Methods and apparatus for communication an uplink signaling in a target subframe

Abstract

The present invention discloses a method and a system for transmitting an uplink signal between a plurality of carriers, user equipment, and a base station, so that channel reciprocity can be effectively utilized. The method in embodiments of the present invention includes: receiving indication signaling sent by a base station; and transmitting an uplink signal in a target subframe of a corresponding target carrier based on the indication signaling.

Claims

1. A method, comprising: receiving, by user equipment (UE), radio resource control (RRC) signaling, wherein the RRC signaling comprises indication signaling, wherein the indication signaling comprises carrier indication information and the carrier indication information comprises a converted-from carrier index indicating a converted-from carrier and a converted-to carrier index indicating a converted-to carrier; and transmitting, by the UE, a sounding reference signal (SRS) in an uplink symbol of a target subframe of a target carrier based on the indication signaling, wherein the target carrier is the converted-to carrier, the target subframe is a converted-to subframe that is converted from a downlink subframe comprising a downlink symbol, and the uplink symbol is converted from the downlink symbol of the downlink subframe.

2. The method according to claim 1, wherein the method further comprises: receiving, by the UE, physical layer signaling, wherein the physical layer signaling indicates a carrier conversion, a subframe conversion, or both.

3. The method according to claim 1, wherein the indication signaling further comprises at least one of a bandwidth occupied by an uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, or a power control parameter.

4. The method according to claim 1, wherein the method further comprises: configuring, by the UE, a time-domain location and an occupied symbol length of an uplink signal.

5. The method according to claim 1, wherein the indication signaling is semi-statically configured by the RRC signaling.

6. The method according to claim 1, wherein the indication signaling further comprises carrier set information, the indication signaling further indicates a subframe mode, or the indication signaling further comprises carrier set information and further indicates a subframe mode.

7. The method according to claim 1, wherein the target subframe further transmits downlink control information, downlink data information, or both.

8. A method for transmitting an uplink signal between a plurality of carriers, comprising: sending, by a base station, radio resource control (RRC) signaling to user equipment, wherein the RRC signaling comprises indication signaling, wherein the indication signaling indicates a target carrier of which the user equipment transmits a sounding reference signal (SRS) in a target subframe, wherein the indication signaling comprises carrier indication information and the carrier indication information comprises a converted-from carrier index indicating a converted-from carrier and a converted-to carrier index indicating a converted-to carrier, wherein the target carrier is the converted-to carrier; and receiving, by the base station, the SRS in an uplink symbol of the target subframe in the target carrier, wherein the target subframe is a converted-to subframe that is converted from a downlink subframe comprising a downlink symbol, and the uplink symbol is converted from the downlink symbol of the downlink subframe.

9. The method according to claim 8, wherein the method further comprises: sending, by the base station, physical layer signaling, wherein the physical layer signaling indicates a carrier conversion, a subframe conversion, or both.

10. The method according to claim 8, wherein the indication signaling further comprises at least one of a bandwidth occupied by the uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, or a power control parameter.

11. The method according to claim 8, wherein the indication signaling is semi-statically configured by the RRC signaling.

12. The method according to claim 8, wherein the indication signaling further comprises carrier set information, the indication signaling further indicates a subframe mode, or the indication signaling further comprises carrier set information and further indicates a subframe mode.

13. The method according to claim 8, wherein the target subframe further transmits downlink control information, downlink data information, or both.

14. User equipment (UE), comprising: at least one processor coupled to a non-transitory computer-readable storage medium storing programming instructions for execution by the at least one processor, the programming instructions cause the UE to perform steps comprising: receiving radio resource control (RRC) signaling, wherein the RRC signaling comprises indication signaling, wherein the indication signaling comprises carrier indication information and the carrier indication information comprises a converted-from carrier index indicating a converted-from carrier and a converted-to carrier index indicating a converted-to carrier; and transmitting a sounding reference signal (SRS) in an uplink symbol of a target subframe of a target carrier based on the indication signaling, wherein the target carrier is the converted-to carrier, wherein the target subframe is a converted-to subframe that is converted from a downlink subframe comprising a downlink symbol, and the uplink symbol is converted from the downlink symbol of the downlink subframe.

15. The UE according to claim 14, wherein the steps further comprise: receiving physical layer signaling, wherein the physical layer signaling indicates a carrier conversion, a subframe conversion, or both.

16. The UE according to claim 14, wherein the indication signaling further comprises at least one of a bandwidth occupied by an uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, or a power control parameter.

17. The UE according to claim 14, wherein the steps further comprise: configuring a time-domain location and an occupied symbol length of an uplink signal.

18. The UE according to claim 14, wherein the indication signaling is semi-statically configured by the RRC signaling.

19. The UE according to claim 14, wherein the indication signaling further comprises carrier set information, the indication signaling further indicates a subframe mode, or the indication signaling further comprises carrier set information and further indicates a subframe mode.

20. The UE according to claim 14, wherein the target subframe further transmits downlink control information, downlink data information, or both.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) To describe the technical solutions in the embodiments of the present invention more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

(2) FIG. 1 is a schematic diagram of a customized hybrid subframe and a reverse subframe according to an embodiment of the present invention;

(3) FIG. 2 is a schematic diagram of an embodiment of a method for transmitting an uplink signal between a plurality of carriers according to an embodiment of the present invention;

(4) FIG. 3 is a schematic diagram of a uniform mode according to an embodiment of the present invention;

(5) FIG. 4 is a schematic diagram of a non-uniform mode according to an embodiment of the present invention;

(6) FIG. 5 is a schematic diagram of another embodiment of a method for transmitting an uplink signal between a plurality of carriers according to an embodiment of the present invention;

(7) FIG. 6 is a schematic diagram of an embodiment of user equipment (UE) according to an embodiment of the present invention;

(8) FIG. 7 is a schematic diagram of an embodiment of a base station according to an embodiment of the present invention;

(9) FIG. 8 is a schematic diagram of an embodiment of a system according to an embodiment of the present invention; and

(10) FIG. 9 is a schematic diagram of an embodiment of a server according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

(11) The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some but not all of the embodiments of the present invention. All other embodiments obtained by persons skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

(12) In the specification, claims, and accompanying drawings of the present invention, the terms “first,” “second,” “third,” “fourth,” and so on (if existent) are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence. It should be understood that the data termed in such a way are interchangeable in proper circumstances so that the embodiments of the present invention described herein can be implemented in other orders than the order illustrated or described herein. In addition, the terms “include,” “contain” and any other variants mean to cover the non-exclusive inclusion, for example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those expressly listed steps or units, but may include other steps or units not expressly listed or inherent to such a process, method, system, product, or device.

(13) In the present invention, indication signaling is used for indication, so that a downlink subframe on a carrier has two new subframe definitions: 1. a hybrid subframe, and 2. a reverse subframe. The hybrid subframe means: 1. converting a last downlink symbol of the downlink subframe to an uplink symbol for uplink signal transmission, such as SRS transmission, uplink channel detection, channel state information (CSI) feedback, or hybrid automatic repeat request (HARQ) feedback, where in the hybrid subframe, a guard interval GP1 is used for downlink-to-uplink conversion, and a guard interval GP2 is used for uplink-to-downlink conversion; or 2. a location and a length of an uplink symbol are flexible, that is, are not limited to a last symbol, and a longer guard interval is used for downlink-to-uplink conversion. The reverse subframe means that an entire downlink subframe is converted to an uplink subframe. To facilitate understanding of definitions of the hybrid subframe and the reverse subframe, referring to FIG. 1, FIG. 1 is a schematic diagram of a customized hybrid subframe and a reverse subframe. Three hybrid subframes and one reverse subframe are used as an example for description. A guard interval GP1 in FIG. 1 is used for downlink-to-uplink conversion, and a length is configurable. A GP2 is used for uplink-to-downlink conversion, and a length is configurable, for example, may be 0. In a reverse subframe shown in FIG. 1, a first uplink (left side) transmission may be a physical uplink shared channel (PUSCH), and a second uplink (right side) transmission is an SRS.

(14) To facilitate understanding of the technical solutions of the present invention, the following describes the method for transmitting an uplink signal between a plurality of carriers in the present invention by using specific embodiments.

