CN106375044A

CN106375044A - Channel state information (CSI) measurement feedback method of unauthorized carrier waves, base station, and terminal

Info

Publication number: CN106375044A
Application number: CN201510437678.0A
Authority: CN
Inventors: 莫林梅; 赵亚军; 徐汉青
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-07-23
Filing date: 2015-07-23
Publication date: 2017-02-01
Also published as: WO2017012346A1

Abstract

The invention discloses a channel state information (CSI) measurement feedback method of unauthorized carrier waves, a base station, and a terminal. The method comprises the following steps: a base station sending downlink control signaling comprising transmission resource configuration information of channel measurement reference signals to a terminal, wherein the transmission resource configuration information of the channel measurement reference signals are used for determining positions of the channel measurement reference signals; and when the terminal determines the channel measurement reference signals according to the transmission resource configuration information of the channel measurement reference signals and performs channel measurement on the channel measurement reference signals, receiving a channel measurement result sent by the terminal.

Description

Channel state information measurement feedback method of unauthorized carrier, base station and terminal

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a Channel State Information (CSI) measurement feedback method for an unlicensed carrier, a base station, and a terminal.

Background

In a wireless communication system, a receiving end generally needs to perform channel measurement according to a pilot signal sent by a sending end, and feeds back measured channel information to the sending end, and the sending end uses a specific transmitting precoding technology to improve transmission performance according to the obtained channel information, such as CSI. In a Long Term Evolution (LTE) system, Channel information is obtained by measuring and Channel estimating according to a Cell Reference Signal (CRS) or a Channel State information reference signal (CSI-RS). In newer protocol versions, CSI-RS based channel measurements are mainly employed.

In the prior art, a base station may periodically send one or more sets of CSI-RSs, and a terminal performs CSI measurement using the CSI-RSs and then feeds back measured CSI to the base station. In the LTE system, CSI reflecting the downlink physical channel state may include the following: a Channel Quality Indication (CQI), a Precoding Matrix Indication (PMI), a Precoding Type Indication (PTI), and a Rank Indication (RI).

In addition, feedback of CSI may be divided into periodic feedback and aperiodic feedback. The terminal may be configured by Radio Resource Control (RRC) signaling to use a Physical Uplink Control Channel (PUCCH) for periodic CSI feedback; or triggered by the DCI or the random access response grant, the Physical Uplink Shared Channel (PUSCH) may be used for aperiodic CSI feedback.

Currently, an LTE system mainly operates on licensed carriers, and in order to support a wider frequency band, Carrier Aggregation (CA) is introduced in LTE-Advanced (LTE-a), and by aggregating a plurality of continuous or discrete carriers, a wider frequency spectrum can be supported. With the continuous increase of data traffic, licensed spectrum resources become more and more crowded and tense. Therefore, the LTE system introduces Licensed Assisted Access (LAA) technology, that is, under the assistance of a Licensed carrier, the LTE/LTE-a system is extended to an unlicensed spectrum resource by using methods such as carrier aggregation and the like. The Cell on the authorized carrier is a Primary Cell (PCell, Primary Cell), and the Cell on the unauthorized carrier is a Secondary Cell (Scell, Secondary Cell).

In the unlicensed spectrum, in addition to the LTE system, there are other systems such as wireless fidelity (WiFi) and Radar (Radar), for fairness, each node needs to obtain a channel right of use through contention, before using the channel, a Clear Channel Assessment (CCA) needs to be performed first according to the Listen before talk principle (LBT), and only if the CCA result indicates that the channel is idle, the network node can access the channel to transmit necessary reference signals and data. Generally, sending of the CSI measurement reference signal and reporting of the CSI measurement result also require first performing LBT/CCA to obtain the channel use weight.

Based on this, the problems of the prior art are mainly: due to the uncertainty of the channel of the unlicensed carrier, the CSI measurement reference signal cannot be transmitted strictly and periodically, and the CSI measurement result cannot be reported on the unlicensed carrier, that is, the existing CSI measurement and feedback mechanism cannot meet the requirement on the unlicensed carrier.

Disclosure of Invention

In order to solve the above technical problem, embodiments of the present invention provide a CSI measurement feedback method for an unlicensed carrier, a base station, and a terminal.

The CSI measurement feedback method of the unauthorized carrier provided by the embodiment of the invention comprises the following steps:

sending a downlink control signaling comprising transmission resource configuration information of a channel measurement reference signal to a terminal, wherein the transmission resource configuration information of the channel measurement reference signal is used for determining the position of the channel measurement reference signal;

and when the terminal determines the channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal and performs channel measurement on the channel measurement reference signal, receiving a channel measurement result sent by the terminal.

In this embodiment of the present invention, the channel sounding reference signal at least includes one of the following signals: CRS, CSI-RS;

determining the type of the channel measurement reference signal according to the position of the channel measurement reference signal, wherein the type of the channel measurement reference signal comprises: an opportunistic periodic channel measurement reference signal and an aperiodic channel measurement reference signal;

the opportunistic periodic channel measurement reference signals may appear in a subframe period, and Orthogonal Frequency Division Multiplexing (OFDM) symbols in each subframe are the same or different;

the subframes in which the aperiodic csi reference signal may occur are non-periodically, and the OFDM symbols in each subframe are the same or different.

In this embodiment of the present invention, the transmission resource configuration information of the channel sounding reference signal at least includes one of the following: subframe position information of a channel sounding reference signal, Physical Resource Block pair (PRB pair) position information of the channel sounding reference signal, antenna port (port) number information of the channel sounding reference signal, and Resource Element (RE, Element) position information of the channel sounding reference signal in the PRB pair;

when the channel sounding reference signal is an opportunistic periodic channel sounding reference signal, the sending the downlink control signaling including the transmission resource configuration information of the channel sounding reference signal to the terminal includes:

transmitting subframe position information of a channel measurement reference signal and/or PRB pair position information of the channel measurement reference signal and/or antenna port number information of the channel measurement reference signal and/or RE position information of the channel measurement reference signal in PRB pair to a terminal through Radio Resource Control (RRC) signaling;

when the channel sounding reference signal is an aperiodic channel sounding reference signal, the sending the downlink control signaling including the transmission resource configuration information of the channel sounding reference signal to the terminal includes:

transmitting subframe position information of a channel measurement reference signal to a terminal through a physical layer configuration signaling; and/or the presence of a gas in the gas,

transmitting PRB pair position information of a channel measurement reference signal to a terminal through a physical layer control signaling; and/or the presence of a gas in the gas,

transmitting the antenna port number information of the channel measurement reference signal to the terminal through physical layer signaling and/or RRC signaling; and/or the presence of a gas in the gas,

and transmitting the RE position information of the channel measurement reference signal in the PRB pair to the terminal through physical layer signaling and/or RRC signaling.

