WO2012171292A1 - 一种上行mimo模式间切换方法、装置及设备 - Google Patents
一种上行mimo模式间切换方法、装置及设备 Download PDFInfo
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- WO2012171292A1 WO2012171292A1 PCT/CN2011/081207 CN2011081207W WO2012171292A1 WO 2012171292 A1 WO2012171292 A1 WO 2012171292A1 CN 2011081207 W CN2011081207 W CN 2011081207W WO 2012171292 A1 WO2012171292 A1 WO 2012171292A1
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- correlation coefficient
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
Definitions
- the present invention relates to the field of wireless communication technologies, and in particular, to a method, device, and device for switching between uplink multiple input multiple output (MIMO) modes.
- MIMO multiple input multiple output
- MIMO technology is a key technology of the physical layer in Orthogonal Frequency Division Multiple Access (OFDMA) technology.
- MIMO technology refers to a technology in which a signal is spatially encoded and transmitted through multiple antennas in a wireless communication system, and then received by a plurality of antennas at the receiving end after being received by the wireless channel, and then the original signal is recovered by wireless space decoding. .
- the MIMO technology application includes multiple implementations in the wireless communication system.
- the implementation includes: multiple diversity technologies such as a transmit diversity mode, a spatial multiplexing mode, and a beamforming mode.
- multi-antenna receive diversity which is limited by the number of antennas and capabilities of the terminal.
- Uplink MIMO mainly studies transmit diversity and spatial multiplexing.
- Various multi-antenna implementations are directed to different wireless channel environments. For example, when the spatial correlation between two streams of MIMO of a wireless channel is low, the system adopts spatial multiplexing to obtain better spectrum utilization and ensure transmission. Performance; When the spatial correlation between the two streams of MIMO is high, the system adopts the transmit diversity method to obtain better transmission performance.
- the communication system can adaptively switch between different multi-antenna techniques depending on the conditions of the current channel.
- the present invention provides an uplink MIMO inter-mode handover method, apparatus, and device, and provides a handover method for an uplink MIMO system to obtain better transmission performance.
- the present invention provides an uplink MIMO mode switching method, and the method includes the following steps:
- the base station When the transmission mode adopted by the current transmission system is MIMO, the base station performs channel estimation on the received signal to determine a spatial correlation coefficient of the two uplink MIMO streams;
- the smaller value of the received signal strength indication of the two streams and the larger value of the packet error rate are selected, and the uplink MIMO switching mode is determined according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the packet error rate.
- the method further includes: the base station notifying the terminal of the determined uplink MIMO mode after the handover.
- the determining a spatial correlation coefficient of two streams of the uplink MIMO includes: performing channel estimation on the received signal, determining an estimated channel impulse response value on each of the transmitting antennas and each receiving antenna, and obtaining a pilot. a channel impulse response matrix; performing an autocorrelation operation on the channel impulse response matrix of the pilot to obtain an autocorrelation matrix of the pilot; performing eigenvalue decomposition on the autocorrelation matrix of the pilot to obtain two uplink MIMO The spatial correlation coefficient of the stream.
- the determining, according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the error packet rate, determining an uplink MIMO switching mode including:
- the comparison result according to the current uplink MIMO mode, the spatial correlation coefficient of the two streams, and the set correlation coefficient threshold, and the selected received signal strength is indicated, and the MIMO mode after the switching is determined.
- determining the switched MIMO mode includes:
- the MIMO-A mode When determining that the current uplink MIMO mode is the MIMO-A mode, comparing the spatial correlation coefficient of the two streams with the set correlation coefficient threshold; when the spatial correlation coefficient of the two streams is less than the set correlation coefficient threshold When the MIMO mode after the handover is determined to be the MIMO-B mode, when the spatial correlation coefficient of the two streams is greater than the set correlation coefficient threshold, the MIMO-A mode is maintained;
- the MIMO-A mode is not switched, or the pair is not split.
- the MIMO is not switched. — A mode, or not split.
- determining the switched MIMO mode includes:
- the MIMO-A mode is maintained, and the terminal is notified to increase the transmit power;
- the MIMO mode after the handover is determined to be the MIMO-B mode, when the spatial correlation coefficient of the two streams is less than the set correlation coefficient threshold, the selected The received signal strength indication is compared with the set intensity indication threshold, and when the selected received signal strength indication is greater than the set intensity indication threshold, the correlation threshold is decreased, and the switched
- the MIMO mode is MIMO-A mode.
- the terminal is notified to increase the transmission power and maintain the current MIMO mode.
- determining the MIMO mode after the handover includes:
- the spatial correlation coefficients of the two streams are compared with the set correlation coefficient threshold
- the terminal When the spatial correlation coefficient of the two streams is greater than the set correlation coefficient threshold, the terminal is notified to disassemble; when the spatial correlation coefficient of the two streams is less than the set correlation coefficient threshold, the selected received signal strength indication is to be selected. Comparing with the set intensity indication threshold, when the selected received signal strength indication is greater than the set intensity indication threshold, decreasing the correlation threshold, and determining to notify the terminal to disassemble, when the selected received signal strength indication is less than the setting The strength indicates a threshold, and the terminal is notified to increase the transmission power without disassembling.
- the present invention further provides an uplink MIMO inter-mode switching apparatus, where the apparatus includes: a first determining module, configured to perform channel estimation on a received signal when determining that a transmission mode adopted by a current transmission system is a MIMO mode, and determining an uplink The spatial correlation coefficient of the two streams of MIMO;
- An estimation module configured to estimate a received signal strength indicator of each current in the non-MIMO mode
- a second determining module configured to determine, according to the number of current error packets of each stream obtained by the check, and the current number of data packets of each stream obtained in the upper layer message, determining a packet error rate of each stream; For selecting a smaller value of the received signal strength indication of the two streams and a larger value of the packet error rate, determining uplink MIMO according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the error packet rate Switch mode.
- the device further includes:
- the notification module is configured to notify the terminal of the determined uplink MIMO mode after the handover.
- the first determining module is configured to perform channel estimation on the received signal, determine an estimated channel impulse response value on each of the transmitting antennas and each of the receiving antennas, and obtain a channel impulse response matrix of the pilot; Performing an autocorrelation operation on the channel impulse response matrix of the pilot to obtain an autocorrelation matrix of the pilot; performing eigenvalue decomposition on the autocorrelation matrix of the pilot to obtain spatial correlation coefficients of two streams of the uplink MIMO.
- the comparison determining module is configured to compare the selected packet error rate with a set error packet rate threshold; when the selected packet error rate is less than a set error packet rate threshold, Determining a switched MIMO mode according to a current uplink MIMO mode, and a comparison result between a spatial correlation coefficient of the two streams and a set correlation coefficient threshold; when the selected packet error rate is greater than a set error packet rate threshold And determining, according to the current uplink MIMO mode, a comparison result between the spatial correlation coefficient of the two streams and the set correlation coefficient threshold, and a comparison result between the selected received signal strength indication and the set intensity indication threshold. MIMO mode.
- the comparison determining module is configured to: when the selected error packet rate is less than the set error packet rate threshold, determine that the current uplink MIMO mode is the MIMO-A mode, and then spatially correlate the two streams The coefficient of the coefficient is compared with the set correlation coefficient threshold.
- the MIMO mode after the switching is determined to be the MIMO-B mode, when the space of the two streams
- the MIMO-A mode is maintained; when the current uplink MIMO mode is determined to be the spatial multiplexing mode, the spatial correlation coefficients of the two streams are compared with the set correlation coefficient threshold.
- the comparison determining module is configured to: when the selected packet error rate is greater than When determining the current packet error rate threshold, determining that the current uplink MIMO mode is MIMO-A mode, maintaining the MIMO-A mode, and notifying the terminal to increase the transmit power; determining that the current uplink MIMO mode is the MIMO-B mode, then the two streams are The spatial correlation coefficient is compared with the set correlation coefficient threshold.
- the switched MIMO mode is MIMO-B mode, when two streams
- the selected received signal strength indication is compared with the set intensity indication threshold, and when the selected received signal strength indication is greater than the set intensity indication threshold, the reduction is performed.
- the correlation threshold is determined, and the switched MIMO mode is determined to be a MIMO-A mode.
- the terminal is notified to increase the transmit power and maintain the current MIMO mode.
- the comparison determining module is configured to: when the selected packet error rate is greater than a set error packet rate threshold, determine that the current uplink MIMO mode is a cooperative MIMO mode, and then spatially correlate the two streams.
