CN111356245B - Initial access method and system for asymmetric uplink carrier aggregation - Google Patents
Initial access method and system for asymmetric uplink carrier aggregation Download PDFInfo
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- CN111356245B CN111356245B CN201811579668.0A CN201811579668A CN111356245B CN 111356245 B CN111356245 B CN 111356245B CN 201811579668 A CN201811579668 A CN 201811579668A CN 111356245 B CN111356245 B CN 111356245B
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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
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The application discloses an initial access method and a system for asymmetric uplink carrier aggregation, wherein the method comprises the following steps: a base station broadcasts common configuration information of a supplementary uplink SUL carrier bound with an FDD downlink carrier in an FDD downlink carrier; and the terminal equipment selects the carrier for initial random access according to the common configuration information and the uplink carrier type supported by the terminal equipment, and performs corresponding initial random access. By adopting the invention, the terminal equipment only supporting the SUL carrier can carry out initial random access under the asymmetric uplink carrier aggregation scene.
Description
Technical Field
The present invention relates to mobile communication technology, and in particular, to an initial access method and system for asymmetric uplink carrier aggregation.
Background
In the current LTE system, a single carrier supports a system bandwidth of 20M at maximum, and if a larger bandwidth is to be supported, a carrier aggregation technique needs to be adopted.
In the 3GPP protocol, aggregation of a maximum of 5 carriers is supported, but the number of downlink carriers is required to be equal to or greater than the number of uplink carriers. In a public network operator network, the general downlink service requirement is greater than the uplink service requirement, and the carrier aggregation defined by 3GPP can better satisfy the operator network.
However, in some industry network applications, there may be a large amount of video monitoring services, and at this time, the uplink service requirement is greater than the downlink service requirement, and in this case, the carrier aggregation scheme defined by 3GPP cannot well meet the requirements of the industry network.
In order to better satisfy a large number of uplink service demand scenarios, an asymmetric carrier aggregation technology in which the number of uplink carriers is greater than the number of downlink carriers needs to be introduced.
Fig. 1 is a schematic diagram of asymmetric uplink carrier aggregation. As shown in figure 1 of the drawings, in which,
when the number of uplink carriers is greater than the number of downlink carriers, the uplink carriers may be divided into two types: one type is that the carrier can be paired with a downlink carrier to be used as a Frequency Division Duplex (FDD) main carrier; one type exists as a Supplemental Uplink (or full Uplink) carrier (SUL), and there is no corresponding downlink paired carrier.
According to the existing system protocol, a terminal needs to access an FDD primary carrier first, notify the terminal of relevant parameters of an SUL carrier through Radio Resource Control (RRC) dedicated signaling, and then the terminal can initiate random access in the SUL carrier. Therefore, the existing system protocol only supports the terminal to initiate initial random access on the FDD primary carrier.
The inventor discovers that in the process of implementing the invention: the existing scheme that only supports the terminal to initiate the initial random access in the FDD primary carrier cannot meet the requirements of practical application. For example, when the terminal only supports uplink transmission on the SUL carrier and does not support uplink transmission on the FDD uplink primary carrier, the initial random access cannot be performed in the asymmetric uplink carrier aggregation scenario.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide an initial access method and system for asymmetric uplink carrier aggregation, so that a terminal device only supporting a SUL carrier can perform initial random access in an asymmetric uplink carrier aggregation scenario.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an initial access method for asymmetric uplink carrier aggregation comprises the following steps:
a base station broadcasts common configuration information of a supplementary uplink SUL carrier bound with an FDD downlink carrier in an FDD downlink carrier;
and the terminal equipment selects the carrier for initial random access according to the common configuration information and the uplink carrier type supported by the terminal equipment, and performs corresponding initial random access.
Preferably, the common configuration information includes:
the system comprises an uplink carrier frequency point, an uplink carrier bandwidth, RACH public configuration information, PRACH public configuration information, PUSCH public configuration information, PUCCH public configuration information, Sounding RS public configuration information, uplink power control public configuration information and an uplink CP length.
Preferably, the selecting a carrier for initial access includes:
if the terminal equipment does not support the SUL carrier, selecting an FDD carrier in the uplink carriers bound with the FDD downlink carrier for initial random access;
If the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access;
and if the terminal equipment supports both the SUL carrier and the uplink FDD main carrier, selecting the uplink FDD main carrier or the SUL carrier for initial random access.
Preferably, the method further comprises:
and if the base station detects that the interference index of the FDD carrier in the uplink carrier bound with the FDD downlink carrier is greater than a preset interference threshold value, or the FDD carrier is a high-frequency-band carrier, carrying a CRS RSRP threshold in the public configuration information.
Preferably, when the terminal device detects that the CRS RSRP threshold is carried in the common configuration information, the selecting a carrier for initial random access includes:
if the terminal equipment does not support the SUL carrier, selecting an FDD carrier in the uplink carriers bound with the FDD downlink carrier for initial random access;
if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access;
And if the terminal equipment supports both FDD carriers and SUL carriers, selecting the FDD carriers for initial random access when the currently measured CRS RSRP is larger than the CRS RSRP threshold, otherwise, selecting SUL carriers in the uplink carriers bound with the FDD downlink carriers according to the common configuration information for initial random access.
An initial access system for asymmetric uplink carrier aggregation, comprising:
the base station is used for broadcasting the common configuration information of the supplementary uplink SUL carrier bound with the FDD downlink carrier in the FDD downlink carrier;
and the terminal equipment is used for selecting the carrier for initial random access according to the public configuration information and the uplink carrier type supported by the terminal equipment, and performing corresponding initial random access.
Preferably, the common configuration information includes:
the uplink control channel comprises an uplink carrier frequency point, an uplink carrier bandwidth, Random Access Channel (RACH) common configuration information, Physical Random Access Channel (PRACH) common configuration information, Physical Uplink Shared Channel (PUSCH) common configuration information, Physical Uplink Control Channel (PUCCH) common configuration information, Sounding reference signal (Sounding RS) common configuration information, uplink power control common configuration information and uplink Cyclic Prefix (CP) length.
Preferably, the terminal device is configured to select, if the terminal device does not support the SUL carrier, an FDD carrier in the uplink carriers bound to the FDD downlink carrier for initial random access; if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access; and if the terminal equipment supports both the SUL carrier and the uplink FDD main carrier, selecting the uplink FDD main carrier or the SUL carrier for initial random access.
Preferably, the base station is further configured to carry a received power reference signal (CRS RSRP) threshold of a common reference signal in the common configuration information if it is detected that an interference indicator of an FDD carrier in an uplink carrier bound to the FDD downlink carrier is greater than a preset interference threshold or the FDD carrier is a high-frequency band carrier.
Preferably, the terminal device is further configured to, when the detected CRS RSRP threshold is carried in the common configuration information, select a carrier packet for initial random access, and if the terminal device does not support a SUL carrier, select an FDD carrier among uplink carriers bound to the FDD downlink carrier for initial random access; if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access; and if the terminal equipment supports both FDD carriers and SUL carriers, selecting the FDD carriers for initial random access when the currently measured CRS RSRP is larger than the CRS RSRP threshold, and otherwise, selecting SUL carriers in uplink carriers bound with the FDD downlink carriers according to the common configuration information for initial random access.
In summary, the initial access method and system for asymmetric uplink carrier aggregation according to the present invention broadcast, on an FDD downlink carrier, common configuration information of a supplemental uplink SUL carrier bound to the FDD downlink carrier; in this way, when the terminal device initially accesses, the carrier for initial random access may be determined according to the common configuration information of the SUL carrier broadcast by the network side and the uplink carrier type supported by the terminal device, so that the terminal device that only supports the SUL carrier may also obtain the relevant configuration information of the SUL carrier, and further may perform initial random access in the asymmetric uplink carrier aggregation scene by using the configuration information.
Drawings
Fig. 1 is a schematic diagram of asymmetric uplink carrier aggregation;
fig. 2 is an exploded view of asymmetric uplink carrier aggregation;
FIG. 3 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
For asymmetric carrier aggregation, the method can be decomposed into the form shown in fig. 2, and each carrier aggregation cluster includes one downlink carrier and one or more uplink carriers. The downlink carrier and the corresponding uplink carrier are defined as an FDD carrier, and the other uplink carriers are defined as SUL carriers.
The aggregation between multiple carrier aggregation clusters is actually the aggregation between FDD carriers, which is equivalent to the carrier aggregation defined in 3 GPP. In addition, aggregation of TDD carriers may also be introduced, and aggregation of TDD carriers and FDD carriers is similar to carrier aggregation defined in 3 GPP.
For a scenario of one downlink carrier and K uplink carriers, the downlink carrier and one uplink carrier corresponding to the downlink carrier are FDD carriers, and the remaining K-1 uplink carriers are defined as SUL carriers.
Fig. 3 is a schematic method flow diagram of an embodiment of the present invention, and as shown in fig. 3, an initial access method for asymmetric uplink carrier aggregation implemented in the embodiment mainly includes:
The uplink carrier bound with the FDD downlink carrier comprises an FDD carrier and at least one SUL carrier.
The difference between this step and the existing system is that the common configuration information of the SUL carrier bound with the FDD downlink carrier needs to be broadcasted at the FDD downlink carrier, so that the terminal device only supporting SUL carrier transmission can acquire the common configuration information of the SUL carrier without accessing the system on the FDD carrier first, and thus can access the network on the SUL carrier directly.
In addition, here, the base station only broadcasts the common configuration information of the SUL carriers bound with the FDD downlink carriers, but not the common configuration information of all the SUL carriers of the system, so that the downlink resource overhead can be effectively saved.
Preferably, the common configuration information may include, but is not limited to:
the method comprises the steps of uplink carrier frequency points, uplink carrier bandwidth, RACH public configuration information, PRACH public configuration information, PUSCH public configuration information, PUCCH public configuration information, Sounding RS public configuration information, uplink power control public configuration information and uplink CP length.
Preferably, the carrier used for initial access can be selected by the following method:
and if the terminal equipment does not support the SUL carrier, selecting an FDD carrier in the uplink carriers bound with the FDD downlink carrier for initial random access.
And if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access.
And if the terminal equipment supports both the SUL carrier and the uplink FDD main carrier, selecting the uplink FDD main carrier or the SUL carrier for initial random access. In specific implementation, a random selection mode may be adopted, or a selection according to carrier configuration may be adopted, or other preset selection modes are not described herein again.
Further, the inventor finds out in the process of implementing the invention that: in practical applications, in some cases, the terminal initiates the initial random access on the SUL carrier, which may effectively increase the success rate of the terminal access. The specific situation is as follows:
1. the FDD uplink carrier suffers strong interference and the uplink coverage will shrink severely. At this time, the SUL carrier is used for initial access, so that uplink coverage can be greatly improved.
2. The FDD carrier is the high band and the SUL carrier is the low band, at this point, initiating initial random access at the SUL carrier will greatly improve uplink coverage.
Based on this, in order to improve the success rate of terminal device access and improve coverage, further, the method may further include the following technical features:
and if the base station detects that the interference index of the FDD carrier in the uplink carrier bound with the FDD downlink carrier is greater than a preset interference threshold value, or the FDD carrier is a high-frequency-band carrier, carrying a common reference signal received power (CRS RSRP) threshold in the common configuration information.
Correspondingly, when the terminal device detects that the CRS RSRP threshold is carried in the common configuration information, the following method may be adopted to select a carrier for initial random access:
if the terminal equipment does not support the SUL carrier, selecting an FDD carrier in the uplink carriers bound with the FDD downlink carrier for initial random access;
if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access;
and if the terminal equipment supports both FDD carriers and SUL carriers, selecting the FDD carriers for initial random access when the currently measured CRS RSRP is larger than the CRS RSRP threshold, otherwise, selecting SUL carriers in the uplink carriers bound with the FDD downlink carriers according to the common configuration information for initial random access.
In the above method, when the FDD carrier is interfered or the FDD carrier is in a high frequency band, the coverage of the FDD carrier may be weaker than that of the SUL carrier, and at this time, in order to improve the coverage, the terminal is required to support the direct initiation of the initial random access on the SUL carrier. Meanwhile, in order to balance capacity, users in weak coverage (CRS RSRP is not greater than the CRS RSRP threshold) are required to initiate initial access on the SUL carrier, while users in strong coverage (i.e. CRS RSRP is greater than the CRS RSRP threshold) initiate initial access on the FDD carrier.
In practical application, a person skilled in the art may set the CRS RSRP threshold according to actual needs to reasonably distinguish between strong coverage and weak coverage.
As can be seen from the foregoing method embodiments, the terminal according to the embodiments of the present invention can implement initial access only to support the SUL carrier, and the terminal does not need to perform initial access from the FDD carrier first and then switch to the SUL carrier through carrier switching. Further, for the scenario that the coverage of the FDD and the SUL is not balanced, CRS RSRP threshold information is added in the broadcast of the FDD downlink carrier, so that the terminal device can select to initiate initial access on a proper carrier according to the received CRS RSRP strength, and thus the coverage can be improved.
Fig. 4 is a schematic structural diagram of an initial access system for asymmetric uplink carrier aggregation corresponding to the foregoing method embodiment, and as shown in fig. 4, the system includes:
and the base station is used for broadcasting the common configuration information of the supplementary uplink SUL carrier bound with the FDD downlink carrier in the FDD downlink carrier.
And the terminal equipment is used for selecting the carrier for initial random access according to the public configuration information and the uplink carrier type supported by the terminal equipment, and performing corresponding initial random access.
Preferably, the common configuration information includes:
the system comprises an uplink carrier frequency point, an uplink carrier bandwidth, RACH public configuration information, PRACH public configuration information, PUSCH public configuration information, PUCCH public configuration information, Sounding RS public configuration information, uplink power control public configuration information and an uplink CP length.
Preferably, the terminal device is configured to select, if the terminal device does not support the SUL carrier, an FDD carrier in the uplink carriers bound to the FDD downlink carrier for initial random access; if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access; and if the terminal equipment supports both the SUL carrier and the uplink FDD main carrier, selecting the uplink FDD main carrier or the SUL carrier for initial random access. .
Preferably, the base station is further configured to carry a CRS RSRP threshold in the common configuration information if it is detected that an interference indicator of an FDD carrier in the uplink carrier bound to the FDD downlink carrier is greater than a preset interference threshold or the FDD carrier is a high-frequency band carrier.
Preferably, the terminal device is further configured to, when the detected CRS RSRP threshold is carried in the common configuration information, select a carrier packet for initial random access, and if the terminal device does not support a SUL carrier, select an FDD carrier among uplink carriers bound to the FDD downlink carrier for initial random access; if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access; and if the terminal equipment supports both FDD carriers and SUL carriers, selecting the FDD carriers for initial random access when the currently measured CRS RSRP is larger than the CRS RSRP threshold, and otherwise, selecting SUL carriers in uplink carriers bound with the FDD downlink carriers according to the common configuration information for initial random access.
In summary, in the initial access scheme for asymmetric uplink carrier aggregation provided in the embodiment of the present invention, the common configuration information of the supplemental uplink SUL carrier bound to the FDD downlink carrier is broadcast on the FDD downlink carrier; in this way, when the terminal device initially accesses, the carrier for initial random access can be determined according to the common configuration information of the SUL carrier broadcast by the network side and the uplink carrier type supported by the terminal device, so that the terminal device only supporting the SUL carrier can also obtain the relevant configuration information of the SUL carrier, and the initial random access can be performed in the asymmetric uplink carrier aggregation scene by using the configuration information.
In addition, each of the embodiments of the present invention can be realized by a data processing program executed by a data processing apparatus such as a computer. It is clear that the data processing program constitutes the invention. Further, the data processing program, which is generally stored in one storage medium, is executed by directly reading the program out of the storage medium or by installing or copying the program into a storage device (such as a hard disk and/or a memory) of the data processing device. Such a storage medium therefore also constitutes the present invention. The storage medium may use any type of recording means, such as a paper storage medium (e.g., paper tape, etc.), a magnetic storage medium (e.g., a flexible disk, a hard disk, a flash memory, etc.), an optical storage medium (e.g., a CD-ROM, etc.), a magneto-optical storage medium (e.g., an MO, etc.), and the like.
The invention therefore also discloses a storage medium in which a data processing program is stored which is designed to carry out any one of the embodiments of the method according to the invention described above.
In addition, the method steps described in the present invention can be implemented by hardware, for example, logic gates, switches, Application Specific Integrated Circuits (ASICs), programmable logic controllers, embedded microcontrollers and the like, in addition to data processing programs. Such hardware capable of implementing the methods of the present invention may also constitute the present invention.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. 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 (6)
1. An initial access method for asymmetric uplink carrier aggregation, comprising:
a base station broadcasts common configuration information of a supplementary uplink SUL carrier bound with an FDD downlink carrier in an FDD downlink carrier; if the base station detects that the interference index of an FDD carrier in an uplink carrier bound with the FDD downlink carrier is greater than a preset interference threshold value, or the FDD carrier is a high-frequency-band carrier, carrying a CRS RSRP threshold in the public configuration information;
the terminal equipment selects a carrier for initial random access according to the public configuration information and the uplink carrier type supported by the terminal equipment, and performs corresponding initial random access;
when the terminal device detects that the CRS RSRP threshold is carried in the common configuration information, the selecting a carrier for initial random access includes:
if the terminal equipment does not support the SUL carrier, selecting an FDD carrier in the uplink carriers bound with the FDD downlink carrier for initial random access;
If the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access;
and if the terminal equipment supports both FDD carriers and SUL carriers, selecting the FDD carriers for initial random access if the currently measured CRS RSRP is greater than the CRS RSRP threshold, and otherwise, selecting SUL carriers in the uplink carriers bound with the FDD downlink carriers according to the common configuration information for initial random access.
2. The method of claim 1, wherein the common configuration information comprises:
the system comprises an uplink carrier frequency point, an uplink carrier bandwidth, RACH public configuration information, PRACH public configuration information, PUSCH public configuration information, PUCCH public configuration information, Sounding RS public configuration information, uplink power control public configuration information and an uplink CP length.
3. The method of claim 1, wherein the selecting the carrier for initial access comprises:
if the terminal equipment does not support the SUL carrier, selecting an FDD carrier in the uplink carriers bound with the FDD downlink carrier for initial random access;
If the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access;
and if the terminal equipment supports both the SUL carrier and the uplink FDD main carrier, selecting the uplink FDD main carrier or the SUL carrier for initial random access.
4. An initial access system for asymmetric uplink carrier aggregation, comprising:
the base station is used for broadcasting the common configuration information of the supplementary uplink SUL carrier bound with the FDD downlink carrier in the FDD downlink carrier; if the interference index of an FDD carrier in an uplink carrier bound with the FDD downlink carrier is detected to be larger than a preset interference threshold value, or the FDD carrier is a high-frequency-band carrier, carrying a CRS RSRP threshold in the public configuration information;
the terminal equipment is used for selecting a carrier for initial random access according to the public configuration information and the uplink carrier type supported by the terminal equipment, and performing corresponding initial random access; when the detected CRS RSRP threshold is carried in the public configuration information, when a carrier for initial random access is selected, if the terminal equipment does not support SUL carrier, an FDD carrier in an uplink carrier bound with the FDD downlink carrier is selected for initial random access; if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access; if the terminal equipment supports both FDD carriers and SUL carriers, selecting the FDD carriers for initial random access if the currently measured CRS RSRP is greater than the CRS RSRP threshold, otherwise, selecting SUL carriers in uplink carriers bound with the FDD downlink carriers for initial random access according to the common configuration information.
5. The system of claim 4, wherein the common configuration information comprises:
the system comprises an uplink carrier frequency point, an uplink carrier bandwidth, RACH public configuration information, PRACH public configuration information, PUSCH public configuration information, PUCCH public configuration information, Sounding RS public configuration information, uplink power control public configuration information and an uplink CP length.
6. The system according to claim 4, wherein the terminal device is configured to select, if the terminal device does not support a SUL carrier, an FDD carrier among the uplink carriers bound to the FDD downlink carrier for initial random access; if the terminal equipment only supports the SUL carrier, selecting the SUL carrier in the uplink carriers bound with the FDD downlink carrier according to the common configuration information for initial random access; and if the terminal equipment supports both the SUL carrier and the uplink FDD main carrier, selecting the uplink FDD main carrier or the SUL carrier for initial random access.
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| CN201811579668.0A CN111356245B (en) | 2018-12-24 | 2018-12-24 | Initial access method and system for asymmetric uplink carrier aggregation |
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| CN201811579668.0A CN111356245B (en) | 2018-12-24 | 2018-12-24 | Initial access method and system for asymmetric uplink carrier aggregation |
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| CN105376035A (en) * | 2014-08-28 | 2016-03-02 | 成都鼎桥通信技术有限公司 | Method and device for controlling non-main carrier during asymmetric uplink carrier aggregation process |
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| CN105376035A (en) * | 2014-08-28 | 2016-03-02 | 成都鼎桥通信技术有限公司 | Method and device for controlling non-main carrier during asymmetric uplink carrier aggregation process |
| WO2018200117A1 (en) * | 2017-04-27 | 2018-11-01 | Qualcomm Incorporated | Sharing of long-term evolution (lte) uplink spectrum |
| CN108370574A (en) * | 2017-10-30 | 2018-08-03 | 北京小米移动软件有限公司 | Accidental access method and device |
| CN108521883A (en) * | 2018-04-19 | 2018-09-11 | 北京小米移动软件有限公司 | Control the method and device of network insertion |
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