CN111901884A - Scheduling request sending method and device of multi-sub-band communication system - Google Patents

Abstract

The embodiment of the invention provides a scheduling request sending method and a device of a multi-sub-band communication system, wherein the scheduling request sending method comprises the following steps: acquiring a ZC sequence group adopted by a cell when a Scheduling Request (SR) signal is sent, wherein the SR signal corresponds to a ZC sequence set, the ZC sequence set comprises M ZC sequences with different root parameters, the ZC sequences in the ZC sequence set are equally divided into 8 groups, and each cell is allocated with one ZC sequence group, wherein M is an integral multiple of 8; transmitting the SR signal based on the ZC sequence group. The embodiment shortens the time of the user scheduling request.

Description

Method and device for sending scheduling request in multi-subband communication system

technical field

The present invention relates to the field of communication technologies, and in particular, to a method and device for sending a scheduling request in a multi-subband communication system.

Background technique

The authorized frequency points of a multi-subband communication system are discretely distributed in a frequency band of 223.525MHz to 231.65MHz, and each bandwidth is 25KHz, which is called a physical subband. Among them, part of the frequency points are separately divided as the resident area, and the rest of the frequency points are used as the working area, and the resident area sub-band can be further divided into a synchronization sub-band and a service sub-band. The position of uplink pilot time slot physical channel (UPpts) on each service subband is allocated as the position of Scheduling Request (SR), and 8 preambles (Preamble) are generated at this position through cyclic shift.

In order to prevent the interference of adjacent cells, in every 8 radio frames, each cell can be allocated an UpPTS time slot for uplink SR transmission. The radio frame in which each cell transmits can be determined by the cell ID number modulo 8 and the frame number Modulo 8 is determined in a corresponding manner.

In the SR channel structure of the existing multi-subband communication system, the scheduling request starts from a radio frame whose frame number modulo SR period is 0, and the communication terminal calculates the corresponding uplink scheduling request time domain index (index =0-7), and select an SR from the uplink scheduling request time domain corresponding to the index to attempt the uplink scheduling request. A user in the same cell transmits once in the SR period.

However, because the terminal in the same cell in the current system has a scheduling request opportunity within the SR period, at this time, the terminal with poor coverage needs to perform repeated transmission, which will lead to a long SR period interval, and the user needs to wait for the arrival of uplink services. It takes a longer time to have the opportunity to make a business request.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method and device for sending a scheduling request in a multi-subband communication system, so as to shorten the time for a user's scheduling request.

An embodiment of the present invention provides a scheduling request sending method for a multi-subband communication system, where the scheduling request sending method includes:

Obtain the ZC sequence group used by the cell when sending the scheduling request SR signal, wherein the SR signal corresponds to a ZC sequence set, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequence set in the ZC sequence set The ZC sequences are divided into 8 groups, and a ZC sequence group is allocated to each cell, and M is an integer multiple of 8;

The SR signal is sent based on the ZC sequence group.

Optionally, before the SR signal is sent based on the ZC sequence group, the scheduling request sending method further includes:

Determine the transmission period of the SR signal; where,

The sending period is the product of the user dwell factor and the number of times of SR repeated sending, and the user dwell factor is 100×N/(M/8), where N is a positive integer greater than or equal to 1.

Optionally, the value of M is 8, 16, 24 and 32.

Optionally, the sending the SR signal based on the ZC sequence group includes:

For each ZC sequence in the ZC sequence group, discrete Fourier transform is performed on the ZC sequence to obtain a frequency domain signal sequence of the ZC sequence;

Padding zeros in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value;

Perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence to obtain the SR basic transmission sequence;

The SR signal is transmitted through the SR basic transmission sequence.

An embodiment of the present invention provides a scheduling request sending apparatus for a multi-subband communication system, where the scheduling request sending apparatus includes:

The acquisition module is used to acquire the ZC sequence group used by the cell when sending the scheduling request SR signal, wherein the SR signal corresponds to a ZC sequence set, and the ZC sequence set includes M ZC sequences with different root parameters, and all The ZC sequences in the described ZC sequence set are equally divided into 8 groups, and a ZC sequence group is allocated to each cell, and M is an integer multiple of 8;

A sending module, configured to send the SR signal based on the ZC sequence group.

