CN109274628B - Uplink service sending method and device in multi-sub-band system - Google Patents
Uplink service sending method and device in multi-sub-band system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
Abstract
The invention provides a method and a device for sending uplink service in a multi-subband system, wherein the method comprises the following steps: s1, acquiring an uplink synchronous signal; s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot time slot of the first sub-band or the second sub-band of the start of the non-resident sub-band of the multi-sub-band system; and S3, when the uplink service is triggered, sending the uplink synchronization signal. The invention adds the uplink synchronous signal on the physical channel position of the uplink pilot frequency time slot of the first sub-band or the second sub-band of the starting non-resident sub-band of the multi-sub-band system, so that the mobile user can not have uplink desynchronization and the stability of the uplink service is ensured.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for sending an uplink service in a multi-subband system.
Background
At present, a multi-sub-band communication system exists, authorized frequency points of the multi-sub-band communication system are discretely distributed on a frequency band of 223.525MHz-231.65MHz, and the bandwidth of each frequency point is 25 KHz. The authorized frequency points are divided into residence zone sub-bands, the rest frequency points are divided into working zone sub-bands, and the residence zone sub-bands can be further divided into synchronous sub-bands and service sub-bands. An uplink pilot time slot physical channel (UpPTS) location on each traffic subband is allocated as a location of an uplink Scheduling Request (SR), at which 8 preambles (preambles) are generated through cyclic shift.
In order to prevent interference of adjacent cells, in every 8 radio frames, each cell can be allocated to an UpPTS timeslot for uplink SR transmission, and each cell determines which of the 8 radio frames is the selected radio frame in a manner that the cell ID number modulo 8 corresponds to the frame number modulo 8. The SR channel structure of the current multi-subband communication system is shown in fig. 1, and each cell has 40 SR scheduling resources in an SR scheduling period SrCycle.
However, the SR channel in the prior art is only used as a scheduling request, and when a clock offset between a User Equipment (UE) and a base station or a movement of the UE occurs, there is a hidden danger of uplink desynchronization, which affects the stability of an uplink service.
Disclosure of Invention
The present invention provides a method and apparatus for transmitting uplink traffic in a multi-subband system, which overcome or at least partially solve the above problems.
According to an aspect of the present invention, an uplink service transmission method in a multi-subband system is provided, including:
s1, acquiring an uplink synchronous signal;
s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot time slot of the first sub-band or the second sub-band of the start of the non-resident sub-band of the multi-sub-band system;
and S3, when the uplink service is triggered, sending the uplink synchronization signal.
Wherein, step S1 includes:
s11, acquiring the uplink synchronization signal base sequence based on the preset root parameters;
and S12, determining the uplink synchronous signal based on the cyclic offset of the base sequence.
Wherein, step S11 includes:
generating a ZC sequence based on the preset root parameters;
performing discrete Fourier transform on the ZC sequence 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;
and performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain the uplink synchronous signal base sequence.
Wherein, step S2 includes:
s21, in the multi-subband system, acquiring 8 code resources generated by cyclic shift of the base sequence at the position of an uplink pilot timeslot physical channel in the first subband or the second subband starting from the non-camping subband;
s22, allocating 1 code resource among the 8 code resources to the uplink synchronization signal.
Wherein, step S3 includes:
and when an uplink service is triggered, periodically sending the uplink synchronous signal.
When the uplink service is a multi-subband service and the uplink service is a multi-subband service, selecting a corresponding authorized candidate resource position as a transmission subband in a non-residence area of the multi-subband system according to the candidate resource positions corresponding to the first subband and the second subband.
When the uplink service is a single subband service, selecting an authorized single subband as a transmission subband in a residence zone or a non-residence zone of the multi-subband system.
According to a second aspect of the present invention, an uplink service transmitting apparatus in a multi-subband system includes:
the acquisition module is used for acquiring an uplink synchronous signal;
an adding module, configured to add the uplink synchronization signal to a physical channel position of an uplink pilot timeslot of a first subband or a second subband starting from a non-parked subband in the multi-subband system;
and the sending module is used for sending the uplink synchronous signal when the uplink service is triggered.
