CN111182473A - Method for sending multicast data in Internet of things - Google Patents
Method for sending multicast data in Internet of things Download PDFInfo
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- CN111182473A CN111182473A CN201911395174.1A CN201911395174A CN111182473A CN 111182473 A CN111182473 A CN 111182473A CN 201911395174 A CN201911395174 A CN 201911395174A CN 111182473 A CN111182473 A CN 111182473A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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Abstract
The invention is suitable for the field of wireless communication technology improvement, and provides a method for sending multicast data in the Internet of things, which comprises the following steps: s1, the base station divides the multicast information into first multicast information and second multicast information and repeatedly sends the first multicast information for X times; s2, the first terminal receives the first multicast information sent by the base station and decodes the first multicast information to obtain first feedback information of the first terminal; s3, the second terminal successfully receives the first feedback information, and the second terminal and the base station use the same resource to jointly send second multicast information; s4, judging whether the first terminal tries to receive the second multicast information successfully; s5, after the base station successfully receives the second feedback information, increasing the time frequency resource used for subsequently sending the second multicast information; s6, after the second terminal receives the first multicast information sent by the base station for Z times, the first multicast information is successfully decoded; the method improves the frequency spectrum efficiency of the Internet of things system and reduces the control overhead.
Description
Technical Field
The invention belongs to the field of wireless communication technology improvement, and particularly relates to a method for sending multicast data in the Internet of things.
Background
The 5G can meet diversified business requirements of people in various areas such as residence, work, leisure and traffic, and can provide extremely-sophisticated business experience such as ultra-high-definition video, virtual reality, augmented reality, cloud desktops and online games for users even in scenes with ultra-high traffic density, ultra-high connection number density and ultra-high mobility characteristics such as dense residential areas, offices, stadiums, outdoor gatherings, subways, expressways, high-speed rails and wide area coverage. Meanwhile, 5G can permeate into the fields of the Internet of things and various industries, is deeply integrated with industrial facilities, medical instruments, vehicles and the like, effectively meets the diversified business requirements of the vertical industries such as industry, medical treatment, transportation and the like, and realizes real 'everything interconnection'.
The 5G application scenarios can be divided into two broad categories, namely Mobile Broadband (MBB) and Internet of Things (IoT). Among these, the main technical requirements for mobile broadband access are high capacity, providing high data rates to meet the ever-increasing demand for data services. The internet of things is mainly driven by the requirement of Machine Communication (MTC), and can be further divided into two types, including low-speed Mass Machine Communication (MMC) and low-latency high-reliability Machine Communication. For the low-speed mass machine communication, mass nodes are accessed at a low speed, the transmitted data packets are usually small, the interval time is relatively long, and the cost and the power consumption of the nodes are usually low; for machine communication with low time delay and high reliability, the method is mainly used for machine communication with higher requirements on instantaneity and reliability, such as real-time alarm, real-time monitoring and the like.
In a fifth-generation mobile communication system, a scene needing to be researched is an effective and reliable transmission problem of multicast data in the internet of things, and a common solution mainly depends on repeated transmission of data for multiple times, so that the spectral efficiency of the system is low, how to increase the transmission spectral efficiency of the multicast data in the internet of things system is an important problem to be solved urgently in the internet of things system.
Disclosure of Invention
The invention aims to provide a method for sending multicast data in the Internet of things, and aims to solve the problem of low transmission spectrum efficiency of the multicast data in the Internet of things.
