CN110661557B

CN110661557B - Method, device and storage medium for mode switching based on MUMIMO

Info

Publication number: CN110661557B
Application number: CN201810698256.2A
Authority: CN
Inventors: 付竹竹; 陈军; 张德坤; 姚春峰; 唐静; 张汉超
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2021-08-24
Anticipated expiration: 2038-06-29
Also published as: CN110661557A; WO2020001434A1

Abstract

The embodiment of the invention discloses a method, equipment and a storage medium for mode switching based on MUMIMO, belonging to the technical field of communication. The method comprises the following steps: distinguishing user types according to the actual channel quality of user terminal UE; determining an MUMIMO pairing gain of the UE according to the system performance after the MUMIMO pairing; and dynamically switching the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain. According to the technical scheme, the transmission mode is dynamically switched according to the actual channel quality condition of the User Equipment (UE) and by fully considering the pairing gain of MUMIMO in the selection of the downlink shared channel (PDSCH) transmission mode, and the frequency spectrum utilization rate is improved from the perspective of a system.

Description

Method, device and storage medium for mode switching based on MUMIMO

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a device, and a storage medium for mode switching based on MUMIMO.

Background

Currently, for a Physical Downlink Shared Channel (PDSCH) of an LTE-a (Long Term Evolution-Advanced, LTE-Advanced, and subsequent Evolution of LTE technology) system, a general strategy for selecting a transmission mode is: for a user terminal UE supporting TM9, the near point uses transmission mode 9(TM 9); the remote point uses transmission mode 3(TM 3); for a user terminal UE that does not support TM9 but supports TM8, the near-middle point uses transmission mode 3 and the far-end point uses transmission mode 8. By the allocation strategy, the resources of the PDSCH can be utilized to the maximum extent, and the downlink modulation transmission requirements of the near point user terminal UE and the far point user terminal UE are considered.

When the LTE-a system introduces Multi-user MIMO (Multiple-Input Multiple-Output ) technology), different UEs can share the same time-frequency domain resource, and orthogonal isolation between UEs is achieved by space division. After introducing the MUMIMO, the user terminal UE can support 4 users to share time-frequency domain resources at a near point, and compared with the qualitative improvement of downlink traffic of a single user, because only part of transmission modes (using a transmission mode of beamforming) can implement the MUMIMO, if the transmission mode cannot be timely switched to the transmission mode capable of implementing the MUMIMO, the gain after the MUMIMO pairing cannot be obtained, and thus the mode switching time of the MUMIMO is very important.

Disclosure of Invention

The embodiments of the present invention mainly aim to provide a method, a device, and a storage medium for mode switching based on MUMIMO, which aim to dynamically switch transmission modes in selection of a downlink shared channel (PDSCH) transmission mode according to actual channel quality conditions of a user equipment UE and by fully considering pairing gains of MUMIMO, and improve spectrum utilization from a system perspective.

In order to achieve the above object, an embodiment of the present invention provides a method for mode switching based on MUMIMO, where the method includes: distinguishing user types according to the actual channel quality of user terminal UE; determining an MUMIMO pairing gain of the UE according to the system performance after the MUMIMO pairing; and dynamically switching the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain.

In order to achieve the above object, an embodiment of the present invention further provides an apparatus for mode switching based on MUMIMO, where the apparatus includes a memory, a processor, a program stored in the memory and executable on the processor, and a data bus for implementing connection communication between the processor and the memory, and the program implements the steps of the foregoing method when executed by the processor.

To achieve the above object, the present invention provides a storage medium for a computer-readable storage, the storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the steps of the aforementioned method.

The method, the equipment and the storage medium for switching the mode based on the MUMIMO firstly distinguish the user types according to the actual channel quality of the user terminal UE, secondly determine the MUMIMO pairing gain of the UE according to the system performance after the MUMIMO pairing, and finally dynamically switch the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain. Therefore, in the technical scheme, the transmission mode is dynamically switched according to the actual channel quality condition of the User Equipment (UE) and by fully considering the pairing gain of the MUMIMO in the selection of the downlink shared channel (PDSCH) transmission mode, and the frequency spectrum utilization rate is improved from the perspective of a system.

