CN111083781A

CN111083781A - Transmission method and device of PDCCH (physical Downlink control channel) information

Info

Publication number: CN111083781A
Application number: CN201811215195.6A
Authority: CN
Inventors: 安思麒
Original assignee: Potevio Information Technology Co Ltd
Current assignee: Potevio Information Technology Co Ltd
Priority date: 2018-10-18
Filing date: 2018-10-18
Publication date: 2020-04-28

Abstract

The embodiment of the invention provides a method and a device for transmitting PDCCH information. The method comprises the following steps: when the repetition time of the PDCCH is 1 and the PDCCH period factor is F, obtaining a configurable subset of PDCCH deviation values according to the configuration of a complete set of PDCCH deviation values, wherein the complete set of PDCCH deviation values is {0,1/8,1/4,3/8,1/2 }; calculating the sending time Sfn of the PDCCH according to the configurable subset of the PDCCH deviation value; and sending PDCCH information to the terminal according to the sending time of the PDCCH. The embodiment of the invention can avoid the PDCCH deviation value subset of the synchronous frame time by configuring the terminal for appointing the repetition times of the PDCCH, so that the PDCCH sent by the base station through the special search space can avoid the synchronous frame, the problem of first start delay is effectively solved, and the error code of the next period caused by the error code of the previous period is also avoided, thereby reducing the service delay, ensuring the throughput of a user and improving the utilization rate of the system.

Description

Transmission method and device of PDCCH (physical Downlink control channel) information

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for transmitting PDCCH information.

Background

An LTE (Long Term Evolution )230 system is a wireless network that operates in a 230MHz frequency band and is oriented to applications such as power system data acquisition, power distribution control, and video communication.

A PDCCH (Physical Downlink Control Channel) is used to transmit Information for a Downlink, and the transmitted content is DCI (Downlink Control Information). The LTE230 system reserves one radio frame as a special synchronization frame per 40 radio frames by default for transmitting synchronization signals. If the repetition frequency of the PDCCH configuration is 1, namely the PDCCH adopts a single-frame transmission mode, and the PDCCH is not transmitted when a synchronous frame is encountered. In order to ensure throughput, the LTE230 system provides that the base station and the UE (User Equipment) in such a scenario use the DCI in the previous period as a scheduling grant in this period by default.

However, if the data transmission is started for the first time and the synchronous frame is encountered, the data transmission is delayed by one period, so that the service delay is increased, and the throughput of the UE is reduced. In addition, in the process of data transmission, if the UE channel condition is not good or there is interference, and the PDCCH in the previous cycle of the synchronization frame is not successfully received, the base station may continue to use the authorization information in the previous cycle for data transmission or reception when it is not time to determine the ACK (acknowledgement character) in the previous cycle in the current cycle, and the transmission in the current cycle is definitely failed. This wastes one PDCCH cycle and reduces UE throughput and system utilization.

Disclosure of Invention

Aiming at the problems in the prior art, the embodiments of the present invention provide a method and an apparatus for transmitting PDCCH information.

In one aspect, an embodiment of the present invention provides a method for transmitting PDCCH information, where the method includes:

when the repetition time of the PDCCH is 1 and the PDCCH period factor is F, obtaining a configurable subset of PDCCH deviation values according to the configuration of a complete set of PDCCH deviation values, wherein the complete set of PDCCH deviation values is {0,1/8,1/4,3/8,1/2 };

and calculating the sending time Sfn of the PDCCH according to the configurable subset of the PDCCH deviation value, wherein the calculation formula of the Sfn is as follows:

Sfn＝F*n+PDCCH-Offset*F

wherein, the PDCCH-Offset value is an Offset value in the configurable subset, and n is an integer;

and sending PDCCH information to the terminal according to the sending time of the PDCCH.

In another aspect, an embodiment of the present invention provides a device for transmitting PDCCH information, where the device includes:

a configuration unit, configured to obtain a configurable subset of PDCCH offset values according to a full set of PDCCH offset values when the number of PDCCH repetitions is 1 and a PDCCH periodicity factor is F, where the full set of PDCCH offset values is {0,1/8,1/4,3/8,1/2 };

a calculating unit, configured to calculate a sending time Sfn of the PDCCH according to the configurable subset of the PDCCH offset value, where a calculation formula of Sfn is as follows:

Sfn＝F*n+PDCCH-Offset*F

and the sending unit is used for sending the PDCCH information to the terminal according to the sending time of the PDCCH.