The invention is realized in such a way that the method for sending the multicast data in the Internet of things comprises the following steps:
s1, the base station divides the multicast information into first multicast information and second multicast information and repeatedly sends the first multicast information for X times;
s2, the first terminal not carrying out uplink synchronization receives the first group for Y times sent by the base station
After broadcasting information, the first broadcasting information is successfully decoded, and the first terminal is used for decoding the first broadcasting information according to the Y and the Y
The first feedback resource pool configuration information determines that the first terminal sends the first feedback resource pool configuration information to the base station
A first feedback resource used by feedback information, through which the first terminal passes
Repeatedly sending the first feedback information for Y times
S3, the second terminal conforming to the configuration information of the auxiliary terminal successfully receives the first feedback information on the first feedback resource, and the second terminal and the base station use the same resource to jointly send the second multicast information;
s4, determining whether the first terminal attempts to receive the second multicast information successfully, if the reception is successful, the first terminal sends an uplink random access channel based on the second multicast information and executes the next step, and if the reception is unsuccessful, the first terminal sends the second feedback information of which the reception is unsuccessful on the second feedback resource;
s5, after the base station successfully receives the second feedback information, increasing time-frequency resources used for subsequently sending the second multicast information, and sending the second multicast information together with the base station by using the same resources only when the electric quantity of the second terminal is required to be informed to be more than N%, and the base station repeatedly sends the first multicast information updated for X times;
s6, after the second terminal receives the first multicast information sent by the base station for Z times, the second terminal successfully decodes the first multicast information, and when the electric quantity of the second terminal is more than N%, the second terminal repeatedly transmits the remaining (X-Z) times of first multicast information by using the time-frequency resource same as that of the base station;
wherein X is an integer of 32 or more, Y is a positive integer of 0.75X to 100 or more, N is an integer of 0 to X or more, and Z is an integer of 0 to X or more.
The further technical scheme of the invention is as follows: the first multicast information at least includes configuration information of the second multicast information, configuration information of a first feedback resource pool, and configuration information of an auxiliary terminal, the second multicast information at least includes configuration information of a random access channel and configuration information of a second feedback resource, the configuration information of the auxiliary terminal at least includes indication information for notifying a terminal in a connection state that the electric quantity is greater than or equal to M% to assist in sending the second multicast information, and M is an integer greater than or equal to 80 and less than or equal to 100.
The further technical scheme of the invention is as follows: the first feedback resource pool comprises (0.25X) candidate first feedback resources, and the number of times of repeated sending of the first feedback information supported by the candidate first feedback resources is (0.75X), (0.75X + 1), (0.75X + 2), … …, (X-2), (X-1), and X, respectively.
The further technical scheme of the invention is as follows: the second feedback resource configuration information only includes one second feedback resource, and the number of times of repeated sending of the second feedback information supported by the second feedback resource is X.
The further technical scheme of the invention is as follows: and if the signal strength of the first feedback information successfully received by the second terminal is S and the maximum transmission power of the second terminal is P, the power of the second multicast information sent by the second terminal is (P-S).
The further technical scheme of the invention is as follows: the strength of the downlink synchronous signal sent by the base station and received by the second terminal is less than or equal to 5 dB; and when the signal strength of the first feedback information received by the second terminal is S, the S is more than or equal to 10 dB.
The further technical scheme of the invention is as follows: if the second terminal needs to receive other data information sent to it by the base station within a partial time range in which the base station sends the second multicast information, the second terminal does not need to send the second multicast information within the partial time range.
The further technical scheme of the invention is as follows: and if the signal strength of the first feedback information successfully received by the base station is less than 0dB, the base station can only provide service for a third terminal within the sending time range of the second multicast information, wherein the third terminal is a terminal with channel quality information fed back by the base station greater than 10 dB.
The further technical scheme of the invention is as follows: and if the signal strength of the first feedback information successfully received by the base station is less than-5 dB, the base station can only send the second multicast information within the sending time range of the second multicast information.
The further technical scheme of the invention is as follows: the configuration information of the second multicast information at least comprises a time-frequency resource position used for sending the second multicast information.
The invention has the beneficial effects that: the method solves the problem of poor spectrum efficiency of multicast data in the existing Internet of things, improves the spectrum efficiency of the Internet of things system, and reduces the control overhead.
Drawings
Fig. 1 is a flowchart of a method for sending multicast data in the internet of things according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, a flowchart of a method for sending multicast data in the internet of things provided by the present invention is detailed as follows:
step S1, the base station divides the multicast information into first multicast information and second multicast information, where the first multicast information at least includes configuration information of the second multicast information, configuration information of a first feedback resource pool, and configuration information of an auxiliary terminal, the second multicast information at least includes configuration information of a random access channel and configuration information of a second feedback resource, the configuration information of the auxiliary terminal at least includes indication information for notifying a terminal in a connected state that an electric quantity is greater than or equal to M% to assist in sending the second multicast information, and M is an integer greater than or equal to 80 and less than or equal to 100; and the base station repeatedly transmits the first multicast information for X times, wherein X is an integer greater than or equal to 32.