Drawings

Fig. 1 is a flowchart of a method for mode switching based on MUMIMO according to an embodiment of the present invention.

Fig. 2 is a block diagram of a system apparatus for mode switching based on MUMIMO according to an embodiment of the present invention.

Fig. 3 is a detailed flowchart of step S120 of the method for switching modes based on MUMIMO shown in fig. 1.

Fig. 4 is a block diagram of an apparatus for mode switching based on MUMIMO according to a second embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no peculiar meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

The first embodiment.

As shown in fig. 1, the present embodiment provides a method for mode switching based on MUMIMO, which includes the following steps:

step S110: the user types are distinguished according to the actual channel quality of the user terminal UE.

Specifically, the method for switching modes based on MUMIMO in the implementation of the present invention is mainly implemented based on the system apparatus for switching modes based on MUMIMO as shown in fig. 2, and the system apparatus mainly includes the following modules: the channel quality information collecting module 110 is mainly used for collecting actual channel quality information of the user equipment UE. The user type determining module 120 determines which user type of the near, medium, and far point users the UE belongs to, mainly according to the actual channel quality of the user terminal UE acquired by the channel quality information acquiring module 110. The MUMIMO pairing gain calculation module 130 is mainly used for calculating the system gain caused by MUMIMO pairing. The functional response module 140 switches transmission modes dynamically mainly according to the user type of the UE and the MUMIMO pairing gain.

The user types of the user terminal UE include a near point user, a middle point user, and a far point user. In the embodiment of the present invention, the actual channel quality of the UE is mainly characterized by a Sum of new transmission block sizes (first upload) TBSize scheduled by the UE within a first preset time, that is, the actual channel quality of the UE depends on the Sum of new transmission block sizes TBSize scheduled by the UE within the first preset time, where the larger the value of Sum is, the better the actual channel quality of the UE is. For the near point user, the middle point user and the far point user, the size relationship among Sum1 of the near point user, Sum2 of the middle point user and Sum3 of the far point user is: sum1 is greater than Sum2 is greater than Sum3, namely three value spaces are divided in sequence according to the possible values of Sum, the value interval with the largest value belongs to the near-point user, the value interval with the larger value belongs to the middle-point user, and the value interval with the smallest value belongs to the far-point user. During operation, the channel quality information acquisition module 110 acquires actual channel quality information of the UE, and the user type decision module 120 determines which user type of the near, medium, and far-point users the UE belongs to according to a value range in which the acquired actual channel quality of the UE falls.

The actual Channel Quality of the UE is represented by the Sum of the size of the newly transmitted (first-time uploaded) transport block TBSize scheduled by the UE within the first preset time, and the index fully considers the CQI (Channel Quality Indicator) and HARQ (Hybrid Automatic Repeat reQuest) feedback results reported by the UE.

In addition, for those skilled in the art, the index characterizing the actual channel Quality of the UE further includes any one or more of reference Signal received power rsrp (reference Signal Receiving power), channel Quality indicator cqi (channel Quality indicator), Signal to Interference plus Noise ratio sinr (Signal to Interference plus Noise ratio), and modulation and Coding scheme mcs (modulation and Coding scheme). The reference signal received power RSRP is one of key parameters that can represent radio signal strength in an LTE network and physical layer measurement requirements, and is an average value of signal powers received on all REs (resource elements) that carry reference signals within a certain symbol, and the unit is: dBm. And sequentially dividing three value spaces according to the possible values of the RSRP, wherein the value interval with the largest value belongs to near-point users, the value interval with the larger value belongs to middle-point users, and the value interval with the smallest value belongs to far-point users. The channel quality indicator CQI is an information indicator of channel quality, represents the quality of the current channel, corresponds to the signal-to-noise ratio of the channel, and has a value range of 0-15, when the value of the CQI is 0, the channel quality is the worst, when the value of the CQI is 15, the channel quality is the best, and the common value is 7-15. And the Node B determines the size of a transmission data block, the number of HS-PDSCH channel codes, a coding mode and a modulation mode according to the size of the CQI. The signal-to-noise-plus-interference ratio SINR is the ratio of the strength of a received useful signal to the strength of a received interfering signal (noise and interference), and can be simply understood as "signal-to-noise ratio". The rate configuration in LTE is realized by the index value of the modulation and coding strategy MCS. The MCS forms a rate table with the MCS index as a row and the columns of the table as the factors that affect the communication rate concerned. Therefore, each MCS index actually corresponds to a physical transmission rate under a set of parameters. The above indexes themselves also have relevance, for example: the larger the SINR, the better the signal-to-noise ratio can be represented, and the higher the MCS scheduled.

Step S120: and determining the MUMIMO pairing gain of the UE according to the system performance after the MUMIMO pairing.

Specifically, the index representing the system performance after the MUMIMO pairing includes any one or more of a system throughput rate, a block error rate BLER, a spectrum utilization rate, and a pairing rate of the UE participating in the MUMIMO pairing within a second preset time. In the implementation of the present invention, the pairing rate of the UE participating in the MUMIMO pairing within the second preset time is preferably used as the MUMIMO pairing gain of the UE. During operation, the MUMIMO pairing gain calculation module 130 calculates a system gain caused by MUMIMO pairing, that is, calculates a pairing rate of the UE participating in the MUMIMO pairing within a second preset time as the MUMIMO pairing gain of the UE.

Step S130: and dynamically switching the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain.

Specifically, the output results of step S110 and step S120 are combined to determine the timing for the UE to perform the transmission mode switching. That is, the function response module 140 dynamically switches the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain. The concrete embodiment is as follows:

step S131: if the user type of the UE is a remote user and the MUMIMO pairing gain of the UE is equal to or greater than a first threshold, issuing a reconfiguration signaling to the UE to notify the UE to switch from the transmission mode TM3 to the transmission mode TM 8.

Step S132: and if the user type of the UE is a midpoint user or a near point user and the MUMIMO pairing gain of the UE is smaller than a first threshold value, issuing a reconfiguration signaling to the UE to inform the UE of switching from a transmission mode TM8 to a transmission mode TM 3.

Specific examples are as follows:

1. and the remote point UE is switched from the TM3 to the TM8, and when the UE belongs to a remote point user and the MUMIMO pairing gain of the UE is equal to or larger than a first threshold value, the base station issues reconfiguration signaling to the UE to inform the UE to switch from the TM3 to the TM8 by using a transmission mode. This first threshold value takes into account not only the user type of the UE but also the system gain that may be due to MUMIMO pairing after the UE is handed over to TM 8. Specifically, without considering the MUMIMO, the switching of the transmission mode is mainly based on the traffic gain brought to the UE after the switching, and therefore the switching to the TM8 is only performed when the TM3 traffic is poor, but not only the traffic gain of the UE but also the system gain brought by the MUMIMO pairing is considered in the switching based on the MUMIMO, so that in the case that the TM3 traffic is good but the gain brought by the MUMIMO pairing is greater, the switching to the TM8 earlier is considered to obtain the system gain brought by the MUMIMO pairing, and therefore, the first threshold value is higher than the mode switching threshold based on the summimo.

2: midpoint UE switches from TM8 to TM 3. When the UE belongs to the midpoint user and the MUMIMO pairing gain of the UE is smaller than a first threshold value, the base station issues reconfiguration signaling to the UE to inform the UE that the transmission mode is switched from TM8 to TM 3. This first threshold value takes into account not only the user type of the UE but also the system gain due to the MUMIMO pairing when the UE remains at TM 8. Specifically, in the case that the UE is in TM8 and the traffic is low, that is, although there may be system gain due to MUMIMO pairing, the traffic is too low for the UE, which may affect the communication quality of the UE, and at this time, it is considered to switch the UE from TM8 to TM 3.

3. The near point UE is handed over from TM8 to TM 3. When the UE is in a near-point user and the MUMIMO pairing gain of the UE is smaller than a first threshold (i.e., the pairing rate of the UE is smaller than the first threshold), the UE is considered to have a small MUMIMO gain brought by TM8, and the base station issues a reconfiguration signaling to the UE to notify the UE to switch from TM8 to TM3 using a transmission mode. The pairing rate of the UE fully considers the system gain due to MUMIMO when the UE is at TM 8. Specifically, in the case that the UE is at TM8, although the UE may obtain higher system performance when participating in pairing, since the probability that the UE participates in pairing is lower, it may be considered that the system gain brought by the UE participating in MUMIMO pairing is lower, and at this time, it will be considered that the UE is switched from TM8 to TM 3.