According to a third aspect of the present invention, there is provided a computer program product comprising program codes for executing the uplink traffic transmitting method described above.
According to a fourth aspect of the invention, there is provided a non-transitory computer readable storage medium storing the computer program as described above.
The invention adds the uplink synchronous signal on the physical channel position of the uplink pilot frequency time slot of the first sub-band or the second sub-band of the starting non-resident sub-band of the multi-sub-band system, so that the mobile user can not have uplink desynchronization, and the uplink service is ensured to be more stable.
Drawings
FIG. 1 is a diagram of an SR channel structure of a multi-subband communication system in the prior art;
fig. 2 is a flowchart of a method for sending an uplink service in a multi-subband system according to an embodiment of the present invention;
fig. 3 is a diagram of a cell signal structure according to an embodiment of the present invention;
fig. 4 is a structural diagram of an uplink service transmitting apparatus in a multi-subband system according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 2 is a flowchart of a method for sending an uplink service in a multi-subband system according to an embodiment of the present invention, as shown in fig. 2, including:
s1, acquiring an uplink synchronous signal;
s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot time slot of the first sub-band or the second sub-band of the start of the non-resident sub-band of the multi-sub-band system;
and S3, when the uplink service is triggered, sending the uplink synchronization signal.
In S1, the uplink synchronization signal is an uplink synchronization resource configured in a channel of the multi-subband system, and it can be understood that an SR channel in the prior art is only used for a scheduling request and does not configure a corresponding uplink synchronization resource, so that uplink desynchronization may be caused along with a clock offset between the UE and the base station or movement of the UE.
The uplink out-of-step refers to a state of losing uplink synchronization in uplink transmission service, and the uplink synchronization generally refers to that uplink signals sent by users at different positions using the same time slot arrive at a base station receiving antenna at the same time in the same cell.
In S2, the multi-subband system is a communication system having multiple operating frequency bands according to the embodiment of the present invention, and it can be understood that, when the uplink synchronization signal transmission cycle of the multi-subband system arrives and there is a synchronization signal resource, the uplink synchronization signal is initiated at the uplink synchronization position of the transmission subband: if the single sub-band service of the terminal is in the residence zone and no synchronous signal resource exists, the single sub-band service can be scheduled to the non-residence sub-band, so as to ensure that the single sub-band terminal has the uplink synchronous signal.
In S2, uplink pilot time slot physical channels (UpPTS) are set on the first sub-band and the second sub-band, where the UpPTS is a time slot physical channel configured in the dedicated uplink service transmission process, it can be understood that a transmission sub-band is determined according to a candidate resource position of a search space where authorization is placed, the first candidate resource position corresponds to the first sub-band, the second candidate resource position corresponds to the second sub-band, and an uplink synchronization signal is added in the UpPTS position, so that synchronization resource configuration is achieved on the premise that scheduling resources are not affected, and the added uplink synchronization signal is compatible with a channel time slot structure of a current system and does not affect the current communication system.
It should be noted that, in order to ensure that each cell can be assigned to a UpPTS for uplink synchronization signal transmission, the cells are divided according to a code division or time division manner, and a structure diagram of a channel of the divided cells is shown in fig. 3.
In S3, according to the service type, periodically sending uplink synchronous signals, wherein the sending period is configurable; and triggering by an event, starting an uplink synchronous timer when a service exists, triggering the transmission of an uplink synchronous signal when the timer reaches a preset threshold value, wherein the base station must ensure that the mobile terminal is always in an uplink synchronous state before the timer is overtime, and the mobile terminal is prevented from entering an uplink out-of-step state.
The embodiment of the invention adds the uplink synchronous signal on the physical channel position of the uplink pilot frequency time slot of the first sub-band or the second sub-band which is started by the non-resident sub-band of the multi-sub-band system, so that the mobile user can not have uplink desynchronization, the uplink service is ensured to be more stable, and the added uplink synchronous signal can be compatible with the channel time slot structure of the current system and can not influence the current communication system.
On the basis of the above embodiment, step S1 includes:
s11, acquiring the uplink synchronization signal base sequence based on the preset root parameters;
and S12, determining the uplink synchronous signal based on the cyclic offset of the base sequence.