Optionally, the scheduling request sending apparatus further includes:

A determination module, used to determine the transmission period of the SR signal; wherein,

The sending period is the product of the user dwell factor and the number of times of SR repeated sending, and the user dwell factor is 100×N/(M/8), where N is a positive integer greater than or equal to 1.

Optionally, the value of M is 8, 16, 24 and 32.

Optionally, the sending module includes:

a first acquisition unit, for performing discrete Fourier transform on the ZC sequence for each ZC sequence in the ZC sequence group, to obtain a frequency domain signal sequence of the ZC sequence;

a zero-filling unit, used for filling zeros in the frequency-domain signal sequence of the ZC sequence until the sequence length reaches a preset value;

The second acquisition unit is used to perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence to obtain the SR basic transmission sequence;

A sending unit, configured to send an SR signal through the SR basic sending sequence.

An embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the multi-subband communication system when the processor executes the program. The steps of the dispatch request sending method.

Embodiments of the present invention provide a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of the method for sending a scheduling request of a multi-subband communication system.

The method and device for sending a scheduling request for a multi-subband communication system provided by the embodiments of the present invention correspond to a ZC sequence set based on the SR signal, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequence set in the ZC sequence set The ZC sequences are divided into 8 groups, and a group of ZC sequences is allocated to each cell, so that when the cell sends an SR signal, it can first obtain the ZC sequence group used by the cell when sending the SR signal, and send the SR based on the ZC sequence group. Signal, realizes that a cell can send SR signal based on a set of ZC sequences, thus realizes that under the premise of the same number of SR repeated transmissions, the user scheduling request time is shortened, and more SR signals can be accommodated in the same time and frequency resources. resident user.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a flowchart of steps of a method for sending a scheduling request in a multi-subband communication system according to an embodiment of the present invention;

2 is a schematic structural diagram of an SR in an embodiment of the present invention;

3 is a block diagram of a module of an apparatus for sending a scheduling request of a multi-subband communication system in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an electronic device in an embodiment of the present invention.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1, it is a flowchart of the steps of a method for sending a scheduling request in a multi-subband communication system in an embodiment of the present invention. The method for sending a scheduling request includes:

Step 101: Obtain the ZC sequence group used by the cell when sending the scheduling request SR signal.

In this step, specifically, the scheduling request (SR) signal adopts the ZC sequence.

In this embodiment, the SR signal corresponds to a ZC sequence set, and the ZC sequence set includes M ZC sequences with different root parameters; in addition, the ZC sequences in the ZC sequence set are equally divided into 8 groups, and each A cell is allocated one ZC sequence group, that is, M/8 ZC sequences are allocated to each cell. Among them, M is an integer multiple of 8.

Specifically, the value of M can be 8, 16, 24 and 32. At this time, the ZC sequences in the ZC sequence set are further divided into 8 groups, and when a group of ZC sequences is allocated to each cell, each cell can be allocated 1, 2, 3 or 4 ZC sequences.

At this time, taking the transmission period of the SR as one radio frame (25 ms) as an example, the SR channel structure may be as shown in FIG. 2 . In Figure 2, the first group (group 1) of ZC sequence groups is allocated to cell 1 (cell1), the second group (group 2) of ZC sequence groups is allocated to cell 2 (cell2), and the third group (group 2) of ZC sequence groups is allocated to cell 3 (cell3) Group (group 3) ZC sequence group, assign the fourth group (group 4) ZC sequence group to cell 4 (cell4), assign the fifth group (group 5) ZC sequence group to cell 5 (cell5), and assign the fifth group (group 5) ZC sequence group to cell 6 (cell6) ) allocates the sixth (group 6) ZC sequence group, allocates the seventh (group 7) ZC sequence group to the cell 7 (cell7), and allocates the eighth (group 8) ZC sequence group to the cell 8 (cell8). This implements the assignment of multiple ZC sequences to each cell, and further implements the use of code partitions to divide different cells, so as to reduce the user scheduling request time.

In addition, specifically, the value of M is 32 for illustration here. When the value of M is 32, that is, the ZC sequence set includes 32 ZC sequences with different root parameters. At this time, the 32 root parameters can be 1-3, 5-11, 14-21, 24, 25, 27-31, 33, 36, 38 and 42, and for the uplink pilot time slot physical channel of one subband (UPpts) position is allocated as the position of SR request, 32 ZC sequences with different root parameters can be divided into 8 groups, and each group of 4 ZC sequences is used for SR transmission. At this time, specifically, 32 ZC sequences with different root parameters can be grouped according to the following table:

In addition, specifically, this step can acquire the ZC sequence group used by the cell when sending the SR signal, so that the cell can send the SR based on the ZC sequence group.

Step 102: Send an SR signal based on the ZC sequence group.

In this step, specifically, the cell transmits the SR signal based on the ZC sequence group, which implements the code division method to distinguish the cell, thereby reducing the SR scheduling period under the same coverage level.

In addition, on the basis of the above embodiment, before sending the SR signal based on the ZC sequence group, this embodiment also needs to determine the sending period of the SR signal.

The transmission period is the product of the user dwell factor and the number of times of repeated SR transmission, the user dwell factor is 100×N/(M/8), and N is a positive integer greater than or equal to 1.

Specifically, the unit of the user dwell factor is milliseconds. In addition, when the number of repeated transmissions is 1, when a silent frame is encountered, the SR signal is sent with a delay of one transmission period.

In this way, through the value method of the above-mentioned user residency factor, the transmission period of the SR is related to the number of ZC sequences included in the ZC sequence set, so that the value of M can be adjusted, that is, the ZC sequences included in the ZC sequence set can be adjusted. The number of sequences is adjusted to adjust the number of ZC sequence groups used by the cell when sending the SR signal, thereby shortening the time for scheduling requests.

Here, the specific effects of the above-mentioned embodiments will be described through specific examples.

For example, when the value of M is 32 and the value of N is 1, that is, when the user dwell factor is 25ms, if the number of SR repeated transmissions is 8, that is, the transmission period of the SR signal is 200ms. At this time, based on every 8 radio frames (200ms), each cell can be allocated one UpPTS time slot for uplink SR transmission, and users in the same cell transmit once in the SR transmission period, so in this embodiment, a The cell has an SR signal transmission opportunity every 200ms. In the existing system, when the number of SR repeated transmissions is 8, there is only one SR signal transmission opportunity in 8s, that is, compared with the existing system, the SR scheduling period in this embodiment is shortened to 1/40 of the original.

In addition, for example, here the number of times of SR retransmission is 1 as an example, when the user residency factor of the existing system is 1S, one subband can reside 35 users; and in this embodiment, when the value of M is is 32, that is, when there are 32 ZC sequences with different root parameters in the ZC sequence set, and the user residency factor is the same as 1s, a subband can reside 1240 users (31 users reside in 25ms), That is, the number of resident users is 35 times that of the existing system, so that under the same time and frequency resources, this embodiment can accommodate more resident users than the existing system.

In addition, on the basis of the above embodiment, when the SR signal is sent based on the ZC sequence group, discrete Fourier transform may be performed on the ZC sequence for each ZC sequence in the ZC sequence group to obtain the The frequency domain signal sequence of the ZC sequence; then zero-padded the frequency-domain signal sequence of the ZC sequence until the sequence length reaches a preset value; then perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence, The SR basic transmission sequence is obtained; finally, the SR signal is transmitted through the SR basic transmission sequence.

Specifically, in this embodiment, a ZC sequence needs to be generated according to the root parameter first. Among them, the ZC sequence can be generated according to the root parameter by the following formula:

Among them, x _u (n) is the ZC sequence, N _zc is the length of the ZC sequence, and u is the root parameter.

In addition, specifically, the following formula can be used to perform discrete Fourier transform on the ZC sequence to obtain the frequency domain signal sequence of the ZC sequence:

Among them, x _u (k) is the frequency domain signal sequence.

In addition, specifically, the following formula is used to fill zeros in the frequency domain signal sequence of the ZC sequence until the sequence length reaches the preset value:

Padding zeros in the middle to the NSEQ point:

其中，N_SEQ点为序列长度的预设值。

Wherein, the N _SEQ point is the preset value of the sequence length.

