CN111901884A - Scheduling request sending method and device of multi-sub-band communication system - Google Patents
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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
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for sending a scheduling request in a multi-subband communication system.
Background
Authorized frequency points of a multi-sub-band communication system are discretely distributed on a frequency band of 223.525 MHz-231.65 MHz, each bandwidth is 25KHz, and the system is called as a physical sub-band. Wherein, the frequency points of the independent division part are used as the residence zone, the other frequency points are used as the working zone, and the residence zone sub-band can be further divided into a synchronous sub-band and a service sub-band. The uplink pilot slot physical channel (UPpts) location on each traffic subband is allocated as a Scheduling Request (SR) location where 8 preambles are generated by cyclic shift.
In order to prevent interference of adjacent cells, in every 8 radio frames, each cell can be allocated to one UpPTS timeslot for uplink SR transmission, and which radio frame each cell transmits in can be determined by a way that the cell ID number modulo 8 corresponds to the frame number modulo 8.
In an SR channel structure of an existing multi-subband communication system, a scheduling request starts at a radio frame with a frame number modulo an SR period of 0, a communication terminal calculates a corresponding uplink scheduling request time domain index (index is 0-7) according to the ID number modulo 8 of a cell where the communication terminal is located, and selects one SR from the uplink scheduling request time domain corresponding to the index to attempt an uplink scheduling request. And the users in the same cell transmit once in the SR period.
However, since the terminal in the same cell of the current system has a scheduling request opportunity in the SR period, the terminal with poor coverage needs to repeatedly transmit at this time, which results in a relatively long SR period interval time, and when an uplink service arrives, the user needs to wait for a relatively long time before having an opportunity to make a service request.
Disclosure of Invention
The embodiment of the invention provides a scheduling request sending method and device of a multi-sub-band communication system, which are used for shortening the time of a user scheduling request.
The embodiment of the invention provides a scheduling request sending method of a multi-sub-band communication system, which 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.
Optionally, before the transmitting the SR signal based on the ZC sequence group, the scheduling request transmitting method further includes:
determining a transmission period of the SR signal; wherein,
the sending period is the product of the user residence factor and the SR repeated sending times, the value of the user residence factor is 100 multiplied by N/(M/8), and N is a positive integer greater than or equal to 1.
Optionally, M takes on values of 8, 16, 24 and 32.
Optionally, the transmitting the SR signal based on the ZC sequence group includes:
performing discrete Fourier transform on each ZC sequence in the ZC sequence group to obtain a frequency domain signal sequence of the ZC sequence;
zero padding is carried out in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value;
performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain an SR basic transmission sequence;
and transmitting an SR signal through the SR basic transmission sequence.
The embodiment of the invention provides a scheduling request sending device of a multi-subband communication system, which comprises:
the system comprises an acquisition module, a scheduling module and a scheduling module, wherein the acquisition module is used for acquiring a ZC sequence group adopted by a cell when transmitting a Scheduling Request (SR) signal, 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, each cell is allocated with one ZC sequence group, and M is an integral multiple of 8;
and the sending module is used for sending the SR signal based on the ZC sequence group.
Optionally, the scheduling request sending apparatus further includes:
the determining module is used for determining the sending period of the SR signal; wherein,
the sending period is the product of the user residence factor and the SR repeated sending times, the value of the user residence factor is 100 multiplied by N/(M/8), and N is a positive integer greater than or equal to 1.
Optionally, M takes on values of 8, 16, 24 and 32.
Optionally, the sending module includes:
a first obtaining unit, configured to perform discrete fourier transform on each ZC sequence in the ZC sequence group to obtain a frequency domain signal sequence of the ZC sequence;
a zero padding unit, configured to pad zero in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value;
the second acquisition unit is used for performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain an SR basic transmission sequence;
and a transmitting unit, configured to transmit an SR signal through the SR basic transmission sequence.
The embodiment of the invention provides electronic equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of the scheduling request sending method of the multi-subband communication system when executing the program.
An embodiment of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the scheduling request transmitting method of the multi-subband communication system.
The scheduling request sending method and device of the multi-subband communication system provided by the embodiment of the invention are characterized in that a ZC sequence set is correspondingly provided based on an SR signal, 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 group of ZC sequences, so that when the cell sends the SR signal, the ZC sequence group adopted by the cell when sending the SR signal can be obtained firstly, and the SR signal is sent based on the ZC sequence group, thereby realizing that one cell can send the SR signal based on one group of ZC sequences, shortening the user scheduling request time on the premise of the same SR repeated sending times, and accommodating more resident users in the same time and frequency resources.
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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 steps of a scheduling request transmitting method of a multi-subband communication system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an SR in an embodiment of the present invention;
fig. 3 is a block diagram of a scheduling request transmitting apparatus of a multi-subband communication system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device in an embodiment of the 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.
As shown in fig. 1, a flowchart of a scheduling request sending method of a multi-subband communication system according to an embodiment of the present invention is shown, where the scheduling request sending method includes:
step 101: acquiring a ZC sequence group adopted by a cell when sending a Scheduling Request (SR) signal.
In this step, specifically, a ZC sequence is used as a Scheduling Request (SR) signal.
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 cell is allocated with one ZC sequence group, namely, M/8 ZC sequences are allocated to each cell. Wherein M is an integer multiple of 8.
Specifically, M may take on values of 8, 16, 24, and 32. At this time, when the ZC sequences in the ZC sequence set are further divided into 8 groups and a group of ZC sequences is allocated to each cell, 1,2, 3, or 4 ZC sequences may be allocated to each cell.
At this time, taking the SR transmission period as 1 radio frame (25ms) as an example, the SR channel structure can be as shown in fig. 2. In fig. 2, a cell 1(cell1) is assigned a first group (group 1) of ZC sequence groups, a cell 2(cell2) is assigned a second group (group 2) of ZC sequence groups, a cell 3(cell3) is assigned a third group (group 3) of ZC sequence groups, a cell 4(cell4) is assigned a fourth group (group 4) of ZC sequence groups, a cell 5(cell5) is assigned a fifth group (group 5) of ZC sequence groups, a cell 6(cell6) is assigned a sixth group (group 6) of ZC sequence groups, a cell 7(cell7) is assigned a seventh group (group 7) of ZC sequence groups, and a cell 8(cell8) is assigned an eighth group (group 8) of ZC sequence groups. This realizes that a plurality of ZC sequences are distributed to each cell, and further realizes that different cells are distinguished by adopting code division so as to reduce the time of user scheduling request.
Specifically, the value of M is exemplified as 32. 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 may be 1-3,5-11,14-21,24,25,27-31,33,36,38 and 42, and the uplink pilot slot physical channel (UPpts) location for one subband is allocated as the location of the SR request, ZC sequences of 32 different root parameters may be divided into 8 groups, and each group of 4 ZC sequences performs transmission of the SR. At this time, specifically, 32 ZC sequences with different root parameters may be grouped according to the following table:
in addition, specifically, in this step, a ZC sequence group used by the cell when transmitting the SR signal may be acquired, so that the cell can transmit the SR based on the ZC sequence group.
Step 102: an SR signal is transmitted based on the ZC sequence group.
In this step, specifically, the cell transmits the SR signal based on the ZC sequence group, and the cell is distinguished by using a code division method, so that the scheduling period of the SR is reduced under the same coverage level.
Further, on the basis of the above-described embodiment, the present embodiment also needs to determine the transmission cycle of the SR signal before transmitting the SR signal based on the ZC sequence group.
The transmission period is the product of a user residence factor and the number of repeated transmission of the SR, the value of the user residence factor is 100 xN/(M/8), and N is a positive integer greater than or equal to 1.
Specifically, the unit of the user dwell factor is milliseconds. Further, when the number of repeated transmission is 1, the SR signal is transmitted one transmission cycle later when a silence frame is encountered.
In this way, by the value-taking mode of the user residence factor, the sending period of the SR is related to the number of ZC sequences included in the ZC sequence set, so that the number of ZC sequence groups used by the cell when sending the SR signal can be adjusted by adjusting the value of M, that is, the number of ZC sequences included in the ZC sequence set, thereby shortening the time of the scheduling request.
The specific effects of the above-described embodiments are explained here by specific examples.
For example, when the value of M is 32 and the value of N is 1, that is, when the user residence factor is 25ms, if the number of SR repetition transmissions is 8, that is, the transmission period of the SR signal is 200 ms. At this time, each cell can be allocated to a UpPTS timeslot for uplink SR transmission in every 8 radio frames (200ms), and users in the same cell perform transmission once in the SR transmission period, so that in this embodiment, one cell has an SR signal transmission opportunity every 200 ms. In contrast, in the conventional system, when the number of SR repetition transmissions is 8, 8s has one SR signal transmission opportunity, that is, compared with the conventional system, the SR scheduling period is shortened to 1/40.
