CN109495923B - CCA detection method, device, storage medium and terminal - Google Patents
CCA detection method, device, storage medium and terminal Download PDFInfo
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- CN109495923B CN109495923B CN201710812144.0A CN201710812144A CN109495923B CN 109495923 B CN109495923 B CN 109495923B CN 201710812144 A CN201710812144 A CN 201710812144A CN 109495923 B CN109495923 B CN 109495923B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
Abstract
The invention discloses a CCA detection method, a device, a storage medium and a terminal, wherein the method comprises the following steps: a terminal acquires CCA detection delay time from a base station; the terminal detects whether the data volume of the data to be sent reaches a preset data volume threshold value; and under the condition of reaching a preset data volume threshold, performing CCA detection on the subframe of the uplink physical control channel within the CCA detection delay time. The invention enables the unauthorized carrier to carry out uplink work, and the CCA detection is carried out by the terminal side, the whole process is simple, convenient and easy, the system performance is improved, and the problem that the CCA detection can not be carried out by the terminal side before the terminal side sends the uplink data because the unauthorized carrier does not support the uplink work is solved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a CCA detection method, apparatus, storage medium, and terminal.
Background
With the rapid development of Long Term Evolution (LTE) networks, the LTE system currently operating on authorized carriers is limited by frequency band resources and cannot meet the development of subsequent networks. Therefore, LTE is deployed in the unlicensed carrier to share the data amount of the Licensed carrier through the unlicensed carrier, that is, the unlicensed carrier operates under the LTE system in a carrier aggregation manner, which is called Licensed-assisted Access (LAA).
However, currently, multiple systems of the unlicensed carrier operate on the same frequency spectrum, such as WIFI and military radar. Therefore, Channel detection, i.e., Clear Channel Assessment (CCA), is required when using an unlicensed carrier. And when the detection result is idle, the unauthorized carrier wave can be used, and if the detection result is busy, the interception is continued or the interception is carried out on the next transmission frame.
Existing CCA detection is divided into two categories: one for Frame-based devices (FBE) and the other for Load-based devices (LBE). The FBE has a fixed transmission frame structure, the channel occupation time and the idle period form a fixed frame period, the equipment carries out CCA detection in the idle period, when the channel is detected to be idle, data transmission can be carried out immediately, otherwise, CCA detection is carried out in the idle period of the next fixed frame period.
Currently, the unlicensed carrier only works in downlink, that is, CCA detection is performed by the network side. The network side determines whether to send downlink data according to the CCA detection result, however, the unlicensed carrier does not support uplink operation, and therefore the terminal side cannot perform CCA detection before the terminal side sends uplink data.
Disclosure of Invention
The invention provides a CCA detection method, a device, a storage medium and a terminal, which at least solve the problem that CCA detection cannot be performed by a terminal side before the terminal side sends uplink data because uplink work is not supported on an unauthorized carrier.
To solve the above technical problem, in one aspect, the present invention provides a method for detecting a CCA, including: a terminal acquires CCA detection delay time from a base station; the terminal detects whether the data volume of the data to be sent reaches a preset data volume threshold value; and under the condition that the preset data volume threshold is reached, performing CCA detection on a subframe of a Physical Uplink Control CHannel (PUCCH) within the CCA detection delay time.
Optionally, the acquiring, by the terminal, the CCA detection delay time from the base station includes: when uplink data to be sent exists in the terminal in an idle state, sending a Radio Resource Control (RRC) connection establishment request to the base station, where the RRC connection establishment request carries LAA capability information of the terminal;
and the terminal in the idle state receives an RRC connection reconfiguration message from the base station under the condition of LAA capability so as to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries the CCA detection delay time.
Optionally, before the terminal detects whether the data amount of the data to be sent reaches the preset data amount threshold, the method further includes: and when the terminal in the RRC connection state has uplink data to be sent, sending a scheduling request to the base station through the PUCCH so as to obtain resources for bearing the uplink data to be sent.
Optionally, performing CCA detection on a subframe of the PUCCH within the CCA detection delay time includes: s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol; s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent; s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
Optionally, before executing S1 when the predetermined delay time period is reached, the method further includes: detecting whether the CCA detection delay time is overtime; and under the condition that the CCA detection delay time is overtime, carrying uplink data to be sent by an authorized carrier.
In another aspect, the present invention further provides a CCA detection apparatus, including: an acquisition module, configured to acquire a CCA detection delay time from a base station; the judging module is used for detecting whether the data volume of the data to be sent reaches a preset data volume threshold value; and the detection module is used for performing CCA detection on the subframe of the PUCCH within the CCA detection delay time under the condition that the preset data volume threshold is reached.
Optionally, the obtaining module is specifically configured to: when uplink data to be sent exist in a terminal in an idle state, sending a Radio Resource Control (RRC) connection establishment request to the base station, wherein the RRC connection establishment request carries LAA capability information of the terminal; and receiving an RRC connection reconfiguration message from the base station under the condition that the terminal in the idle state has the capability of authorizing carrier assisted access (LAA) to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries the CCA detection delay time.
Optionally, the apparatus further comprises: and the sending module is used for sending a scheduling request to the base station through the PUCCH when the uplink data to be sent exists in the terminal in the RRC connection state so as to acquire resources for bearing the uplink data to be sent.
Optionally, the detection module is specifically configured to: s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol; s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent; s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
Optionally, the detection module is specifically further configured to: detecting whether the CCA detection delay time is overtime; and under the condition that the CCA detection delay time is overtime, carrying uplink data to be sent by an authorized carrier.
In another aspect, the present invention further provides a storage medium storing a computer program, which when executed by a processor implements the steps of: acquiring CCA detection delay time from a base station; detecting whether the data volume of data to be sent reaches a preset data volume threshold value; and under the condition that the preset data volume threshold is reached, performing CCA detection on the subframe of the PUCCH within the CCA detection delay time.
Optionally, when the processor executes the step of obtaining the CCA detection delay time from the base station, the computer program specifically implements the following steps: when uplink data to be sent exists in the terminal in an idle state, sending an RRC connection establishment request to the base station, wherein the RRC connection establishment request carries LAA capability information of the terminal; and the terminal in the idle state receives an RRC connection reconfiguration message from the base station under the condition of LAA capability so as to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries the CCA detection delay time.
Optionally, before the step of detecting whether the data amount of the data to be sent reaches the preset data amount threshold is executed by the processor, the computer program is further executed by the processor to: and when the terminal in the RRC connection state has uplink data to be sent, sending a scheduling request to the base station through the PUCCH so as to obtain resources for bearing the uplink data to be sent.
Optionally, when the processor performs the step of performing CCA detection on the subframe of the PUCCH within the CCA detection delay time, the computer program specifically implements the following steps: s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol; s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent; s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
Optionally, before the step of S1 is executed by the processor, the computer program is further executed by the processor to: detecting whether the CCA detection delay time is overtime; and under the condition that the CCA detection delay time is overtime, carrying uplink data to be sent by an authorized carrier.
In another aspect, the present invention further provides a terminal including the storage medium.
The invention has the following beneficial effects:
the invention enables the unauthorized carrier to carry out uplink work, and the terminal side carries out CCA detection, the whole process is simple and easy to carry out, the system performance is improved, and the problem that the CCA detection can not be carried out by the terminal side before the terminal side sends uplink data because the unauthorized carrier does not support the uplink work is at least solved.
Drawings
Fig. 1 is a flow chart of a CCA detection method in a first embodiment of the present invention;
fig. 2 is a flowchart illustrating a process of uplink CCA detection performed by a mobile terminal in an RRC _ IDLE state according to a third embodiment of the present invention;
FIG. 3 is a diagram illustrating a third embodiment of the present invention for detecting that n symbols are idle;
fig. 4 is a flowchart illustrating a process of performing uplink CCA detection by a mobile terminal in RRC _ CONNECTION state according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a CCA detection apparatus according to a fourth embodiment of the present invention.
Detailed Description
In order to solve the problem that CCA detection cannot be performed by a terminal side before the terminal side transmits uplink data because uplink work is not supported on an unlicensed carrier, the present invention provides a CCA detection method, an apparatus, a storage medium, and a terminal, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
A first embodiment of the present invention provides a CCA detection method, where the flow of the method is shown in fig. 1, and the method includes steps S102 to S106:
s102, the terminal acquires CCA detection delay time from the base station. After the CCA detection delay time is obtained, the CCA detection delay time may be used when the terminal performs CCA detection, and CCA detection is performed within the CCA detection delay time.
S104, the terminal detects whether the data volume of the data to be sent reaches a preset data volume threshold value. After the CCA detection delay time is obtained, the CCA detection delay time is not necessarily used immediately, but a judgment needs to be made according to the data amount of the data to be sent, and when the data amount of the data to be sent is small, that is, the data amount does not exceed a preset data amount threshold, an LAA mode does not need to be adopted, so the CCA detection delay time does not need to be used; when the data volume of the data to be transmitted is large, that is, a preset data volume threshold is reached, the LAA mode needs to be adopted.
And S106, performing CCA detection on the subframe of the PUCCH within the CCA detection delay time under the condition that a preset data volume threshold is reached.
The terminal of the embodiment of the invention acquires the CCA detection delay time from the base station, and performs CCA detection on the subframe of the PUCCH within the CCA detection delay time when the data amount of the data to be sent reaches the preset data amount threshold, wherein the CCA detection is only performed under the condition of large data amount to be sent in the detection process, and periodic detection is not required. The method enables the unauthorized carrier to carry out uplink work, and the CCA detection is carried out by the terminal side, the whole process is simple, convenient and easy to carry out, the system performance is improved, and the problem that the unauthorized carrier does not support the uplink work and the CCA detection can not be carried out by the terminal side before the terminal side sends the uplink data is solved.
In the process of acquiring the CCA detection delay time from the base station, generally, when there is uplink data to be sent by a terminal in an idle state, an RRC connection establishment request is sent to the base station, where the RRC connection establishment request carries LAA capability information of the terminal. And the base station determines whether the terminal in the idle state supports the LAA or not according to the LAA capability information of the terminal. And under the condition that the terminal in the idle state has LAA capability, receiving an RRC connection reconfiguration message from the base station to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries CCA detection delay time.
If the terminal in idle state determines to perform CCA detection and send data after establishing connection with the base station, the base station may already allocate the terminal resource due to the connection just established, and the terminal may directly send uplink data by using the allocated resource. However, for a terminal in the RRC connection state but without data interaction for a period of time, before the terminal detects whether the data amount of the data to be sent reaches the preset data amount threshold, the terminal in the RRC connection state sends a scheduling request to the base station through the PUCCH when there is uplink data to be sent, so as to obtain a resource carrying the uplink data to be sent.
The process of performing CCA detection on the PUCCH subframe within the CCA detection delay time specifically includes:
s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol;
s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent;
s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
The above procedure is similar to the prior art RRC _ CONNECTION state detection method.
When the above process is implemented, when the predetermined delay time is reached but before S1 is not executed, it may also be detected whether the CCA detection delay time is overtime, and in the case that the CCA detection delay time is overtime, the uplink data to be sent is carried through the authorized carrier, that is, the uplink data is sent without using the LAA method.
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 (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The second embodiment of the present invention also provides a storage medium that can be provided in a terminal device, for example, in a mobile terminal, in the form of a memory. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s11, acquiring a clear channel assessment CCA detection delay time Td from the base station;
s12, detecting whether the data volume of the data to be sent reaches a preset data volume threshold value;
and S13, performing CCA detection on the subframe of the uplink physical control channel PUCCH within the CCA detection delay time under the condition that the preset data volume threshold is reached.
When the step of acquiring the CCA detection delay time from the base station is executed by the processor, the computer program at S11 specifically implements the steps of:
when uplink data to be sent exist in a terminal in an idle state, sending an RRC connection establishment request to a base station, wherein the RRC connection establishment request carries LAA capability information of the terminal; and the terminal in the idle state receives the RRC connection reconfiguration message from the base station under the condition of LAA capability so as to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries CCA detection delay time.
Before the computer program is executed by the processor to detect whether the data volume of the data to be transmitted reaches the preset data volume threshold value, the processor further executes the following steps: when uplink data to be sent exists in the terminal in the RRC connection state, a scheduling request is sent to the base station through the PUCCH so as to obtain resources for bearing the uplink data to be sent.
When the processor performs the step of performing CCA detection on the subframe of the PUCCH within the CCA detection delay time, the computer program at S13 specifically implements the following steps:
s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol;
s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent;
s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
The computer program, before being executed by the processor in the step of S1, is further executed by the processor in the steps of: detecting whether the CCA detection delay time is overtime; and under the condition that the CCA detection delay time is overtime, carrying the uplink data to be sent by an authorized carrier.
When the storage medium is executed by the processor, the CCA detection delay time from the base station is acquired, and when the data amount of the data to be sent reaches the preset data amount threshold, CCA detection is performed on the subframe of the PUCCH in the CCA detection delay time, the detection process only needs to perform CCA detection under the condition that the data amount to be sent is large, and periodic detection is not needed, so that the unlicensed carrier can perform uplink work, and CCA detection is performed by the terminal side, the whole process is simple, convenient and feasible, the system performance is improved, and the following problems in the prior art are solved: the unlicensed carrier does not support uplink operation, so CCA detection cannot be performed by the terminal side before the terminal side sends uplink data, and system performance is poor.
Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes. Optionally, in this embodiment, the processor executes the method steps described in the above embodiments according to the program code 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. 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.
Currently, there is no definition for uplink CCA detection in 3GPP, and CCA detection is performed only on a downlink channel, where the CCA is detected at a predefined detection position by a base station, and when a detection result is idle, downlink data transmission is performed on an unlicensed carrier. In future network development, the unlicensed carrier will also support uplink, and the terminal side needs to perform CCA detection before transmitting uplink data.
A third embodiment of the present invention provides a method for detecting CCA in an uplink in an LAA system. The characteristic of the uplink data to be transmitted is that the burst is strong, the CCA detection through an uplink shared physical channel (PUSCH) is performed periodically, and the periodic CCA detection causes waste of uplink resources. According to the characteristics of uplink data transmission, the embodiment places uplink CCA detection on the PUCCH channel.
For a mobile terminal in an RRC idle state, when uplink data are to be sent, the mobile terminal needs to be firstly accessed into an LTE network, then a network side judges whether the mobile terminal supports LAA according to UE capacity reported by the terminal in an access process, if the mobile terminal supports the LAA, the detection delay time Td of the LAA is configured to the terminal through an RRC connection reconfiguration message, the terminal detects whether the quantity of the uplink data needing to be sent reaches a preset threshold, if the quantity of the uplink data reaches the threshold, uplink CCA detection is carried out, and if the quantity of the uplink data does not reach the threshold, a transmission mode of an existing protocol is adopted. The method is the same as the RRC _ CONNECTION state detection method, namely, the detection is carried out in preset N symbols, if N symbols in detection results are idle, the channel state is judged to be idle, uplink data is carried out, and if the detection results do not satisfy that N symbols are idle, the detection of the N symbols is continued for the time period of Ts until Td is overtime.
When a mobile terminal in an RRC connected state actively initiates an uplink data service, a Scheduling Request SR is sent to a base station through an uplink physical control channel PUCCH, and before the terminal actively initiates a Scheduling Request (SR), uplink CCA detection is performed by obtaining an obtained delay time Td (Td is configured by a network side), which may be performed starting with an arbitrary OFDM (Orthogonal Frequency Division Multiplexing) symbol of an uplink subframe, and CCA detection is performed within preset N symbols, and if N (N < N) symbols in a detection result are idle, data transmission is performed on the idle unlicensed carrier. If no n symbols in the detection result are not idle, CCA detection is carried out again after delaying preset time Ts (Ts < < Td). Until a Td threshold is reached. And if the detection result does not reach the preset standard within the time length of Td, the uplink data transmission adopts the existing protocol to continue transmission.
The above two cases will be described below with reference to specific examples of the drawings.
Fig. 2 is a processing flow of performing uplink CCA detection by a mobile terminal in an RRC _ IDLE state, which includes an access procedure and a CCA detection procedure of the mobile terminal in the IDLE state, and specifically the following steps:
and S21, the mobile terminal is in an IDLE state.
S22, when the mobile terminal has uplink data to be transmitted, the mobile terminal accesses the LTE network by transmitting an RRC connection establishment request. In the process, the mobile terminal reports the LAA capability information to the network side so that the network side can determine whether the mobile terminal supports the LAA. If the mobile terminal does not support LAA, S27 is performed, otherwise, S23 is performed.
And if the mobile terminal does not support LAA, processing by adopting the existing protocol flow.
S23, if LAA is supported, the RRC connection reconfiguration message in the access process will carry the LAA parameter sent by the network side, that is, Td.
S24, the mobile terminal determines whether the amount of uplink data to be transmitted reaches a predetermined threshold. If the data size does not reach the set threshold, it indicates that the data size to be transmitted is small, S29 is executed, otherwise, S25 is executed.
S25, if the data amount reaches the set threshold, perform channel detection, that is, CCA detection, on N symbols within the Td time, and determine whether N consecutive symbols on the N symbols are idle. If so, S26 is performed, otherwise S27 is performed.
And S26, when the detection result is that N symbols in the N symbols are idle, determining that the current channel is idle and sending uplink data by adopting an LAA mode. The schematic of detecting n symbols as free is shown in fig. 3.
And S27, when the detection result does not reach n symbols idle, delaying for Ts time.
And S28, judging whether Td is overtime after the time Ts is delayed, if not, executing S25, otherwise, executing S29.
And S29, sending the uplink data by adopting the existing protocol flow.
Fig. 4 is a processing flow of performing uplink CCA detection by a mobile terminal in RRC _ CONNECTION state, which includes:
s41, when the terminal in the connected state has data to send, first, an SR scheduling request is sent on the PUCCH, and an existing Td is obtained.
S42, it is determined whether the amount of uplink data to be transmitted reaches a set threshold value. If the data size does not reach the set threshold, it indicates that the data size to be transmitted is small, S47 is executed, otherwise, S43 is executed.
S43, if the data amount reaches the set threshold, perform channel detection, that is, CCA detection, on N symbols within the Td time, and determine whether N consecutive symbols on the N symbols are idle. If so, S44 is performed, otherwise S45 is performed.
When performing the uplink CCA detection position, the CCA detection may start from any one OFDM symbol of one subframe and end with one complete slot.
And S44, when the detection result is that N symbols in the N symbols are idle, determining that the current channel is idle and sending uplink data by adopting an LAA mode.
And S45, when the detection result does not reach n symbols idle, delaying for Ts time.
And S46, judging whether Td is overtime after the time Ts is delayed, if not, executing S43, otherwise, executing S47.
And S47, sending the uplink data by adopting the existing protocol flow.
A fourth embodiment of the present invention provides a CCA detection apparatus, which may be disposed in a mobile terminal, and a schematic structure of the apparatus is shown in fig. 5, where the apparatus includes:
an obtaining module 10, configured to obtain a CCA detection delay time from a base station; the determining module 20 is coupled to the obtaining module 10, and configured to detect whether a data amount of data to be sent reaches a preset data amount threshold; and the detecting module 30 is coupled to the determining module 20, and configured to perform CCA detection on the subframe of the PUCCH within the CCA detection delay time when the preset data amount threshold is reached.
In an implementation process, the obtaining module may specifically be configured to: when the terminal in the idle state has uplink data to be sent, sending a Radio Resource Control (RRC) connection establishment request to a base station, wherein the RRC connection establishment request carries LAA capability information of the terminal; and under the condition that the terminal in the idle state has LAA capability, receiving an RRC connection reconfiguration message from the base station to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries CCA detection delay time.
If the terminal in idle state determines to perform CCA detection and send data after establishing connection with the base station, the base station may already allocate the terminal resource due to the connection just established, and the terminal may directly send uplink data by using the allocated resource. However, for a terminal in the RRC connected state but without data interaction for a period of time, the terminal needs to request resources before detecting whether the data amount of the data to be sent reaches the preset data amount threshold. Therefore, the above apparatus of this embodiment may further include:
and the sending module is coupled with the obtaining module and the judging module and used for sending a scheduling request to the base station through a PUCCH when the terminal in the RRC connection state has uplink data to be sent so as to obtain resources for bearing the uplink data to be sent.
The detection module may be specifically configured to: s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol; s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent; s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
When the predetermined delay time arrives but before S1 is executed, the detecting module may be further configured to: and detecting whether the CCA detection delay time is overtime, and carrying the uplink data to be sent through the authorized carrier under the condition that the CCA detection delay time is overtime.
The embodiment of the invention acquires the CCA detection delay time from the base station, and performs CCA detection on the subframe of the PUCCH within the CCA detection delay time under the condition that the data volume of the data to be sent reaches the preset data volume threshold, wherein the CCA detection is only performed under the condition that the data volume to be sent is large, and the periodical detection is not required. The method enables the unauthorized carrier to carry out uplink work, and the CCA detection is carried out by the terminal side, the whole process is simple, convenient and easy to carry out, the system performance is improved, and the problem that the CCA detection cannot be carried out by the terminal side before the terminal side sends the uplink data because the unauthorized carrier does not support the uplink work is solved.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A method for clear channel assessment, CCA, detection, comprising:
a terminal acquires CCA detection delay time from a base station;
the terminal detects whether the data volume of the data to be sent reaches a preset data volume threshold value;
performing CCA detection on a subframe of an uplink physical control channel (PUCCH) within the CCA detection delay time under the condition that the preset data volume threshold is reached;
the method for acquiring the CCA detection delay time from the base station by the terminal comprises the following steps:
when uplink data to be sent exists in the terminal in an idle state, sending a Radio Resource Control (RRC) connection establishment request to the base station, wherein the RRC connection establishment request carries LAA capability information of the terminal;
and the terminal in the idle state receives an RRC connection reconfiguration message from the base station under the condition that the terminal has the capability of authorizing carrier assisted access (LAA) so as to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries the CCA detection delay time.
2. The CCA detection method of claim 1, wherein before the terminal detects whether the data amount of the data to be transmitted reaches a preset data amount threshold, the method further comprises:
and when the terminal in the RRC connection state has uplink data to be sent, sending a scheduling request to the base station through the PUCCH so as to obtain resources for bearing the uplink data to be sent.
3. A CCA detection method according to any of claims 1 to 2, wherein CCA detecting a subframe of a PUCCH within the CCA detection delay time comprises:
s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol;
s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent;
s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
4. The CCA detection method of claim 3, wherein before performing S1 when the predetermined delay period has arrived, further comprising:
detecting whether the CCA detection delay time is overtime;
and under the condition that the CCA detection delay time is overtime, carrying uplink data to be sent by an authorized carrier.
5. An apparatus for Clear Channel Assessment (CCA) detection, comprising:
an acquisition module, configured to acquire a CCA detection delay time from a base station;
the judging module is used for detecting whether the data volume of the data to be sent reaches a preset data volume threshold value;
a detection module, configured to perform CCA detection on a subframe of an uplink physical control channel PUCCH within the CCA detection delay time when the preset data amount threshold is reached;
the acquisition module is specifically configured to:
when uplink data to be sent exist in a terminal in an idle state, sending a Radio Resource Control (RRC) connection establishment request to the base station, wherein the RRC connection establishment request carries LAA capability information of the terminal;
and receiving an RRC connection reconfiguration message from the base station under the condition that the terminal in the idle state has the capability of authorizing carrier assisted access (LAA) to establish RRC connection with the base station, wherein the RRC connection reconfiguration message carries the CCA detection delay time.
6. The CCA detection apparatus of claim 5, the apparatus further comprising:
and the sending module is used for sending a scheduling request to the base station through the PUCCH when the uplink data to be sent exists in the terminal in the RRC connection state so as to acquire resources for bearing the uplink data to be sent.
7. A CCA detection apparatus according to any of claims 5 to 6, wherein the detection module is specifically configured to:
s1, determining whether i idle symbols exist in the continuous N symbols of the current subframe from the preset symbol;
s2, under the condition that i idle symbols exist, using the i idle symbols to carry uplink data to be sent;
s3, in the absence of i idle symbols, upon arrival of a predetermined delay period, executes S1.
8. The CCA detection apparatus of claim 7, wherein the detection module is further specifically configured to:
detecting whether the CCA detection delay time is overtime;
and under the condition that the CCA detection delay time is overtime, carrying uplink data to be sent by an authorized carrier.
9. A storage medium storing a computer program, characterized in that the computer program, when being executed by a processor, carries out the steps of the clear channel assessment CCA detection method of any of claims 1 to 4.
10. A terminal, characterized in that it comprises the clear channel assessment CCA detection arrangement of any of claims 5 to 8.
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