Step S2, after receiving the first multicast information sent by the base station Y times, the first terminal that does not perform uplink synchronization successfully decodes the first multicast information, and determines, according to Y and the first feedback resource pool configuration information, the first terminal sends the first feedback resource used by the first feedback information to the base station, and the first terminal repeatedly sends the first feedback information Y times through the first feedback resource, where Y is a positive integer greater than or equal to (0.75 × X) and less than or equal to X.
Step S3, the second terminal conforming to the configuration information of the auxiliary terminal successfully receives the first feedback information on the first feedback resource, and the second terminal and the base station use the same resource to jointly send the second multicast information.
Step S4, the first terminal tries to receive the second multicast information, if the reception is successful, the first terminal sends the uplink random access channel based on the second multicast information, and if the reception is unsuccessful, the first terminal sends the second feedback information that the reception is unsuccessful on the second feedback resource.
Step S5, after the base station successfully receives the second feedback information, increasing the time-frequency resource used for subsequently sending the second multicast information, and sending the second multicast information together with the base station by using the same resource when the electric quantity of the second terminal is required to be informed to be more than N%, wherein N is an integer which is more than or equal to M and less than or equal to 100; and the base station repeatedly transmits the updated first multicast information X times.
Step S6, after the second terminal receives the first multicast information sent by the base station for Z times, the second terminal successfully decodes the first multicast information, and when the power of the second terminal is greater than N%, the second terminal repeatedly transmits the remaining (X-Z) times of the first multicast information using the same time-frequency resource as the base station, where Z is an integer greater than 0 and smaller than X.
Example 1
The base station divides the multicast information into first multicast information and second multicast information, wherein the first multicast information at least comprises configuration information of the second multicast information, configuration information of a first feedback resource pool and configuration information of an auxiliary terminal, the second multicast information at least comprises configuration information of a random access channel and configuration information of a second feedback resource, the configuration information of the auxiliary terminal at least comprises indication information for informing terminals in a connection state and with electric quantity more than or equal to M% to assist in sending the second multicast information, and M is an integer more than or equal to 80 and less than or equal to 100.
And the base station repeatedly transmits the first multicast information for X times, wherein X is an integer greater than or equal to 32. This has the advantage that by repeatedly sending the first multicast information a number of times it is ensured that the terminal can successfully receive the information with a very high probability.
After receiving the first multicast information sent by the base station for Y times, the first terminal which does not perform uplink synchronization successfully decodes the first multicast information, determines, according to the Y and the first feedback resource pool configuration information, a first feedback resource used by the first terminal to send the first feedback information to the base station, and repeatedly sends the first feedback information for Y times through the first feedback resource, wherein Y is a positive integer which is greater than or equal to (0.75X) and less than or equal to X.
And the second terminal which accords with the configuration information of the auxiliary terminal successfully receives the first feedback information on the first feedback resource, and the second terminal and the base station use the same resource to jointly send the second multicast information. The method has the advantages that more communication nodes in the network can cooperate with the base station to send important system information to other terminals, the system overhead is reduced, and meanwhile the success probability of receiving the second multicast information is effectively improved.
The first terminal tries to receive the second multicast information, if the reception is successful, the first terminal sends an uplink random access channel based on the second multicast information, and if the reception is failed, the first terminal sends second feedback information of which the reception is failed on the second feedback resource.
And after the base station successfully receives the second feedback information, increasing time-frequency resources used for subsequently sending the second multicast information, and sending the second multicast information together with the base station by using the same resources when the electric quantity of the second terminal is required to be informed to be more than N%, wherein N is an integer which is more than or equal to M and less than or equal to 100. The base station can actively increase the resources used for sending the second multicast information after finding that the quality of the wireless channel has problems, thereby allowing the second terminal to further reduce the probability of sending the second multicast information by self assistance and improving the standby time of the second terminal
The base station repeatedly transmits the updated first multicast information X times.
And after the second terminal receives the first multicast information sent by the base station for Z times, the first multicast information is successfully decoded, and when the electric quantity of the second terminal is more than N%, the second terminal repeatedly transmits the remaining (X-Z) times of first multicast information by using the time-frequency resource same as that of the base station. This has the advantage of further increasing the probability of the terminal successfully receiving the first multicast information, and ensuring the quality of service for the users at the cell edge, where Z is an integer greater than 0 and smaller than X.
Example 2
On the basis of embodiment 1, the configuration information of the second multicast information at least includes a time-frequency resource location used for sending the second multicast information.
Example 3
Based on embodiment 1, the first feedback resource pool includes (0.25 × X) candidate first feedback resources, and the number of times of repeated transmission of the first feedback information supported by the candidate first feedback resources is (0.75 × X), (0.75 × X + 1), (0.75 × X + 2), … …, (X-2), (X-1), and X, respectively. The reason for this is that different terminals need to decode the first multicast information with different times due to different wireless channel conditions, and when the times that the terminals need to decode the first multicast information with success exceed a certain threshold, the terminal is in a poor channel environment, and when receiving the second multicast information, there is a high probability that the second multicast information cannot be received, the base station needs to be notified of the information, and the base station performs subsequent processing according to the information.
Example 4
On the basis of embodiment 1, the second feedback resource configuration information only includes one second feedback resource, and the number of times of repeated sending of the second feedback information supported by the second feedback resource is X. This has the advantage that if the terminal fails to receive the second multicast information, which indicates that there is a problem in network planning of the communication system, the plurality of terminals that failed to receive the second feedback information can share the second feedback resource, and the content transmitted on the second feedback resource is repeatedly transmitted for a plurality of times to ensure successful reception by the base station.
Example 5
On the basis of embodiment 1, the strength of the downlink synchronization signal received by the second terminal and sent by the base station is less than or equal to 5 dB. The reason for this is that the probability that the second multicast information reception failure exists in the users at the edge of the general cell is far greater than that of the users smaller than the central user, so that the second terminal, which is close to the edge of the cell and has already accessed the system and is in a connected state, assists the base station to send the second multicast information to the first terminal, which is smaller than the edge and has not accessed the system, so that the transmission efficiency of the second multicast information and the spectrum efficiency of the whole system can be effectively improved.
Example 6
On the basis of embodiment 5, if the signal strength of the first feedback information successfully received by the second terminal is S, and the maximum transmission power of the second terminal is P, the power of the second terminal for sending the second multicast information is (P-S). This has the advantage of minimizing the power consumption of the second terminal and increasing the standby time of the second terminal.
Example 7
On the basis of embodiment 6, when the signal strength of the first feedback information received by the second terminal is S, S should be greater than or equal to 10 dB. The reason for this is that it is desirable that the distance between the second terminal and the first terminal is as close as possible, thereby reducing power consumption of the second terminal and increasing standby time of the second terminal.
Example 8
On the basis of embodiment 1, if the second terminal needs to receive other data information sent to it by the base station in a partial time range in which the base station sends the second multicast information, the second terminal does not need to send the second multicast information in the partial time range. This has the advantage that the quality of network service of the system to the second terminal is guaranteed as much as possible.
Example 9
On the basis of embodiment 1, if the signal strength of the first feedback information successfully received by the base station is less than 0dB, the base station can only provide service to a third terminal within the transmission time range of the second multicast information, where the third terminal is a terminal whose channel quality information fed back to the base station is greater than 10 dB. The reason for this is that the wireless channel environment of the first terminal and the base station is poor, the base station needs to allocate more power to the resource for sending the second multicast information to improve the probability of the first terminal successfully acquiring the second multicast information, and the available power on other resources in the same time period is less, so that the base station can only provide service to a third terminal with good channel quality close to the base station.
