CN105766024A - Transmission mode switching method and base station - Google Patents
Transmission mode switching method and base station Download PDFInfo
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- CN105766024A CN105766024A CN201480037475.6A CN201480037475A CN105766024A CN 105766024 A CN105766024 A CN 105766024A CN 201480037475 A CN201480037475 A CN 201480037475A CN 105766024 A CN105766024 A CN 105766024A
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Abstract
The present invention relates to the field of communications. Disclosed are a transmission mode switching method and base station, the method comprising: a base station acquires a current transmission mode of a user equipment(UE), the transmission mode comprising a single-port transmission mode and an N-port transmission mode, N being equal to the number of antennas of a cell where the UE is located; the base station detects a position of the UE in the cell, the position comprising a central area and an edge area; and the base station switches the transmission mode of the UE to the N-port transmission mode, configures N CSI-RS ports for the UE, and notifies the UE of the N-port transmission mode and the N CSI-RS ports when the UE is operating in the single-port transmission mode and is located in the central area, or the base station switches the transmission mode of the UE to the single-port transmission mode and notifies the UE of the single-port transmission mode when the UE is operating in the N-port transmission mode and is located in the edge area.
Description
The present invention relates to the field of communications, and in particular, to a transmission mode switching method and a base station.
With the gradual increase of the number of mobile users and the increasing upgrade of mobile communication traffic, the third Generation Partnership Project (3 GPP) has proposed a Long Term Evolution (LTE) system as a standard for future mobile communication in order to meet the needs of real-world technologies. In the standard protocol of the LTE system, a plurality of transmission modes (denoted as TM, including TM1 to TM9) that can be used by a Physical Downlink Shared Channel (PDSCH) of the LTE system are specified, and MIMO modes used by each transmission mode are different, and some transmission modes further include a plurality of MIMO modes. For example, TM1 is a single port MIMO scheme; TM3 may use a transmission diversity MIMO system or a spatial multiplexing MIMO system for transmission. Spatial multiplexing is a technique based on simultaneous transmission of multiple codewords to increase the amount of data to be transmitted, that is, multiple independent data streams are mapped to different layers and then transmitted by different antennas, and the spatial multiplexing MIMO scheme in TM3 uses 2-port transmission.
For a common cell dual-antenna networking scenario, when the user equipment transmits in the 2-port TM3 mode, the user equipment may operate in a single-stream mode and a dual-stream mode. Specifically, the ue first detects a Signal to Interference plus Noise Ratio (SINR), and then calculates spectral efficiencies of transmission in a single-stream mode and a dual-stream mode according to the SINR, and selects the transmission with high spectral efficiency. Generally, the SINR value of the central area is high, and the SINR value of the edge area is low, so that when the ue is in the central area, the ue usually operates in a dual-stream mode, and when the ue is in the edge area, the ue usually operates in a single-stream mode.
Compared with the TM1 mode, the user equipment in the center of the cell can obtain the spatial multiplexing gain brought by the 2-port TM3 mode, and the transmission performance is higher than that of the TM1 mode. The transmission performance of the user at the Cell edge using the 2-port TM3 is lower than that of the TM1 mode, because the Cell edge operates in the single-stream mode in the 2-port TM3 mode, the transmission efficiency is similar to that of the TM1, but two Cell Reference Signal (CRS) ports are used as pilot ports, and compared with the TM1 which only needs one CRS port, the generated pilot interference is greater than that of the TM1 mode.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
after the transmission mode of the cell is determined, the number of CRS ports of the cell is fixed, for example, 1 CRS port is configured when the transmission mode of the cell is TM1, or 2 CRS ports are configured when the transmission mode of the cell is TM3, so that a 1-port TM1 mode and a 2-port TM3 mode cannot be configured simultaneously in the cell, but only one of them can be configured, so that no matter which mode is used, the user equipment in the cell center region and the user equipment in the cell edge region can not achieve the optimal transmission performance simultaneously.
Disclosure of Invention
In order to solve the problems in the prior art, embodiments of the present invention provide a transmission mode switching method and a base station. The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a method for switching transmission modes, where the method includes:
a base station acquires a current transmission mode of user equipment, wherein the transmission mode comprises a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the base station configures N signal state information reference signal (CSI-RS) ports for the user equipment, wherein N is 2, 4 or 8, and the number of N is equal to the number of antennas of a cell where the user equipment is located;
the base station detects the position of the user equipment in the cell, wherein the position comprises a central area and an edge area;
when the user equipment is currently working in the 1-port transmission mode and the user equipment is located in the central area, the base station switches the transmission mode of the user equipment to the N-port transmission mode, configures N CSI-RS ports for the user equipment, and notifies the N-port transmission mode and the N CSI-RS ports to the user equipment; alternatively, the first and second electrodes may be,
when the user equipment is currently working in the N port transmission mode and the user equipment is in the edge area, the base station switches the transmission mode of the user equipment to the 1 port transmission mode and notifies the 1 port transmission mode to the user equipment.
In an implementation manner of the embodiment of the present invention, the detecting a location of the ue in the cell includes:
detecting a spectral efficiency of the user equipment;
when the spectrum efficiency of the user equipment is greater than a first threshold value, determining that the user equipment is located in the central area; alternatively, the first and second electrodes may be,
when the spectrum efficiency of the user equipment is smaller than or equal to the first threshold value, determining that the user equipment is in the edge area.
In another implementation manner of the embodiment of the present invention, the detecting the spectrum efficiency of the user equipment includes:
acquiring the channel quality sent by the user equipment;
and calculating the spectrum efficiency of the user equipment according to the channel quality.
In another implementation manner of the embodiment of the present invention, the detecting a location of the ue in the cell includes:
when the user equipment works in the N-port transmission mode currently, detecting the proportion of the user equipment adopting single-stream mode transmission in the total transmission time;
when the proportion of the user equipment adopting single-flow mode transmission is larger than a second threshold value, determining that the user equipment is in the edge area; alternatively, the first and second electrodes may be,
and when the proportion of the user equipment adopting single-flow mode transmission is less than or equal to the second threshold value, determining that the user equipment is in the central area.
In another implementation manner of the embodiment of the present invention, the detecting a proportion of the single stream mode transmission adopted by the ue in a total transmission duration includes:
recording the transmission duration of the user equipment using a single stream mode in the transmission process;
and calculating the proportion of the transmission time length of the single-flow mode to the total transmission time length to obtain the proportion of the transmission time length of the user equipment in the total transmission time length by adopting the single-flow mode.
In another implementation manner of the embodiment of the present invention, the method further includes:
when the user equipment accesses a cell, configuring the transmission mode of the user equipment as the 1-port transmission mode.
On the other hand, an embodiment of the present invention further provides a base station, where the base station includes:
the receiving and sending module is used for communicating with the user equipment;
an obtaining module, configured to obtain a current transmission mode of the ue, where the transmission mode includes a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the ue is configured with N CSI-RS ports, where N is 2, 4, or 8, and the number of N is equal to the number of antennas in a cell where the ue is located;
a detecting module, configured to detect a location of the user equipment in the cell, where the location includes a center area and an edge area;
a processing module, configured to switch a transmission mode of the ue to the N-port transmission mode when the ue is currently operating in the 1-port transmission mode and the ue is located in the central area, configure N CSI-RS ports for the ue, and notify the N-port transmission mode and the N CSI-RS ports to the ue through the transceiver module; alternatively, the first and second electrodes may be,
when the user equipment works in the N port transmission mode currently and the user equipment is in the edge area, switching the transmission mode of the user equipment to the 1 port transmission mode, and notifying the 1 port transmission mode to the user equipment through the transceiver module.
In an implementation manner of the embodiment of the present invention, the detection module includes:
a first detecting unit, configured to detect a spectrum efficiency of the user equipment;
a first determining unit, configured to determine that the user equipment is located in the central area when the spectral efficiency of the user equipment is greater than a first threshold; alternatively, the first and second electrodes may be,
when the spectrum efficiency of the user equipment is smaller than or equal to the first threshold value, determining that the user equipment is in the edge area.
In another implementation manner of the embodiment of the present invention, the first detecting unit includes:
an obtaining subunit, configured to obtain, through the transceiver module, channel quality sent by the user equipment;
a first calculating subunit, configured to calculate a spectral efficiency of the user equipment according to the channel quality.
In another implementation manner of the embodiment of the present invention, the detection module includes:
a second detecting unit, configured to detect, when the ue currently operates in the N-port transmission mode, a ratio of single-stream mode transmission used by the ue in a total transmission duration;
a second determining unit, configured to determine that the ue is in the edge area when a ratio of single-stream mode transmission adopted by the ue is greater than a second threshold; alternatively, the first and second electrodes may be,
and when the proportion of the user equipment adopting single-flow mode transmission is less than or equal to the second threshold value, determining that the user equipment is in the central area.
In another implementation manner of the embodiment of the present invention, the second detecting unit includes:
a recording subunit, configured to record a transmission duration of a single stream mode used by the ue in a transmission process;
and the second calculating subunit is configured to calculate a ratio of the transmission time length of the single-stream mode to the total transmission time length, so as to obtain a ratio of the transmission time length of the single-stream mode to the total transmission time length of the user equipment.
In another implementation manner of the embodiment of the present invention, the processing module is further configured to configure the transmission mode of the user equipment as the 1-port transmission mode when the user equipment accesses a cell.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
by taking the position of the user equipment in the cell as a central area or an edge area, when the user equipment works in a 1-port transmission mode and is in the central area, switching the transmission mode of the user equipment to an N-port transmission mode, configuring N CSI-RS ports for the user equipment, and when the user equipment works in the N-port transmission mode and is in the edge area, switching the transmission mode of the user equipment to the 1-port transmission mode, so that the user equipment in the central area adopts the N-port transmission mode to transmit data, and spatial multiplexing gains of multiple antennas are obtained; the user equipment in the edge area transmits data by adopting a 1-port transmission mode, and the pilot frequency transmission interference is reduced.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram of an application scenario provided by an embodiment of the present invention;
fig. 2 is a flowchart of a transmission mode switching method according to an embodiment of the present invention;
fig. 3 is a flowchart of a transmission mode switching method according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station according to a fifth embodiment of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
For convenience of description of the embodiments, the following briefly introduces an application scenario of the embodiments of the present invention. Referring to fig. 1, the scenario is a multi-antenna general cell, the number of antennas may be 2, 4 and 8, and the cell 10 includes a center area 20 and an edge area 30. In the background art it has been pointed out that: the use of N-port transmission mode in the central region 20 can enable the ue to obtain spatial multiplexing gain of multiple antennas, and the use of 1-port transmission mode in the edge region 30 can reduce pilot interference. Therefore, in order to maximize the transmission efficiency, it is necessary to design a transmission scheme: and the user equipment adopts the maximum port transmission mode to carry out data transmission in the central area, and adopts the 1-port transmission mode to carry out data transmission in the edge area. The specific scheme is shown in the following examples.