In this embodiment of the present invention, when the channel sounding reference signal is an opportunistic periodic channel sounding reference signal, the method further includes:

after a channel is successfully acquired, transmitting a channel preemption success indication and/or a channel measurement reference signal transmission enable to a terminal through a PCell or a Scell, so that the terminal periodically receives the channel preemption success indication and/or the channel measurement reference signal transmission enable at a preset subframe position; or,

before or at each periodic transmission point, sending an instruction to a terminal through a PCell or a Scell so that the terminal receives a current periodic channel measurement reference signal at a preset subframe position; or,

and before or at each periodic transmission point, sending an indication to the UE through a PCell or a Scell so as to inform the terminal that the channel measurement reference signal in the current period cannot be sent.

In the embodiment of the invention, when the sending of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is simultaneously supported, the position information of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is notified to a terminal by adopting an independent notification mode or an implicit notification mode; the implicit notification method comprises the following steps: the sending position of the aperiodic channel measurement reference signal is agreed in advance between the base station and the terminal and is within K subframes occupied at the initial stage, and K is more than or equal to 1.

In the embodiment of the present invention, for the case that the channel measurement reference signal is transmitted on the incomplete subframe, the processing is performed according to one of the following manners:

configuring two channel measurement reference signal configurations for a terminal, wherein the first configuration corresponds to a complete subframe; the second configuration corresponds to an incomplete subframe;

notifying the terminal of the configuration information using the first configuration or the second configuration through Downlink Control Information (DCI) in the physical control signaling; or the terminal selects the used CSI-RS configuration according to the subframe length;

the method comprises the following steps of limiting the transmission of aperiodic channel measurement reference signals on partial subframes: not allowing part of subframes to transmit the channel measurement reference signal; or, only allowing partial sub-frames with length larger than the preset length to transmit the channel measurement reference signal, and/or making an agreement on the configuration of the channel measurement reference signal.

Another embodiment of the present invention provides a CSI measurement feedback method for an unlicensed carrier, including:

receiving a downlink control signaling which is sent by a base station and comprises transmission resource configuration information of a channel measurement reference signal, wherein the transmission resource configuration information of the channel measurement reference signal is used for determining the position of the channel measurement reference signal;

determining a channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal, and performing channel measurement on the channel measurement reference signal;

and sending the channel measurement result to the base station.

In the embodiment of the present invention, the sending the channel measurement result to the base station includes:

and sending the channel measurement result to the base station by adopting a PUCCH period, wherein the candidate reporting resources comprise: a PUCCH of a serving SCell deployed on an unlicensed carrier, a PUCCH of a PCell deployed on a licensed carrier, and a PUCCH of a Scell deployed on other unlicensed carriers; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the method comprises the steps that one or more specific SCells in a coordinated unlicensed carrier set are designated for CSI feedback, and a specific LBT/CCA method and/or parameters are/is adopted when the specific SCells seize resources, so that the priority and the success rate of resource seizing are improved; or, the PUSCH is adopted to send the channel measurement result to the base station non-periodically, and the candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the specific SCell or SCells in the coordinated unlicensed carrier set are designated to be used for CSI feedback, and when the specific SCell is used for resource preemption, a specific LBT/CCA method and/or parameters are adopted, so that the priority and the success rate of the resource preemption are improved.

In the embodiment of the invention, different CSI reporting configurations are carried out aiming at the situation whether frequency multiplexing exists on an unauthorized carrier:

configuring a smaller CSI reporting period and configuring broadband CSI and/or sub-band CSI for a scene with frequency multiplexing on an unauthorized carrier;

configuring a larger CSI reporting period for a scene without frequency reuse on an unauthorized carrier, configuring two CSI reporting modes of broadband CSI only and carrying out configuration by RRC, and dynamically indicating which reporting mode is used by the DCI; or implicitly indicating whether frequency reuse exists on the unlicensed carrier;

only one CSI measurement mode can be configured, and the CSI measurement result is reported;

two CSI measurement modes can be configured at the same time, and one or two of the CSI measurement modes can be reported according to the existence of frequency reuse.

The base station provided by the embodiment of the invention comprises:

a sending unit, configured to send a downlink control signaling including transmission resource configuration information of a channel sounding reference signal to a terminal, where the transmission resource configuration information of the channel sounding reference signal is used to determine a position of the channel sounding reference signal;

and the receiving unit is used for receiving the channel measurement result sent by the terminal when the terminal determines the channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal and performs channel measurement on the channel measurement reference signal.

the method comprises the steps that an opportunistic period channel measurement reference signal is located in a subframe period, and OFDM symbols in each subframe are the same or different;

the subframe in which the aperiodic channel measurement reference signal is located occurs in an aperiodic way, and the OFDM symbols in each subframe are the same or different.

In this embodiment of the present invention, the transmission resource configuration information of the channel sounding reference signal at least includes one of the following: subframe position information of the channel measurement reference signal, PRB pair position information of the channel measurement reference signal, antenna port number information of the channel measurement reference signal, and RE position information of the channel measurement reference signal in PRB pair;

the sending unit is further configured to send, by RRC signaling, subframe location information of the channel sounding reference signal and/or PRB pair location information of the channel sounding reference signal and/or antenna port number information of the channel sounding reference signal and/or RE location information of the channel sounding reference signal in PRB pair to the terminal when the channel sounding reference signal is an opportunistic cycle channel sounding reference signal;

the sending unit is further configured to send subframe location information of the channel sounding reference signal to the terminal through a physical layer configuration signaling when the channel sounding reference signal is an aperiodic channel sounding reference signal; and/or transmitting PRB pair position information of the channel measurement reference signal to the terminal through physical layer control signaling; and/or transmitting the antenna port number information of the channel measurement reference signal to the terminal through physical layer signaling and/or RRC signaling; and/or transmitting the RE position information of the channel measurement reference signal in the PRB pair to the terminal through physical layer signaling and/or RRC signaling.

In the embodiment of the present invention, the base station further includes: a notification unit, configured to, when the channel sounding reference signal is an opportunistic periodic channel sounding reference signal, after a channel is successfully acquired, send a channel preemption success indication and/or a channel sounding reference signal transmission enable to a terminal through a primary cell PCell or a secondary cell Scell, so that the terminal receives the channel preemption success indication and/or the channel sounding reference signal transmission enable and then periodically receives the channel sounding reference signal at a preset subframe position; or,

In the embodiment of the present invention, the notifying unit is further configured to notify, when the sending of the opportunistic periodic channel sounding reference signal and the aperiodic channel sounding reference signal is simultaneously supported, the position information of the opportunistic periodic channel sounding reference signal and the aperiodic channel sounding reference signal to the terminal in an independent notification manner or an implicit notification manner; the implicit notification method comprises the following steps: the sending position of the aperiodic channel measurement reference signal is agreed in advance between the base station and the terminal and is within K subframes occupied at the initial stage, and K is more than or equal to 1.

