WO2017015787A1 - Method and device for pdcch monitoring, and communication system - Google Patents

Abstract

Disclosed are a method and device for PDCCH monitoring, and a communication system. The method comprises: determining a union set of downlink subframes of serving cells other than secondary serving cells on an unlicensed frequency band and/or a serving cell configured for cross-carrier scheduling, or determining said union set of downlink subframes and subframes including downlink pilot time slots in a TDD system as a PDCCH subframe of user equipment; and determining whether each subframe of the secondary serving cells on the unlicensed frequency band is a subframe used for PDCCH monitoring. Therefore, even in systems configured with the unlicensed frequency band, the PDCCH subframe of the user equipment can be determined accurately; and subframes for PDCCH monitoring on the unlicensed frequency band can be determined.

Description

Method, device and communication system for performing PDCCH monitoring Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a communication system for performing physical downlink control channel (PDCCH) monitoring.

Background technique

In order to meet the bandwidth demand of future services, it has become a hot issue to use an unlicensed band (which may be called LAA, or License Assisted Access) for communication in a Long Term Evolution (LTE) system. The serving cell on the unlicensed frequency band can be configured as an independent serving cell to the user equipment (UE, User Equipment) for communication by the user equipment, or can be used on the unlicensed frequency band by using the serving cell aggregation method or the dual connection method in the LTE system. The serving cell is configured as a secondary cell (Scell, Secondary Cell) to the user equipment, and the primary cell (Pcell, Primary Cell) is a serving cell on the licensed frequency band.

The working mode of the primary serving cell may be a Frequency Division Duplex (FDD) mode or a Time Division Duplex (TDD) mode; the secondary serving cell on the unlicensed frequency band may also select an FDD mode. Or one of the TDD modes, and it may be that only the downlink or the uplink and downlink are present at the same time.

Since the system currently uses the serving cell on the unlicensed band to communicate, for example, a Wireless Local Area Network (WLAN) system. Therefore, the addition of the LTE system must ensure that the unlicensed frequency band can be utilized fairly between the LTE system and other systems and systems of different LTE operators.

To achieve this, LBT (listen-before-talk) is a major direction. The specific implementation of LBT can be various. The basic idea of LBT is that the sender must first listen for a period of time before the channel on the unlicensed band is used to transmit the signal. The transmitting end can transmit a signal on the channel only if the channel is always idle during the listening period. If the channel is found to be busy during the listening period, the sender needs to automatically back off for a period of time before listening to whether the channel is available.

It should be noted that the above description of the technical background is only for the purpose of facilitating a clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these aspects are set forth in the background section of the present invention.

Summary of the invention

The base station may configure a cell on the unlicensed band as a secondary serving cell for a certain user equipment, and the sub-serving cell of this type is hereinafter referred to as a LAA Scell. Due to the existence of the LBT mechanism, the base station cannot guarantee that the channel can be preempted in a certain subframe of the secondary serving cell, so that the base station cannot use the high-level signaling, such as radio resource control (RRC) signaling, as the user equipment. Pre-configure an accurate frame structure of the secondary serving cell.

For example, the base station may configure the frame structure of the secondary serving cell to be DDDDDUUUUU for the user equipment by using RRC signaling. However, due to the existence of LBT, the actual situation in a certain frame may become XXXXXXXUUU. Where X indicates that the base station does not preempt the channel corresponding to the secondary serving cell in the subframe. Alternatively, the base station configures the frame structure as XXXXXXXDDD based on the uplink and downlink traffic conditions.

FIG. 1 is a diagram showing an example of dynamic determination of a frame structure of a LAA Scell in a case where a Pcell of a user equipment is configured as TDD configuration 0. As shown in FIG. 1 , the subframe of the Pcell includes a downlink subframe (D), an uplink subframe (U), and a special subframe (S); the LAA Scell has a subframe that is not occupied by the base station due to the LBT mechanism, and thus cannot be configured. Precise frame structure.

In this way, the user equipment cannot determine the frame structure of the serving cell when determining the PDCCH-subframe to count some timers in the current DRX (Discontinuous Reception) mechanism. Exactly determining which subframes can be used as the PDCCH-subframe; on the other hand, the user equipment cannot know which subframes on the serving cell are the downlink subframes that need to be monitored, that is, the base station preempts the channel and is configured as a downlink sub-frame. The subframe of the frame.

Embodiments of the present invention provide a method, an apparatus, and a communication system for performing PDCCH monitoring. Even in a system in which an unlicensed band is configured, the PDCCH subframe of the user equipment can be accurately determined, and it can be determined which subframes in the secondary serving cell of the unlicensed band are subframes for PDCCH snooping.

According to a first aspect of the embodiments of the present invention, a method for performing PDCCH monitoring includes:

And a downlink subframe of a secondary serving cell of the user equipment except the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe and the TDD system include a downlink guide The union of the subframes of the DwPTS (Downlink Pilot Time Slot) is determined as the PDCCH subframe of the user equipment;

For each subframe of the secondary serving cell of the unlicensed band,

In a case where the user equipment is not required by the base station to perform uplink transmission on the subframe during an active time of the user equipment, determining the subframe as a subframe for performing PDCCH monitoring; or During the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but if the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to be a PDCCH. a subframe to be monitored; or, in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, determining the subframe as a subframe for performing PDCCH monitoring;

During the activation period of the user equipment, the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.

According to a second aspect of the embodiments of the present invention, an apparatus for performing PDCCH monitoring includes:

a first subframe determining unit, or a downlink subframe of a secondary serving cell of the user equipment except the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe And determining, by the concatenation of the subframes that include the DwPTS in the TDD system, the PDCCH subframe of the user equipment;

a second subframe determining unit, for each subframe of the secondary serving cell of the unlicensed band,

During the activation period of the user equipment, if the user equipment is not required by the base station to perform uplink transmission on the subframe, the subframe is determined as a subframe for performing PDCCH monitoring; or, during activation of the user equipment During the period, if the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to perform PDCCH monitoring. a sub-frame; or, during the activation period of the user equipment, if the user equipment knows that the subframe is a downlink subframe, determining the subframe as a subframe for performing PDCCH snooping;

a monitoring unit, during the activation period of the user equipment, the subframe that is determined by the first subframe determining unit and the subframe determined by the second subframe determining unit to perform PDCCH monitoring, Perform PDCCH monitoring.

According to a third aspect of the embodiments of the present invention, a method for performing PDCCH monitoring includes:

Sending indication information to the user equipment, so that the user equipment learns that a certain subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe; and/or,

Sending, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.