For convenience of description, the embodiment of the present invention is described by taking an LTE system as an example. The method provided by the embodiment of the invention can be used in wireless networks of different systems, such as: an LTE system or a subsequent evolution system of LTE, and the like. The base station of the LTE system is an evolved NodeB (eNodeB).
An embodiment of the present invention provides a method for switching transmission modes, referring to fig. 2, where the method includes:
step 101: the base station acquires a current transmission mode of the user equipment, wherein the transmission mode comprises a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the base station configures N signal state information reference signal (CSI-RS) ports for the user equipment, N is 2, 4 or 8, and the number of N is equal to the number of antennas of a cell where the user equipment is located.
The 1-port transmission mode may adopt a transmission mode 1, and the N-port mode may adopt a transmission mode 9. In the transmission mode 1, the user equipment adopts 1 CRS port to carry out channel quality detection, and then determines information such as a coding mode and the like according to the channel quality so as to carry out data transmission; in the N-port transmission mode 9, the ue uses N Signal State Information Reference Signal (CSI-RS) ports to perform Channel quality detection, then determines Information such as a coding mode according to the Channel quality, and configures 1 CRS port at the same time, where the CRS port is used to send cell broadcast, and the ue can perform downlink Signal strength measurement according to the cell broadcast.
The CRS port is a cell level port, and all user equipment in the cell is configured with the same CRS port; the CSI-RS ports are user-level ports, and the base station may configure different CSI-RS ports for each ue in the cell.
Therefore, in this embodiment, in order to implement that the ue in the central area transmits in the N-port transmission mode, the ue in the edge area transmits in the 1-port transmission mode, the base station configures the ue newly accessing the cell as transmission mode 1, and configures the 1-cell port in transmission mode 1: a CRS port; then, detecting the position of the user equipment, if the user equipment is in the central area, switching the transmission mode of the user equipment to a transmission mode 9, and configuring N user-level ports under the condition that CRS ports are unchanged: a CSI-RS port.
Step 102: the base station detects the position of the user equipment in the cell, wherein the position comprises a central area and an edge area.
Step 103: when the user equipment works in a 1-port transmission mode currently and is in a central area, the base station switches the transmission mode of the user equipment to an N-port transmission mode, configures N CSI-RS ports for the user equipment, and informs the user equipment of the N-port transmission mode and the N CSI-RS ports; or, when the ue currently operates in the N-port transmission mode and the ue is in the edge area, the base station switches the transmission mode of the ue to the 1-port transmission mode, and notifies the 1-port transmission mode to the ue.
Specifically, when the base station switches the transmission mode of the user equipment to an N-port transmission mode, first, N CSI-RS ports are allocated to the user equipment, and then, the positions of the CSI-RS ports and the transmission mode are sent to the user equipment through information.
And when the base station switches the transmission mode of the user equipment to the 1-port transmission mode, the transmission mode is only required to be sent to the user equipment.
The embodiment of the invention switches the transmission mode of the user equipment to the N-port transmission mode by detecting that the position of the user equipment in a cell is a central area or an edge area, and configures N CSI-RS ports for the user equipment when the user equipment works in the 1-port transmission mode and is in the central area, and switches the transmission mode of the user equipment to the 1-port transmission mode when the user equipment works in the N-port transmission mode and is in the edge area, so that the user equipment in the central area adopts the N-port transmission mode to transmit data and obtains the spatial multiplexing gain of multiple antennas; the user equipment in the edge area transmits data by adopting a 1-port transmission mode, and the pilot frequency transmission interference is reduced.
An embodiment of the present invention provides a method for switching transmission modes, referring to fig. 3, where the method includes:
step 201: the base station acquires a current transmission mode of the user equipment, wherein the transmission mode comprises a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the base station configures N signal state information reference signal (CSI-RS) ports for the user equipment, N is 2, 4 or 8, and the number of N is equal to the number of antennas of a cell where the user equipment is located.
The 1-port transmission mode may adopt a transmission mode 1, and the N-port mode may adopt a transmission mode 9. In the transmission mode 1, the user equipment adopts 1 CRS port to carry out channel quality detection, and then determines information such as a coding mode and the like according to the channel quality so as to carry out data transmission; in the N-port transmission mode 9, N CSI-RS ports are used for channel quality detection, then information such as a coding mode is determined according to channel quality, and 1 CRS port is configured at the same time, where the CRS port is used for transmitting cell broadcast, and user equipment can perform downlink signal strength measurement according to the cell broadcast.
Therefore, in this embodiment, in order to implement that the ue in the central area transmits in the N-port transmission mode, the ue in the edge area transmits in the 1-port transmission mode, the base station configures the ue newly accessing the cell as transmission mode 1, and configures the 1-cell port in transmission mode 1: a CRS port; then, detecting the position of the user equipment, if the user equipment is in the central area, switching the transmission mode of the user equipment to a transmission mode 9, and configuring N user-level ports under the condition that CRS ports are unchanged: a CSI-RS port. The cell level port and the user level port are configured for the user equipment by the base station according to the transmission mode, the cell level port refers to the port on which the user equipment in the cell needs to be configured identically, and the user level port refers to the port on which the base station can respectively perform different configurations for each user.
That is, when the user equipment accesses the cell, the transmission mode of the user equipment is configured as a 1-port transmission mode.
Step 202: the base station detects the spectral efficiency of the user equipment.
Specifically, step 202 may be performed in the following manner:
a base station acquires the channel quality sent by user equipment;
the base station calculates the spectral efficiency of the user equipment according to the channel quality.
Step 203: when the spectrum efficiency of the user equipment is greater than a first threshold value, the base station determines that the user equipment is in a central area; or, when the spectrum efficiency of the user equipment is less than or equal to the first threshold, the base station determines that the user equipment is in the edge area.
Further, when the ue is currently operating in the N-port transmission mode, step 202 and step 203 may further be performed by the following method:
the base station detects the proportion of the user equipment in the total transmission time length by adopting single-flow mode transmission;
when the proportion of the user equipment adopting the single-flow mode transmission is larger than a second threshold value, the base station determines that the user equipment is in an edge area; or, when the proportion of the single-stream mode transmission adopted by the user equipment is less than or equal to the second threshold, the base station determines that the user equipment is in the central area.
However, when the user operates in the 1-port transmission mode, the user cannot determine the current location of the user equipment in this way because the user operates in a single stream only.
Specifically, when the ue operates in the N-port transmission mode, the ue may operate in a single-stream mode and a multi-stream mode, and the basis for the ue to select the single-stream mode or the multi-stream mode is as follows: and respectively calculating the spectral efficiency when a single-flow mode and a multi-flow mode work according to the SINR value, and selecting the mode with higher spectral efficiency as the current working mode. The SINR value of the edge area is low, the frequency spectrum efficiency is higher than that of the multi-flow mode by adopting a single-flow mode, when the proportion of the single-flow mode transmission adopted by the user equipment is higher than a second threshold value, the user equipment is positioned in the edge area of the cell, otherwise, the user equipment is positioned in the central area.
Wherein, detecting the proportion of the single-stream mode transmission adopted by the user equipment in the total transmission time comprises:
a base station records the transmission duration of the user equipment using a single-stream mode in the transmission process;
and the base station calculates the proportion of the transmission time length of the single-flow mode to the total transmission time length to obtain the proportion of the transmission time length of the user equipment in the total transmission time length by adopting the single-flow mode.
The total transmission duration may be a set value, for example, when the transmission duration using the single-stream mode is detected, a detection period may be determined, and the transmission duration using the single-stream mode is detected in the period, where the period is the total transmission duration.
Step 204: when the user equipment works in a 1-port transmission mode currently and is in a central area, the base station switches the transmission mode of the user equipment to an N-port transmission mode, configures N CSI-RS ports for the user equipment, and informs the user equipment of the N-port transmission mode and the N CSI-RS ports; or, when the ue currently operates in the N-port transmission mode and the ue is in the edge area, the base station switches the transmission mode of the ue to the 1-port transmission mode, and notifies the 1-port transmission mode to the ue.
Specifically, when the base station switches the transmission mode of the user equipment to an N-port transmission mode, first, N CSI-RS ports are allocated to the user equipment, and then, the positions of the CSI-RS ports and the transmission mode are sent to the user equipment through information.
And when the base station switches the transmission mode of the user equipment to the 1-port transmission mode, the transmission mode is only required to be sent to the user equipment.
The embodiment of the invention switches the transmission mode of the user equipment to the N-port transmission mode by detecting that the position of the user equipment in a cell is a central area or an edge area, and configures N CSI-RS ports for the user equipment when the user equipment works in the 1-port transmission mode and is in the central area, and switches the transmission mode of the user equipment to the 1-port transmission mode when the user equipment works in the N-port transmission mode and is in the edge area, so that the user equipment in the central area adopts the N-port transmission mode to transmit data and obtains the spatial multiplexing gain of multiple antennas; the user equipment in the edge area transmits data by adopting a 1-port transmission mode, and the pilot frequency transmission interference is reduced.
An embodiment of the present invention provides a base station, and referring to fig. 4, the base station includes:
a transceiving module 300 for communicating with a user equipment;
an obtaining module 301, configured to obtain a current transmission mode of a user equipment, where the transmission mode includes a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the user equipment is configured with N CSI-RS ports, where N is 2, 4, or 8, and the number of N is equal to the number of antennas in a cell where the user equipment is located.
The 1-port transmission mode may adopt a transmission mode 1, and the N-port mode may adopt a transmission mode 9. In the transmission mode 1, the user equipment adopts 1 CRS port to carry out channel quality detection, and then determines information such as a coding mode and the like according to the channel quality so as to carry out data transmission; in the N-port transmission mode 9, the user equipment performs channel quality detection using N CSI-RS ports, determines information such as a coding scheme according to the channel quality, and configures 1 CRS port at the same time, where the CRS port is used to transmit cell broadcast, and the user equipment may perform downlink signal strength measurement according to the cell broadcast.
The CRS port is a cell level port, and all user equipment in the cell is configured with the same CRS port; the CSI-RS ports are user-level ports, and the base station may configure different CSI-RS ports for each ue in the cell.
Therefore, in this embodiment, in order to implement that the ue in the central area transmits in the N-port transmission mode, the ue in the edge area transmits in the 1-port transmission mode, the base station configures the ue newly accessing the cell as transmission mode 1, and configures the 1-cell port in transmission mode 1: a CRS port; then, detecting the position of the user equipment, if the user equipment is in the central area, switching the transmission mode of the user equipment to a transmission mode 9, and configuring N user-level ports under the condition that CRS ports are unchanged: a CSI-RS port.
A detecting module 302, configured to detect a location of a user equipment in a cell, where the location includes a center area and an edge area.
The processing module 303 is configured to, when the user equipment currently operates in the 1-port transmission mode and is located in the central area, switch the transmission mode of the user equipment to an N-port transmission mode, configure N CSI-RS ports for the user equipment, and notify the N-port transmission mode and the N CSI-RS ports to the user equipment through the transceiver module 300; or, when the ue currently operates in the N-port transmission mode and the ue is in the edge area, the transmission mode of the ue is switched to the 1-port transmission mode, and the ue is notified of the 1-port transmission mode through the transceiver module 300.
Specifically, when the base station switches the transmission mode of the user equipment to an N-port transmission mode, first, N CSI-RS ports are allocated to the user equipment, and then, the positions of the CSI-RS ports and the transmission mode are sent to the user equipment through information.
And when the base station switches the transmission mode of the user equipment to the 1-port transmission mode, the transmission mode is only required to be sent to the user equipment.
The embodiment of the invention switches the transmission mode of the user equipment to the N-port transmission mode by detecting that the position of the user equipment in a cell is a central area or an edge area, and configures N CSI-RS ports for the user equipment when the user equipment works in the 1-port transmission mode and is in the central area, and switches the transmission mode of the user equipment to the 1-port transmission mode when the user equipment works in the N-port transmission mode and is in the edge area, so that the user equipment in the central area adopts the N-port transmission mode to transmit data and obtains the spatial multiplexing gain of multiple antennas; the user equipment in the edge area transmits data by adopting a 1-port transmission mode, and the pilot frequency transmission interference is reduced.
An embodiment of the present invention provides a base station, and referring to fig. 5, the base station includes:
a transceiving module 400 for communicating with a user equipment;
an obtaining module 401, configured to obtain a current transmission mode of a user equipment, where the transmission mode includes a 1-port transmission mode and an N-port transmission mode, where for the N-port transmission mode, the user equipment is configured with N CSI-RS ports, N is 2, 4, or 8, and the number of N is equal to the number of antennas in a cell where the user equipment is located.
The 1-port transmission mode may adopt a transmission mode 1, and the N-port mode may adopt a transmission mode 9. In the transmission mode 1, the user equipment adopts 1 CRS port to carry out channel quality detection, and then determines information such as a coding mode and the like according to the channel quality so as to carry out data transmission; in the N-port transmission mode 9, the user equipment performs channel quality detection using N CSI-RS ports, determines information such as a coding scheme according to the channel quality, and configures 1 CRS port at the same time, where the CRS port is used to transmit cell broadcast, and the user equipment may perform downlink signal strength measurement according to the cell broadcast.
The CRS port is a cell level port, and all user equipment in the cell is configured with the same CRS port; the CSI-RS ports are user-level ports, and the base station may configure different CSI-RS ports for each ue in the cell.
Therefore, in this embodiment, in order to implement that the ue in the central area transmits in the N-port transmission mode, the ue in the edge area transmits in the 1-port transmission mode, the base station configures the ue newly accessing the cell as transmission mode 1, and configures the 1-cell port in transmission mode 1: a CRS port; then, detecting the position of the user equipment, if the user equipment is in the central area, switching the transmission mode of the user equipment to a transmission mode 9, and configuring N user-level ports under the condition that CRS ports are unchanged: a CSI-RS port.
A detecting module 402, configured to detect a location of a user equipment in a cell, where the location includes a center area and an edge area.
A processing module 403, configured to switch the transmission mode of the user equipment to an N-port transmission mode when the user equipment is currently operating in a 1-port transmission mode and the user equipment is located in a central area, configure N CSI-RS ports for the user equipment, and notify the user equipment of the N-port transmission mode and the N CSI-RS ports through the transceiver module 400; or, when the ue currently operates in the N-port transmission mode and the ue is in the edge area, the transmission mode of the ue is switched to the 1-port transmission mode, and the ue is notified of the 1-port transmission mode through the transceiver module 400.
Specifically, when the base station switches the transmission mode of the user equipment to the N-port transmission mode, first, N CSI-RS ports are allocated to the user equipment, and then, the positions of the CSI-RS ports and the transmission mode are sent to the user equipment through the transceiver module 400, and the user equipment performs transmission according to the transmission mode and the positions of the CSI-RS ports, where the position of the CSI-RS port is the position of the time-frequency resource occupied by the CSI-RS port.
And when the base station switches the transmission mode of the user equipment to the 1-port transmission mode, the transmission mode is only required to be sent to the user equipment.
In an implementation manner of the embodiment of the present invention, the detecting module 402 may include:
a first detecting unit 4021, configured to detect a spectral efficiency of a user equipment;
a first determining unit 4022, configured to determine that the user equipment is located in a central area when the spectral efficiency of the user equipment is greater than a first threshold; or when the spectrum efficiency of the user equipment is smaller than or equal to a first threshold value, determining that the user equipment is in the edge area.
Specifically, the first detection unit 4021 may include:
an obtaining subunit, configured to obtain, through the transceiving module 400, channel quality sent by the user equipment;
a first calculating subunit, configured to calculate a spectral efficiency of the user equipment using the channel quality.
In another implementation manner of the embodiment of the present invention, the detecting module 402 may include:
the second detection unit is used for detecting the proportion of the user equipment in the total transmission time length by adopting single-flow mode transmission when the user equipment works in the N-port transmission mode currently;
a second determining unit, configured to determine that the ue is in an edge area when the ratio of the single-stream mode transmission adopted by the ue is greater than a second threshold; or when the proportion of the user equipment adopting the single-stream mode transmission is less than or equal to the second threshold value, determining that the user equipment is in the central area.
However, when the user operates in the 1-port transmission mode, the user cannot determine the current location of the user equipment in this way because the user operates in a single stream only.
Specifically, when the ue operates in the N-port transmission mode, the ue may operate in a single-stream mode and a multi-stream mode, and the basis for the ue to select the single-stream mode or the multi-stream mode is as follows: and respectively calculating the spectral efficiency when a single-flow mode and a multi-flow mode work according to the SINR value, and selecting the mode with higher spectral efficiency as the current working mode. The SINR value of the edge area is low, the frequency spectrum efficiency is higher than that of the multi-flow mode by adopting a single-flow mode, when the proportion of the single-flow mode transmission adopted by the user equipment is higher than a second threshold value, the user equipment is positioned in the edge area of the cell, otherwise, the user equipment is positioned in the central area.
Specifically, the second detection unit may include:
the recording subunit is used for recording the transmission duration of the user equipment using the single-stream mode in the transmission process;
and the second calculating subunit is configured to calculate a ratio of the transmission time length of the single-stream mode to the total transmission time length, so as to obtain a ratio of the transmission time length of the user equipment in the single-stream mode to the total transmission time length.
The total transmission duration may be a set value, for example, when the transmission duration using the single-stream mode is detected, a detection period may be determined, and the transmission duration using the single-stream mode is detected in the period, where the period is the total transmission duration.
Further, the processing module 403 is further configured to configure the transmission mode of the user equipment as a 1-port transmission mode when the user equipment accesses the cell.
The embodiment of the invention switches the transmission mode of the user equipment to the N-port transmission mode by detecting that the position of the user equipment in a cell is a central area or an edge area, and configures N CSI-RS ports for the user equipment when the user equipment works in the 1-port transmission mode and is in the central area, and switches the transmission mode of the user equipment to the 1-port transmission mode when the user equipment works in the N-port transmission mode and is in the edge area, so that the user equipment in the central area adopts the N-port transmission mode to transmit data and obtains the spatial multiplexing gain of multiple antennas; the user equipment in the edge area transmits data by adopting a 1-port transmission mode, and the pilot frequency transmission interference is reduced.
An embodiment of the present invention provides a base station, and referring to fig. 6, the base station includes: a processor 501, a memory 502, a transceiver 503, and a bus; the memory 502 is used for storing computer-executable instructions, the processor 501 is connected with the memory 502 through a bus, and when the base station runs, the processor 501 executes the computer-executable instructions stored in the memory 502, so that the base station executes the transmission mode switching method as described in fig. 1 or fig. 2.
Specifically, the processor 501 is configured to obtain a current transmission mode of the ue, where the transmission mode includes a 1-port transmission mode and an N-port transmission mode, where for the N-port transmission mode, the ue is configured with N CSI-RS ports, N is 2, 4, or 8, and the number of N is equal to the number of antennas in a cell where the ue is located.
The 1-port transmission mode may adopt a transmission mode 1, and the N-port mode may adopt a transmission mode 9. In the transmission mode 1, the user equipment adopts 1 CRS port to carry out channel quality detection, and then determines information such as a coding mode and the like according to the channel quality so as to carry out data transmission; in the N-port transmission mode 9, the user equipment performs channel quality detection using N CSI-RS ports, determines information such as a coding scheme according to the channel quality, and configures 1 CRS port at the same time, where the CRS port is used to transmit cell broadcast, and the user equipment may perform downlink signal strength measurement according to the cell broadcast.
The CRS port is a cell level port, and all user equipment in the cell is configured with the same CRS port; the CSI-RS ports are user-level ports, and the base station may configure different CSI-RS ports for each ue in the cell.
Therefore, in this embodiment, in order to implement that the ue in the central area transmits in the N-port transmission mode, the ue in the edge area transmits in the 1-port transmission mode, the base station configures the ue newly accessing the cell as transmission mode 1, and configures the 1-cell port in transmission mode 1: a CRS port; then, detecting the position of the user equipment, if the user equipment is in the central area, switching the transmission mode of the user equipment to a transmission mode 9, and configuring N user-level ports under the condition that CRS ports are unchanged: a CSI-RS port.
The processor 501 is further configured to detect a location of the user equipment in the cell, where the location includes a center area and an edge area.
The processor 501 is further configured to switch the transmission mode of the user equipment to an N-port transmission mode when the user equipment is currently operating in a 1-port transmission mode and the user equipment is located in a central area, configure N CSI-RS ports for the user equipment, and notify the N-port transmission mode and the N CSI-RS ports to the user equipment through the transceiver 503; or, when the ue is currently operating in the N-port transmission mode and the ue is in the edge area, the transmission mode of the ue is switched to the 1-port transmission mode, and the 1-port transmission mode is notified to the ue through the transceiver 503.
Specifically, when the processor 501 switches the transmission mode of the user equipment to the N-port transmission mode, first, N CSI-RS ports are allocated to the user equipment, and then, the positions of the CSI-RS ports and the transmission mode are sent to the user equipment through the transceiver 503, and the user equipment performs transmission according to the transmission mode and the positions of the CSI-RS ports, where the position of the CSI-RS port is the position of the time-frequency resource occupied by the CSI-RS port.
When the processor 501 switches the transmission mode of the ue to the 1-port transmission mode, the transmission mode only needs to be sent to the ue.
In an implementation manner of the embodiment of the present invention, the processor 501 may detect the location of the user equipment in the cell by:
the processor 501 detects the spectral efficiency of the user equipment;
when the spectrum efficiency of the user equipment is greater than a first threshold value, determining that the user equipment is in a central area; or when the spectrum efficiency of the user equipment is smaller than or equal to a first threshold value, determining that the user equipment is in the edge area.
Specifically, the processor 501 may detect the spectral efficiency of the user equipment by:
the processor 501 obtains the channel quality sent by the user equipment through the transceiver 503;
the channel quality is used to calculate the spectral efficiency of the user equipment.
In another implementation manner of the embodiment of the present invention, the processor 501 may detect the location of the user equipment in the cell by:
when the ue currently operates in the N-port transmission mode, the processor 501 detects a ratio of the total transmission duration of the ue in the single-stream mode;
when the proportion of the user equipment adopting the single-flow mode transmission is larger than a second threshold value, determining that the user equipment is in an edge area; or when the proportion of the user equipment adopting the single-stream mode transmission is less than or equal to the second threshold value, determining that the user equipment is in the central area.
However, when the user operates in the 1-port transmission mode, the user cannot determine the current location of the user equipment in this way because the user operates in a single stream only.
Specifically, when the ue operates in the N-port transmission mode, the ue may operate in a single-stream mode and a multi-stream mode, and the basis for the ue to select the single-stream mode or the multi-stream mode is as follows: and respectively calculating the spectral efficiency when a single-flow mode and a multi-flow mode work according to the SINR value, and selecting the mode with higher spectral efficiency as the current working mode. The SINR value of the edge area is low, the frequency spectrum efficiency is higher than that of the multi-flow mode by adopting a single-flow mode, when the proportion of the single-flow mode transmission adopted by the user equipment is higher than a second threshold value, the user equipment is positioned in the edge area of the cell, otherwise, the user equipment is positioned in the central area.
Specifically, the processor 501 may detect a proportion of the single stream mode transmission adopted by the ue in the total transmission duration by:
the processor 501 records the transmission duration of the user equipment using the single stream mode in the transmission process;
and calculating the proportion of the transmission time length of the single-flow mode to the total transmission time length to obtain the proportion of the transmission time length of the user equipment in the total transmission time length by adopting the single-flow mode.
The total transmission duration may be a set value, for example, when the transmission duration using the single-stream mode is detected, a detection period may be determined, and the transmission duration using the single-stream mode is detected in the period, where the period is the total transmission duration.
Further, the processor 501 is further configured to configure the transmission mode of the user equipment as a 1-port transmission mode when the user equipment accesses the cell.
The embodiment of the invention switches the transmission mode of the user equipment to the N-port transmission mode by detecting that the position of the user equipment in a cell is a central area or an edge area, and configures N CSI-RS ports for the user equipment when the user equipment works in the 1-port transmission mode and is in the central area, and switches the transmission mode of the user equipment to the 1-port transmission mode when the user equipment works in the N-port transmission mode and is in the edge area, so that the user equipment in the central area adopts the N-port transmission mode to transmit data and obtains the spatial multiplexing gain of multiple antennas; the user equipment in the edge area transmits data by adopting a 1-port transmission mode, and the pilot frequency transmission interference is reduced.
It should be noted that: in the foregoing embodiment, when the base station switches the transmission mode, only the division of the functional modules is described as an example, and in practical application, the function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the embodiments of the base station and the transmission mode switching method provided by the embodiments belong to the same concept, and specific implementation processes thereof are described in the embodiments of the methods for details, which are not described herein again.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
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 that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (12)
- A method for transmission mode switching, the method comprising:a base station acquires a current transmission mode of user equipment, wherein the transmission mode comprises a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the base station configures N signal state information reference signal (CSI-RS) ports for the user equipment, wherein N is 2, 4 or 8, and the number of N is equal to the number of antennas of a cell where the user equipment is located;the base station detects the position of the user equipment in the cell, wherein the position comprises a central area and an edge area;when the user equipment is currently working in the 1-port transmission mode and the user equipment is located in the central area, the base station switches the transmission mode of the user equipment to the N-port transmission mode, configures N CSI-RS ports for the user equipment, and notifies the N-port transmission mode and the N CSI-RS ports to the user equipment; alternatively, the first and second electrodes may be,when the user equipment is currently working in the N port transmission mode and the user equipment is in the edge area, the base station switches the transmission mode of the user equipment to the 1 port transmission mode and notifies the 1 port transmission mode to the user equipment.
- The method of claim 1, wherein the detecting the location of the user equipment in the cell comprises:detecting a spectral efficiency of the user equipment;when the spectrum efficiency of the user equipment is greater than a first threshold value, determining that the user equipment is located in the central area; alternatively, the first and second electrodes may be,when the spectrum efficiency of the user equipment is smaller than or equal to the first threshold value, determining that the user equipment is in the edge area.
- The method of claim 2, wherein the detecting the spectral efficiency of the user equipment comprises:acquiring the channel quality sent by the user equipment;and calculating the spectrum efficiency of the user equipment according to the channel quality.
- The method of claim 1, wherein the detecting the location of the user equipment in the cell comprises:when the user equipment works in the N-port transmission mode currently, detecting the proportion of the user equipment adopting single-stream mode transmission in the total transmission time;when the proportion of the user equipment adopting single-flow mode transmission is larger than a second threshold value, determining that the user equipment is in the edge area; alternatively, the first and second electrodes may be,and when the proportion of the user equipment adopting single-flow mode transmission is less than or equal to the second threshold value, determining that the user equipment is in the central area.
- The method of claim 4, wherein the detecting a proportion of a total transmission duration for the UE using single stream mode transmission comprises:recording the transmission duration of the user equipment using a single stream mode in the transmission process;and calculating the proportion of the transmission time length of the single-flow mode to the total transmission time length to obtain the proportion of the transmission time length of the user equipment in the total transmission time length by adopting the single-flow mode.
- The method according to any one of claims 1 to 5, further comprising:when the user equipment accesses a cell, configuring the transmission mode of the user equipment as the 1-port transmission mode.
- A base station, characterized in that the base station comprises:the receiving and sending module is used for communicating with the user equipment;an obtaining module, configured to obtain a current transmission mode of the ue, where the transmission mode includes a 1-port transmission mode and an N-port transmission mode, and for the N-port transmission mode, the ue is configured with N CSI-RS ports, where N is 2, 4, or 8, and the number of N is equal to the number of antennas in a cell where the ue is located;a detecting module, configured to detect a location of the user equipment in the cell, where the location includes a center area and an edge area;a processing module, configured to switch a transmission mode of the ue to the N-port transmission mode when the ue is currently operating in the 1-port transmission mode and the ue is located in the central area, configure N CSI-RS ports for the ue, and notify the N-port transmission mode and the N CSI-RS ports to the ue through the transceiver module; alternatively, the first and second electrodes may be,when the user equipment works in the N port transmission mode currently and the user equipment is in the edge area, switching the transmission mode of the user equipment to the 1 port transmission mode, and notifying the 1 port transmission mode to the user equipment through the transceiver module.
- The base station of claim 7, wherein the detection module comprises:a first detecting unit, configured to detect a spectrum efficiency of the user equipment;a first determining unit, configured to determine that the user equipment is located in the central area when the spectral efficiency of the user equipment is greater than a first threshold; alternatively, the first and second electrodes may be,when the spectrum efficiency of the user equipment is smaller than or equal to the first threshold value, determining that the user equipment is in the edge area.
- The base station of claim 8, wherein the first detecting unit comprises:an obtaining subunit, configured to obtain, through the transceiver module, channel quality sent by the user equipment;a first calculating subunit, configured to calculate a spectral efficiency of the user equipment according to the channel quality.
- The base station of claim 7, wherein the detection module comprises:a second detecting unit, configured to detect, when the ue currently operates in the N-port transmission mode, a ratio of single-stream mode transmission used by the ue in a total transmission duration;a second determining unit, configured to determine that the ue is in the edge area when a ratio of single-stream mode transmission adopted by the ue is greater than a second threshold; alternatively, the first and second electrodes may be,and when the proportion of the user equipment adopting single-flow mode transmission is less than or equal to the second threshold value, determining that the user equipment is in the central area.
- The base station of claim 10, wherein the second detecting unit comprises:a recording subunit, configured to record a transmission duration of a single stream mode used by the ue in a transmission process;and the second calculating subunit is configured to calculate a ratio of the transmission time length of the single-stream mode to the total transmission time length, so as to obtain a ratio of the transmission time length of the single-stream mode to the total transmission time length of the user equipment.
- The base station according to any of claims 7 to 11, wherein the processing module is further configured to configure the transmission mode of the user equipment as the 1-port transmission mode when the user equipment accesses a cell.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2014/090236 WO2016070321A1 (en) | 2014-11-04 | 2014-11-04 | Transmission mode switching method and base station |
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| CN105766024B (en) | 2019-01-15 |
| WO2016070321A1 (en) | 2016-05-12 |
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