CN108234006B

CN108234006B - Method and base station for configuring UE (user equipment) reporting PMI (PMI indication) and RI (Ri indication) in TM8 (Transmission mode)

Info

Publication number: CN108234006B
Application number: CN201611198112.8A
Authority: CN
Inventors: 刘占波; 唐明环
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-12-22
Filing date: 2016-12-22
Publication date: 2020-07-24
Anticipated expiration: 2036-12-22
Also published as: CN108234006A

Abstract

The invention discloses a method and a base station for reporting PMI and RI by UE configured in a TM8 transmission mode, wherein the method comprises the following steps: determining a current protocol version and a current transmission mode; when the current protocol version is determined to be R10 protocol version before R10-ac0 and the current transmission mode is TM8, sending an RRC reconfiguration first message to the UE in the RRC connection state; the RRC reconfiguration first message configures PMI and RI reported by the UE, and antenna information of the RRC reconfiguration first message comprises a codebook subset restriction parameter domain. According to the invention, by determining the current protocol version and the current transmission mode, for each R10 protocol version before R10-ac0, when the base station configures TM8, UE reporting PMI and RI must be configured, and the parameter domain is limited by codebook subsets, so that the problems of UE switching failure and disconnection and UE access failure caused by inconsistency of R10 protocol versions adopted by the base station and the UE are avoided.

Description

Method and base station for configuring UE (user equipment) reporting PMI (PMI indication) and RI (Ri indication) in TM8 (Transmission mode)

Technical Field

The invention relates to the technical field of communication, in particular to a method and a base station for reporting PMI and RI by UE configured in a TM8 transmission mode.

Background

A Multiple Input Multiple Output (MIMO) technique in a long Term Evolution (L ong Term Evolution, L TE) system is a multi-antenna technique, in which data-modulated outputs are mapped to different antenna ports, and Spatial Multiplexing Gain (Spatial Multiplexing Gain) is obtained by using the multipath characteristics of a channel.

Currently, L TE has 9 different transmission modes, i.e., transmission mode 1(TM1) to transmission mode 9(TM9), where the transmission mode 8(TM8) is a dual-stream multi-antenna transmission mode that extends beamforming to dual-stream transmission and implements combination of beamforming and spatial multiplexing techniques, which is proposed by the L TE R9 protocol version.

In the MIMO operation process of L TE system, an important aspect of supporting downlink channel related scheduling is that a User Equipment (UE) provides a channel state report to a base station, and the base station needs to make a scheduling decision based on the channel state report.

CQI: the quality of the signal emitted by each antenna beam;

RI: number of data transmission layers (i.e. number of beams of antenna)

PMI: the space vector weights of the beams of each antenna determine the correspondence from the layer data streams to the antenna ports.

L TE system, UE selects a proper Rank (Rank) and corresponding precoding matrix according to the measurement result of pilot signal, and then reports RI and PMI to eNodeB.

The principle and process of UE feedback CQI are as follows: the UE measures according to a pilot signal indicated by a Radio Resource Control (RRC) layer of the base station, periodically or non-periodically selects an uplink channel to report CQI, and the base station determines whether the modulation mode, the resource allocation amount and the MIMO related configuration of the UE need to be adjusted according to the CQI reported by the UE and the current resource condition of the base station.

The principle and process of UE feedback RI: after the UE performs downlink MIMO channel estimation, a rank indication RI of a channel matrix is obtained, where the RI reflects the number of data streams (stream number for short) that the current channel can allow downlink transmission. The UE feeds this RI back to the base station to indicate the number of streams that the base station can explicitly transmit.

Principle and process of UE feedback PMI: when the base station needs to adopt precoding based on a codebook, the UE estimates a downlink channel, compares the estimated channel with each code word in a set of codebooks in a traversing manner, finds out a code word with the best performance, determines a PMI (precoding matrix indicator), and feeds the PMI back to the base station; that is, the base station selects the precoding matrix with the optimal performance according to the PMI fed back by the UE. In order to save uplink bandwidth, the UE does not need to feed back a specific codebook, but feeds back a sequence number of the codebook. Further, the base station may restrict a set of precoding matrices from which the UE should select a proposed codebook, and is therefore also called codebook Subset Restriction (codebook Subset Restriction), which may avoid reporting those codebooks that are not useful in the antenna configuration used.