(15) Referring to FIG. 2, an embodiment of a method for transmitting an uplink signal between a plurality of carriers according to an embodiment of the present invention includes the following steps.

(16) 101. Receive indication signaling sent by a base station.

(17) In this embodiment, the indication signaling may be signaling that indicates carrier conversion and/or subframe conversion.

(18) Optionally, the indication signaling includes carrier indication information and/or subframe indication information.

(19) Optionally, the indication signaling further includes at least one of bandwidth occupied by the uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, and a power control parameter.

(20) Optionally, the carrier indication information includes a converted-from carrier index and/or a converted-to carrier index, and the subframe indication information includes a converted-from subframe number and/or a converted-to subframe number.

(21) 102. Transmit an uplink signal in a target subframe of a corresponding target carrier based on the indication signaling.

(22) Apparently, the target carrier and the target subframe of the target carrier are determined based on the indication signaling, and the uplink signal is transmitted in the target subframe of the target carrier.

(23) It should be noted that if the carrier indication information includes the converted-from carrier index and/or the converted-to carrier index, and the subframe indication information includes the converted-from subframe number and/or the converted-to subframe number, the target carrier is a converted-to carrier, and the target subframe is a converted-to subframe.

(24) It may be understood that, in addition to transmitting the uplink signal, the target subframe of the target carrier may further transmit the following information:

(25) Optionally, the target subframe further transmits downlink control information and downlink data information, or the target subframe further transmits uplink control information and uplink data information.

(26) Specifically, the method further includes: transmitting, in the target subframe of the corresponding target carrier based on the indication signaling, at least one of the downlink control information, the downlink data information, the uplink control information, and the uplink data information.

(27) Optionally, if the uplink signal includes the uplink control information, step 102 is specifically: Transmit, in the target subframe of the corresponding target carrier based on the indication signaling, the downlink control information and/or the downlink data information and/or the uplink control information.

(28) Optionally, there are successively the downlink control information, the downlink data information, a guard interval, and the uplink signal; or there are successively the downlink control information, the downlink data information, the guard interval, and the uplink control information; or there are successively the downlink control information, the downlink data information, the guard interval, the uplink control information, and the uplink signal.

(29) Optionally, there are successively the uplink control information, the uplink data information, the guard interval, and the uplink signal; or there are successively the uplink control information, the uplink data information, the guard interval, the uplink signal, and the uplink data information.

(30) In short, transmitting the uplink signal in the target subframe may be: 1. The uplink signal does not include the uplink control information, and the uplink signal and other information are transmitted in the target subframe; 2. The uplink signal includes the uplink control information, and the uplink control information and other information are transmitted in the target subframe. Apparently, there are two special cases: 1. Only the uplink signal is transmitted in the target subframe; 2. Only the uplink control information is transmitted in the target subframe.

(31) It should be noted that if the target subframe is used for only uplink transmission, it indicates that the target subframe at this time may be equivalent to the foregoing reverse subframe. If the target subframe is used for both uplink transmission and downlink transmission, it indicates that the target subframe at this time is equivalent to the foregoing hybrid subframe.

(32) Further, if the target subframe further transmits the uplink control information, this embodiment of the present invention may further include:

(33) configuring a time-domain location or a frequency-domain location and/or an occupied symbol length of the uplink signal and/or the uplink control information.

(34) It should be noted that the target subframe includes downlink transmission and uplink transmission, there is a guard interval GP between the downlink transmission and the uplink transmission, and a length of the guard interval is configurable.

(35) Optionally, the uplink signal is used for uplink channel detection, and the uplink control information is used for at least one of uplink channel detection, channel state information (CSI) feedback, and hybrid automatic repeat request (HARQ) feedback.

(36) Optionally, the uplink signal includes at least one of a sounding reference signal (SRS), a preamble, and a Code Division Multiple Access (CDMA) signal.

(37) Optionally, the SRS is a combination of a plurality of preconfigured SRS sequences, and a transmission mode of the SRS is a combination of a plurality of preconfigured SRS modes, to ensure that a full bandwidth detection capability exceeds a detection threshold.