In addition, specifically, through the following formula, perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence to obtain the SR basic transmission sequence:

Su(n)=circshift( _ifft (X(k)), N _CP )/(N _zc /N _SEQ .

In addition, specifically, the cyclic offset can also be calculated to obtain the SR signal.

In this way, through the above process, the SR basic transmission sequence is obtained based on the ZC sequence group, so that the SR signal can be transmitted through the SR basic transmission sequence.

In addition, it should be noted here that when the SR signal is transmitted based on the ZC sequence group, the SR basic transmission sequence may also be stored directly based on the ZC sequence group to transmit the SR signal.

In the method for sending a scheduling request of a multi-subband communication system provided by this embodiment, there is a ZC sequence set corresponding to the SR signal, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequences in the ZC sequence set It is evenly divided into 8 groups, and a ZC sequence group is allocated to each cell, so that when the cell sends an SR signal, it can first obtain the ZC sequence group used by the cell when sending the SR signal, and send the SR signal based on the ZC sequence group. It is realized that a cell can send SR signals based on a set of ZC sequences, so that the user scheduling request time is shortened under the premise of the same number of SR repeated transmissions, and more dwellings can be accommodated in the same time and frequency resources. user.

In addition, as shown in FIG. 3 , it is a block diagram of a module of an apparatus for sending a scheduling request of a multi-subband communication system in an embodiment of the present invention, and the apparatus for sending a scheduling request includes:

The obtaining module 301 is used to obtain the ZC sequence group used by the cell when sending the scheduling request SR signal, wherein the SR signal corresponds to a ZC sequence set, and the ZC sequence set includes M ZC sequences with different root parameters, and The ZC sequences in the ZC sequence set are equally divided into 8 groups, and a ZC sequence group is allocated to each cell, and M is an integer multiple of 8;

The sending module 302 is configured to send the SR signal based on the ZC sequence group.

Optionally, the scheduling request sending apparatus further includes:

A determination module, used to determine the transmission period of the SR signal; wherein,

The sending period is the product of the user dwell factor and the number of times of SR repeated sending, and the user dwell factor is 100×N/(M/8), where N is a positive integer greater than or equal to 1.

Optionally, the value of M is 8, 16, 24 and 32.

Optionally, the sending module includes:

a first acquisition unit, for performing discrete Fourier transform on the ZC sequence for each ZC sequence in the ZC sequence group, to obtain a frequency domain signal sequence of the ZC sequence;

a zero-filling unit, used for filling zeros in the frequency-domain signal sequence of the ZC sequence until the sequence length reaches a preset value;

The second acquisition unit is used to perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence to obtain the SR basic transmission sequence;

A sending unit, configured to send an SR signal through the SR basic sending sequence.

In addition, it should be noted here that the sending module may also directly store the SR basic sending sequence based on the ZC sequence group, so as to send the SR signal.

The apparatus for sending a scheduling request for a multi-subband communication system provided by this embodiment corresponds to a ZC sequence set based on the SR signal, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequences in the ZC sequence set It is evenly divided into 8 groups, and a group of ZC sequences is allocated to each cell, so that when the cell sends an SR signal, it can obtain the ZC sequence group used by the cell when sending the SR signal through the acquisition module, and use the transmission module based on the ZC sequence. group, send SR signal, realize that a cell can send SR signal based on a group of ZC sequences, thus shorten the user scheduling request time under the premise of the same number of SR repeated transmissions, and can be within the same time and frequency resources. Accommodate more resident users.

In addition, as shown in FIG. 4 , which is a schematic diagram of an entity structure of an electronic device provided by an embodiment of the present invention, the electronic device may include: a processor (processor) 410, a communications interface (Communications Interface) 420, a memory (memory) 430, and a communication The bus 440, wherein the processor 410, the communication interface 420, and the memory 430 complete the communication with each other through the communication bus 440. The processor 410 may call a computer program stored in the memory 430 and run on the processor 410 to execute the methods provided in the above embodiments, for example, including: acquiring the ZC sequence group used by the cell when sending the scheduling request SR signal , wherein the SR signal corresponds to a ZC sequence set, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequences in the ZC sequence set are divided into 8 groups, and each cell is allocated A ZC sequence group, M is an integer multiple of 8; based on the ZC sequence group, the SR signal is sent.

In addition, the above-mentioned logic instructions in the memory 430 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

Embodiments of the present invention further provide a non-transitory computer-readable storage medium on which a computer program is stored, and the computer program is implemented by a processor to execute the methods provided in the foregoing embodiments, for example, including: The ZC sequence group used when scheduling the request SR signal, wherein the SR signal corresponds to a ZC sequence set, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequences in the ZC sequence set are all ZC sequences. It is divided into 8 groups, and a ZC sequence group is allocated to each cell, where M is an integer multiple of 8; based on the ZC sequence group, the SR signal is sent.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A scheduling request sending method for a multi-subband communication system, wherein the scheduling request sending method comprises: Obtain the ZC sequence group used by the cell when sending the scheduling request SR signal, wherein the SR signal corresponds to a ZC sequence set, the ZC sequence set includes M ZC sequences with different root parameters, and the ZC sequence set in the ZC sequence set The ZC sequences are divided into 8 groups, and a ZC sequence group is allocated to each cell, and M is an integer multiple of 8; The SR signal is sent based on the ZC sequence group. 2. The method for sending a scheduling request of a multi-subband communication system according to claim 1, wherein before the SR signal is sent based on the ZC sequence group, the method for sending a scheduling request further comprises: Determine the transmission period of the SR signal; where, The sending period is the product of the user dwell factor and the number of times of SR repeated sending, and the user dwell factor is 100×N/(M/8), where N is a positive integer greater than or equal to 1. 3 . The method for sending a scheduling request in a multi-subband communication system according to claim 1 or 2 , wherein the values of M are 8, 16, 24 and 32. 4 . 4. The method for sending a scheduling request in a multi-subband communication system according to claim 1, wherein the sending the SR signal based on the ZC sequence group comprises: For each ZC sequence in the ZC sequence group, discrete Fourier transform is performed on the ZC sequence to obtain a frequency domain signal sequence of the ZC sequence; Padding zeros in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value; Perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence to obtain the SR basic transmission sequence; The SR signal is transmitted through the SR basic transmission sequence. 5. An apparatus for sending a scheduling request in a multi-subband communication system, wherein the apparatus for sending a scheduling request comprises: The acquisition module is used to acquire the ZC sequence group used by the cell when sending the scheduling request SR signal, wherein the SR signal corresponds to a ZC sequence set, and the ZC sequence set includes M ZC sequences with different root parameters, and all The ZC sequences in the described ZC sequence set are equally divided into 8 groups, and a ZC sequence group is allocated to each cell, and M is an integer multiple of 8; A sending module, configured to send the SR signal based on the ZC sequence group. 6. The apparatus for sending a scheduling request of a multi-subband communication system according to claim 5, wherein the apparatus for sending a scheduling request further comprises: A determination module, used to determine the transmission period of the SR signal; wherein, The sending period is the product of the user dwell factor and the number of times of SR repeated sending, and the user dwell factor is 100×N/(M/8), where N is a positive integer greater than or equal to 1. 7 . The apparatus for sending a scheduling request in a multi-subband communication system according to claim 5 or 6 , wherein the values of M are 8, 16, 24 and 32. 8 . 8. The apparatus for sending a scheduling request of a multi-subband communication system according to claim 5, wherein the sending module comprises: a first acquisition unit, for performing discrete Fourier transform on the ZC sequence for each ZC sequence in the ZC sequence group, to obtain a frequency domain signal sequence of the ZC sequence; a zero-filling unit, used for filling zeros in the frequency-domain signal sequence of the ZC sequence until the sequence length reaches a preset value; The second acquisition unit is used to perform inverse discrete Fourier transform and cyclic shift on the zero-padded sequence to obtain the SR basic transmission sequence; A sending unit, configured to send an SR signal through the SR basic sending sequence. 9. An electronic device, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements any one of claims 1 to 4 when the processor executes the program The steps of the scheduling request sending method of the multi-subband communication system described in item. 10. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the multi-subband communication system according to any one of claims 1 to 4 is implemented The steps of the scheduling request sending method.

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