According to a fourth aspect of the embodiments of the present invention, an apparatus for performing PDCCH monitoring includes:

The first sending unit sends the indication information to the user equipment, so that the user equipment learns the unlicensed frequency band. A subframe of the secondary serving cell is a downlink subframe; and/or,

The second sending unit sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.

According to a fifth aspect of the embodiments of the present invention, a communication system is provided, the communication system comprising:

a user equipment, a downlink subframe of a secondary serving cell other than an unlicensed frequency band and/or a serving cell configured to be a cross-carrier scheduled serving cell, or a DwPTS included in the downlink subframe and the TDD system The union of the subframes is determined as a PDCCH subframe of the user equipment;

For each subframe of the secondary serving cell of the unlicensed band,

In the case that the user equipment is not required to perform uplink transmission on the subframe during the activation period, or during the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but In a case where the subframe is aligned or overlapped with the PDCCH subframe, or in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, the user equipment uses the subframe a subframe determined to perform PDCCH snooping;

During the activation period of the user equipment, the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring;

The base station sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe; and/or, And sending the indication information to the user equipment, so that the user equipment learns that the subframe is a downlink subframe.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a user equipment, the program causes a computer to perform PDCCH monitoring as described above in the user equipment method.

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a method of performing PDCCH monitoring as described above in a user equipment.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a base station, the program causes a computer to perform a method of performing PDCCH monitoring as described above in the base station.

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a PDCCH monitoring as described above in a base station law.

An advantageous effect of the embodiment of the present invention is that, even in a system configured with an unlicensed frequency band, the PDCCH subframe of the user equipment can be accurately determined, and which subframes in the secondary serving cell of the unlicensed frequency band can be determined to perform PDCCH. The sub-frame that is being monitored.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the drawings, in which <RTIgt; It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the appended claims.

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

It should be emphasized that the term "comprising" or "comprises" or "comprising" or "comprising" or "comprising" or "comprising" or "comprises"

DRAWINGS

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

Elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the

1 is a diagram showing an example of dynamic determination of a frame structure of a LAA Scell in a case where a Pcell of a user equipment is configured as TDD configuration 0;

2 is a schematic diagram of a method for performing PDCCH monitoring according to Embodiment 1 of the present invention;

3 is a diagram showing an example of determining a PDCCH subframe according to Embodiment 1 of the present invention;

4 is a diagram showing an example of an uplink and downlink configuration in a transmission period according to Embodiment 1 of the present invention;

5 is another exemplary diagram of an uplink and downlink configuration in a transmission period according to Embodiment 1 of the present invention;

6 is another exemplary diagram of an uplink and downlink configuration in a transmission period according to Embodiment 1 of the present invention;

FIG. 7 is a schematic diagram of an apparatus for performing PDCCH monitoring according to Embodiment 2 of the present invention; FIG.

FIG. 8 is another schematic diagram of an apparatus for performing PDCCH monitoring according to Embodiment 2 of the present invention; FIG.

9 is a schematic diagram of a user equipment according to Embodiment 2 of the present invention;

FIG. 10 is a schematic diagram of a method for performing PDCCH monitoring according to Embodiment 3 of the present invention; FIG.

11 is a schematic diagram of an apparatus for performing PDCCH monitoring according to Embodiment 4 of the present invention;

FIG. 12 is a schematic diagram of a base station according to Embodiment 4 of the present invention; FIG.

Figure 13 is a diagram showing the communication system of Embodiment 5 of the present invention.

detailed description

The foregoing and other features of the present invention will be apparent from the The specific embodiments of the present invention are disclosed in the specification and the drawings, which are illustrated in the embodiment of the invention The invention includes all modifications, variations and equivalents falling within the scope of the appended claims.

Example 1

An embodiment of the present invention provides a method for performing PDCCH monitoring, which is applied to, for example, a primary serving cell configured with at least a licensed frequency band and a user equipment of a secondary serving cell of an unlicensed frequency band.

FIG. 2 is a schematic diagram of a method for performing PDCCH monitoring according to an embodiment of the present invention. As shown in FIG. 2, the method includes:

Step 201: The user equipment includes a downlink subframe of a secondary serving cell other than the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe and the TDD system include The union of the subframes of the DwPTS is determined as the PDCCH subframe of the user equipment;

Step 202: For each subframe of the secondary serving cell of the unlicensed frequency band, when the user equipment is not required to perform uplink transmission on the subframe during the activation period of the user equipment, or during the activation period The user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, or the user equipment is known during an activation period. When the subframe is a downlink subframe, the subframe is determined as a subframe for performing PDCCH monitoring;

Step 203: During the activation period of the user equipment, the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.

In this embodiment, when determining the PDCCH-subframe of the user equipment, the serving cell of the user equipment on the unlicensed carrier is not considered; that is, the PDCCH-subframe is defined as the unlicensed frequency band configured by the user equipment. The union of the serving cell and the downlink subframes of all other serving cells outside the serving cell configured in a cross-carrier scheduling manner (for example, under the FDD system), or the downlink subframes of the other all serving cells and the TDD The system contains the union of the subframes of the DwPTS (for example under the TDD system).

In this embodiment, the other serving cell may include: a primary serving cell on the licensed frequency band, and a secondary serving cell on zero or one or more licensed frequency bands; but the invention is not limited thereto.

In the present embodiment, the alignment or overlap between subframes is performed in the time domain, and the details will be clear to those skilled in the art. Further, it is also clear to those skilled in the art regarding the subframe including the DwPTS in the TDD system.

FIG. 3 is a diagram showing an example of determining a PDCCH subframe according to an embodiment of the present invention. As shown in FIG. 3, a user equipment is configured with a Pcell (configured as TDD configuration 0, its frame structure is DSUUUDSUUU), and Scell 1 (authorized frequency band). Scell, its frame structure is DSUUDDSUUD) and Scell 2 (LAA Scell). Then, the SPDCCH 2 is not considered when determining the PDCCH-frame, and thus the PDCCH-subframe is PPXXPPPXXP; wherein P indicates that it is a PDCCH-frame, and X indicates that it is not a PDCCH-frame.

In this embodiment, for a sub-serving cell (LAA Scell) of the unlicensed frequency band, whether a certain subframe is a subframe that needs to perform PDCCH monitoring may be determined as follows.

In an embodiment, the user equipment may be determined to be a sub-frame for PDCCH monitoring if the user equipment is not required by the base station to perform uplink transmission on the certain subframe during an active time. frame.

That is, for a certain subframe of the LAA SCell, the user equipment determines whether the subframe is an uplink subframe by receiving information sent by the base station for scheduling the user equipment to perform uplink data transmission on the subframe. During the active time, in addition to monitoring the PDCCH-subframe, for a subframe of the LAA SCell, if the user equipment is not required to perform uplink transmission on the subframe, the user equipment considers that this is a downlink subframe, and PDCCH snooping is performed on the subframe.

In another embodiment, the user equipment determines whether the base station has preempted the channel on the unlicensed carrier where the LAA SCell is located by receiving the indication signaling from the base station.

In addition, during the active time, if the user equipment does not know whether the certain subframe is an uplink subframe or a downlink subframe, but the certain subframe is aligned or overlapped with the PDCCH subframe, A certain subframe is determined as a subframe for performing PDCCH monitoring;

Or, in the case that the user equipment knows that the certain subframe is a downlink subframe during an active time, The certain subframe is determined as a subframe for performing PDCCH monitoring. The certain subframe may be aligned or overlapped with the PDCCH subframe, or the certain subframe may not be aligned or overlapped with the PDCCH subframe.

That is, in the present embodiment, during the active time, the user equipment monitors the PDCCH-subframe, and for a certain subframe of the LAA SCell, if the subframe belongs to a subframe defined by one of the following cases, the user equipment is in the sub-frame. PDCCH snooping is performed on the frame.

C1: the subframe of the LAA Scell is aligned or overlapped with the PDCCH-subframe, but the UE does not know whether the subframe is an uplink subframe or a downlink subframe.

C2: the subframe of the LAA Scell is aligned or overlapped with the PDCCH-subframe, and the UE has learned that the subframe is a downlink subframe by using indication signaling (such as Signaling A or Signaling B described below);

C3: The subframe of the LAA Scell is not aligned or overlapped with the PDCCH-subframe, but the UE has known that the subframe is a downlink subframe by indicating signaling (for example, Signaling A or Signaling B described below).

In this embodiment, the indication information sent by the base station may include uplink and downlink configuration information of each subframe in the transmission period, or uplink and downlink configuration information of each subframe in the remaining subframes of the transmission period; where the transmission period is The maximum length of time that the base station can occupy after preempting the channel corresponding to the secondary serving cell of the unlicensed frequency band.

The maximum length of time that the base station can occupy the channel on the unlicensed carrier where the LAA Scell is located is called a transmission period, and the length of the transmission period is represented by N subframes (the value of N can be passed by the base station, for example. RRC signaling is configured to the UE). In addition, the UE may further determine, by using the indication signaling, an uplink and downlink configuration of each subframe in the transmission period, or each sub-frame remaining in the transmission period after receiving the downlink subframe of the indication signaling. The uplink and downlink configuration of the frame.

FIG. 4 is a schematic diagram of an uplink and downlink configuration in a transmission period according to an embodiment of the present invention. As shown in FIG. 4, a transmission period may include 10 subframes, where a frame structure configured by a base station for a LAA Scell is DDDDDDUUUU; UE1 may be When the base station occupies the channel, the active time is obtained, so that the uplink and downlink configuration of each subframe in the transmission period is obtained. The UE2 may not be in the active time when the base station occupies the channel, and is in the active time after two frames. Therefore, the uplink and downlink configuration of the remaining subframes in the transmission period is obtained.

In one case, the indication information sent by the base station is included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band. At this time, the indication information can be referred to as Signalling A.

For example, after detecting that the channel corresponding to the unlicensed carrier where the LAA SCell is located is available to the UE, in some cases, it may be necessary to immediately send a reservation signal to occupy the channel. Then, after the base station can simultaneously preempt the channel, the UL/DL configuration information in the next transmission period is included in the reserved signal and sent to the UE.

In this case, the method further includes determining when the indication information needs to be received.

Specifically, the user equipment does not know whether the certain subframe is an uplink subframe or a downlink subframe during the active time, but if the certain subframe is aligned or overlapped with the PDCCH subframe, the user The device decodes the reserved signal to obtain uplink and downlink configuration information.

For example, during an active time, for a certain subframe of the LAA Scell that satisfies the above C1 condition, the UE will decode the reserved signal including Signaling A on the subframe.

In another case, the indication information sent by the base station is included in downlink control information (DCI, Downlink Control Information) sent by the PDCCH. At this time, the indication information can be referred to as Signalling B.

For example, after a certain UE enters the active time, for a certain LAA SCell of the UE, if the base station finds that it has preempted the channel corresponding to the unlicensed carrier where the LAA SCell is located, it has started a new one on the LAA SCell. Transmission period, but the base station has not sent the UL/DL configuration of the LAA SCell in the current transmission period to the UE, or the base station has previously transmitted the UL/DL configuration of the LAA Scell in the current transmission period, but due to the UE When the indication signaling is not received in the DRX state, the base station may choose to send Signaling B to the UE.

The detailed design of the Signaling B can be as follows.

In an embodiment, the downlink control information is carried by user equipment-specific (UE-specific) signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or a scheduling serving cell that is scheduled by cross-carrier scheduling Send on.

In this embodiment, the CRC (Cyclic Redundancy Check) of the PDCCH may be scrambled by the Cell Radio Network Temporary Identifier (C-RNTI) of the UE, or may be a newly defined The RNTI (eg, referred to as LAA-RNTI) is used to scramble the CRC of the PDCCH.

Specifically, the downlink control information may include at least: a cell index of the secondary serving cell of the unlicensed band, a number of remaining subframes in the transmission period, and a number of downlink subframes of the remaining subframe.

For example, DCI can include:

当前的传输周期中剩余的所有子帧的数目：N’(N’<＝N)；

The number of all subframes remaining in the current transmission period: N'(N'<=N);

当前的传输周期中剩余N’个子帧中的下行子帧的数目：N_DL。

The number of downlink subframes in the remaining N' subframes in the current transmission period: N _DL .

In addition, DCI can also include:

LAA SCell的小区索引。该小区可以是基站在为UE配置所述LAA SCell时配

Cell index of LAA SCell. The cell may be configured by the base station when configuring the LAA SCell for the UE.

Set to the UE (only if the LAA SCell is configured for cross-carrier scheduling).

Taking the case shown in FIG. 4 as an example, for example, the cell index configuration of a certain LAA SCell of UE1 and UE2 is 1, and the cross-carrier scheduling is configured for the LAA SCell; the N configuration is 10. UE1 and UE2 respectively listen to the PDCCH on the LAA Scell and receive the DCI at different times. In the case of the example shown in FIG. 4, the values of the parameters in the indication signaling DCI for UE1 and UE2 are:

UE1: (1, 10, 6); UE2: (1, 7, 3).

In the above example, it is assumed that the uplink or downlink is continuous and starts from the downlink. In addition, the DCI may further include indication information indicating whether to start from the uplink or the downlink, or indication information indicating whether the uplink or the downlink is continuous, and the like.

Alternatively, the downlink control information may further include: a cell index of the secondary serving cell of the unlicensed frequency band, a number of downlink subframes of the remaining subframes in the transmission period, and an uplink subframe number of the remaining subframes.

For example, DCI can include:

当前的传输周期中剩余子帧中的下行子帧的数目：N_DL；

The number of downlink subframes in the remaining subframes in the current transmission period: N _DL ;

当前的传输周期中剩余子帧中的上行子帧的数目：N_UL。

The number of uplink subframes in the remaining subframes in the current transmission period: N _UL .

In addition, DCI can also include:

LAA SCell的小区索引。该小区可以是基站在为UE配置所述LAA SCell时配

Cell index of LAA SCell. The cell may be configured by the base station when configuring the LAA SCell for the UE.

Set to the UE (only if the LAA SCell is configured for cross-carrier scheduling).

Taking the case shown in FIG. 4 as an example, for example, the cell index configuration of a certain LAA SCell of UE1 and UE2 is 1, and the cross-carrier scheduling is configured for the LAA SCell; the N configuration is 10. UE1 and UE2 respectively listen to the PDCCH on the LAA Scell and receive the DCI at different times. In the case of the example shown in FIG. 4, the values of the parameters in the indication signaling DCI for UE1 and UE2 are:

UE1: (1, 6, 4); UE2: (1, 3, 4).

In the above example, it is assumed that the uplink or downlink is continuous and starts from the downlink. In addition, the DCI may further include indication information indicating whether to start from the uplink or the downlink, or an indication indicating whether the uplink or the downlink is continuous. Information and more.

Alternatively, the downlink control information may further include: a cell index of the secondary serving cell in the unlicensed frequency band, a number of remaining subframes in the transmission period, and a bitmap indicating an uplink and downlink configuration in the transmission period.

For example, DCI can include:

当前的传输周期中剩余的所有子帧的数目：N’(N’<＝N)；

The number of all subframes remaining in the current transmission period: N'(N'<=N);

一个长度为N用来指示UL/DL配置的bitmap；其中，UE只会考虑N个bitmap中最右边N’个bitmap对应的子帧的UL/DL配置。

A bitmap of length N is used to indicate the UL/DL configuration; wherein the UE only considers the UL/DL configuration of the subframe corresponding to the rightmost N'th bitmap of the N bitmaps.

In addition, DCI can also include:

LAA SCell的小区索引。该小区可以是基站在为UE配置所述LAA SCell时配置给UE的(只有在该LAA SCell配置为跨载波调度的情况下才会有)。

Cell index of LAA SCell. The cell may be configured by the base station to the UE when the LAA SCell is configured for the UE (only if the LAA SCell is configured for cross-carrier scheduling).

Taking the case shown in FIG. 4 as an example, for example, the cell index configuration of a certain LAA SCell of UE1 and UE2 is 1, and the cross-carrier scheduling is configured for the LAA SCell; the N configuration is 10. UE1 and UE2 respectively listen to the PDCCH on the LAA Scell and receive the DCI at different times. In the case of the example shown in FIG. 4, the values of the parameters in the indication signaling DCI for UE1 and UE2 are:

UE1: (1, 10, 1111110000); UE2: (1, 7, 1111110000).

In this case, the method further includes determining when the indication information needs to be received.

Specifically, if the PDCCH is sent on the secondary serving cell of the unlicensed frequency band, the method further includes: during the active time, the user equipment does not know whether the certain subframe is an uplink subframe or a downlink subframe. In the case that the frame is aligned or overlapped with the PDCCH subframe, the user equipment decodes the downlink control information to obtain uplink and downlink configuration information.

For example, during the active time, when Signaling B adopts the UE-specific design method, and the LAA SCell adopts self-scheduling, the UE will decode on the subframe for a certain subframe of the LAA Scell satisfying the condition C1. Signaling B.

Or, if the PDCCH is sent on a scheduling serving cell that is scheduled by using a cross-carrier, the method further includes: if a PDCCH subframe of the scheduling serving cell, during the activation period, if the PDCCH subframe is A certain subframe of the secondary serving cell of the unlicensed frequency band is aligned or overlapped, and the user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe.

If the subframe of the scheduling serving cell before the certain PDCCH subframe is not a PDCCH subframe, or the subframe of the previous scheduling serving cell is a PDCCH subframe but not within an active time period, The user equipment decodes the downlink control information to obtain uplink and downlink configuration information.

For example, during the active time, when Signaling B adopts the UE-specific design method, and the LAA SCell configures the Cross-carrier scheduling, for a scheduling service cell overlapping with the subframe of the LAA Scell satisfying the condition C1, PDCCH-subframe, if the PDCCH-subframe satisfies any of the following conditions, the UE will decode Signaling B on the PDCCH-subframe of the scheduled serving cell;

D1: the subframe of the scheduling serving cell before the PDCCH-subframe is not a PDCCH-subframe;

D2: The subframe of the scheduling serving cell before the PDCCH-subframe is a PDCCH-subframe, but not in the active time.

In another embodiment, the downlink control information is carried by a cell common signaling; the PDCCH is sent on a primary serving cell of the licensed frequency band.

In this embodiment, the PDCCH carrying the DCI is cell common signaling. In this case, the PDCCH is transmitted on the PCell of the UE. For this case, the CRC of the PDCCH can be scrambled by a newly defined RNTI (eg, called LAA-RNTI).

The DCI may include M information elements (including, for example, UL/DL configuration 1, UL/DL configuration 2, . . . UL/DL configuration M). M may be a predefined value, or may be a parameter value configured through RRC signaling, or a value equal to the length of a current DCI.

Each of the information elements UL/DL configuration may be a multi-group (eg, a two-group). The number of each information element UL/DL configuration corresponds to the configuration of the UL/DL indicating the LAA SCell whose index value is the same as the number. The index value of the LAA SCell may be, for example, a cell index of the LAA SCell, or may be another index value configured to configure the LAA Scell. For example, if the cell index value of the LAA Scell is used and the cell index value of a certain LAA Scell is assumed to be 3, then the information element UL/DL configuration 3 is used to indicate the UL/DL configuration of the LAA SCell.

Specifically, each information element may include at least: a number of remaining subframes in a transmission period and a number of downlink subframes of the remaining subframes.

For example, each information element is (N', N _DL ): where N'(N'<= N) is the number of all subframes remaining in the current transmission period; N _DL is the remaining N' of the current transmission period The number of downlink subframes in the frame.

Or each information element may include at least: a number of downlink subframes of the remaining subframes in the transmission period. And the number of uplink subframes of the remaining subframes.

For example, each information element is (N _DL , N _UL ): where N _DL is the number of downlink subframes in the remaining subframes in the current transmission period; N _UL is the uplink subframe in the remaining subframes in the current transmission period. number.

Alternatively, each information element may include at least: a number of remaining subframes in the transmission period and a bitmap indicating an uplink and downlink configuration in the transmission period.

For example, each information element is (N'; Bitmap): where N'(N'<=N) is the number of all subframes remaining in the current transmission period; Bitmap is a length of N to indicate UL/DL configuration. Bitmap. The UE only considers the UL/DL configuration of the subframe corresponding to the rightmost N'th bitmap in the N bitmaps.

5 is another example diagram of an uplink and downlink configuration in a transmission period according to an embodiment of the present invention. As shown in FIG. 5, it is assumed that UE1 is configured with LAA SCell 1 and LAA Scell 2; UE 2 is configured with LAA Scell 2 and LAA Scell 3; UE3 is configured with LAA SCell 4. The value of M is 4; the value of N is 10. UE1 and UE2 have the same PCell. As shown in FIG. 5, UE1 and UE2 are both listening to the PDCCH of the PCell at a certain time, and receive the DCI transmitted on the PDCCH of the PCell.

The DCI can, for example, include the following information:

Example 1：{(9,5),(7,3),(7,5)(3,1)}

Example 1: {(9,5),(7,3),(7,5)(3,1)}

Example 2：{(5,4),(3,4),(5,2),(1,2)}

Example 2: {(5,4),(3,4),(5,2),(1,2)}

Example 3：{(9，1111110000)；(7,1111110000)；(7,1111111100)；(3,1111111100)}

Example 3: {(9,1111110000);(7,1111110000);(7,1111111100);(3,1111111100)}

In this case, the method further includes determining when the indication information needs to be received.

Specifically, the method further includes: for a certain PDCCH subframe of the primary serving cell, during activating period, if the PDCCH subframe is aligned with a subframe of a secondary serving cell of the unlicensed band or If the user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe,

If the subframe of the primary serving cell before the certain PDCCH subframe is not a PDCCH subframe, or the subframe of the previous primary serving cell is a PDCCH subframe but not within an active time period, the user The device decodes the downlink control information to obtain uplink and downlink configuration information.

For example, during the active time, when Signaling B adopts the design method of the cell common signaling, for a certain PDCCH-subframe of the PCell overlapping with the LAA Scell subframe that satisfies the condition C1, if the PDCCH-subframe satisfies the following conditions Any one of the UEs, the UE will decode Signaling B on the PDCCH-subframe of the PCell;

E1: the subframe of the PCell before the PDCCH-subframe is not a PDCCH-subframe;

E2: The subframe of the PCell before this PDCCH-subframe is a PDCCH-subframe, but not in the active time.

The following examples illustrate which subframes of the LAA Scell need to perform PDCCH snooping and when it is necessary to decode Singnaling A or Singaling B.

FIG. 6 is another exemplary diagram of an uplink and downlink configuration in a transmission period according to an embodiment of the present invention. As shown in FIG. 6, it is assumed that the UE is configured with one LAA SCell. DRX cycle = 20 ms; active period (also called On duration) = 6 ms; PCell configuration is TDD configuration 0; N = 10; M = 1.

表示)外，UE还需要监听的LAA SCell的子帧包括：Then during the active time, except for the PDCCH-subframe on the Pcell (using

In addition, the subframes of the LAA SCell that the UE also needs to monitor include:

用

表示的子帧(LAA Scell上的Raido frame 1中的subframe 0、1和5)：即满足C1条件的子帧；

use

a sub-frame (subframes 0, 1, and 5 in Raido frame 1 on the LAA Scell): a subframe that satisfies the C1 condition;

用

表示的子帧(LAA Scell上的Raido frame 1中的subframe 6)：即满足C2条件的子帧；

use

a sub-frame to be represented (subframe 6 in Raido frame 1 on the LAA Scell): a subframe that satisfies the C2 condition;

用

表示的子帧(LAA Scell上的Raido frame 1中的subframe 7)：即满足C3条件的子帧；

use

The represented subframe (subframe 7 in the Raido frame 1 on the LAA Scell): that is, the subframe that satisfies the C3 condition;

In addition, if the UL/DL configuration information is transmitted by using Signaling A, the UE needs to decode the subframe of Signaling A on the LAA SCell, including: the subframe indicated by blue on the LAA Scell.

In addition, if the UL/DL configuration information is transmitted by using Signaling B, the UE needs to decode the subframe of Signaling B on the LAA SCell, including:

Case 1: When Signaling B adopts the design method of UE-specific signaling, and LAA SCell adopts self-scheduling: subframes 0, 1, and 5 in Raido frame 1 on LAA Scell.

Case 2: When Signaling B adopts the design method of UE-specific signaling, and LAA SCell configures Cross-carrier scheduling and its scheduling serving cell is PCell; or when Signaling B adopts the cell public signaling design method:

PDCCH-subframe 0 in Raido frame 1, that is, a subframe that satisfies condition D2;

PDCCH-subframe 5 in Radio frame 1, that is, a subframe that satisfies condition D1.

It can be seen from the foregoing embodiment that even in a system configured with an unlicensed frequency band, the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.

Example 2

An embodiment of the present invention provides a device for performing PDCCH monitoring, which is configured in a user equipment of a primary serving cell configured with at least a licensed frequency band and a secondary serving cell of an unlicensed frequency band. The same content of the embodiment of the present invention and the first embodiment will not be described again.

FIG. 7 is a schematic diagram of an apparatus for performing PDCCH monitoring according to an embodiment of the present invention. As shown in FIG. 7, the apparatus 700 includes:

The first subframe determining unit 701, the downlink subframe of the secondary serving cell of the user equipment except the unlicensed frequency band and/or other serving cells configured to be cross-carrier scheduled serving cells, and the subframe including the DwPTS in the TDD system The union of the PDCCH subframes determined as the user equipment;

a second subframe determining unit 702, for each subframe of the secondary serving cell of the unlicensed band,

During the activation period of the user equipment, if the user equipment is not required by the base station to perform uplink transmission on the subframe, the subframe is determined as a subframe for performing PDCCH monitoring; or, during activation of the user equipment During the period, if the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to perform PDCCH monitoring. a sub-frame; or, during the activation period of the user equipment, if the user equipment knows that the subframe is a downlink subframe, determining the subframe as a subframe for performing PDCCH snooping;

The monitoring unit 703, during the activation period of the user equipment, the PDCCH subframe determined by the first subframe determining unit 701 and the second subframe determining unit 702 determined to perform PDCCH monitoring. The subframe is monitored by the PDCCH.

FIG. 8 is another schematic diagram of an apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus 800 includes: a first subframe determining unit 701, a second subframe determining unit 702, and a listening unit 703; as described above.

As shown in FIG. 8, the apparatus 800 may further include:

The first receiving unit 801 receives the indication information sent by the base station. The second subframe determining unit 702 is further configured to: learn, by using the indication information sent by the base station, that the subframe is a downlink subframe.

In this embodiment, the other serving cell includes: a primary serving cell on the licensed frequency band, and zero Secondary serving cells on one or more licensed bands.

As shown in FIG. 8, the apparatus 800 may further include:

The second receiving unit 802 receives information sent by the base station for scheduling the user equipment to perform uplink data transmission on the subframe. The second subframe determining unit 702 is further configured to: determine whether the base station is sent by the base station to schedule the user equipment to perform uplink data transmission on the subframe, Uplink transmission is required on the subframe.

In this embodiment, the indication information sent by the base station includes uplink and downlink configuration information of each subframe in a transmission period, or uplink and downlink configuration information of each subframe in the remaining subframes of the transmission period; wherein the transmission period The maximum length of time that the base station can occupy after preempting the channel corresponding to the secondary serving cell of the unlicensed band.

In an embodiment, the indication information sent by the base station is included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band.

As shown in FIG. 8, the apparatus 800 may further include:

The first decoding unit 803, when the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe during an activation period, but the subframe is aligned or overlapped with the PDCCH subframe, The reserved signal is decoded to obtain uplink and downlink configuration information of the secondary serving cell of the unlicensed frequency band.

In another embodiment, the indication information sent by the base station is included in downlink control information sent by using a PDCCH.

In one case, the downlink control information is carried by user equipment dedicated signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or in the case of cross-carrier scheduling configured in the non-authorized The scheduling service cell of the secondary serving cell of the frequency band is sent.

The downlink control information includes at least: a number of remaining subframes in the transmission period and a number of downlink subframes of the remaining subframes; or, a number of downlink subframes of the remaining subframes in the transmission period, and the remaining subframes The number of uplink subframes of the frame; or the number of remaining subframes in the transmission period and a bitmap indicating an uplink and downlink configuration of the remaining subframes in the transmission period.

In addition, the downlink control information may further include: a cell index of the secondary serving cell of the unlicensed band.

In an embodiment, the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, and the apparatus 800 may further include:

The second decoding unit 804, during the activation period, the user equipment does not know whether the subframe is an uplink subframe or In the case of a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the downlink control information is decoded to obtain uplink and downlink configuration information.

In another embodiment, the PDCCH is sent on a scheduling serving cell that is scheduled by using a cross-carrier, and the apparatus 800 may further include:

The third decoding unit 805, for a certain PDCCH subframe of the scheduling serving cell, during the activation period, if the PDCCH subframe is aligned or overlapped with a subframe of the secondary serving cell of the unlicensed band, and The user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe.

If the subframe of the scheduling serving cell before the certain PDCCH subframe is not a PDCCH subframe, or the subframe of the scheduling serving cell before the certain PDCCH subframe is a PDCCH subframe but is not in an active period The downlink control information is decoded to obtain uplink and downlink configuration information.

In another case, the downlink control information is carried by the cell common signaling; the PDCCH is sent on the primary serving cell of the user equipment.

The downlink control information includes multiple information elements; wherein the number of each information element corresponds to an index value of a secondary serving cell of an unlicensed frequency band;

Each information element may include at least: a number of remaining subframes in the transmission period and a number of downlink subframes of the remaining subframes; or a number of downlink subframes of the remaining subframes in the transmission period and the remaining subframes The number of uplink subframes; or the number of remaining subframes in the transmission period and a bitmap indicating uplink and downlink configurations of the remaining subframes in the transmission period.

As shown in FIG. 8, the apparatus 800 may further include:

The fourth decoding unit 806, for a certain PDCCH subframe of the primary serving cell, during the activation period, if the PDCCH subframe is aligned or overlapped with a subframe of the secondary serving cell of the unlicensed band and The user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe.

If the subframe of the primary serving cell before the certain PDCCH subframe is not a PDCCH subframe, or the subframe of the primary serving cell before the certain PDCCH subframe is a PDCCH subframe but is not in an active period The user equipment decodes the downlink control information to obtain uplink and downlink configuration information.

An embodiment of the present invention further provides a user equipment, which is configured with the apparatus 700 or 800 as described above.

FIG. 9 is a schematic diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 9, the user equipment 900 can A central processing unit 100 and a memory 140 are included; the memory 140 is coupled to the central processing unit 100. It should be noted that the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.

In one embodiment, the functionality of the apparatus 700 or 800 that performs PDCCH snooping may be integrated into the central processor 100. The central processing unit 100 can be configured to perform the following control:

And a downlink subframe of a secondary serving cell of the user equipment except the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe and the TDD system including the DwPTS The union of the subframes is determined as the PDCCH subframe of the user equipment;

For each subframe of the secondary serving cell of the unlicensed band,

In a case where the user equipment is not required by the base station to perform uplink transmission on the subframe during an active time of the user equipment, determining the subframe as a subframe for performing PDCCH monitoring; or During the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but if the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to be a PDCCH. a subframe to be monitored; or, in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, determining the subframe as a subframe for performing PDCCH monitoring;

During the activation period of the user equipment, the user equipment performs monitoring of the PDCCH for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.

In another embodiment, the apparatus 700 or 800 for performing PDCCH monitoring may be configured separately from the central processing unit 100. For example, the apparatus 700 or 800 may be configured as a chip connected to the central processing unit 100, and implemented by the control of the central processing unit. The function of device 700 or 800.

As shown in FIG. 9, the user equipment 900 may further include: a communication module 110, an input unit 120, an audio processing unit 130, a memory 140, a camera 150, a display 160, and a power source 170. The functions of the above components are similar to those of the prior art, and are not described herein again. It should be noted that the user equipment 900 does not have to include all the components shown in FIG. 9, and the above components are not required; in addition, the user equipment 900 may further include components not shown in FIG. There are technologies.

It can be seen from the foregoing embodiment that even in a system configured with an unlicensed frequency band, the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.

Example 3

The embodiment of the invention provides a method for performing PDCCH monitoring, which is applied to a base station side. The embodiment of the present invention corresponds to Embodiment 1, and the same content is not described again.

FIG. 10 is a schematic diagram of a method according to an embodiment of the present invention. As shown in FIG. 10, the method includes:

Step 1001: The base station sends the indication information to the user equipment, so that the user equipment learns that a subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe; and/or

Step 1002: The base station sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.

In this embodiment, there is no order relationship between step 1001 and step 1002. Step 1001 may be performed first, or step 1002 may be performed first, or may be performed simultaneously. In addition, the above steps 1001 and 1002 may be performed only one of them, or may be performed. The invention is not limited thereto.

Furthermore, FIG. 10 only schematically shows information transmission between the base station and the user equipment related to the present invention, but the present invention is not limited thereto. For other indications or feedbacks between the base station and the user equipment, refer to related technologies, and details are not described herein again.

In this embodiment, the indication information may be included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band; or the indication information is included to be sent by using a PDCCH. In the downlink control information.

The downlink control information may be carried by user equipment-specific signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or in the unlicensed frequency band if cross-carrier scheduling is configured. Sending on the scheduling service cell of the serving cell;

Alternatively, the downlink control information may also be carried by the cell common signaling; the PDCCH is sent on the primary serving cell of the user equipment.

It can be seen from the foregoing embodiment that even in a system configured with an unlicensed frequency band, the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.

Example 4

The embodiment of the invention provides an apparatus for performing PDCCH monitoring, which is configured in a base station. The same content of the embodiment of the present invention and the first to third embodiments will not be described again.

FIG. 11 is a schematic diagram of an apparatus according to an embodiment of the present invention. As shown in FIG. 11, the apparatus 1100 includes:

The first sending unit 1101 sends the indication information to the user equipment, so that the user equipment learns that a certain subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe; and/or

The second sending unit 1102 sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.

In this embodiment, the indication information may be included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band; or the indication information is included to be sent by using a PDCCH. In the downlink control information.

The downlink control information may be carried by user equipment-specific signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or in the unlicensed frequency band if cross-carrier scheduling is configured. Sending on the scheduling service cell of the serving cell;

Alternatively, the downlink control information may also be carried by the cell common signaling; the PDCCH is sent on the primary serving cell of the user equipment.

The embodiment of the invention further provides a base station, which is configured with the device 1100 as described above.

FIG. 12 is a schematic diagram of a structure of a base station according to an embodiment of the present invention. As shown in FIG. 12, base station 1200 can include a central processing unit (CPU) 200 and memory 210; and memory 210 is coupled to central processing unit 200. The memory 210 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 200.

The base station 1200 can implement the method for performing PDCCH monitoring as described in Embodiment 3. The central processor 200 can be configured to implement the functionality of the device 1100; that is, the central processor 200 can be configured to perform the following controls:

Sending the indication information to the user equipment, so that the user equipment learns that a certain subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe; and/or sends, to the user equipment, the user equipment to be scheduled in the sub The information of the uplink data transmission on the frame is such that the user equipment determines that uplink transmission is required to be performed on the subframe.

In addition, as shown in FIG. 12, the base station 1200 may further include: a transceiver 220, an antenna 230, and the like; wherein the functions of the foregoing components are similar to those of the prior art, and details are not described herein again. It should be noted that the base station 1200 does not have to include all the components shown in FIG. 12; in addition, the base station 1200 may further include not shown in FIG. For the components, refer to the prior art.

It can be seen from the foregoing embodiment that even in a system configured with an unlicensed frequency band, the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.

Example 5

The embodiment of the present invention further provides a communication system, and the same contents as those of Embodiments 1 to 4 are not described herein.

FIG. 13 is a schematic diagram of a communication system according to an embodiment of the present invention. As shown in FIG. 13, the communication system 1300 includes: a user equipment 1301, which will perform secondary service cells other than unlicensed frequency bands and/or configured to be cross-carrier scheduled. The union of the downlink subframes of the other serving cells outside the serving cell, or the combination of the downlink subframe and the subframe including the DwPTS in the TDD system is determined as the PDCCH subframe of the user equipment;

For each subframe of the secondary serving cell of the unlicensed band,

If the user equipment is not required by the base station to perform uplink transmission on the subframe during the activation period, determining the subframe as a subframe for performing PDCCH monitoring; or, during the activation period, the user equipment does not If the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined as a subframe for performing PDCCH monitoring; or In a case where the user equipment knows that the subframe is a downlink subframe during an activation period, determining the subframe as a subframe for performing PDCCH monitoring;

During the activation period of the user equipment, the user equipment performs monitoring of the PDCCH for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.

As shown in FIG. 9, the communication system 1300 further includes:

The base station 1302 sends, to the user equipment 1301, information for scheduling the user equipment 1301 to perform uplink data transmission on the subframe, so that the user equipment 1301 determines that uplink transmission is required to be performed on the subframe; And/or, sending the indication information to the user equipment 1301, so that the user equipment 1301 learns that the subframe is a downlink subframe.

An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a user equipment, the program causes a computer to perform a method for performing PDCCH monitoring as described in Embodiment 1 in the user equipment.

Embodiments of the present invention provide a storage medium storing a computer readable program, wherein the computer readable The program causes the computer to perform the method of performing PDCCH monitoring as described in Embodiment 1 in the user equipment.

An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to perform a method of performing PDCCH monitoring as described in Embodiment 3 in the base station.

An embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a method of performing PDCCH monitoring as described in Embodiment 3 in a base station.

The above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that A person skilled in the art can make various modifications and changes to the present invention within the scope of the present invention.

Claims (20)

A device for performing PDCCH monitoring, the device comprising: a first subframe determining unit, or a downlink subframe of a secondary serving cell of the user equipment except the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe And determining, by the union of the subframes including the downlink pilot time slots in the TDD system, the PDCCH subframe of the user equipment; a second subframe determining unit, for each subframe of the secondary serving cell of the unlicensed band, During the activation period of the user equipment, if the user equipment is not required by the base station to perform uplink transmission on the subframe, determining the subframe as a subframe for performing PDCCH monitoring; or, at the user During the activation period of the device, if the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined. a subframe for performing PDCCH snooping; or, during the activation period of the user equipment, if the user equipment knows that the subframe is a downlink subframe, determining the subframe as a subframe for performing PDCCH snooping ; a monitoring unit, during the activation period of the user equipment, the subframe that is determined by the first subframe determining unit and the subframe determined by the second subframe determining unit to perform PDCCH monitoring, Perform PDCCH monitoring. The apparatus of claim 1 wherein said apparatus further comprises: The first receiving unit receives the indication information sent by the base station; The second subframe determining unit learns that the subframe is a downlink subframe by receiving the indication information sent by the base station. The apparatus of claim 1, wherein the other serving cell comprises: a primary serving cell on a licensed frequency band, and a secondary serving cell on zero or one or more licensed frequency bands. The apparatus of claim 1 wherein said apparatus further comprises: a second receiving unit, configured to receive, by the base station, information for scheduling, by the user equipment, uplink data transmission on the subframe; Determining, by the second subframe determining unit, whether the information sent by the base station for scheduling uplink data transmission on the subframe by the user equipment is determined, whether the base station requests the subframe Perform uplink transmission. The apparatus according to claim 2, wherein the indication information sent by the base station comprises uplink and downlink configuration information of each subframe in a transmission period, or uplink and downlink configuration information of each subframe in the remaining subframes of the transmission period; The transmission period is a maximum length of time that the base station can occupy after preempting the channel corresponding to the secondary serving cell of the unlicensed frequency band. The apparatus according to claim 2, wherein the indication information sent by the base station is included in a reserved signal, and the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band. The apparatus of claim 6 wherein said apparatus further comprises: a first decoding unit, when the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe during an activation period, but the subframe is aligned or overlapped with the PDCCH subframe, The reserved signal is decoded to obtain uplink and downlink configuration information of the secondary serving cell of the unlicensed frequency band. The apparatus according to claim 2, wherein the indication information sent by the base station is included in downlink control information transmitted through a PDCCH. The apparatus according to claim 8, wherein the downlink control information is carried by user equipment dedicated signaling; the PDCCH is transmitted on a secondary serving cell of the unlicensed frequency band, or in a case where cross-carrier scheduling is configured And transmitting on a scheduling serving cell of a secondary serving cell of the unlicensed frequency band. The apparatus according to claim 9, wherein the downlink control information comprises at least: The number of remaining subframes in the transmission period and the number of downlink subframes of the remaining subframes; Or the number of downlink subframes of the remaining subframes in the transmission period and the number of uplink subframes of the remaining subframes; Or a number of remaining subframes in the transmission period and a bitmap indicating an uplink and downlink configuration of the remaining subframes in the transmission period. The apparatus according to claim 10, wherein the downlink control information further comprises: a cell index of a secondary serving cell of the unlicensed band. The apparatus according to claim 9, wherein the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, the device further comprising: a second decoding unit, when the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe during an activation period, but the subframe is aligned or overlapped with the PDCCH subframe, The downlink control information is decoded to obtain uplink and downlink configuration information. The apparatus according to claim 9, wherein the PDCCH is sent on a scheduling serving cell that is scheduled by using a cross-carrier, the device further comprising: a third decoding unit, for a certain PDCCH subframe of the scheduling serving cell, during the activation period, if the PDCCH subframe is aligned or overlapped with a subframe of the secondary serving cell of the unlicensed band, and the The user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe. If the subframe of the scheduling serving cell before the certain PDCCH subframe is not a PDCCH subframe, or the subframe of the scheduling serving cell before the certain PDCCH subframe is a PDCCH subframe but is not in an active period The downlink control information is decoded to obtain uplink and downlink configuration information. The apparatus according to claim 8, wherein the downlink control information is carried by a cell common signaling; the PDCCH is sent on a primary serving cell of the user equipment. The apparatus according to claim 14, wherein the downlink control information comprises a plurality of information elements; wherein a number of each information element corresponds to an index value of a secondary serving cell of a certain unlicensed frequency band; Each information element includes at least: The number of remaining subframes in the transmission period and the number of downlink subframes of the remaining subframes; Or the number of downlink subframes of the remaining subframes in the transmission period and the number of uplink subframes of the remaining subframes; Or a number of remaining subframes in the transmission period and a bitmap indicating an uplink and downlink configuration of the remaining subframes in the transmission period. The apparatus of claim 14 wherein said apparatus further comprises: a fourth decoding unit, for a certain PDCCH subframe of the primary serving cell, during the activation period, if the PDCCH subframe is aligned or overlapped with a subframe of the secondary serving cell of the unlicensed band, and the The user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe. If the subframe of the primary serving cell before the certain PDCCH subframe is not a PDCCH subframe, or the subframe of the primary serving cell before the certain PDCCH subframe is a PDCCH subframe but is not in an active period The downlink control information is decoded to obtain uplink and downlink configuration information. A device for performing PDCCH monitoring, the device comprising: The first sending unit sends the indication information to the user equipment, so that the user equipment learns that a certain subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe; and/or The second sending unit sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe. The apparatus according to claim 17, wherein the indication information is included in a reserved signal, and the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band; Or the indication information is included in downlink control information sent by using a PDCCH. The apparatus according to claim 18, wherein the downlink control information is carried by user equipment dedicated signaling; the PDCCH is transmitted on a secondary serving cell of the unlicensed frequency band, or in a case where cross-carrier scheduling is configured Transmitting on a scheduling serving cell of a secondary serving cell of the unlicensed frequency band; Or the downlink control information is carried by the cell common signaling; the PDCCH is sent on a primary serving cell of the user equipment. A communication system, the communication system comprising: The user equipment, the downlink subframe of the secondary serving cell except the unlicensed frequency band and/or the other serving cell configured to be the cross-carrier scheduled serving cell, or the downlink subframe and the TDD system include the downlink guide The union of the subframes of the frequency slot is determined as the PDCCH subframe of the user equipment; For each subframe of the secondary serving cell of the unlicensed band, In the case that the user equipment is not required to perform uplink transmission on the subframe during the activation period, or during the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but In a case where the subframe is aligned or overlapped with the PDCCH subframe, or in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, the user equipment uses the subframe Determining a subframe for performing PDCCH snooping; During the activation period of the user equipment, the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring; The base station sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe; and/or, And sending the indication information to the user equipment, so that the user equipment learns that the subframe is a downlink subframe.

Images