Example 10
On the basis of embodiment 1, if the signal strength of the first feedback information successfully received by the base station is less than-5 dB, the base station can only send the second multicast information within the sending time range of the second multicast information. The reason for this is that the wireless channel environment between the first terminal and the base station is very poor, and the base station needs to allocate all power to the resource for transmitting the second multicast information to improve the probability of successfully acquiring the second multicast information by the first terminal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method for sending the multicast data in the Internet of things is characterized by comprising the following steps:
s1, the base station divides the multicast information into first multicast information and second multicast information and repeatedly sends the first multicast information for X times;
s2, after receiving the first multicast information sent by the base station Y times, the first terminal that does not perform uplink synchronization successfully decodes the first multicast information, and determines, according to Y and the first feedback resource pool configuration information, a first feedback resource used by the first terminal to send first feedback information to the base station, and the first terminal repeatedly sends the first feedback information Y times through the first feedback resource;
s3, the second terminal conforming to the configuration information of the auxiliary terminal successfully receives the first feedback information on the first feedback resource, and the second terminal and the base station use the same resource to jointly send the second multicast information;
s4, determining whether the first terminal attempts to receive the second multicast information successfully, if the reception is successful, the first terminal sends an uplink random access channel based on the second multicast information and executes the next step, and if the reception is unsuccessful, the first terminal sends the second feedback information of which the reception is unsuccessful on the second feedback resource;
s5, after the base station successfully receives the second feedback information, increasing time-frequency resources used for subsequently sending the second multicast information, and sending the second multicast information together with the base station by using the same resources only when the electric quantity of the second terminal is required to be informed to be more than N%, and the base station repeatedly sends the first multicast information updated for X times;
s6, after the second terminal receives the first multicast information sent by the base station for Z times, the second terminal successfully decodes the first multicast information, and when the electric quantity of the second terminal is more than N%, the second terminal repeatedly transmits the remaining (X-Z) times of first multicast information by using the time-frequency resource same as that of the base station;
wherein X is an integer of 32 or more, Y is a positive integer of 0.75X to 100 or more, N is an integer of 0 to X or more, and Z is an integer of 0 to X or more.
2. The method according to claim 1, wherein the first multicast information at least includes configuration information of the second multicast information, configuration information of a first feedback resource pool, and configuration information of an auxiliary terminal, the second multicast information at least includes configuration information of a random access channel and configuration information of a second feedback resource, the configuration information of the auxiliary terminal at least includes indication information for notifying a terminal in a connected state that an electric quantity is greater than or equal to M% to assist in sending the second multicast information, and M is an integer greater than or equal to 80 and less than or equal to 100.
3. The method according to claim 2, wherein the first feedback resource pool includes (0.25 × X) candidate first feedback resources, and the first feedback information supported by the candidate first feedback resources has repeated transmission times of (0.75 × X), (0.75 × X + 1), (0.75 × X + 2), … …, (X-2), (X-1), and X, respectively.
4. The method for sending multicast data in the internet of things according to claim 3, wherein the second feedback resource configuration information only includes one second feedback resource, and the number of times of the repeated sending of the second feedback information supported by the second feedback resource is X.
5. The method for sending multicast data in the internet of things according to claim 4, wherein the signal strength of the first feedback information successfully received by the second terminal is S, and the maximum transmission power of the second terminal is P, then the power for the second terminal to send the second multicast information is (P-S).
6. The method for sending the multicast data in the internet of things according to claim 5, wherein the strength of the downlink synchronization signal sent by the base station and received by the second terminal is less than or equal to 5 dB; and when the signal strength of the first feedback information received by the second terminal is S, the S is more than or equal to 10 dB.
7. The method for sending multicast data in the internet of things according to claim 6, wherein if the second terminal needs to receive other data information sent to it by the base station in a partial time range in which the base station needs to send the second multicast information, the second terminal does not need to send the second multicast information in the partial time range.
8. The method of claim 7, wherein if the signal strength of the first feedback information successfully received by the base station is less than 0dB, the base station is only able to provide service to a third terminal within the sending time range of the second multicast information, and the third terminal is a terminal that has channel quality information fed back by the base station greater than 10 dB.
9. The method for sending multicast data in the internet of things according to claim 8, wherein if the signal strength of the first feedback information successfully received by the base station is less than-5 dB, the base station can only send the second multicast information within the sending time range of the second multicast information.
10. The method for sending multicast data in the internet of things according to claim 9, wherein the configuration information of the second multicast information at least includes a time-frequency resource location used for sending the second multicast information.
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