On the other hand, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the transmission method for PDCCH information as described above when executing the program.

In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the transmission method for PDCCH information as described above.

The embodiment of the invention can avoid the PDCCH deviation value subset of the synchronous frame time by configuring the terminal for appointing the repetition times of the PDCCH, so that the PDCCH sent by the base station through the special search space can avoid the synchronous frame, the problem of first start delay is effectively solved, and the error code of the next period caused by the error code of the previous period is also avoided, thereby reducing the service delay, ensuring the throughput of a user and improving the utilization rate of the system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a method for transmitting PDCCH information according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for screening PDCCH offset values according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an apparatus for transmitting PDCCH information according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 shows a flowchart of a method for transmitting PDCCH information according to an embodiment of the present invention.

As shown in fig. 1, the method for transmitting PDCCH information according to the embodiment of the present invention specifically includes the following steps:

s11, when the repetition frequency of the PDCCH is 1 and the PDCCH period factor is F, obtaining a configurable subset of the PDCCH deviation value according to the full set configuration of the PDCCH deviation value, wherein the full set of the PDCCH deviation value is {0,1/8,1/4,3/8,1/2 };

specifically, the number of repetitions of the PDCCH is the number of radio frames occupied by each data transmission, and if the number of repetitions of the PDCCH is 1, one radio frame is used to transmit data, that is, a PDCCH single frame is transmitted. The cycle factor of the PDCCH is the ratio of the control information to the whole cycle in one-time scheduling, and if the cycle factor is 2, the control information accounts for 1/2 of the whole scheduling cycle. The value range of the periodicity factor of the PDCCH is {1,2,4,8,16,32,48,64 }.

Specifically, the embodiment of the present invention utilizes the characteristic that the synchronization frame number is multiple of 40, and the transmission time of the PDCCH obtained according to the configured offset value is not divided by 40, so as to obtain the offset value capable of avoiding the synchronization frame.

Specifically, for a packet ping (packet internet group) packet service, in order to obtain a lower delay, a periodicity factor needs to be configured to be 2, the total set of PDCCH offset values is {0,1/8,1/4,3/8}, and when the periodicity factor is 2, a synchronization frame cannot be avoided.

Therefore, the embodiment of the present invention adds a PDCCH offset value of 1/2, which is specially used as a PDCCH offset value when the periodicity factor is 2, and the sending time is 2n +1, so that it is possible to avoid encountering a synchronization frame and reduce the delay.

In the embodiment of the invention, under the condition that the repetition frequency of the PDCCH is 1, the PDCCH offset value subsets which can avoid the synchronous frame time are configured for the terminal according to different period factors, and the special search space of the PDCCH is obtained, so that the PDCCH sent by the base station through the special search space can avoid encountering the synchronous frame.

S12, calculating the sending time Sfn of the PDCCH according to the configurable subset of the PDCCH offset value, wherein the calculation formula of Sfn is as follows:

Sfn＝F*n+PDCCH-Offset*F

the calculation formula of the sending time Sfn of the PDCCH provided by the embodiment of the present invention can avoid the synchronization frame as long as the calculated Sfn is not evenly divided by 40.

S13, sending PDCCH information to the terminal according to the sending time of the special PDCCH.

Specifically, the PDCCH-dedicated search space gives a transmission timing at which the base station can avoid encountering a synchronization frame, and the base station transmits PDCCH information to the terminal according to the transmission timing.