In the embodiment of the present invention, the base station further includes:

a configuration unit, configured to configure two channel sounding reference signal configurations for a terminal, where a first configuration corresponds to a complete subframe; the second configuration corresponds to an incomplete subframe;

the notifying unit is further configured to notify the terminal of configuration information using the first configuration or the second configuration through DCI in physical control signaling; or the terminal selects the used CSI-RS configuration according to the subframe length;

The terminal provided by the embodiment of the invention comprises:

a receiving unit, configured to receive a downlink control signaling that includes transmission resource configuration information of a channel measurement reference signal and is sent by a base station, where the transmission resource configuration information of the channel measurement reference signal is used to determine a position of the channel measurement reference signal;

the measurement unit is used for determining a channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal and carrying out channel measurement on the channel measurement reference signal;

and the sending unit is used for sending the channel measurement result to the base station.

In the embodiment of the present invention, the sending unit is further configured to send the channel measurement result to the base station by using a PUCCH period; the candidate reporting resources include: a PUCCH of a serving SCell deployed on an unlicensed carrier, a PUCCH of a PCell deployed on a licensed carrier, and a PUCCH of a Scell deployed on other unlicensed carriers; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the method comprises the steps that one or more specific SCells in a coordinated unlicensed carrier set are designated for CSI feedback, and a specific LBT/CCA method and/or parameters are/is adopted when the specific SCells seize resources, so that the priority and the success rate of resource seizing are improved; or, the PUSCH is adopted to send the channel measurement result to the base station in a non-periodic manner; the candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the specific SCell or SCells in the coordinated unlicensed carrier set are designated to be used for CSI feedback, and when the specific SCell is used for resource preemption, a specific LBT/CCA method and/or parameters are adopted, so that the priority and the success rate of the resource preemption are improved.

In the embodiment of the present invention, the terminal further includes:

a configuration unit, configured to perform different CSI reporting configurations for whether a frequency reuse scenario exists on an unlicensed carrier: configuring a smaller CSI reporting period and configuring broadband CSI and/or sub-band CSI for a scene with frequency multiplexing on an unauthorized carrier; configuring a larger CSI reporting period and only configuring broadband CSI for a scene without frequency reuse on an unauthorized carrier; two CSI reporting modes can be configured by RRC, and DCI dynamically indicates which reporting mode is used; or implicitly indicating whether frequency reuse exists on the unlicensed carrier; only one CSI measurement mode can be configured, and the CSI measurement result is reported; two CSI measurement modes can be configured at the same time, and one or two of the CSI measurement modes can be reported according to the existence of frequency reuse.

In the technical scheme of the embodiment of the invention, a base station sends a downlink control signaling comprising transmission resource configuration information of a channel measurement reference signal to a terminal, wherein the transmission resource configuration information of the channel measurement reference signal is used for determining the position of the channel measurement reference signal. And the terminal determines the position of the channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal, performs channel measurement and then sends the channel measurement result to the base station. Therefore, the problems of sending indication of the channel measurement reference signal and reporting the channel measurement result are solved. The CSI measurement feedback mechanism of the embodiment of the invention meets the requirement on the unauthorized carrier.

Drawings

Fig. 1 is a schematic flowchart of a CSI measurement feedback method for an unlicensed carrier according to a first embodiment of the present invention;

fig. 2 is a flowchart illustrating a CSI measurement feedback method for an unlicensed carrier according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 4 is a schematic structural component diagram of a terminal according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a CSI measurement feedback system of an unlicensed carrier according to an embodiment of the present invention. Detailed Description

So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.

The method aims at the problems that in the related art, the channel measurement reference signal cannot be transmitted strictly and periodically, and the measurement feedback is not suitable for the unauthorized carrier. The embodiment of the present invention provides a CSI measurement feedback method for an unlicensed carrier, where fig. 1 is a schematic flow chart of the CSI measurement feedback method for the unlicensed carrier according to the first embodiment of the present invention, and the CSI measurement feedback method for the unlicensed carrier in this example is applied to a base station side, as shown in fig. 1, where the CSI measurement feedback method for the unlicensed carrier includes the following steps:

step 101: and sending a downlink control signaling comprising transmission resource configuration information of the channel measurement reference signal to a terminal, wherein the transmission resource configuration information of the channel measurement reference signal is used for determining the position of the channel measurement reference signal.

In the embodiment of the invention, because the occupation of the unauthorized carrier channel is uncertain, the base station issues the position of the channel measurement reference signal to the terminal in an indicating mode. Specifically, the base station sends a downlink control signaling to the terminal, where the downlink control signaling includes transmission resource configuration information of the channel sounding reference signal, and the transmission resource configuration information of the channel sounding reference signal is used to determine a position of the channel sounding reference signal.

the method comprises the steps that subframes possibly appearing in an opportunistic periodic channel measurement reference signal appear periodically, and OFDM symbols in each subframe are the same or different;

Specifically, from the terminal perspective, the positions where the channel measurement reference signals may appear include the following situations:

1. the subframe period in which the channel measurement reference signal may occur occurs; for example, the channel sounding reference signal may appear in the T, 2T, 3T, …, N × T sub-frame, where T denotes the period of the channel sounding reference signal, and the OFDM symbols appearing in each sub-frame of the channel sounding reference signal may be the same or different. Since only the SCell acquiring the channel can transmit the channel measurement reference signal at each cycle point, the SCell that fails to acquire the channel cannot transmit the channel measurement reference signal. The channel sounding reference signal in this case is referred to as an opportunistic periodic channel sounding reference signal.

2. Subframes in which the channel sounding reference signals may occur are aperiodic, and OFDM symbols in each subframe in which the channel sounding reference signals occur are fixed. The channel sounding reference signal in this case is referred to as an aperiodic channel sounding reference signal.

In the above scheme, the subframe may be a subframe with a length of 1ms in the LTE, or may be a subframe with another length, for example, a partial subframe with a length of less than 1ms, or a superframe with a length of more than 1 ms.

In this embodiment of the present invention, the transmission resource configuration information of the channel sounding reference signal at least includes one of the following: the method comprises the steps of obtaining subframe position information of a channel measurement reference signal, PRB pair position information of the channel measurement reference signal, antenna port number information of the channel measurement reference signal and RE position information of the channel measurement reference signal in PRB pair.

and sending the subframe position information of the channel measurement reference signal and/or the PRB pair position information of the channel measurement reference signal and/or the antenna port number information of the channel measurement reference signal and/or the RE position information of the channel measurement reference signal in the PRB pair to the terminal through RRC signaling.

