CN111163527B - Information transmission method, device, base station and storage medium - Google Patents
Information transmission method, device, base station and storage medium Download PDFInfo
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- CN111163527B CN111163527B CN201811327420.5A CN201811327420A CN111163527B CN 111163527 B CN111163527 B CN 111163527B CN 201811327420 A CN201811327420 A CN 201811327420A CN 111163527 B CN111163527 B CN 111163527B
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- 230000005540 biological transmission Effects 0.000 title description 6
- 238000004590 computer program Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel 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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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Abstract
The disclosure relates to an information sending method, an information sending device, a base station and a storage medium, which are used for improving the probability of successful random access between the base station and user equipment. The information sending method comprises the following steps: in the process of random access between the base station and user equipment, when the base station does not receive a random access establishment message sent by the user equipment, selecting a target search space in a public search space and a private search space; and sending downlink control information to the user equipment through the target search space.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to an information sending method, an information sending apparatus, a base station, and a storage medium.
Background
The random access procedure refers to a procedure from the time when the user equipment transmits a random access preamble to the time when the user equipment attempts to access the network to establish a basic signaling connection with the network. In NB-IoT (Narrow band internet of Things), when a user equipment needs to apply for uplink resources, a random access process with a cell radio network temporary identifier is triggered.
In the random access process, when the user equipment successfully decodes the downlink control information sent by the base station, the search space of the user equipment is a private search space, and when the user equipment fails to decode the downlink control information sent by the base station, the search space of the user equipment is a public search space.
In the related art, the base station generally determines whether the user equipment successfully decodes the downlink control information according to the received power, that is, the base station generally determines the search space of the user equipment according to the received power. However, when the channel quality is not good, the determination according to the received power may be inaccurate, which may cause inconsistency between the search spaces of the user equipment and the base station, and cause a failure in random access between the user equipment and the base station.
Disclosure of Invention
The present disclosure provides an information sending method, an information sending apparatus, a base station, and a storage medium, so as to improve the probability of successful random access between a user equipment and the base station when the channel quality is not good.
In order to achieve the above object, in a first aspect, the present disclosure provides an information sending method applied to a base station, including:
in the process of random access between the base station and user equipment, when the base station does not receive a random access establishment message sent by the user equipment, selecting a target search space in a public search space and a private search space;
and sending downlink control information to the user equipment through the target search space.
Optionally, selecting a target search space from the common search space and the private search space includes:
determining a history search space used for sending downlink control information to the user equipment last time;
selecting a search space different from the historical search space as the target search space, from among the common search space and the private search space.
Optionally, selecting a target search space from the common search space and the private search space includes:
determining whether the number of times of sending downlink control information to the user equipment exceeds a preset number of times;
and when the number of times of sending the downlink control information to the user equipment does not exceed the preset number of times, selecting a target search space in the public search space and the private search space.
Optionally, the method further comprises:
and when the number of times of sending the downlink control information to the user equipment exceeds a preset number of times, disconnecting the random access process.
Optionally, when the base station does not receive the random access setup message sent by the user equipment, selecting a target search space in the public search space and the private search space includes:
and when the base station does not receive the random access establishment message sent by the user equipment within a preset time length, selecting a target search space from the public search space and the private search space.
In a second aspect, the present disclosure further provides an information sending apparatus, applied to a base station, including:
a selecting module, configured to select a target search space in a public search space and a private search space when the base station does not receive a random access establishment message sent by the user equipment during a process of performing random access between the base station and the user equipment;
and the sending module is used for sending downlink control information to the user equipment through the target search space.
Optionally, the selection module is configured to:
determining a history search space used for sending downlink control information to the user equipment last time;
selecting a search space different from the historical search space as the target search space from the common search space and the private search space.
Optionally, the selection module is configured to:
determining whether the number of times of sending downlink control information to the user equipment exceeds a preset number of times;
and when the number of times of sending the downlink control information to the user equipment does not exceed the preset number of times, selecting a target search space in the public search space and the private search space.