The reporting modes of the CQI, the PMI and the RI are notified to the UE by the RRC layer configuration of the base station, and the UE reports the CQI, the PMI and the RI based on the reporting modes of the CQI, the PMI and the RI configured by the base station and the downlink transmission mode.

In the TM8 transmission mode, the UE reporting CQI is usually necessary, and the UE reporting PMI and RI may be selectively configured according to the application needs of the base station. If the base station configures the UE to report the PMI and the RI, the UE further reconstructs and calculates a CQI value based on the selected PMI and the RI; if the base station does not configure the UE to report the PMI and the RI, the UE calculates the CQI value according to a specified algorithm; and finally determining the scheduling decision of the downlink service channel by the base station according to the reporting feedback of the UE.

The base station and the UE which are realized according to the different R10 protocol versions of 36.331 find that the problem of UE switching failure and disconnection caused by inconsistency of the R10 protocol versions of the base station and the UE exists in the application test process of the L TE existing network TM 8.

Further, in the test process of application of the L TE existing network TM8, it is found that if the UE uses TM8, the performance of downlink data service of the base station deteriorates when the base station is implemented according to the protocol version of R9 of 36.331, and the base station is implemented according to the protocol version of R10-ac0 and later, and in some network environments, the base station does not configure the UE to report the PMI and RI, and the performance of downlink data service of the base station deteriorates when the base station configures the UE to report the PMI and RI.

In summary, in the prior art, when the transmission mode of the base station is TM8, there is a problem that the UE fails to switch and drops due to inconsistency of R10 protocol versions adopted by the base station and the UE; and under different network environments, the problem that the downlink data service performance of the base station realized by the R9 protocol version and the R10-ac0 and later protocol versions needs to be optimized exists.

Disclosure of Invention

In view of the above problems, the present invention provides a method and a base station for reporting PMI and RI by a TM8 transmission mode configuration UE, which overcome the above problems or at least partially solve the above problems.

In a first aspect, the present invention provides a method for reporting PMI and RI by a TM8 transmission mode configuration UE, including the following steps:

determining a current protocol version and a current transmission mode;

when the current protocol version is determined to be R10 before R10-ac0 and the current transmission mode is TM8, sending an RRC reconfiguration first message to User Equipment (UE) in a Radio Resource Control (RRC) connection state;

the first message for RRC reconfiguration configures PMI and RI reported by the UE, and R10 protocol version dedicated antenna information antenna-R10 of the first message for RRC reconfiguration comprises codebook subset restriction parameter codebook subset restriction-R10 field.

Optionally, the method further comprises the following steps:

when the current protocol version is determined to be the protocol version after R10-ac0 and the current transmission mode is TM8, obtaining RI indication information;

if the RI indication information is first indication information, sending the RRC reconfiguration first message to the UE in the RRC connection state; wherein, the first indication information is used for indicating that the RI is normal;

if the RI indication information is second indication information, sending a RRC reconfiguration second message to the UE in the RRC connection state; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

Optionally, the method further comprises the following steps:

when the current protocol version is determined to be the R9 protocol version and the current transmission mode is determined to be TM8, obtaining RI indication information;

Optionally, after the sending the RRC reconfiguration first message to the user equipment UE in the RRC connection state, the method further includes the following steps:

performing intra-TM 8 transmission mode switching based on RI information and CQI information reported by the UE, wherein the intra-TM 8 transmission mode switching comprises: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

Optionally, after the sending the RRC reconfiguration second message to the UE in the RRC connected state, the method further includes the following steps:

performing intra-TM 8 transmission mode switching based on the CQI information reported by the UE, wherein the intra-TM 8 transmission mode switching comprises: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

In a second aspect, the present invention further provides a base station, including the following units:

a determining unit, configured to determine a current protocol version and a current transmission mode;

a first sending unit, configured to send an RRC reconfiguration first message to the user equipment UE in the radio resource control, RRC, connected state when the determining unit determines that the current protocol version is the R10 protocol version before R10-ac0 and the current transmission mode is TM 8;

Optionally, the base station further includes the following units:

a first obtaining unit, configured to obtain RI indication information when the determining unit determines that the current protocol version is a protocol version after R10-ac0 and the current transmission mode is TM 8;

a second sending unit, configured to send the RRC reconfiguration first message to the UE in the RRC connected state when the RI indication information acquired by the first acquiring unit is the first indication information; wherein, the first indication information is used for indicating that the RI is normal;

a third sending unit, configured to send an RRC reconfiguration second message to the UE in the RRC connected state when the RI indication information acquired by the first acquiring unit is the second indication information; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

Optionally, the base station further includes the following units:

a second obtaining unit, configured to obtain RI indication information when the determining unit determines that the current protocol version is an R9 protocol version and the current transmission mode is TM 8;

a fourth sending unit, configured to send the RRC reconfiguration first message to the UE in the RRC connected state if the RI indication information acquired by the second acquiring unit is the first indication information; wherein, the first indication information is used for indicating that the RI is normal;

a fifth sending unit, configured to send an RRC reconfiguration second message to the UE in the RRC connected state if the RI indication information acquired by the second acquiring unit is the second indication information; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

Optionally, the base station further includes the following units:

a first switching unit, configured to perform an intra-TM 8 transmission mode switching based on RI information and CQI information reported by the UE after the first sending unit, the second sending unit, or the fourth sending unit sends an RRC reconfiguration first message to a user equipment UE in an RRC connected state, where the intra-TM 8 transmission mode switching includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

Optionally, the base station further includes the following units:

a second switching unit, configured to perform, after the third sending unit or the fifth sending unit sends the RRC reconfiguration second message to the UE in the RRC connected state, an intra-TM 8 transmission mode switching based on CQI information reported by the UE, where the intra-TM 8 transmission mode switching includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

Compared with the prior art, the method and the base station for configuring the PMI and RI reported by the UE in the TM8 transmission mode provided by the invention have the advantages that by determining the current protocol version and the current transmission mode, for each R10 protocol version before R10-ac0, when the base station configures the TM8, the PMI and RI reported by the UE must be configured, and the base station comprises a codebook SubsetRiction-R10 domain, so that the problems of UE switching failure disconnection and UE access failure caused by inconsistency of R10 protocol versions adopted by the base station and the UE are avoided.

Further, the method and the base station for configuring the UE to report the PMI and the RI in the TM8 transmission mode provided by the present invention further acquire RI indication information for the R9 protocol version or the R10-ac0 and subsequent protocol versions by determining the current protocol version and the current transmission mode, when the RI is normal, that is, for a scenario where the channel environment is not suitable for the UE to perform the TM8 dual-flow service, the base station configures the UE to report the PMI and the RI, and after the UE reports the feedback that RI is 1, the base station performs the single-flow service processing on the UE based on the PMI and RI.

Further, the method and the base station for configuring the PMI and RI reported by the UE in the TM8 transmission mode further acquire RI indication information for the R9 protocol version or the R10-ac0 and subsequent protocol versions by determining the current protocol version and the current transmission mode, and when the RI is abnormal, namely the RI is suitable for the UE in the channel environment to perform TM8 double-current service, the base station closes the PMI and the RI reported by the UE, and the base station performs single-double-current switching processing based on the CQI reported by the UE, so that the downlink data service performance of the base station is improved.

Drawings

Fig. 1 is a flowchart of a method for reporting PMI and RI by a TM8 transmission mode configuration UE according to a first embodiment of the present invention;

fig. 2 is a flowchart of a method for reporting PMI and RI by a TM8 transmission mode configuration UE according to a second embodiment of the present invention;

fig. 3 is a flowchart of a method for reporting PMI and RI by a TM8 transmission mode configuration UE according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention.

According to the base station and the UE which are realized according to the 36.331 different R10 protocol versions, in the application test process of the L TE current network field TM8, the problem that the UE fails to be switched and drops due to the inconsistency of the adopted R10 protocol versions exists, and the problem is related to the fact that codebook subset Restriction parameters (codebook subset Restriction-R10) related to PMI are lacked in RRC reconfiguration messages sent to the UE by the base station in the switching process through analyzing test logs.

Further analysis of the related protocols reveals that R10 protocol versions before R10-ac0 contradict the definition and description of codebook subset restriction parameter codebook subset restriction-R10 field in the TM8 related antennaInfodivided-R10 (R10 protocol version-specific antenna information). For example, in the R10-a60 protocol version of 36.331, the description in the codebook subset restriction parameter is: if the UE is configured to be in a transmission mode TM8, the base station configures codebook SubsetRiction-r 10 only when the base station configures PMI and RI feedback.

And the explanation for conditional TMX (transmission mode X, X is a variable, X can be 1, 2,,, 9) in the R10-a60 protocol version is: when the transmission mode is 3, 4, 5, 6, 8, 9, codebook subsetrestion-r 10 is optional, this parameter need not occur in other scenarios.

