specific reference signal in a downlink signal in a service area according to the scene type of the service area, wherein the scene type comprises a high-speed scene, a medium-low speed scene, a slow and static scene and a mixed scene;
and transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density.
2. The method of claim 1, wherein the adjusting the transmission density of the cell-specific reference signals in the downlink signals in the service area according to the scene type of the service area comprises:
acquiring a preset code corresponding to the scene type of the service area;
and adjusting the transmission density set for the preset code to be the transmission density of the cell specific reference signal in the downlink signal in the service area.
3. The method according to claim 2, wherein before the obtaining the preset code corresponding to the scene type of the service area, the method further comprises:
coding each scene type according to a preset rule to obtain a preset code corresponding to each scene type;
one transmit density is set for each preset code.
4. The method of claim 3, wherein setting a transmit density for each predetermined code comprises:
for any preset code, taking a scene type corresponding to the preset code as a target scene type, and determining the highest moving speed of a terminal in a scene corresponding to the target scene type;
and determining a target emission density according to the highest moving speed, and setting the target emission density as the emission density set for any one preset code so as to set one emission density for each preset code.
5. The method of claim 4, wherein determining a target emission density based on the highest moving velocity comprises:
determining a Doppler shift caused by the highest moving speed;
determining a sampling frequency which ensures that the cell-specific reference signal is not distorted according to the Doppler frequency shift based on a Nyquist sampling theorem;
and determining the target emission density according to the sampling frequency.
6. The method according to claim 2, wherein after obtaining the preset code corresponding to the scene type of the service area, the method comprises:
and sending the preset code corresponding to the scene type of the service area to each terminal in the service area so that each terminal can analyze the RE mapping chart of the downlink signal in the service area according to the preset code corresponding to the scene type of the service area.
7. An apparatus for improving downlink efficiency of an LTE network, comprising:
the adjusting module is used for adjusting the transmitting density of the cell specific reference signals in the downlink signals in the service area according to the scene types of the service area, wherein the scene types comprise a high-speed scene, a medium-low speed scene, a slow-speed and static scene and a mixed scene;
and the transmitting module is used for transmitting the cell specific reference signal to each terminal in the service area according to the adjusted transmission density.
8. An electronic device, comprising:
at least one processor, at least one memory, and a data bus; wherein:
the processor and the memory complete mutual communication through the data bus; the memory stores program instructions executable by the processor, the processor calling the program instructions to perform the method of any of claims 1 to 6.
9. A non-transitory computer-readable storage medium storing a computer program that causes a computer to perform the method according to any one of claims 1 to 6.
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| 李玉钊等: "无线电脉冲引信距离特性分析", 《制导与引信》 * |
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