Optionally, the apparatus further comprises:
and the disconnection module is used for disconnecting the random access process when the number of times of sending the downlink control information to the user equipment exceeds the preset number of times.
Optionally, the selection module is configured to:
and when the base station does not receive the random access establishment message sent by the user equipment within a preset time length, selecting a target search space from the public search space and the private search space.
In a third aspect, the present disclosure also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any one of the first aspect.
In a fourth aspect, the present disclosure also provides a base station, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any of the first aspects.
By the technical scheme, when the base station does not receive the random access establishment message sent by the user equipment, a target search space is selected from the public search space and the special search space to send downlink control information to the user equipment, so that the probability that the search space of the user equipment is consistent with the search space of the base station can be improved no matter the search space of the user equipment is the public search space or the special search space, and the probability of successful random access of the user equipment and the base station is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart illustrating an information transmitting method according to an exemplary embodiment of the present disclosure;
fig. 2(a) is a schematic diagram illustrating a process of a base station interacting with a user equipment according to an exemplary embodiment of the present disclosure;
fig. 2(b) is a schematic diagram illustrating a process of a base station interacting with a user equipment according to another exemplary embodiment of the present disclosure;
fig. 3 is a flowchart illustrating an information transmitting method according to another exemplary embodiment of the present disclosure;
fig. 4 is a block diagram illustrating an information transmitting apparatus according to an exemplary embodiment of the present disclosure;
fig. 5 is a block diagram illustrating a base station according to an example embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
When user equipment in a narrowband Internet of Things (NB-IoT) NB-IoT needs to apply for uplink resources, a random access process with a cell wireless network temporary identifier is triggered. In this random access procedure, transmission of Downlink Control Information (DCI) involves two search spaces, one is a Common Search Space (CSS) for the random access procedure, and the other is a dedicated search space (USS) for the connected state (random access complete). When the user equipment successfully decodes the downlink control information sent by the base station, the search space of the user equipment is a private search space, and when the user equipment fails to decode the downlink control information sent by the base station, the search space of the user equipment is a public search space.
In the related art, the base station generally determines whether the user equipment successfully decodes the downlink control information according to the received power, that is, the base station generally determines the search space of the user equipment according to the received power. However, when the channel quality is not good, the determination according to the received power may be inaccurate, for example, the search space of the ue is a dedicated search space, and the search space of the ue is determined to be a common search space according to the received power, which may cause inconsistency between the search spaces of the ue and the base station, and may result in failure of random access between the ue and the base station.
By the information sending method provided by the embodiment of the disclosure, one search space can be selected as the search space of the base station in the private search space and the public search space, so that the consistency of the search spaces of the user equipment and the base station can be ensured no matter the search space of the user equipment is the private search space or the public search space, and the probability of the random access success of the user equipment and the base station is improved.
Fig. 1 is a flowchart illustrating an information transmitting method according to an exemplary embodiment of the present disclosure. Referring to fig. 1, the information sending method may be applied to a base station in an NB-IoT, and includes:
step S101, in the process of random access between the base station and the user equipment, when the base station does not receive the random access establishment message sent by the user equipment, selecting a target search space in a public search space and a private search space.
Step S102, sending downlink control information to the user equipment through the target search space.
In a possible implementation manner, step S101 may determine a historical search space used for last sending downlink control information to the user equipment, and then select a search space different from the historical search space as the target search space from the public search space and the private search space. That is, the base station may transmit downlink control information to the user equipment in the common search space and the dedicated search space in turn.
For example, referring to fig. 2(a), the initial search space of the user equipment and the base station is a common search space for a random access procedure, and Msg1 message, Msg2 message and Msg3 message in the random access procedure are transmitted successfully, and at the same time, the user equipment receives downlink control information (DCI0) sent by the base station and sends a random access setup message (Msg4) to the base station, that is, the search space of the user equipment becomes a private search space. However, the base station does not receive the random access setup message (Msg4) sent by the user equipment, and the base station may first determine the historical search space for sending the downlink control information (DCI0) last time, where the historical search space is assumed to be the common search space.