In addition, for example, taking the number of SR repetition transmissions as 1 here, when the user dwell factor is 1S in the existing system, 35 users can reside in one subband; in this embodiment, when the value of M is 32, that is, when the ZC sequence set includes 32 ZC sequences with different root parameters, and the user dwell factor is 1s, 1240 users (31 users dwell in 25ms) can dwell in one subband, that is, the number of the users dwell is 35 times that of the existing system, so that under the same time and frequency resources, this embodiment can accommodate more users dwell compared with the existing system.
In addition, in the above embodiment, when transmitting an SR signal based on the ZC sequence group, discrete fourier transform may be performed on each ZC sequence in the ZC sequence group to obtain a frequency domain signal sequence of the ZC sequence; then zero padding is carried out in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value; then, performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain an SR basic transmission sequence; and finally, transmitting the SR signal through the SR basic transmission sequence.
Specifically, the present embodiment first needs to generate a ZC sequence according to a root parameter. Wherein the ZC sequence may be generated from the root parameter by the following formula:
wherein x isu(N) is a ZC sequence, NzcU is a root parameter for the length of the ZC sequence.
In addition, specifically, the frequency domain signal sequence of the ZC sequence may be obtained by performing discrete fourier transform on the ZC sequence by the following formula:
wherein x isu(k) Is a frequency domain signal sequence.
In addition, specifically, zero padding is performed in the frequency domain signal sequence of the ZC sequence by the following formula until the sequence length reaches a preset value:
middle zero padding to NSEQ point:
Specifically, the sequence after zero padding is subjected to inverse discrete fourier transform and cyclic shift by the following formula to obtain an SR basic transmission sequence:
Su(n)＝circshift(ifft(X(k))，NCP)/(Nzc/NSEQ。
in addition, specifically, the cyclic offset may be calculated to obtain the SR signal.
Thus, through the above process, the SR basic transmission sequence is obtained based on the ZC sequence group, and thus, the SR signal can be transmitted through the SR basic transmission sequence.
In addition, here, when transmitting the SR signal based on the ZC sequence group, the SR basic transmission sequence may be stored directly based on the ZC sequence group to transmit the SR signal.
In the scheduling request sending method of the multi-subband communication system provided in this embodiment, a ZC sequence set is corresponded based on an SR signal, the ZC sequence set includes M ZC sequences with different root parameters, and ZC sequences in the ZC sequence set are equally divided into 8 groups, and a ZC sequence group is allocated to each cell, so that when a cell sends an SR signal, the ZC sequence group used by the cell when sending the SR signal can be obtained first, and the SR signal is sent based on the ZC sequence group, thereby realizing that a cell can send an SR signal based on a group of ZC sequences, shortening user scheduling request time on the premise that the number of times of SR repeated sending is the same, and accommodating more resident users in the same time and frequency resources.
Furthermore, as shown in fig. 3, a block diagram of a scheduling request transmitting apparatus of a multi-subband communication system according to an embodiment of the present invention is shown, where the scheduling request transmitting apparatus includes:
an obtaining module 301, configured to obtain a ZC sequence group used when a cell sends a scheduling request SR signal, where the SR signal corresponds to a ZC sequence set, the ZC sequence set includes M ZC sequences with different root parameters, and ZC sequences in the ZC sequence set are equally divided into 8 groups, and each cell is allocated with one ZC sequence group, where M is an integer multiple of 8;
a sending module 302, configured to send the SR signal based on the ZC sequence group.
Optionally, the scheduling request sending apparatus further includes:
the determining module is used for determining the sending period of the SR signal; wherein,
the sending period is the product of the user residence factor and the SR repeated sending times, the value of the user residence factor is 100 multiplied by N/(M/8), and N is a positive integer greater than or equal to 1.
Optionally, M takes on values of 8, 16, 24 and 32.
Optionally, the sending module includes:
a first obtaining unit, configured to perform discrete fourier transform on each ZC sequence in the ZC sequence group to obtain a frequency domain signal sequence of the ZC sequence;
a zero padding unit, configured to pad zero in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value;
the second acquisition unit is used for performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain an SR basic transmission sequence;
and a transmitting unit, configured to transmit an SR signal through the SR basic transmission sequence.
In addition, it should be noted that, the transmission module may also store an SR basic transmission sequence based on the ZC sequence group directly, so as to transmit an SR signal.
In the scheduling request transmitting apparatus of the multi-subband communication system according to this embodiment, a ZC sequence set is corresponded based on an SR signal, the ZC sequence set includes M ZC sequences with different root parameters, and ZC sequences in the ZC sequence set are equally divided into 8 groups, and a group of ZC sequences is allocated to each cell, so that when a cell transmits an SR signal, a ZC sequence group used by the cell when the cell transmits the SR signal may be acquired by an acquisition module, and an SR signal is transmitted by a transmission module based on the ZC sequence group, which realizes that one cell may transmit an SR signal based on a group of ZC sequences, thereby realizing that on the premise that the number of repeated SR transmissions is the same, user scheduling request time is shortened, and more resident users may be accommodated in the same time and frequency resources.
In addition, as shown in fig. 4, an entity structure schematic diagram of the electronic device provided in the embodiment of the present invention is shown, where the electronic device may include: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. The processor 410 may invoke a computer program stored on the memory 430 and executable on the processor 410 to perform the methods provided by the various embodiments described above, including, for example: 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.
In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the method provided in the foregoing embodiments when executed by a processor, and the method includes: 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 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.
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 (10)
1. A scheduling request transmitting method of a multi-subband communication system, comprising:
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.
2. The method of claim 1, wherein prior to transmitting the SR signal based on the ZC sequence group, the method further comprises:
determining a transmission period of the SR signal; wherein,
the sending period is the product of the user residence factor and the SR repeated sending times, the value of the user residence factor is 100 multiplied by N/(M/8), and N is a positive integer greater than or equal to 1.
3. The method as claimed in claim 1 or 2, wherein M is 8, 16, 24, or 32.
4. The method of claim 1, wherein the transmitting the SR signal based on the ZC sequence group comprises:
performing discrete Fourier transform on each ZC sequence in the ZC sequence group to obtain a frequency domain signal sequence of the ZC sequence;
zero padding is carried out in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value;
performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain an SR basic transmission sequence;
and transmitting an SR signal through the SR basic transmission sequence.
5. A scheduling request transmission apparatus for a multi-subband communication system, comprising:
the system comprises an acquisition module, a scheduling module and a scheduling module, wherein the acquisition module is used for acquiring a ZC sequence group adopted by a cell when transmitting a Scheduling Request (SR) signal, 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, each cell is allocated with one ZC sequence group, and M is an integral multiple of 8;
and the sending module is used for sending the SR signal based on the ZC sequence group.
6. The apparatus of claim 5, wherein the apparatus further comprises:
the determining module is used for determining the sending period of the SR signal; wherein,
the sending period is the product of the user residence factor and the SR repeated sending times, the value of the user residence factor is 100 multiplied by N/(M/8), and N is a positive integer greater than or equal to 1.
7. The apparatus of claim 5 or 6, wherein M is 8, 16, 24, or 32.
8. The apparatus of claim 5, wherein the transmission module comprises:
a first obtaining unit, configured to perform discrete fourier transform on each ZC sequence in the ZC sequence group to obtain a frequency domain signal sequence of the ZC sequence;
a zero padding unit, configured to pad zero in the frequency domain signal sequence of the ZC sequence until the sequence length reaches a preset value;
the second acquisition unit is used for performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain an SR basic transmission sequence;
and a transmitting unit, configured to transmit an SR signal through the SR basic transmission sequence.
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 performs the steps of the method for scheduling request transmission in a multi-subband communication system as claimed in any one of claims 1 to 4.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the scheduling request transmitting method of the multi-subband communication system as claimed in any one of claims 1 to 4.
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| US20100099423A1 (en) * | 2006-10-02 | 2010-04-22 | Panasonic Corporation | Sequence allocation method in mobile communication system |
| CN101743709A (en) * | 2007-06-18 | 2010-06-16 | 松下电器产业株式会社 | Sequence allocating method, transmitting method and wireless mobile station device |
| CN102790972A (en) * | 2011-05-18 | 2012-11-21 | 普天信息技术研究院有限公司 | Method and device for generating aerial signal of resource request channel based on ZC sequence |
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| US20100099423A1 (en) * | 2006-10-02 | 2010-04-22 | Panasonic Corporation | Sequence allocation method in mobile communication system |
| WO2008106894A1 (en) * | 2007-03-07 | 2008-09-12 | Huawei Technologies Co., Ltd. | Sequence distributing, processing method and apparatus in communication system |
| CN101743709A (en) * | 2007-06-18 | 2010-06-16 | 松下电器产业株式会社 | Sequence allocating method, transmitting method and wireless mobile station device |
| CN102790972A (en) * | 2011-05-18 | 2012-11-21 | 普天信息技术研究院有限公司 | Method and device for generating aerial signal of resource request channel based on ZC sequence |
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