In S11, the preset root parameter is a value freely set up according to a sequence of the uplink synchronization signal acquired as needed in the embodiment of the present invention, and the embodiment of the present invention does not limit the value.
Wherein, step S11 specifically includes:
generating a ZC sequence based on the preset root parameters;
performing discrete Fourier transform on the ZC sequence 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;
and performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain the uplink synchronous signal base sequence.
Specifically, first, a ZC sequence is generated using a root parameter u:
wherein u is a self-set root parameter;
then, performing discrete Fourier transform on the ZC sequence 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:
X＝[Xu((Nzc-1)/2),…,Xu(Nzc-1),0,0,…,0,Xu(0),Xu(1),…Xu((Nzc-1)/2-1)]，
wherein N isSEQThe number of points is a preset value of the sequence length;
and finally, performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain the uplink synchronous signal base sequence:
su(n)＝circshift(ifft(X(k)),Ncp)/(NZC/NSEQ)。
on the basis of the above embodiment, step S2 includes:
s21, in the multi-subband system, acquiring 8 code resources generated by cyclic shift of the base sequence at the position of an uplink pilot timeslot physical channel in the first subband or the second subband starting from the non-camping subband;
s22, allocating 1 code resource among the 8 code resources to the uplink synchronization signal.
In S22, according to the 8 code resources generated by cyclic shift of the base sequence, 1 code resource is selected as the uplink synchronization signal.
It can be understood that the cyclic offset of the uplink synchronization signal is calculated as:
Su,v(n)＝Su((n-Cv)modNSEQ)),n＝0,...,NSEQ+Ncp-1，
wherein the content of the first and second substances,
wherein v is a cyclic shift index, and the value range of v is 0-7.
On the basis of the above embodiment, the multi-subband system is in a non-camping zone.
It is understood that the above-mentioned multi-subband system is an uplink synchronization signal configured to solve uplink desynchronization. Then there is no uplink synchronization signal resource in the sub-band of the dwell region, so only the multi-sub-band system in the non-dwell region needs to add the uplink synchronization signal at the physical channel position of the uplink pilot time slot of the starting first sub-band or the second sub-band.
On the basis of the above embodiment, step S3 includes:
when the uplink service is triggered, the uplink synchronization signal is periodically transmitted according to a preset transmission period, for example, the preset transmission period is 200ms, and the uplink synchronization signal is transmitted with the uplink service once every 200 ms. It should be noted that, the embodiment of the present invention does not limit a specific sending period.
On the basis of the above embodiment, when the uplink service is a multi-subband service, and when the uplink service is a multi-subband service, in a non-residential zone of the multi-subband system, according to candidate resource positions corresponding to the first subband and the second subband, a corresponding authorized candidate resource position is selected as a transmission subband. And when the uplink service is the single subband service, selecting an authorized single subband as a transmission subband in a resident zone or a non-resident zone of the multi-subband system.
The multi-subband system is a communication system with multiple operating frequency bands provided by the embodiment of the present invention, and it can be understood that, when an uplink synchronization signal transmission cycle of the multi-subband system arrives and there is a synchronization signal resource, an uplink synchronization signal is initiated at an uplink synchronization position of a transmission subband: if the single sub-band service of the terminal is in the residence zone and no synchronous signal resource exists, the single sub-band service can be scheduled to the non-residence sub-band, so as to ensure that the single sub-band terminal has the uplink synchronous signal.
Fig. 4 is a structural diagram of an uplink service transmitting apparatus in a multi-subband system according to an embodiment of the present invention, as shown in fig. 4, including: an acquisition module 1, an adding module 2 and a sending module 3, wherein,
the acquisition module 1 is used for acquiring an uplink synchronization signal;
the adding module 2 is configured to add the uplink synchronization signal to a physical channel position of an uplink pilot timeslot of a first subband or a second subband starting from a non-resident subband of the multi-subband system;
the sending module 3 is configured to send the uplink synchronization signal when the uplink service is triggered.
Specifically, the obtaining module 1 obtains the configured uplink synchronization signal, the adding module 2 adds the uplink synchronization signal at the uplink pilot frequency time slot physical channel position of the first sub-band or the second sub-band starting from the non-resident sub-band of the multi-sub-band system, and the sending module 3 sends the uplink synchronization signal when the uplink service is triggered and needs to be sent.
The embodiment of the invention adds the uplink synchronous signal acquired by the acquisition module on the physical channel position of the uplink pilot frequency time slot of the first sub-band or the second sub-band of the starting non-resident sub-band of the multi-sub-band system through the addition module, so that the mobile user can not have uplink desynchronization, and the service is ensured to be more stable.
The present embodiment provides an uplink service transmitting apparatus in a multi-subband system, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor calls the program instructions to perform the methods provided by the method embodiments, for example, including: s1, acquiring an uplink synchronous signal; s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot time slot of the first sub-band or the second sub-band of the start of the non-resident sub-band of the multi-sub-band system; and S3, when the uplink service is triggered, sending the uplink synchronization signal.
The present embodiment discloses a 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 method provided by the above-mentioned method embodiments, for example, comprising: s1, acquiring an uplink synchronous signal; s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot time slot of the first sub-band or the second sub-band of the start of the non-resident sub-band of the multi-sub-band system; and S3, when the uplink service is triggered, sending the uplink synchronization signal.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: s1, acquiring an uplink synchronous signal; s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot time slot of the first sub-band or the second sub-band of the start of the non-resident sub-band of the multi-sub-band system; and S3, when the uplink service is triggered, sending the uplink synchronization signal.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
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, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An uplink service transmission method in a multi-subband system is characterized by comprising the following steps:
s1, acquiring an uplink synchronous signal;
s2, adding the uplink synchronous signal on the physical channel position of the uplink pilot frequency time slot of the first sub-band or the second sub-band of the starting non-resident sub-band of the multi-sub-band system, selecting the corresponding authorized candidate resource position as the transmission sub-band according to the candidate resource position corresponding to the first sub-band or the second sub-band, and dividing the cell channel according to the code division or the time division;
and S3, when the uplink service is triggered, sending the uplink synchronization signal.
2. The method according to claim 1, wherein step S1 includes:
s11, acquiring the uplink synchronization signal base sequence based on the preset root parameters;
and S12, determining the uplink synchronous signal based on the cyclic offset of the base sequence.
3. The method according to claim 2, wherein step S11 includes:
generating a ZC sequence based on the preset root parameters;
performing discrete Fourier transform on the ZC sequence 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;
and performing inverse discrete Fourier transform and cyclic shift on the sequence subjected to zero padding to obtain the uplink synchronous signal base sequence.
4. The method according to claim 3, wherein step S2 includes:
s21, in the multi-subband system, acquiring 8 code resources generated by cyclic shift of the base sequence at the position of an uplink pilot timeslot physical channel in the first subband or the second subband starting from the non-camping subband;
s22, allocating 1 code resource among the 8 code resources to the uplink synchronization signal.
5. The method according to claim 1, wherein step S3 includes:
and when an uplink service is triggered, periodically sending the uplink synchronous signal.
6. The method of claim 1, wherein when the uplink service is a multi-subband service, in a non-camping zone of the multi-subband system, a corresponding authorized candidate resource location is selected as a transmission subband according to candidate resource locations corresponding to the first subband and the second subband.
7. The method of claim 1, wherein when the uplink traffic is single subband traffic, a single subband with a grant is selected as a transmission subband in a camping zone or a non-camping zone of the multi-subband system.
8. An uplink traffic transmitting apparatus in a multi-subband system, comprising:
the acquisition module is used for acquiring an uplink synchronous signal;
an adding module, configured to add the uplink synchronization signal to a physical channel position of an uplink pilot timeslot of a first subband or a second subband initiated by a non-resident subband of the multi-subband system, select a corresponding authorized candidate resource position as a transmission subband according to a candidate resource position corresponding to the first subband or the second subband, and divide a cell channel according to code division or time division;
and the sending module is used for sending the uplink synchronous signal when the uplink service is triggered.
9. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the transmission method according to any one of claims 1 to 7.
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