In the above scheme, the physical layer configuration signaling, the physical layer control signaling, and the RRC signaling may be sent on an authorized carrier, or may be sent on an unauthorized carrier.

In this embodiment of the present invention, the LAA SCell may perform channel measurement reference signal transmission by using one of the following methods:

method 1, for an opportunistic periodic channel sounding reference signal, a base station sends subframe position information, port number information, PRB pair position information, and RE position information of the PRB pair of the channel sounding reference signal to a terminal through RRC signaling. The terminal assumes that it may receive the csi at a predetermined subframe position. Due to LBT/CCA limitations, the base station cannot transmit the channel sounding reference signal at each periodic point, and the base station should transmit notification information to the terminal through physical layer control signaling. The method of notification may be one of:

1) after the base station successfully acquires the channel, the base station sends a channel preemption success indication and/or a channel measurement reference signal sending enable to the terminal through the PCell or the Scell, and informs the terminal that the base station successfully preempts the channel and/or the channel measurement reference signal can be sent. The terminal receives the channel sounding reference signal periodically after receiving the notification. And when the base station is about to release or has released or the channel measurement reference signal can not be sent again, the base station sends a channel release instruction and/or a channel measurement reference signal stop sending instruction to the terminal through the PCell or the Scell, and then the terminal does not assume that the channel measurement reference signal exists at the preset subframe position until the terminal receives a channel preemption success instruction and/or a channel measurement reference signal sending enable next time, and continues to receive the channel measurement reference signal.

2) The base station sends an indication to the terminal through the PCell or the Scell before or at each period sending point to inform the terminal that the current channel measurement reference signal can be sent. And the terminal determines that the channel measurement reference signal can be received at the current transmission cycle point according to the received indication. If the transmission indication is not received, the channel measurement reference signal is not transmitted at the periodic point.

3) And the base station sends an instruction to the terminal through the PCell or the Scell before or at each period sending point to inform the terminal that the current channel measurement reference signal cannot be sent. And the terminal determines that the channel measurement reference signal cannot be received at the current transmission periodic point according to the received indication. And if the non-transmission indication is not received, the channel measurement reference signal is considered to be transmitted at the periodic point.

Method 2, for the non-periodic channel measurement reference signal, the base station sends the notice of the subframe position information to the terminal through the physical layer configuration signaling; the base station sends a notice of PRB pair position information to the terminal through a physical layer control signaling; the base station sends a notification of the channel measurement reference signal port number information to the terminal through physical layer signaling and/or Radio Resource Control (RRC) signaling; the base station sends the information of the RE position of the channel measurement reference signal in the PRB pair to the terminal through physical layer signaling and/or RRC signaling.

The base station side sends the transmission resource configuration information of the channel measurement reference signal, and the terminal side can determine the sending position of the channel measurement reference signal according to the information, for example, the sending position of the channel measurement reference signal can be determined according to the subframe position information of the physical layer configuration signaling received by the terminal and a predetermined rule, wherein the channel measurement reference signal is an aperiodic channel measurement reference signal.

And 3, simultaneously supporting the sending of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal.

The configuration method in the above method 1 and method 2 can be used for independently configuring the opportunistic periodic channel sounding reference signal and the aperiodic sounding reference signal.

When the sending of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is simultaneously supported, the position information of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is notified to a terminal by adopting an independent notification mode or an implicit notification mode; the implicit notification method comprises the following steps: the sending position of the aperiodic channel measurement reference signal is agreed in advance between the base station and the terminal and is within K subframes occupied at the initial stage, and K is more than or equal to 1. Specifically, the method comprises the following steps:

the base station may coordinate the transmission of the periodic channel sounding reference signal and the aperiodic channel sounding reference signal according to the following rules:

1) independent notification:

independently notifying whether periodic channel measurement reference signals and non-periodic measurement reference signals appear or not, and indicating the appearance of the periodic channel measurement reference signals according to the method 1; the presence of aperiodic channel sounding reference signals is indicated according to method 2.

2) Implicit notification:

the method comprises the steps that a sending position of an aperiodic channel measurement reference signal is agreed in advance between a base station and a terminal and is within K subframes in an initial occupation stage, for example, K is 1, and the aperiodic channel measurement reference signal can be sent only in the first subframe after the aperiodic channel measurement reference signal occupies a channel; k is 2, which means that the aperiodic sounding reference signal can be transmitted in the first two subframes after occupying the channel; k is 3, which means that the aperiodic sounding reference signal can be transmitted in the first three subframes after occupying the channel; the first sub-frame may be a complete sub-frame (i.e. a sub-frame with a length of one standard frame length, such as 1 ms), or may be an incomplete sub-frame (i.e. a sub-frame with a length of less than one standard frame length, such as 1 ms).

If the base station determines that no periodic channel measurement reference signal is sent in the first K subframes of the occupation period according to the opportunistic periodic channel measurement reference signal configuration, the base station configures and sends a non-periodic measurement reference signal in the initial occupation period. Accordingly, the terminal receives the aperiodic sounding reference signal and the opportunistic periodic channel sounding reference signal according to the configuration of the base station.

If the base station determines that the periodic channel measurement reference signal is sent in the first K subframes of the occupation period according to the opportunistic periodic channel measurement reference signal configuration, the base station does not configure and send the non-periodic measurement reference signal at the initial occupation stage. Correspondingly, the terminal determines that the periodic channel measurement reference signal is to be sent in the first K subframes of the occupation period according to the opportunistic periodic channel measurement reference signal configuration configured in advance by the base station, and the terminal defaults that the base station cannot send the non-periodic measurement reference signal.

The above-mentioned separate notification and implicit notification method can be used in combination, that is, the implicit notification method is used in the early period of occupancy. During the occupation process, the base station can still adopt an explicit notification method to configure and transmit the opportunity periodic and aperiodic measurement reference signals.

For the case that the channel measurement reference signal is transmitted on an incomplete subframe, the processing is performed according to one of the following modes:

the method comprises the following steps of limiting the transmission of aperiodic channel measurement reference signals on partial subframes: not allowing part of subframes to transmit the channel measurement reference signal; or, only allowing partial sub-frames with length larger than the preset length to transmit the channel measurement reference signal, and/or making an agreement on the configuration of the channel measurement reference signal. Specifically, the method comprises the following steps: for the case that the opportunistic periodic channel measurement reference signal or the aperiodic channel measurement reference signal is transmitted on an incomplete subframe, the processing can be performed in one of the following manners:

1. a base station configures two channel measurement reference signal configurations for a terminal, wherein a first configuration corresponds to a complete subframe; the second configuration corresponds to an incomplete subframe situation; then, the terminal is informed through DCI in the physical control signaling, and the first configuration or the second configuration is specifically used; or the terminal automatically selects which CSI-RS configuration to use according to the subframe length. Wherein the second configuration satisfies the following partial subframe channel measurement reference signal transmission constraint.

2. Limiting aperiodic channel sounding reference signal transmission on partial subframes:

1) the channel measurement reference signal is not allowed to be transmitted in a part of the sub-frame. Or,

2) only allowing partial sub-frames with length larger than a certain length to send the channel measurement reference signal, and/or restricting the configuration of the channel measurement reference signal;

wherein, the transmission constraint of the channel measurement reference signals of part of subframes refers to:

example 1: only partial sub-frames with a length greater than half a sub-frame, i.e., 0.5ms, are allowed to transmit the channel sounding reference signal. At the same time, only the CSI-RS configuration mapped on the second half frame, namely the second slot (slot) by using the CSI is agreed. For example, in the existing protocol, for a Normal Cyclic Prefix (Normal Cyclic Prefix), only CSI-RS configurations between configuration 0 and configuration 31 except configuration 0,5,10,11 can be configured; for Extended Cyclic Prefix (Extended Cyclic Prefix), only CSI-RS configurations other than 0,1, 4,5, 8, 9,10,11 between configuration 0 and configuration 27 can be configured.

Or if the configuration is the CSI-RS configuration of CSI mapping in the first half frame, the CSI reference signal can be mapped to the second half frame for transmission; taking CSI-RS configuration 0 of the normal CP as an example, (k ', l') (9,5), ns ═ 0; can map to slot2, (k ', l') (9,5), ns ═ 1.

Example 2: only a partial subframe having a length greater than 4 OFDM symbols is allowed to transmit the channel sounding reference signal. And meanwhile, only CSI is mapped on the second half frame, namely the second slot (slot), and the time domain position does not exceed the CSI-RS configuration of the 4 th OFDM symbol. For example, in the existing protocol, for a Normal Cyclic Prefix (Normal Cyclic Prefix), only CSI-RS configurations between configuration 0 and configuration 31 except configuration 0,4,5,9,10,11,18,19 can be configured; for an Extended cyclic prefix (Extended cyclic prefix), the configuration can be only configured as the CSI-RS configuration of the frame structure 2, and is 16-27.

Step 102: and when the terminal determines the channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal and performs channel measurement on the channel measurement reference signal, receiving a channel measurement result sent by the terminal.

In the embodiment of the invention, when the channel measurement reference signal is an opportunistic periodic channel measurement reference signal, after a channel is successfully acquired, a primary cell PCell or a secondary cell Scell sends a channel preemption success indication and/or a channel measurement reference signal sending enable to a terminal, so that the terminal receives the channel preemption success indication and/or the channel measurement reference signal sending enable and then periodically receives the channel measurement reference signal at a preset subframe position; or before or at each periodic transmission point, sending an instruction to the terminal through a PCell or a Scell so that the terminal receives the current periodic channel measurement reference signal at a preset subframe position; or before or at each periodic transmission point, an indication is sent to the terminal through the PCell or the Scell to inform the terminal that the channel measurement reference signal cannot be sent in the current period.

Fig. 2 is a schematic flow chart of a CSI measurement feedback method for an unlicensed carrier according to a second embodiment of the present invention, where the CSI measurement feedback method for an unlicensed carrier in this example is applied to a terminal side, and as shown in fig. 2, the CSI measurement feedback method for an unlicensed carrier includes the following steps:

step 201: receiving a downlink control signaling which is sent by a base station and comprises transmission resource configuration information of a channel measurement reference signal, wherein the transmission resource configuration information of the channel measurement reference signal is used for determining the position of the channel measurement reference signal.

Step 202: and determining the channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal, and performing channel measurement on the channel measurement reference signal.

Step 203: and sending the channel measurement result to the base station.

In the embodiment of the invention, the terminal sends the channel measurement result to the base station by adopting a PUCCH period, and the candidate reporting resources comprise: a PUCCH of a serving SCell deployed on an unlicensed carrier, a PUCCH of a PCell deployed on a licensed carrier, and a PUCCH of a Scell deployed on other unlicensed carriers; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the method comprises the steps that one or more specific SCells in a coordinated unlicensed carrier set are designated for CSI feedback, and a specific LBT/CCA method and/or parameters are/is adopted when the specific SCells seize resources, so that the priority and the success rate of resource seizing are improved; or, the PUSCH is adopted to send the channel measurement result to the base station non-periodically, and the candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the specific SCell or SCells in the coordinated unlicensed carrier set are designated to be used for CSI feedback, and when the specific SCell is used for resource preemption, a specific LBT/CCA method and/or parameters are adopted, so that the priority and the success rate of the resource preemption are improved.

Preferably, specific one or more scells in the coordinated unlicensed carrier set are designated for CSI feedback, for example, the SCell with the best channel condition (with the largest measured value such as RSRP, CQI, SINR, etc.) is used, or the SCell with the smallest/largest cell number is used as the designated CSI feedback SCell, and when resource is preempted, the specific scells adopt a specific LBT/CCA method and/or parameter, so as to improve the priority and success rate of resource preemption, for example, only initial CCA operation may be performed, ECCA operation is not performed, and/or a smaller contention window is used.

In the embodiment of the present invention, for sending the channel measurement result to the base station by using the PUCCH period, the following manner may be adopted:

1. at a predetermined periodic CSI reporting time point,

1) preferentially using a PUCCH of a serving SCell deployed on an unlicensed carrier to carry out periodic CSI reporting;

2) if the serving SCell deployed on the unauthorized carrier does not seize channel resources, attempting to schedule a PUCCH of a PCell deployed on the authorized carrier, and performing periodic CSI reporting;

3) and if the PUCCH resources on the PCell deployed on the authorized carrier are in shortage and the PUCCH resources cannot be allocated for the CSI report of the unauthorized carrier, trying to schedule the PUCCH of the Scell deployed on other unauthorized carriers and carrying out periodic CSI report.

The other unauthorized carriers and the serving unauthorized carrier belong to a coordinated unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to perform control channel and/or data channel transmission.

4) And if neither the PCell deployed on the authorized carrier nor the coordinated SCell deployed on the unauthorized carrier can schedule the PUCCH for periodic CSI reporting, the CSI reporting is abandoned.