(38) Optionally, the indication signaling is notified by using self-carrier signaling or cross-carrier signaling.

(39) It may be understood that configuration may be notified by using the cross-carrier signaling, that is, converted-to subframes of all carriers are notified on a primary carrier or a secondary carrier. That is, when a plurality of carriers have a common converted-to subframe mode, only one common converted-to subframe mode needs to be notified by using signaling and a related carrier set is carried simultaneously. Alternatively, a specific mode used when jumping is performed between the plurality of carriers may be met or a specific jump sequence may be complied with.

(40) Optionally, the indication signaling is dynamically configured or semi-statically configured.

(41) Optionally, that the indication signaling is dynamically configured or semi-statically configured is specifically: dynamically configuring or semi-statically configuring the indication signaling by using at least one of broadcast signaling, higher layer radio resource control (RRC) signaling, and physical layer signaling.

(42) Optionally, the semi-static configuration includes that a carrier mode and/or a subframe mode are/is semi-statically configured.

(43) Optionally, the carrier mode and/or the subframe mode comply/complies with a preconfigured sequence design when jumping between carriers and/or subframes.

(44) Optionally, the semi-static configuration has an applicable period that is configurable.

(45) Optionally, the semi-static configuration is dynamically activated or deactivated.

(46) Optionally, the carrier mode and/or the subframe mode are/is periodic modes/a periodic mode or aperiodic modes/an aperiodic mode, and a carrier and/or a subframe in the carrier mode and/or the subframe mode are/is in a uniform mode or a non-uniform mode.

(47) Refer to FIG. 3 for a specific accompanying drawing of the uniform mode, refer to FIG. 4 for a specific accompanying drawing of the non-uniform mode, and a subframe in FIG. 3 and FIG. 4 is represented by using a switched-to subframe.

(48) Optionally, if the subframe mode is the periodic mode, the subframe in the subframe mode has a same period or different periods on different carriers.

(49) Optionally, the carrier mode and/or the subframe mode are/is determined by interface signaling between base stations, and the carrier mode and/or the subframe mode are/is transferred between the base stations.

(50) It should be noted that the carrier mode and/or the subframe mode need/needs to be aligned between the base stations, to cope with interference from the base station. An interface between the base stations may be an X2 interface.

(51) In this embodiment, the uplink signal is transmitted in the target subframe of the target carrier based on the obtained indication signaling. Apparently, when the target carrier performs downlink transmission, for a larger quantity of carriers in downlink transmission, the indication signaling is used to enable a downlink subframe or an uplink subframe of the carrier to transmit the uplink signal. Apparently, in the present invention, channel reciprocity is effectively utilized.

(52) The foregoing has described the method for transmitting an uplink signal between a plurality of carriers in the present invention from a user equipment side. The following describes the method for transmitting an uplink signal between a plurality of carriers in the present invention from a base station side.

(53) Referring to FIG. 5, another embodiment of a method for transmitting an uplink signal between a plurality of carriers according to an embodiment of the present invention includes the following steps.

(54) 201. Configure indication signaling.

(55) In this embodiment, optionally, the indication signaling is signaling that indicates carrier conversion and/or subframe conversion.

(56) Optionally, the indication signaling includes carrier indication information and/or subframe indication information.

(57) Optionally, the indication signaling further includes at least one of bandwidth occupied by the uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, and a power control parameter.

(58) Optionally, the carrier indication information includes a converted-from carrier index and/or a converted-to carrier index, and the subframe indication information includes a converted-from subframe number and/or a converted-to subframe number.

(59) Optionally, configuring the indication signaling includes:

(60) dynamically configuring or semi-statically configuring the indication signaling.

(61) Specifically, the indication signaling is dynamically configured or semi-statically configured by using at least one of broadcast signaling, higher layer radio resource control (RRC) signaling, and physical layer signaling.

(62) Optionally, if the indication signaling is semi-statically configured, the semi-static configuration includes that a carrier mode and/or a subframe mode are/is semi-statically configured.

(63) Optionally, the carrier mode and/or the subframe mode comply/complies with a preconfigured sequence design when jumping between carriers and/or subframes.