The base station then selects a search space different from the historical search space among the common search space and the private search space, i.e., the base station may select the private search space to resend the downlink control information (DCI0) to cause the user equipment to resend the random access setup message (Msg4) to the base station, in which case the base station may receive the random access setup message since the base station and the user equipment search spaces remain the same.
However, if the base station still does not receive the random access setup message (Msg4) sent by the user equipment as shown in fig. 2(a), the base station may select a search space different from the last search space (historical search space) among the common search space and the dedicated search space to send the downlink control information (DCI0) again, and so on until the base station receives the random access setup message (Msg4) sent by the user equipment.
For another example, referring to fig. 2(b), the initial search space between the ue and the base station is a common search space used for the random access procedure, and the Msg1 message, Msg2 message and Msg3 message in the random access procedure are all transmitted successfully, but the ue does not receive the downlink control information (DCI0) sent by the base station, that is, the search space of the ue is the common search space, at this time, the base station may first determine the historical search space in which the downlink control information (DCI0) was last sent, and it is assumed that the historical search space is the common search space.
Then, the base station may select a search space different from the historical search space among the common search space and the private search space, that is, the base station may select the private search space to retransmit the downlink control information (DCI0) to enable the user equipment to retransmit the random access setup message (Msg4) to the base station, in which case the random access setup message (Msg4) is still not received by the base station due to inconsistency between the base station and the user equipment search spaces.
Next, the base station may select a search space different from the last search space (historical search space) among the common search space and the dedicated search space to transmit the downlink control information (DCI0) again, i.e., the base station may start a process of retransmitting the downlink control information (DCI0) to the user equipment a second time in the common search space. In this case, since the search spaces of the base station and the user equipment are consistent, the base station is likely to receive the random access setup message (Msg4) sent by the user equipment.
However, if the base station still does not receive the random access setup message (Msg4) sent by the user equipment as shown in fig. 2(b), the base station may select a search space different from the last search space (historical search space) among the common search space and the dedicated search space to send the downlink control information (DCI0) again, and so on until the base station receives the random access setup message (Msg4) sent by the user equipment.
Through the mode, the base station can send the downlink control information to the user equipment in the public search space and the private search space in turn, and the consistency of the search spaces of the user equipment and the base station can be ensured no matter the search space of the user equipment is the public search space or the private search space, so that the success of random access between the user equipment and the base station is ensured.
In another possible implementation, it may be further determined whether the number of times of sending the downlink control information to the user equipment exceeds a preset number of times, and when the number of times of sending the downlink control information to the user equipment does not exceed the preset number of times, a target search space is selected from the common search space and the dedicated search space.
The preset number is the maximum retransmission number in the random access process, and may be set according to different communication requirements, and the like.
Illustratively, the preset number of times is 10, and then when the number of times that the base station retransmits the downlink control information to the user equipment does not exceed 10, a target search space may be selected from the common search space and the dedicated search space.
However, when the number of times of transmitting the downlink control information to the user equipment exceeds a preset number of times, the random access procedure may be discontinued. For example, in the example that the preset number of times is 10, when the number of times that the base station retransmits the downlink control information to the user equipment exceeds 10, the random access procedure may be discontinued.
It should be understood that the disconnection random access procedure may be releasing the user equipment, that is, deleting registration information of the user equipment on the base station, and the like, and the specific manner of disconnecting the random access procedure is not limited in the embodiments of the present disclosure.
Through the above manner, when the base station does not receive the random access establishment message sent by the user equipment all the time, the base station stops the retransmission operation with the user equipment through the limitation of the preset times, and the waste of communication resources is reduced.
In another possible implementation manner, when the base station does not receive the random access setup message sent by the user equipment within the preset time period, a target search space may be selected from the common search space and the dedicated search space.
The preset time duration may be set according to different communication requirements, and the specific setting process of the preset time duration is not limited in the embodiment of the present disclosure.
Illustratively, the preset time duration is 10 seconds, and then when the base station does not receive the random access setup message sent by the user equipment within 10 seconds, a target search space may be selected from the common search space and the dedicated search space.
Through the mode, when the random access establishment message sent by the user equipment is not received within the preset time length, the target search space is selected from the public search space and the private search space, instead of starting retransmission of the downlink control information as soon as the base station does not receive the random access establishment message sent by the user equipment, and therefore success of random access between the base station and the user equipment is ensured.
The information sending method provided by the present disclosure is explained below by a complete embodiment.
Referring to fig. 3, the information transmission method is applied to a base station of NB-IoT and may include the following steps:
step S301, when the base station does not receive the random access establishment message sent by the user equipment for responding to the downlink control information, determining the historical search space used for sending the downlink control information to the user equipment last time.
It should be understood that, if the base station does not receive the random access setup message sent by the user equipment for the first time, since there is no process of retransmitting the downlink control information to the user equipment for the last time, one of the common search space and the dedicated search space may be randomly selected as the history search space.
Step S302, selecting a search space different from the historical search space as the target search space from a public search space and a private search space.
Step S303, sending downlink control information to the user equipment through the target search space.
Step S304, determining whether the base station receives downlink control information sent by the user equipment and sent to the user equipment, if not, going to step S305, otherwise, going to step S306.
Step S305, determining whether the number of times of sending the downlink control information to the user equipment exceeds a preset number, if so, entering step S307, otherwise, entering step S301.
Step S306, the downlink control information of successful random access establishment is sent to the user equipment through the special search space.
It should be understood that, when the base station receives the random access establishment message sent by the user equipment, that is, the base station and the user equipment are in a connected state, that is, the base station may send downlink control information that the random access establishment is successful to the user equipment through a search space used in the connected state, that is, a dedicated search space.
Step S307, the random access procedure is disconnected.
By the information sending method, the base station can send the downlink control information to the user equipment in the public search space and the private search space in turn, and the search space of the user equipment is consistent with that of the base station no matter whether the search space of the user equipment is the public search space or the private search space, so that the random access success of the user equipment and the base station is ensured.
Based on the same inventive concept, referring to fig. 4, an embodiment of the present disclosure further provides an information sending apparatus 400, applied to a base station, including:
a selecting module 401, configured to select a target search space in a public search space and a private search space when the base station does not receive a random access establishment message sent by the user equipment during a process of performing random access between the base station and the user equipment;
a sending module 402, configured to send downlink control information to the user equipment through the target search space.
Optionally, the selecting module 401 is configured to:
determining a history search space used for sending downlink control information to the user equipment last time;
selecting a search space different from the historical search space as the target search space from the common search space and the private search space.
Optionally, the selecting module 401 is configured to:
determining whether the number of times of sending downlink control information to the user equipment exceeds a preset number of times;
and when the number of times of sending the downlink control information to the user equipment does not exceed the preset number of times, selecting a target search space in the public search space and the private search space.
Optionally, the apparatus 400 further comprises:
and the disconnection module is used for disconnecting the random access process when the number of times of sending the downlink control information to the user equipment exceeds the preset number of times.
Optionally, the selecting module 401 is configured to:
and when the base station does not receive the random access establishment message sent by the user equipment within a preset time length, selecting a target search space from the public search space and the private search space.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
By any of the above information sending devices, the base station can send downlink control information to the user equipment in the public search space and the private search space in turn, and the search space of the user equipment is consistent with that of the base station no matter whether the search space of the user equipment is the public search space or the private search space, so that the success of random access between the user equipment and the base station is ensured.
Based on the same inventive concept, the present disclosure also provides a base station, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of any of the above-described methods of information transmission.
Therefore, the base station can send the downlink control information to the user equipment in the public search space and the private search space in turn, and the search space of the user equipment is consistent with that of the base station no matter whether the search space of the user equipment is the public search space or the private search space, so that the random access success of the user equipment and the base station is ensured.
In an exemplary embodiment, a block diagram of the base station may be as shown in fig. 5. Referring to fig. 5, the base station 500 comprises a processor 522, which may be one or more in number, and a memory 532 for storing random access setup messages sent by the user equipment, or storing a computer program executable by the processor 522, or the like. The computer programs stored in memory 532 may include one or more modules that each correspond to a set of instructions. Further, the processor 522 may be configured to execute the computer program to execute the information transmitting method, that is, the processor 522 may execute the computer program to select a target search space from the common search space and the dedicated search space when the base station does not receive the random access setup message transmitted by the user equipment during the random access between the base station and the user equipment, and transmit downlink control information to the user equipment through the target search space.
In addition, the base station 500 may further comprise a power component 526 and a communication component 550, the power component 526 may be configured to perform power management of the base station 500, the communication component 550 may be configured to enable communication of the base station 500, e.g., enable communication of the base station 500 with user equipment (random access procedure), and so on. Also, the communication component 500 can implement various communication means such as wired or wireless communication. The base station 500 may also include an input/output (I/O) interface 558. The base station 500 may operate based on an operating system stored in memory 532, such as Windows Server, MacOS XTM, UnixTM, LinuxTM, and the like.
In another exemplary embodiment, there is also provided a computer readable storage medium including program instructions, which when executed by a processor, implement the steps of the information transmitting method described above. For example, the computer readable storage medium may be the memory 532 described above including program instructions that are executable by the processor 522 of the base station 500 to perform the above-described information transmission method.
When the computer readable storage medium is applied to a base station, the base station can send downlink control information to user equipment in a public search space and a private search space in turn, and the search space of the user equipment can be ensured to be consistent with that of the base station no matter whether the search space of the user equipment is the public search space or the private search space, so that the random access success of the user equipment and the base station is ensured.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. An information sending method, applied to a base station, includes:
in the process of random access between the base station and user equipment, when the base station does not receive a random access establishment message sent by the user equipment, selecting a target search space in a public search space and a private search space;
sending downlink control information to the user equipment through the target search space;
selecting a target search space from the public search space and the private search space includes:
determining a history search space used for sending downlink control information to the user equipment last time;
selecting a search space different from the historical search space as the target search space, from among the common search space and the private search space.
2. The method of claim 1, wherein selecting a target search space from the common search space and the private search space comprises:
determining whether the number of times of sending downlink control information to the user equipment exceeds a preset number of times;
and when the number of times of sending the downlink control information to the user equipment does not exceed the preset number of times, selecting a target search space in the public search space and the private search space.
3. The method of claim 2, further comprising:
and when the number of times of sending the downlink control information to the user equipment exceeds the preset number of times, disconnecting the random access process.
4. The method as claimed in any one of claims 1 to 3, wherein selecting a target search space from the common search space and the dedicated search space when the base station does not receive the random access setup message sent by the user equipment comprises:
and when the base station does not receive the random access establishment message sent by the user equipment within a preset time length, selecting a target search space from the public search space and the private search space.
5. An information transmitting apparatus, applied to a base station, comprising:
a selecting module, configured to select a target search space in a public search space and a private search space when the base station does not receive a random access establishment message sent by the user equipment during a process of performing random access between the base station and the user equipment;
a sending module, configured to send downlink control information to the user equipment through the target search space;
the selection module is configured to:
determining a history search space used for sending downlink control information to the user equipment last time;
selecting a search space different from the historical search space as the target search space from the common search space and the private search space.
6. The apparatus of claim 5, wherein the selection module is configured to:
determining whether the number of times of sending downlink control information to the user equipment exceeds a preset number of times;
and when the number of times of sending the downlink control information to the user equipment does not exceed the preset number of times, selecting a target search space in the public search space and the private search space.
7. The apparatus of claim 6, further comprising:
and the disconnection module is used for disconnecting the random access process when the number of times of sending the downlink control information to the user equipment exceeds the preset number of times.
8. The apparatus according to any of claims 5-7, wherein the selection module is configured to:
and when the base station does not receive the random access establishment message sent by the user equipment within a preset time length, selecting a target search space from the public search space and the private search space.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
10. A base station, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 4.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102883459A (en) * | 2011-07-12 | 2013-01-16 | 华为技术有限公司 | Receiving-transmitting method of random access response, user equipment, base station and system |
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