- the coefficient is compared with the set correlation coefficient threshold; when the spatial correlation coefficient of the two streams is greater than the set correlation coefficient threshold, the terminal is notified to disassemble, when the spatial correlation coefficient of the two streams is less than the set correlation
- the threshold value of the selected coefficient is compared with the set intensity indication threshold.
- the correlation threshold is decreased, and the notification terminal is determined to be disassembled. For example, when the selected received signal strength indication is less than the set strength indication threshold, the terminal is notified to increase the transmit power without disassembling.
- the present invention provides a base station, and the base station includes the above-described uplink MIMO inter-mode switching device.
- the present invention provides a method, a device and a device for switching between uplink MIMO modes.
- the base station performs channel estimation on the received signal to determine the spatial correlation between the two uplink MIMO streams. Coefficient; and obtain the received signal strength indication of each stream in non-MIMO mode and the packet error rate of each stream; select two streams The smaller value of the received signal strength indicator and the larger value of the packet error rate determine the uplink MIMO switching mode according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the packet error rate.
- the corresponding uplink MIMO switching mode is determined by comparing the spatial correlation coefficient of the two streams, the smaller value of the selected received signal strength indication, and the larger value of the error packet rate with the set corresponding threshold.
- FIG. 1 is a schematic diagram of a process of switching between uplink MIMO modes according to the present invention
- FIG. 2A is a schematic diagram of operation of two terminals of a single antenna in an uplink cooperative MIMO mode
- FIG. 2B is a terminal uplink MIMO-A, MIMO with dual antennas.
- – a schematic diagram of the operation of the B mode
- FIG. 3 is a schematic diagram of a handover process of an uplink MIMO mode when the selected packet error rate is less than a set error packet rate threshold according to the present invention
- FIG. 4 is a schematic diagram of a detailed process of switching between uplink MIMO modes with a packet error rate greater than a set error packet rate threshold provided by the present invention
- FIG. 5 is a schematic structural diagram of an apparatus for switching between uplink MIMO modes according to the present invention. detailed description
- FIG. 1 is a schematic flowchart of a method for switching between uplink MIMO modes according to the present invention.
- the switching process includes the following steps:
- the base station When obtaining the MIMO mode used by the current transmission system, the base station performs channel estimation on the received signal to determine a spatial correlation coefficient of the two uplink MIMO streams.
- the base station obtains the transmission mode adopted by the current transmission system by directly reading the message of the Mac To Phy.
- the base station estimates a received signal strength indication of each current stream in the non-MIMO mode.
- the base station determines a packet error rate of each stream according to the number of current error data packets of each stream obtained by the check, and according to the current data packet number of each stream acquired in the upper layer message.
- S104 Select a smaller value of the received signal strength indication of the two streams, and a larger value of the packet error rate, and determine an uplink MIMO handover according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the error packet rate. mode.
- the base station determines the uplink MIMO handover mode
- the determined handover uplink MIMO mode is also notified to the terminal.
- the method for switching between uplink MIMO modes provided by the present invention is mainly for switching between MIMO modes of two streams of uplink MIMO, and can be applied to the switching process of the MIMO mode when the two terminals of the single terminal and the two antennas adopt the MIMO mode. .
- FIG. 2A is a schematic diagram of the operation of the uplink cooperative MIMO mode of the two terminals of the single antenna
- FIG. 2B is a schematic diagram of the operation of the uplink MIMO-A and MIMO-B modes of the terminal having the dual antenna.
- two users respectively use a single antenna terminal, and after the data of two users are encoded, the corresponding two terminals transmit user data to the base station in an uplink cooperative mode.
- the user uses a dual-antenna terminal, and the terminal encodes the user data, and the obtained encoded data is transmitted to the base station through MIMO-A mode or MIMO-B mode through space-time coding.
- the multi-antenna transmission technology adopted by the Wimax system mainly has the following types: 1. Inter-working multiplexing: The terminal adopts the BLAST structure, and the space-time coding matrix is Using the transmit antenna to simultaneously transmit different signals to obtain doubled downlink traffic; 2. Uplink MIMO B and cooperative MIMO; 3, The work terminal adopts Alamouti-STC (Space Time Coding)
- the space-time coding matrix is -S l , and the repeated signals are transmitted by the antenna to obtain the diversity gain.
- collaboration can also be combined with the uplink ⁇ ⁇ or ⁇ ⁇ ⁇ .
- Different multi-antenna technology applications have different scenarios, and adaptive switching of multi-antenna technology can improve system performance.
- the handover process of the MIMO mode needs to be determined according to the spatial correlation coefficient of the two streams of the uplink MIMO. Specifically, determining the spatial correlation of the two streams of the uplink MIMO is performing channel estimation on the received signal, and determining each transmit antenna. And estimating a channel impulse response on each receiving antenna to obtain a channel impulse response matrix of the pilot;
- channel estimation is performed on the received signal, and different channel estimation methods may be used.
- each transmitting antenna and each receiving antenna need to be acquired.
- Channel impulse response estimate The channel impulse response estimates obtained by the transmitting antenna and the receiving antenna are written in a matrix form to obtain a channel impulse response matrix of the pilot.
- the spatial correlation coefficient of the two streams is The result of solving the condition number of the channel autocorrelation matrix.
- the channel is When the channel is uncorrelated, the autocorrelation matrix is a unit matrix, and the eigenvalues of the matrix are equal, and the obtained condition number is 1.
- the autocorrelation matrix is an all-one matrix, and the matrix has only one non-zero feature. Value, then the condition number is ⁇ .
- RSSI Received Signal Strength Indication
- the current number of error packets obtained according to the Cyclic Redundancy Check (CRC) and the current number of packets available in the upper layer information are used to obtain the current error of each stream.
- CRC Cyclic Redundancy Check
- the process of determining the corresponding MIMO switching mode may include: selecting the selected packet The rate is compared with the set error rate threshold; when the selected packet error rate is less than the set error rate threshold, the current uplink MIMO mode and the spatial correlation coefficient of the two streams are related to the setting.
- the comparison result of the coefficient of the coefficient determines the MIMO mode after the switching; when the selected packet error rate is greater than the set error rate threshold, according to the current uplink MIMO mode, the spatial correlation coefficient of the two streams, and the set
- the result of the comparison of the correlation coefficient threshold and the comparison result of the selected received signal strength indication with the set intensity indication threshold determine the MIMO mode after the switching.
- determining the switched MIMO mode includes: when determining that the current uplink MIMO mode is the MIMO-A mode, setting the spatial correlation coefficient of the two streams The correlation coefficient threshold is compared; when the spatial correlation coefficient of the two streams is less than the set correlation coefficient threshold, it is determined that the switched MIMO mode is MIMO-B mode, when the spatial correlation coefficients of the two streams are greater than When setting the correlation coefficient threshold, keep MIMO-A mode;
- the MIMO-A mode is not switched, or the pair is not split.
- the MIMO is not switched. — A mode, or not split.
- FIG. 3 is a process of switching the uplink MIMO mode when the selected packet error rate is less than the set error rate threshold, and the process includes the following steps:
- the base station When obtaining the MIMO mode used by the current transmission system, the base station performs channel estimation on the received signal to determine a spatial correlation coefficient of the two uplink MIMO streams.
- S302 Estimate the received signal strength indication of each current in the non-MIMO mode.
- S303 Determine, according to the number of current error packets of each stream obtained by the check, and the current packet number of each stream obtained in the upper layer message, determine a packet error rate of each stream.
- S304 Select a smaller value of the received signal strength indication of the two streams, and a larger value of the packet error rate.
- step S305 Compare the selected packet error rate with the set error packet rate threshold, and when the packet error rate is less than the set error packet rate threshold, and the terminal currently adopts the MIMO-A mode, proceed to step S306.
- step S309 is performed.
- step S306 Determine whether the spatial correlation coefficient of the two streams is greater than a set correlation coefficient threshold. When the determination result is yes, proceed to step S307; otherwise, proceed to step S308.
- the two stream spatial correlation coefficients are compared with the predetermined correlation coefficient threshold. If the correlation coefficients of the two streams are large, the spatial correlation between the two streams is strong, which is not suitable. MIMO mode for spatial multiplexing; conversely, if the correlation coefficients of the two streams are small, the current two streams are less correlated, which is suitable for spatial complexion. The MIMO mode used.
- the base station determines that the terminal needs to switch to the MIMO-B mode, and sends a notification message to the terminal to switch to the MIMO-B mode.
- step S309 Determine whether the spatial correlation coefficient of the two streams is greater than a set correlation coefficient threshold. When the determination result is yes, proceed to step S310; otherwise, proceed to step S311.
- the base station increases the set correlation coefficient threshold, determines that the terminal does not need to switch to the MIMO-A mode or does not perform the disassembly, and feeds back to the terminal not to switch to the MIMO-A mode or not to disassemble the notification information. .
- the base station determines that the terminal does not need to switch to the MIMO-A mode or does not perform the disassembly, and feeds back, to the terminal, the notification information that does not switch to the MIMO-A mode or does not perform the disassembly.
- the process of determining the switched MIMO mode includes: When the current uplink MIMO mode is determined to be the MIMO-A mode, the MIMO-A mode is maintained, and the terminal is notified to increase the transmit power. When determining that the current uplink MIMO mode is the MIMO-B mode, the spatial correlation coefficients and settings of the two streams are set.
- the correlation coefficient threshold is compared; when the spatial correlation coefficient of the two streams is greater than the set correlation coefficient threshold, it is determined that the switched MIMO mode is MIMO-B mode, when the spatial correlation coefficient of the two streams is less than
- the selected received signal strength indication is compared with the set intensity indication threshold, and when the selected received signal strength indication is greater than the set intensity indication threshold, the correlation threshold is decreased, and the determination is determined.
- the switched MIMO mode is MIMO-A mode, when the selected received signal strength indication is less than the set strength indication threshold, the notification End of the transmission power increase, and maintaining the current MIMO mode.
- the process of determining the post-switching MIMO mode may include: The spatial correlation coefficient is compared with the set correlation coefficient threshold; When the spatial correlation coefficient of the two streams is greater than the set correlation coefficient threshold, the terminal is notified to disassemble, and when the spatial correlation coefficient of the two streams is less than the set correlation coefficient threshold, the selected received signal strength indication is to be selected.
- FIG. 4 is a schematic diagram of a detailed process of switching between uplink multiple input multiple output MIMO modes with a packet error rate greater than a set error packet rate threshold, and the handover process includes the following steps:
- the base station determines a transmission mode used by the current transmission system in the uplink. When it is determined that the current uplink adopts the MIMO mode, the process proceeds to step S402. Otherwise, the MIMO mode switch is not performed.
- the base station obtains the transmission mode adopted by the current transmission system, which is obtained by directly reading the Mac To Phy message.
- S402 Perform channel estimation on the received signal to determine a spatial correlation coefficient of the two uplink MIMO streams.
- S403 Estimate the received signal strength indication of each current in the non-MIMO mode.
- S404 Determine, according to the number of current error packets of each stream obtained by the check, and the current packet number of each stream obtained in the upper layer message, determine a packet error rate of each stream.
- S405 Select a smaller value of the received signal strength indication of the two streams, and a larger value of the packet error rate.
- S406 Comparing the selected packet error rate with the set error packet rate threshold, and when the packet error rate is greater than the set error packet rate threshold, and the terminal currently adopts the MIMO-A mode, step S407 is performed.
- step S408 When the terminal currently adopts the MIMO-B mode, step S408 is performed, and when the terminal currently adopts the cooperative MIMO mode, step S413 is performed.
- the base station determines that the terminal needs to increase the transmit power, and does not need to switch to MIMO-B, that is, maintain the current MIMO-A mode, and notify the terminal to increase the transmit power, and keep the current MIMO-A mode.
- step S408 Determine whether the spatial correlation coefficient of the two streams is greater than a set correlation coefficient threshold. When the determination result is yes, proceed to step S409; otherwise, proceed to step S410.
- the base station determines that the terminal needs to switch to the MIMO-A mode, and sends a notification message to the terminal to switch to the MIMO A mode.
- step S410 Determine whether the currently selected RSSI is greater than the set RSSI threshold. When the determination result is yes, proceed to step S411; otherwise, proceed to step S412.
- the terminal Comparing the selected RSSI with the predetermined RSSI threshold. If the selected RSSI is large, the fading degree of the channel through which the stream passes is small, and the terminal does not need to increase the transmission power or the modulation and coding reduction step. Otherwise, the terminal needs to increase the transmission. Power or modulation coding reduced order processing.
- S411 Increase the set correlation coefficient threshold, and determine that the terminal needs to switch to the MIMO-A mode. Therefore, at this time, the base station sends the terminal to the terminal to switch to the MIMO-A mode notification information.
- S412 Determine that the terminal needs to increase the transmit power, and does not need to switch to MIMO-B, that is, maintain the current MIMO-A mode. Therefore, the base station notifies the terminal to increase the transmit power and maintain the current MIMO-A mode.
- step S413 Determine whether the spatial correlation coefficient of the two streams is greater than a set correlation coefficient threshold. When the determination result is yes, proceed to step S414; otherwise, proceed to step S415.
- S414 The base station determines that the terminal is disconnected, does not perform the cooperative MIMO mode, and sends the terminal with the notification information of the split and non-cooperative MIMO mode.
- step S415 Determine whether the currently selected RSSI is greater than the set RSSI threshold. When the determination result is yes, proceed to step S416; otherwise, proceed to step S417.
- S416 The base station increases the set correlation coefficient threshold, determines that the terminal is disconnected, does not perform the cooperative MIMO-A mode, and sends the terminal information to the terminal to disassemble and not perform the cooperative MIMO mode.
- S417 The base station determines that the terminal needs to increase the transmit power, and does not need to disassemble, notify the terminal to increase the transmit power, and maintain the current cooperative MIMO-A mode.
- FIG. 5 is a schematic structural diagram of an apparatus for switching between uplink MIMO modes according to the present disclosure.
- the apparatus includes: a first determining module 51, configured to: when acquiring a transmission mode adopted by the current transmission system into a MIMO mode, receiving a signal Performing channel estimation to determine a spatial correlation coefficient of two streams of the uplink MIMO; an estimation module 52, configured to estimate a received signal strength indication of each current in the non-MIMO mode; and a second determining module 53 configured to obtain, according to the verification, The current error packet number of each stream, and the current data packet number of each stream obtained in the upper layer message, determining the packet error rate of each stream; the comparison determining module 54 is configured to select the received signals of the two streams.
- the smaller value of the strength indication and the larger value of the packet error rate determine the uplink MIMO switching mode according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the packet error rate.
- the apparatus further includes: a notification module 55, configured to notify the terminal of the determined switched uplink MIMO mode.
- the first determining module 51 may be configured to perform channel estimation on the received signal, determine an estimated channel impulse response value on each of the transmitting antennas and each of the receiving antennas, and obtain a channel impulse response matrix of the pilot;
- the channel impulse response matrix performs an autocorrelation operation to obtain an autocorrelation matrix of the pilot; performing eigenvalue decomposition on the autocorrelation matrix of the pilot to obtain spatial correlation coefficients of the two streams of the uplink MIMO.
- the comparison determining module 54 is configured to compare the selected packet error rate with the set error packet rate threshold; when the selected packet error rate is less than the set error packet rate threshold, according to the current uplink MIMO mode And comparing the spatial correlation coefficient of the two streams with the set correlation coefficient threshold to determine the switched MIMO mode; when the selected packet error rate is greater than the set error rate threshold, according to the current uplink The MIMO mode, the comparison result of the spatial correlation coefficient between the two streams and the set correlation coefficient threshold, and the comparison result between the selected received signal strength indication and the set intensity indication threshold determine the MIMO mode after the switching.
- the comparison determining module 54 is configured to: when the selected packet error rate is less than the set error packet rate threshold, determine that the current uplink MIMO mode is the MIMO-A mode, and set the spatial correlation coefficient and the setting of the two streams.
- the correlation coefficient threshold is compared.
- the switched MIMO mode is MIMO-B mode, and the spatial correlation coefficient of the two streams is greater than
- the MIMO_A mode is maintained; when the current uplink MIMO mode is determined to be the spatial multiplexing mode, the spatial correlation coefficients of the two streams are compared with the set correlation coefficient threshold, when the two streams are When the spatial correlation coefficient is greater than the set correlation coefficient threshold, the set correlation coefficient threshold is increased, and the MIMO-A mode is not switched, or the pair is not split, when the spatial correlation coefficients of the two streams are smaller than When the correlation coefficient threshold is set, it does not switch to MIMO-A mode, or does not split.
- the comparison determining module 54 may be configured to determine that the current uplink MIMO mode is MIMO when determining that the current uplink MIMO mode is MIMO_A mode or MIMO-B mode and the selected packet error rate is greater than a set error packet rate threshold.
- the MIMO-A mode is maintained, and the terminal is notified to increase the transmit power.
- the spatial correlation coefficients of the two streams are compared with the set correlation coefficient threshold.
- the switched MIMO mode is a MIMO-B mode, when the spatial correlation coefficients of the two streams are less than a set correlation coefficient threshold, And comparing the selected received signal strength indication with the set strength indication threshold, decreasing the correlation threshold when the selected received signal strength indication is greater than the set strength indication threshold, and determining that the switched MIMO mode is MIMO—
- the terminal is notified to increase the transmission power, and Holding current MIMO mode.
- the comparison determining module 54 is configured to: when determining that the current uplink MIMO mode is a cooperative MIMO mode and the selected packet error rate is greater than a set error packet rate threshold, correlating the spatial correlation coefficients of the two streams with the setting The coefficient of the coefficient is compared, when the spatial correlation coefficient of the two streams is large When the set correlation coefficient threshold is set, the terminal is notified to be disassembled, and when the spatial correlation coefficient of the two streams is less than the set correlation coefficient threshold, the selected received signal strength indication is compared with the set intensity indication threshold.
- the correlation threshold is decreased, and the notification terminal is determined to be disassembled, and when the selected received signal strength indication is less than the set strength indication threshold, the terminal is notified to increase the transmission. Power, not split.
- the above device may be located in a base station.
- the present invention provides a method, a device and a device for switching between uplink MIMO modes.
- the base station when the transmission mode adopted by the current transmission system is MIMO, the base station performs channel estimation on the received signal to determine two uplink MIMO. The spatial correlation coefficient of the stream; and obtaining the received signal strength indication of each stream in the non-MIMO mode and the packet error rate of each stream; selecting the smaller value of the received signal strength indication of the two streams, and the packet error rate The larger value determines the uplink MIMO switching mode after the handover according to the spatial correlation coefficient of the two streams, the selected received signal strength indication, and the packet error rate.
- the uplink MIMO switching after the handover is determined by comparing the spatial correlation coefficient of the two streams, the smaller value of the selected received signal strength indication, and the larger value of the error packet rate with the set corresponding threshold. Mode, thus achieving mode switching of uplink MIMO, and thus obtaining better transmission performance.
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- Radio Transmission System (AREA)
Abstract
本发明公开了一种上行MIMO模式间切换方法、装置及设备,所述方法包括:当获取到当前传输***采用的发射方式为MIMO方式时,基站确定上行MIMO两个流的空间相关性系数,并获取每个流在非MIMO模式下的接收信号强度指示以及每个流的误包率;选择两个流的接收信号强度指示的较小值、及误包率的较大值,根据两个流的空间相关性系数、选择的接收信号强度指示以及误包率,确定相应的上行MIMO切换模式。本发明通过对两个流的空间相关性系数、选择的接收信号强度指示的较小值以及误包率的较大值与相应阈值进行比较,确定上行MIMO切换模式,实现了上行MIMO的模式切换,因此,获得了更好的传输性能。
Description
一种上行 MIMO模式间切换方法、 装置及设备 技术领域
本发明涉及无线通信技术领域, 尤其涉及一种上行多输入多输出 ( MIMO , Multiple-Input Multiple-Out-put )模式间切换方法、 装置及设备。 背景技术
MIMO技术为正交频分多址 ( OFDMA , Orthogonal Frequency Division Multiple Access )技术中物理层的关键技术。 MIMO技术是指在无线通信系 统中, 将信号进行空间编码后通过多根天线发射出去, 通过无线信道到达 接收端后, 由位于接收端的多根天线接收, 再利用无线空间解码恢复原信 号的技术。
MIMO技术应用在无线通信***中包括多种实现方式,以 WiMax*** 为例, 该实现方式包括: 发射分集方式、 空间复用方式以及波束赋型方式 等多种多天线技术。 对于接收端主要是多天线接收分集, 受限于终端的天 线数和能力。 上行 MIMO主要研究发射分集方式和空间复用方式。 各种多 天线实现方式针对的是不同的无线信道环境, 例如在无线信道的 MIMO两 个流的空间相关性较低时, ***采用空间复用方式能够获得较好的频谱利 用率, 同时保证传输性能; 在 MIMO两个流的空间相关性较高时, ***采 用发射分集方式能够获得更好的传输性能。 因此通信***可以根据当前信 道的条件在不同的多天线技术之间进行自适应的切换。
对于下行 MIMO***的切换方案已经有很多, 但受限于终端的能力, 而针对上行 MIMO***的切换, 还没有比较完善的方案。
发明内容
有鉴于此, 本发明提供了一种上行 MIMO模式间切换方法、 装置及设 备, 提供针对上行 MIMO***的切换方法, 获得更好的传输性能。
本发明提供了一种上行 MIMO模式间切换方法, 所述方法包括如下步 驟:
当获取到当前传输***采用的发射方式为 MIMO 方式时,基站对接收 信号进行信道估计, 确定上行 MIMO 两个流的空间相关性系数;
估计当前每个流在非 MIMO模式下的接收信号强度指示;
根据校验得到的每个流当前错误数据包的数量、 以及上层消息中获取 的每个流当前数据包数量, 确定每个流的误包率;
选择两个流的接收信号强度指示的较小值、 及误包率的较大值, 根据 两个流的空间相关性系数、 选择的接收信号强度指示以及误包率, 确定上 行 MIMO切换模式。
在上述方案中, 所述方法还包括: 所述基站将确定的切换后的上行 MIMO模式通知给终端。
在上述方案中,所述确定上行 MIMO 两个流的空间相关性系数,包括: 对接收信号进行信道估计, 确定每个发射天线以及每个接收天线上的 信道沖击响应估计值, 获得导频的信道沖击响应矩阵; 对所述导频的信道 沖击响应矩阵进行自相关运算, 获得导频的自相关矩阵; 对所述导频的自 相关矩阵进行特征值分解, 获得上行 MIMO 两个流的空间相关性系数。
在上述方案中, 所述根据两个流的空间相关性系数、 选择的接收信号 强度指示以及误包率, 确定上行 MIMO 切换模式, 包括:
将选择的所述误包率与设定的误包率阈值进行比较;
当选择的所述误包率小于设定的误包率阈值时, 根据当前上行 MIMO 模式、 及两个流的空间相关性系数与设定的相关性系数阈值的比较结果,
确定切换后的 MIMO模式;
当选择的所述误包率大于设定的误包率阈值时, 根据当前上行 MIMO 模式、 两个流的空间相关性系数与设定的相关性系数阈值的比较结果、 及 选择的接收信号强度指示与设定的强度指示阈值的比较结果, 确定切换后 的 MIMO模式。
在上述方案中, 所述当选择的所述误包率小于设定的误包率阈值时, 确定切换后的 MIMO模式, 包括:
当确定当前上行 MIMO模式为 MIMO— A模式时,将两个流的空间相关 性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数小 于设定的相关性系数阈值时,确定切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数大于设定的相关性系数阈值时, 保持 MIMO— A 模式;
当确定当前上行 MIMO模式为空间复用模式时, 将两个流的空间相关 性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数大 于设定的相关性系数阈值时, 增大所述设定的相关性系数阈值, 不切换到 MIMO— A模式, 或不拆对, 当两个流的空间相关性系数小于设定的相关性 系数阈值时, 不切换到 MIMO— A模式, 或不拆对。
在上述方案中, 所述当选择的所述误包率大于设定的误包率阈值时, 确定切换后的 MIMO模式包括:
当确定当前上行 MIMO模式为 MIMO— A模式时 ,保持 MIMO— A模式 , 并通知终端提高发射功率;
当确定当前上行 MIMO模式为 MIMO— B模式时, 将两个流的空间相 关性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数 大于设定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B模 式, 当两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择的
接收信号强度指示与设定的强度指示阈值进行比较, 当选择的接收信号强 度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定切换后的
MIMO模式为 MIMO— A模式, 当选择的接收信号强度指示小于设定的强度 指示阈值, 通知终端提高发射功率, 并保持当前的 MIMO模式。
在上述方案中, 所述选择的所述误包率大于设定的误包率阈值时, 确 定切换后的 MIMO模式, 包括:
当确定当前上行 MIMO模式为协作 MIMO模式,将两个流的空间相关 性系数与设定的相关性系数阈值进行比较;
当两个流的空间相关性系数大于设定的相关性系数阈值时, 通知终端 拆对; 当两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择 的接收信号强度指示与设定的强度指示阈值进行比较, 当选择的接收信号 强度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定通知终 端拆对, 当选择的接收信号强度指示小于设定的强度指示阈值, 通知终端 提高发射功率, 不拆对。
本发明还提供了一种上行 MIMO模式间切换装置, 所述装置包括: 第一确定模块, 用于当获取到当前传输***采用的发射方式为 MIMO 方式时, 对接收信号进行信道估计, 确定上行 MIMO 两个流的空间相关性 系数;
估计模块, 用于估计当前每个流在非 MIMO模式下的接收信号强度指 示;
第二确定模块, 用于根据校验得到的每个流当前的错误数据包的数量、 以及上层消息中获取的每个流当前的数据包数量, 确定每个流的误包率; 比较确定模块, 用于选择两个流的接收信号强度指示的较小值、 及误 包率的较大值, 根据两个流的空间相关性系数、 选择的接收信号强度指示 以及误包率, 确定上行 MIMO切换模式。
在上述方案中, 所述装置还包括:
通知模块, 用于将确定的切换后的上行 MIMO模式通知给终端。
在上述方案中, 所述第一确定模块, 用于对接收信号进行信道估计, 确定每个发射天线以及每个接收天线上的信道沖击响应估计值, 获得导频 的信道沖击响应矩阵; 对所述导频的信道沖击响应矩阵进行自相关运算, 获得导频的自相关矩阵; 对所述导频的自相关矩阵进行特征值分解, 获得 上行 MIMO 两个流的空间相关性系数。
在上述方案中, 所述比较确定模块, 用于将选择的所述误包率与设定 的误包率阈值进行比较; 当选择的所述误包率小于设定的误包率阈值时, 根据当前上行 MIMO模式、 及两个流的空间相关性系数与设定的相关性系 数阈值的比较结果, 确定切换后的 MIMO模式; 当选择的所述误包率大于 设定的误包率阈值时, 根据当前上行 MIMO模式、 两个流的空间相关性系 数与设定的相关性系数阈值的比较结果、 及选择的接收信号强度指示与设 定的强度指示阈值的比较结果, 确定切换后的 MIMO模式。
在上述方案中, 所述比较确定模块, 用于当选择的所述误包率小于设 定的误包率阈值时,确定当前上行 MIMO模式为 MIMO— A模式,则将两个 流的空间相关性系数与设定的相关性系数阈值进行比较, 当两个流的空间 相关性系数小于设定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数大于设定的相关性系数阈值 时, 保持 MIMO— A模式; 确定当前上行 MIMO模式为空间复用模式, 则将 两个流的空间相关性系数与设定的相关性系数阈值进行比较, 当两个流的 空间相关性系数大于设定的相关性系数阈值时, 增大所述设定的相关性系 数阈值, 不切换到 MIMO— A模式, 或不拆对, 当两个流的空间相关性系数 小于设定的相关性系数阈值时, 不切换到 MIMO— A模式, 或不拆对。
在上述方案中, 所述比较确定模块, 用于当选择的所述误包率大于设
定的误包率阈值时, 确定当前上行 MIMO模式为 MIMO— A模式, 则保持 MIMO— A模式, 并通知终端提高发射功率; 确定当前上行 MIMO模式为 MIMO— B模式, 则将两个流的空间相关性系数与设定的相关性系数阈值进 行比较, 当两个流的空间相关性系数大于设定的相关性系数阈值时, 确定 切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数小于 设定的相关性系数阈值时, 将选择的接收信号强度指示与设定的强度指示 阈值进行比较, 当选择的接收信号强度指示大于设定的强度指示阈值, 减 小所述相关性阈值,并确定切换后的 MIMO模式为 MIMO— A模式, 当选择 的接收信号强度指示小于设定的强度指示阈值, 通知终端提高发射功率, 并保持当前的 MIMO模式。
在上述方案中, 所述比较确定模块, 用于当选择的所述误包率大于设 定的误包率阈值时, 确定当前上行 MIMO模式为协作 MIMO模式, 则将两 个流的空间相关性系数与设定的相关性系数阈值进行比较; 当两个流的空 间相关性系数大于设定的相关性系数阈值时, 通知终端拆对, 当两个流的 空间相关性系数小于设定的相关性系数阈值时, 将选择的接收信号强度指 示与设定的强度指示阈值进行比较, 当选择的接收信号强度指示大于设定 的强度指示阈值, 减小所述相关性阈值, 并确定通知终端拆对, 当选择的 接收信号强度指示小于设定的强度指示阈值, 通知终端提高发射功率, 不 拆对。
本发明提供了一种基站, 所述基站包括上述上行 MIMO模式间切换装 置。
本发明提供了一种上行 MIMO模式间切换方法、 装置及设备, 当获取 到当前传输***采用的发射方式为 MIMO 方式时,基站对接收信号进行信 道估计, 确定上行 MIMO 两个流的空间相关性系数; 并获取每个流在非 MIMO模式下的接收信号强度指示以及每个流的误包率; 选择两个流的接
收信号强度指示的较小值、 及误包率的较大值, 根据两个流的空间相关性 系数、 选择的接收信号强度指示以及误包率, 确定上行 MIMO切换模式。 由于在本发明中通过对两个流的空间相关性系数、 选择的接收信号强度指 示的较小值、 以及误包率的较大值与设置的相应阈值进行比较, 确定相应 的上行 MIMO切换模式, 从而实现了上行 MIMO的模式切换, 因此, 获 得了更好的传输性能。 附图说明
此处所说明的附图用来提供对本发明的进一步理解, 构成本发明的一 部分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发 明的不当限定。 在附图中:
图 1为本发明提供的一种上行 MIMO模式间切换的过程示意图; 图 2A为单天线的两个终端采用上行协作 MIMO模式的工作示意图; 图 2B为拥有双天线的终端上行 MIMO— A、 MIMO— B模式的工作示意 图;
图 3 为本发明提供的当选择的所述误包率小于设定的误包率阈值时, 上行 MIMO模式的切换过程;
图 4为本发明提供的误包率大于设定的误包率阈值的一种上行 MIMO 模式间切换的详细过程示意图;
图 5为本发明提供的一种上行 MIMO模式间切换装置的结构示意图。 具体实施方式
为了使本发明所要解决的技术问题、 技术方案及有益效果更加清楚、 明白, 以下结合附图和实施例, 对本发明进行进一步详细说明。 应当理解, 此处所描述的具体实施例仅仅用以解释本发明, 并不用于限定本发明。
图 1为本发明提供的一种上行 MIMO模式间切换方法的流程示意图,
该切换流程包括以下步驟:
S101 : 当获取到当前传输***采用的发射方式为 MIMO 方式时, 基站 对接收信号进行信道估计, 确定上行 MIMO 两个流的空间相关性系数。
其中,基站获取到当前传输***采用的发射方式,是通过直接读取 Mac To Phy的消息得到的。
S102: 基站估计当前每个流在非 MIMO模式下的接收信号强度指示。
S103: 基站根据校验得到的每个流当前错误数据包的数量, 以及根据 上层消息中获取的每个流当前数据包数量, 确定每个流的误包率。
S104: 选择两个流的接收信号强度指示的较小值, 及误包率的较大值, 根据两个流的空间相关性系数、 选择的接收信号强度指示以及误包率, 确 定上行 MIMO切换模式。
这里, 当基站确定了上行 MIMO切换模式后, 还将确定的切换后的上 行 MIMO模式通知给终端。
本发明提供的上行 MIMO模式间切换方法,主要针对上行 MIMO两个 流的 MIMO模式间切换, 具体可以应用在单终端双天线、 以及单天线的两 个终端采用 MIMO模式时其 MIMO模式的切换过程。
图 2A为单天线的两个终端采用上行协作 MIMO模式的工作示意图, 图 2B为拥有双天线的终端上行 MIMO— A、 MIMO— B模式的工作示意图。 图 2A中, 两个用户分别采用单天线的终端, 两个用户的数据经过编码后, 其对应的两个终端通过上行协作模式将用户数据发送到基站。 图 2B中, 用 户采用双天线的终端, 该终端将用户数据进行编码后, 得到的编码后的数 据通过时空编码,通过 MIMO— A模式或 MIMO— B模式将数据发送到基站。
目前 Wimax ***上行采用的多天线发射技术主要有下面几种: 1 , 工 间复用: 终端采用 BLAST结构, 空时编码矩阵为
, 利用发射天线同 时发射不同信号,获得下行流量加倍; 2,上行 MIMO B 和协作 MIMO; 3 ,
工 终端采用 Alamouti-STC (空时编码, Space Time Coding )
Sl —
A =
方案, 空时编码矩阵为 - Sl , 利用天线发射重复的信号, 获得分集增 益。 此外, 协作 ΜΙΜΟ也可以和上行 ΜΙΜΟ— Α或者 ΜΙΜΟ— Β 结合使用。 不同的多天线技术应用的场景有所不同, 实现多天线技术的自适应切换, 能够提高***的性能。
在本发明中需要根据上行 MIMO 两个流的空间相关性系数, 确定 MIMO模式的切换过程,具体的在确定上行 MIMO 两个流的空间相关性系 对接收信号进行信道估计, 确定每个发射天线以及每个接收天线上的 信道沖击响应估计值, 获得导频的信道沖击响应矩阵;
对所述导频的信道沖击响应矩阵进行自相关运算, 获得导频的自相关 矩阵;
对所述导频的自相关矩阵进行特征值分解, 获得上行 MIMO 两个流的 空间相关性系数。
具体的, 在确定两个流的空间相关性系数时: 首先需要对接收到的信 号进行信道估计, 可以采用不同的信道估计方法, 在进行信道估计时, 需 要获取各个发射天线以及各个接收天线上的信道沖击响应估计值。 将获得 到发射天线及接收天线的信道沖击响应估计值写成矩阵的形式, 得到导频 的信道沖击响应矩阵。
对获得的导频的信道沖击响应矩阵进行自相关运算, 得出导频的信道 自相关矩阵, 对该信道自相关矩阵进行特征值求解, 则两个流的空间相关 性系数即为所述信道自相关矩阵的条件数的求解结果。
例如, 定义特征值 为满足线性方程 det(A - lI) = ()的解, 对求解得到的 特征值进行排序, 得出条件数 cond ( A )定义为 cond (A) = 。 当信道为
不相关信道时, 则自相关矩阵为一单位矩阵, 则矩阵各特征值相等, 得到 的条件数为 1 , 当信道完全相关时, 自相关矩阵为一个全 1矩阵, 则矩阵只 有一个非 0特征值, 则条件数为∞。
在获取每个流的接收信号强度指示 (RSSI, Received Signal Strength Indication )时,估计当前每个流在不进行 MIMO时可能的 RSSI,将该 RSSI 表示该流的信道的衰落性程度,其中 RSSI可以由接收信号的模方累加获得。
在获取每个流的误包率时,根据循环冗余校验( CRC , Cyclic Redundancy Check )得到的当前错误包数量, 以及上层信息中可以得到的当前数据包数 量, 得到当前每个流的误包率。
当确定了两个流的空间相关性系数后, 并选择了接收信号强度指示以 及误包率后, 根据上述三个参数确定相应的 MIMO切换模式的过程, 可以 包括: 将选择的所述误包率与设定的误包率阈值进行比较; 当选择的所述 误包率小于设定的误包率阈值时, 根据当前上行 MIMO模式、 以及两个流 的空间相关性系数与设定的相关性系数阈值的比较结果, 确定切换后的 MIMO模式; 当选择的所述误包率大于设定的误包率阈值时, 根据当前上 行 MIMO模式、 两个流的空间相关性系数与设定的相关性系数阈值的比较 结果、 以及选择的接收信号强度指示与设定的强度指示阈值的比较结果, 确定切换后的 MIMO模式。
为了便于说明, 下面根据误包率与设定的误包率阈值的不同比较结果 分别进行说明。
当选择的所述误包率小于设定的误包率阈值时, 确定切换后的 MIMO 模式包括: 当确定当前上行 MIMO模式为 MIMO— A模式时,将两个流的空 间相关性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性 系数小于设定的相关性系数阈值时,确定切换后的 MIMO模式为 MIMO— B 模式, 当两个流的空间相关性系数大于设定的相关性系数阈值时, 保持
MIMO— A模式;
当确定当前上行 MIMO模式为空间复用模式时, 将两个流的空间相关 性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数大 于设定的相关性系数阈值时, 增大所述设定的相关性系数阈值, 不切换到 MIMO— A模式, 或不拆对, 当两个流的空间相关性系数大于设定的相关性 系数阈值时, 不切换到 MIMO— A模式, 或不拆对。
图 3 为本发明在选择的所述误包率小于设定的误包率阈值时, 上行 MIMO模式的切换过程, 该过程包括以下步驟:
S301 : 当获取到当前传输***采用的发射方式为 MIMO 方式时, 基站 对接收信号进行信道估计, 确定上行 MIMO 两个流的空间相关性系数。
S302: 估计当前每个流在非 MIMO模式下的接收信号强度指示。
S303: 根据校验得到的每个流当前错误数据包的数量、 以及根据上层 消息中获取的每个流当前数据包数量, 确定每个流的误包率。
S304: 选择两个流的接收信号强度指示的较小值、 及误包率的较大值。
S305: 将选择的所述误包率与设定的误包率阈值进行比较, 并在所述 误包率小于设定的误包率阈值, 且终端当前采用 MIMO— A模式时, 进行步 驟 S306, 当终端当前采用空间复用模式时, 进行步驟 S309。
S306: 判断两个流的空间相关性系数是否大于设定的相关性系数阈值, 当判断结果为是时, 进行步驟 S307, 否则, 进行步驟 S308。
S307: 确定终端不必进行 MIMO模式的切换, 因此, 基站此时向终端 反馈不切换到 MIMO— B模式的通知信息。
根据信道相关性系数进行判别, 得到的两个流空间相关性系数与预定 的相关性系数阈值比较, 如果两个流空间相关性系数大, 说明当前两个流 的空间相关性较强, 不适合进行空间复用的 MIMO模式; 反之, 若两个流 空间相关性系数较小, 说明当前两个流空间相关性较弱, 适合进行空间复
用的 MIMO模式。
S308: 基站确定终端需要切换到 MIMO— B模式, 此时向终端发送切换 到 MIMO— B模式的通知信息。
S309: 判断两个流的空间相关性系数是否大于设定的相关性系数阈值, 当判断结果为是时, 进行步驟 S310, 否则, 进行步驟 S311。
S310: 基站增大所述设定的相关性系数阈值, 确定终端不需要切换到 MIMO— A模式或不进行拆对,并向终端反馈不切换到 MIMO— A模式或不进 行拆对的通知信息。
S311 : 基站确定终端不需要切换到 MIMO— A模式或不进行拆对, 并向 终端反馈不切换到 MIMO— A模式或不进行拆对的通知信息。
在本发明中, 当选择的所述误包率大于设定的误包率阈值且确定当前 上行 MIMO模式为 MIMO— A模式或 MIMO— B 模式时, 确定切换后的 MIMO模式的过程包括: 当确定当前上行 MIMO模式为 MIMO— A模式时 , 保持 MIMO— A模式, 并通知终端提高发射功率; 当确定当前上行 MIMO 模式为 MIMO— B模式时,将两个流的空间相关性系数与设定的相关性系数 阈值进行比较; 当两个流的空间相关性系数大于设定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数 小于设定的相关性系数阈值时, 将选择的接收信号强度指示与设定的强度 指示阈值进行比较, 当选择的接收信号强度指示大于设定的强度指示阈值, 减小所述相关性阈值,并确定切换后的 MIMO模式为 MIMO— A模式, 当选 择的接收信号强度指示小于设定的强度指示阈值, 通知终端提高发射功率, 并保持当前的 MIMO模式。
另夕卜, 在本发明中当确定当前上行 MIMO模式为协作 MIMO模式, 选 择的所述误包率大于设定的误包率阈值时, 确定切换后 MIMO模式的过程 可以包括: 将两个流的空间相关性系数与设定的相关性系数阈值进行比较;
当两个流的空间相关性系数大于设定的相关性系数阈值时, 通知终端拆对, 当两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择的接收 信号强度指示与设定的强度指示阈值进行比较, 当选择的接收信号强度指 示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定通知终端拆对, 当选择的接收信号强度指示小于设定的强度指示阈值, 通知终端提高发射 功率, 不拆对。
图 4为本发明提供的误包率大于设定的误包率阈值的一种上行多输入 多输出 MIMO模式间切换的详细过程示意图, 该切换过程包括以下几个步 驟:
S401 : 基站判断当前传输***上行采用的发射模式, 当判定当前上行 采用 MIMO模式时, 进行步驟 S402, 否则, 不进行 MIMO模式切换。
其中,基站获取到当前传输***采用的发射方式,是通过直接读取 Mac To Phy消息得到的。
S402: 对接收信号进行信道估计, 确定上行 MIMO 两个流的空间相关 性系数。
S403: 估计当前每个流在非 MIMO模式下的接收信号强度指示。
S404: 根据校验得到的每个流当前错误数据包的数量、 以及根据上层 消息中获取的每个流当前数据包数量, 确定每个流的误包率。
S405: 选择两个流的接收信号强度指示的较小值、 及误包率的较大值。 S406: 将选择的所述误包率与设定的误包率阈值进行比较, 并在所述 误包率大于设定的误包率阈值, 且终端当前采用 MIMO— A模式时, 进行步 驟 S407, 当终端当前采用 MIMO— B模式时, 进行步驟 S408, 当终端当前 采用协作 MIMO模式时, 进行步驟 S413。
S407: 基站确定终端需要提高发射功率, 且不需要切换到 MIMO— B , 即保持当前 MIMO— A 模式, 并通知终端提高发射功率, 并保持当前
MIMO— A模式。
S408: 判断两个流的空间相关性系数是否大于设定的相关性系数阈值, 当判断结果为是时, 进行步驟 S409, 否则, 进行步驟 S410。
S409: 基站确定终端需要切换到 MIMO— A模式, 并向终端发送切换到 MIMO A模式的通知信息。
S410: 判断当前选择的 RSSI是否大于设定的 RSSI阈值, 当判断结果 为是时, 进行步驟 S411 , 否则, 进行步驟 S412。
将选择的 RSSI与预定的 RSSI阈值比较,若选择的 RSSI较大,说明流 经过的信道的衰落程度较小, 不需要终端再提高发射功率或者调制编码降 阶处理; 反之, 则需要终端提高发射功率或者调制编码降阶处理。
S411 : 增大所述设定的相关性系数阈值, 并确定终端需要切换到 MIMO— A模式, 因此, 此时, 基站向终端发送切换到 MIMO— A模式的通知 信息。
S412: 确定终端需要提高发射功率, 且不需要切换到 MIMO— B , 即保 持当前 MIMO— A模式, 因此, 此时基站通知终端提高发射功率, 并保持当 前 MIMO— A模式。
S413: 判断两个流的空间相关性系数是否大于设定的相关性系数阈值, 当判断结果为是时, 进行步驟 S414, 否则, 进行步驟 S415。
S414: 基站确定终端拆对, 不进行协作 MIMO模式, 并向终端发送拆 对和不进行协作 MIMO模式的通知信息。
S415: 判断当前选择的 RSSI是否大于设定的 RSSI阈值, 当判断结果 为是时, 进行步驟 S416, 否则, 进行步驟 S417。
S416: 基站增大所述设定的相关性系数阈值, 并确定终端拆对, 不进 行协作 MIMO— A模式,并向终端发送拆对和不进行协作 MIMO模式的通知 信息。
S417: 基站确定终端需要提高发射功率, 且不需要拆对, 通知终端提 高发射功率, 并保持当前协作 MIMO— A模式。
图 5为本发明提供的一种上行 MIMO模式间切换装置的结构示意图, 所述装置包括: 第一确定模块 51 , 用于当获取到当前传输***采用的发射 方式为 MIMO 方式时, 对接收信号进行信道估计, 确定上行 MIMO 两个 流的空间相关性系数;估计模块 52,用于估计当前每个流在非 MIMO模式 下的接收信号强度指示; 第二确定模块 53 , 用于根据校验得到的每个流当 前的错误数据包的数量、 以及上层消息中获取的每个流当前的数据包数量, 确定每个流的误包率; 比较确定模块 54, 用于选择两个流的接收信号强度 指示的较小值、 及误包率的较大值, 根据两个流的空间相关性系数、 选择 的接收信号强度指示以及误包率, 确定上行 MIMO切换模式。
所述装置还包括: 通知模块 55 , 用于将确定的切换后的上行 MIMO模 式通知给终端。
第一确定模块 51 , 可以用于对接收信号进行信道估计, 确定每个发射 天线以及每个接收天线上的信道沖击响应估计值, 获得导频的信道沖击响 应矩阵; 对所述导频的信道沖击响应矩阵进行自相关运算, 获得导频的自 相关矩阵; 对所述导频的自相关矩阵进行特征值分解, 获得上行 MIMO 两 个流的空间相关性系数。
比较确定模块 54, 可以用于将选择的所述误包率与设定的误包率阈值 进行比较; 当选择的所述误包率小于设定的误包率阈值时, 根据当前上行 MIMO模式、 及两个流的空间相关性系数与设定的相关性系数阈值的比较 结果, 确定切换后的 MIMO模式; 当选择的所述误包率大于设定的误包率 阈值时, 根据当前上行 MIMO模式、 两个流的空间相关性系数与设定的相 关性系数阈值的比较结果、 及选择的接收信号强度指示与设定的强度指示 阈值的比较结果, 确定切换后的 MIMO模式。
比较确定模块 54, 可以用于当选择的所述误包率小于设定的误包率阈 值时,确定当前上行 MIMO模式为 MIMO— A模式,则将两个流的空间相关 性系数与设定的相关性系数阈值进行比较, 当两个流的空间相关性系数小 于设定的相关性系数阈值时,确定切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数大于设定的相关性系数阈值时, 保持 MIMO— A 模式; 确定当前上行 MIMO模式为空间复用模式, 则将两个流的空间相关 性系数与设定的相关性系数阈值进行比较, 当两个流的空间相关性系数大 于设定的相关性系数阈值时, 增大所述设定的相关性系数阈值, 不切换到 MIMO— A模式, 或不拆对, 当两个流的空间相关性系数小于设定的相关性 系数阈值时, 不切换到 MIMO— A模式, 或不拆对。
比较确定模块 54 , 可以用于当确定当前上行 MIMO模式为 MIMO— A 模式或 MIMO— B模式且选择的所述误包率大于设定的误包率阈值时, 确定 当前上行 MIMO模式为 MIMO— A模式时 , 则保持 MIMO— A模式 , 并通知 终端提高发射功率; 确定当前上行 MIMO模式为 MIMO— B模式, 则将两 个流的空间相关性系数与设定的相关性系数阈值进行比较, 当两个流的空 间相关性系数大于设定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B 模式, 当两个流的空间相关性系数小于设定的相关性系数阈值 时, 将选择的接收信号强度指示与设定的强度指示阈值进行比较, 当选择 的接收信号强度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并 确定切换后的 MIMO模式为 MIMO— A模式,当选择的接收信号强度指示小 于设定的强度指示阈值, 通知终端提高发射功率, 并保持当前的 MIMO模 式。
比较确定模块 54,可以用于当确定当前上行 MIMO模式为协作 MIMO 模式且选择的所述误包率大于设定的误包率阈值时, 将两个流的空间相关 性系数与设定的相关性系数阈值进行比较, 当两个流的空间相关性系数大
于设定的相关性系数阈值时, 通知终端拆对, 当两个流的空间相关性系数 小于设定的相关性系数阈值时, 将选择的接收信号强度指示与设定的强度 指示阈值进行比较, 当选择的接收信号强度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定通知终端拆对, 当选择的接收信号强度指示 小于设定的强度指示阈值, 通知终端提高发射功率, 不拆对。
具体的, 上述装置可以位于基站中。
本发明提供了一种上行 MIMO模式间切换方法、 装置及设备, 在该方 法中, 当获取到当前传输***采用的发射方式为 MIMO 方式时, 基站对接 收信号进行信道估计, 确定上行 MIMO 两个流的空间相关性系数; 并获取 每个流在非 MIMO模式下的接收信号强度指示以及每个流的误包率; 选择 两个流的接收信号强度指示的较小值、 及误包率的较大值, 根据两个流的 空间相关性系数、 选择的接收信号强度指示以及误包率, 确定切换后的上 行 MIMO切换模式。 由于在本发明中通过对两个流的空间相关性系数、 选 择的接收信号强度指示的较小值、 以及误包率的较大值与设置的相应阈值 进行比较, 确定切换后的上行 MIMO切换模式, 从而实现了上行 MIMO 的模式切换, 并由此获得了更好的传输性能。
上述说明示出并描述了本发明的一个优选实施例, 但如前所述, 应当 理解本发明并非局限于本文所披露的形式, 不应看作是对其他实施例的排 除, 而可用于各种其他组合、 修改和环境, 并能够在本文所述发明构想范 围内, 通过上述教导或相关领域的技术或知识进行改动。 而本领域人员所 进行的改动和变化不脱离本发明的精神和范围, 则都应在本发明所附权利 要求的保护范围内。
Claims
1、一种上行多输入多输出 MIMO模式间切换方法, 其特征在于, 所述 方法包括:
当获取到当前传输***采用的发射方式为 MIMO 方式时,基站对接收 信号进行信道估计, 确定上行 MIMO 两个流的空间相关性系数;
估计当前每个流在非 MIMO模式下的接收信号强度指示;
根据校验得到的每个流当前错误数据包的数量、 以及上层消息中获取 的每个流当前数据包数量, 确定每个流的误包率;
选择两个流的接收信号强度指示的较小值、 及误包率的较大值, 根据 两个流的空间相关性系数、 选择的接收信号强度指示以及误包率, 确定上 行 MIMO切换模式。
2、 如权利要求 1所述的方法, 其特征在于, 所述方法还包括: 所述基站将确定的切换后的上行 MIMO模式通知给终端。
3、 如权利要求 1所述的方法, 其特征在于, 所述确定上行 MIMO 两 个流的空间相关性系数, 包括:
对接收信号进行信道估计, 确定每个发射天线以及每个接收天线上的 信道沖击响应估计值, 获得导频的信道沖击响应矩阵; 对所述导频的信道 沖击响应矩阵进行自相关运算, 获得导频的自相关矩阵; 对所述导频的自 相关矩阵进行特征值分解, 获得上行 MIMO 两个流的空间相关性系数。
4、 如权利要求 1所述的方法, 其特征在于, 所述根据两个流的空间相 关性系数、 选择的接收信号强度指示以及误包率, 确定上行 MIMO切换模 式, 包括:
将选择的所述误包率与设定的误包率阈值进行比较;
当选择的所述误包率小于设定的误包率阈值时, 根据当前上行 MIMO 模式、 及两个流的空间相关性系数与设定的相关性系数阈值的比较结果, 确定切换后的 MIMO模式;
当选择的所述误包率大于设定的误包率阈值时, 根据当前上行 MIMO 模式、 两个流的空间相关性系数与设定的相关性系数阈值的比较结果、 及 选择的接收信号强度指示与设定的强度指示阈值的比较结果, 确定切换后 的 MIMO模式。
5、 如权利要求 4所述的方法, 其特征在于, 所述当选择的所述误包率 小于设定的误包率阈值时, 确定切换后的 MIMO模式, 包括:
当确定当前上行 MIMO模式为 MIMO— A模式时,将两个流的空间相关 性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数小 于设定的相关性系数阈值时,确定切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数大于设定的相关性系数阈值时, 保持 MIMO— A 模式;
当确定当前上行 MIMO模式为空间复用模式时, 将两个流的空间相关 性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数大 于设定的相关性系数阈值时, 增大所述设定的相关性系数阈值, 不切换到 MIMO— A模式, 或不拆对, 当两个流的空间相关性系数小于设定的相关性 系数阈值时, 不切换到 MIMO— A模式, 或不拆对。
6、 如权利要求 4所述的方法, 其特征在于, 所述当选择的所述误包率 大于设定的误包率阈值时, 确定切换后的 MIMO模式包括:
当确定当前上行 MIMO模式为 MIMO— A模式时 ,保持 MIMO— A模式 , 并通知终端提高发射功率;
当确定当前上行 MIMO模式为 MIMO— B模式时, 将两个流的空间相 关性系数与设定的相关性系数阈值进行比较; 当两个流的空间相关性系数 大于设定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B模 式, 当两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择的 接收信号强度指示与设定的强度指示阈值进行比较, 当选择的接收信号强 度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定切换后的
MIMO模式为 MIMO— A模式, 当选择的接收信号强度指示小于设定的强度 指示阈值, 通知终端提高发射功率, 并保持当前的 MIMO模式。
7、 如权利要求 4所述的方法, 其特征在于, 所述选择的所述误包率大 于设定的误包率阈值时, 确定切换后的 MIMO模式, 包括:
当确定当前上行 MIMO模式为协作 MIMO模式,将两个流的空间相关 性系数与设定的相关性系数阈值进行比较;
当两个流的空间相关性系数大于设定的相关性系数阈值时, 通知终端 拆对; 当两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择 的接收信号强度指示与设定的强度指示阈值进行比较, 当选择的接收信号 强度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定通知终 端拆对, 当选择的接收信号强度指示小于设定的强度指示阈值, 通知终端 提高发射功率, 不拆对。
8、 一种上行 MIMO模式间切换装置, 其特征在于, 所述装置包括: 第一确定模块, 用于当获取到当前传输***采用的发射方式为 MIMO 方式时, 对接收信号进行信道估计, 确定上行 MIMO 两个流的空间相关性 系数;
估计模块, 用于估计当前每个流在非 MIMO模式下的接收信号强度指 示;
第二确定模块, 用于根据校验得到的每个流当前的错误数据包的数量、 以及上层消息中获取的每个流当前的数据包数量, 确定每个流的误包率; 比较确定模块, 用于选择两个流的接收信号强度指示的较小值、 及误 包率的较大值, 根据两个流的空间相关性系数、 选择的接收信号强度指示 以及误包率, 确定上行 MIMO切换模式。
9、 如权利要求 8所述的装置, 其特征在于, 所述装置还包括: 通知模块, 用于将确定的切换后的上行 MIMO模式通知给终端。
10、 如权利要求 8所述的装置, 其特征在于, 所述第一确定模块, 用 于对接收信号进行信道估计, 确定每个发射天线以及每个接收天线上的信 道沖击响应估计值, 获得导频的信道沖击响应矩阵; 对所述导频的信道沖 击响应矩阵进行自相关运算, 获得导频的自相关矩阵; 对所述导频的自相 关矩阵进行特征值分解, 获得上行 MIMO 两个流的空间相关性系数。
11、 如权利要求 8 所述的装置, 其特征在于, 所述比较确定模块, 用 于将选择的所述误包率与设定的误包率阈值进行比较; 当选择的所述误包 率小于设定的误包率阈值时, 根据当前上行 MIMO模式、 及两个流的空间 相关性系数与设定的相关性系数阈值的比较结果, 确定切换后的 MIMO模 式; 当选择的所述误包率大于设定的误包率阈值时, 根据当前上行 MIMO 模式、 两个流的空间相关性系数与设定的相关性系数阈值的比较结果、 及 选择的接收信号强度指示与设定的强度指示阈值的比较结果, 确定切换后 的 MIMO模式。
12、 如权利要求 11所述的装置, 其特征在于, 所述比较确定模块, 用 于当选择的所述误包率小于设定的误包率阈值时, 确定当前上行 MIMO模 式为 MIMO— A模式, 则将两个流的空间相关性系数与设定的相关性系数阈 值进行比较, 当两个流的空间相关性系数小于设定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B模式, 当两个流的空间相关性系数 大于设定的相关性系数阈值时, 保持 MIMO— A模式; 确定当前上行 MIMO 模式为空间复用模式, 则将两个流的空间相关性系数与设定的相关性系数 阈值进行比较, 当两个流的空间相关性系数大于设定的相关性系数阈值时, 增大所述设定的相关性系数阈值, 不切换到 MIMO— A模式, 或不拆对, 当 两个流的空间相关性系数小于设定的相关性系数阈值时, 不切换到 MIMO— A模式, 或不拆对。
13、 如权利要求 11所述的装置, 其特征在于, 所述比较确定模块, 用 于当选择的所述误包率大于设定的误包率阈值时, 确定当前上行 MIMO模 式为 MIMO— A模式, 则保持 MIMO— A模式, 并通知终端提高发射功率; 确定当前上行 MIMO模式为 MIMO— B模式, 则将两个流的空间相关性系 数与设定的相关性系数阈值进行比较, 当两个流的空间相关性系数大于设 定的相关性系数阈值时, 确定切换后的 MIMO模式为 MIMO— B模式, 当 两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择的接收信 号强度指示与设定的强度指示阈值进行比较, 当选择的接收信号强度指示 大于设定的强度指示阈值, 减小所述相关性阈值, 并确定切换后的 MIMO 模式为 MIMO— A模式, 当选择的接收信号强度指示小于设定的强度指示阈 值, 通知终端提高发射功率, 并保持当前的 MIMO模式。
14、 如权利要求 11所述的装置, 其特征在于, 所述比较确定模块, 用 于当选择的所述误包率大于设定的误包率阈值时, 确定当前上行 MIMO模 式为协作 MIMO模式, 则将两个流的空间相关性系数与设定的相关性系数 阈值进行比较; 当两个流的空间相关性系数大于设定的相关性系数阈值时, 通知终端拆对, 当两个流的空间相关性系数小于设定的相关性系数阈值时, 将选择的接收信号强度指示与设定的强度指示阈值进行比较, 当选择的接 收信号强度指示大于设定的强度指示阈值, 减小所述相关性阈值, 并确定 通知终端拆对, 当选择的接收信号强度指示小于设定的强度指示阈值, 通 知终端提高发射功率, 不拆对。
15、 一种基站, 其特征在于, 所述基站包括如权利要求 8至 14任一所 述的装置。
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