WO2017167270A1

WO2017167270A1 - Method of monitoring control channel, method of reporting tti length, and device

Info

Publication number: WO2017167270A1
Application number: PCT/CN2017/078995
Authority: WO
Inventors: 陈冬雷; 夏树强; 谢峰; 游爱民
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-03-31
Filing date: 2017-03-31
Publication date: 2017-10-05
Also published as: CN107295614B; CN107295614A

Abstract

The invention provides a method of monitoring a control channel, a method of reporting a TTI length, and a device. The method of monitoring a control channel comprises: receiving information configured by a base station by means of a radio resource control (referred to as RRC) signaling and related to an available downlink transmission time interval (TTI) length, or receiving a media access control (MAC) control element (CE) transmitted by a base station and related to the available downlink TTI length; and monitoring, according to the information related to the available downlink TTI length or the MAC CE, a control channel. The invention resolves a problem of large power consumption owing to requiring monitoring a control channel for each symbol, and resulting in waste of resources in the prior art, and consequently, achieves the effect of reducing power consumption and preventing waste of resources.

Description

Control channel detection method, TTI length reporting method and device

Technical field

The present invention relates to the field of communications, and in particular to a control channel detection method, a TTI length reporting method, and a device.

Background technique

The Long-Term Evolution (LTE) mobile communication network has been researched by the 3rd Generation Partnership Project (3GPP) for data transmission. With the emergence of new applications with higher latency, such as virtual reality, real-time cloud computing, etc., new requirements are also put forward for LTE networks, such as reducing air interface transmission delay. Therefore, in the recent 3GPP conference, Ericsson proposed in the RAN2 (Radio Access Network) conference that it needs to research projects for air interface transmission. In the 3GPP RAN #67 conference, research items on reducing air interface transmission delay were adopted. In this study, it is pointed out that it is necessary to evaluate the performance gain caused by the length of the Transmission Time Interval (TTI), including the Orthogonal Frequency Division Multiplexing (OFDM). ) symbol, 2 OFDM symbols, 3 OFDM symbols, 4 OFDM symbols and 7 OFDM symbols.

In its proposal R1-160931, Ericsson proposes a method of transmitting data by using a dynamic TTI length method to adaptively cope with data in the terminal data buffer area, and the TTI length used by the terminal for each data scheduling is indicated by the control channel. However, the proposed method will bring about the problem that the terminal may need to perform control channel detection on each symbol, resulting in a relatively large power consumption of the terminal. Moreover, transmitting the TTI length indication value in each TTI also brings additional control channel overhead.

Therefore, in the related art, there is a problem that control channel detection needs to be performed on each symbol, resulting in a large power consumption and a waste of resources.

In view of the above problems, an effective solution has not been proposed in the related art.

Summary of the invention

The present invention provides a control channel detection method, a TTI length reporting method, and a device, to at least solve the problem that the control channel detection needs to be performed on each symbol in the related art, resulting in a large power consumption of the terminal, resulting in waste of resources. .

According to an aspect of the present invention, a method for detecting a control channel includes: receiving information related to a downlink available transmission time interval TTI length configured by a base station through radio resource control RRC signaling or a length of a downlink available TTI transmitted by a receiving base station a media access control control unit MAC (Media Access Control) control element; performs control channel detection according to the information related to the downlink available TTI length or the MAC control element.

Optionally, the MAC control element is used to indicate a length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbol numbers are Separately 0, 1, 2, ... 13.

Optionally, performing the control channel detection according to the information related to the downlink available TTI length or the MAC control element includes: determining the downlink according to the information related to a downlink available TTI length or the MAC control element The control channel detection may be performed according to the downlink available TTI length, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal.

Optionally, the multiple TTI lengths include one of 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols.

Optionally, when the downlink available TTI length includes 1 ms, performing the control channel detection according to the downlink available TTI length includes: according to the downlink available TTI length, the location number in the 1 ms subframe is 0, 1, A Physical Downlink Control Channel (PUCCH) detection is performed on one or more symbols in 2.

Optionally, when the downlink available TTI length includes one of four OFDM symbols, two OFDM symbols, four or three OFDM symbols, and seven OFDM symbols, according to the downlink available TTI length. Performing the control channel detection includes performing a short-physical downlink control channel (sPDCCH) detection on a specific symbol position in a 1 ms subframe according to the downlink available TTI length, where the sPDCCH is performed. Located within the length of the downlink available TTI.

Optionally, when the downlink available TTI length includes 4 or 3 OFDM symbols, performing the sPDCCH detection on a specific symbol position within a 1 ms subframe according to the downlink available TTI length includes: according to the sPDCCH Determining a length of a TTI for performing the sPDCCH detection from the 4 or 3 OFDM symbols, and performing the sPDCCH detection according to the determined length of the TTI.

Optionally, performing, according to the downlink available TTI length, the sPDCCH detection on a specific symbol position within a 1 ms subframe includes at least one of: when the downlink available TTI length includes 1 OFDM symbol, in a 1 ms subframe Performing the sPDCCH detection on one or more symbol positions in a physical downlink shared channel PDSCH region occupation symbol; when the downlink available TTI length includes 2 OFDM symbols, 0, 1, 2, 4 in a 1 ms subframe The sPDCCH detection is performed at one or more symbol positions of 6, 8, 8, 10, 12; when the downlink available TTI length includes 4 or 3 OFDM symbols, 0, 1, 2 in a 1 ms subframe The sPDCCH detection is performed at one or more symbol positions of 3, 4, 7, 10, 11; when the downlink available TTI length includes 7 symbols, 0, 1, 2, 7 in a 1 ms subframe The sPDCCH detection is performed at one or more symbol locations in the medium.

Optionally, receiving, according to the information about the downlink available TTI length configured by the base station by using the radio resource control RRC signaling, or receiving the MAC control related to the downlink available TTI length sent by the base station Before the element, the method further includes: reporting, to the base station, the shortest TTI length supported by the terminal, where the shortest TTI length supported by the terminal is used by the base station to determine the information related to the downlink available TTI length. Or the MAC control element.

Optionally, receiving, by the base station, the MAC control element related to the downlink available TTI length includes: receiving an indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, where The indication value is used to identify the MAC control element.

Optionally, the MAC PDU is located in a Physical Downlink Shared Channel (PDSCH) or a Short-Physical Downlink Shared Channel (sPDSCH), where the PDSCH or sPDSCH is located at the terminal. Within the currently available TTI length.

Optionally, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where k bits in the 8 bits are used to indicate one or more downlink available TTI lengths, and the remaining bits To reserve bits, 0<k<8.

Optionally, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes Radio Resource Controller (abbreviation) The shortest TTI length of the RRC) connection reconfiguration message; the MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

Optionally, after receiving the MAC control element sent by the base station and related to the downlink available TTI length, the method further includes: after the specific effective time after receiving the MAC control element, the terminal is currently The available TTI length is replaced by the downlink available TTI length indicated by the MAC control element.

Optionally, the RRC signaling includes an RRC connection reconfiguration message, where the information related to the downlink available TTI length is located in a dedicated radio resource configuration cell of the RRC connection reconfiguration message.

Optionally, the RRC connection reconfiguration message further includes: whether the validity information corresponding to the downlink available TTI length is used, where the validity information is used to indicate the information related to the downlink available TTI length. Whether the downlink available TTI length is valid.

Optionally, performing the control channel detection according to the information about the downlink available TTI length includes: when the validity information indicates that the downlink available TTI length indicated by the information related to the downlink available TTI length is valid, After the specific effective time, the currently available TTI length is switched to the downlink available TTI length indicated by the information related to the downlink available TTI length; and the control channel detection is performed according to the switched downlink available TTI length.

According to another aspect of the present invention, a method for reporting a transmission time interval TTI length is provided, including: reporting a shortest TTI length supported by a terminal to a base station, where the terminal supports two or more different TTI lengths.

Optionally, after reporting the shortest TTI length supported by the terminal to the base station, the method further includes: receiving information related to a downlink available TTI length configured by the base station by using radio resource control RRC signaling Or receiving, by the base station, a media access control control unit MAC control element related to a downlink available TTI length, where the information related to the downlink available TTI length or the MAC control element is the base station according to the shortest TTI length Determining; performing control channel detection according to the information related to the downlink available TTI length or the MAC control element.

Optionally, the MAC control element is used to indicate a length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbols are numbered. They are 0, 1, 2, ..., respectively.

Optionally, performing the control channel detection according to the information related to the downlink available TTI length or the MAC control element includes: determining the downlink according to the information related to a downlink available TTI length or the MAC control element The TTI length is available; the control channel detection is performed according to the downlink available TTI length, wherein the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal.

According to another aspect of the present invention, a method for receiving a MAC access element of a medium access control unit is provided, including: receiving a logical channel identifier (Identifier) located in a sub-header of a protocol data unit (PDU) The indication value of the ID) field, wherein the indication value is used to identify the MAC control element, and the MAC control element is related to a downlink available TTI length.

Optionally, the method further includes: performing control channel detection according to the MAC control element.

Optionally, the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, where the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.

Optionally, when the size of the MAC control element is 0, the following is one of the following: the downlink available TTI length indicated by the MAC control element is 1 ms; the downlink available TTI length indicated by the MAC control element is 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, one of 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes the shortest TTI in the RRC connection reconfiguration message Length; the MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

Optionally, the method further includes: replacing the currently available TTI length of the terminal with the downlink available TTI length indicated by the MAC control element after the specific effective time after receiving the MAC control element.

According to another aspect of the present invention, a control channel detection method is provided, including: configuring, by using radio resource control RRC signaling, information related to a downlink available transmission time interval TTI length to a terminal, or transmitting and downlinking to a terminal. A TMT length related media access control control unit MAC control element, wherein the information related to a downlink available TTI length or the MAC control element is used by the terminal for control channel detection.

Optionally, the MAC control element is used to indicate a length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbol numbers are They are 0, 1, 2, ..., respectively.

Optionally, the length of the downlink available transmission time interval TTI is compared by using the radio resource control RRC signaling Before the information is configured to the terminal, or before the MAC control element related to the downlink available TTI length is sent to the terminal, the method further includes: receiving the shortest supported by the terminal from the terminal TTI length information; determining the information related to the downlink available TTI length or the MAC control element according to the shortest TTI length information supported by the terminal.

Optionally, sending, to the terminal, the MAC control element related to the downlink available TTI length comprises: using the indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, the MAC control An element is sent to the terminal, wherein the indication value is used to identify the MAC control element.

Optionally, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, 7 OFDM symbols in one of four cases; the downlink available TTI length indicated by the MAC control element includes a radio resource control RRC connection reconfiguration message The shortest TTI length; the MAC control element is used by the terminal and the TTI currently available to the terminal to determine the downlink available TTI length of the terminal.

Optionally, the RRC connection reconfiguration message further includes: whether the validity information corresponding to the downlink available TTI length is used, where the validity information is used to indicate that the terminal is related to a downlink available TTI length. Whether the downlink available TTI length indicated by the information is valid.

According to another aspect of the present invention, a method for receiving a transmission time interval TTI length includes: receiving a shortest TTI length supported by the terminal reported by the terminal, wherein the terminal supports two or more different TTI lengths.

Optionally, after receiving the shortest TTI length supported by the terminal reported by the terminal, the method further includes: determining, according to the shortest TTI length, information related to a downlink available TTI length or related to a downlink available TTI length. a media control control unit MAC control element; configured to allocate, by the radio resource control RRC signaling, the information related to the downlink available TTI length to the terminal, or send the MAC control element to the terminal, where The information related to the downlink available TTI length or the MAC control element is used for the terminal to perform control channel detection.

According to another aspect of the present invention, a method for transmitting a MAC access element of a medium access control control unit is provided, comprising: passing a MAC control element by an indication value of a logical channel identification ID field located in a header of a MAC protocol data unit PDU Sending to the terminal, wherein the indication value is used to identify the MAC control element.

Optionally, the MAC control element is used by the terminal to perform control channel detection.

Optionally, the MAC PDU is located in a physical downlink shared channel, PDSCH or sPDSCH, where the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.

According to another aspect of the present invention, a control channel detecting apparatus is provided, including: a first receiving module, configured to receive information related to a length of a downlink available transmission time interval TTI configured by a base station through radio resource control RRC signaling, or receive a media access control control unit MAC control element sent by the base station and associated with a downlink available TTI length; the detecting module is configured to perform control channel detection according to the information related to the downlink available TTI length or the MAC control element.

According to another aspect of the present invention, a reporting apparatus for transmitting a time interval TTI is provided, including: a reporting module, configured to report a shortest TTI length supported by the terminal to a base station, where the terminal supports two or more different types. TTI length.

According to another aspect of the present invention, a medium access control control unit MAC control element receiving apparatus includes: a second receiving module configured to receive a logical channel identification ID field located in a MAC protocol data unit PDU subheader An indication value, wherein the indication value is used to identify the MAC control element, the MAC control element being related to a downlink available TTI length.

According to another aspect of the present invention, a control channel detecting apparatus is provided, including: a processing module configured to: configure, by a radio resource control RRC signaling, information related to a downlink available transmission time interval TTI length to a terminal, or The terminal sends a media access control control unit MAC control element related to the downlink available TTI length, wherein the information related to the downlink available TTI length or the MAC control element is used by the terminal to perform control channel detection.

According to another aspect of the present invention, a receiving apparatus for transmitting a time interval TTI is provided, including: a third receiving module, configured to receive a shortest TTI length supported by the terminal reported by the terminal, where the terminal supports two Species Different TTI lengths.

According to another aspect of the present invention, a medium access control control unit MAC control element transmitting apparatus is provided, including: a sending module, configured to indicate an indication value of an ID field through a logical channel located in a MAC protocol data unit PDU subheader Sending a MAC control element to the terminal, where the indication value is used to identify the MAC control element.

According to still another embodiment of the present invention, there is also provided a storage medium comprising a stored program, wherein the program is executed to perform the method of any of the above.

According to still another embodiment of the present invention, there is also provided a processor for running a program, wherein the program is executed to perform the method of any of the above.

Through the present invention, the information related to the downlink available TTI length determined by the base station or the MAC control element related to the downlink available TTI length is used, thereby ensuring the downlink available TTI length related information determined by the base station, or the MAC control element is controlled. Channel detection, which can reduce unnecessary control channel detection times, save power consumption, and avoid waste of resources. The invention has solved the problem that the control channel detection needs to be performed on each symbol, which causes a large power consumption and wastes resources, thereby achieving the effect of saving power consumption and avoiding resource waste.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flowchart of a first control channel detection method according to an embodiment of the present invention;

2 is a flowchart of a reporting method of a transmission time interval TTI length according to an embodiment of the present invention;

3 is a flowchart of a MAC control element receiving method according to an embodiment of the present invention;

4 is a flowchart of a second method for detecting a control channel according to an embodiment of the present invention;

FIG. 5 is a flowchart of a receiving method of a transmission time interval TTI length according to an embodiment of the present invention; FIG.

6 is a flowchart of a method for transmitting a MAC control element according to an embodiment of the present invention;

7 is a first schematic diagram 1 of a level of downlink support TTI length capability applied to a base station and a terminal in an LTE system supporting shorter TTI transmission according to an embodiment of the present invention;

FIG. 8 is a second schematic diagram of a level of downlink support TTI length capability applied to a base station and a terminal in an LTE system supporting shorter TTI transmission according to an embodiment of the present invention; FIG.

9 is a schematic diagram of an LTE communication system supporting transmission in a shorter TTI, in accordance with an embodiment of the present invention;

10 is a first schematic diagram of control channel detection for downlink available TTI length according to an embodiment of the present invention;

11 is a second schematic diagram of control channel detection for downlink available TTI length according to an embodiment of the present invention;

12 is a schematic diagram of a logical channel ID field indication value of a MAC control element for indicating a TTI length information available to a terminal in a MAC PDU subheader according to an embodiment of the present invention;

FIG. 13 is a schematic diagram showing the structure of a MAC control element for indicating TTI length information available to a terminal according to an embodiment of the present invention; FIG.

FIG. 14 is a structural block diagram of a first control channel detecting apparatus according to an embodiment of the present invention; FIG.

15 is a structural block diagram of a TTI length reporting apparatus according to an embodiment of the present invention;

16 is a structural block diagram of a MAC control element receiving apparatus according to an embodiment of the present invention;

17 is a block diagram showing the structure of a second control channel detecting apparatus according to an embodiment of the present invention;

FIG. 18 is a structural block diagram of a TTI length receiving apparatus according to an embodiment of the present invention; FIG.

FIG. 19 is a structural block diagram of a MAC control element transmitting apparatus according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In this embodiment, a control channel detection method is provided. FIG. 1 is a flowchart of a first control channel detection method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102: Receive information related to the length of the downlink available transmission time interval TTI configured by the base station by using a Radio Resource Controller (RRC) signaling, or media access control control related to the downlink available TTI length sent by the receiving base station. Unit MAC control element;

Step S104: Perform control channel detection according to the information related to the downlink available TTI length or the MAC control element.

Wherein, the above operation may be performed by the terminal.

Through the foregoing steps, the information related to the downlink available TTI length determined by the base station, or the MAC control element related to the downlink available TTI length, is used, so as to ensure that the terminal can determine the information related to the downlink available TTI length determined by the base station, or MAC. The control element performs control channel detection, thereby reducing unnecessary control channel detection times, saving power consumption of the terminal, and avoiding waste of resources. The invention has solved the problem that the control channel detection needs to be performed on each symbol, which causes a large power consumption and wastes resources, thereby achieving the effect of saving power consumption and avoiding resource waste.

In an optional embodiment, the MAC control element is used to indicate the length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbols The numbers are 0, 1, 2, ... 13, respectively. It can be seen from the above embodiments that, in order to solve the problem that the control channel detection needs to be performed on each symbol in the related art, causing a large power consumption and causing waste of resources, the semi-static method is used to configure the TTI length supported by the terminal. A more reasonable method is to configure the TTI length of the terminal in a semi-static manner according to the service delay requirement. According to the configured TTI length, the terminal determines that the symbol position of the control channel needs to be detected, thereby reducing the detection of the control channel. When the terminal uses a shorter TTI length for data reception, the control channel overhead will also increase due to the shorter TTI length. Therefore, considering the trade-off between delay and overhead, for services with lower latency requirements, The base station can configure it for longer or even 1 ms TTI for data reception to reduce control channel transmission overhead. Therefore, the terminal can obtain the downlink available TTI length information configured by the base station, and perform control channel detection on the specific symbol in the 1 ms subframe based on the information, thereby reducing the number of detections of the terminal, thereby achieving the purpose of saving power consumption.

In an optional embodiment, performing control channel detection according to the foregoing information related to the downlink available TTI length or the MAC control element includes: determining a downlink available TTI length according to the foregoing information related to a downlink available TTI length or a MAC control element; The downlink available TTI length is used for control channel detection, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal. That is, when the control channel is detected according to the information related to the downlink available TTI length or the MAC control element, the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element may be more than two supported by the terminal. Determining one or more TTI lengths in the TTI length, where the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element is one or more of two or more TTI lengths supported by the terminal; according to the determined TTI The length is used for control channel detection. In this embodiment, the downlink may be TTI length related information may indicate one or more TTI lengths, and the MAC control element may indicate one or more TTI lengths.

In an optional embodiment, the multiple TTI lengths include one of 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols. In the example, the plurality of TTI lengths may be two TTI lengths, and one of the two TTI lengths is 1 ms in length, and the other one is one of the above four lengths.

In an optional embodiment, when the downlink available TTI length includes 1 ms, the control channel detection is performed according to the downlink available TTI length, that is, the control channel detection according to the information related to the downlink available TTI length or the MAC control element includes: The physical uplink control channel PUCCH detection is performed on one or more of the 0, 1, and 2 positions of the downlink available TTI length in the 1 ms subframe.

In an optional embodiment, when the downlink available TTI length includes one of four OFDM symbols, two OFDM symbols, four or three OFDM symbols, and seven OFDM symbols, according to the foregoing downlink The control channel detection by using the TTI length includes: performing sPDCCH (short-PDCCH, short physical downlink control channel) detection on a specific symbol position in a 1 ms subframe according to the downlink available TTI length, where the sPDCCH is located in the downlink available TTI Within the length.

In an optional embodiment, when the downlink available TTI length includes 4 or 3 OFDM symbols, performing sPDCCH detection on a specific symbol position within a 1 ms subframe according to the downlink available TTI length includes: The sPDCCH determines the length of the TTI for performing sPDCCH detection from the 4 or 3 OFDM symbols at a position within the downlink available TTI length; and performs sPDCCH detection according to the determined length of the TTI.

In an optional embodiment, performing sPDCCH detection on a specific symbol position within a 1 ms subframe according to the downlink available TTI length includes at least one of the following: when the downlink available TTI length includes 1 OFDM symbol, in a 1 ms subframe Performing the sPDCCH detection on one or more symbol positions in a physical downlink shared channel PDSCH region occupation symbol; when the downlink available TTI length includes 2 OFDM symbols, 0, 1, 2, 4, 6 in a 1 ms subframe sPDCCH detection is performed at one or more symbol positions of 8, 10, 12; when the downlink available TTI length includes 4 or 3 OFDM symbols, 0, 1, 2, 3, 4, 7 in a 1 ms subframe The sPDCCH detection is performed at one or more symbol positions in 10, 11; when the downlink available TTI length includes 7 symbols, one or more symbol positions in 0, 1, 2, 7 within a 1 ms subframe Perform sPDCCH detection on it.

In an optional embodiment, receiving, by the base station, information related to a downlink available TTI length configured by radio resource control RRC signaling or a media access control control unit MAC control related to a downlink available TTI length sent by the receiving base station Before the element, the method further includes: reporting the shortest TTI length supported by the terminal to the base station, where the shortest TTI length supported by the terminal is used by the base station to determine the information or the MAC control element related to the downlink available TTI length. In this embodiment, the terminal can report the shortest TTI length of the downlink by using the capability report message UE Capability Information, and the terminal can support M types of TTIs of different lengths, where M>1, and the range of the TTI length is less than or equal to 1 ms. The M TTI length includes a 1 ms TTI, where the shortest TTI length is the minimum value of the M TTI lengths supported by the terminal.

In an optional embodiment, receiving, by the base station, a MAC control element related to a downlink available TTI length includes: receiving an indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, where the indication The value is used to identify the MAC control element. In this embodiment, for a terminal that supports downlink TTI data reception, when the base station configures multiple downlink available TTI lengths for the terminal, the base station may adopt the MAC control element to adopt the downlink control according to the current service requirement for the delay. The TTI length is switched.

In an optional embodiment, the MAC PDU is located in a physical downlink shared channel (PDSCH) or sPDSCH (short-PDSCH), and the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.

In an optional embodiment, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where the k bit in the 8 bits is used to indicate one or more downlink available TTI lengths, and the remaining The bits (ie, the remaining (8-k) bits) are reserved bits, 0 < k < 8.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms. And one of OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes a radio resource control RRC connection reconfiguration message The shortest TTI length; the MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

In an optional embodiment, after receiving the media access control unit MAC control element sent by the base station and related to the downlink available TTI length, the method further includes: a specific effective time after receiving the MAC control element. The TTI length currently available to the terminal is replaced by the downlink available TTI length indicated by the MAC control element.

In an optional embodiment, the foregoing RRC signaling includes an RRC connection reconfiguration message, where the information related to the downlink available TTI length is located in a dedicated radio resource configuration cell of the RRC connection reconfiguration message.

In an optional embodiment, the foregoing RRC connection reconfiguration message further includes: whether the validity information corresponding to the downlink available TTI length is used, where the validity information is used to indicate the foregoing information related to the downlink available TTI length. Whether the downlink available TTI length is valid.

In an optional embodiment, performing control channel detection according to the information related to the downlink available TTI length includes: when the validity information indicated by the information related to the downlink available TTI length is valid, the downlink available TTI length is valid, After the effective time, the currently available TTI length is switched to the downlink available TTI length indicated by the information related to the downlink available TTI length, and the control channel detection is performed according to the switched downlink available TTI length.

At present, a large number of LTE networks are commercially available. In the research item for reducing the air interface transmission delay, backward compatibility is required, that is, after upgrading the existing LTE commercial network to support a terminal with a shorter TTI length, the terminal does not affect. Old LTE terminals enter the network. However, the shorter TTI length puts higher demands on the processing power of the base station. Some deployed base stations have limited ability to support shorter TTIs due to poor processing capabilities, ie, for some TTI lengths, deployed base stations cannot support them. Similarly, the shorter TTI length puts higher demands on the processing power of the terminal, and the cost of the terminal with different processing capabilities will also be different. In this embodiment, a terminal that supports downlink shorter TTI length data reception, such as two OFDM symbols, can handle three OFDM symbol TTI data reception when considering the processing capability of the terminal. The reception of 4 or 7 OFDM data, therefore, when the terminal reports the TTI supporting the downlink 2 OFDM symbols, it should also support the reception of 3 OFDM symbols, 4 OFDM symbols and 7 OFDM symbols short TTI data by default. In this way, when the base station cannot support the transmission of two OFDM symbols, the terminal can use three, four or seven OFDM symbols for data transmission, thereby satisfying some services with low delay requirements. If the terminal reports that the downlink supports the TTI of 2 OFDM symbols, and the terminal only supports the TTI data processing of 2 OFDM symbols, this will result in the terminal only receiving 1 ms TTI data reception when the base station does not support 2 OFDM symbol length TTIs. As a result, the terminal cannot process some services with low delay requirements. For example, 3, 4, or 7 OFDM lengths can reduce the air interface processing delay, and the processing capability originally possessed by the terminal cannot be applied, resulting in waste. In addition, the shortest TTI length supported by the terminal is different, and the cost to the terminal is also different. Some terminals do not need to have the ability to process 1 or 2 OFDM symbol length TTIs according to the usage scenario, that is, there is no corresponding application. At this time, the terminal's ability to support the shortest TTI can be lowered, thereby reducing the terminal cost. Since different downlink shortest TTI length support capabilities have different cost to the terminal, some end users may also choose a downlink shortest TTI processing capability that is not required for cost considerations. In addition, since the downlink shortest TTI processing capability available to the terminal is also supported by the base station's support for the TTI processing capability, terminals requiring lower downlink minimum TTI processing capability will also exist, for example, the downlink minimum TTI support capability is 4 or 7. OFDM symbols.

In the embodiment of the present invention, a reporting method for the transmission time interval TTI length is also provided, and FIG. 2 is provided. A flowchart of a method for reporting a transmission time interval TTI length according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202: Report the shortest TTI length supported by the terminal to the base station, where the terminal supports two or more different TTI lengths.

The foregoing operations may be performed by the terminal, and the terminal may report the shortest TTI length supported by the terminal to the base station, so that the base station can determine a more reasonable downlink available TTI length related information or MAC according to the shortest TTI length supported by the terminal. Control element.

In an optional embodiment, after reporting the shortest TTI length supported by the terminal to the base station, the method further includes: receiving, by the base station, information related to the downlink available TTI length configured by the radio resource control RRC signaling, or receiving a medium access control control unit MAC control element related to a downlink available TTI length sent by the base station, where the information or MAC control element related to the downlink available TTI length is determined by the base station according to the minimum TTI length; TTI length related information or MAC control element performs control channel detection. In this embodiment, the information about the downlink available TTI length determined by the base station or the MAC control element related to the downlink available TTI length is used, so as to ensure that the terminal can determine the information related to the downlink available TTI length determined by the base station, or The MAC control element performs control channel detection, thereby reducing unnecessary control channel detection times, saving power consumption of the terminal, and avoiding waste of resources. The invention has solved the problem that the control channel detection needs to be performed on each symbol, which causes a large power consumption and wastes resources, thereby achieving the effect of saving power consumption and avoiding resource waste.

In an optional embodiment, the MAC control element is used to indicate the length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbol numbers are They are 0, 1, 2, ..., respectively.

In an optional embodiment, performing control channel detection according to the foregoing information related to the downlink available TTI length or the MAC control element includes: determining a downlink available TTI length according to the foregoing information related to a downlink available TTI length or a MAC control element; The downlink available TTI length is used for control channel detection, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal. That is, one or more TTI lengths may be determined from two or more TTI lengths supported by the terminal according to the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element, where the downlink available TTI length is related. The downlink available TTI length indicated by the information or MAC control element is one or more of two or more TTI lengths supported by the foregoing terminal; and the foregoing control channel detection is performed according to the determined TTI length.

In an optional embodiment, when the downlink available TTI length includes 1 ms, performing control channel detection according to the downlink available TTI length includes: according to the downlink available TTI length, the location number in the 1 ms subframe is 0, 1, Physical uplink control channel PUCCH detection is performed on one or more symbols in 2.

In an optional embodiment, when the downlink available TTI length includes one of four OFDM symbols, two OFDM symbols, four or three OFDM symbols, and seven OFDM symbols, according to the foregoing downlink The control channel detection by using the TTI length includes: advancing in a specific symbol position within a 1 ms subframe according to the downlink available TTI length. The sPDCCH is detected, where the sPDCCH is located in the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element.

In an optional embodiment, when the downlink available TTI length includes 4 or 3 OFDM symbols, performing sPDCCH detection according to the downlink available TTI length includes: according to the location of the sPDCCH in the downlink available TTI length, from 4 The length of the TTI for which sPDCCH detection is performed is determined among the 3 or OFDM symbols; sPDCCH detection is performed according to the determined length of the TTI.

In an optional embodiment, performing sPDCCH detection on a specific symbol position within a 1 ms subframe according to the downlink available TTI length includes at least one of the following: when the downlink available TTI length includes 1 OFDM symbol, in 1 ms. sPDCCH detection is performed on one or more symbol positions in the intra-physical downlink shared channel PDSCH region occupation symbol; when the downlink available TTI length includes 2 OFDM symbols, 0, 1, 2, 4, 6, in the 1 ms subframe, sPDCCH detection is performed at one or more symbol positions in 8, 10, 12; when the downlink available TTI length includes 4 or 3 OFDM symbols, 0, 1, 2, 3, 4, 7, in a 1 ms subframe, sPDCCH detection is performed at one or more symbol positions in 10, 11; when the downlink available TTI length includes 7 symbols, sPDCCH is performed on one or more symbol positions in 0, 1, 2, 7 within 1 ms subframe Detection.

In an optional embodiment, receiving, by the base station, a media access control unit (MAC control element) related to a downlink available TTI length includes: receiving an indication of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader a value, wherein the indication value is used to identify the MAC control element described above.

In an optional embodiment, the foregoing MAC PDU is located in a physical downlink shared channel, PDSCH or sPDSCH, where the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.

In an optional embodiment, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where the k bit in the 8 bits is used to indicate one or more downlink available TTI lengths, and the remaining The bit is reserved, 0<k<8.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; the downlink available TTI length indicated by the MAC control element includes 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, one of 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes the shortest TTI length in the RRC connection reconfiguration message The MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

In an optional embodiment, after receiving the media access control unit MAC control element related to the downlink available TTI length sent by the base station, the method further includes: a specific effective time after receiving the MAC control element The TTI length currently available to the terminal is replaced by the downlink available TTI length indicated by the MAC control element.

In an optional embodiment, performing control channel detection according to the information related to the downlink available TTI length includes: when the validity information indicated by the information related to the downlink available TTI length is valid, the downlink available TTI length is valid, After the effective time, the TTI length currently available to the terminal is switched to the downlink available TTI length indicated by the information related to the downlink available TTI length; and the control channel detection is performed according to the downlink available TTI length after the handover.

In this embodiment, a MAC control element receiving method is provided. FIG. 3 is a flowchart of a MAC control element receiving method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step S302: Receive an indication value of a logical channel identifier ID field located in a header of a MAC protocol data unit PDU, where the indication value is used to identify a MAC control element, and the MAC control element is related to a downlink available TTI length.

Wherein, the above operation may be performed by the terminal.

In this embodiment, for a terminal that supports downlink TTI data reception, when the base station configures multiple downlink available TTI lengths for the terminal, the base station may adopt the MAC control element to adopt the downlink control according to the current service requirement for the delay. The TTI length is switched.

In an optional embodiment, the method further includes: performing control channel detection according to the MAC control element. In this embodiment, the MAC control element related to the downlink available TTI length is determined by the base station, so that the terminal can perform control channel detection according to the MAC control element determined by the base station, thereby reducing unnecessary control channel detection times and saving the terminal. The power consumption, to avoid waste of resources. The invention has solved the problem that the control channel detection needs to be performed on each symbol, which causes a large power consumption and wastes resources, thereby achieving the effect of saving power consumption and avoiding resource waste.

In an optional embodiment, the MAC PDU is located in a physical downlink shared channel, PDSCH or sPDSCH, and the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms. And 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and one of 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes the shortest of the RRC connection reconfiguration messages. The length of the TTI; the MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

In an optional embodiment, the method further includes: replacing the currently available TTI length of the terminal with the downlink available TTI length indicated by the MAC control element after the specific effective time after receiving the MAC control element.

A control channel detection method is also provided in this embodiment. FIG. 4 is a flowchart of a second control channel detection method according to an embodiment of the present invention. As shown in FIG. 4, the process includes the following steps:

In step S402, the information related to the length of the downlink available transmission time interval TTI is configured to the terminal by using the radio resource control RRC signaling, or the medium access control control unit MAC control element related to the downlink available TTI length is sent to the terminal, where The information or MAC control element related to the downlink available TTI length is used for the above terminal to perform control channel detection.

Wherein, the above operation may be performed by a base station.

In an optional embodiment, the MAC control element is used to indicate the length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbols are The numbers are 0, 1, 2, ..., respectively.

In an optional embodiment, the information related to the downlink available transmission time interval TTI length is configured to the terminal by using the foregoing RRC signaling, or the medium related to the downlink available TTI length is sent to the terminal. Before the access control unit MAC control element, the method further includes: receiving shortest TTI length information supported by the terminal from the terminal; determining information related to the downlink available TTI length or MAC control element according to the shortest TTI length information supported by the terminal. .

In an optional embodiment, sending, to the terminal, a media access control control unit MAC control element related to a downlink available TTI length includes: indicating, by using a logical channel identifier ID field located in a MAC protocol data unit PDU subheader Sending the MAC control element to the terminal, where the indication value is used to identify the MAC control element.

In an optional embodiment, when the size of the MAC control element is 0, one of the following is included: MAC The downlink available TTI length indicated by the control element is 1 ms; the downlink available TTI length indicated by the MAC control element includes 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols in four cases. The downlink available TTI length indicated by the MAC control element includes the shortest TTI length in the RRC connection reconfiguration message; the MAC control element is used by the terminal and the currently available TTI of the terminal to determine the downlink available TTI length of the terminal.

In an optional embodiment, the foregoing RRC connection reconfiguration message further includes: whether the validity information corresponding to the downlink available TTI length is used, where the validity information is used to indicate that the terminal is related to the downlink available TTI length. Whether the downlink available TTI length is valid.

In the embodiment of the present invention, a method for receiving a transmission time interval TTI length is further provided. FIG. 5 is a flowchart of a method for receiving a transmission time interval TTI length according to an embodiment of the present invention. As shown in FIG. 5, the process includes The following steps:

Step S502: Receive a shortest TTI length supported by the terminal reported by the terminal, where the terminal supports two or more different TTI lengths.

The foregoing operation may be performed by the base station. The shortest TTI length supported by the terminal may be obtained through the foregoing steps, so that a more reasonable downlink available TTI length related information or a MAC control element may be determined according to the minimum TTI length.

In an optional embodiment, after receiving the shortest TTI length supported by the terminal reported by the terminal, the method further includes: determining, according to the shortest TTI length, information related to a downlink available TTI length or related to a downlink available TTI length. a media control control unit (MAC control element) configured to allocate, by the radio resource control RRC signaling, information related to the downlink available TTI length to the terminal, or to send the MAC control element to the terminal, where the length is related to the downlink available TTI length. The information or MAC control element is used for the above terminal to perform control channel detection.

In an optional embodiment, the MAC control element is used to indicate the length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbols are included. The numbers are 0, 1, 2, ..., respectively.

In an optional embodiment, sending the MAC control element to the terminal includes: sending, by using an indication value of a logical channel identifier ID field located in a header of the MAC protocol data unit PDU, the MAC control element to the terminal, where The indication value is used to identify the MAC control element described above.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms. And 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and one of 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes the shortest of the RRC connection reconfiguration messages. TTI length; the above MAC control element is used by the terminal and the currently available TTI of the terminal to determine the downlink available TTI length of the terminal.

In an optional embodiment, the foregoing RRC signaling includes an RRC connection reconfiguration message, and the information related to the downlink available TTI length is located in a dedicated radio resource configuration cell of the RRC connection reconfiguration message.

In an optional embodiment, the foregoing RRC connection re-configuration message further includes information about whether the downlink effective TTI length is valid, where the validity information is used to indicate that the terminal is related to the downlink available TTI length. Indicates whether the downlink available TTI length is valid.

In the embodiment of the present invention, a MAC access element sending method is also provided. FIG. 6 is a flowchart of a MAC control element sending method according to an embodiment of the present invention. Including the following steps:

Step S606: Send the MAC control element to the terminal by using an indication value of the logical channel identifier ID field located in the MAC protocol data unit PDU subheader, where the indication value is used to identify the MAC control element.

Wherein, the above operation may be performed by a base station.

In an optional embodiment, the MAC control element is used by the terminal for control channel detection.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms. And 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and one of 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes the shortest of the RRC connection reconfiguration messages. TTI length; the MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

The present invention will be described below in conjunction with specific embodiments:

A schematic diagram of a level table supporting base station and terminal downlink support TTI length capabilities in an LTE system with shorter TTI transmission is shown in FIG. The ability of the base station and the terminal to support the downlink TTI length in the LTE system is divided into four levels in FIG. Each higher level has a shorter downlink TTI support capability than the next lower level. For example, the level L4 is compared with the L3, and the TTI length of the downlink 1 OFDM symbol is increased, and the level L3 is compared with the level L2. Two OFDM symbol processing capabilities have been added, and level L2 has increased by 4 or 3 OFDM symbol processing capabilities compared to level L1.

Another schematic diagram of a rating table for base station and terminal downlink support TTI length capabilities in an LTE system supporting shorter TTI transmissions is shown in FIG. In Figure 8, the support capability of the base station and the terminal for the downlink TTI length in the LTE system is divided into three levels. Each higher level adds a shorter downlink TTI support capability than the next lower level. For example, level L3 adds 2 OFDM symbol processing capabilities compared to level L2, and level L2 increases compared to level L1. 4 or 3 OFDM symbol processing capabilities.

9 is an LTE communication system given in conjunction with the TTI length capability level table supported by the base station and the terminal in FIG. In FIG. 9, UE1 supports the shortest TTI of the downlink 2 OFDM symbols, that is, L3 in FIG. 7, and when the terminal reports the downlink minimum support TTI length of 2 OFDM symbols, it means that the terminal downlink also supports 4 Or 3 OFDM symbols, 7 symbols, and 1 ms TTI length, UE2 supports the shortest TTI of the downlink 7 OFDM symbols, that is, the lowest level L1 in FIG. 7, and the terminal supports the TIM length of 7 OFDM symbols in the downlink of the level 1 At the time, the terminal downlink also supports 1ms TTI.

In FIG. 9, the base station downlink supports the shortest TTI of 4 or 3 OFDM symbols. For the terminal UE1, the base station configures the downlink available TTI length including 4 or 3 by using the dedicated radio resource configuration information in the RRC connection reconfiguration message. OFDM symbol, such that UE1 will perform sPDCCH control channel detection on one or more of the 0, 1, 2, 3, 4, 7, 10, 11 position numbers in the 1 ms subframe, wherein the downlink described above is available. The TTI length includes 4 or 3 OFDM symbols, indicating that the terminal can receive 4 or 3 OFDM symbol TTI length data, and the terminal determines, according to the symbol position of the sPDCCH in the 1 ms subframe, that the TTI length is 4 or 3 OFDM symbols. For example, the sPDCCH detected on the symbol position 0, 1, 2 has a TTI length of 4, and the sPDCCH detected at the symbol position 4 has a TTI length of 3. As shown in Figure 10.

For the terminal UE2, the base station configures the downlink available TTI length by using the dedicated radio resource configuration information in the RRC connection reconfiguration message to include 7 OFDM symbols, so that the UE2 will be numbered in the 1ms subframe as 0, 1, 2, 7 The sPDCCH control channel detection is performed on one or more symbols, as shown in FIG.

Similarly, for an LTE system supporting transmission in a shorter TTI, if the terminal is configured by the RRC connection reconfiguration message to have a downlink available TTI length including 1 OFDM symbol, the terminal will occupy the downlink PDSCH data channel region in the 1 ms subframe. sPDCCH control channel detection is performed on one or more symbols in the symbol, if the terminal is configured to use the RRC connection reconfiguration message to configure the downlink available TTI length to include 2 OFDM symbols, such that the terminal will be numbered 0, 1 in the 1 ms subframe. sPDCCH control channel detection is performed on one or more symbols of 2, 4, 6, 8, 10, 12.

In addition, when the terminal is reconfigured to receive the 1 ms TTI from the downlink using the 7 OFDM symbol TTI length, the terminal performs the PDCCH on the one or more symbols in the position number of 0, 1, 2 in the 1 ms subframe. Control channel detection.

There is also a case in the embodiment of the present invention. As shown in FIG. 9, the base station downlink supports the shortest TTI of 4 or 3 OFDM symbols. For the terminal UE1, the base station uses the dedicated radio resource configuration information in the RRC connection reconfiguration message. The element is configured with a downlink available TTI length including 4 or 3 OFDM symbols and 7 OFDM symbols. In this way, the base station can indicate which downlink available TTI length takes effect by using the MAC control element according to the needs of the service. Similarly, for the terminal UE2, the base station configures the downlink available TTI length by using the dedicated radio resource configuration information in the RRC connection reconfiguration message to include 7 OFDM symbols, and the base station can indicate the downlink 7 by using the MAC control element according to the needs of the service. Whether the OFDM available TTI length is valid.

A schematic diagram of a logical channel domain indication value at the MAC PDU subheader of a MAC control element indicating a downlink available TTI length is shown in FIG. Assume that the size of the MAC control element is 0. The TTI switch command in Figure 12 can be used to switch the UE2 from 1 ms TTI to 7 OFDM symbols TTI, or from 7 OFDM symbols TTI to 1 ms TTI. A terminal with a short TTI length can be switched between a short TTI length and a 1 ms TTI length by using a TTI switch command. If the terminal is currently available with a short TTI length, after receiving the TTI switch command, the terminal will switch to the downlink. Supporting 1ms TTI, if the currently available TTI length of the terminal is 1ms TTI, after receiving the TTI switch command, the terminal will switch to downlink support short TTI. For a terminal that supports multiple short TTIs in the downlink, the following method may be adopted, that is, regardless of the TTI length used in the current downlink, after receiving the TTI switch command, it will switch to the 1 ms TTI.

A schematic diagram of a configuration of a MAC control element for indicating TTI length related information for a terminal is shown in FIG. The MAC control element is composed of 8 bits, wherein 4 bits are used to indicate the available TTI length of the terminal (the 4 bits listed here are only a preferred manner, and other lengths may be used to indicate the available TTI length of the terminal, for example, using a 2 bit indication. Or use 6bit indication), the remaining 4bits are reserved bits.

There is also a case in the embodiment of the present invention. As shown in FIG. 9, the base station downlink supports the shortest TTI of 4 or 3 OFDM symbols. For the terminal UE1, the base station uses the dedicated radio resource configuration information in the RRC connection reconfiguration message. The downlink configured TTI length includes 4 or 3 OFDM symbols and 7 OFDM symbols. Since the current service does not need to be configured, the available TTI lengths are not valid. When the service requires a lower air interface, the delay is delayed. It can be re-allocated to make certain TTI lengths take effect.

It should be noted that the method in the foregoing embodiments is described by taking the configuration of the downlink available TTI length of the terminal as an example. The methods in the foregoing embodiments may also be applied to the configuration of the uplink available TTI length of the terminal. .

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

Also provided in the embodiment is a control channel detecting device, a reporting device for transmitting a time interval TTI length, a MAC control element receiving device, a TTI length receiving device, and a MAC control element transmitting device, which is used for The above embodiments and preferred embodiments have been implemented, and the detailed description thereof has been omitted. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 14 is a structural block diagram of a first control channel detecting apparatus according to an embodiment of the present invention. As shown in FIG. 14, the apparatus includes a first receiving module 142 and a detecting module 144, which are described below:

The first receiving module 142 is configured to receive information related to a downlink available transmission time interval TTI length configured by the base station by using radio resource control RRC signaling or a media access control control unit MAC control related to a downlink available TTI length sent by the receiving base station The detecting module 144 is connected to the first receiving module 142, and configured to perform control channel detection according to the information related to the downlink available TTI length or the MAC control element.

In an optional embodiment, the MAC control element is used to indicate the length of the downlink available TTI, where the downlink available TTI length is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 symbols The numbers are 0, 1, 2, ... 13, respectively.

In an optional embodiment, the detecting module 144 may perform control channel detection according to the foregoing information related to the downlink available TTI length or the MAC control element by: according to the foregoing information related to the downlink available TTI length or the MAC control element. Determining the downlink available TTI length; performing control channel detection according to the downlink available TTI length, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal.

In an optional embodiment, when the downlink available TTI length includes 1 ms, the detecting module 144 may perform control channel detection according to the downlink available TTI length according to the downlink available TTI length in a 1 ms subframe. Physical uplink control channel PUCCH detection is performed on one or more of the location numbers 0, 1, and 2.

In an optional embodiment, when the downlink available TTI length includes one of OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, the foregoing detection module 144 may perform control channel detection according to the downlink available TTI length by performing sPDCCH detection on a specific symbol position within a 1 ms subframe according to the downlink available TTI length, where the sPDCCH is located within the downlink available TTI length.

In an optional embodiment, when the downlink available TTI length includes 4 or 3 OFDM symbols, the detecting module 144 may perform the following manner according to the downlink available TTI length in a specific symbol position within a 1 ms subframe. sPDCCH detection: determining the length of the TTI for performing sPDCCH detection from 4 or 3 OFDM symbols according to the position of the sPDCCH within the downlink available TTI length; performing sPDCCH detection according to the determined length of the TTI.

In an optional embodiment, the detecting module 144 may be at least one of the following manners according to the foregoing manner. Performing sPDCCH detection on a specific symbol position within a 1 ms subframe with a TTI length: when the downlink available TTI length includes 1 OFDM symbol, the physical downlink shared channel PDSCH region occupies one or more symbol positions in the 1 ms subframe Performing the sPDCCH detection on the uplink; when the downlink available TTI length includes 2 OFDM symbols, performing sPDCCH on one or more symbol positions in 0, 1, 2, 4, 6, 8, 10, 12 in the 1 ms subframe Detecting; when the downlink available TTI length includes 4 or 3 OFDM symbols, performing the sPDCCH on one or more symbol positions in 0, 1, 2, 3, 4, 7, 10, 11 in a 1 ms subframe Detection; when the downlink available TTI length includes 7 symbols, sPDCCH detection is performed on one or more symbol positions in 0, 1, 2, 7 within the 1 ms subframe.

In an optional embodiment, the foregoing apparatus further includes a downlink available TTI length reporting module, where the downlink available TTI length reporting module is configured to receive information related to a downlink available TTI length configured by the base station by using radio resource control RRC signaling. Or the shortest TTI length supported by the terminal is reported to the base station, and the shortest TTI length supported by the terminal is used by the base station to determine the foregoing, before the receiving, by the base station, the media control control unit MAC control element related to the downlink available TTI length. Information or MAC control element related to the length of the available TTI in the downlink. In this embodiment, the terminal can report the shortest TTI length of the downlink by using the capability report message UE Capability Information, and the terminal can support M types of TTIs of different lengths, where M>1, and the range of the TTI length is less than or equal to 1 ms. The M TTI length includes a 1 ms TTI, where the shortest TTI length is the minimum value of the M TTI lengths supported by the terminal.

In an optional embodiment, the first receiving module 142 may receive, by using the following manner, a media access control control unit MAC control element related to a downlink available TTI length sent by the base station: receiving a MAC protocol data unit PDU subheader The logical channel of the part identifies an indication value of the ID field, wherein the indication value is used to identify the MAC control element.

In an optional embodiment, the apparatus further includes a first replacement module, configured to receive the MAC control after receiving the media control control unit MAC control element related to the downlink available TTI length sent by the base station. The specific TTI length currently available to the terminal is replaced by the downlink available TTI length indicated by the MAC control element after the specific effective time after the element.

In an optional embodiment, the detecting module 144 may perform control channel detection according to the information related to the downlink available TTI length according to the foregoing manner: when the foregoing valid information indicates that the downlink information related to the downlink available TTI length indicates that the downlink is available. When the TTI length is valid, the currently available TTI length is switched to the downlink available TTI length indicated by the information related to the downlink available TTI length after the specific effective time; the control channel detection is performed according to the switched downlink available TTI length.

FIG. 15 is a structural block diagram of a TTI length reporting apparatus according to an embodiment of the present invention. As shown in FIG. 15, the apparatus includes a reporting module 152, which will be described below.

The reporting module 152 is configured to report the shortest TTI length supported by the terminal to the base station, where the terminal supports two or more different TTI lengths.

In an optional embodiment, the foregoing apparatus further includes a first processing module, where the first processing module is configured to receive, after the shortest TTI length supported by the terminal is reported to the base station, the base station to receive RRC signaling configuration by using radio resource control. The information related to the downlink available TTI length or the medium access control control unit MAC control element related to the downlink available TTI length sent by the base station, where the information related to the downlink available TTI length or the MAC control element is the base station according to the foregoing The shortest TTI length is determined; the control channel detection is performed according to the above information related to the downlink available TTI length or the MAC control element. In this embodiment, the information about the downlink available TTI length determined by the base station or the MAC control element related to the downlink available TTI length is used, so as to ensure that the terminal can determine the information related to the downlink available TTI length determined by the base station, or The MAC control element performs control channel detection, thereby reducing unnecessary control channel detection times, saving power consumption of the terminal, and avoiding waste of resources. The invention has solved the problem that the control channel detection needs to be performed on each symbol, which causes a large power consumption and wastes resources, thereby achieving the effect of saving power consumption and avoiding resource waste.

In an optional embodiment, the first processing module may perform control channel detection according to the foregoing information related to the downlink available TTI length or the MAC control element by: according to the foregoing information related to the downlink available TTI length or MAC control. The element determines the downlink available TTI length, and performs the control channel detection according to the downlink available TTI length, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal.

In an alternative embodiment, the above information related to the downlink available TTI length or the MAC control element When the indicated downlink available TTI length includes 1 ms, the first processing module may perform control channel detection according to the downlink available TTI length according to the following: the location number of the downlink available TTI length in the 1 ms subframe is 0, 1, 2 Physical uplink control channel PUCCH detection is performed on one or more symbols in the medium.

In an optional embodiment, when the downlink available TTI length includes one OFDM symbol, two OFDM symbols, four or three OFDM symbols, and one of seven OFDM symbols, the first The processing module may perform the control channel detection according to the downlink available TTI length in the following manner: performing sPDCCH detection on the specific symbol position in the 1 ms subframe according to the downlink available TTI length, where the sPDCCH is located in the downlink available TTI length related information or The length of the downlink available TTI indicated by the MAC control element.

In an optional embodiment, when the downlink available TTI length includes 4 or 3 OFDM symbols, the foregoing first processing module may be configured according to the downlink available TTI length in a specific symbol position within a 1 ms subframe according to the foregoing manner. Performing sPDCCH detection: determining the length of the TTI for performing sPDCCH detection from the 4 or 3 OFDM symbols according to the position of the sPDCCH within the downlink available TTI length; performing sPDCCH detection according to the determined length of the TTI.

In an optional embodiment, the first processing module may perform sPDCCH detection on a specific symbol position within a 1 ms subframe according to at least one of the following downlink available TTI lengths: when the downlink available TTI length includes one In the OFDM symbol, sPDCCH detection is performed on one or more symbol positions in the physical downlink shared channel PDSCH region occupied symbol in the 1 ms subframe; when the downlink available TTI length includes 2 OFDM symbols, 0, 1 in the 1 ms subframe sPDCCH detection at one or more symbol positions of 2, 4, 6, 8, 10, 12; when the downlink available TTI length includes 4 or 3 OFDM symbols, 0, 1, 2 in 1 ms subframe sPDCCH detection at one or more symbol positions in 3, 4, 7, 10, 11; when the downlink available TTI length includes 7 symbols, one of 0, 1, 2, 7 in a 1 ms subframe or sPDCCH detection is performed on a plurality of symbol positions.

In an optional embodiment, the first processing module may receive, by using the following manner, a media access control control unit MAC control element related to a downlink available TTI length sent by the base station: receiving the MAC protocol data unit PDU subheader The logical channel identifies an indication value of the ID field, wherein the indication value is used to identify the MAC control element.

In an optional embodiment, the apparatus further includes a second replacement module, configured to receive the MAC control after receiving the media control control unit MAC control element related to the downlink available TTI length sent by the base station. The specific TTI length currently available to the terminal is replaced by the downlink available TTI length indicated by the MAC control element after the specific effective time after the element.

In an optional embodiment, the first processing module may perform control channel detection according to the information related to the downlink available TTI length in the following manner: when the validity information indicates the downlink indicated by the information related to the downlink available TTI length. When the available TTI length is effective, the TTI length currently available to the terminal is switched to the downlink available TTI length indicated by the information related to the downlink available TTI length after the specific effective time; the control channel detection is performed according to the downlink available TTI length after the handover.

16 is a structural block diagram of a MAC control element receiving apparatus according to an embodiment of the present invention. As shown in FIG. 16, the apparatus includes a second receiving module 162, which is described below:

The second receiving module 162 is configured to receive an indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, where the indication value is used to identify the MAC control element, the MAC control element, and the downlink available TTI length. Related.

In an optional embodiment, the apparatus further includes a second processing module configured to perform control channel detection according to the MAC control element. In this embodiment, the MAC control element related to the downlink available TTI length is determined by the base station, so that the terminal can perform control channel detection according to the MAC control element determined by the base station, thereby reducing unnecessary control channel detection times and saving the terminal. The power consumption, to avoid waste of resources. The invention has solved the problem that the control channel detection needs to be performed on each symbol, which causes a large power consumption and wastes resources, thereby achieving the effect of saving power consumption and avoiding resource waste.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; and the downlink available TTI length indicated by the MAC control element includes 1 ms. And one OFDM symbol, two OFDM symbols, four or three OFDM symbols, one of seven OFDM symbols; the downlink available TTI length indicated by the MAC control element includes a radio resource Controlling the shortest TTI length in the RRC connection reconfiguration message; the MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.

In an optional embodiment, the apparatus further includes a third replacement module, configured to replace the currently available TTI length of the terminal with the downlink available TTI indicated by the MAC control element after the specific effective time after receiving the MAC control element. length.

Figure 17 is a block diagram showing the structure of a second control channel detecting apparatus according to an embodiment of the present invention. As shown in Figure 17, the apparatus includes a processing module 172, which will be described below.

The processing module 172 is configured to configure, by using the radio resource control RRC signaling, information related to the downlink available transmission time interval TTI length to the terminal, or send the media access control control unit MAC control element related to the downlink available TTI length to the terminal. And the information related to the downlink available TTI length or the MAC control element is used by the terminal to perform control channel detection.

In an optional embodiment, the MAC control element is used to indicate the length of the downlink available TTI, where the length of the downlink available TTI is less than or equal to 1 ms, where the 1 ms subframe includes 14 symbols, and the 14 The symbols are numbered 0, 1, 2, ... 13, respectively.

In an optional embodiment, the foregoing apparatus further includes a third processing module, configured to: configure, by using the foregoing radio resource control RRC signaling, the information related to the downlink available transmission time interval TTI length to the terminal, or Receiving, by the terminal, the shortest TTI length information supported by the terminal from the terminal before sending the media control control unit MAC control element related to the downlink available TTI length; determining, according to the shortest TTI length information supported by the terminal, the length of the downlink available TTI Information or MAC control element.

In an optional embodiment, the processing module 172 may send, to the terminal, a media access control control unit MAC control element related to a downlink available TTI length by using a logic located in a MAC protocol data unit PDU subheader. The indication value of the channel identification ID field is sent to the terminal by the MAC control element, where the indication value is used to identify the MAC control element.

In an optional embodiment, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, and the k bit in the 8 bits is used to indicate one or more downlink available TTI lengths, and the remaining bits. To reserve bits, 0<k<8.

In an optional embodiment, when the size of the MAC control element is 0, the following one is included: the downlink available TTI length indicated by the MAC control element is 1 ms; the downlink available TTI length indicated by the MAC control element includes 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the downlink available TTI length indicated by the MAC control element includes the shortest radio resource control RRC connection reconfiguration message The length of the TTI; the MAC control element is used by the terminal and the TTI currently available to the terminal to determine the downlink available TTI length of the terminal.

In an optional embodiment, the foregoing RRC signaling includes an RRC connection reconfiguration message, where the downlink available TTI length related information is located in a dedicated radio resource configuration cell of the RRC connection reconfiguration message.

In an optional embodiment, the foregoing RRC connection reconfiguration message further includes: whether the validity information corresponding to the downlink available TTI length is used, where the validity information is used to indicate that the downlink available T1 length related information of the terminal is available. Whether the TTI length is valid.

FIG. 18 is a structural block diagram of a TTI length receiving apparatus according to an embodiment of the present invention. As shown in FIG. 18, the apparatus includes a third receiving module 182, which is described below:

The third receiving module 182 is configured to receive the shortest TTI length supported by the terminal reported by the terminal, where the terminal supports two or more different TTI lengths.

In an optional embodiment, the foregoing apparatus further includes a fourth processing module, configured to: after receiving the shortest TTI length supported by the terminal reported by the terminal, determine, according to the shortest TTI length, information related to the downlink available TTI length or a media control control unit MAC control element associated with a TTI length; a downlink available TTI length related information is configured to the terminal by using radio resource control RRC signaling, or the MAC control element is sent to the terminal, where the downlink and the downlink are available. The TTI length related information or MAC control element is used for the above terminal to perform control channel detection.

In an optional embodiment, the foregoing MAC control element is used to indicate the length of the downlink available TTI, where the length of the available downlink TTI is less than or equal to 1 ms, wherein the 1 ms subframe includes 14 symbols, and the 14 symbols The numbers are 0, 1, 2, ... 13, respectively.

In an optional embodiment, the fourth processing module may send a MAC control element to the terminal by: indicating the value of the ID field in the logical channel identifier of the MAC protocol data unit PDU subheader. The element is sent to the terminal, wherein the indication value is used to identify the MAC control element.

FIG. 19 is a structural block diagram of a MAC control element transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 19, the apparatus includes a transmitting module 192, which is described below:

The sending module 192 is configured to send the MAC control element to the terminal by using an indication value of the logical channel identifier ID field located in the MAC protocol data unit PDU subheader, where the indication value is used to identify the MAC control element.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1. Receive information related to a downlink available transmission time interval TTI length configured by a base station by using a Radio Resource Controller (RRC) signaling, or a media access control control unit related to a downlink available TTI length sent by the receiving base station. MAC control element;

S2: Perform control channel detection according to the foregoing information related to the downlink available TTI length or the MAC control element.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S1, reporting the shortest TTI length supported by the terminal to the base station, where the terminal supports two or more different TTI lengths degree.

S1. Receive an indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, where the indication value is used to identify a MAC control element, where the MAC control element is related to a downlink available TTI length.

S1. Configure, by using radio resource control RRC signaling, information related to a downlink available transmission time interval TTI length to the terminal, or send, to the terminal, a media access control control unit MAC control element related to a downlink available TTI length, where The information related to the downlink available TTI length or the MAC control element is used for the above terminal to perform control channel detection.

S1. The shortest TTI length supported by the terminal reported by the terminal, where the terminal supports two or more different TTI lengths.

S1: Send the MAC control element to the terminal by using an indication value of the logical channel identifier ID field located in the MAC protocol data unit PDU subheader, where the indication value is used to identify the MAC control element.

Optionally, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM). A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.

Optionally, in the embodiment, the processor performs the above steps according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

Through the foregoing embodiments, the terminal supporting the shorter TTI length in the downlink can obtain the maximum support capability in the existing commercial LTE network, increase the flexibility, and report less information.

In addition, by the method of the present invention, the terminal can switch from a 1 ms TTI to a shorter TTI transmission or a shorter TTI to a 1 ms TTI according to the delay requirement of the downlink service, thereby achieving the purpose of balancing delay and control overhead. The terminal receives the downlink available TTI length information configured by the base station, and performs control channel detection based on the information, thereby reducing the number of detections of the terminal, thereby achieving the purpose of saving power consumption.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or make multiple modules or steps into a single The integrated circuit module is implemented. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, a control channel detection method, a TTI length reporting method, and a device provided by the embodiments of the present invention have the following beneficial effects: solving the problem of the related art that requires control channel detection on each symbol, resulting in power consumption. The large amount leads to the problem of waste of resources, thereby achieving the effect of saving power consumption and avoiding waste of resources.

Claims

A control channel detection method includes:

Receiving, by the eNB, the information about the length of the downlink available transmission time interval TTI configured by the radio resource control RRC signaling or the medium access control control unit MAC control element sent by the receiving base station and related to the downlink available TTI length;

Control channel detection is performed according to the information related to the downlink available TTI length or the MAC control element.
The method according to claim 1, wherein the MAC control element is used to indicate the length of the downlink available TTI, and the downlink available TTI length is less than or equal to 1 ms, wherein the 1 ms subframe includes 14 symbols. The 14 symbols are numbered 0, 1, 2, ... 13, respectively.
The method of claim 2, wherein the performing the control channel detection according to the information related to a downlink available TTI length or the MAC control element comprises:

Determining the downlink available TTI length according to the information related to the downlink available TTI length or the MAC control element;

The control channel detection is performed according to the downlink available TTI length, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal.
The method according to claim 3, wherein the plurality of TTI lengths comprise one of four cases of 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols.
The method according to claim 3 or 4, wherein, when the downlink available TTI length comprises 1 ms, performing the control channel detection according to the downlink available TTI length comprises:

The physical uplink control channel PUCCH detection is performed on one or more of the 0, 1, and 2 positions of the downlink available TTI length in the 1 ms subframe.
The method according to claim 3 or 4, wherein when the downlink available TTI length comprises one of four cases of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols And performing, by the downlink available TTI length, the control channel detection includes:

Performing a short physical downlink control channel sPDCCH detection according to the downlink available TTI length in a specific symbol position within a 1 ms subframe, wherein the sPDCCH is located within the downlink available TTI length.
The method according to claim 6, wherein when the downlink available TTI length includes 4 or 3 OFDM symbols, the sPDCCH detection is performed according to the downlink available TTI length in a specific symbol position within a 1 ms subframe. include:

Determining, according to a location of the sPDCCH within the downlink available TTI length, a length of a TTI for performing the sPDCCH detection from the 4 or 3 OFDM symbols;

The sPDCCH detection is performed according to the determined length of the TTI.
The method according to claim 6, wherein the performing the sPDCCH detection on a specific symbol position within a 1 ms subframe according to the downlink available TTI length comprises at least one of the following:

When the downlink available TTI length includes 1 OFDM symbol, performing the sPDCCH detection on one or more symbol positions in a physical downlink shared channel PDSCH region occupied symbol in a 1 ms subframe;

When the downlink available TTI length includes 2 OFDM symbols, performing the sPDCCH detection on one or more symbol positions in 0, 1, 2, 4, 6, 8, 10, 12 in a 1 ms subframe;

When the downlink available TTI length includes 4 or 3 OFDM symbols, performing the sPDCCH on one or more symbol positions in 0, 1, 2, 3, 4, 7, 10, 11 within a 1 ms subframe Detection

When the downlink available TTI length includes 7 symbols, the sPDCCH detection is performed at one or more symbol positions of 0, 1, 2, 7 within a 1 ms subframe.
The method according to claim 1, wherein the receiving, by the base station, the information related to a downlink available TTI length configured by the radio resource control RRC signaling or receiving the downlink available TTI sent by the base station Before the length of the MAC control element, the method further includes:

The shortest TTI length supported by the terminal is reported to the base station, wherein the shortest TTI length supported by the terminal is used by the base station to determine the information related to the downlink available TTI length or the MAC control element.
The method according to claim 1, wherein the receiving, by the base station, the MAC control element related to the downlink available TTI length comprises:

Receiving an indication value of a logical channel identification ID field located in a MAC protocol data unit PDU subheader, wherein the indication value is used to identify the MAC control element.
The method according to claim 10, wherein the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, and the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
The method according to any one of claims 1 to 11, wherein one of the following is included:

The size of the MAC control element is 0;

The size of the MAC control element is 8 bits, where k bits in the 8 bits are used to indicate one or more downlink available TTI lengths, and the remaining bits are reserved bits, 0<k<8.
The method of claim 11, wherein when the size of the MAC control element is 0, one of the following is included:

The downlink available TTI length indicated by the MAC control element is 1 ms;

The downlink available TTI length indicated by the MAC control element includes 1 ms and 1 OFDM symbol, 2 One of four cases of OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols;

The downlink available TTI length indicated by the MAC control element includes a shortest TTI length in the RRC connection reconfiguration message;

The MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.
The method according to any one of claims 1 to 13, wherein after receiving the MAC control element sent by the base station and related to the downlink available TTI length, the method further includes:

The TTI length currently available to the terminal is replaced by the downlink available TTI length indicated by the MAC control element after the specific effective time after receiving the MAC control element.
The method of claim 1, wherein the RRC signaling comprises an RRC Connection Reconfiguration message, the information related to a downlink available TTI length being located in a dedicated radio resource configuration cell of the RRC Connection Reconfiguration message.
The method of claim 15, wherein the RRC connection reconfiguration message further includes validity information corresponding to the downlink available TTI length, wherein the validity information is used to indicate that the downlink is available. Whether the downlink available TTI length indicated by the TTI length related information is valid.
The method according to claim 16, wherein the performing the control channel detection according to the information related to the downlink available TTI length comprises:

When the validity information indicates that the downlink available TTI length indicated by the information related to the downlink available TTI length is valid, after the specific effective time, the currently available TTI length is switched to the information indication related to the downlink available TTI length. The downlink available TTI length;

Control channel detection is performed according to the downlink available TTI length after handover.
A reporting method for transmitting a time interval TTI length includes:

The shortest TTI length supported by the terminal is reported to the base station, where the terminal supports two or more different TTI lengths.
The method of claim 18, wherein after the reporting the shortest TTI length supported by the terminal to the base station, the method further comprises:

Receiving, by the base station, information related to a downlink available TTI length configured by radio resource control RRC signaling or receiving a media access control control unit MAC control element related to a downlink available TTI length sent by the base station, where The downlink available TTI length related information or the MAC control element is determined by the base station according to the shortest TTI length;

Control channel detection is performed according to the information related to the downlink available TTI length or the MAC control element.
The method according to claim 19, wherein the MAC control element is used to indicate the length of the downlink available TTI, and the downlink available TTI length is less than or equal to 1 ms, wherein the 1 ms subframe includes 14 symbols. The 14 symbols are numbered 0, 1, 2, ... 13, respectively.
The method according to claim 20, wherein said controlling channel detection according to said information related to a downlink available TTI length or said MAC control element comprises:

Determining the downlink available TTI length according to the information related to the downlink available TTI length or the MAC control element;

The control channel detection is performed according to the downlink available TTI length, where the downlink available TTI length is one or more TTI lengths determined from two or more TTI lengths supported by the terminal.
A media access control control unit MAC control element receiving method includes:

And receiving an indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, wherein the indication value is used to identify the MAC control element, and the MAC control element is related to a downlink available TTI length.
The method of claim 22, wherein the method further comprises:

Control channel detection is performed according to the MAC control element.
The method according to claim 22, wherein the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, and the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
A method according to any one of claims 22 to 24, comprising one of the following:

The size of the MAC control element is 0;

The size of the MAC control element is 8 bits, where k bits in the 8 bits are used to indicate one or more downlink available TTI lengths, and the remaining bits are reserved bits, 0<k<8.
The method of claim 25, wherein when the size of the MAC control element is 0, one of the following is included:

The downlink available TTI length indicated by the MAC control element is 1 ms;

The downlink available TTI length indicated by the MAC control element is 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and one of 7 OFDM symbols;

The downlink available TTI length indicated by the MAC control element includes a shortest TTI length in the RRC connection reconfiguration message;

The MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.
The method of any of claims 22 to 26, wherein the method further comprises:

The TTI length currently available to the terminal is replaced by the downlink available TTI length indicated by the MAC control element after the specific effective time after receiving the MAC control element.
A control channel detection method includes:

Configuring, by the radio resource control RRC signaling, information related to the length of the downlink available transmission time interval TTI, or transmitting, to the terminal, a media access control control unit MAC control element related to the downlink available TTI length, where the The downlink available TTI length related information or the MAC control element is used by the terminal for control channel detection.
The method according to claim 28, wherein the MAC control element is used to indicate the length of the downlink available TTI, and the downlink available TTI length is less than or equal to 1 ms, wherein the 1 ms subframe includes 14 symbols. The 14 symbols are numbered 0, 1, 2, ... 13, respectively.
The method according to claim 28, wherein information related to the downlink available TTI length is configured to the terminal by using the RRC signaling, or the terminal is sent with the downlink available TTI length. Before the MAC control element, the method further includes:

Receiving shortest TTI length information supported by the terminal from the terminal;

Determining the information related to the downlink available TTI length or the MAC control element according to the shortest TTI length information supported by the terminal.
The method of claim 28, wherein transmitting the MAC control element related to the downlink available TTI length to the terminal comprises:

The MAC control element is sent to the terminal by an indication value of a logical channel identification ID field located in a MAC protocol data unit PDU subheader, wherein the indication value is used to identify the MAC control element.
The method according to claim 31, wherein the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, and the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
A method according to any one of claims 28 to 32, comprising one of the following:

The size of the MAC control element is 0;

The size of the MAC control element is 8 bits, where k bits in the 8 bits are used to indicate one or more downlink available TTI lengths, and the remaining bits are reserved bits, 0<k<8.
The method of claim 33, wherein when the size of the MAC control element is 0, one of the following is included:

The downlink available TTI length indicated by the MAC control element is 1 ms;

The downlink available TTI length indicated by the MAC control element includes one of 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols;

The downlink available TTI length indicated by the MAC control element includes a shortest TTI length in the RRC connection reconfiguration message;

The MAC control element is used by the terminal and the TTI currently available to the terminal to determine a downlink available TTI length of the terminal.
The method of claim 28, wherein the RRC signaling comprises an RRC Connection Reconfiguration message, the information related to a downlink available TTI length being located in a dedicated radio resource configuration cell of the RRC Connection Reconfiguration message.
The method of claim 35, wherein the RRC connection reconfiguration message further includes validity information corresponding to the downlink available TTI length, wherein the validity information is used to indicate the terminal Whether the downlink available TTI length indicated by the information related to the downlink available TTI length is valid.
A receiving method for transmitting a time interval TTI length, comprising:

And receiving, by the terminal, a shortest TTI length supported by the terminal, where the terminal supports two or more different TTI lengths.
The method of claim 37, wherein after receiving the shortest TTI length supported by the terminal reported by the terminal, the method further comprises:

Determining, according to the shortest TTI length, information related to a downlink available TTI length or a media access control control unit MAC control element related to a downlink available TTI length;

Configuring, by the radio resource control RRC signaling, the information related to the downlink available TTI length to the terminal, or sending the MAC control element to the terminal, where the information related to the downlink available TTI length or The MAC control element is used by the terminal to perform control channel detection.
The method according to claim 38, wherein the MAC control element is used to indicate the length of the downlink available TTI, and the downlink available TTI length is less than or equal to 1 ms, wherein the 1 ms subframe includes 14 symbols. The 14 symbols are numbered 0, 1, 2, ... 13, respectively.
A media access control control unit MAC control element sending method includes:

The MAC control element is sent to the terminal by an indication value of the logical channel identification ID field located in the MAC protocol data unit PDU subheader, wherein the indication value is used to identify the MAC control element.
The method of claim 40 wherein said MAC control element is used by said terminal for control channel detection.
The method of claim 40, wherein the MAC PDU is located on a physical downlink shared channel PDSCH or In the sPDSCH, the PDSCH or sPDSCH is located within the TTI length currently available to the terminal.
A method according to any one of claims 40 to 42, wherein one of the following is included:

The size of the MAC control element is 0;

The size of the MAC control element is 8 bits, where k bits in the 8 bits are used to indicate one or more downlink available TTI lengths, and the remaining bits are reserved bits, 0<k<8.
The method of claim 43, wherein when the size of the MAC control element is 0, one of the following is included:

The downlink available TTI length indicated by the MAC control element is 1 ms;

The downlink available TTI length indicated by the MAC control element is 1 ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and one of 7 OFDM symbols;

The downlink available TTI length indicated by the MAC control element includes a shortest TTI length in the RRC connection reconfiguration message;

The MAC control element is used to determine the downlink available TTI length of the terminal together with the currently available TTI length of the terminal.
A control channel detecting device includes:

a first receiving module, configured to receive information related to a downlink available transmission time interval TTI length configured by the base station by using radio resource control RRC signaling, or a media access control control unit MAC control element related to a downlink available TTI length sent by the receiving base station ;

The detecting module is configured to perform control channel detection according to the information related to the downlink available TTI length or the MAC control element.
A reporting device for transmitting a time interval TTI length, comprising:

The reporting module is configured to report the shortest TTI length supported by the terminal to the base station, where the terminal supports two or more different TTI lengths.
A medium access control control unit MAC control element receiving device includes:

a second receiving module, configured to receive an indication value of a logical channel identifier ID field located in a MAC protocol data unit PDU subheader, where the indication value is used to identify the MAC control element, and the MAC control element and the downlink are available. TTI length is related.
A control channel detecting device includes:

The processing module is configured to configure, by using the radio resource control RRC signaling, information related to the downlink available transmission time interval TTI length to the terminal, or send the media access control control related to the downlink available TTI length to the terminal And a MAC control element, wherein the information related to a downlink available TTI length or the MAC control element is used by the terminal to perform control channel detection.
A receiving device for transmitting a time interval TTI length, comprising:

The third receiving module is configured to receive the shortest TTI length supported by the terminal reported by the terminal, where the terminal supports two or more different TTI lengths.
A medium access control control unit MAC control element sending device includes:

The sending module is configured to send the MAC control element to the terminal by using an indication value of the logical channel identifier ID field located in the MAC protocol data unit PDU subheader, where the indication value is used to identify the MAC control element.
A storage medium, characterized in that the storage medium comprises a stored program, wherein the program is executed to perform the method of any one of claims 1 to 44.
A processor, wherein the processor is operative to run a program, wherein the program is operative to perform the method of any one of claims 1 to 44.