Specifically, as long as the transmission time Sfn of the PDCCH is not evenly divided by 40, the synchronization frame can be avoided, and the calculation formula of Sfn can be obtained as follows:

when the repetition frequency of the PDCCH is 1 and the PDCCH period factor is 2, the configurable subset of the PDCCH offset value is {1/2}, and the transmission time of the PDCCH is {2n +1 };

when the repetition time of the PDCCH is 1 and the PDCCH period factor is 4, the configurable subset of the PDCCH offset value is {1/4, 1/2}, and the transmission time of the PDCCH is {4n +1, 4n +2 };

when the repetition number of the PDCCH is 1 and the PDCCH period factor is 8, the configurable subset of the PDCCH offset value is {1/8, 1/4,3/8 and 1/2}, and the transmission time of the PDCCH is {8n +1, 8n +2, 8n +3 and 8n +4 };

when the repetition number of the PDCCH is 1 and the PDCCH period factor is 16, the configurable subset of the PDCCH offset value is {1/8, 1/4,3/8}, and the transmission time of the PDCCH is {16n +2, 16n +4, 16n +6 };

when the repetition number of PDCCH is 1 and the PDCCH period factor is 32, the configurable subset of the PDCCH offset value is {1/8, 3/8}, and the transmission time of PDCCH is {32n +4, 32n +12 };

when the number of repetitions of PDCCH is 1 and the PDCCH periodicity factor is 48, the configurable subset of PDCCH offset values is {1/8, 1/4,3/8} and the transmission time of PDCCH is {48n +6, 48n +12, 48n +18 }.

In particular, table 1 shows PDCCH offset values that may be selected for different PDCCH periodicity factors.

TABLE 1

PDCCH periodicity factorF	PDCCH-Offset set	PDCCH transmission time
			2	{1/2}	{2n+1}
4	{1/4，1/2}	{4n+1，4n+2}
			8	{1/8，1/4，3/8，1/2}	{8n+1，8n+2，8n+3，8n+4}
16	{1/8，1/4，3/8}	{16n+2，16n+4，16n+6}
			32	{1/8，3/8}	{32n+4，32n+12}
48	{1/8，1/4，3/8}	{48n+6，48n+12，48n+18}
			64	{NULL}

As shown in table 1, the PDCCH-Offset set is a configurable subset of PDCCH Offset values.

Specifically, for a PDCCH periodicity factor of 64, a synchronization frame cannot be avoided, and at this time, the periodicity factor is adjusted to an adjacent periodicity factor, the periodicity factor 64 is adjusted to 48, and the periodicity factor is finely adjusted, so that the system performance is not affected.

Specifically, the method further comprises:

resetting a periodicity factor when the number of configurable offset values in the configurable subset of PDCCH offset values is 0.

When the number of repetitions of the PDCCH is 1 and the PDCCH periodicity factor is 64, the periodicity factor is reset to 48.

Specifically, when the PDCCH periodicity factor is 64, the number of configurable offset values in the configurable subset of PDCCH offset values is 0, which cannot avoid a synchronization frame, and at this time, the periodicity factor is adjusted to an adjacent periodicity factor, the periodicity factor 64 is adjusted to 48, and the periodicity factor is finely adjusted, which does not affect the system performance.

With reference to table 1, an embodiment of the present invention further provides a method for screening PDCCH offset values.

Fig. 2 is a flowchart illustrating a method for screening a PDCCH offset value according to an embodiment of the present invention.

As shown in fig. 2, the method for screening a PDCCH offset value provided in the embodiment of the present invention specifically includes the following steps:

1. starting, UE applies for configuring a PDCCH offset value;

2. initializing a subset of available PDCCH offsets for the UE as a full set {0,1/8,1/4,3/8,1/2 };

3. acquiring the PDCCH repetition times of the UE, if the PDCCH repetition times is 1, executing the next step, otherwise, turning to the step 7;

4. obtaining a PDCCH cycle factor F of UE, and looking up a table 1 to obtain a configurable subset of a PDCCH deviation value;

5. if the number of the configurable deviation values in the obtained subset is 0, executing the step 6, otherwise, turning to the step 7;

6. resetting the PDCCH periodicity factor F: assigning 64 as 48, and turning to the step 4;

7. returning the obtained PDCCH offset subset to the UE;

8. and (6) ending.

The embodiment of the invention screens out the PDCCH deviation values available to the UE under various PDCCH periodic factors by utilizing the characteristics of the synchronous frame, and adds a PDCCH deviation value 1/2 to ensure the time delay requirement of the small packet ping packet. The screened user PDCCH deviation value can enable the UE with the PDCCH repetition frequency of 1 to avoid the sending time of the synchronous frame, thereby not only ensuring the service throughput, but also avoiding the error code of the period caused by the error code of the previous period.

The embodiment of the invention also provides a transmission device of the PDCCH information.

Fig. 3 is a schematic structural diagram illustrating an apparatus for transmitting PDCCH information according to an embodiment of the present invention.

As shown in fig. 3, the apparatus for transmitting PDCCH information according to the embodiment of the present invention includes a configuration unit 11, a calculation unit 12, and a transmission unit 13, where:

the configuration unit 11 is configured to, when the number of repetitions of the PDCCH is 1 and the PDCCH periodicity factor is F, configure a configurable subset of PDCCH offset values according to a full set of PDCCH offset values, where the full set of PDCCH offset values is {0,1/8,1/4,3/8,1/2 };

The calculating unit 12 is configured to calculate a sending time Sfn of the PDCCH according to the configurable subset of the PDCCH offset value, where a calculation formula of Sfn is as follows:

Sfn＝F*n+PDCCH-Offset*F

The sending unit 13 is configured to send PDCCH information to the terminal according to the sending time of the PDCCH.

Specifically, the apparatus further comprises:

a resetting unit, configured to reset a periodicity factor when the number of configurable offset values in the configurable subset of PDCCH offset values is 0.

Specifically, the resetting unit is configured to reset the periodicity factor to 48 when the PDCCH has a repetition number of 1 and a PDCCH periodicity factor of 64.

The functional modules in the embodiments of the present invention may be implemented by a hardware processor (hardware processor), and the embodiments of the present invention are not described again.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

An embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method shown in fig. 1 is implemented.

As shown in fig. 4, the electronic device provided by the embodiment of the present invention includes a memory 21, a processor 22, a bus 23, and a computer program stored on the memory 21 and executable on the processor 22. The memory 21 and the processor 22 complete communication with each other through the bus 23.

The processor 22 is used to call the program instructions in the memory 21 to implement the method of fig. 1 when executing the program.

For example, the processor implements the following method when executing the program:

Sfn＝F*n+PDCCH-Offset*F

The electronic equipment provided by the embodiment of the invention can avoid the PDCCH deviation value subset of the synchronous frame time by configuring the terminal for appointing the repetition times of the PDCCH, so that the PDCCH sent by the base station through the special search space can avoid the synchronous frame, the problem of first start delay is effectively solved, and the error code of the next period caused by the error code of the previous period is also avoided, thereby reducing the service delay, ensuring the throughput of a user and improving the utilization rate of the system.

Embodiments of the present invention also provide a non-transitory computer readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the steps of fig. 1.

Sfn＝F*n+PDCCH-Offset*F

The non-transitory computer readable storage medium provided in the embodiment of the present invention configures a PDCCH offset value subset capable of avoiding a synchronization frame time by configuring a terminal that specifies the number of repetitions of a PDCCH, so that a PDCCH transmitted by a base station through a dedicated search space can avoid encountering a synchronization frame, thereby effectively solving a problem of a first start delay and avoiding a next cycle error caused by a previous cycle error, thereby reducing service delay, ensuring user throughput, and improving system utilization.

An embodiment of the present invention discloses a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including:

Sfn＝F*n+PDCCH-Offset*F

Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for transmitting PDCCH information, the method comprising:

Sfn＝F*n+PDCCH-Offset*F

2. The method of claim 1, wherein the calculating the transmission time instant Sfn of the PDCCH according to the configurable subset of PDCCH offset values comprises:

3. The method of claim 1, further comprising:

4. The method of claim 3, wherein resetting a periodicity factor when the number of configurable offset values in the configurable subset of PDCCH offset values is 0 comprises:

5. An apparatus for transmitting PDCCH information, the apparatus comprising:

Sfn＝F*n+PDCCH-Offset*F

6. The apparatus of claim 5,

7. The apparatus of claim 5, further comprising:

8. The apparatus of claim 7,

the resetting unit is configured to reset the periodicity factor to 48 when the PDCCH has a repetition number of 1 and a PDCCH periodicity factor of 64.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method for transmitting PDCCH information according to any of claims 1 to 4.

10. A non-transitory computer readable storage medium, having stored thereon a computer program, which, when being executed by a processor, performs the steps of the method for transmitting PDCCH information as set forth in any one of claims 1 to 4.