The above descriptions are contradictory, if TM8 is adopted, the base station does not configure PMI and RI feedback, and does not configure codebook subsetrestion-r 10, but codebook subsetrestion-r 10 is necessary in TM8 transmission mode. The proposal CR1381(RP-131991) filed for this problem has a related description.

To correct the conflicting errors presented by the R10 protocol version above for the antenna information specification, the submission of proposal CR1381(RP-131991) proposes a modification to this problem. Therefore, in the R10-ac0 protocol version of 36.331 and each subsequent R10 protocol version, the TMX description for the codebook subsetrestion-R10 parameter is modified as follows, the parameter is mandatory when the transmission mode is 3, 4, 5, 6, and is mandatory when only the base station configures PMI and RI feedback when the transmission mode is 8, 9, and this parameter does not need to appear in other scenarios.

In summary, the base station and the UE implemented according to the different R10 protocol versions of 36.331 may have the following service exception problems in the TM8 usage process of the current network:

the transmission mode configured by the UE is TM8, when the base station does not configure PMI and RI feedback, that is, the base station does not configure PMI and RI feedback in an RRC reconfiguration message sent by the base station, but the RRC reconfiguration message includes a codebooksubsetransition-R10 field (that is, the uplink infoderived-R10 field is included), that is, the base station is implemented according to the R10 protocol version before R10-ac0, but if the UE is implemented according to the R10 protocol version after R10-ac0, the UE may reject such configuration of the base station because the R10 protocol version after R10-73ac 25 is in the TM8 mode, and if the base station does not configure PMI and RI feedback, the existence condition of the codebooksetransition-R10 field is not met. Resulting in a failure of the UE in handover to the base station.

The transmission mode configured by the UE is TM8, when the base station does not configure PMI and RI feedback, and the RRC reconfiguration message does not include a codebooksubsetransition-R10 domain, that is, the base station is implemented according to the R10 protocol version after R10-ac0, and the UE is implemented according to the R10 protocol version before R10-ac0, because the codebooksubsetransition-R10 field in the R10 protocol version before R10-ac0 is optional when the transmission mode is 3, 4, 5, 6, 8, 9, if the codebooksubsetransition-R10 domain does not exist, the UE rejects the configuration issued by the base station, and finally causes the UE handover failure.

Of course, the above description is directed to antennanfodified-R10, i.e., only version R10 will present the problems described above.

Further, according to a base station implemented by a 36.331R 9 protocol version and a base station implemented by a R10-ac0 protocol version and later, it is found in a L TE existing network TM8 application test process that if the UE uses TM8, in a scenario where some channel environments are not suitable for the UE to perform TM8 dual-flow service, for example, one of 2 antenna ports of the current base station has abnormal transmission power, if the UE only reports CQI and does not report PMI and RI, the base station may perform dual-flow service processing only by judging CQI, but at this time, because one channel is abnormal, it is not suitable for performing dual-flow service, the actual downlink data service performance of the base station is poor.

However, in some channel environments, it is suitable for a UE to perform a TM8 dual-stream service scenario, but after the base station configures the UE to report PMI and RI, if the UE always reports RI 1 due to some network interference and other factors, the base station makes the UE always perform a single-stream service after performing scheduling judgment based on RI 1, so that the dual-stream service duty ratio of the base station is low, and the application of the base station data service and corresponding Key Performance Indicators (KPI) are affected.

It is to be noted that, in the following, relational terms such as "first" and "second", and the like are used only to distinguish the same names, and do not imply a relationship or order between the names.

Therefore, as shown in fig. 1, the method for reporting PMI and RI by UE configured in TM8 transmission mode disclosed in this embodiment may include the following steps 101 to 102:

101. the current protocol version and the current transmission mode are determined.

The executing subject of this embodiment is a base station, and the manner of determining the current protocol version and the current transmission mode in step 101 may be that the base station finds or receives a protocol version and a transmission mode that are manually triggered or indicated, for example, an instruction carrying the protocol version and the transmission mode is sent to the base station by a network management personnel through a network management system to indicate the current protocol version and the transmission mode of the base station.

102. When the current protocol version is determined to be R10 before R10-ac0 and the current transmission mode is TM8, sending a RRC reconfiguration first message to User Equipment (UE) in a Radio Resource Control (RRC) connection state;

In this embodiment, the antennanfoderminated-r 10 of the RRC reconfiguration first message includes a codekoku bsettraffic-r 10 field, that is, the RRC reconfiguration first message carries the codekoku bsettraffic-r 10 information.

In this embodiment, as long as the current protocol version is determined to be any one of R10 protocol versions of R10 protocol versions before R10-ac0 and the transmission mode is TM8, an RRC reconfiguration first message is sent to the user equipment UE in the radio resource control RRC connected state.

It can be seen that, in the method for configuring UE reporting PMI and RI in TM8 transmission mode disclosed in this embodiment, by determining the current protocol version and the current transmission mode, for each R10 protocol version before R10-ac0, when the base station configures TM8, it must configure UE reporting PMI and RI, and include a codebook subsetrequest-R10 domain, thereby avoiding the problems of UE handover failure and drop and UE access failure caused by inconsistency of R10 protocol versions adopted by the base station and the UE.

As shown in fig. 2, the present embodiment discloses a method for reporting PMI and RI by a TM8 transmission mode configuration UE, which includes the following steps 201 to 204:

201. the current protocol version and the current transmission mode are determined.

This step is the same as step 101 shown in fig. 1, and is not described again here.

202. When the current protocol version is determined to be the protocol version after R10-ac0 and the current transmission mode is TM8, RI indication information is acquired.

In this embodiment, the manner of obtaining the RI indication information is, for example, receiving the RI indication information, and a sender of the RI indication information may be a network management system, and specifically, the RI indication information may be obtained by analyzing, by a network manager, network performance information based on a network KPI indicator, a channel environment of a base station, and/or a network optimization log. There are two types of RI indication information: first indication information for indicating that the RI is normal and second indication information for indicating that the RI is abnormal.

203. If the RI indication information is first indication information, sending the RRC reconfiguration first message to the UE in the RRC connection state; wherein the first indication information is used for indicating that the RI is normal.

In this embodiment, when the RI is normal, that is, in a scenario where the channel environment is not suitable for the UE to perform the TM8 dual-flow service, the base station configures the UE to report the PMI and the RI, and specifically, the base station sends the RRC reconfiguration first message to the UE in the RRC connected state.

204. If the RI indication information is second indication information, sending a RRC reconfiguration second message to the UE in the RRC connection state; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

In this embodiment, when the RI is abnormal, that is, when the channel environment is suitable for the UE to perform the TM8 dual stream service, the base station closes the reporting of the PMI and the RI by the UE, and specifically, the base station sends the RRC reconfiguration second message to the UE in the RRC connected state, where the reporting of the PMI and the RI by the UE is not configured, and antenna information antenna reconfiguration-r 10 of the RRC reconfiguration second message does not include a codebook subsetrequest-r 10 field.

As shown in fig. 3, the present embodiment discloses a method for reporting PMI and RI by a TM8 transmission mode configuration UE, which includes the following steps 301 to 304:

301. the current protocol version and the current transmission mode are determined.

In this embodiment, the step is the same as step 201 shown in fig. 2, and is not described herein again.

302. When the current protocol version is determined to be the R9 protocol version and the current transmission mode is determined to be TM8, obtaining RI indication information;

303. if the RI indication information is first indication information, sending the RRC reconfiguration first message to the UE in the RRC connection state; wherein, the first indication information is used for indicating that the RI is normal;

304. if the RI indication information is second indication information, sending a RRC reconfiguration second message to the UE in the RRC connection state; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

In this embodiment, except that the condition of step 302 is different from the condition of step 202 shown in fig. 2, the obtained RI indication information of the remaining

steps

301, 303, 304, and 302 is respectively the same as the obtained RI indication information of

steps

201, 203, 204, and 202 shown in fig. 2, and the descriptions of the steps in this embodiment may refer to the embodiment shown in fig. 2, which is not repeated herein.

In a specific example, after the RRC reconfiguration first message is sent to the UE in the RRC connected state in step 102 in fig. 1, step 203 in fig. 2, and step 303 in fig. 3, the following steps are included in each of the following steps, which are not shown in the figures:

It can be seen that, in the method for configuring UE reporting PMI and RI in TM8 transmission mode disclosed in this embodiment, by determining the current protocol version and the current transmission mode, for the R9 protocol version or the R10-ac0 and the subsequent protocol versions, RI indication information is further obtained, when RI is normal, that is, in a scenario where the channel environment is not suitable for the UE to perform TM8 dual-stream service, the base station configures UE reporting PMI and RI, and after the UE reports feedback that RI is 1, the base station performs single-stream service processing on the UE based on this.

In a specific example, after the RRC reconfiguration second message is sent to the UE in the RRC connected state in step 204 in fig. 2 and step 304 in fig. 3, the following steps are included in each of the following figures, which are not shown in the following figures:

It can be seen that, in the method for configuring UE reporting PMI and RI in TM8 transmission mode disclosed in this embodiment, by determining the current protocol version and the current transmission mode, for the R9 protocol version or the R10-ac0 and subsequent protocol versions, RI indication information is further obtained, when RI is abnormal, that is, for a channel environment suitable for the UE, TM8 dual-stream service is performed, the base station closes the PMI and RI reported by the UE, and the base station performs single-stream and dual-stream switching processing based on CQI reported by the UE, thereby improving downlink data service performance of the base station.

In the method for configuring the PMI and RI reported by the UE in the TM8 transmission mode disclosed in the embodiments of the above methods, by determining the current protocol version and the current transmission mode, for each R10 protocol version before R10-ac0, when the base station configures the TM8, the PMI and RI reported by the UE must be configured and include a codebook Subsetriestroction-R10 domain, thereby avoiding the problems of UE switching failure and disconnection and UE access failure caused by inconsistency of R10 protocol versions adopted by the base station and the UE.

Further, the method for configuring the PMI and RI reported by the UE in the TM8 transmission mode disclosed in the above method embodiments further obtains RI indication information for the R9 protocol version or the R10-ac0 and subsequent protocol versions by determining the current protocol version and the current transmission mode, and when the RI is normal, that is, for a scenario where the channel environment is not suitable for the UE to perform the TM8 dual-stream service, the base station configures the UE to report the PMI and RI, and after the UE reports the feedback that RI is 1, the base station performs the single-stream service processing on the UE based on the PMI and RI.

Further, the method for configuring UE reporting PMI and RI in the TM8 transmission mode disclosed in the above method embodiments further obtains RI indication information for the R9 protocol version or the R10-ac0 and subsequent protocol versions by determining the current protocol version and the current transmission mode, and when RI is abnormal, that is, for a channel environment suitable UE, performs TM8 dual-stream service, and the base station closes the PMI and RI reported by the UE, and the base station performs single-dual-stream switching processing based on the CQI reported by the UE, thereby improving the downlink data service performance of the base station.

As shown in fig. 4, the present embodiment discloses a base station, which may include the following units: a determination unit 41 and a first transmission unit 42, each unit being described as follows:

a determining unit 41, configured to determine a current protocol version and a current transmission mode;

a first sending unit 42, configured to send an RRC reconfiguration first message to the user equipment UE in the radio resource control, RRC, connected state when the determining unit determines that the current protocol version is the R10 protocol version before R10-ac0 and the current transmission mode is TM 8;

The base station disclosed in this embodiment may implement the method flow for reporting the PMI and RI by the UE configured in the TM8 transmission mode shown in fig. 1, and therefore, for the effect and description of the base station in this embodiment, reference may be made to the method embodiment shown in fig. 1, which is not described herein again.

In a specific example, the base station further includes the following units not shown in fig. 4: a first obtaining unit 43, a second sending unit 44, and a third sending unit 45, which are specifically described as follows:

a first obtaining unit 43, configured to obtain RI indication information when the determining unit 41 determines that the current protocol version is a protocol version after R10-ac0 and the current transmission mode is TM 8;

a second sending unit 44, configured to send the RRC reconfiguration first message to the UE in the RRC connected state when the RI indication information acquired by the first acquiring unit 43 is the first indication information; wherein, the first indication information is used for indicating that the RI is normal;

a third sending unit 45, configured to send an RRC reconfiguration second message to the UE in the RRC connected state when the RI indication information acquired by the first acquiring unit 43 is the second indication information; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

In a specific example, the base station further includes the following units not shown in fig. 4: a second obtaining unit 46, a fourth sending unit 47, and a fifth sending unit 48, which are specifically described as follows:

a second obtaining unit 46, configured to obtain RI indication information when the determining unit 41 determines that the current protocol version is the R9 protocol version and the current transmission mode is the TM 8;

a fourth sending unit 47, configured to send the RRC reconfiguration first message to the UE in the RRC connected state if the RI indication information acquired by the second acquiring unit 46 is the first indication information; wherein, the first indication information is used for indicating that the RI is normal;

a fifth sending unit 48, configured to send an RRC reconfiguration second message to the UE in the RRC connected state if the RI indication information acquired by the second acquiring unit 46 is the second indication information; wherein the second indication information is used for indicating that the RI is abnormal; the RRC reconfiguration second message does not configure the PMI and RI reported by the UE, and the R10 protocol version dedicated antenna information antenna-R10 of the RRC reconfiguration second message does not contain a codebook SubsetRiction-R10 domain.

In a specific example, the base station further includes the following units not shown in fig. 4: a first switching unit 49.

A first switching unit 49, configured to, after the first sending unit 42, the second sending unit 44, or the fourth sending unit 47 sends an RRC reconfiguration first message to a user equipment UE in an RRC connection state, perform an intra-TM 8 transmission mode switch based on RI information and CQI information reported by the UE, where the intra-TM 8 transmission mode switch includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

In a specific example, the base station further includes the following units not shown in fig. 4: a second switching unit 50.

A second switching unit 50, configured to perform, after the third sending unit 45 or the fifth sending unit 48 sends the RRC reconfiguration second message to the UE in the RRC connected state, an intra-TM 8 transmission mode switching based on the CQI information reported by the UE, where the intra-TM 8 transmission mode switching includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

By determining the current protocol version and the current transmission mode, for each R10 protocol version before R10-ac0, when the base station configures TM8, it must configure UE to report PMI and RI, and include a codebook subset relay-R10 domain, thereby avoiding the problems of UE handover failure and UE access failure caused by inconsistency of R10 protocol versions adopted by the base station and the UE.

Further, the base station disclosed in the above method embodiments further obtains RI indication information for the R9 protocol version or the R10-ac0 and subsequent protocol versions by determining the current protocol version and the current transmission mode, and when the RI is normal, that is, for a scenario where the channel environment is not suitable for the UE to perform the TM8 dual-flow service, the base station configures the UE to report the PMI and the RI, and after the UE reports the feedback of RI ═ 1, the base station performs the single-flow service processing on the UE based on the PMI and RI.

Further, the base station disclosed in the above method embodiments further obtains RI indication information for the R9 protocol version or the R10-ac0 and subsequent protocol versions by determining the current protocol version and the current transmission mode, and when the RI is abnormal, that is, when the RI is suitable for the UE to perform the TM8 dual-stream service for the channel environment, the base station closes the PMI and RI reported by the UE, and the base station performs the single-dual-stream switching process based on the CQI reported by the UE, thereby improving the downlink data service performance of the base station.

It will be appreciated by a person skilled in the art that the units of the embodiments may be combined into one unit and furthermore that they may be divided into a plurality of sub-units. All of the features disclosed in this specification, and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification may be replaced by an alternative feature serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

It will be appreciated by a person skilled in the art that the units of the embodiments may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for reporting PMI and RI by UE configured in TM8 transmission mode is characterized by comprising the following steps:

determining a current protocol version and a current transmission mode;

2. The method according to claim 1, characterized in that the method further comprises the steps of:

3. The method according to any of claims 1 to 2, wherein after sending the RRC reconfiguration first message to the user equipment UE in the radio resource control, RRC, connected state, the method further comprises the steps of:

4. The method according to claim 2, wherein after sending the RRC reconfiguration second message to the UE in the RRC connected state, the method further comprises the steps of:

5. A base station, comprising the following elements:

6. The base station of claim 5, wherein the base station further comprises:

7. The base station of claim 5, wherein the base station further comprises:

a first switching unit, configured to, after the first sending unit sends an RRC reconfiguration first message to a user equipment UE in an RRC connected state, perform an intra-TM 8 transmission mode switching based on RI information and CQI information reported by the UE, where the intra-TM 8 transmission mode switching includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

8. The base station of claim 6, wherein the base station further comprises:

a first switching unit, configured to, after the second sending unit sends the RRC reconfiguration first message to the UE in the RRC connected state, perform an intra-TM 8 transmission mode switching based on RI information and CQI information reported by the UE, where the intra-TM 8 transmission mode switching includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.

9. The base station of claim 6, wherein the base station further comprises:

a second switching unit, configured to, after the third sending unit sends the RRC reconfiguration second message to the UE in the RRC connected state, perform an intra-TM 8 transmission mode switch based on the CQI reported by the UE, where the intra-TM 8 transmission mode switch includes: TM8 single-stream beamforming, TM8 dual-stream beamforming, and transmit diversity.