2. At a predetermined periodic CSI reporting time point,

1) preferentially using a PUCCH of a serving PCell deployed on an authorized carrier to carry out periodic reporting;

2) if the PUCCH resources of the serving PCell deployed on the authorized carrier are in shortage and the PUCCH resources cannot be allocated for the CSI report of the unauthorized carrier, trying to schedule the PUCCH of the serving Scell deployed on the unauthorized carrier and carrying out periodic CSI report;

3) if the serving SCell deployed on the unlicensed carrier does not seize channel resources, scheduling PUCCHs of other SCells deployed on the unlicensed carrier can be tried, and periodic CSI reporting is carried out;

For sending the channel measurement result to the base station by using the PUSCH non-periodically, the following method may be adopted:

1. at the triggered aperiodic CSI reporting time point,

1) preferentially using a PUSCH of a serving SCell deployed on an unauthorized carrier to carry out aperiodic CSI reporting;

2) if the serving SCell deployed on the unlicensed carrier cannot acquire uplink channel resources at this time, the PUSCH resource of the PCell deployed on the licensed carrier may be used to perform aperiodic CSI reporting;

3) if the PCell deployed on the authorized carrier wave can not schedule the PUSCH resource, trying to schedule the PUSCH resource of the Scell deployed on other unauthorized carrier waves, and reporting the aperiodic CSI;

the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel.

4) And if neither the PCell deployed on the authorized carrier nor the coordinated SCell deployed on the unauthorized carrier can schedule the PUSCH for aperiodic CSI reporting, the CSI reporting is abandoned.

2. At the triggered aperiodic CSI reporting time point,

1) preferentially using a PUSCH resource of a PCell deployed on an authorized carrier to carry out aperiodic CSI reporting;

2) if the PCell deployed on the authorized carrier can not schedule PUSCH resources at the moment, using the PUSCH of the serving SCell deployed on the unauthorized carrier to carry out aperiodic CSI reporting;

3) if the serving SCell deployed on the unauthorized carrier wave can not acquire uplink channel resources at the moment, attempting to schedule PUSCH resources of the Scell deployed on other unauthorized carrier waves, and reporting the aperiodic CSI;

The candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a coordinated unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to perform control channel and/or data channel transmission. Preferably, specific one or more scells in the coordinated unlicensed carrier set are designated for CSI feedback, and when the specific scells perform resource preemption, a specific LBT/CCA method and/or parameter is used to improve the priority and success rate of resource preemption, for example, only initial CCA operation may be performed, ECCA operation may not be performed, and/or a smaller contention window may be used.

For different interference characteristics, the LTE system may configure multiple types of unlicensed carrier Channel State Information (CSI):

1. for scenarios supporting frequency reuse on unlicensed carriers:

when a serving SCell deployed on an unlicensed carrier occupies a channel, there may be other scells deployed on the same unlicensed carrier in a system that simultaneously occupy the channel, the interference condition is similar to that of a licensed carrier, the interference of the occupied period also changes frequently, and the frequency-selective characteristic is exhibited in the frequency domain.

In this scenario, a smaller CSI reporting period may be configured on the unlicensed carrier, and wideband CSI and/or subband CSI may be configured, where the CSI may include CQI, PMI, and RI.

2. For a scenario where frequency reuse is not supported on unlicensed carriers:

after LBT/CCA is successful, the serving SCell deployed on the unlicensed carrier will monopolize the channel, interference in the system is dominated by thermal noise, remains substantially stable for several occupancies, and remains stable in the frequency domain.

In this scenario, the unlicensed carrier may configure a larger CSI reporting period, and may only configure wideband CSI, where the CSI may include CQI, PMI, and RI.

For a scenario in which multiple adjacent unlicensed carriers and non-frequency reuse are configured in the system, if the LAA useful signal transmission powers on the multiple adjacent unlicensed carriers are equivalent, the CSI of the multiple unlicensed carriers is approximate.

In this scenario, when the CSI of a certain unlicensed carrier is not available, the CSI of other carriers may be used as the approximate CSI. Where the partial content of the possible CSI may be approximated, e.g., only the CQI may be approximated, or the CQI and/or RI may be approximated; it is also possible that all contents of CSI can be approximated, e.g., CQI, PMI, RI can be approximated;

thus, a CSI cooperating set may be defined, the LAA useful signal transmit power P being the same, or within a small range, e.g. Pmin < ═ P < ═ Pmax, Pmin being the minimum of the range and Pmax being the maximum of the range, for the cells on the unlicensed carriers of the set.

3. Scenarios in which frequency reuse is supported for unlicensed carriers, but not all cells are frequency reused all the time

Configuring CSI in a manner 1 when there is no frequency-taking cell; CSI is configured in a manner 2 when there is a frequency-taking cell.

Two CSI reporting modes can be configured by RRC, and DCI dynamically indicates which reporting mode is used; an implicit indication may also be made of whether there is frequency reuse on the unlicensed carrier.

Fig. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 3, the base station according to the embodiment of the present invention includes:

a sending unit 31, configured to send a downlink control signaling including transmission resource configuration information of a channel measurement reference signal to a terminal, where the transmission resource configuration information of the channel measurement reference signal is used to determine a position of the channel measurement reference signal;

a receiving unit 32, configured to receive a channel measurement result sent by the terminal when the terminal determines a channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal and performs channel measurement on the channel measurement reference signal.

the sending unit 31 is further configured to send, by RRC signaling, subframe location information of the channel sounding reference signal and/or PRB pair location information of the channel sounding reference signal and/or antenna port number information of the channel sounding reference signal and/or RE location information of the channel sounding reference signal in PRB pair to the terminal when the channel sounding reference signal is an opportunistic period channel sounding reference signal;

the sending unit 31 is further configured to send subframe location information of the channel sounding reference signal to the terminal through a physical layer configuration signaling when the channel sounding reference signal is an aperiodic channel sounding reference signal; and/or transmitting PRB pair position information of the channel measurement reference signal to the terminal through physical layer control signaling; and/or transmitting the antenna port number information of the channel measurement reference signal to the terminal through physical layer signaling and/or RRC signaling; and/or transmitting the RE position information of the channel measurement reference signal in the PRB pair to the terminal through physical layer signaling and/or RRC signaling.

In the embodiment of the present invention, the base station further includes: a notifying unit 33, configured to, when the channel sounding reference signal is an opportunistic periodic channel sounding reference signal, send a channel preemption success indication and/or a channel sounding reference signal sending enable to a terminal through a primary cell PCell or a secondary cell Scell after a channel is successfully acquired, so that the terminal receives the channel preemption success indication and/or the channel sounding reference signal sending enable and then periodically receives the channel sounding reference signal at a preset subframe position; or,

The notifying unit 33 is further configured to notify, when the sending of the opportunistic periodic channel sounding reference signal and the aperiodic channel sounding reference signal is simultaneously supported, the position information of the opportunistic periodic channel sounding reference signal and the aperiodic channel sounding reference signal to the terminal in an independent notification manner or an implicit notification manner; the implicit notification method comprises the following steps: the sending position of the aperiodic channel measurement reference signal is agreed in advance between the base station and the terminal and is within K subframes occupied at the initial stage, and K is more than or equal to 1.

The base station further comprises:

a configuration unit 34, configured to configure two channel sounding reference signal configurations for the terminal, where a first configuration corresponds to a complete subframe; the second configuration corresponds to an incomplete subframe;

the notifying unit 33 is further configured to notify the terminal of the configuration information using the first configuration or the second configuration through DCI in physical control signaling; or the terminal selects the used CSI-RS configuration according to the subframe length;

Those skilled in the art will understand that the implementation functions of each unit in the base station shown in fig. 3 can be understood by referring to the related description of the CSI measurement feedback method for the unlicensed carrier. The functions of the units in the base station shown in fig. 3 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.

Fig. 4 is a schematic structural composition diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 4, the terminal according to the embodiment of the present invention includes:

a receiving unit 41, configured to receive a downlink control signaling that includes transmission resource configuration information of a channel measurement reference signal and is sent by a base station, where the transmission resource configuration information of the channel measurement reference signal is used to determine a position of the channel measurement reference signal;

a measuring unit 42, configured to determine a channel sounding reference signal according to transmission resource configuration information of the channel sounding reference signal, and perform channel sounding on the channel sounding reference signal;

a sending unit 43, configured to send the channel measurement result to the base station.

In this embodiment of the present invention, the sending unit 43 is further configured to send the channel measurement result to the base station by using a PUCCH period; the candidate reporting resources include: a PUCCH of a serving SCell deployed on an unlicensed carrier, a PUCCH of a PCell deployed on a licensed carrier, and a PUCCH of a Scell deployed on other unlicensed carriers; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the method comprises the steps that one or more specific SCells in a coordinated unlicensed carrier set are designated for CSI feedback, and a specific LBT/CCA method and/or parameters are/is adopted when the specific SCells seize resources, so that the priority and the success rate of resource seizing are improved; or, the PUSCH is adopted to send the channel measurement result to the base station in a non-periodic manner; the candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the specific SCell or SCells in the coordinated unlicensed carrier set are designated to be used for CSI feedback, and when the specific SCell is used for resource preemption, a specific LBT/CCA method and/or parameters are adopted, so that the priority and the success rate of the resource preemption are improved.

The terminal further comprises:

a configuration unit 44, configured to perform different CSI reporting configurations for whether a frequency reuse scenario exists on an unlicensed carrier: configuring a smaller CSI reporting period and configuring broadband CSI and/or sub-band CSI for a scene with frequency multiplexing on an unauthorized carrier; configuring a larger CSI reporting period and only configuring broadband CSI for a scene without frequency reuse on an unauthorized carrier; two CSI reporting modes can be configured by RRC, and DCI dynamically indicates which reporting mode is used; or implicitly indicating whether frequency reuse exists on the unlicensed carrier; only one CSI measurement mode can be configured, and the CSI measurement result is reported; two CSI measurement modes can be configured at the same time, and one or two of the CSI measurement modes can be reported according to the existence of frequency reuse.

In the technical scheme of the embodiment of the invention, a base station sends a downlink control signaling comprising transmission resource configuration information of a channel measurement reference signal to a terminal, wherein the transmission resource configuration information of the channel measurement reference signal is used for determining the position of the channel measurement reference signal. And the terminal determines the position of the channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal, performs channel measurement and then sends the channel measurement result to the base station. Therefore, the channel measurement reference signal is strictly transmitted periodically, and the channel measurement result is reported on the unauthorized carrier. The CSI measurement feedback mechanism of the embodiment of the invention meets the requirement on the unauthorized carrier.

Those skilled in the art will understand that the implementation functions of each unit in the terminal shown in fig. 4 can be understood by referring to the related description of the CSI measurement feedback method of the aforementioned unlicensed carrier. The functions of the units in the terminal shown in fig. 4 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.

Fig. 5 is a schematic structural diagram of a CSI measurement feedback system of an unlicensed carrier according to an embodiment of the present invention, and as shown in fig. 5, the system includes:

a base station 51, configured to send a downlink control signaling including transmission resource configuration information of a channel sounding reference signal to a terminal 52, where the transmission resource configuration information of the channel sounding reference signal is used to determine a position of the channel sounding reference signal; the terminal 52 determines a channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal, and receives a channel measurement result sent by the terminal 52 when performing channel measurement on the channel measurement reference signal;

a terminal 52, configured to receive a downlink control signaling that includes transmission resource configuration information of a channel measurement reference signal and is sent by a base station 51, where the transmission resource configuration information of the channel measurement reference signal is used to determine a position of the channel measurement reference signal; determining a channel measurement reference signal according to the transmission resource configuration information of the channel measurement reference signal, and performing channel measurement on the channel measurement reference signal; the channel measurement result is transmitted to the base station 51.

It should be understood by those skilled in the art that the functions implemented by the units in the electronic device according to the embodiment of the present invention may be understood by referring to the related description of the information processing method, and the units in the electronic device according to the embodiment of the present invention may be implemented by analog circuits that implement the functions described in the embodiment of the present invention, or by running software that executes the functions described in the embodiment of the present invention on the intelligent terminal 52.

The technical schemes described in the embodiments of the present invention can be combined arbitrarily without conflict.

In the embodiments provided in the present invention, it should be understood that the disclosed method and intelligent device may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present invention may be integrated into one second processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.

Claims

1. A method for feeding back Channel State Information (CSI) measurement of an unlicensed carrier, the method comprising:

2. The CSI measurement feedback method for unlicensed carriers according to claim 1, wherein the channel measurement reference signal includes at least one of the following signals: a cell reference signal CRS and a channel state information reference signal CSI-RS;

the method comprises the steps that a subframe period where an opportunistic period channel measurement reference signal is located appears, and Orthogonal Frequency Division Multiplexing (OFDM) symbols in each subframe are the same or different;

3. The CSI measurement feedback method for unlicensed carriers according to claim 2, wherein the transmission resource configuration information of the CSI measurement reference signal includes at least one of: subframe position information of a channel measurement reference signal, physical resource block pair PRB pair position information of the channel measurement reference signal, port number information of an antenna port of the channel measurement reference signal, and resource element RE position information of the channel measurement reference signal in the PRB pair;

sending subframe position information of a channel measurement reference signal and/or PRB pair position information of the channel measurement reference signal and/or antenna port number information of the channel measurement reference signal and/or RE position information of the channel measurement reference signal in PRB pair to a terminal through Radio Resource Control (RRC) signaling;

4. The CSI measurement feedback method for unlicensed carriers according to claim 2 or 3, wherein when the channel measurement reference signal is an opportunistic periodic channel measurement reference signal, the method further comprises:

after a channel is successfully acquired, a primary cell PCell or a secondary cell Scell sends a channel preemption success indication and/or a channel measurement reference signal sending enable to a terminal, so that the terminal receives the channel preemption success indication and/or the channel measurement reference signal sending enable and then periodically receives a channel measurement reference signal at a preset subframe position; or,

5. The CSI measurement feedback method for unlicensed carriers according to claim 4, characterized in that the method further comprises:

when the sending of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is simultaneously supported, the position information of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is notified to a terminal by adopting an independent notification mode or an implicit notification mode; the implicit notification method comprises the following steps: the sending position of the aperiodic channel measurement reference signal is agreed in advance between the base station and the terminal and is within K subframes occupied at the initial stage, and K is more than or equal to 1.

6. The CSI measurement feedback method for unlicensed carriers according to claim 4, characterized in that the method further comprises:

configuring two channel measurement reference signal configurations for a terminal, wherein the first configuration corresponds to a complete subframe; the second configuration corresponds to an incomplete subframe and meets the channel measurement reference signal configuration constraint on partial subframes; notifying the terminal of the configuration information using the first configuration or the second configuration through Downlink Control Information (DCI) in the physical control signaling; or the terminal selects the used CSI-RS configuration according to the subframe length;

the method comprises the following steps of limiting the transmission of aperiodic channel measurement reference signals on partial subframes: not allowing part of subframes to transmit the channel measurement reference signal; or only allowing partial subframes with the length larger than the preset length to transmit the channel measurement reference signal, and/or making an agreement on the configuration of the channel measurement reference signal, and/or mapping the first half subframe and the second half subframe of the measurement reference signal.

7. A method for feeding back Channel State Information (CSI) measurement of an unlicensed carrier, the method comprising:

and sending the channel measurement result to the base station.

8. The method of claim 7, wherein the sending the channel measurement result to the base station comprises:

and sending the channel measurement result to the base station by adopting a Physical Uplink Control Channel (PUCCH) period, wherein the candidate reporting resources comprise: a PUCCH of a serving SCell deployed on an unlicensed carrier, a PUCCH of a PCell deployed on a licensed carrier, and a PUCCH of a Scell deployed on other unlicensed carriers; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the method comprises the steps that one or more specific SCells in a coordinated unlicensed carrier set are designated for CSI feedback, and a specific LBT/CCA method and/or parameters are/is adopted when the specific SCells seize resources, so that the priority and the success rate of resource seizing are improved;

or, the physical uplink shared channel PUSCH is adopted to send the channel measurement result to the base station non-periodically, and the candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the specific SCell or SCells in the coordinated unlicensed carrier set are designated to be used for CSI feedback, and when the specific SCell is used for resource preemption, a specific LBT/CCA method and/or parameters are adopted, so that the priority and the success rate of the resource preemption are improved.

9. The CSI measurement feedback method for unlicensed carriers according to claim 7, further comprising:

different CSI reporting configurations are carried out according to whether a frequency multiplexing scene exists on an unauthorized carrier:

configuring a larger CSI reporting period and only configuring broadband CSI for a scene without frequency reuse on an unauthorized carrier;

two CSI reporting modes can be configured by RRC, and DCI dynamically indicates which reporting mode is used; or implicitly indicating whether frequency reuse exists on the unlicensed carrier;

10. A base station, characterized in that the base station comprises:

11. The base station of claim 10, wherein the channel measurement reference signal comprises at least one of: CRS, CSI-RS;

12. The base station of claim 11, wherein the transmission resource configuration information of the channel measurement reference signal comprises at least one of: subframe position information of the channel measurement reference signal, PRB pair position information of the channel measurement reference signal, antenna port number information of the channel measurement reference signal, and RE position information of the channel measurement reference signal in PRB pair;

13. The base station according to claim 11 or 12, characterized in that the base station further comprises: a notification unit, configured to, when the channel sounding reference signal is an opportunistic periodic channel sounding reference signal, after a channel is successfully acquired, send a channel preemption success indication and/or a channel sounding reference signal transmission enable to a terminal through a primary cell PCell or a secondary cell Scell, so that the terminal receives the channel preemption success indication and/or the channel sounding reference signal transmission enable and then periodically receives the channel sounding reference signal at a preset subframe position; or,

14. The base station of claim 13, wherein the notifying unit is further configured to notify the location information of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal to the terminal in an independent notification manner or an implicit notification manner when the transmission of the opportunistic periodic channel measurement reference signal and the aperiodic channel measurement reference signal is simultaneously supported; the implicit notification method comprises the following steps: the sending position of the aperiodic channel measurement reference signal is agreed in advance between the base station and the terminal and is within K subframes occupied at the initial stage, and K is more than or equal to 1.

15. The base station of claim 14, wherein the base station further comprises:

16. A terminal, characterized in that the terminal comprises:

17. The terminal of claim 16, wherein the sending unit is further configured to send the channel measurement result to the base station using a PUCCH period; the candidate reporting resources include: a PUCCH of a serving SCell deployed on an unlicensed carrier, a PUCCH of a PCell deployed on a licensed carrier, and a PUCCH of a Scell deployed on other unlicensed carriers; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the method comprises the steps that one or more specific SCells in a coordinated unlicensed carrier set are designated for CSI feedback, and a specific LBT/CCA method and/or parameters are/is adopted when the specific SCells seize resources, so that the priority and the success rate of resource seizing are improved; or, the PUSCH is adopted to send the channel measurement result to the base station in a non-periodic manner; the candidate reporting resources include: a PUSCH of a serving SCell deployed on an unlicensed carrier; a PUSCH resource of the PCell deployed on the licensed carrier; a PUSCH resource of the Scell deployed on other unlicensed carrier waves; the other unauthorized carriers and the serving unauthorized carrier belong to a cooperative unauthorized carrier set, and the unauthorized carriers in the set can cooperate with each other to transmit a control channel and/or a data channel; the specific SCell or SCells in the coordinated unlicensed carrier set are designated to be used for CSI feedback, and when the specific SCell is used for resource preemption, a specific LBT/CCA method and/or parameters are adopted, so that the priority and the success rate of the resource preemption are improved.

18. The terminal of claim 16, wherein the terminal further comprises: