CN103716143A

CN103716143A - Time division duplex dynamic frame structure configuration method, determination method and corresponding device

Info

Publication number: CN103716143A
Application number: CN201210370368.8A
Authority: CN
Inventors: 张晓博
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-09-28
Filing date: 2012-09-28
Publication date: 2014-04-09
Anticipated expiration: 2032-09-28
Also published as: CN103716143B

Abstract

The invention discloses a time division duplex dynamic frame structure configuration method, a time division duplex dynamic frame structure determination method and a corresponding device. With the time division duplex dynamic frame structure configuration method, determination method and the corresponding device adopted, robustness can be improved, and no restriction is imposed on scheduling. The time division duplex dynamic frame structure configuration method including the following steps that: a frame structure is selected, and sub frames in one group of downlink sub frames of the frame structure, which arrives at use equipment at first, are determined, wherein this group of downlink sub frames is corresponding to the same uplink feedback, and the uplink feedback is used for indicating whether data receiving of corresponding downlink sub frame groups is correct or not; and downlink allocation index (DAI) values in downlink control information (DCI) in the sub frames are set, wherein the downlink allocation index (DAI) values are used for performing dynamic frame structure indication. A dynamic frame structure configuration device includes a frame structure determination module, a sub frame determination module and a configuration module. According to the time division duplex dynamic frame structure configuration method provided by the invention, downlink allocation index (DAI) bits in the downlink control information (DCI) of specific sub frames are utilized to dynamically configure the frame structure, and therefore, no restriction will be imposed on the scheduling, and the robustness of a system can be improved.

Description

Time division duplex dynamic frame structure configuration method, determination method and corresponding device

Technical Field

The present invention relates to the field of communications, and in particular, to a Time Division Duplex (TDD) dynamic frame structure configuration method, a Time Division Duplex determination method, and a corresponding apparatus.

Background

In LTE (Long Term Evolution) and LTE-a (LTE-advanced) standards, a system frame of TDD is composed of ten subframes. The 3GPP supports 7 frame structures altogether, as shown in table 1, where D denotes a subframe for Downlink transmission, U denotes a subframe for Uplink transmission, and S denotes a special subframe and includes three special Time slots, namely, a Downlink Pilot Time Slot (DwPTS for Downlink transmission), a Guard interval (Guard Period for GP for short), and an Uplink Pilot Time Slot (UpPTS for Uplink transmission).

Table 1: uplink and downlink frame structure of TDD system

Currently, in the 3GPP standard, a frame structure configured by a current serving cell of a User Equipment (UE) is informed by system information SIB-I. According to the existing standard, the minimum variation period of SIB (System Information Block) Information is 640 ms. In a pre-research project of "adaptive TDD frame structure" approved by 3GPP in RAN54 (12 months 2011) for the second time, it is possible to more dynamically allocate the frame structure of the TDD system. Shortening the variation period of the frame structure of the TDD system can make full use of the TDD characteristics to better support the transmission of asymmetric traffic.

Using physical layer signaling to dynamically adjust the frame structure is the most flexible allocation method, however, the physical layer signaling configuration needs to solve several problems:

1. design of a dynamic DCI (Downlink Control Information) signaling, which may cause extra UE burden regardless of designing a new DCI format or defining a new RNTI (radio network temporary identity), and scheduling restrictions, such as the need to allocate multiple subframes to a UE;

2. robustness of dynamic DCI: another problem with dynamic DCI is robustness, the UE cannot acquire the actual transmission frame structure if it cannot demodulate the PDCCH correctly.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a time division duplex dynamic frame structure configuration method, a determination method and a corresponding device, which improve robustness and have no limit to scheduling.

To solve the above technical problem, the present invention provides a Time Division Duplex (TDD) dynamic frame structure configuration method, comprising:

selecting a frame structure, and determining a subframe which reaches user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, wherein the uplink feedback is used for indicating whether the group data of the corresponding downlink subframes is received correctly or not;

setting a Downlink Assignment Index (DAI) value in Downlink Control Information (DCI) in the subframe, the DAI value being used for dynamic frame structure indication.

Further, selecting a frame structure, comprising: and selecting the frame structure with the maximum number of downlink subframes in a frame structure hopping candidate set in the current System Information Block (SIB) period or the frame structure broadcasted by the SIB.

Further, the determining a subframe, which is the earliest subframe to reach the user equipment, in a group of downlink subframes corresponding to the same uplink feedback of the frame structure includes:

the subframe is a subframe which meets the following condition one and condition two:

the method comprises the following steps that firstly, the subframe is subframe 0 or subframe 1 or subframe 5 or subframe 6 of a frame structure 0; or subframe 0 or subframe 4 or subframe 5 or subframe 9 of frame structure 1; or subframe 4 or subframe 9 of frame structure 2; or subframe 1 or subframe 7 or subframe 9 of frame structure 3; or subframe 0 or subframe 6 of frame structure 4; or subframe 9 of frame structure 5; or subframe 0 or subframe 1 or subframe 5 or subframe 6 or subframe 9 of frame structure 6;

second, the DCI format in the subframe is one of the following formats: DCI1, DCI1A, DCI1B, DCI1D, DCI2A, DCI2B, DCI 2C.

Further, after determining a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, when there are a plurality of DCIs in a subframe which satisfies a first condition, the method further includes: selecting DCI according to the following conditions, wherein DAI in the selected DCI is used for performing dynamic frame structure indication:

judging DCI (downlink control information) to be detected first by User Equipment (UE) according to a Physical Downlink Control Channel (PDCCH) blind detection formula; or

DCI for scheduling a UE primary carrier; or

And the DCI is used for scheduling the UE to preset the auxiliary carrier.

determining subframes satisfying the following condition three and condition four:

thirdly, the subframe is a fixed downlink subframe X of any frame structure of frame structures 1-6;

conditional four, the DCI format in the subframe is one of the following formats: DCI0, DCI 4.

Further, the fixed downlink subframe X is a subframe 5, and a Physical Uplink Shared Channel (PUSCH) scheduled by a DAI in DCI in the subframe complies with a timing relationship of a frame structure 6.

Further, the setting the DAI value in the DCI in the subframe includes: and setting the DAI value to indicate the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period.

Further, the method further comprises: and setting the DAI value in the DCI in the downlink subframe except the subframe, wherein the DAI value is used for DAI configuration.

Further, the setting of the DAI value in the DCI in the downlink subframe other than the subframe includes:

and setting the DAI value in DCI in downlink subframes except the subframes according to the frame structure in the current SIB period as the frame structure with the largest number of downlink subframes in the hopping candidate set.

Further, the frame structure hopping candidate set includes 4 or less frame structures.

Further, the frame structure hopping candidate set includes 5 or more frame structures, and the method further includes:

combining the DAI value in DCI in 1 subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure with the position of the subframe, and jointly indicating the frame structure with the largest number of downlink subframes in a frame structure hopping candidate set in the current SIB period; or,

and jointly indicating the frame structure with the maximum number of downlink subframes in the frame structure hopping candidate set in the current SIB period by adopting the DAI values in DCI (Downlink information interface) in a plurality of subframes which arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure.

Further, a subframe, which is the earliest subframe to reach the user equipment, in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure includes: subframe 6 of frame structure 0, or subframe 5 of frame structure 1, or subframe 4 of frame structure 2, or subframe 1 of frame structure 3, or subframe 0 of frame structure 4, or subframe 9 of frame structure 5, or subframe 5 of frame structure 6;

the method further comprises the following steps: and receiving a response message sent by the UE in the next subframe of the subframes, wherein the response message is a response aiming at the dynamic frame structure indication.

In order to solve the above technical problem, the present invention further provides a method for determining a Time Division Duplex (TDD) dynamic frame structure, including:

receiving the subframe, and acquiring a Downlink Assignment Index (DAI) value in Downlink Control Information (DCI) in the subframe, wherein the DAI value is used for indicating a dynamic frame structure;

and determining the frame structure of the current frame or the next frame according to the DAI value.

Further, after determining a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, when there are a plurality of DCIs in a subframe which satisfies a first condition, the acquiring a DAI value in the DCI in the subframe includes:

judging DCI (downlink control information) detected by User Equipment (UE) firstly according to a Physical Downlink Control Channel (PDCCH) blind detection formula, and acquiring a DAI (digital interface indicator) value in the DCI; or

Determining DCI used for scheduling UE main carrier, and acquiring DAI value in the DCI; or

Determining DCI (downlink control information) for scheduling UE (user equipment) preset auxiliary carriers, and acquiring a DAI (digital interface) value in the DCI.

Further, the fixed downlink subframe X is subframe 5.

Further, the method further comprises: and receiving downlink subframes except the subframes, and acquiring DAI values in DCI in the downlink subframes except the subframes, wherein the DAI values are used for DAI configuration.

Further, the determining the frame structure of the current frame or the next frame according to the DAI value includes:

directly determining a frame structure indicated by a DAI value according to the DAI value in DCI in 1 subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure, wherein the frame structure is used as a frame structure of a current frame or a next frame; or,

determining a frame structure indicated by a DAI value according to the combination of the DAI value in DCI in 1 subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure and the position of the subframe, wherein the frame structure is used as the frame structure of a current frame or a next frame; or,

and determining a frame structure indicated by the DAI value according to the DAI value in DCI in a plurality of subframes which arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure, wherein the frame structure is used as the frame structure of the current frame or the next frame.

and the user equipment sends a response message aiming at the dynamic frame structure indication in the next subframe of the subframes.

In order to solve the above technical problem, the present invention further provides a Time Division Duplex (TDD) dynamic frame structure configuration apparatus, including a frame structure determining module, a subframe determining module, and a configuration module, wherein:

the frame structure determining module is used for selecting a frame structure;

the subframe determining module is configured to determine a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure determined by the frame structure determining module, where the uplink feedback is used to indicate whether group data of the corresponding downlink subframes is received correctly or not;

the configuration module is configured to set a Downlink Assignment Index (DAI) value in Downlink Control Information (DCI) in the subframe, where the DAI value is used for performing a dynamic frame structure indication.

Further, the frame structure determining module selects a frame structure comprising:

the frame structure determining module selects a frame structure with the largest number of downlink subframes in a frame structure hopping candidate set in a current System Information Block (SIB) period or a frame structure broadcasted by the SIB.

Further, the determining a subframe that will arrive at the ue earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure by the subframe determining module includes:

the subframe determining module selects a subframe meeting the following condition one and condition two as a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure:

Further, after determining the earliest subframe to reach the user equipment in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, when there are multiple DCIs in a subframe satisfying the first condition, the subframe determining module is further configured to select the DCI according to the following conditions, and a DAI in the selected DCI is used to perform dynamic frame structure indication:

DCI for scheduling a UE primary carrier; or

And the DCI is used for scheduling the UE to preset the auxiliary carrier.

the subframe determining module selects subframes meeting the following conditions three and four as subframes which arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure:

Further, the fixed downlink subframe X is subframe 5.

Further, the configuring module sets a DAI value in DCI in a subframe, including:

and the configuration module sets the DAI value to indicate the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period.

Further, the configuration module is further configured to set a DAI value in DCI in a downlink subframe other than the subframe, where the DAI value is used to perform DAI configuration.

Further, the setting, by the configuration module, a DAI value in DCI in a downlink subframe other than the subframe includes:

and the configuration module sets the DAI value in DCI in downlink subframes except the subframes according to the frame structure in the current SIB period as the frame structure with the largest number of downlink subframes in the hopping candidate set.

Further, the frame structure hopping candidate set includes 5 or more frame structures, and the configuration module is further configured to:

Further, the determining, by the subframe determining module, a subframe that arrives earliest at the ue in a group of downlink subframes corresponding to the same uplink feedback in the frame structure includes: subframe 6 of frame structure 0, or subframe 5 of frame structure 1, or subframe 4 of frame structure 2, or subframe 1 of frame structure 3, or subframe 0 of frame structure 4, or subframe 9 of frame structure 5, or subframe 5 of frame structure 6;

the device further comprises a receiving module, configured to receive, in a subframe next to the subframe, a response message sent by the UE, where the response message is a response to the dynamic frame structure indication.

In order to solve the above technical problem, the present invention further provides a device for determining a Time Division Duplex (TDD) dynamic frame structure, including a subframe determining module, a receiving module, and a dynamic frame structure determining module, wherein:

the subframe determining module is used for selecting a frame structure and determining a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, wherein the uplink feedback is used for indicating whether the group data of the corresponding downlink subframes is received correctly or not;

the receiving module is configured to receive the subframe, and obtain a Downlink Assignment Index (DAI) value in Downlink Control Information (DCI) in the subframe, where the DAI value is used for performing a dynamic frame structure indication;

and the dynamic frame structure determining module is used for determining the frame structure of the current frame or the next frame according to the DAI value.

Further, the subframe determination module selects a frame structure comprising:

the subframe determination module selects a frame structure with the largest number of downlink subframes in a frame structure hopping candidate set in a current System Information Block (SIB) period or a frame structure broadcasted by the SIB.

Further, after the subframe determining module determines that the subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure is a subframe, when there are a plurality of DCIs in a subframe which satisfies a first condition, the receiving module acquires a DAI value in the DCI in the subframe, including:

Further, the subframe X is subframe 5.

Further, the receiving module is further configured to receive a downlink subframe other than the subframe, and acquire a DAI value in DCI in the downlink subframe other than the subframe, where the DAI value is used for DAI configuration.

Further, the determining module of the dynamic frame structure determines the frame structure of the current frame or the next frame according to the DAI value, including:

the dynamic frame structure determining module directly determines a frame structure indicated by a DAI value according to the DAI value in DCI in 1 subframe which arrives at the earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure received by the receiving module, and the frame structure is used as a frame structure of a current frame or a next frame; or

The dynamic frame structure determining module determines a frame structure indicated by a DAI value according to the combination of the DAI value in DCI in 1 subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback received by the receiving module and the position of the subframe, and the frame structure is used as a frame structure of a current frame or a next frame; or,

and the dynamic frame structure determining module determines the frame structure indicated by the DAI value according to the DAI value in the DCI in a plurality of subframes which arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure received by the receiving module, and the frame structure is used as the frame structure of the current frame or the next frame.

the apparatus further comprises a transmitting module configured to transmit a response message for the dynamic frame structure indication in a subframe next to the subframe.

By adopting the method and the device provided by the application, the frame structure is dynamically configured by utilizing the DAI bit in the DCI in the specific subframe, no limitation is brought to scheduling, the robustness of the system is provided, and the method and the device are particularly suitable for an LTE-advanced (3GPP Release 12) TDD communication system.

Drawings

FIG. 1 is a flow chart of example 1;

FIG. 2 is a schematic structural diagram of an apparatus for configuring a dynamic frame structure according to embodiment 1;

FIG. 3 is a flowchart of example 2;

fig. 4 is a schematic structural diagram of a dynamic frame structure determining apparatus according to embodiment 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Example 1

The present embodiment introduces a TDD dynamic frame structure configuration method, and the method of the present embodiment mainly aims at a base station side, as shown in fig. 1, and includes the following steps:

step 101, selecting a frame structure, and determining a subframe which reaches user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, wherein the uplink feedback is used for indicating whether the group data of the corresponding downlink subframes is received correctly or not;

the group of downlink subframes is a downlink subframe group, and the downlink subframe group is: mapping to one or more downlink subframes of an uplink feedback according to a downlink physical shared channel (PDSCH) and uplink feedback (ACK or NACK) timing relationship of an existing definition (3GPP Release 8).

In a preferred embodiment, the manner of selecting a frame structure comprises: and selecting a frame structure with the largest number of downlink subframes in a frame structure hopping candidate set in the current System Information Block (SIB) period or selecting a frame structure broadcasted by the SIB (the frame structure is adopted when the number of downlink subframes in the frame structure hopping candidate set does not exceed 4).

The method of selecting the subframe may be various:

method one, the subframe is a subframe satisfying the following conditions 1 and 2:

condition 1, the subframe shown in table 2 includes: the subframe is subframe 0 or subframe 1 or subframe 5 or subframe 6 of a frame structure 0; or subframe 0 or subframe 4 or subframe 5 or subframe 9 of frame structure 1; or subframe 4 or subframe 9 of frame structure 2; or subframe 1 or subframe 7 or subframe 9 of frame structure 3; or subframe 0 or subframe 6 of frame structure 4; or subframe 9 of frame structure 5; or subframe 0 or subframe 1 or subframe 5 or subframe 6 or subframe 9 of frame structure 6;

conditional 2, the DCI format in the subframe is one of: DCI1, DCI1A, DCI1B, DCI1D, DCI2, DCI2A, DCI2B, and DCI 2C.

After determining the subframes satisfying the conditions 1 and 2, if there are multiple DCIs in the subframe satisfying the condition 1 (i.e. there are multiple uplink subframes in the frame structure that can send uplink feedback, for example, in a carrier aggregation scenario), one DCI for performing dynamic frame structure indication needs to be selected according to one of the following conditions:

condition 1.1 judges the DCI to be detected first by User Equipment (UE) according to a Physical Downlink Control Channel (PDCCH) blind detection formula;

condition 1.2 is for scheduling DCI of a UE primary carrier;

condition 1.3 is for scheduling DCI for a UE-preset secondary carrier.

Or the method is not used for indicating the dynamic frame structure in a scene that a plurality of DCIs in a subframe may occur.

Table 2 redundant DAI information subframes

In a second method, the subframe is a subframe satisfying the following conditions 3 and 4:

the method comprises the following steps that (3) a subframe is a fixed downlink subframe X of any frame structure of frame structures 1-6;

conditional 4, the DCI format in the subframe is one of: DCI0, DCI 4.

A preferred implementation is to set the fixed downlink subframe X as subframe 5, and the Physical Uplink Shared Channel (PUSCH) scheduled by the DAI in the DCI in this subframe complies with the timing relationship of frame structure 6.

The reason subframe 5 is preferred is: in the existing frame structure (ul without considering frame structure 0) only frame structure 6 can transmit DAI in subframe 5 and it is only for one PDSCH, then if the UE detects DCI0 or DCI4 in subframe 5, it means that this DAI is redundant, i.e. it is not needed for other frame structures. In addition, if the system sends a DCI0 or DCI4 in subframe 5 for the UE, and then wants to update the parameters of DCI0 or DCI4, DCI0 or DCI4 may be sent in the following subframe, for example, subframe 6 or subframe 8, at which time DCI0 or DCI4 sent in the preceding subframe 5 is a redundant DCI and is only used for the dynamic frame structure indication. Or, it may be set that if the system sends a DCI0 or DCI4 in subframe 5 for the UE, it means that the system wishes to change the frame structure of the subsequent frame, and before receiving no UE acknowledgement, the system does not set DCI0 or DCI4 in any subframe of subframes 6 to 9, so as to avoid confusion of the UL subframe pointed by the subframe scheduled by DCI0 or DCI 4.

In a third method, the subframe is a subframe satisfying the following condition 5:

condition 5, the subframe shown in table 3 includes: the subframe is subframe 6 of frame structure 0, or subframe 5 of frame structure 1, or subframe 4 of frame structure 2, or subframe 1 of frame structure 3, or subframe 0 of frame structure 4, or subframe 9 of frame structure 5, or subframe 5 of frame structure 6;

if the subframe is determined by adopting the method, the response message sent by the UE can be conveniently received in the next subframe of the subframe, and the response message is a response aiming at the dynamic frame structure indication.

With the third method, frame structure confusion (frame structure of SIB configuration is mistakenly adopted) caused by that the UE cannot correctly demodulate the DCI can be avoided, because the uplink feedback of the subframe satisfying the condition 5 can be sent to the eNB earliest.

TABLE 3 subframes supporting fast feedback

Preferably, R12UE sends ACK or NACK acknowledgement for the dynamic frame structure indication in the second subframe as defined by R8, and the ACK or NACK feedback may be only for the DAI dynamic frame structure indication, that is, the ACK or NACK feedback for the DCI allocated PDSCH defined by eIMTA may occur in other uplink subframes.

For example, the SIB broadcast frame structure is 1, and the current frame UE1 is allocated downlink subframe 5 and subframe 9. The base station issues a dynamic frame structure indication (i.e., a subframe containing DCI and DAI) and PDSCH1 in subframe 5, where DCI and DAI are received correctly and PDSCH1 is received in error. The base station issues DCI and PDSCH 2 in subframe 9, and both the DCI and the PDSCH 2 are correctly received. The UE configures the next frame as frame structure 2 according to the DAI in subframe 5. In subframe 2 of the next frame, the UE feeds back ACK indicated by the dynamic frame structure issued for subframe 5 according to the R8 criterion, and subframe 7 feeds back NACK for PDSCH of subframes 5 and 9 according to R12.

Step 102, setting a Downlink Assignment Index (DAI) value in Downlink Control Information (DCI) in the subframe, where the DAI value is used for performing dynamic frame structure indication.

In a preferred embodiment, the DAI value in DCI in a subframe may be set in the following manner: setting the DAI value to indicate the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period. The frame structure indicated by the DAI value is the frame structure of the current frame or the next frame of the UE. For example, if the current SIB configures frame structure 0 and the candidate hopping set is [ 0126 ], the system may set the DAI value and the position of the subframe of the DAI according to frame structure 2, thereby avoiding confusion of the DAI value and solving the problem that the UE cannot correctly demodulate DCI, which may result in the fact that the subsequent frame structure cannot correctly demodulate. But the upstream feedback does not necessarily follow the frame structure.

In a better case, the frame structure transition candidate set comprises 4 or less frame structures, and the indication can be performed by using 2-bit DAI value. Meanwhile, some reasonable basic assumptions can be satisfied, such as "the number of candidate hopping subframe switching points remains unchanged" (candidate set is [ 0126 ], [3, 4, 5 ]) or "the SIB-defined downlink subframe cannot be hopped to the uplink subframe".

However, if the frame structure hopping candidate set includes 5 or more frame structures, the joint indication of the frame structure can be implemented in one of the following ways:

in the mode 1, combining the DAI value in DCI in 1 subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure with the position of the subframe, and jointly indicating the frame structure with the largest number of downlink subframes in a frame structure hopping candidate set in the current SIB period;

taking SIB configuration frame structure 0, and frame structure hopping candidate sets including frame structures 1-6 as examples, 2 hopping subsets can be defined and: subset 1: { 0126 }, subset 2: 345, each subset does not exceed 4 frame structures. The DAI values and the selection of subframes are shown in table 4.

TABLE 4DAI value and subframe Joint indication

One of the frame structures in the frame structure hopping candidate set is uniquely identified based on the selected subframe and the DAI value.

In the mode 2, the determined DAI values in DCI in a plurality of subframes which arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure are adopted to jointly indicate the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period.

For example, 2 subframes are selected, and a 4-bit dai joint indicator is used to uniquely identify one frame structure in the frame structure hopping candidate set. This approach requires two DAIs to be sent. For frame structure 5, it takes 20ms to traverse 7 frame structures, as shown in table 5.

TABLE 5 two DAI Joint indications

If according to table 3, R12UE can perform feedback completely according to the ACK or NACK feedback timing defined by R8, however, in order to support the scheme of jointly configuring 7 frame structures with multiple subframes, it is preferable to adopt frame structure 5, and simultaneously satisfy the requirements of ACK/NACK fast feedback and jointly configuring 7 candidate frame structures.

In another preferred embodiment, in addition to setting the DAI value in the subframe, the DAI value in the DCI in the downlink subframe other than the subframe may also be set, and the DAI values are used for DAI configuration. Specifically, the DAI value in the DCI in the downlink subframes other than the subframes may be set according to a frame structure in the current SIB period as a frame structure with the largest number of downlink subframes in the hopping candidate set, that is, assuming that the frame structure in the current SIB period is the frame structure with the largest number of downlink subframes in the hopping candidate set.

The dynamic frame structure configuration apparatus for implementing the above method, as shown in fig. 2, includes a frame structure determining module 201, a subframe determining module 202, and a configuration module 203, where:

the frame structure determining module 201 is configured to select a frame structure;

the subframe determining module 202 is configured to determine a subframe that reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure determined by the frame structure determining module, where the uplink feedback is used to indicate whether group data of the corresponding downlink subframes is received correctly or not;

the configuration module 203 is configured to set a DAI value in the DCI in the subframe, where the DAI value is used to perform a dynamic frame structure indication.

The frame structure determining module 201 may select the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period, or may also select the frame structure broadcasted by the SIB.

The subframe determining module 202 may determine, by using the first method, the second method, or the third method, a subframe that will arrive at the ue earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, where:

after the subframe determining module 202 determines the subframe by the first method, if there are a plurality of DCIs in the subframe satisfying the condition 1, the subframe determining module 202 is further configured to select the DCI according to the above condition 1.1, 1.2, or 1.3.

When the subframe determining module 202 determines a subframe by the method three, the apparatus further includes a receiving module 204, configured to receive, at a subframe next to the subframe, a response message for the dynamic frame structure indication sent by the UE.

In a preferred embodiment, the configuration module 203 sets the DAI value in the DCI in the subframe to a value indicating the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period.

In a preferred embodiment, the configuration module 203 is further configured to set a DAI value in DCI in a downlink subframe other than the subframe, where the DAI value is used for DAI configuration. The configuration module 203 may set the DAI value in the DCI in the downlink subframes other than the subframes according to the frame structure in the current SIB period being the frame structure with the largest number of downlink subframes in the hopping candidate set.

When the frame structure hopping candidate set includes 5 or more frame structures, the configuring module 203 is further configured to:

Example 2

The present embodiment introduces a TDD dynamic frame structure determining method, and the method of the present embodiment mainly aims at a UE side, as shown in fig. 3, and includes the following steps:

step 301, selecting a frame structure, and determining a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, where the uplink feedback is used to indicate whether the group data of the corresponding downlink subframes is received correctly or not;

the method for selecting the frame structure and the subframe in the frame structure at the UE side refer to the method at the base station side in embodiment 1, where:

after the frame structure is determined by the first method, if there are a plurality of DCIs in the subframe satisfying condition 1 (i.e. there are a plurality of uplink subframes in the frame structure that can send uplink feedback), obtaining the DAI value in the DCI in the subframe according to one of the following conditions:

judging DCI firstly detected by the UE according to a PDCCH blind detection formula, and acquiring a DAI value in the DCI; or

If the subframe is determined by adopting the condition 5 in the third method, the user equipment sends a response message for the dynamic frame structure indication in the next subframe of the subframe.

Step 302, receiving the subframe, and obtaining a DAI value in DCI in the subframe, where the DAI value is used for performing dynamic frame structure indication;

in a preferred embodiment, in addition to receiving the subframe, a downlink subframe other than the subframe is also received, and a DAI value in DCI in the downlink subframe other than the subframe is acquired, where the DAI value is used for DAI configuration.

Step 203, determining the frame structure of the current frame or the next frame according to the DAI value.

The frame structure of the current frame or the next frame may be determined specifically by one of the following ways:

mode 1, mainly aiming at the situation that a frame structure hopping candidate set includes 4 or 4 following frame structures, according to a DAI value in DCI in 1 subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structures, directly determining a frame structure indicated by the DAI value as a frame structure of a current frame or a next frame;

mode 2, mainly for the case that the frame structure hopping candidate set includes 5 or more than 5 frame structures, determining a frame structure indicated by a DAI value as a frame structure of a current frame or a next frame according to the combination of the DAI value in DCI in 1 subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure and the position of the subframe;

in a mode 3, mainly for a case that the frame structure transition candidate set includes 5 or more than 5 frame structures, a frame structure indicated by a DAI value is determined according to the DAI value in DCI in a plurality of subframes that will arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the determined frame structure, and the frame structure is used as a frame structure of a current frame or a next frame.

As shown in fig. 4, the dynamic frame structure determining apparatus for implementing the method includes a subframe determining module 401, a receiving module 402, and a dynamic frame structure determining module 403, where:

the subframe determining module 401 is configured to select a frame structure, and determine a subframe that will arrive at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, where the uplink feedback is used to indicate whether group data of corresponding downlink subframes is received correctly or not;

the receiving module 402 is configured to receive the subframe, and obtain a DAI value in DCI in the subframe, where the DAI value is used to perform a dynamic frame structure indication;

the dynamic frame structure determining module 403 determines the frame structure of the current frame or the next frame according to the DAI value.

The subframe determination module 401 may select the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period, or select the frame structure broadcasted by the SIB.

The subframe determining module 401 may select a subframe satisfying condition 1 and condition 2 in the first method of embodiment 1 as a subframe that reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure; at this time, after the subframe determining module 401 determines a subframe, if there are multiple DCIs in the subframe satisfying condition 1, the receiving module 402 determines the first detected DCI by the UE according to the PDCCH blind detection formula, and obtains the DAI value in the DCI; or determining DCI used for scheduling the UE main carrier, and acquiring a DAI value in the DCI; or determining DCI for scheduling UE preset auxiliary carrier, and acquiring DAI value in the DCI.

The subframe determining module 401 may further select a subframe satisfying the conditions 3 and 4 in the second method in embodiment 1 as a subframe that reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure.

The subframe determining module 401 may further select a subframe satisfying condition 5 in the third method of embodiment 1 as a subframe that will arrive at the ue earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, where the apparatus further includes a sending module, configured to send a response message for the dynamic frame structure indication in a subframe next to the subframe.

In a preferred embodiment, the receiving module 402 is further configured to receive a downlink subframe other than the subframe, and acquire a DAI value in DCI in the downlink subframe other than the subframe, where the DAI value is used for DAI configuration.

The dynamic frame structure determining module 403 may determine the frame structure of the current frame or the next frame by using the above-mentioned mode 1, mode 2, or mode 3 of this embodiment.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A Time Division Duplex (TDD) dynamic frame structure configuration method, comprising:

2. The method of claim 1, wherein:

selecting a frame structure comprising: and selecting the frame structure with the maximum number of downlink subframes in a frame structure hopping candidate set in the current System Information Block (SIB) period or the frame structure broadcasted by the SIB.

3. The method of claim 1, wherein:

the determining a subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure includes:

4. The method of claim 3, wherein:

after determining a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, when there are a plurality of DCIs in a subframe which meets a first condition, the method further includes: selecting DCI according to the following conditions, wherein DAI in the selected DCI is used for performing dynamic frame structure indication:

DCI for scheduling a UE primary carrier; or

And the DCI is used for scheduling the UE to preset the auxiliary carrier.

5. The method of claim 1, wherein:

6. The method of claim 5, wherein:

the fixed downlink subframe X is a subframe 5, and a Physical Uplink Shared Channel (PUSCH) scheduled by a DAI in DCI in the subframe complies with a timing relationship of a frame structure 6.

7. The method of claim 1, wherein:

the setting of the DAI value in the DCI in the subframe includes: and setting the DAI value to indicate the frame structure with the largest number of downlink subframes in the frame structure hopping candidate set in the current SIB period.

8. The method of claim 1, wherein:

the method further comprises the following steps: and setting the DAI value in the DCI in the downlink subframe except the subframe, wherein the DAI value is used for DAI configuration.

9. The method of claim 8, wherein:

the setting of the DAI value in the DCI in the downlink subframe other than the subframe includes:

10. The method of claim 7, wherein:

the frame structure hopping candidate set includes 4 or less frame structures.

11. The method of claim 7, wherein:

the frame structure hopping candidate set includes 5 or more frame structures, and the method further includes:

12. The method of claim 1, wherein:

the determining a group of subframes of the frame structure corresponding to the same uplink feedback, wherein the subframe which arrives at the user equipment earliest in the downlink subframes comprises: subframe 6 of frame structure 0, or subframe 5 of frame structure 1, or subframe 4 of frame structure 2, or subframe 1 of frame structure 3, or subframe 0 of frame structure 4, or subframe 9 of frame structure 5, or subframe 5 of frame structure 6;

13. A Time Division Duplex (TDD) dynamic frame structure determination method, comprising:

14. The method of claim 13, wherein:

15. The method of claim 13, wherein:

16. The method of claim 15, wherein:

after determining a subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, when there are a plurality of DCIs in a subframe which satisfies a first condition, the acquiring a DAI value in the DCI in the subframe includes:

17. The method of claim 13, wherein:

18. The method of claim 17, wherein:

the fixed downlink subframe X is subframe 5.

19. The method of claim 13, wherein:

the method further comprises the following steps: and receiving downlink subframes except the subframes, and acquiring DAI values in DCI in the downlink subframes except the subframes, wherein the DAI values are used for DAI configuration.

20. The method of claim 13, wherein:

the determining the frame structure of the current frame or the next frame according to the DAI value includes:

21. The method of claim 13, wherein:

22. A Time Division Duplex (TDD) dynamic frame structure configuration device comprises a frame structure determining module, a subframe determining module and a configuration module, wherein:

the frame structure determining module is used for selecting a frame structure;

23. The apparatus of claim 22, wherein:

the frame structure determination module selects a frame structure comprising:

24. The apparatus of claim 22, wherein:

the subframe determining module determines a subframe which arrives at the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback of the frame structure, and the subframe determining module comprises the following steps:

25. The apparatus of claim 24, wherein:

after determining the earliest subframe of a group of downlink subframes corresponding to the same uplink feedback in the frame structure to reach the user equipment, when there are a plurality of DCIs in a subframe satisfying the first condition, the subframe determining module is further configured to select the DCI according to the following conditions, and a DAI in the selected DCI is used for performing dynamic frame structure indication:

DCI for scheduling a UE primary carrier; or

And the DCI is used for scheduling the UE to preset the auxiliary carrier.

26. The apparatus of claim 22, wherein:

27. The apparatus of claim 26, wherein:

the fixed downlink subframe X is subframe 5.

28. The apparatus of claim 22, wherein:

the configuration module sets a DAI value in DCI in a subframe, including:

29. The apparatus of claim 22, wherein:

the configuration module is further configured to set a DAI value in DCI in a downlink subframe other than the subframe, where the DAI value is used for DAI configuration.

30. The apparatus of claim 29, wherein:

the configuration module sets the DAI value in the DCI in the downlink subframe except the subframe, and the method comprises the following steps:

31. The apparatus of claim 28, wherein:

the frame structure hopping candidate set includes 4 or less frame structures.

32. The apparatus of claim 28, wherein:

the frame structure hopping candidate set comprises 5 or more frame structures, and the configuration module is further configured to:

33. The apparatus of claim 22, wherein:

the subframe, which is determined by the subframe determination module and corresponds to the earliest subframe to the user equipment in a group of downlink subframes of the same uplink feedback, of the frame structure includes: subframe 6 of frame structure 0, or subframe 5 of frame structure 1, or subframe 4 of frame structure 2, or subframe 1 of frame structure 3, or subframe 0 of frame structure 4, or subframe 9 of frame structure 5, or subframe 5 of frame structure 6;

34. A Time Division Duplex (TDD) dynamic frame structure determining apparatus, comprising a subframe determining module, a receiving module, and a dynamic frame structure determining module, wherein:

35. The apparatus of claim 34, wherein:

the subframe determination module selects a frame structure comprising:

36. The apparatus of claim 34, wherein:

37. The apparatus of claim 36, wherein:

after the subframe determining module determines the subframe which reaches the user equipment earliest in a group of downlink subframes corresponding to the same uplink feedback in the frame structure, when there are a plurality of DCIs in a subframe which meets a first condition, the receiving module acquires a DAI value in the DCI in the subframe, including:

38. The apparatus of claim 34, wherein:

39. The apparatus of claim 38, wherein:

the subframe X is subframe 5.

40. The apparatus of claim 34, wherein:

the receiving module is further configured to receive a downlink subframe other than the subframe, and acquire a DAI value in DCI in the downlink subframe other than the subframe, where the DAI value is used for DAI configuration.

41. The apparatus of claim 34, wherein:

the dynamic frame structure determining module determines the frame structure of the current frame or the next frame according to the DAI value, and comprises the following steps:

42. The apparatus of claim 34, wherein: