CN107295614B - Control channel detection method, and method and device for reporting TTI length - Google Patents

Control channel detection method, and method and device for reporting TTI length Download PDF

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Publication number
CN107295614B
CN107295614B CN201610202536.0A CN201610202536A CN107295614B CN 107295614 B CN107295614 B CN 107295614B CN 201610202536 A CN201610202536 A CN 201610202536A CN 107295614 B CN107295614 B CN 107295614B
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tti length
control element
mac control
terminal
downlink
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CN107295614A (en
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陈冬雷
夏树强
谢峰
游爱民
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2017/078995 priority patent/WO2017167270A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention provides a control channel detection method, a reporting method of TTI length and a device thereof, wherein the control channel detection method comprises the following steps: receiving information related to a downlink available Transmission Time Interval (TTI) length configured by a base station through Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC) control element related to the downlink available TTI length sent by the base station; and detecting a control channel according to the related information of the downlink available TTI length or the MAC control element. The invention solves the problems of large power consumption and resource waste caused by the fact that control channel detection is required to be carried out on each symbol in the related technology, thereby achieving the effects of saving power consumption and avoiding resource waste.

Description

Control channel detection method, and method and device for reporting TTI length
Technical Field
The invention relates to the field of communication, in particular to a control channel detection method, a TTI length reporting method and a TTI length reporting device.
Background
A Long-Term Evolution (LTE) mobile communication network has been studied from The 3rd Generation Partnership Project (3 GPP) Project to date, and uses 1ms subframes for data transmission. With the emergence of new applications with higher requirements on time delay, such as virtual reality, real-time cloud computing and the like, new requirements are also put forward on an LTE network, such as reduction of air interface transmission time delay. Therefore, in the recent 3GPP conference, Ericsson proposes a research establishment for air interface transmission in a RAN2(Radio Access Network) conference. In the 3GPP RAN #67 conference, a study item on reduction of air interface transmission delay is passed. In this study item, it is indicated that performance gains due to different Transmission Time Interval (TTI) lengths need to be evaluated, including 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol, 2 OFDM symbols, 3 OFDM symbols, 4 OFDM symbols, and 7 OFDM symbols.
Ericsson proposes in its proposal R1-160931 to use a dynamic TTI length method to transmit data so as to adaptively respond to data in a terminal data buffer, and the TTI length used by the terminal for each data scheduling is indicated by a control channel. However, the method in this proposal brings about a problem that the terminal may need to perform control channel detection on each symbol, resulting in a relatively large power consumption of the terminal. Also, the transmission of the TTI length indication value in each TTI also introduces additional control channel overhead.
Therefore, the related art needs to perform control channel detection on each symbol, which results in large power consumption and resource waste.
In view of the above problems, no effective solution has been proposed in the related art.
Disclosure of Invention
The invention provides a control channel detection method, a TTI length reporting method and a TTI length reporting device, which are used for at least solving the problems of high power consumption of a terminal and resource waste caused by the fact that control channel detection needs to be carried out on each symbol in the related technology.
According to an aspect of the present invention, there is provided a control channel detection method, including: receiving information related to the length of a downlink available Transmission Time Interval (TTI) configured by a base station through Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC) control element related to the length of the downlink available TTI sent by the base station; and detecting a control channel according to the relevant information of the downlink available TTI length or the MAC control element.
Optionally, the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and numbers of the 14 symbols are 0,1,2, and … 13, respectively.
Optionally, the detecting the control channel according to the information related to the downlink available TTI length or the MAC control element includes: determining one or more TTI lengths from more than two TTI lengths supported by a terminal according to the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element, wherein the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal; and detecting the control channel according to the determined TTI length.
Optionally, the plurality of TTI lengths comprises one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols.
Optionally, when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element includes 1ms, performing control channel detection according to the information related to the downlink available TTI length or the MAC control element includes: and carrying out physical downlink control channel PUCCH detection on one or more symbols with the position numbers of 0,1 and 2 in a 1ms subframe according to the downlink available TTI length related information or the MAC control element.
Optionally, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, performing control channel detection according to the downlink available TTI length related information or the MAC control element includes: and performing short physical downlink control channel (sPDCCH) detection on a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element, wherein the sPDCCH is positioned in the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element.
Optionally, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 4 or 3 OFDM symbols, performing sPDCCH detection at a specific symbol position within a 1ms subframe according to the downlink available TTI length related information or the MAC control element includes: determining the length of TTI for carrying out the sPDCCH detection from the 4 or 3 OFDM symbols according to the position of the sPDCCH in the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element; and carrying out the sPDCCH detection according to the determined length of the TTI.
Optionally, the performing, according to the information related to the downlink available TTI length or the MAC control element, the sPDCCH detection on a specific symbol position in a 1ms subframe includes at least one of: when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 1 OFDM symbol, performing the sPDCCH detection on one or more symbol positions in symbols occupied by a Physical Downlink Shared Channel (PDSCH) region in a 1ms subframe; when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 2 OFDM symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2, 4, 6, 8, 10, 12 in a 1ms subframe; when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 4 or 3 OFDM symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2, 3, 4, 7, 10, 11 in a 1ms subframe; and when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 7 symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2 and 7 in a 1ms subframe.
Optionally, before receiving information related to a downlink available TTI length configured by the base station through the RRC signaling or receiving the MAC control element sent by the base station and related to the downlink available TTI length, the method further includes: and reporting the shortest TTI length supported by the terminal to the base station, wherein the shortest TTI length supported by the terminal is used for the base station to determine the information related to the downlink available TTI length or the MAC control element.
Optionally, the receiving, by the MAC control element, the MAC control element related to the downlink available TTI length sent by the base station includes: receiving an indication value of a logical channel Identification (ID) field located in a subheader of a MAC Protocol Data Unit (PDU), wherein the indication value is used for identifying 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, and the PDSCH or sPDSCH is located within a currently available TTI length of the terminal.
Optionally, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
Optionally, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element comprises 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message; the MAC control element is used for determining the downlink available TTI length of the terminal together with the current 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: and 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 the MAC control element is received.
Optionally, the 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 information element of the RRC connection reconfiguration message.
Optionally, the RRC connection reconfiguration message further includes information of whether to take effect corresponding to the downlink available TTI length, where the information of whether to take effect is used to indicate whether the downlink available TTI length indicated by the information related to the downlink available TTI length is taken effect.
Optionally, the detecting the control channel according to the information related to the downlink available TTI length includes: when the information indicating whether to take effect indicates that the downlink available TTI length indicated by the information related to the downlink available TTI length takes effect, switching the currently available TTI length to the downlink available TTI length indicated by the information related to the downlink available TTI length after a specific effective time; and detecting the control channel according to the switched downlink available TTI length.
According to another aspect of the present invention, a method for reporting a TTI length is provided, including: and reporting the shortest TTI length supported by the terminal to a base station, wherein the terminal supports more than two different TTI lengths.
Optionally, after reporting the shortest TTI length supported by the terminal to the base station, the method further includes: receiving downlink available TTI length related information configured by the base station through Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC) control element which is sent by the base station and is related to the downlink available TTI length, wherein the downlink available TTI length related information or the MAC control element is determined by the base station according to the shortest TTI length; and detecting a control channel according to the relevant information of the downlink available TTI length or the MAC control element.
Optionally, the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and numbers of the 14 symbols are 0,1,2, and … 13, respectively.
Optionally, the detecting the control channel according to the information related to the downlink available TTI length or the MAC control element includes: determining one or more TTI lengths from more than two TTI lengths supported by a terminal according to the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element, wherein the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal; and detecting the control channel according to the determined TTI length.
According to another aspect of the present invention, there is provided a medium access control element MAC control element receiving method, including: receiving an indication value of a logical channel Identification (ID) field at a subheader of a Media Access Control (MAC) Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element, and the MAC control element is related to a downlink available Transmission Time Interval (TTI).
Optionally, the method further comprises: and detecting a control channel 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, and the PDSCH or sPDSCH is located within a currently available TTI length of the terminal.
Optionally, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
Optionally, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MACcontrol element is 1 ms; the TTI length indicated by the MAC control element is 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message; the MAC control element is used for determining the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
Optionally, the method further comprises: and replacing the TTI length currently available for the terminal with the TTI length indicated by the MAC control element after the specific effective time after the MAC control element is received.
According to another aspect of the present invention, there is provided a control channel detection method, including: configuring information related to a downlink available Transmission Time Interval (TTI) length to a terminal through Radio Resource Control (RRC) signaling, or sending a Media Access Control (MAC) control element related to the downlink available TTI length to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel.
Optionally, the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and numbers of the 14 symbols are 0,1,2, and … 13, respectively.
Optionally, before configuring the information related to the downlink available transmission time interval TTI length to a terminal through the radio resource control RRC signaling, or sending the media access control element MAC control element related to the downlink available TTI length to the terminal, the method further includes: receiving information of the shortest TTI length supported by the terminal from the terminal; and determining the relevant information of the downlink available TTI length or the MAC control element according to the shortest TTI length information supported by the terminal.
Optionally, the sending, to the terminal, the MAC control element related to the downlink available TTI length includes: and sending the MAC control element to the terminal through an indicated value of a logical channel Identification (ID) field positioned at the subheader of a MAC Protocol Data Unit (PDU), wherein the indicated value is used for identifying 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, and the PDSCH or sPDSCH is located within a currently available TTI length of the terminal.
Optionally, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
Optionally, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element comprises 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message; and the MAC control element is used for jointly determining the downlink available TTI length of the terminal by the terminal and the current available TTI of the terminal.
Optionally, the 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 information element of the RRC connection reconfiguration message.
Optionally, the RRC connection reconfiguration message further includes information of whether to take effect corresponding to the downlink available TTI length, where the information of whether to take effect is used to indicate whether the downlink available TTI length indicated by the information related to the downlink available TTI length of the terminal takes effect.
According to another aspect of the present invention, there is provided a receiving method of a transmission time interval, TTI, length, comprising: and receiving the shortest TTI length supported by the terminal reported by the terminal, wherein the terminal supports more than two different TTI lengths.
Optionally, after receiving the shortest TTI length supported by the terminal and reported by the terminal, the method further includes: determining information related to the downlink available TTI length or a media access control unit (MAC) control element related to the downlink available TTI length according to the shortest TTI length; and configuring the information related to the downlink available TTI length to a terminal through Radio Resource Control (RRC) signaling, or sending the MAC control element to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel.
Optionally, the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and numbers of the 14 symbols are 0,1,2, and … 13, respectively.
According to another aspect of the present invention, there is provided a MAC control element transmission method, including: and sending the MAC control element to the terminal through an indicated value of a logical channel Identification (ID) field positioned at the subheader of the MAC Protocol Data Unit (PDU), wherein the indicated value is used for identifying the MAC control element.
Optionally, the MAC control element is used for the terminal to perform control channel detection.
Optionally, the MAC PDU is located in a PDSCH or sPDSCH of a physical downlink shared channel, and the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
Optionally, the size of the MAC control element is 0; or the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
Optionally, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element is 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message; the MAC control element is used for determining the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
According to another aspect of the present invention, there is provided a control channel detecting apparatus including: a first receiving module, configured to receive information related to a downlink available Transmission Time Interval (TTI) length configured by a base station through Radio Resource Control (RRC) signaling or receive a media access control unit (MAC) control element related to the downlink available TTI length sent by the base station; and the detection module is used for detecting the control channel according to the relevant information of the downlink available TTI length or the MAC control element.
According to another aspect of the present invention, an apparatus for reporting a TTI length is provided, including: and the reporting module is used for reporting the shortest TTI length supported by the terminal to the base station, wherein the terminal supports more than two different TTI lengths.
According to another aspect of the present invention, there is provided a medium access control element MAC control element receiving apparatus including: a second receiving module, configured to receive an indication value of a logical channel identifier ID field located in a subheader of a MAC protocol data unit PDU, where the indication value is used to identify the MAC control element, and the MAC control element is related to a downlink available TTI length.
According to another aspect of the present invention, there is provided a control channel detecting apparatus including: a processing module, configured to configure information related to a downlink available transmission time interval TTI length to a terminal through radio resource control RRC signaling, or send a media access control element MAC control element related to the downlink available TTI length 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.
According to another aspect of the present invention, there is provided a receiving apparatus of a transmission time interval, TTI, length, comprising: and a third receiving module, configured to receive a shortest TTI length supported by the terminal, where the terminal supports more than two different TTI lengths.
According to another aspect of the present invention, there is provided a medium access control element MAC control element transmission apparatus including: a sending module, configured to send a MAC control element to a terminal through an indication value of a logical channel identifier ID field located in a subheader of a MAC protocol data unit PDU, where the indication value is used to identify the MAC control element.
According to the invention, the base station determines the relevant information of the downlink available TTI length, or the MAC control element relevant to the downlink available TTI length, so that the relevant information of the downlink available TTI length determined according to the base station is ensured, or the MAC control element carries out control channel detection, thereby reducing unnecessary control channel detection times, saving electric quantity consumption and avoiding resource waste. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a first control channel detection method according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for reporting a TTI length according to an embodiment of the present invention;
fig. 3 is a flowchart of a MAC control element receiving method according to an embodiment of the present invention;
FIG. 4 is a flow chart of a second control channel detection method according to an embodiment of the present invention;
fig. 5 is a flow chart of a receiving method of a transmission time interval, TTI, length according to an embodiment of the invention;
fig. 6 is a flowchart of a MAC control element transmission method according to an embodiment of the present invention;
FIG. 7 is a first exemplary level of downlink support TTI length capability for base stations and terminals in an LTE system that supports transmission in shorter TTIs in accordance with an embodiment of the present invention;
FIG. 8 is a second exemplary level of downlink support TTI length capability for base stations and terminals in an LTE system that supports transmission in shorter TTIs in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of an LTE communication system supporting transmission in shorter TTIs in accordance with an embodiment of the present invention;
FIG. 10 is a first diagram illustrating control channel detection for a downlink available TTI length in accordance with an embodiment of the present invention;
FIG. 11 is a second diagram illustrating control channel detection according to the downlink available TTI length in the embodiment of the present invention;
fig. 12 is a diagram of a logical channel ID field indication value of a MAC control element in a MAC PDU subheader for indicating terminal available TTI length information according to an embodiment of the present invention;
fig. 13 is a diagram illustrating a configuration of a MAC control element for indicating terminal available TTI length information according to an embodiment of the present invention;
fig. 14 is a block diagram of a first control channel detection apparatus according to an embodiment of the present invention;
fig. 15 is a block diagram of an apparatus for reporting a TTI length according to an embodiment of the present invention;
fig. 16 is a block diagram of a structure of a MAC control element receiving apparatus according to an embodiment of the present invention;
fig. 17 is a block diagram of a second control channel detecting apparatus according to an embodiment of the present invention;
FIG. 18 is a block diagram of a receiving apparatus of TTI length in accordance with an embodiment of the present invention;
fig. 19 is a block diagram of a structure of a MAC control element transmission apparatus according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In the present embodiment, a control channel detection method is provided, and 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 flowchart includes the following steps:
step S102, receiving information related to a downlink available Transmission Time Interval (TTI) length configured by a base station through a Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC) control element related to the downlink available TTI length sent by the base station;
and step S104, detecting the control channel according to the related information of the downlink available TTI length or the MAC control element.
Wherein, it may be the terminal that performs the above-mentioned operations.
Through the steps, the base station determines the relevant information of the downlink available TTI length, or the MAC control element relevant to the downlink available TTI length, so that the terminal can perform control channel detection according to the relevant information of the downlink available TTI length determined by the base station, or the MAC control element, unnecessary control channel detection times can be reduced, the power consumption of the terminal is saved, and resource waste is avoided. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
In an optional embodiment, the TTI length indicated by the above information on the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively. It can be known from the foregoing embodiments that, in order to solve the problem in the related art that power consumption is large and resource waste is caused due to the fact that control channel detection needs to be performed on each symbol, configuring the TTI length supported by the terminal by using a semi-static method is a more reasonable method, that is, according to the service delay requirement, the TTI length available to the terminal is configured in a semi-static manner by the base station, and according to the configured TTI length, the terminal determines the symbol position where the control channel needs to be detected, thereby reducing the detection of the control channel. When the terminal receives data by adopting a shorter TTI length, the control channel overhead is increased due to the shortened TTI length, so that the base station can configure the TTI to be longer or even 1ms TTI for receiving data so as to reduce the control channel transmission overhead in consideration of the compromise between the time delay and the overhead for the service with lower time delay requirement. Therefore, the terminal can also reduce the detection times of the terminal by receiving the information of the downlink available TTI length configured by the base station and detecting the control channel on the specific symbol in the 1ms subframe based on the information, thereby achieving the purpose of saving the power consumption.
In an optional embodiment, the detecting the control channel according to the information related to the available downlink TTI length or the MAC control element includes: determining one or more TTI lengths from more than two TTI lengths supported by the terminal according to the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element, wherein the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal; and detecting the control channel according to the determined TTI length. In this embodiment, the downlink may indicate one or more TTI lengths according to the TTI length related information, and the MAC control element may indicate one or more TTI lengths.
In an alternative embodiment, the plurality of TTI lengths include one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, and in this embodiment, the plurality of TTI lengths may be two TTI lengths, one of the two TTI lengths is 1ms, and the other is one of the four lengths.
In an optional embodiment, when the TTI length indicated by the information related to the downlink available TTI length or the MAC control element includes 1ms, performing control channel detection according to the information related to the downlink available TTI length or the MAC control element includes: and performing physical downlink control channel PUCCH detection on one or more symbols with position numbers of 0,1 and 2 in the 1ms subframe according to the downlink available TTI length related information or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, performing control channel detection according to the downlink available TTI length related information or the MAC control element includes: and performing short-PDCCH (short-PDCCH) detection at a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element, wherein the sPDCCH is located within the downlink available TTI length indicated by the information related to the downlink available TTI length or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 4 or 3 OFDM symbols, performing sPDCCH detection at a specific symbol position in a 1ms subframe according to the downlink available TTI length related information or the MAC control element includes: determining the length of TTI for carrying out the sPDCCH detection from 4 or 3 OFDM symbols according to the position of the sPDCCH in the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element; and carrying out sPDCCH detection according to the determined length of the TTI.
In an optional embodiment, performing sPDCCH detection on a specific symbol position within a 1ms subframe according to the information about the downlink available TTI length or the MAC control element includes at least one of: when the TTI length related information of the downlink available TTI length or the TTI length indicated by the MAC control element comprises 1 OFDM symbol, carrying out the sPDCCH detection on one or more symbol positions in the symbols occupied by the physical downlink shared channel PDSCH region in the 1ms subframe; when the TTI length related information or the TTI length indicated by the MAC control element comprises 2 OFDM symbols, carrying out sPDCCH detection at one or more symbol positions in 0,1,2, 4, 6, 8, 10 and 12 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises 4 or 3 OFDM symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2, 3, 4, 7, 10, 11 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or MAC control element includes 7 symbols, sPDCCH detection is performed at one or more symbol positions in 0,1,2, 7 within a 1ms subframe.
In an optional embodiment, before receiving information related to a downlink available TTI length configured by the base station through radio resource control RRC signaling or receiving a media access control element MAC control element sent by the base station and related to the downlink available TTI length, the method further includes: and reporting the shortest TTI length supported by the terminal to a base station, wherein the shortest TTI length supported by the terminal is used for the base station to determine the related information of the downlink available TTI length or the MAC control element. In this embodiment, the terminal may report, through the Capability reporting message UE Capability Information, that the downlink supports the shortest TTI length, where the downlink of the terminal may support M TTIs with different lengths, where M is greater than 1, a value range of the TTI length is less than or equal to 1ms, the M TTI lengths include 1ms TTI, and the shortest TTI length is a minimum value of the M TTI lengths supported by the downlink of the terminal.
In an optional embodiment, receiving a MAC control element sent by the base station and related to a downlink available TTI length includes: and receiving an indication value of a logical channel Identification (ID) field positioned in a subheader of a Media Access Control (MAC) Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element. In this embodiment, for a terminal supporting short TTI data reception in downlink, when the base station configures multiple downlink available TTI lengths for the terminal, the base station may switch the TTI length used in the downlink of the terminal by using the MAC control element according to the requirement of the current service on the delay.
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 alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where kbit of the 8 bits is used to indicate one or more downlink available TTI lengths, the remaining bits (i.e., the remaining (8-k) bits) are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises 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 current available TTI length of the terminal.
In an optional embodiment, after receiving the MAC control element related to the downlink available TTI length sent by the base station, the method further includes: and 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 the MAC control element is received.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length is valid.
In an optional embodiment, the detecting the control channel according to the information related to the length of the downlink available TTI includes: when the information indicating whether the valid information indicates that the downlink available TTI length indicated by the information related to the downlink available TTI length is valid, switching the currently available TTI length to the downlink available TTI length indicated by the information related to the downlink available TTI length after a specific valid time; and detecting the control channel according to the switched downlink available TTI length.
Currently, a large number of LTE networks are in commercial use, and backward compatibility is required in a research item for reducing air interface transmission delay, that is, after a terminal supporting a shorter TTI length is upgraded to an existing LTE commercial network and accesses a network, an old LTE terminal does not enter the network. But shorter TTI lengths place higher demands on the base station processing capacity. Some deployed base stations have limited capability to support shorter TTIs due to poor processing capability, i.e., for some TTI lengths, the deployed base stations cannot support them. Likewise, shorter TTI lengths place higher demands on the processing power of the terminals, which will vary in cost for terminals of different processing power. In this embodiment, a terminal supporting downlink data reception with a shorter TTI length, for example, 2 OFDM symbols, can also process reception of 3, 4, or 7 OFDM data when the terminal can support 2 OFDM symbol TTI data reception, considering from the processing capability of the terminal, and therefore, when the terminal reports a TTI supporting downlink 2 OFDM symbols, it should be assumed that reception of 3 OFDM symbols, 4 OFDM symbols, and 7 OFDM symbol short TTI data is also supported by default. Therefore, when the base station can not support the transmission of 2 OFDM symbols, the data transmission of 3, 4 or 7 OFDM symbols can be adopted for the terminal, thereby meeting part of services with low delay requirements. If the terminal reports the TTI that the downlink supports 2 OFDM symbols, and the terminal only supports TTI data processing of 2 OFDM symbols, the terminal can only receive TTI data of 1ms when the base station does not support TTI of 2 OFDM symbols, which results in that the terminal cannot process part of services with low latency requirements, for example, the length of 3, 4, or 7 OFDM symbols can reduce the processing latency of an air interface, and the original processing capability of the terminal cannot be applied, which results in waste. In addition, the shortest TTI lengths supported by the terminals are different, and the cost to the terminals is also different. Some terminals do not need to have the capability of processing 1 or 2 TTIs with the OFDM symbol length according to the use scene conditions, namely, corresponding application does not exist, and at the time, the capability of the terminal supported by the shortest TTI can be lowered, so that the cost of the terminal is reduced. Because the cost of the different downlink shortest TTI length support capabilities to the terminal is different, some terminal users may also choose the downlink shortest TTI processing capability that is not very high in requirement due to cost considerations. In addition, since the downlink shortest TTI processing capability available to the terminal is also limited by the support of the TTI processing capability by the base station, a terminal requiring lower downlink shortest TTI processing capability will also exist, for example, the downlink shortest TTI supporting capability is 4 or 7 OFDM symbols.
To solve the above problem, an embodiment of the present invention further provides a method for reporting a TTI length, fig. 2 is a flowchart of a method for reporting a TTI length according to an embodiment of the present invention, and as shown in fig. 2, the process includes the following steps:
step S202, reporting the shortest TTI length supported by the terminal to the base station, wherein the terminal supports more than two different TTI lengths.
The terminal can report the shortest TTI length supported by the terminal to the base station through the steps, so that the base station can determine more reasonable related information of the downlink available TTI length or the MAC control element according to the shortest TTI length supported by the terminal.
In an optional embodiment, 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 through Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC control element) transmitted by the base station and related to the downlink available TTI length, wherein the information related to the downlink available TTI length or the MAC control element is determined by the base station according to the shortest TTI length; and detecting a control channel according to the related information of the downlink available TTI length or the MAC control element. In this embodiment, the base station determines the information related to the downlink available TTI length, or the MAC control element related to the downlink available TTI length, so as to ensure that the terminal can perform control channel detection according to the information related to the downlink available TTI length determined by the base station, or the MAC control element, thereby reducing the number of unnecessary control channel detections, saving power consumption of the terminal, and avoiding waste of resources. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
In an optional embodiment, the TTI length indicated by the information about the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, the detecting the control channel according to the information related to the available downlink TTI length or the MAC control element includes: determining one or more TTI lengths from more than two 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, wherein the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal; and detecting the control channel according to the determined TTI length.
In an optional embodiment, when the TTI length indicated by the information related to the downlink available TTI length or the MAC control element includes 1ms, performing control channel detection according to the information related to the downlink available TTI length or the MAC control element includes: and performing physical downlink control channel PUCCH detection on one or more symbols with position numbers of 0,1 and 2 in the 1ms subframe according to the downlink available TTI length related information or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, performing control channel detection according to the downlink available TTI length related information or the MAC control element includes: and performing sPDCCH detection at a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element, wherein the sPDCCH is positioned in the downlink available TTI length indicated by the information related to the downlink available TTI length or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 4 or 3 OFDM symbols, performing sPDCCH detection at a specific symbol position in a 1ms subframe according to the downlink available TTI length related information or the MAC control element includes: determining the length of TTI for carrying out the sPDCCH detection from 4 or 3 OFDM symbols according to the position of the sPDCCH in the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element; and carrying out sPDCCH detection according to the determined length of the TTI.
In an optional embodiment, performing sPDCCH detection on a specific symbol position within a 1ms subframe according to the information about the downlink available TTI length or the MAC control element includes at least one of: when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises 1 OFDM symbol, performing sPDCCH detection on one or more symbol positions in symbols occupied by a Physical Downlink Shared Channel (PDSCH) region in a 1ms subframe; when the TTI length related information or the TTI length indicated by the MAC control element comprises 2 OFDM symbols, carrying out sPDCCH detection at one or more symbol positions in 0,1,2, 4, 6, 8, 10 and 12 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises 4 or 3 OFDM symbols, carrying out sPDCCH detection at one or more symbol positions in 0,1,2, 3, 4, 7, 10 and 11 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or MAC control element includes 7 symbols, sPDCCH detection is performed at one or more symbol positions in 0,1,2, 7 within a 1ms subframe.
In an optional embodiment, receiving a MAC control element sent by the base station and related to a downlink available TTI length includes: and receiving an indication value of a logical channel Identification (ID) field positioned in a subheader of a Media Access Control (MAC) Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises 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 current available TTI length of the terminal.
In an optional embodiment, after receiving a MAC control element sent by the base station and related to a downlink available TTI length, the method further includes: and replacing the TTI length currently available by the terminal with the TTI length indicated by the MAC control element after the specific effective time after the MAC control element is received.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length is valid.
In an optional embodiment, the detecting the control channel according to the information related to the length of the downlink available TTI includes: when the validity information indicates that the downlink available TTI length indicated by the downlink available TTI length related information is valid, switching the currently available TTI length of the terminal to the downlink available TTI length indicated by the downlink available TTI length related information after a specific validity time; and detecting the control channel according to the switched downlink available TTI length.
In this embodiment, a MAC control element receiving method is provided, and 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 flowchart includes the following steps:
step S302, receiving an indication value of a logical channel identifier ID field located at a subheader 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, it may be the terminal that performs the above-mentioned operations.
In this embodiment, for a terminal supporting short TTI data reception in downlink, when the base station configures multiple downlink available TTI lengths for the terminal, the base station may switch the TTI length used in the downlink of the terminal by using the MAC control element according to the requirement of the current service on the delay.
In an optional embodiment, the method further includes: and detecting the control channel 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, saving power consumption of the terminal, and avoiding resource waste. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
In an optional embodiment, the MAC PDU is located in a PDSCH or sPDSCH of a physical downlink shared channel, where the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where kbit in the 8 bits is used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element includes a shortest TTI length in a radio resource control RRC connection reconfiguration message; the MAC control element is used to determine the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
In an optional embodiment, the method further includes: and replacing the TTI length currently available by the terminal with the TTI length indicated by the MAC control element after the specific effective time after the MAC control element is received.
Fig. 4 is a flowchart of a second control channel detection method according to an embodiment of the present invention, and as shown in fig. 4, the flowchart includes the following steps:
step S402, configuring information related to the TTI length of the available downlink transmission time interval to the terminal through RRC signaling, or sending a MAC control element related to the TTI length of the available downlink transmission time interval to the terminal, where the information related to the TTI length of the available downlink transmission time interval or the MAC control element is used for the terminal to perform control channel detection.
Wherein, it may be the base station to perform the above operations.
Through the steps, the base station determines the relevant information of the downlink available TTI length, or the MAC control element relevant to the downlink available TTI length, so that the terminal can perform control channel detection according to the relevant information of the downlink available TTI length determined by the base station, or the MAC control element, unnecessary control channel detection times can be reduced, the power consumption of the terminal is saved, and resource waste is avoided. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
In an optional embodiment, the TTI length indicated by the above information on the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, before configuring the information related to the TTI length of the available downlink transmission time interval to the terminal through the RRC signaling, or sending a MAC control element related to the TTI length of the available downlink transmission time interval to the terminal, the method further includes: receiving information of the shortest TTI length supported by the terminal from the terminal; and determining the related information of the downlink available TTI length or the MAC control element according to the information of the shortest TTI length supported by the terminal.
In an optional embodiment, sending a MAC control element associated with a downlink available TTI length to the terminal includes: and sending the MAC control element to the terminal by an indication value of a logical channel Identification (ID) field positioned at the subheader of the MAC Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the mac control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises the shortest TTI length in the RRC connection reconfiguration message; the MAC control element is used for jointly determining the downlink available TTI length of the terminal by the terminal and the current available TTI of the terminal.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length of the terminal is valid.
Fig. 5 is a flowchart of a method for receiving a TTI length, according to an embodiment of the present invention, and as shown in fig. 5, the flowchart includes the following steps:
step S502, receiving the shortest TTI length supported by the terminal reported by the terminal, wherein the terminal supports more than two different TTI lengths.
The base station may perform the above operation, and through the above steps, the shortest TTI length supported by the terminal may be obtained, so that more reasonable information about the downlink available TTI length or the MAC control element may be determined according to the shortest TTI length.
In an optional embodiment, after receiving the shortest TTI length supported by the terminal and reported by the terminal, the method further includes: determining information related to the length of the downlink available TTI or a media access control unit (MAC) control element related to the length of the downlink available TTI according to the shortest TTI length; and configuring information related to the downlink available TTI length to a terminal through Radio Resource Control (RRC) signaling, or sending the MAC control element to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel.
In an optional embodiment, the TTI length indicated by the above information on the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, the sending the MAC control element to the terminal includes: and transmitting the MAC control element to the terminal by using an indication value of a logical channel identification ID field located in a subheader of a MAC protocol data unit PDU, wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where kbit in the 8 bits is used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element includes a shortest TTI length in a radio resource control RRC connection reconfiguration message; the MAC control element is used for jointly determining the downlink available TTI length of the terminal by the terminal and the currently available TTI of the terminal.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length of the terminal is valid.
In an embodiment of the present invention, a MAC control element sending method is further provided, and fig. 6 is a flowchart of the MAC control element sending method according to the embodiment of the present invention, and as shown in fig. 6, the flowchart includes the following steps:
step S606, sending the MAC control element to the terminal according to the indicated value of the logical channel identifier ID field located in the subheader of the MAC protocol data unit PDU, where the indicated value is used to identify the MAC control element.
Wherein, it may be the base station to perform the above operations.
In this embodiment, for a terminal supporting short TTI data reception in downlink, when the base station configures multiple downlink available TTI lengths for the terminal, the base station may switch the TTI length used in the downlink of the terminal by using the MAC control element according to the requirement of the current service on the delay.
In an optional embodiment, the MAC control element is used for the terminal to perform control channel detection.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element includes a shortest TTI length in a radio resource control RRC connection reconfiguration message; the MAC control element is configured to determine a downlink available TTI length of the terminal together with a currently available TTI length of the terminal.
The invention is illustrated below with reference to specific examples:
fig. 7 is a diagram illustrating a table of levels of the capability of supporting TTI lengths in downlink by base stations and terminals in an LTE system supporting transmission in shorter TTIs. In fig. 7, the support capability of the base station and the terminal for the downlink TTI length in the LTE system is shown to be divided into 4 levels. Each higher level increases shorter downlink TTI support capacity than the next lower level, e.g., level L4 increases downlink TTI length for 1 OFDM symbol compared to L3, level L3 increases 2 OFDM symbol processing capacity compared to level L2, and level L2 increases 4 or 3 OFDM symbol processing capacity compared to level L1.
Fig. 8 is a diagram of another class table for supporting the capability of supporting TTI lengths in downlink by a base station and a terminal in an LTE system that supports transmission in shorter TTIs. In fig. 8, the support capability of the base station and the terminal for the downlink TTI length in the LTE system is shown to be divided into 3 levels. Each higher level increases the shorter downlink TTI support capacity compared to the next lower level, e.g., level L3 increases the processing capacity for 2 OFDM symbols compared to level L2, and level L2 increases the processing capacity for 4 or 3 OFDM symbols compared to level L1.
Fig. 9 is an LTE communication system presented in conjunction with a table of TTI length capability levels supported by the base station and the terminal in fig. 7. In fig. 9, UE1 supports the shortest TTI of 2 downlink OFDM symbols, that is, L3 in fig. 7, when the terminal reports 2 OFDM symbols with the shortest downlink supported TTI length of level 3, it means that the terminal also supports 4 or 3 OFDM symbols, 7 symbols, and 1ms TTI length in downlink, UE2 supports the shortest TTI of 7 downlink OFDM symbols, that is, the lowest level L1 in fig. 7, and when the terminal reports 7 OFDM symbols with the shortest downlink supported TTI length of level 1, the terminal also supports 1ms TTI in downlink.
In fig. 9, the base station supports the shortest TTI of 4 or 3 OFDM symbols in downlink, and for terminal UE1, the base station configures, by using dedicated radio resource configuration information element in RRC connection reconfiguration message, that the downlink available TTI length includes 4 or 3 OFDM symbols, so that UE1 performs sPDCCH control channel detection on one or more symbols of positions 0,1,2, 3, 4, 7, 10, 11 in a 1ms subframe, where the above-described downlink available TTI length includes 4 or 3 OFDM symbols indicating that the terminal can receive TTI length data of 4 or 3 OFDM symbols, and the terminal determines, according to the symbol position of detected sPDCCH in the 1ms subframe, that the TTI length is one of 4 or 3 OFDM symbols, such as sPDCCH detected at symbol positions 0,1,2, and the TTI length is 4, and the sPDCCH detected at symbol position 4 is 3. As shown in fig. 10.
For terminal UE2, the base station configures the available downlink TTI length to include 7 OFDM symbols by using the dedicated radio resource configuration information element in the RRC connection reconfiguration message, so that UE2 performs sPDCCH control channel detection on one or more symbols of positions 0,1,2, and 7 in a 1ms subframe, as shown in fig. 11.
Similarly, for an LTE system that supports transmission in a shorter TTI, if the terminal is configured via the RRC connection reconfiguration message that the downlink available TTI length includes 1 OFDM symbol, then the terminal will perform sPDCCH control channel detection on one or more of the downlink PDSCH data channel region occupied symbols within the 1ms subframe, and if the terminal is configured via the RRC connection reconfiguration message that the downlink available TTI length includes 2 OFDM symbols, then the terminal will perform sPDCCH control channel detection on one or more of the position numbers 0,1,2, 4, 6, 8, 10, 12 within the 1ms subframe.
In addition, when the terminal is reconfigured from downlink to include 1ms TTI with data received with a TTI length of 7 OFDM symbols, the terminal will perform PDCCH control channel detection on one or more symbols numbered 0,1,2 within the 1ms subframe.
In the embodiment of the present invention, as shown in fig. 9, the base station supports the shortest TTI of 4 or 3 OFDM symbols in downlink, and for terminal UE1, the base station configures, through the dedicated radio resource configuration information element in the RRC connection reconfiguration message, that the downlink available TTI length includes 4 or 3 OFDM symbols and 7 OFDM symbols. Therefore, the base station can indicate which downlink available TTI length is effective through the MAC control element according to the requirement of the service. Similarly, for the terminal UE2, the base station configures the downlink available TTI length including 7 OFDM symbols through the dedicated radio resource configuration information element in the RRC connection reconfiguration message, and the base station may indicate whether the downlink 7 OFDM available TTI length is valid through the MAC control element according to the needs of the service.
Fig. 12 is a schematic diagram of a logical channel field indication value of a MAC control element in a MAC PDU subheader for indicating a downlink available TTI length. Assuming that the size of the MAC control element is 0, the UE2 may be switched from supporting 1ms TTI to 7 OFDM symbol TTIs and also from 7 OFDM symbol TTIs to 1ms TTI through the TTI switch command in fig. 12, that is, for a terminal supporting a short TTI length in downlink, the terminal may be switched between a short TTI length and a 1ms TTI length through the TTI switch command, and after receiving the TTI switch command, the terminal may be switched to support 1ms TTI in downlink if the short TTI length currently available to the terminal is 1ms TTI, and after receiving the TTI switch command, the terminal may be switched to support short TTI in downlink. For a terminal supporting multiple short TTIs in downlink, a method can also be adopted, namely, no matter which TTI length is adopted in the current downlink, after the TTI switch command is received, the TTI is switched to 1ms TTI.
Fig. 13 is a diagram illustrating a MAC control element for indicating information on the TTI length available to the terminal. The MAC control element consists of 8 bits, wherein 4 bits are used to indicate the terminal available TTI length (the 4 bits listed here are only a preferred way, and other lengths can be used to indicate the terminal available TTI length, for example, 2-bit indication or 6-bit indication), and the remaining 4 bits are reserved bits.
In this embodiment of the present invention, as shown in fig. 9, a base station supports a shortest TTI of 4 or 3 OFDM symbols in downlink, and for a terminal UE1, the base station configures, through a dedicated radio resource configuration information element in an RRC connection reconfiguration message, that downlink available TTI lengths include 4 or 3 OFDM symbols and 7 OFDM symbols, and since a current service does not need to configure both of the available TTI lengths to be invalid, when a service needs a lower air interface delay, some of the TTI lengths may take effect through reconfiguration.
It should be noted that the method in each of the above embodiments is described as an example of configuring the downlink available TTI length of the terminal, and the method in each of the above embodiments may also be applied to configuring the uplink available TTI length of the terminal.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a control channel detection device, a reporting device of TTI length of transmission time interval, a MAC control element receiving device, a receiving device of TTI length, and a MAC control element transmitting device are also provided, and the devices are used to implement the foregoing embodiments and preferred embodiments, and are not described again after having been described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 14 is a block diagram of a first control channel detection apparatus according to an embodiment of the present invention, and as shown in fig. 14, the apparatus includes a first receiving module 142 and a detecting module 144, and the apparatus is described as follows:
a first receiving module 142, configured to receive information related to a downlink available transmission time interval TTI length configured by a base station through a radio resource control RRC signaling or receive a media access control unit MAC control element sent by the base station and related to the downlink available TTI length; a detecting module 144, connected to the first receiving module 142, for detecting a control channel according to the information related to the available downlink TTI length or the MAC control element.
In an optional embodiment, the TTI length indicated by the above information on the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, the detecting module 144 may perform control channel detection according to the information related to the downlink available TTI length or the MAC control element in the following manner: determining one or more TTI lengths from more than two TTI lengths supported by the terminal according to the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element, wherein the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal; and detecting the control channel according to the determined TTI length. In this embodiment, the downlink may indicate one or more TTI lengths according to the TTI length related information, and the MAC control element may indicate one or more TTI lengths.
In an alternative embodiment, the plurality of TTI lengths include one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, and in this embodiment, the plurality of TTI lengths may be two TTI lengths, one of the two TTI lengths is 1ms, and the other is one of the four lengths.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 1ms, the detecting module 144 may perform control channel detection according to the downlink available TTI length related information or the MAC control element by: and performing physical downlink control channel PUCCH detection on one or more symbols with position numbers of 0,1 and 2 in the 1ms subframe according to the downlink available TTI length related information or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, the detecting module 144 may perform control channel detection according to the downlink available TTI length related information or the MAC control element by: and performing sPDCCH detection at a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element, wherein the sPDCCH is positioned in the downlink available TTI length indicated by the information related to the downlink available TTI length or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 4 or 3 OFDM symbols, the detecting module 144 may perform sPDCCH detection at a specific symbol position in a 1ms subframe according to the downlink available TTI length related information or the MAC control element in the following manner: determining the length of TTI for carrying out the sPDCCH detection from 4 or 3 OFDM symbols according to the position of the sPDCCH in the downlink available TTI length related information or the downlink available TTI length indicated by the MACcontrol element; and carrying out sPDCCH detection according to the determined length of the TTI.
In an optional embodiment, the detecting module 144 may perform sPDCCH detection on a specific symbol position within a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element by at least one of the following manners: when the TTI length related information of the downlink available TTI length or the TTI length indicated by the MAC control element comprises 1 OFDM symbol, carrying out the sPDCCH detection on one or more symbol positions in the symbols occupied by the physical downlink shared channel PDSCH region in the 1ms subframe; when the TTI length related information or the TTI length indicated by the MAC control element comprises 2 OFDM symbols, carrying out sPDCCH detection at one or more symbol positions in 0,1,2, 4, 6, 8, 10 and 12 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises 4 or 3 OFDM symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2, 3, 4, 7, 10, 11 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or MAC control element includes 7 symbols, sPDCCH detection is performed at one or more symbol positions in 0,1,2, 7 within a 1ms subframe.
In an optional embodiment, the apparatus further includes a downlink available TTI length reporting module, where the downlink available TTI length reporting module is configured to report a shortest TTI length supported by the terminal to the base station before receiving information related to a downlink available TTI length configured by the base station through radio resource control RRC signaling or receiving a MAC control element sent by the base station and related to the downlink available TTI length, where the shortest TTI length supported by the terminal is used for the base station to determine the information related to the downlink available TTI length or the MAC control element. In this embodiment, the terminal may report, through the Capability reporting message UE Capability Information, that the downlink supports the shortest TTI length, where the downlink of the terminal may support M TTIs with different lengths, where M is greater than 1, a value range of the TTI length is less than or equal to 1ms, the M TTI lengths include 1ms TTI, and the shortest TTI length is a minimum value of the M TTI lengths supported by the downlink of the terminal.
In an optional embodiment, the first receiving module 142 may receive a MAC control element, which is sent by the base station and is related to a downlink available TTI length, by: and receiving an indication value of a logical channel Identification (ID) field positioned in a subheader of a Media Access Control (MAC) Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or sPDSCH of a physical downlink shared channel, where the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where kbit of the 8 bits is used to indicate one or more downlink available TTI lengths, the remaining bits (i.e., the remaining (8-k) bits) are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises 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 current available TTI length of the terminal.
In an optional embodiment, the apparatus further includes a first replacing module, configured to replace, after receiving a MAC control element sent by the base station and related to a downlink available TTI length, the currently available TTI length of the terminal with the downlink available TTI length indicated by the MAC control element after receiving a specific validation time after the MAC control element is received.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length is valid.
In an optional embodiment, the detecting module 144 may perform control channel detection according to the information related to the length of the downlink available TTI in the following manner: when the information indicating whether the valid information indicates that the downlink available TTI length indicated by the information related to the downlink available TTI length is valid, switching the currently available TTI length to the downlink available TTI length indicated by the information related to the downlink available TTI length after a specific valid time; and detecting the control channel according to the switched downlink available TTI length.
Fig. 15 is a block diagram of an apparatus for reporting a TTI length according to an embodiment of the present invention, and as shown in fig. 15, the apparatus includes a reporting module 152.
A reporting module 152, configured to report the shortest TTI length supported by the terminal to the base station, where the terminal supports more than two different TTI lengths.
In an optional embodiment, the apparatus further includes a first processing module, configured to receive, after reporting the shortest TTI length supported by the terminal to a base station, information related to a downlink available TTI length configured by the base station through radio resource control RRC signaling or a media access control unit MAC control element sent by the base station and related to the downlink available TTI length, where the information related to the downlink available TTI length or the MAC control element is determined by the base station according to the shortest TTI length; and detecting a control channel according to the related information of the downlink available TTI length or the MAC control element. In this embodiment, the base station determines the information related to the downlink available TTI length, or the MAC control element related to the downlink available TTI length, so as to ensure that the terminal can perform control channel detection according to the information related to the downlink available TTI length determined by the base station, or the MAC control element, thereby reducing the number of unnecessary control channel detections, saving power consumption of the terminal, and avoiding waste of resources. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
In an optional embodiment, the TTI length indicated by the information about the available downlink TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, the first processing module may perform control channel detection according to the information related to the downlink available TTI length or the MAC control element in the following manner: determining one or more TTI lengths from more than two 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, wherein the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal; and detecting the control channel according to the determined TTI length.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 1ms, the first processing module may perform control channel detection according to the downlink available TTI length related information or the MAC control element by: and performing physical downlink control channel PUCCH detection on one or more symbols with position numbers of 0,1 and 2 in the 1ms subframe according to the downlink available TTI length related information or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, the first processing module may perform control channel detection according to the downlink available TTI length related information or the MAC control element by: and performing sPDCCH detection at a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element, wherein the sPDCCH is positioned in the downlink available TTI length indicated by the information related to the downlink available TTI length or the MAC control element.
In an optional embodiment, when the TTI length indicated by the downlink available TTI length related information or the MAC control element includes 4 or 3 OFDM symbols, the first processing module may perform sPDCCH detection at a specific symbol position in a 1ms subframe according to the downlink available TTI length related information or the MAC control element in the following manner: determining the length of TTI for carrying out the sPDCCH detection from 4 or 3 OFDM symbols according to the position of the sPDCCH in the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element; and carrying out 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 1ms subframe according to the information related to the downlink available TTI length or the MAC control element in at least one of the following manners: when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises 1 OFDM symbol, performing sPDCCH detection on one or more symbol positions in symbols occupied by a Physical Downlink Shared Channel (PDSCH) region in a 1ms subframe; when the TTI length related information or the TTI length indicated by the MAC control element comprises 2 OFDM symbols, carrying out sPDCCH detection at one or more symbol positions in 0,1,2, 4, 6, 8, 10 and 12 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises 4 or 3 OFDM symbols, carrying out sPDCCH detection at one or more symbol positions in 0,1,2, 3, 4, 7, 10 and 11 in a 1ms subframe; when the TTI length indicated by the downlink available TTI length related information or MAC control element includes 7 symbols, sPDCCH detection is performed at one or more symbol positions in 0,1,2, 7 within a 1ms subframe.
In an optional embodiment, the first processing module may receive a MAC control element, which is sent by the base station and is related to a downlink available TTI length, in the following manner: and receiving an indication value of a logical channel Identification (ID) field positioned in a subheader of a Media Access Control (MAC) Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises 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 current available TTI length of the terminal.
In an optional embodiment, the apparatus further includes a second replacing module, configured to replace, after receiving a MAC control element sent by the base station and related to a downlink available TTI length, the currently available TTI length of the terminal with the TTI length indicated by the MAC control element after receiving a specific validation time after the MAC control element is received.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length is valid.
In an optional embodiment, the first processing module may perform control channel detection according to the information related to the downlink available TTI length by: when the validity information indicates that the downlink available TTI length indicated by the downlink available TTI length related information is valid, switching the currently available TTI length of the terminal to the downlink available TTI length indicated by the downlink available TTI length related information after a specific validity time; and detecting the control channel according to the switched downlink available TTI length.
Fig. 16 is a block diagram of a MAC control element receiving apparatus according to an embodiment of the present invention, and as shown in fig. 16, the apparatus includes a second receiving module 162, and the apparatus is explained as follows:
a second receiving module 162, configured to receive an indication value of a logical channel identifier ID field located in a subheader of a MAC protocol data unit PDU, where the indication value is used to identify the MAC control element, and the MAC control element is related to a downlink available TTI length.
In an optional embodiment, the apparatus further includes a second processing module, where the second processing module is 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, saving power consumption of the terminal, and avoiding resource waste. The problem of need carry out control channel detection on every symbol in the correlation technique, cause power consumption big, lead to the wasting of resources is solved, and then reached and saved the electric quantity consumption, avoided the wasting of resources's effect.
In an optional embodiment, the MAC PDU is located in a PDSCH or sPDSCH of a physical downlink shared channel, where the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where kbit in the 8 bits is used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element includes a shortest TTI length in a radio resource control RRC connection reconfiguration message; the MAC control element is used to determine the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
In an optional embodiment, the apparatus further includes a third replacing module, configured to replace a currently available TTI length of the terminal with a TTI length indicated by the MAC control element after a specific validation time after the MAC control element is received.
Fig. 17 is a block diagram of a second control channel detection apparatus according to an embodiment of the present invention, which includes a processing module 172 as shown in fig. 17, and is described below.
A processing module 172, configured to configure information related to a downlink available TTI length to a terminal through a radio resource control RRC signaling, or send a MAC control element related to the downlink available TTI length 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.
In an optional embodiment, the TTI length indicated by the above information on the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, the apparatus further includes a third processing module, configured to receive, before configuring, by the RRC signaling, information related to the TTI length of the downlink available transmission time interval to a terminal, or sending, to the terminal, a MAC control element related to the TTI length of the downlink available transmission time interval, shortest TTI length information supported by the terminal from the terminal; and determining the related information of the downlink available TTI length or the MAC control element according to the information of the shortest TTI length supported by the terminal.
In an optional embodiment, the processing module 172 may send a MAC control element related to a downlink available TTI length to the terminal as follows: and sending the MAC control element to the terminal by an indication value of a logical channel Identification (ID) field positioned at the subheader of the MAC Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, and the remaining bits are reserved bits, where 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element comprises the shortest TTI length in the RRC connection reconfiguration message; the MAC control element is used for jointly determining the downlink available TTI length of the terminal by the terminal and the current available TTI of the terminal.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length of the terminal is valid.
Fig. 18 is a block diagram of a receiving apparatus of TTI length according to an embodiment of the present invention, and as shown in fig. 18, the apparatus includes a third receiving module 182, which is described below:
a third receiving module 182, configured to receive the shortest TTI length supported by the terminal, where the terminal supports more than two different TTI lengths.
In an optional embodiment, the apparatus further includes a fourth processing module, configured to determine, after receiving a shortest TTI length supported by the terminal and reported by the terminal, information related to a downlink available TTI length or a MAC control element related to the downlink available TTI length according to the shortest TTI length; and configuring information related to the downlink available TTI length to a terminal through Radio Resource Control (RRC) signaling, or sending the MAC control element to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel.
In an optional embodiment, the TTI length indicated by the above information on the downlink available TTI length or the MAC control element is less than or equal to 1ms, where the 1ms subframe includes 14 symbols, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
In an optional embodiment, the fourth processing module may send the MAC control element to the terminal by: and transmitting the MAC control element to the terminal by using an indication value of a logical channel identification ID field located in a subheader of a MAC protocol data unit PDU, wherein the indication value is used for identifying the MAC control element.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where k bits of the 8 bits are used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element includes a shortest TTI length in a radio resource control RRC connection reconfiguration message; the MAC control element is used for jointly determining the downlink available TTI length of the terminal by the terminal and the currently available TTI of the terminal.
In an optional embodiment, the 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 information element of the RRC connection reconfiguration message.
In an optional embodiment, the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, where the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length of the terminal is valid.
Fig. 19 is a block diagram of a MAC control element transmission apparatus according to an embodiment of the present invention, and as shown in fig. 19, the apparatus includes a transmission module 192, which is explained below:
a sending module 192, configured to send the MAC control element to the terminal through an indication value of a logical channel identifier ID field located in a subheader of the MAC PDU, where the indication value is used to identify the MAC control element.
In an optional embodiment, the MAC control element is used for the terminal to perform control channel detection.
In an optional embodiment, the MAC PDU is located in a PDSCH or an sPDSCH of a physical downlink shared channel, and the PDSCH or the sPDSCH is located within a currently available TTI length of a terminal.
In an alternative embodiment, the size of the MAC control element is 0; or, the size of the MAC control element is 8 bits, where kbit in the 8 bits is used to indicate one or more downlink available TTI lengths, the remaining bits are reserved bits, and 0< k < 8.
In an alternative embodiment, when the size of the MAC control element is 0, one of the following is included: the TTI length indicated by the MAC control element is 1 ms; the TTI length indicated by the MAC control element includes 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols; the TTI length indicated by the MAC control element includes a shortest TTI length in a radio resource control RRC connection reconfiguration message; the MAC control element is configured to determine a downlink available TTI length of the terminal together with a currently available TTI length of the terminal.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, receiving information related to a TTI length of a downlink available transmission time interval configured by a base station through Radio Resource Control (RRC) signaling or receiving a MAC control element sent by the base station and related to the TTI length of the downlink available transmission time interval;
and S2, detecting the control channel according to the information of the downlink available TTI length or the MAC control element.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
and S1, reporting the shortest TTI length supported by the terminal to the base station, wherein the terminal supports more than two different TTI lengths.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
s1, receiving an indication value of a logical channel identifier ID field in a subheader 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.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
s1, configuring information related to the TTI length to the terminal through RRC signaling, or sending a MAC control element related to the TTI length to the terminal, where the information or the MAC control element is used for detecting the control channel by the terminal.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
and S1, receiving the shortest TTI length supported by the terminal reported by the terminal, wherein the terminal supports more than two different TTI lengths.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
s1, sending the MAC control element to the terminal according to the indicated value of the logical channel ID field in the subheader of the MAC PDU, wherein the indicated value is used to identify the MAC control element.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Optionally, in this embodiment, the processor executes the above steps according to program codes stored in the storage medium.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
By the embodiment, the terminal supporting the shorter TTI length in the downlink can obtain the maximum supporting capability in the existing commercial LTE network, the flexibility is improved, and the reported information is less.
In addition, the terminal can switch from 1ms TTI to shorter TTI transmission or from shorter TTI to 1ms TTI according to the requirement of downlink service on time delay, thereby achieving the purpose of balancing time delay and controlling overhead. The terminal receives the information of the length of the downlink available TTI configured by the base station and detects the control channel based on the information, so that the detection times of the terminal can be reduced, and the aim of saving the power consumption is fulfilled.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (44)

1. A method for control channel detection, comprising:
receiving information related to the length of a downlink available Transmission Time Interval (TTI) configured by a base station through Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC control element) related to the length of the downlink available TTI sent by the base station;
detecting a control channel according to the relevant information of the downlink available TTI length or the MAC control element;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
2. The method of claim 1, wherein the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, and wherein 14 symbols are included in a 1ms subframe, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
3. The method of claim 2, wherein the performing control channel detection according to the information related to the downlink available TTI length or the MAC control element comprises:
determining one or more TTI lengths from more than two TTI lengths supported by a terminal according to the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element, wherein the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal;
and detecting the control channel according to the determined TTI length.
4. The method of claim 3, wherein the plurality of TTI lengths comprises one of 1ms and 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols.
5. The method according to claim 3 or 4, wherein when the TTI length related information or the MAC control element indicated by the downlink available TTI length information comprises 1ms, performing control channel detection according to the downlink available TTI length related information or the MAC control element comprises:
and carrying out physical downlink control channel PUCCH detection on one or more symbols with the position numbers of 0,1 and 2 in a 1ms subframe according to the downlink available TTI length related information or the MAC control element.
6. The method of claim 3 or 4, wherein when the TTI length indicated by the downlink available TTI length related information or the MAC control element comprises one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols, and 7 OFDM symbols, the performing control channel detection according to the downlink available TTI length related information or the MAC control element comprises:
and performing short physical downlink control channel (sPDCCH) detection on a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element, wherein the sPDCCH is positioned in the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element.
7. The method of claim 6, wherein when the TTI length related information available in the downlink or the TTI length indicated by the MAC control element comprises 4 or 3 OFDM symbols, performing sPDCCH detection at a specific symbol position in a 1ms subframe according to the TTI length related information available in the downlink or the MAC control element comprises:
determining the length of TTI for carrying out the sPDCCH detection from the 4 or 3 OFDM symbols according to the position of the sPDCCH in the downlink available TTI length related information or the downlink available TTI length indicated by the MAC control element;
and carrying out the sPDCCH detection according to the determined length of the TTI.
8. The method of claim 6, wherein performing the sPDCCH detection on a specific symbol position in a 1ms subframe according to the information related to the downlink available TTI length or the MAC control element comprises at least one of:
when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 1 OFDM symbol, performing the sPDCCH detection on one or more symbol positions in symbols occupied by a Physical Downlink Shared Channel (PDSCH) region in a 1ms subframe;
when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 2 OFDM symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2, 4, 6, 8, 10, 12 in a 1ms subframe;
when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 4 or 3 OFDM symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2, 3, 4, 7, 10, 11 in a 1ms subframe;
and when the information related to the downlink available TTI length or the TTI length indicated by the MAC control element comprises 7 symbols, performing the sPDCCH detection at one or more symbol positions in 0,1,2 and 7 in a 1ms subframe.
9. The method of claim 1, wherein before receiving information related to a downlink available TTI length configured by the base station through the RRC signaling or receiving the MAC control element related to the downlink available TTI length sent by the base station, the method further comprises:
and reporting the shortest TTI length supported by the terminal to the base station, wherein the shortest TTI length supported by the terminal is used for the base station to determine the information related to the downlink available TTI length or the MAC control element.
10. The method of claim 1, wherein receiving the MAC control element associated with a downlink available TTI length sent by the base station comprises:
receiving an indication value of a logical channel Identification (ID) field located in a subheader of a MAC Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element.
11. The method of claim 10, wherein the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, and wherein the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
12. The method of claim 11, wherein when the size of the MAC control element is 0, the method further comprises one of:
the TTI length indicated by the MAC control element is 1 ms;
the TTI length indicated by the MAC control element comprises 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols;
the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message;
the MAC control element is used for determining the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
13. The method according to any of claims 1 to 12, wherein after receiving the MAC control element sent by the base station and related to the downlink available TTI length, the method further comprises:
and 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 the MAC control element is received.
14. The method of claim 1, wherein the RRC signaling comprises an RRC connection reconfiguration message, and wherein the information related to the downlink available TTI length is located in a dedicated radio resource configuration information element of the RRC connection reconfiguration message.
15. The method of claim 14, wherein the RRC connection reconfiguration message further includes information about whether to be valid corresponding to the downlink available TTI length, wherein the information about whether to be valid is used to indicate whether the downlink available TTI length indicated by the information about the downlink available TTI length is valid.
16. The method of claim 15, wherein performing control channel detection according to the information related to the downlink available TTI length comprises:
when the information indicating whether to take effect indicates that the downlink available TTI length indicated by the information related to the downlink available TTI length takes effect, switching the currently available TTI length to the downlink available TTI length indicated by the information related to the downlink available TTI length after a specific effective time;
and detecting the control channel according to the switched downlink available TTI length.
17. A method for reporting Transmission Time Interval (TTI) length is characterized in that the method comprises the following steps:
reporting the shortest TTI length supported by a terminal to a base station, wherein the terminal supports more than two different TTI lengths;
receiving downlink available TTI length related information configured by the base station through Radio Resource Control (RRC) signaling or receiving a media access control unit (MAC) control element which is sent by the base station and is related to the downlink available TTI length, wherein the downlink available TTI length related information or the MAC control element is determined by the base station according to the shortest TTI length;
detecting a control channel according to the relevant information of the downlink available TTI length or the MAC control element;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
18. The method of claim 17, wherein the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, and wherein 14 symbols are included in a 1ms subframe, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
19. The method of claim 18, wherein performing control channel detection according to the information related to the downlink available TTI length or the MAC control element comprises:
determining one or more TTI lengths from more than two TTI lengths supported by a terminal according to the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element, wherein the information related to the downlink available TTI length or the downlink available TTI length indicated by the MAC control element is one or more than two TTI lengths supported by the terminal;
and detecting the control channel according to the determined TTI length.
20. A method for receiving a media access control element (MAC) control element, comprising:
receiving an indication value of a logical channel Identification (ID) field at the subheader of a Protocol Data Unit (PDU), wherein the indication value is used for identifying the MAC control element, and the MAC control element is related to the length of a downlink available Transmission Time Interval (TTI);
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
21. The method of claim 20, further comprising:
and detecting a control channel according to the MAC control element.
22. The method of claim 20, wherein the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, and wherein the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
23. The method of claim 20, wherein when the size of the MAC control element is 0, the method further comprises one of:
the TTI length indicated by the MAC control element is 1 ms;
the TTI length indicated by the MAC control element is 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols;
the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message;
the MAC control element is used for determining the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
24. The method of any one of claims 20 to 23, further comprising:
and replacing the TTI length currently available for the terminal with the TTI length indicated by the MAC control element after the specific effective time after the MAC control element is received.
25. A method for control channel detection, comprising:
configuring information related to a downlink available Transmission Time Interval (TTI) length to a terminal through Radio Resource Control (RRC) signaling, or sending a Media Access Control (MAC) control element related to the downlink available TTI length to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to perform control channel detection;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
26. The method of claim 25, wherein the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, and wherein 14 symbols are included in a 1ms subframe, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
27. The method of claim 25, wherein before configuring the information related to the downlink available Transmission Time Interval (TTI) length to a terminal through the RRC signaling or sending the MAC control element related to the downlink available TTI length to the terminal, the method further comprises:
receiving information of the shortest TTI length supported by the terminal from the terminal;
and determining the relevant information of the downlink available TTI length or the MAC control element according to the shortest TTI length information supported by the terminal.
28. The method of claim 25, wherein sending the MAC control element associated with the downlink available TTI length to the terminal comprises:
and sending the MAC control element to the terminal through an indicated value of a logical channel Identification (ID) field positioned at the subheader of a MAC Protocol Data Unit (PDU), wherein the indicated value is used for identifying the MAC control element.
29. The method of claim 28, wherein the MAC PDU is located in a physical downlink shared channel PDSCH or a short physical downlink shared channel sPDSCH, and wherein the PDSCH or sPDSCH is located within a TTI length currently available to the terminal.
30. The method of claim 25, wherein when the size of the MAC control element is 0, the method further comprises one of:
the TTI length indicated by the MAC control element is 1 ms;
the TTI length indicated by the MAC control element comprises 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols;
the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message;
and the MAC control element is used for jointly determining the downlink available TTI length of the terminal by the terminal and the current available TTI of the terminal.
31. The method of claim 25, wherein the RRC signaling comprises an RRC connection reconfiguration message, and wherein the information related to the downlink available TTI length is located in a dedicated radio resource configuration information element of the RRC connection reconfiguration message.
32. The method of claim 31, wherein the RRC connection reconfiguration message further includes information of whether to take effect corresponding to the downlink available TTI length, wherein the information of whether to take effect is used to indicate whether the downlink available TTI length indicated by the information related to the downlink available TTI length of the terminal is taken effect.
33. A method for receiving a TTI length, comprising:
receiving the shortest TTI length supported by the terminal reported by the terminal, wherein the terminal supports more than two different TTI lengths;
determining information related to the downlink available TTI length or a media access control unit (MAC) control element related to the downlink available TTI length according to the shortest TTI length;
configuring the information related to the downlink available TTI length to a terminal through Radio Resource Control (RRC) signaling, or sending the MAC control element to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
34. The method of claim 33, wherein after receiving the shortest TTI length supported by the terminal reported by the terminal, the method further comprises:
determining information related to the downlink available TTI length or a media access control unit (MAC) control element related to the downlink available TTI length according to the shortest TTI length;
and configuring the information related to the downlink available TTI length to a terminal through Radio Resource Control (RRC) signaling, or sending the MAC control element to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel.
35. The method of claim 34, wherein the TTI length indicated by the downlink available TTI length related information or the MAC control element is less than or equal to 1ms, and wherein 14 symbols are included in a 1ms subframe, and the 14 symbols are numbered 0,1,2, and … 13, respectively.
36. A method for sending a media access control element (MAC) control element is characterized by comprising the following steps:
sending a MAC control element to a terminal through an indicated value of a logical channel Identification (ID) field positioned at the subheader of a MAC Protocol Data Unit (PDU), wherein the indicated value is used for identifying the MAC control element;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
37. The method of claim 36, wherein the MAC control element is used for control channel detection by the terminal.
38. The method of claim 36, wherein the MAC PDU is located in a physical downlink shared channel, PDSCH, or sPDSCH that is located within a TTI length currently available to the terminal.
39. The method of claim 36, wherein when the size of the MAC control element is 0, the method further comprises one of:
the TTI length indicated by the MAC control element is 1 ms;
the TTI length indicated by the MAC control element is 1ms and one of 1 OFDM symbol, 2 OFDM symbols, 4 or 3 OFDM symbols and 7 OFDM symbols;
the TTI length indicated by the MAC control element comprises the shortest TTI length in a Radio Resource Control (RRC) connection reconfiguration message;
the MAC control element is used for determining the downlink available TTI length of the terminal together with the current available TTI length of the terminal.
40. A control channel detection apparatus, comprising:
a first receiving module, configured to receive information related to a downlink available Transmission Time Interval (TTI) length configured by a base station through Radio Resource Control (RRC) signaling or receive a media access control unit (MAC) control element related to the downlink available TTI length sent by the base station;
a detection module, configured to perform control channel detection according to the information related to the downlink available TTI length or the MAC control element;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
41. An apparatus for reporting a Transmission Time Interval (TTI) length, comprising:
a reporting module, configured to report the shortest TTI length supported by a terminal to a base station, where the terminal supports more than two different TTI lengths;
a second receiving module, configured to receive an indication value of a logical channel identifier ID field located in a subheader 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 MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
42. A control channel detection apparatus, comprising:
a processing module, configured to configure information related to a downlink available Transmission Time Interval (TTI) length to a terminal through Radio Resource Control (RRC) signaling, or send a media access control element (MAC) control element related to the downlink available TTI length 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;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
43. A receiving apparatus for a TTI length, comprising:
a third receiving module, configured to receive a shortest TTI length supported by a terminal, where the terminal supports more than two different TTI lengths;
the device is also used for determining the information related to the downlink available TTI length or the media access control element (MAC) control element related to the downlink available TTI length according to the shortest TTI length; configuring the information related to the downlink available TTI length to a terminal through Radio Resource Control (RRC) signaling, or sending the MAC control element to the terminal, wherein the information related to the downlink available TTI length or the MAC control element is used for the terminal to detect a control channel;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
44. A medium access control unit MAC control element transmission apparatus, comprising:
a sending module, configured to send a MAC control element to a terminal through an indication value of a logical channel identifier ID field located in a subheader of a MAC protocol data unit PDU, where the indication value is used to identify the MAC control element;
wherein the MAC control element comprises one of: the size of the MAC control element is 0; the size of the MAC control element is 8 bits, wherein k bits in the 8 bits are used for indicating the length of one or more downlink available TTIs, the rest bits are reserved bits, and 0< k < 8.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101174886A (en) * 2006-10-30 2008-05-07 华为技术有限公司 Method, system and user's set for setting transmission time spacing of reinforced special channel
CN101193438A (en) * 2006-11-30 2008-06-04 华为技术有限公司 A method for realizing high-speed downlink packet access
CN101507324A (en) * 2006-06-19 2009-08-12 株式会社Ntt都科摩 Base station, mobile station, and communication method
WO2016029736A1 (en) * 2014-08-26 2016-03-03 华为技术有限公司 Data transmission method, user equipment and base station

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2416963B (en) * 2004-08-06 2009-05-20 Samsung Electronics Co Ltd Telecommunications methods and apparatus
US20090268707A1 (en) * 2008-04-25 2009-10-29 Interdigital Patent Holdings, Inc. Method to implement transmission time interval bundling
CN102202326B (en) * 2011-05-30 2014-06-11 上海华为技术有限公司 Detection method, detection control apparatus for uplink feedback signaling, and base station
WO2014166122A1 (en) * 2013-04-12 2014-10-16 华为技术有限公司 Method and device for transmitting dedicated channel data

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101507324A (en) * 2006-06-19 2009-08-12 株式会社Ntt都科摩 Base station, mobile station, and communication method
CN101174886A (en) * 2006-10-30 2008-05-07 华为技术有限公司 Method, system and user's set for setting transmission time spacing of reinforced special channel
CN101193438A (en) * 2006-11-30 2008-06-04 华为技术有限公司 A method for realizing high-speed downlink packet access
WO2016029736A1 (en) * 2014-08-26 2016-03-03 华为技术有限公司 Data transmission method, user equipment and base station

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