CN105379160B - Sending method, user equipment and the base station of ascending control information - Google Patents

Abstract

This invention provides a method for transmitting uplink control information, a user equipment (UE), and a base station. The transmission method includes: the UE transmitting uplink control information to a second base station, causing the second base station to forward the uplink control information to a first base station, or the first base station obtaining the uplink control information through eavesdropping. This invention not only ensures the correct reception of uplink control information by the base station but also reduces the complexity of receiving uplink control information by the base station.

Description

Method for sending uplink control information, user equipment and base station

technical field

The present invention relates to a communication field, and in particular to a method for sending uplink control information of a user equipment that maintains connection with at least two base stations, the user equipment and the base station.

Background technique

In a Long Term Evolution (LTE, Long Term Evolution) system, a base station may configure multiple downlink carriers and/or multiple uplink carriers for a user equipment (UE), that is, carrier aggregation. When the user equipment feeds back the ACK/NACK corresponding to the Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel), it can simultaneously feed back the ACK/NACK of the PDSCH of multiple downlink carriers at one moment.

For example, for user equipment that can only support up to 2 downlink carriers, channel selection (channel selection) of physical uplink control channel format 1a/1b (PUCCH format 1a/1b) can be configured to carry ACK/NACK; for user equipment that can support more The user equipment of the downlink carrier can configure PUCCH format 3 to carry ACK/NACK of up to 5 downlink carriers.

In addition to ACK/NACK, uplink control information (UCI, Uplink Control Information) may also include channel state information (CSI, Channel State Information) and a scheduling request (SR). At one moment, the UE may send one kind of UCI, or may send multiple kinds of UCI at the same time. For example, the user equipment may send ACK/NACK, CSI or SR alone, but may also send ACK/NACK and CSI at the same time, or may send CSI and SR at the same time, or send ACK/NACK and CSI at the same time, or send all three at the same time.

For different UCI combinations, the PUCCH format adopted by the user equipment is different. For example, a user configured with format 3 can use format 1 to send SR when only sending SR, and can use format 3 to send SR and ACK/NACK at the same time.

Moreover, the PUCCH format adopted by the user equipment is also related to whether there is PDSCH transmission only on the main carrier. For example, for a user equipment configured with format 3, if there is only PDSCH transmission on the primary carrier, format 1a/1b is used to feed back ACK/NACK; otherwise, format 3 is used to feed back ACK/NACK.

In addition, with the development of user equipment, especially radio frequency equipment, although some user equipment cannot support simultaneous transmission of Physical Uplink Shared Channel (PUSCH, Physical Uplink Shared Channel) and PUCCH, some user equipment can already support simultaneous transmission of PUSCH and PUCCH. For this type of user equipment, whether the UCI is sent on the PUCCH or the PUSCH also has many possible combinations.

For example, if there is only ACK/NACK or CSI, PUCCH carries ACK/NACK or CSI, if there are both ACK/NACK and CSI, then PUCCH carries ACK/NACK, and PUSCH carries CSI, so as to reduce the impact of UCI on PUSCH data transmission. influences.

In existing carrier aggregation, multiple carriers configured for one user equipment are controlled by one base station, and it can be considered that a loop (Backhaul) between multiple carriers is ideal. Therefore, the base station clearly knows whether there is PDSCH transmission on each carrier, whether there is corresponding ACK/NACK transmission, and whether there is corresponding CSI transmission, so it can clearly know what method or format the user equipment uses for transmission. Although it may happen that the user equipment misses the PDCCH on some carriers and misses the PDSCH, causing the user equipment to transmit in a different way from the base station's reception assumption, but this possibility is low and will not cause much impact on the base station.

With the continuous development of small base stations, in Rel-12, there will be a scenario where there are multiple small base stations within the coverage of a macro base station. Each small base station has a small coverage area and a large number. The small base station may occupy different frequency points from the macro base station, or may occupy the same frequency point. The loop between the small base station and the macro base station can be ideal, that is, the delay is small or completely negligible, and the transmission capability is strong. More typical is non-ideal, that is, the transmission delay is large and the transmission capacity is limited.

Fig. 1 is a schematic diagram of a user equipment maintaining connection with a macro base station and a small base station. As shown in FIG. 1 , if the user equipment can maintain connection with the small base station and the macro base station at the same time, the user equipment can work in a kind of carrier aggregation similar to different eNBs (inter-eNB).

It should be noted that the above introduction of the technical background is only for the convenience of a clear and complete description of the technical solution of the present invention, and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art just because these solutions are described in the background of the present invention.

Contents of the invention

However, the inventors found that since the small base station and the macro base station belong to different eNBs, and the loop is not ideal, it is basically impossible for the base station to obtain information related to real-time scheduling of other base stations. For example, the macro base station cannot know the dynamic scheduling of the downlink PDSCH or the dynamic scheduling of the uplink PUSCH in each subframe of the small base station, so it cannot know the corresponding ACK/NACK transmission, and cannot know the location information of the PUSCH.

For user equipment that is not capable of simultaneously supporting transmission of multiple uplink carriers, time division multiplexing may be used. That is, the user equipment accesses different base stations in turn in a time-division manner; or the user equipment is fixedly connected to the uplink of one base station, and another base station obtains corresponding uplink control information by monitoring or forwarding relevant information through the receiving base station.

Therefore, uplink control information of multiple carriers may be carried on one uplink carrier. For example, the uplink control information of the macro base station and the small base station is sent on the macro base station, which is similar to the control information of all carriers sent on the main carrier in the existing carrier aggregation. . Because the macro base station cannot obtain the real-time scheduling information of the small base station, and the small base station cannot obtain the real-time scheduling information of the macro base station, therefore, some necessary interactive signaling needs to be added to ensure the correct reception of the base station, and the corresponding mechanism needs to be modified to Avoid multiple possible ways to send control information, which increases the complexity of receiving by the base station.

Embodiments of the present invention provide a method for sending uplink control information, user equipment, and a base station. The purpose is to correctly receive the uplink control information at the base station side and reduce the complexity of receiving when the user equipment maintains connection with at least two base stations.

According to an aspect of an embodiment of the present invention, a method for sending uplink control information is provided, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station, and the sending method includes:

The user equipment sends uplink control information to the second base station, so that the second base station forwards the uplink control information to the first base station, or the first base station obtains the uplink control information by monitoring;

Wherein, the format of the PUCCH carrying the uplink control information has nothing to do with whether there is PDSCH scheduling on one or more carriers; or the resource carrying the uplink control information has nothing to do with whether the PUSCH is used for a random access process.

According to another aspect of the embodiments of the present invention, there is provided a method for sending uplink control information, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station, and the sending method includes:

The user equipment sends periodic CSI to the second base station according to the periodic configuration, so that the second base station forwards the periodic CSI to the first base station, or the first base station obtains the periodic CSI by monitoring Sexual CSI; wherein the cycle configuration includes 4ms or 8Nms; where N is a positive integer.

According to another aspect of the embodiments of the present invention, there is provided a method for sending uplink control information, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station, and the sending method includes:

The user equipment receives a request for triggering aperiodic CSI reporting sent by the second base station;

The user equipment reports the aperiodic CSI related to the first base station, so that the second base station forwards the aperiodic CSI to the first base station, or the first base station obtains the aperiodic CSI by monitoring Aperiodic CSI.

According to another aspect of the embodiments of the present invention, there is provided a method for sending uplink control information, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station, and the sending method includes:

The second base station receives a request for triggering aperiodic CSI reporting sent by the first base station;

Sending the request for triggering aperiodic CSI reporting to the user equipment, so that the user equipment reports aperiodic CSI related to the first base station.

According to another aspect of the embodiments of the present invention, there is provided a user equipment that maintains connections with at least two base stations including a first base station and a second base station, and the user equipment includes:

an information sending unit, configured to send uplink control information to the second base station, so that the second base station forwards the uplink control information to the first base station, or the first base station obtains the uplink control information by monitoring;

Wherein, the format of the PUCCH carrying the uplink control information has nothing to do with whether there is PDSCH scheduling on one or more carriers; or the resource carrying the uplink control information has nothing to do with whether the PUSCH is used for a random access process.

According to another aspect of the embodiments of the present invention, there is provided a user equipment that maintains connections with at least two base stations including a first base station and a second base station, and the user equipment includes:

An information sending unit, which sends periodic CSI to the second base station according to the periodic configuration, so that the second base station forwards the periodic CSI to the first base station, or the first base station obtains the periodic CSI by monitoring Sexual CSI; wherein the cycle configuration includes 4ms or 8Nms; where N is a positive integer.

According to another aspect of the embodiments of the present invention, there is provided a user equipment that maintains connections with at least two base stations including a first base station and a second base station, and the user equipment includes:

instructing the receiving unit to receive an indication of triggering aperiodic CSI reporting sent by the second base station;

an information reporting unit, for reporting the aperiodic CSI related to the first base station, so that the second base station forwards the aperiodic CSI to the first base station, or the first base station obtains the aperiodic CSI by monitoring Aperiodic CSI.

According to another aspect of the embodiments of the present invention, a base station is provided, wherein the user equipment maintains connection with at least two base stations including the first base station and the base station, and the base station includes:

a request receiving unit, configured to receive a request for triggering aperiodic CSI reporting sent by the first base station;

Instructing the sending unit to send the request for triggering aperiodic CSI reporting to the user equipment, so that the user equipment reports the aperiodic CSI related to the first base station.

According to another aspect of the embodiments of the present invention, a communication system is provided, including the above user equipment; or including the above user equipment and a base station.

According to yet another aspect of the embodiments of the present invention, there is provided a computer-readable program, wherein when the program is executed in the base station, the program causes the computer to execute the method for sending uplink control information as described above in the base station .

According to yet another aspect of the embodiments of the present invention, there is provided a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the above-mentioned method for sending uplink control information in a base station.

According to still another aspect of the embodiments of the present invention, there is provided a computer-readable program, wherein when the program is executed in the user equipment, the program causes the computer to perform the above-mentioned uplink control information processing in the user equipment. sending method.

According to yet another aspect of the embodiments of the present invention, there is provided a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the above-mentioned method for sending uplink control information in a user equipment.

The beneficial effect of the embodiments of the present invention is that by increasing the interactive signaling between base stations or between the base station and the user equipment, and the user equipment sends uplink control information to the second base station, the second base station forwards the uplink control information to the first base station, or The first base station obtains the uplink control information through monitoring; not only can the correct reception of the uplink control information be ensured by the base station, but also multiple possible ways of sending the control information can be avoided, reducing the complexity of the base station receiving the uplink control information.

With reference to the following description and accompanying drawings, there are disclosed in detail specific embodiments of the invention, indicating the manner in which the principles of the invention may be employed. It should be understood that embodiments of the invention are not limited thereby in scope. Embodiments of the invention encompass many changes, modifications and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

Many aspects of the invention can be better understood with reference to the following figures. The components in the figures are not drawn to scale, merely illustrating the principles of the invention. In order to facilitate illustration and description of some parts of the present invention, corresponding parts in the drawings may be exaggerated or reduced.

Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, like numerals indicate corresponding parts in the several figures and may be used to indicate corresponding parts used in more than one embodiment.

FIG. 1 is a schematic diagram of a user equipment maintaining connection with a macro base station and a small base station;

FIG. 2 is a schematic flowchart of a method for sending uplink control information according to Embodiment 1 of the present invention;

3 is a schematic flowchart of a method for sending uplink control information according to Embodiment 2 of the present invention;

FIG. 4 is a schematic flowchart of a method for sending uplink control information according to Embodiment 3 of the present invention;

FIG. 5 is another schematic flowchart of a method for sending uplink control information according to Embodiment 3 of the present invention;

FIG. 6 is a schematic diagram of a scenario of a method for sending uplink control information according to Embodiment 3 of the present invention;

FIG. 7 is another schematic flowchart of a method for sending uplink control information according to Embodiment 3 of the present invention;

FIG. 8 is a schematic structural diagram of a user equipment according to Embodiment 4 of the present invention;

FIG. 9 is a schematic structural diagram of a user equipment according to Embodiment 5 of the present invention;

FIG. 10 is a schematic structural diagram of a user equipment according to Embodiment 6 of the present invention;

FIG. 11 is a schematic diagram of a structure of a base station according to Embodiment 6 of the present invention;

Fig. 12 is a schematic diagram of the structure of a communication system according to Embodiment 7 of the present invention.

Detailed ways

The foregoing and other features of the invention will become apparent from the following description, taken with reference to the accompanying drawings. In the specification and drawings, specific embodiments of the invention are disclosed, which illustrate some embodiments in which the principles of the invention may be employed. It is to be understood that the invention is not limited to the described embodiments, but rather, the invention The invention includes all modifications, variations and equivalents that come within the scope of the appended claims.

In the present invention, user equipment can be connected to one or more macro base stations at the same frequency point, and simultaneously connected to one or more small base stations at the same frequency point. The uplink control information of each base station at the same frequency point can be sent according to an existing standard, or according to a newly defined method.

On the base station to which the user equipment is connected, each base station may configure single or multiple carriers. The uplink control information of multiple carriers on one base station can be sent according to existing standards, or according to a newly defined method. Hereinafter, the user equipment is described as an example of maintaining connection with the first base station and the second base station, but the present invention is not limited thereto, for example, it may also maintain connection with more than two base stations.

Example 1

An embodiment of the present invention provides a method for sending uplink control information, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station. FIG. 2 is a schematic flowchart of a method for sending uplink control information according to an embodiment of the present invention. As shown in FIG. 2 , the sending method includes:

Step 201, the user equipment sends uplink control information to the second base station, so that the second base station forwards the uplink control information to the first base station, or the first base station obtains the uplink control information by monitoring;

Wherein, the format of the PUCCH carrying the uplink control information has nothing to do with whether there is PDSCH scheduling on one or more carriers; or the resource carrying the uplink control information has nothing to do with whether the PUSCH is used for the random access process.

Specifically, the uplink control information includes ACK/NACK, and the user equipment carries the ACK/NACK through a PUCCH format that has nothing to do with the corresponding PDSCH transmission on which carriers; or, the uplink control information includes CSI, and the user equipment uses a or, the uplink control information includes a scheduling request, and the user equipment carries the scheduling request through a PUCCH format that has nothing to do with whether ACK/NACK is included; or, the uplink control information includes CSI and/or ACK/NACK, and the user equipment uses the PUSCH Whether to use resources irrelevant to the random access process to carry CSI and/or ACK/NACK.

In this embodiment, at a certain moment, the user equipment is connected to the second base station and has an uplink, and the user equipment can use the uplink to send uplink control information; wherein the uplink control information may include information related to the second base station , and/or information related to the first base station. After receiving the uplink control information, the second base station may forward it to the first base station; or, the first base station may obtain the uplink control information sent by the user equipment through monitoring.

In this embodiment, there may be a non-ideal loop between the first base station and the second base station, so that each base station cannot learn the real-time scheduling information of other base stations. ACK/NACK is carried in a PUCCH format independent of which carriers have corresponding PDSCH transmissions, or CSI is carried in resources independent of whether ACK/NACK is included, or a scheduling request is carried in a PUCCH format independent of ACK/NACK, or Carrying CSI and/or ACK/NACK through resources irrelevant to whether the PUSCH is used for the random access process; can avoid multiple possible ways of sending control information.

For example, regarding the reception at the base station side, an implementation method may be: if the base station side can know the scheduling situation of the PUSCH, for example, whether there is a PUSCH transmission at time n, then according to the situation of having a PUSCH and not having a PUSCH, priority can be given according to the corresponding way to receive. If the base station side cannot know the scheduling situation of the PUSCH, it needs to detect respectively according to the possibility of two situations at most. Therefore, the complexity of receiving uplink control information at the base station side can be reduced.

In one embodiment, the user equipment is configured to be capable of simultaneously supporting more than two downlink carrier feedback PUCCH formats. For example, the user equipment can be configured to use PUCCH format 3, or other PUCCH format X that can simultaneously support ACK/NACK feedback of more than two downlink carriers.

If the user equipment is also configured to be able to send PUCCH and PUSCH at the same time; then in the case that only ACK/NACK needs to be reported, the user equipment uses the PUCCH format that can support feedback of more than two downlink carriers at the same time, carrying one or more downlink carriers. ACK/NACK. Wherein, the user equipment will not adopt different PUCCH formats according to whether the PDSCH is detected on only one downlink carrier or the PDSCH is detected on multiple downlink carriers.

Specifically, if at time n, only ACK/NACK needs to be reported without periodic CSI or SR, the user equipment can use PUCCH format 3 or PUCCH format X to send ACK/NACK of one or more downlink carriers, even if the user equipment At a corresponding moment, for example, n-z (z>=4), the device only receives the PDSCH on the main carrier, but does not receive the PDSCH on other carriers.

A typical scenario in this embodiment may be a scenario where the user equipment only sends an uplink signal to one base station, but multiple base stations receive it at the same time; or a scenario where the user equipment only sends an uplink signal to one base station, and the base station forwards it to other base stations. In addition, this embodiment is applicable to the situation that there may be uplink PUSCH transmission at the same time, and it is also applicable to the situation that only PUCCH is transmitted. The present invention is not limited thereto, and specific scenarios or situations may be determined according to actual conditions.

In another embodiment, the user equipment is configured to be able to support more than two downlink carrier feedback PUCCH formats at the same time, and to be able to send PUCCH and PUSCH at the same time. In the case that the uplink control information includes periodic CSI, the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to carry the uplink control information.

Specifically, periodic CSI is carried by PUCCH format 3/X, regardless of whether ACK/NACK or SR is included, or whether there is PUSCH transmission. In addition, if the uplink control information overhead exceeds the maximum overhead of PUCCH format 3/X, the user equipment will drop periodic CSI and only send ACK/NACK and/or SR.

A typical scenario in this embodiment may be a scenario where the user equipment only sends an uplink signal to one base station, but multiple base stations receive it at the same time; or a scenario where the user equipment only sends an uplink signal to one base station, and the base station forwards it to other base stations. In addition, this embodiment is applicable to the situation that there may be uplink PUSCH transmission at the same time, and it is also applicable to the situation that only PUCCH is transmitted. If there is a possibility of PUSCH transmission at the same time, then PUSCH will also be transmitted.

Or, in this embodiment, if the PUSCH is not sent, and the overhead of the uplink control information exceeds the maximum overhead of the PUCCH format, the user equipment discards the periodic CSI; if the PUSCH is sent, the user equipment multiplexes the periodic CSI into the PUSCH .

Specifically, if there is no PUSCH transmission, the periodic CSI is carried by the PUCCH format 3/X, no matter whether there is ACK/NACK and/or SR. If the uplink control information overhead exceeds the maximum overhead of PUCCH format 3/X, the user will drop periodic CSI and only send ACK/NACK and/or SR. If there is a PUSCH to be sent, the periodic CSI is multiplexed into the PUSCH and sent, no matter whether there is ACK/NACK or not.

In another embodiment, the user equipment is configured to support more than two PUCCH formats fed back by downlink carriers at the same time; the uplink control information includes SR.

Specifically, this implementation manner may reuse existing technologies. For example, if there is only SR, use PUCCH format 1 to carry it; if the user equipment only receives PDSCH on the main carrier, use PUCCH format 1a/1b to carry SR+ACK/NACK; if it receives PDSCH on other carriers, use PUCCH format 3/X carries SR+ACK/NACK.

Or, in the case that only the scheduling request needs to be reported, the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to carry the SR.

Specifically, if there is only SR, the user equipment can send SR through PUCCH format 3/X, regardless of whether there is ACK/NACK.

Alternatively, when only scheduling requests need to be reported, the user equipment uses a PUCCH format that supports up to two downlink carrier feedbacks to bear SR at the same time; and when the uplink control information includes SR and ACK/NACK, the user equipment uses the The PUCCH format fed back by more than two downlink carriers carries uplink control information.

Specifically, if there is only SR, the user equipment can send SR through PUCCH format 1; if there is ACK/NACK at the same time, use PUCCH format 3/X to bear, even if the user equipment only receives PDSCH on the main carrier.

The typical scenario of the above three methods in this embodiment may be a scenario where the user equipment only sends uplink signals to one base station, but multiple base stations receive them at the same time; or the user equipment only sends uplink signals to one base station, and the base station transmits uplink signals to other base stations forwarded scene. The present invention is not limited thereto, and specific scenarios or situations may be determined according to actual conditions.

The above describes the case where the user equipment is configured to support more than two PUCCH formats fed back by downlink carriers at the same time, and to simultaneously transmit the PUCCH and the PUSCH. But the present invention is not limited thereto, for example, uplink control information may also be combined.

For example, if the uplink control information includes ACK/NACK and SR, the PUCCH format 3/X can be used to carry it, even if the user equipment only receives the PDSCH on the primary carrier. If the uplink control information includes periodic CSI and ACK/NACK, it can be carried in PUCCH format 3/X, or the periodic CSI can be multiplexed into PUSCH. If the uplink control information includes periodic CSI and SR, it can be carried in PUCCH format 3/X. If the uplink control information includes ACK/NACK, periodic CSI and SR, it can still be carried in PUCCH format 3/X.

The following describes the case where the user equipment is configured to support more than two downlink carrier feedback PUCCH formats at the same time, and cannot send the PUCCH and PUSCH at the same time.

In one embodiment, when the uplink control information is only related to the second base station, the user equipment carries the uplink control information in the PUSCH; Information is carried in PUCCH.

In addition, in the case that only ACK/NACK needs to be reported, the user equipment uses a PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to carry ACK/NACK of one or more downlink carriers.

Specifically, if it is not possible to send PUSCH at time n, the user equipment may use PUCCH format 3 or PUCCH format X to send ACK/NACK of a single or multiple downlink carriers. If it is possible to send PUSCH at time n, if it only contains uplink control information related to the second base station (ie, a base station with an uplink between user equipments), then the uplink control information is sent in PUSCH. If it is possible to send PUSCH at time n, if it contains uplink control information related to the first base station, the user equipment will not send PUSCH, only PUCCH; and, user equipment can use PUCCH format 3 or PUCCH format X to send single or multiple downlinks Carrier ACK/NACK.

A typical scenario in this embodiment may be a scenario where the user equipment only sends an uplink signal to one base station, but multiple base stations receive it at the same time. However, the present invention is not limited thereto, and specific scenarios or situations may be determined according to actual conditions.

In another implementation manner, all uplink control information may be multiplexed into the PUSCH completely according to the existing standard.

In another embodiment, if the uplink control information includes ACK/NACK and SR, or includes periodic CSI and ACK/NACK, or includes periodic CSI and SR, or includes ACK/NACK, periodic CSI and SR, then still The above method can be adopted, that is: when the uplink control information is only related to the second base station, the user equipment carries the uplink control information in the PUSCH; when the uplink control information is also related to the first base station, the user equipment will uplink Control information is carried in PUCCH. As for how to use the PUSCH or the PUCCH specifically, the prior art or the implementation manners described above may be used.

The following describes the case that the user equipment is not configured to support more than two downlink carrier feedback PUCCH formats simultaneously, and can simultaneously send the PUCCH and the PUSCH. Specifically, the user equipment is not configured with PUCCH format 3 or other PUCCH format X that can simultaneously support ACK/NACK feedback of more than 2 downlink carriers, for example, it is configured with PUCCH format 1a/1b.

In one embodiment, when the uplink control information includes periodic CSI related to the first base station, the user equipment uses PUCCH format 2/2a/2b to carry periodic CSI; when the uplink control information includes the periodic CSI related to the second base station In the case of ACK/NACK, the user equipment multiplexes the ACK/NACK related to the second base station into the PUSCH.

Specifically, if there is periodic CSI of the first base station, the user equipment will use PUCCH format 2/2a/2b to send periodic CSI, or can send periodic CSI together with ACK/NACK. If there is an ACK/NACK of the second base station, the ACK/NACK of the second base station will be multiplexed into the PUSCH.

In another embodiment, when the uplink control information includes periodic CSI related to the first base station and ACK/NACK related to the second base station, the user equipment uses PUCCH format 2/2a/2b to carry the periodic CSI and ACK/NACK; or when the uplink control information includes periodic CSI related to the first base station and ACK/NACK related to multiple base stations, the user equipment discards the periodic CSI and uses PUCCH format 1a/1b to carry ACK/NACK NACK.

Specifically, if there is periodic CSI of the first base station and ACK/NACK of the second base station, the user equipment will use PUCCH format 2a/2b to carry the CSI and ACK/NACK.

If there is periodic CSI of the first base station and ACK/NACK of multiple base stations, the user equipment will discard the periodic CSI and use PUCCH format 1a/1b channel selection to send ACK/NACK.

If there is periodic CSI of the second base station, the existing technology can be used. For example, if there is a PUSCH to send, the periodic CSI is multiplexed into the PUSCH, and the PUCCH format 1a/1b channel is used to select and send ACK/NACK.

A typical scenario in this embodiment may be a scenario where the user equipment only sends an uplink signal to one base station, but multiple base stations receive it at the same time. However, the present invention is not limited thereto, and specific scenarios or situations may be determined according to actual conditions.

In another embodiment, the user equipment uses PUSCH to carry periodic CSI; and in the case that the uplink control information includes ACK/NACK, the user equipment uses PUCCH format 1a/1b to carry ACK/NACK.

Specifically, the user equipment will send periodic CSI in the PUSCH, no matter whether the periodic CSI is the CSI of the first base station or the CSI of the second base station. Also, if there is ACK/NACK, it is sent in PUCCH Format 1a/1b channel selection.

A typical scenario in this embodiment may be a scenario where the user equipment only sends an uplink signal to one base station, and the base station forwards the signal to other base stations. However, the present invention is not limited thereto, and specific scenarios or situations may be determined according to actual conditions.

As for the situation that the user equipment is not configured to support more than two downlink carrier feedback PUCCH formats simultaneously, and cannot transmit PUCCH and PUSCH at the same time, the existing technology may be used, which will not be repeated here.

It can be known from the above embodiments that ACK/NACK is carried by the PUCCH format that has nothing to do with the corresponding PDSCH transmission on which carriers, or CSI is carried by resources that are not related to whether ACK/NACK is included, or by PUCCH that is not related to whether ACK/NACK is included. The format carries the scheduling request, or carries the CSI and/or ACK/NACK through resources that have nothing to do with whether the PUSCH is used for the random access process; it can avoid multiple possible ways to send control information, and reduce the complexity of receiving uplink control information on the base station side Spend.

Example 2

An embodiment of the present invention provides a method for sending uplink control information, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station. FIG. 3 is a schematic flowchart of a method for sending uplink control information according to an embodiment of the present invention. As shown in FIG. 3 , the sending method includes:

Step 301, the user equipment sends periodic CSI to the second base station according to the periodic configuration, so that the second base station forwards the periodic CSI to the first base station, or the first base station obtains the periodic CSI by monitoring; wherein the periodic configuration includes 4ms or 8Nms; Where N is a positive integer, N=1, 2, 3....

In this embodiment, at a certain moment, the user equipment is connected to the second base station and has an uplink, and the user equipment can use the uplink to send uplink control information; wherein the uplink control information may include information related to the second base station , and/or information related to the first base station. After receiving the uplink control information, the second base station may forward it to the first base station; or, the first base station may obtain the uplink control information sent by the user equipment through monitoring.

In this embodiment, there may be a non-ideal loop between the first base station and the second base station, so that each base station cannot learn the real-time scheduling information of other base stations. The user equipment can be connected to the first base station and the second base station in a time division multiplexing (TDM, Time Division Multiple) manner, that is, the user equipment accesses different base stations in turn in a time division manner to obtain corresponding uplink control information.

In this embodiment, the periodic configuration of the periodic CSI report may be added. For example, increase the cycle configuration of 4ms, 8ms, 16ms, 32ms.... For example, the value of _ICQI/PMI from 542 to 1023 in the existing standard can be used, and both Frequency Division Duplex (FDD, Frequency Division Duplex) and Time Division Duplex (TDD, Time Division Duplex) are applicable. Table 1 and Table 2 show the cases for FDD and TDD, respectively.

Table 1 For FDD, the mapping of I _CQI/PMI to N _pd and N _{OFFSET, CQI}

As shown in Table 1, content can be added on the basis of Table 7.2.2-1A. Regarding the meaning of I _CQI/PMI , N _pd and N _{OFFSET, CQI} , etc., reference may be made to existing standards.

Table 2 For TDD, mapping of I _CQI/PMI to N _pd and N _{OFFSET, CQI}

As shown in Table 2, content can be added on the basis of Table 7.2.2-1C. It should be noted that Tables 1 and 2 only schematically show the periodic configuration of adding periodic CSI reporting. However, the present invention is not limited thereto. For example, specific mapping relationships or values may be adjusted on the basis of Table 1 or 2, and specific implementation manners may be determined according to actual conditions.

In this embodiment, by adding the periodic configuration of the periodic CSI, it can be applied to a scenario where the user equipment maintains connections with at least two base stations including the first base station and the second base station. For example, if the period of the TDM method is 8ms, after adding the period of periodic CSI to 4ms or 8Nms, it can be consistent with the TDM method, thereby reducing the situation of incorrect demodulation of periodic CSI and improving the efficiency of receiving periodic CSI at the base station side .

Example 3

An embodiment of the present invention provides a method for sending uplink control information, wherein a user equipment maintains a connection with at least two base stations including a first base station and a second base station. Fig. 4 is a schematic flowchart of a method for sending uplink control information according to an embodiment of the present invention, and is described from a user equipment side. As shown in Figure 4, the sending method includes:

Step 401, the user equipment receives a request for triggering aperiodic CSI reporting sent by a second base station;

Step 402, the user equipment reports the aperiodic CSI related to the first base station, so that the second base station forwards the aperiodic CSI to the first base station, or the first base station obtains the aperiodic CSI through monitoring.

Fig. 5 is another schematic flowchart of the method for sending uplink control information according to an embodiment of the present invention, which is described from the side of the second base station. As shown in Figure 5, the sending method includes:

Step 501, the second base station receives a request for triggering aperiodic CSI reporting sent by the first base station;

Step 502, the second base station sends a request to trigger aperiodic CSI reporting to the user equipment, so that the user equipment reports aperiodic CSI related to the first base station.

In this embodiment, there may be a non-ideal loop between the first base station and the second base station, so that each base station cannot learn the real-time scheduling information of other base stations. At a certain moment, the user equipment is connected to the second base station and has an uplink, and the user equipment can use the uplink to send uplink control information; wherein the uplink control information may include information related to the second base station, and/or related to the second base station Information related to a base station. After receiving the uplink control information, the second base station may forward it to the first base station; or, the first base station may obtain the uplink control information sent by the user equipment through monitoring.

Specifically, when the first base station expects the user equipment to report the downlink carrier aperiodic CSI of the first base station, the first base station sends a request to trigger aperiodic CSI reporting to the second base station. The second base station is a base station maintaining an uplink connection with the user equipment, and the user equipment can send uplink signals on an uplink carrier of the second base station. After receiving the request from the first base station, the second base station may use downlink control information (DCI, Downlink Control Information) to trigger the user equipment to report the aperiodic CSI of the downlink carrier under the first base station requested by the first base station. After receiving the aperiodic CSI, the second base station forwards the CSI report information to the first base station.

Fig. 6 is a schematic diagram of a scenario of a method for sending uplink control information according to an embodiment of the present invention. As shown in FIG. 6 , the user equipment can maintain connection with the base station 1 and the base station; the base station 2 can communicate through the frequency f1, and the base station 1 can communicate through the frequency f1/f2. For example, at a certain moment, there is an uplink between the base station 2 and the user equipment.

Fig. 7 is another schematic flowchart of the method for sending uplink control information according to an embodiment of the present invention, showing the interaction between the first base station, the second base station, and the user equipment. As shown in Figure 7, the method includes:

Step 701, the first base station sends a request to trigger aperiodic CSI reporting to the second base station.

Specifically, the second base station is a base station maintaining an uplink connection with the user equipment, such as a macro base station MeNB; the first base station is, for example, a small base station SeNB. The user equipment may send an uplink signal on the uplink carrier of the second base station.

Step 702, after receiving the request from the first base station, the second base station sends an instruction to trigger aperiodic CSI reporting to the user equipment.

Specifically, the DCI may be used to trigger the user equipment to report the aperiodic CSI requested by the first base station. For example, it can be indicated by 2 bits, "00" means not to send, "01" means to send the aperiodic CSI of the first base station, "10" means to send the aperiodic CSI of the second base station, and "11" means to send the first Aperiodic CSI of the base station and the second base station. But the present invention is not limited thereto, for example, other ways may also be used for indication.

Step 703, the user equipment reports the aperiodic CSI of the first base station according to the instruction.

In one embodiment, optionally, the method may also include:

Step 704: After receiving the aperiodic CSI, the second base station forwards the aperiodic CSI report information to the first base station.

In another implementation manner, the first base station may receive the aperiodic CSI sent by the user equipment through monitoring. For example, the first base station receives the report information on the frequency point f1 of the second base station.

In this embodiment, the second base station may also receive information related to the aperiodic CSI sent by the first base station, so that the second base station correctly demodulates the aperiodic CSI.

Specifically, in order to ensure correct reception by the second base station, it may be necessary for the second base station to exchange time-frequency resource information of the aperiodic CSI to be sent by the UE with the first base station. The first base station may inform the second base station of relevant information about the aperiodic CSI, so that the second base station can correctly demodulate the aperiodic CSI and PUSCH. Wherein, the information related to the aperiodic CSI may include one or a combination of the following information: the total number of bits of the aperiodic CSI, the type of the aperiodic CSI, the bandwidth of the downlink carrier, the maximum possible rank of the downlink carrier and whether to configure Information about the PMI feedback value.

For example, the overhead of aperiodic CSI can be informed, that is, the total number of bits; for example, the type of aperiodic CSI needs to be informed, including 1-2, 2-0, 2-2, 3-0, 3-1, 3-2 and other possible types. It can also inform the bandwidth of the downlink carrier, the possible maximum rank, whether to configure the feedback value of PMI, etc. The present invention is not limited thereto, and specific interactive content may be determined according to actual needs.

It can be seen from the above embodiments that by increasing the interactive signaling between base stations or between the base station and the user equipment, not only can the correct reception of the aperiodic CSI at the base station side be ensured, but also the complexity of information received by the base station can be reduced.

Example 4

An embodiment of the present invention provides a user equipment that maintains a connection with at least two base stations including a first base station and a second base station. This embodiment corresponds to the method for sending uplink control information in Embodiment 1, and the same content will not be described again.

FIG. 8 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 8 , the user equipment 800 includes: an information sending unit 801 . Other parts of the user equipment 800 are not shown, and reference may be made to the prior art.

Wherein, the information sending unit 801 sends uplink control information to the second base station, so that the second base station forwards the uplink control information to the first base station, or the first base station obtains the uplink control information by monitoring;

Wherein, the format of the PUCCH carrying the uplink control information has nothing to do with whether there is PDSCH scheduling on one or more carriers; or the resource carrying the uplink control information has nothing to do with whether the PUSCH is used for the random access process.

Specifically, the uplink control information includes ACK/NACK, and the information sending unit 801 carries the ACK/NACK through the PUCCH format that has nothing to do with the corresponding PDSCH transmission on which carriers; or, the uplink control information includes CSI, and the information sending unit 801 uses whether it contains ACK/NACK-independent resources carry CSI; or, the uplink control information includes a scheduling request, and the information sending unit 801 carries the scheduling request through a PUCCH format that is independent of whether ACK/NACK is included; or, the uplink control information includes CSI and/or ACK/NACK , the information sending unit 801 carries the CSI and/or ACK/NACK through resources irrelevant to whether the PUSCH is used for the random access process.

It can be known from the above embodiments that ACK/NACK is carried by the PUCCH format that has nothing to do with the corresponding PDSCH transmission on which carriers, or CSI is carried by resources that are not related to whether ACK/NACK is included, or by PUCCH that is not related to whether ACK/NACK is included. The format carries the scheduling request, or carries the CSI and/or ACK/NACK through resources that have nothing to do with whether the PUSCH is used for the random access process; it can avoid multiple possible ways to send control information, and reduce the complexity of receiving uplink control information on the base station side Spend.

Example 5

An embodiment of the present invention provides a user equipment that maintains a connection with at least two base stations including a first base station and a second base station. This embodiment corresponds to the method for sending uplink control information in Embodiment 2, and the same content will not be repeated here.

FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 9 , the user equipment 900 includes: an information sending unit 901 . Other parts of the user equipment 900 are not shown, and reference may be made to the prior art.

Wherein, the information sending unit 901 sends periodic CSI to the second base station according to the periodic configuration, so that the second base station forwards the periodic CSI to the first base station, or the first base station obtains the periodic CSI by monitoring; wherein the periodic configuration includes 4ms or 8Nms ; where N is a positive integer.

In this embodiment, by adding the periodic configuration of the periodic CSI, it can be applied to a scenario where the user equipment maintains connections with at least two base stations including the first base station and the second base station. For example, if the period of the TDM method is 8ms, after adding the period of periodic CSI to 4ms or 8Nms, it can be consistent with the TDM method, thereby reducing the situation of incorrect demodulation of periodic CSI and improving the efficiency of receiving periodic CSI at the base station side .

Example 6

Embodiments of the present invention provide user equipment and a base station, where the user equipment is kept connected to at least two base stations including a first base station and the base station. This embodiment corresponds to the method for sending uplink control information in Embodiment 3, and the same content will not be described again.

FIG. 10 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 10 , the user equipment 1000 includes: an indication receiving unit 1001 and an information reporting unit 1002 . Other parts of the user equipment 1000 are not shown, and reference may be made to the prior art.

Wherein, the instruction receiving unit 1001 receives an instruction to trigger aperiodic CSI reporting sent by the second base station; the information reporting unit 1002 reports the aperiodic CSI related to the first base station, so that the second base station forwards the aperiodic CSI to the first base station , or the first base station obtains the aperiodic CSI by monitoring.

FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 11 , the base station 1100 includes: a request receiving unit 1101 and an instruction sending unit 1102 . For other parts not shown in the figure of the base station 1100 , reference may be made to the prior art.

Wherein, the request receiving unit 1101 receives the request for triggering aperiodic CSI reporting sent by the first base station; the instruction sending unit 1102 sends an indication of triggering aperiodic CSI reporting to the user equipment, so that the user equipment reports the aperiodic CSI report related to the first base station. Sexual CSI.

In an embodiment, the base station 1100 may further include: an information receiving unit and an information forwarding unit. The information receiving unit receives the aperiodic CSI related to the first base station sent by the user equipment; the information forwarding unit forwards the aperiodic CSI to the first base station.

It can be seen from the above embodiments that by increasing the interactive signaling between base stations or between the base station and the user equipment, not only can the correct reception of the aperiodic CSI at the base station side be ensured, but also the complexity of information received by the base station can be reduced.

Example 7

An embodiment of the present invention provides a communication system, including the user equipment described in Embodiment 4; or including the user equipment described in Embodiment 5; or including the user equipment described in Embodiment 6 and a base station.

FIG. 12 is a schematic diagram of the structure of a communication system according to an embodiment of the present invention. As shown in FIG. 12 , the communication system 1200 includes a first base station, a second base station, and user equipment. The first base station or the second base station may be a macro base station or a small base station, and the present invention is not limited thereto.

An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the user equipment, the program causes the computer to execute the uplink control information described in the above embodiments 1-3 in the user equipment sending method.

An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein the computer-readable program enables the computer to execute the method for sending uplink control information as described in Embodiments 1-3 above in the user equipment.

An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the base station, the program causes the computer to execute the method for sending uplink control information as described in Embodiment 3 above in the base station.

An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method for sending uplink control information as described in Embodiment 3 above in a base station.

The above devices and methods of the present invention can be implemented by hardware, or by combining hardware and software. The present invention relates to such a computer-readable program that, when the program is executed by a logic component, enables the logic component to realize the above-mentioned device or constituent component, or enables the logic component to realize the above-mentioned various methods or steps. The present invention also relates to a storage medium for storing the above program, such as hard disk, magnetic disk, optical disk, DVD, flash memory and the like.

One or more of the functional blocks described in the accompanying drawings and/or one or more combinations of the functional blocks can be implemented as a general-purpose processor, a digital signal processor (DSP) for performing the functions described in this application ), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof. One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors processor, one or more microprocessors in communication with a DSP, or any other such configuration.

The present invention has been described above in conjunction with specific embodiments, but those skilled in the art should be clear that these descriptions are all exemplary and not limiting the protection scope of the present invention. Those skilled in the art can make various variations and modifications to the present invention according to the spirit and principle of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims (29)

1. A method for sending uplink control information, wherein the user equipment maintains a connection with at least two base stations including a first base station and a second base station, the sending method comprising: The user equipment sends uplink control information to the second base station, so that the second base station forwards the uplink control information to the first base station, or the first base station obtains the uplink control information by monitoring; Wherein, the format of the PUCCH carrying the uplink control information has nothing to do with whether there is PDSCH scheduling on one or more carriers; or the resource carrying the uplink control information has nothing to do with whether the PUSCH is used for a random access process. 2. The method according to claim 1, wherein the uplink control information includes ACK/NACK, and the user equipment bears the ACK/NACK through a PUCCH format that has nothing to do with the corresponding PDSCH transmission on which carriers; Or, the uplink control information includes CSI, and the user equipment bears the CSI through resources that are not related to whether ACK/NACK is included; Or, the uplink control information includes a scheduling request, and the user equipment carries the scheduling request through a PUCCH format that is irrelevant to whether ACK/NACK is included; Alternatively, the uplink control information includes CSI and/or ACK/NACK, and the user equipment bears the CSI and/or ACK/NACK through a resource that is not related to whether the PUSCH is used for a random access procedure. 3. The method according to claim 1, wherein the user equipment is configured to be capable of simultaneously supporting more than two downlink carrier feedback PUCCH formats, and capable of simultaneously sending PUCCH and PUSCH; In the case that only ACK/NACK needs to be reported, the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to bear ACK/NACK of one or more downlink carriers. 4. The method according to claim 3, wherein the user equipment does not adopt different PUCCH formats according to whether PDSCH is detected on only one downlink carrier or PDSCH is detected on multiple downlink carriers. 5. The method according to claim 1, wherein the user equipment is configured to be able to simultaneously support more than two downlink carrier feedback PUCCH formats, and to be able to send PUCCH and PUSCH at the same time, and be configured to be able to send ACK/ NACK and CSI; In the case that the uplink control information includes periodic CSI, no matter whether the uplink control information includes ACK/NACK, the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to carry the uplink control information. 6. The method of claim 5, wherein the method further comprises: If no PUSCH is sent, and the overhead of the uplink control information exceeds the maximum overhead of the PUCCH format, the user equipment discards the periodic CSI; If PUSCH is sent, the user equipment multiplexes the periodic CSI into the PUSCH. 7. The method according to claim 1, wherein the user equipment is configured to be capable of simultaneously supporting more than two PUCCH formats fed back by downlink carriers; In the case that only the scheduling request needs to be reported, the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to bear the scheduling request; or In the case that only the scheduling request needs to be reported, the user equipment uses the PUCCH format that supports up to two downlink carrier feedbacks at the same time to bear the scheduling request; and when the uplink control information includes the scheduling request and ACK/NACK , the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to carry the uplink control information. 8. The method according to claim 1, wherein the user equipment is configured to support more than two downlink carrier feedback PUCCH formats at the same time, and cannot transmit PUCCH and PUSCH at the same time; In the case that the uplink control information is only related to the second base station, the user equipment carries the uplink control information in a PUSCH; In a case that the uplink control information is also related to the first base station, the user equipment carries the uplink control information in a PUCCH. 9. The method of claim 8, wherein the method further comprises: In the case that only ACK/NACK needs to be reported, the user equipment uses the PUCCH format capable of simultaneously supporting feedback of more than two downlink carriers to bear ACK/NACK of one or more downlink carriers. 10. The method according to claim 1, wherein the user equipment is configured to be capable of simultaneously supporting up to two PUCCH formats fed back by downlink carriers, and capable of simultaneously sending PUCCH and PUSCH; If the uplink control information includes periodic CSI related to the first base station, the user equipment uses PUCCH format 2/2a/2b to bear the periodic CSI; If the uplink control information includes the ACK/NACK related to the second base station, the user equipment multiplexes the ACK/NACK related to the second base station into a PUSCH. 11. The method according to claim 1, wherein the user equipment is configured to be capable of simultaneously supporting up to two PUCCH formats fed back by downlink carriers, and capable of simultaneously sending PUCCH and PUSCH; In the case that the uplink control information includes periodic CSI related to the first base station and ACK/NACK related to the second base station, the user equipment uses PUCCH format 2/2a/2b to carry the periodic sex CSI and the ACK/NACK; or If the uplink control information includes periodic CSI related to the first base station and ACK/NACK related to multiple base stations, the user equipment discards the periodic CSI and uses a PUCCH format for channel selection 1a/1b bears the ACK/NACK. 12. The method according to claim 1, wherein the user equipment is configured to be capable of simultaneously supporting up to two PUCCH formats fed back by downlink carriers, and capable of simultaneously sending PUCCH and PUSCH; The user equipment uses PUSCH to carry periodic CSI; and In the case that the uplink control information includes ACK/NACK, the user equipment uses channel selected PUCCH format 1a/1b to bear the ACK/NACK. 13. A method for sending uplink control information, wherein the user equipment maintains a connection with at least two base stations including a first base station and a second base station, the sending method comprising: The user equipment sends periodic CSI to the second base station according to the periodic configuration, so that the second base station forwards the periodic CSI to the first base station, or the first base station obtains the periodic CSI by monitoring sexual CSI; Wherein the cycle configuration includes 4ms or 8Nms; where N is a positive integer. 14. A method for sending uplink control information, wherein the user equipment maintains a connection with at least two base stations including a first base station and a second base station, the sending method comprising: The user equipment receives a request for triggering aperiodic CSI reporting sent by the second base station; The user equipment reports the aperiodic CSI related to the first base station, so that the second base station forwards the aperiodic CSI to the first base station, or the first base station obtains the aperiodic CSI by monitoring Aperiodic CSI. 15. The method according to claim 14, wherein the user equipment reports the aperiodic CSI on an uplink carrier of the second base station. 16. A method for sending uplink control information, wherein the user equipment maintains a connection with at least two base stations including a first base station and a second base station, the sending method comprising: The second base station receives a request for triggering aperiodic CSI reporting sent by the first base station; Sending the request for triggering aperiodic CSI reporting to the user equipment, so that the user equipment reports aperiodic CSI related to the first base station. 17. The method of claim 16, wherein the method further comprises: The second base station receives the aperiodic CSI related to the first base station sent by the user equipment; The second base station forwards the aperiodic CSI to the first base station. 18. The method of claim 16, wherein the method further comprises: The second base station receives the information related to the aperiodic CSI sent by the first base station, so that the second base station correctly demodulates the aperiodic CSI. 19. The method according to claim 18, wherein the information related to the aperiodic CSI includes one or a combination of the following: the total number of bits of the aperiodic CSI, the type of the aperiodic CSI , the bandwidth of the downlink carrier, the possible maximum rank of the downlink carrier, and information about whether to configure the PMI feedback value. 20. A user equipment that maintains connections with at least two base stations including a first base station and a second base station, the user equipment comprising: an information sending unit, configured to send uplink control information to the second base station, so that the second base station forwards the uplink control information to the first base station, or the first base station obtains the uplink control information by monitoring; Wherein, the format of the PUCCH carrying the uplink control information has nothing to do with whether there is PDSCH scheduling on one or more carriers; or the resource carrying the uplink control information has nothing to do with whether the PUSCH is used for a random access process. 21. A user equipment that maintains connections with at least two base stations including a first base station and a second base station, the user equipment comprising: An information sending unit, which sends periodic CSI to the second base station according to the periodic configuration, so that the second base station forwards the periodic CSI to the first base station, or the first base station obtains the periodic CSI by monitoring sexual CSI; Wherein the cycle configuration includes 4ms or 8Nms; where N is a positive integer. 22. A user equipment that maintains connections with at least two base stations including a first base station and a second base station, the user equipment comprising: instructing the receiving unit to receive an indication of triggering aperiodic CSI reporting sent by the second base station; an information reporting unit, for reporting the aperiodic CSI related to the first base station, so that the second base station forwards the aperiodic CSI to the first base station, or the first base station obtains the aperiodic CSI by monitoring Aperiodic CSI. 23. A base station, wherein the user equipment maintains a connection with at least two base stations comprising a first base station and said base station, said base station comprising: a request receiving unit, configured to receive a request for triggering aperiodic CSI reporting sent by the first base station; Instructing the sending unit to send the request for triggering aperiodic CSI reporting to the user equipment, so that the user equipment reports the aperiodic CSI related to the first base station. 24. The base station according to claim 23, wherein the base station further comprises: an information receiving unit, configured to receive the aperiodic CSI related to the first base station sent by the user equipment; An information forwarding unit, configured to forward the aperiodic CSI to the first base station. 25. A communication system comprising the user equipment of claim 20. 26. A communication system comprising the user equipment of claim 21. 27. A communication system comprising the user equipment according to claim 22 and the base station according to claim 23 or 24. 28. A storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the method for sending uplink control information according to any one of claims 1 to 15 in a user equipment. 29. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the method for sending uplink control information according to any one of claims 16 to 19 in a base station.