(64) Optionally, the semi-static configuration has an applicable period that is configurable, and the semi-static configuration is dynamically activated or deactivated.

(65) Optionally, the carrier mode and/or the subframe mode are/is periodic modes/a periodic mode or aperiodic modes/an aperiodic mode, and a carrier and/or a subframe in the carrier mode and/or the subframe mode are/is in a uniform mode or a non-uniform mode.

(66) Optionally, if the subframe mode is the periodic mode, the subframe in the subframe mode has a same period or different periods on different carriers.

(67) 202. Send the indication signaling to user equipment, so that the user equipment transmits an uplink signal in a target subframe of a corresponding target carrier based on the indication signaling.

(68) In this embodiment, optionally, sending the indication signaling to the user equipment includes:

(69) sending the indication signaling by using self-carrier signaling or cross-carrier signaling.

(70) In this embodiment, the uplink signal is transmitted in the target subframe of the target carrier based on the obtained indication signaling. Apparently, when the target carrier performs downlink transmission, for a larger quantity of carriers in downlink transmission, the indication signaling is used to enable a downlink subframe or an uplink subframe of the carrier to transmit the uplink signal. Apparently, in the present invention, channel reciprocity is effectively utilized.

(71) Referring to FIG. 6, an embodiment of user equipment (UE) according to an embodiment of the present invention includes:

(72) a receiving module 301, configured to receive indication signaling sent by a base station; and

(73) a transmission module 302, configured to transmit an uplink signal in a target subframe of a corresponding target carrier based on the indication signaling.

(74) Optionally, the indication information is signaling that indicates carrier conversion and/or subframe conversion.

(75) Optionally, the indication signaling further includes at least one of bandwidth occupied by the uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, and a power control parameter. The indication signaling is scrambled by using a specific cyclic redundancy code (CRC).

(76) Optionally, carrier indication information includes a converted-from carrier index and/or a converted-to carrier index, and subframe indication information includes a converted-from subframe number and/or a converted-to subframe number.

(77) Apparently, the target carrier and the target subframe of the target carrier are determined based on the indication signaling, and the uplink signal is transmitted in the target subframe of the target carrier.

(78) It should be noted that if the carrier indication information includes the converted-from carrier index and/or the converted-to carrier index, and the subframe indication information includes the converted-from subframe number and/or the converted-to subframe number, the target carrier is a converted-to carrier, and the target subframe is a converted-to subframe.

(79) It may be understood that, in addition to transmitting the uplink signal, the target subframe of the target carrier may further transmit the following information:

(80) Optionally, the target subframe further transmits downlink control information and downlink data information, or the target subframe further transmits uplink control information and uplink data information.

(81) Specifically, the transmission module 302 is further configured to transmit, in the target subframe of the corresponding target carrier based on the indication signaling, at least one of the downlink control information, the downlink data information, the uplink control information, and the uplink data information.

(82) Optionally, if the uplink signal includes the uplink control information, the transmission module 302 is specifically configured to transmit, in the target subframe of the corresponding target carrier based on the indication signaling, the downlink control information and/or the downlink data information and/or the uplink control information.

(83) In short, transmitting the uplink signal in the target subframe may be: 1. The uplink signal does not include the uplink control information, and the uplink signal and other information are transmitted in the target subframe; 2. The uplink signal includes the uplink control information, and the uplink control information and other information are transmitted in the target subframe. Apparently, there are two special cases: 1. Only the uplink signal is transmitted in the target subframe; 2. Only the uplink control information is transmitted in the target subframe.

(84) It should be noted that if the target subframe is used for only uplink transmission, it indicates that the target subframe at this time may be equivalent to the foregoing reverse subframe. If the target subframe is used for both uplink transmission and downlink transmission, it indicates that the target subframe at this time is equivalent to the foregoing hybrid subframe.

(85) Further, if the target subframe further transmits the uplink control information,

(86) This embodiment may further include:

(87) a configuration module, configured to configure a time-domain location or a frequency-domain location and/or an occupied symbol length of the uplink signal and/or the uplink control information.

(88) It should be noted that the target subframe includes downlink transmission and uplink transmission, there is a guard interval GP between the downlink transmission and the uplink transmission, and a length of the guard interval is configurable.

(89) Optionally, the uplink signal is used for uplink channel detection, and the uplink control information is used for at least one of uplink channel detection, channel state information (CSI) feedback, and hybrid automatic repeat request (HARQ) feedback.

(90) Optionally, the uplink signal includes at least one of a sounding reference signal (SRS), a preamble, and a Code Division Multiple Access (CDMA) signal.

(91) Optionally, the SRS is a combination of a plurality of preconfigured SRS sequences, and a transmission mode of the SRS is a combination of a plurality of preconfigured SRS modes, to ensure that a full bandwidth detection capability exceeds a detection threshold.

(92) Optionally, the indication signaling is notified by using self-carrier signaling or cross-carrier signaling.

(93) It may be understood that configuration may be notified by using the cross-carrier signaling, that is, converted-to subframes of all carriers are notified on a primary carrier or a secondary carrier. That is, when a plurality of carriers have a common converted-to subframe mode, only one common converted-to subframe mode needs to be notified by using signaling and a related carrier set is carried simultaneously. Alternatively, a specific mode used when jumping is performed between the plurality of carriers may be met or a specific jump sequence may be complied with.

(94) Optionally, the indication signaling is dynamically configured or semi-statically configured.

(95) Optionally, that the indication signaling is dynamically configured or semi-statically configured is specifically: dynamically configuring or semi-statically configuring the indication signaling by using at least one of broadcast signaling, higher layer radio resource control (RRC) signaling, and physical layer signaling.

(96) Optionally, the semi-static configuration includes that a carrier mode and/or a subframe mode are/is semi-statically configured.

(97) Optionally, the carrier mode and/or the subframe mode comply/complies with a preconfigured sequence design when jumping between carriers and/or subframes.

(98) Optionally, the semi-static configuration has an applicable period that is configurable.

(99) Optionally, the semi-static configuration is dynamically activated or deactivated.

(100) Optionally, the carrier mode and/or the subframe mode are/is periodic modes/a periodic mode or aperiodic modes/an aperiodic mode, and a carrier and/or a subframe in the carrier mode and/or the subframe mode are/is in a uniform mode or a non-uniform mode.

(101) Optionally, if the subframe mode is the periodic mode, the subframe in the subframe mode has a same period or different periods on different carriers.

(102) Optionally, the carrier mode and/or the subframe mode are/is determined by interface signaling between base stations, and the carrier mode and/or the subframe mode are/is transferred between the base stations.

(103) It should be noted that the carrier mode and/or the subframe mode need/needs to be aligned between the base stations, to cope with interference from the base station. An interface between the base stations may be an X2 interface.

(104) In this embodiment, the uplink signal is transmitted in the target subframe of the target carrier based on the received indication signaling. Apparently, when the target carrier performs downlink transmission, for a larger quantity of carriers in downlink transmission, the indication signaling is used to enable a downlink subframe or an uplink subframe of the carrier to transmit the uplink signal. Apparently, in the present invention, channel reciprocity is effectively utilized.

(105) Referring to FIG. 7, an embodiment of a base station according to an embodiment of the present invention includes:

(106) a configuration module 401, configured to configure indication signaling; and

(107) a sending module 402, configured to send the indication signaling to user equipment, so that the user equipment transmits an uplink signal in a target subframe of a corresponding target carrier based on the indication signaling.

(108) Optionally, the indication signaling is signaling that indicates carrier conversion and/or subframe conversion.

(109) Optionally, the indication signaling includes carrier indication information and/or subframe indication information.

(110) Optionally, the indication signaling further includes at least one of bandwidth occupied by the uplink signal, a transmission mode, a transmit port, a cyclic shift, timing advance, and a power control parameter.

(111) Optionally, the carrier indication information includes a converted-from carrier index and/or a converted-to carrier index, and the subframe indication information includes a converted-from subframe number and/or a converted-to subframe number.

(112) Optionally, the sending module 402 is specifically configured to send the indication signaling by using self-carrier signaling or cross-carrier signaling.

(113) Optionally, the configuration module 401 is specifically configured to dynamically configure or semi-statically configure the indication signaling.