Example two

As shown in fig. 4, a second embodiment of the present invention provides an apparatus 20 for mode switching based on MUMIMO, where the apparatus 20 includes a memory 21, a processor 22, a program stored in the memory and executable on the processor, and a data bus 23 for implementing connection communication between the processor 21 and the memory 22, and when the program is executed by the processor, the following specific steps are implemented as shown in fig. 1:

Specific examples are as follows:

EXAMPLE III

A third embodiment of the present invention provides a computer-readable storage medium, where one or more programs are stored, and the one or more programs are executable by one or more processors to implement the following specific steps as shown in fig. 1:

Specific examples are as follows:

The method, the device and the storage medium for mode switching based on MUMIMO provided by the embodiment of the invention distinguish the user types according to the actual channel quality of the user terminal UE, determine the MUMIMO pairing gain of the UE according to the system performance after the MUMIMO pairing, and dynamically switch the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain. Therefore, in the technical scheme, the transmission mode is dynamically switched according to the actual channel quality condition of the User Equipment (UE) and by fully considering the pairing gain of the MUMIMO in the selection of the downlink shared channel (PDSCH) transmission mode, and the frequency spectrum utilization rate is improved from the perspective of a system.

One of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.

In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.

Claims

1. A method for mode switching based on a multiple input multiple output (MUMIMO) technology is characterized by comprising the following steps:

distinguishing user types according to the actual channel quality of user terminal UE;

determining an MUMIMO pairing gain of the UE according to the system performance after the MUMIMO pairing;

and dynamically switching the transmission mode of the UE according to the user type of the UE and the MUMIMO pairing gain.

2. The method of claim 1, wherein the user types include near point users, mid point users, and far point users.

3. The method of claim 2, wherein the actual channel quality of the UE depends on Sum of new transport block size TBSize scheduled by the UE within a first preset time, and wherein the larger the Sum, the better the actual channel quality of the UE.

4. The method of claim 3, wherein the size relationship among Sum1 of the near-point user, Sum2 of the middle-point user, and Sum3 of the far-point user is: sum1 > Sum2 > Sum 3.

5. The method of claim 1, wherein the indicator characterizing the actual channel quality of the UE comprises any one or more of reference signal received power RSRP, channel quality indicator CQI, signal-to-noise-and-interference ratio SINR, and modulation and coding scheme MCS.

6. The method of claim 1, wherein the index characterizing the system performance after MUMIMO pairing comprises any one or more of a system throughput rate, a block error rate (BLER), a spectrum utilization rate, and a pairing rate of the UE participating in the muMIMO pairing within a second predetermined time.

7. The method of claim 1, wherein the step of dynamically switching the transmission mode of the UE according to the UE user type and the MUMIMO pairing gain specifically comprises:

and if the user type of the UE is a remote point user and the MUMIMO pairing gain of the UE is equal to or larger than a first threshold value, issuing a reconfiguration signaling to the UE to inform the UE of switching from a transmission mode TM3 to a transmission mode TM 8.

8. The method of claim 7, wherein the step of dynamically switching the transmission mode of the UE according to the UE user type and the MUMIMO pairing gain further comprises:

and if the user type of the UE is a midpoint user or a near point user and the MUMIMO pairing gain of the UE is smaller than a first threshold value, issuing a reconfiguration signaling to the UE to inform the UE of switching from a transmission mode TM8 to a transmission mode TM 3.

9. An apparatus for MUMIMO-based mode switching, the apparatus comprising a memory, a processor, a program stored on the memory and executable on the processor, and a data bus for enabling connection communication between the processor and the memory, the program when executed by the processor implementing the steps of the MUMIMO-based mode switching method according to any one of claims 1-8.

10. A storage medium for computer readable storage, the storage medium storing one or more programs executable by one or more processors for performing the steps of the MUMIMO-based mode switching method of any one of claims 1-8.