CN106792926B - Mode switching method and system and applicable base station - Google Patents

Mode switching method and system and applicable base station Download PDF

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CN106792926B
CN106792926B CN201510813261.XA CN201510813261A CN106792926B CN 106792926 B CN106792926 B CN 106792926B CN 201510813261 A CN201510813261 A CN 201510813261A CN 106792926 B CN106792926 B CN 106792926B
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mobile terminal
noise ratio
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CN106792926A (en
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董付现
孙鹏
俞岚
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Beijing Xinwei Telecom Technology Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
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Abstract

The invention provides a mode switching method, a mode switching system and a base station applicable to the mode switching system. According to the method, a base station calculates a first signal-to-noise ratio of each layer of signals corresponding to a mobile terminal in a first mode based on CSI information obtained from each layer of signals received by the mobile terminal in the first mode; estimating the CQI information of the mobile terminal for receiving the corresponding layer signal in the second mode according to the first signal-to-noise ratio and the CSI information; and determining the signal transmission speed of each layer according to the CSI information and the CQI information of the corresponding second mode, and selecting the first mode or the second mode for data transmission of the corresponding layer according to the comparison result of the signal transmission speeds of the same layer under the first mode and the second mode. The invention can avoid the data interaction with the mobile terminal during the switching period and effectively reduce the occupancy rate of the channel.

Description

Mode switching method and system and applicable base station
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a system for switching modes and a base station suitable for the method and the system.
Background
Dynamic switching between SUMIMO (Single User Multi Input and Multi output) and MUMIMO (Multi User Multi Input and Multi output) is supported in the current popular LTE system, which can bring higher system efficiency and more flexible resource scheduling. Meanwhile, the challenge of resource scheduling is brought, so that the base station can judge the resource scheduling strategy more accurately according to the reported information of the mobile terminal.
Although dynamic handover between SUMIMO and MUMIMO is supported in the LTE system, it is not perceivable to the mobile terminal, i.e., the mobile terminal does not know whether it is in the state of SUMIMO or MUMIMO. Therefore, all information of the mobile terminal is reported based on the SUMIMO condition. When the base station performs MUMIMO scheduling according to the csi (channelistate information) reported by the mobile terminal based on the summimo, the cqi (channel quality indication) information of the mobile terminal needs to be adjusted to perform better rate matching. Wherein the CSI includes CQI, PMI, RI, etc.
Currently, methods adopted by the base station for scheduling the MUMIMO by using the CQI include: terminal cooperation is needed, and the terminal always assumes MUMIMO state transmission to feed back CQI; simple CQI backoff, namely, fixed reduction of CQI of a mobile terminal by several orders of MUMIMO loss in MUMIMO scheduling, is performed by a base station
The scheme required to be supported by the mobile terminal has insufficient support in the protocol, and meanwhile, the base station simply performs CQI backoff and does not fully utilize the channel information of the mobile terminal, so that the system capacity is lost.
Disclosure of Invention
The invention provides a mode switching method and system and a base station applicable to the mode switching method and system, which are used for solving the problem that interaction steps of the base station during the mode switching period are too redundant in the prior art.
Based on the above object, the present invention provides a mode switching method, comprising: calculating a first signal-to-noise ratio of each layer of signals corresponding to a mobile terminal in a first mode based on CSI information of each layer of signals received by the mobile terminal in the first mode; estimating the CQI information of the mobile terminal for receiving the corresponding layer signal in the second mode according to the first signal-to-noise ratio and the CSI information; and determining the signal transmission speed of each layer according to the CSI information and the CQI information of the second mode of the corresponding layer, and selecting the first mode or the second mode for data transmission of the corresponding layer according to the comparison result of the signal transmission speeds of the same layer under the first mode and the second mode.
Preferably, the estimating, based on CSI information obtained from each layer of signals received by the mobile terminal in the first mode, a first signal-to-noise ratio of each layer of signals corresponding to the mobile terminal in the first mode includes: and calculating each first signal-to-noise ratio corresponding to the CSI information of each layer of signals received by the mobile terminal in the first mode according to the preset mapping relation of CQI-SINR.
Preferably, the estimating, according to the first snr and the corresponding CSI information, the CQI information of the layer signal received by the mobile terminal in the second mode includes: estimating a second signal-to-noise ratio of the mobile terminal for receiving the corresponding layer signal in a second mode based on preset minimum inter-stream interference and the first signal-to-noise ratio of each layer; and calculating the CQI information corresponding to the second signal-to-noise ratio of each layer according to the preset mapping relation of the CQI-SINR.
Preferably, the estimating, based on the preset minimum inter-stream interference, the first signal-to-noise ratio of each layer, and PMI information in the corresponding CSI information, a second signal-to-noise ratio of the mobile terminal for receiving a signal of a corresponding layer in the second mode includes: according toFormula (II)
Figure BDA0000853960390000021
Estimating a second signal-to-noise ratio of the mobile terminal receiving the corresponding layer signal in a second mode; wherein the content of the first and second substances,
Figure BDA0000853960390000022
the second signal-to-noise ratio of the kth layer is K, and the K is the mobile terminal; the number of layers of the data to be transmitted,
Figure BDA0000853960390000023
is the first signal-to-noise ratio of the k layer, G is the equalization matrix, i is the number of the mobile terminal i, HiChannel of ith mobile terminal, MiPrecoding for the ith mobile terminal, ViAnd k is a vector corresponding to the PMI fed back by the ith mobile terminal in the first mode, and k is a k-th layer in the first mode and a k-th layer in the second mode.
Preferably, the equation is
Figure BDA0000853960390000024
The method for estimating the second signal-to-noise ratio of the mobile terminal receiving the corresponding layer signal in the second mode comprises the following steps: based on the preset normalized signal power of each layer after equalization, the formula is used
Figure BDA0000853960390000025
Simplifying into:
Figure BDA0000853960390000031
and estimating a second signal-to-noise ratio of each layer by using the simplified formula.
Preferably, the determining the signal transmission speed of each layer according to each CSI information and each CQI information of the corresponding second mode includes: and determining the signal transmission speed of each layer in each mode according to a preset mapping relation of CQI-transmission speed.
Based on the above object, the present invention further provides a mode switching system, including: the transmitting and receiving module is used for acquiring CSI information of each layer of signals received by the mobile terminal in a first mode; the calculation module is used for calculating a first signal-to-noise ratio of each layer of signals corresponding to the mobile terminal in a first mode based on the CSI information; the CQI information used for estimating the mobile terminal to receive the corresponding layer signal in the second mode is estimated according to the first signal-to-noise ratio and the CSI information; and the system is used for determining the signal transmission speed of each layer according to each CSI information and each corresponding CQI information; and the mode switching module is used for selecting the other transmitting and receiving module to adopt the first mode or the second mode in the data transmission of the corresponding layer according to the comparison result of the signal transmission speeds of the same layer under the determined first mode and the second mode.
Preferably, the calculation module comprises: and the first calculation submodule is used for calculating each first signal-to-noise ratio corresponding to the CSI information of each layer of signals received by the mobile terminal in the first mode according to the preset mapping relation of the CQI-SINR.
Preferably, the calculation module comprises: the second calculation submodule is used for estimating a second signal-to-noise ratio of the mobile terminal for receiving signals of a corresponding layer in a second mode based on preset minimum inter-stream interference, the first signal-to-noise ratio of each layer and PMI information in corresponding CSI information; and calculating the CQI information corresponding to the second signal-to-noise ratio of each layer according to the preset mapping relation of the CQI-SINR.
Preferably, the second calculation submodule is used for calculating according to a formula
Figure BDA0000853960390000032
Estimating a second signal-to-noise ratio of the mobile terminal receiving the corresponding layer signal in a second mode; wherein the content of the first and second substances,
Figure BDA0000853960390000033
the second signal-to-noise ratio of the kth layer is K, and the K is the mobile terminal; the number of layers of the data to be transmitted,
Figure BDA0000853960390000034
is the first signal-to-noise ratio of the k layer, G is the equalization matrix, i is the number of the mobile terminal i, HiChannel of ith mobile terminal, MiFor the pre-coding of the ith mobile terminal,Viand k is a vector corresponding to the PMI fed back by the ith mobile terminal in the first mode, and k is a k-th layer in the first mode and a k-th layer in the second mode.
Preferably, the second computation submodule is configured to normalize the formula based on preset equalized signal power of each layer
Figure BDA0000853960390000041
Simplifying into:
Figure BDA0000853960390000042
and estimating a second signal-to-noise ratio of each layer by using the simplified formula.
Preferably, the calculation module includes a third calculation submodule, configured to determine the signal transmission speed of each layer in each mode according to a preset mapping equation between CQI and transmission speed.
Based on the above object, the present invention further provides a base station, comprising: a switching system as claimed in any one of the preceding claims.
As described above, the mode switching method, system and base station applied thereto of the present invention have the following advantages: the method comprises the steps that a first signal-to-noise ratio in a first mode is used for estimating a second signal-to-noise ratio in a second mode, and then whether the modes are switched to transmit data for the mobile terminal is determined, so that data interaction with the mobile terminal during switching can be avoided, and the occupancy rate of a channel is effectively reduced; in addition, the step of acquiring related parameters through interaction with the mobile terminal can be avoided by estimating the minimum inter-stream interference of the mobile terminal, so that the redundant step of determining whether to switch the mode by the base station is reduced; and moreover, the signal power of each layer is preset to be normalized, so that the calculation amount of the base station can be reduced, the system load of the base station is reduced, and the result of the second signal-to-noise ratio is estimated efficiently, so that the mode selection can be performed quickly.
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Fig. 1 is a method flow diagram of one embodiment of a mode switching method of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of a base station of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
As shown in fig. 1, the present invention provides a mode switching method. The switching method is mainly used for the base station. The base station communicates with a plurality of mobile terminals simultaneously, and adopts a spatial multiplexing mode when transmitting data with each mobile terminal. Each channel is multiplexed to transmit multi-path data of a plurality of mobile terminals and/or transmit multi-path data of one mobile terminal, and each gap of the transmission data corresponds to one layer of the mobile terminal.
Here, the base station can perform data transmission with the mobile terminal using the first mode or the second mode. The first mode may refer to a single User Multi Input and Multi output (sumimo), i.e., a single User multiple Input multiple output (mimo) mode. The second mode may refer to a Multi-user Multi-Input Multi-Output, i.e., a Multi-user Multiple Input Multiple Output mode. The base station switches the data transmission mode with the mobile terminal by performing the following steps to achieve better configuration of scheduling resources by the base station.
In step S1, the base station estimates a first signal-to-noise ratio corresponding to each layer of signals of the mobile terminal in the first mode based on CSI information obtained from each layer of signals received by the mobile terminal in the first mode.
Here, the mobile terminal counts the channel quality of the received signal and then transmits a signal including CSI information to the base station. Wherein the mobile terminal transmits the signal in the first mode by default. And the base station determines the corresponding relation of the CSI information-mobile terminal-layer based on the spatial multiplexing layer where the acquired signal is located. By analogy, the mobile terminal sends the CSI information of each layer at regular time according to the layer of service data transmission. Correspondingly, the base station can obtain the CSI information of each layer of signals received by the same mobile terminal in the first mode. Here, the CSI information includes: CQI information (channel quality information), PMI information (precoding matrix indicator), RI information (RANK indication information), and the like.
And the base station estimates a first signal-to-noise ratio when the mobile terminal receives signals of each layer in a first mode based on the obtained CSI information.
Specifically, the base station estimates a first signal-to-noise ratio (snr) when the mobile terminal receives signals of each layer in the first mode according to a preset correspondence between CQI and SINR of each layer in the first mode.
For example, the base station presets a corresponding relationship between CQI intervals and SINRs of each layer in the first mode. And when the CQI information in the CSI received by the base station falls into a preset CQI interval of a corresponding layer, obtaining a corresponding first signal-to-noise ratio according to the corresponding relation.
Preferably, the base station calculates, according to a preset mapping relationship between CQI and SINR, first signal-to-noise ratios corresponding to CSI information obtained from the mobile terminal receiving signals of each layer in the first mode.
Specifically, taking the ith mobile terminal that the base station can communicate with as an example, the base station is preset with a mapping function of CQI-SINR:
Figure BDA0000853960390000051
wherein the content of the first and second substances,
Figure BDA0000853960390000052
CQI information of a k layer for an i mobile terminal communicating with the base station in a first mode, the
Figure BDA0000853960390000053
Is the first signal-to-noise ratio, Q, of the k layer of the ith mobile terminal in SU mode-1(. cndot.) is a mapping function.
In step S2, the base station estimates, according to the first snr and the CSI information, CQI information of a layer signal received by the mobile terminal in the second mode.
Specifically, the base station also estimates a first signal-to-noise ratio of the mobile terminal i by using a preset precoding mode with minimum inter-stream interference for each mobile terminal and a formula (1):
Figure BDA0000853960390000061
formula (1)
Obtaining the out-of-cell interference I of the mobile terminal I through the operation of the mapping relation, the CSI information and the formula (1)inter. The final value of the first snr can be determined according to the accuracy and/or according to a predetermined rounding rule. Where i is 1, 2, …, and K, where K is the number of mobile terminals communicated by the base station, G is a preset equalization matrix for each mobile terminal, and H is a preset equalization matrix for each mobile terminaliA channel for receiving signals for the ith mobile terminal in the first mode.
Preferably, the base station acquires PMI information (precoding matrix indicator) of the mobile terminal, and includes a vector V corresponding to the PMI informationiSubstituting formula (2):
Figure BDA0000853960390000062
formula (2)
Further, according to a preset precoding mode that the mobile terminal i adopts the minimum inter-stream interference, determining
Figure BDA0000853960390000063
And then estimating to obtain the formula (1).
Then, the base station obtains a second signal-to-noise ratio of the k layer of the mobile terminal i in the MU mode by using formula (3):
Figure BDA0000853960390000064
in the formula (3) in which,
Figure BDA0000853960390000065
the second signal-to-noise ratio of the kth layer is K, and the K is the mobile terminal; the number of layers of the data to be transmitted,
Figure BDA0000853960390000066
is the first signal-to-noise ratio of the k layer, G is the equalization matrix, i is the number of the mobile terminal i, HiChannel of ith mobile terminal, MiPrecoding for the ith mobile terminal, ViAnd k is a vector corresponding to the PMI fed back by the ith mobile terminal in the first mode, and k is a k-th layer in the first mode and a k-th layer in the second mode.
And obtaining the CQI information of the k layer of the mobile terminal i in the MU mode by using a mapping function of CQI-SINR.
Preferably, the step S2 includes: steps S21 and S22. (none are shown in the drawings)
In step S21, the base station estimates, based on a preset minimum inter-stream interference, the first snr of each layer, and PMI information in the corresponding CSI information, a second snr at which the mobile terminal receives signals of a corresponding layer in the second mode.
Still taking the kth layer of the ith mobile terminal as an example, the second snr formula (4) preset by the base station is:
Figure BDA0000853960390000071
formula (4)
And the base station estimates the interference between the terminals selected by the mobile terminal i and the precoding with the interference between the layers of the mobile terminal i being 0, and simplifies the formula (4) to obtain a formula (3).
Preferably, the base station further simplifies the formula (3) in order to simplify the operation. Namely: assuming that the mobile terminal i can well eliminate the inter-flow interference during the equalization, the base station presets the GHiViΛ, where Λ is a diagonal matrix. For convenience, the base station further assumes that the signal power of each layer after equalization is normalized, resulting in Λ ═ I, GHi＝(Vi HVi)- 1Vi HTherefore, the formula (3) is further simplified as:
Figure BDA0000853960390000072
and estimating a second signal-to-noise ratio of each layer by using the simplified formula.
In step S22, the base station calculates CQI information corresponding to the second snr of each layer according to a preset mapping relationship between CQI and SINR.
Specifically, the base station utilizes equation (5):
Figure BDA0000853960390000073
and obtaining the CQI information of the mobile terminal i at the k layer under the MU mode. Wherein, CQI'kCQI information at layer k for mobile i,
Figure BDA0000853960390000074
a second signal-to-noise ratio at a k-th layer for the mobile device i.
It should be noted that, the base station may estimate the CQI information of each layer of the mobile terminal i in the second mode through the execution process of step S2. Similarly, the base station may estimate CQI information of each layer of other communicable mobile terminals in the second mode by performing step S2.
In step S3, the base station determines the signal transmission speed of each layer according to each CSI information and each CQI information of the corresponding second mode, and selects the first mode or the second mode for data transmission of the corresponding layer according to the comparison result of the determined signal transmission speeds of the same layer in the first mode and the second mode.
Specifically, the base station may preset a correspondence relationship between each CQI information section and a transmission speed, and obtain respective corresponding transmission speeds according to CQI information in the obtained CSI information of each layer and CQI sections in which the CQI information corresponding to the second mode falls.
Preferably, the base station is preset with a mapping relation of CQI-transmission speed, and determines the signal transmission speed of each layer in each mode according to the mapping relation.
Here, the mapping equation of CQI-transmission speed may be the same as or similar to the preset function of the aforementioned equation CQI-SINR. The corresponding mapping relation can also be set according to different modes.
And the base station determines the signal transmission speed of each layer in each mode according to a preset mapping relation of CQI-transmission speed. And then, the mode with high transmission speed is selected to carry out data transmission with the mobile equipment i by comparing the transmission speeds of the same layer in all the modes.
As shown in fig. 2, the present invention provides a mode switching system. The handover system is installed in a base station and is performed using hardware such as an antenna, a transmission and reception module, a processor, etc. in the base station. The base station communicates with a plurality of mobile terminals simultaneously, and adopts a spatial multiplexing mode when transmitting data with each mobile terminal. Each channel is multiplexed to transmit multi-path data of a plurality of mobile terminals and/or transmit multi-path data of one mobile terminal, and each gap of the transmission data corresponds to one layer of the mobile terminal.
Here, the base station can perform data transmission with the mobile terminal using the first mode or the second mode. The first mode may refer to a single User Multi Input and Multi output (sumimo), i.e., a single User multiple Input multiple output (mimo) mode. The second mode may refer to a Multiple-User Multiple-Input Multiple-Output mode. The base station switches the data transmission mode with the mobile terminal by executing the following modules so as to realize that the base station better configures scheduling resources.
Specifically, the base station 1 includes: the device comprises a transmitting and receiving module 11, a calculating module 12 and a mode switching module 13.
The transmitting and receiving module 11 is configured to obtain CSI information of each layer of signals received by the mobile terminal in the first mode.
Here, the mobile terminal counts the channel quality of the received signal, and then transmits a signal including CSI information to the transmission/reception module 11. Wherein the mobile terminal transmits the signal in the first mode by default. The transmitting and receiving module 11 determines the CSI information-mobile terminal-layer correspondence based on the spatial multiplexing layer where the acquired signal is located. By analogy, the mobile terminal sends the CSI information of each layer at regular time according to the layer of service data transmission. Correspondingly, the transmitting and receiving module 11 can obtain CSI information of each layer of signals received by the same mobile terminal in the first mode. Here, the CSI information includes: CQI information (channel quality information), PMI information (precoding matrix indicator), RI information (RANK indication information), and the like.
Here, the transmission/reception module 11 includes, in hardware: antennas, modem devices, and the like.
The calculating module 12 is connected to the transmitting and receiving module 11, and configured to estimate, based on the obtained CSI information, a first signal-to-noise ratio when the mobile terminal receives signals of each layer in a first mode; estimating the CQI information of the mobile terminal for receiving the corresponding layer signal in the second mode according to the first signal-to-noise ratio and the corresponding CSI information; and determining the signal transmission speed of each layer according to each CSI information and each corresponding CQI information. Here, the computing module 12 includes, in hardware: processors, memory, etc. associated with the circuitry and chips that run the programs.
Specifically, according to the operation sequence of the calculation module 12, the calculation module 12 includes: the device comprises a first calculation submodule, a second calculation submodule and a third calculation submodule. (none are shown in the drawings)
The first calculation submodule is used for estimating a first signal-to-noise ratio when the mobile terminal receives signals of each layer in a first mode according to the corresponding relation between CQI and SINR (signal-to-noise ratio) of each layer in the preset first mode.
For example, the first calculation sub-module pre-sets a corresponding relationship between the CQI interval and the SINR of each layer in the first mode. And when the CQI information in the CSI received by the first calculation submodule falls into a preset CQI interval of a corresponding layer, obtaining a corresponding first signal-to-noise ratio according to the corresponding relation.
Preferably, the first calculating sub-module is configured to calculate, according to a preset mapping relationship between CQI and SINR, first signal-to-noise ratios corresponding to CSI information obtained from the mobile terminal for receiving signals of each layer in the first mode.
Specifically, taking the ith mobile terminal that can communicate with the first computing sub-module as an example, the first computing sub-module is preset with a mapping function of CQI-SINR:
Figure BDA0000853960390000091
wherein the content of the first and second substances,
Figure BDA0000853960390000092
CSI information of a k-th layer for an i-th mobile terminal in communication with the first computation submodule, the
Figure BDA0000853960390000093
Is the first signal-to-noise ratio, Q, of the k layer of the ith mobile terminal in SU mode-1(. cndot.) is a mapping function.
And the second calculation submodule is used for estimating the CQI information of the corresponding layer signal received by the mobile terminal in the MU mode according to the first signal-to-noise ratio.
Specifically, the second calculation sub-module also estimates, by using a pre-coding mode with minimum inter-stream interference and formula (6), that the first signal-to-noise ratio of the mobile terminal i is:
Figure BDA0000853960390000094
formula (6)
Obtaining the out-of-cell interference I of the mobile terminal I through the operation of the mapping relation, the CSI information and the formula (6)inter. The final value of the first snr can be determined according to the accuracy and/or according to a predetermined rounding rule. Where i is 1, 2, …, and K, where K is the number of mobile terminals communicated by the base station 1, G is a preset equalization matrix for each mobile terminal, and H is a preset equalization matrix for each mobile terminaliA channel for receiving signals for the ith mobile terminal in the first mode.
Preferably, the second computation submodule may further obtain PMI information (precoding matrix indicator) of the mobile terminal, and includes a vector V corresponding to the PMI informationiSubstituting equation (7):
Figure BDA0000853960390000101
formula (7)
Further, according to a preset precoding mode that the mobile terminal i adopts the minimum inter-stream interference, determining
Figure BDA0000853960390000102
And then estimating to obtain the formula (6).
Then, the second calculating sub-module obtains a second signal-to-noise ratio of the mobile terminal i at the k-th layer in the MU mode by using a formula (8):
Figure BDA0000853960390000103
formula (8); wherein the content of the first and second substances,
Figure BDA0000853960390000104
the second signal-to-noise ratio of the kth layer is K, and the K is the mobile terminal; the number of layers of the data to be transmitted,
Figure BDA0000853960390000105
is the first signal-to-noise ratio of the k layer, G is the equalization matrix, i is the number of the mobile terminal i, HiChannel of ith mobile terminal, MiPrecoding for the ith mobile terminal, ViAnd k is a vector corresponding to the PMI fed back by the ith mobile terminal in the first mode, and k is a k-th layer in the first mode and a k-th layer in the second mode.
And obtaining the CQI information of the k layer of the mobile terminal i in the MU mode by using a mapping function of CQI-SINR.
Preferably, the second calculation sub-module is configured to estimate a second signal-to-noise ratio of the mobile terminal receiving the corresponding layer signal in the second mode based on a preset minimum inter-stream interference and the first signal-to-noise ratio of each layer.
Still taking the kth layer of the ith mobile terminal as an example, the second signal-to-noise ratio formula (9) preset by the second calculating submodule is as follows:
Figure BDA0000853960390000106
formula (9)
And the second calculation submodule estimates the interference between the terminals selected by the mobile terminal i and the pre-coding of which the interference between the layers of the mobile terminal i is 0, and simplifies the formula (9) to obtain a formula (8).
Preferably, the second calculation submodule further simplifies equation (8) in order to simplify the operation. Namely: assuming that the mobile terminal i can well eliminate inter-stream interference during equalization, the second computation submodule presets the GHiViΛ, where Λ is a diagonal matrix. For convenience, the second computation submodule further assumes that the signal power of each layer after equalization is normalized, resulting in Λ ═ I, GHi＝(Vi HVi)-1Vi HTherefore, the formula (8) is further simplified as:
Figure BDA0000853960390000111
and estimating a second signal-to-noise ratio of each layer by using the simplified formula.
And continuously, the second calculating submodule is used for calculating the CQI information corresponding to the second signal-to-noise ratio of each layer according to a preset mapping relationship between CQI and SINR.
Specifically, the second calculation submodule utilizes equation (10):
Figure BDA0000853960390000112
and obtaining the CQI information of the mobile terminal i at the k layer under the second mode. Wherein, CQI'kCQI information at layer k for mobile i,
Figure BDA0000853960390000113
a second signal-to-noise ratio at a k-th layer for the mobile device i.
It should be noted that, the second calculating sub-module may estimate CQI information of each layer of the mobile terminal i in the second mode through the foregoing execution process. Similarly, the second calculating sub-module estimates the CQI information of each layer of other communicable mobile terminals in the second mode through the foregoing implementation process.
And the third calculation submodule is used for determining the signal transmission speed of each layer according to each CSI information and each CQI information of the corresponding second mode.
Specifically, the third calculation submodule may preset a correspondence relationship between each CQI information interval and the transmission speed, and obtain the transmission speed corresponding to each CQI information interval according to the CQI information in the obtained CSI information of each layer and the CQI interval in which the CQI information corresponding to the second mode falls.
Preferably, the third calculation submodule is preset with a mapping relation of CQI and transmission speed, and determines the signal transmission speed of each layer in each mode according to the mapping relation.
Here, the mapping equation of CQI-transmission speed may be the same as or similar to the preset function of the aforementioned equation CQI-SINR. The corresponding mapping relation can also be set according to different modes.
The mode switching module 13 is configured to select another transmitting/receiving module 11 to adopt the first mode or the second mode for data transmission in the corresponding layer according to a comparison result of the determined signal transmission speeds of the same layer in the first mode and the second mode. Here, the mode switching module 13 may be shared in hardware with the computing module 12 in whole or in part.
The mode switching module 13 determines the signal transmission speed of each layer in each mode according to a preset mapping relation of CQI-transmission speed. And then, by comparing the transmission speeds of the same layer in each mode, selecting the mode with the high transmission speed of the transmitting and receiving module 11 to perform data transmission with the mobile device i.
In summary, the present invention estimates the second signal-to-noise ratio in the second mode by using the first signal-to-noise ratio in the first mode, and further determines whether to switch the mode to transmit data for the mobile terminal, so as to avoid data interaction with the mobile terminal during the switching period and effectively reduce the occupancy rate of the channel; in addition, the step of acquiring related parameters through interaction with the mobile terminal can be avoided by estimating the minimum inter-stream interference of the mobile terminal, so that the redundant step of determining whether to switch the mode by the base station is reduced; and moreover, the signal power of each layer is preset to be normalized, so that the calculation amount of the base station can be reduced, the system load of the base station is reduced, and the result of the second signal-to-noise ratio is estimated efficiently, so that the mode selection can be performed quickly. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (11)

1. A method of mode switching, comprising:
calculating a first signal-to-noise ratio of each layer of signals corresponding to a mobile terminal in a first mode based on Channel State Information (CSI) information obtained from each layer of signals received by the mobile terminal in the first mode, wherein the calculating comprises the following steps: calculating first signal-to-noise ratios corresponding to CSI information obtained from a mobile terminal for receiving signals of all layers in a first mode according to a preset mapping relation of a Channel Quality Indicator (CQI) -signal-to-interference-and-noise ratio (SINR);
estimating the CQI information of the mobile terminal for receiving the corresponding layer signal in the second mode according to the first signal-to-noise ratio and the CSI information;
determining the signal transmission speed of each layer according to the CSI information and the CQI information of the corresponding second mode, and selecting the data transmission of the corresponding layer to adopt the first mode or the second mode according to the comparison result of the signal transmission speeds of the same layer under the first mode and the second mode;
the first mode is a single-user multiple-input multiple-output (SUMIMO) mode, and the second mode is a multi-user multiple-input multiple-output (MUMIMO) mode.
2. The method of claim 1, wherein the estimating the CQI information of the layer signal received by the mobile terminal in the second mode according to the first snr and the corresponding CSI information comprises:
estimating a second signal-to-noise ratio of the mobile terminal for receiving signals of a corresponding layer in a second mode based on preset minimum inter-stream interference, the first signal-to-noise ratio of each layer and PMI information in corresponding CSI information;
and calculating the CQI information corresponding to the second signal-to-noise ratio of each layer according to the preset mapping relation of the CQI-SINR.
3. The method of claim 2, wherein the estimating a second snr of the mobile terminal receiving signals of corresponding layers in the second mode based on the pre-set minimum inter-stream interference, the first snr of each layer, and the precoding matrix indicator PMI information in the corresponding CSI information comprises:
according to the formula
Figure FDA0002196377150000011
Estimating a second signal-to-noise ratio of the mobile terminal receiving the corresponding layer signal in a second mode;
wherein the content of the first and second substances,
Figure FDA0002196377150000012
the second signal-to-noise ratio of the kth layer is obtained, and K is the number of the mobile terminals; the number of layers of the data to be transmitted,
Figure FDA0002196377150000013
is the first signal-to-noise ratio of the k layer, G is the equalization matrix, i is the number of the mobile terminal i, HiChannel of ith mobile terminal, MiPrecoding for the ith mobile terminal, ViAnd k is a vector corresponding to the PMI fed back by the ith mobile terminal in the first mode, and k is a k-th layer in the first mode and a k-th layer in the second mode.
4. The mode switching method of claim 3, wherein the formula is based on
Figure FDA0002196377150000021
Estimating the mobile terminalThe manner in which the terminal receives the second signal-to-noise ratio of the corresponding layer signal in the second mode includes:
based on the preset normalized signal power of each layer after equalization, the formula is used
Figure FDA0002196377150000022
Simplifying into:
Figure FDA0002196377150000023
and estimating a second signal-to-noise ratio of each layer by using the simplified formula.
5. The method of claim 1, wherein the determining the signal transmission rate for each layer according to the CSI information and the CQI information for the second mode of the corresponding layer comprises:
and determining the signal transmission speed of each layer in each mode according to a preset mapping relation of CQI-transmission speed.
6. A system for switching modes, comprising:
the transmitting and receiving module is used for acquiring CSI information of each layer of signals received by the mobile terminal in a first mode;
the calculation module is used for calculating a first signal-to-noise ratio of each layer of signals corresponding to the mobile terminal in a first mode based on the CSI information; the CQI information used for estimating the mobile terminal to receive the corresponding layer signal in the second mode is estimated according to the first signal-to-noise ratio and the CSI information; and determining the signal transmission speed of each layer according to the CSI information and the CQI information of the second mode of the corresponding layer;
the mode switching module is used for selecting another transmitting and receiving module to adopt a first mode or a second mode in the data transmission of the corresponding layer according to the comparison result of the signal transmission speeds of the same layer under the determined first mode and the second mode;
the calculation module comprises: the first calculation submodule is used for calculating each first signal-to-noise ratio corresponding to the CSI information of each layer of signals received by the mobile terminal in the first mode according to the preset mapping relation of CQI-SINR;
the first mode is referred to as a SUMIMO mode and the second mode is referred to as a MUMIMO mode.
7. The system for switching modes according to claim 6, wherein the calculation module comprises: the second calculation submodule is used for estimating a second signal-to-noise ratio of the mobile terminal for receiving signals of a corresponding layer in a second mode based on preset minimum inter-stream interference, the first signal-to-noise ratio of each layer and PMI information in corresponding CSI information; and calculating the CQI information corresponding to the second signal-to-noise ratio of each layer according to the preset mapping relation of the CQI-SINR.
8. The mode switching system of claim 7, wherein said second calculation submodule is configured to calculate a function of a formula
Figure FDA0002196377150000031
Estimating a second signal-to-noise ratio of the mobile terminal receiving the corresponding layer signal in a second mode;
wherein the content of the first and second substances,
Figure FDA0002196377150000032
the second signal-to-noise ratio of the kth layer is obtained, and K is the number of the mobile terminals; the number of layers of the data to be transmitted,
Figure FDA0002196377150000033
is the first signal-to-noise ratio of the k layer, G is the equalization matrix, i is the number of the mobile terminal i, HiChannel of ith mobile terminal, MiPrecoding for the ith mobile terminal, ViAnd k is a vector corresponding to the PMI fed back by the ith mobile terminal in the first mode, and k is a k-th layer in the first mode and a k-th layer in the second mode.
9. The system for switching modes of claim 8, wherein the second computing submodule is configured to balance based on a presetThe signal power of each later layer is normalized, and the formula is used
Figure FDA0002196377150000034
Simplifying into:
Figure FDA0002196377150000035
and estimating a second signal-to-noise ratio of each layer by using the simplified formula.
10. The system according to claim 6, wherein the calculation module comprises a third calculation sub-module for determining the signal transmission speed of each layer in each mode according to a preset mapping equation of CQI-transmission speed.
11. A base station, comprising:
a switching system as claimed in any one of claims 6 to 10.
CN201510813261.XA 2015-11-22 2015-11-22 Mode switching method and system and applicable base station Expired - Fee Related CN106792926B (en)

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