(114) Optionally, the configuration module 401 is specifically configured to dynamically configure or semi-statically configure the indication signaling by using at least one of broadcast signaling, higher layer radio resource control (RRC) signaling, and physical layer signaling.

(115) Optionally, if the indication signaling is semi-statically configured, the semi-static configuration includes that a carrier mode and/or a subframe mode are/is semi-statically configured.

(116) Optionally, the carrier mode and/or the subframe mode comply/complies with a preconfigured sequence design when jumping between carriers and/or subframes.

(117) Optionally, the semi-static configuration has an applicable period that is configurable, and the semi-static configuration is dynamically activated or deactivated.

(118) Optionally, the carrier mode and/or the subframe mode are/is periodic modes/a periodic mode or aperiodic modes/an aperiodic mode, and a carrier and/or a subframe in the carrier mode and/or the subframe mode are/is in a uniform mode or a non-uniform mode.

(119) Optionally, if the subframe mode is the periodic mode, the subframe in the subframe mode has a same period or different periods on different carriers.

(120) In this embodiment, the uplink signal is transmitted in the target subframe of the target carrier based on the received indication signaling. Apparently, when the target carrier performs downlink transmission, for a larger quantity of carriers in downlink transmission, the indication signaling is used to enable a downlink subframe or an uplink subframe of the carrier to transmit the uplink signal. Apparently, in the present invention, channel reciprocity is effectively utilized.

(121) An embodiment of the present invention further provides a system for transmitting an uplink signal between a plurality of carriers. Referring to FIG. 8, an embodiment of the system according to this embodiment of the present invention includes:

(122) a base station 501 and user equipment 502.

(123) The base station 501 is configured to: configure indication signaling, and send the indication signaling to the user equipment.

(124) The user equipment 502 is configured to: receive the indication signaling sent by the base station, and transmit an uplink signal in a target subframe of a corresponding target carrier based on the indication signaling.

(125) In this embodiment, the uplink signal is transmitted in the target subframe of the target carrier based on the received indication signaling. Apparently, when the target carrier performs downlink transmission, for a larger quantity of carriers in downlink transmission, the indication signaling is used to enable a downlink subframe or an uplink subframe of the carrier to transmit the uplink signal. Apparently, in the present invention, channel reciprocity is effectively utilized.

(126) An embodiment of the present invention further provides a server. Referring to FIG. 9, an embodiment of the server according to this embodiment of the present invention includes the following content.

(127) FIG. 9 is a schematic structural diagram of the server according to this embodiment of the present invention. The server 600 may differ greatly because of different configurations or performance, and may include one or more central processing units (CPU) 601 (for example, one or more processors), and one or more storage media 604 (for example, one or more mass storage devices) that store an application program 602 or data 603. The storage medium 604 may be a transient storage or a persistent storage. A program stored in the storage medium 604 may include one or more modules (not shown in the figure), and each module may include a series of instruction operations to be performed on a switch. Further, the central processing unit 601 may be configured to communicate with the storage medium 604 to perform, on the server 600, a series of instruction operations in the storage medium 604.

(128) The server 600 may further include one or more power supplies 605, one or more wired or wireless network interfaces 606, one or more input/output interfaces 607, and/or one or more operating systems 608, such as Windows Server™, Mac OS X™, Unix™, Linux™, or FreeBSD™.

(129) In the foregoing embodiments, the steps performed by the UE, the base station, and the system may be based on the server structure shown in FIG. 9.

(130) It may be clearly understood by persons skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and unit, reference may be made to a corresponding process in the foregoing method embodiments, and details are not described herein.

(131) In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described apparatus embodiment is merely an example. For example, the unit division is merely logical function division and may be other division in actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.

(132) 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, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

(133) In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in a form of hardware, or may be implemented in a form of a software functional unit.

(134) When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the present invention essentially, or the part contributing to the prior art, or all or some of the technical solutions may be implemented in the form of a software product. The software product is stored in a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or some of the steps of the methods described in the embodiments of the present invention. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc.

(135) The foregoing embodiments are merely intended for describing the technical solutions of the present invention, but not for limiting the present invention. Although the present invention is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.