CN110650535B - Method and device for multiplexing and sending uplink signals of unlicensed frequency band - Google Patents
Method and device for multiplexing and sending uplink signals of unlicensed frequency band Download PDFInfo
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- CN110650535B CN110650535B CN201810665880.2A CN201810665880A CN110650535B CN 110650535 B CN110650535 B CN 110650535B CN 201810665880 A CN201810665880 A CN 201810665880A CN 110650535 B CN110650535 B CN 110650535B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Abstract
The application provides a method and a device for multiplexing and sending an uplink signal of an unlicensed frequency band, wherein the method comprises the following steps: if the current time slot needs to send K pieces of PUCCH information, combining the K pieces of PUCCH information into one piece of PUCCH information; if the current time slot needs to send N pieces of PUSCH information, combining the N pieces of PUSCH information into one piece of PUSCH information; calculating available physical resources of the current time slot, and respectively allocating the physical resources to the merged PUCCH information and PUSCH information; and transmitting the PUCCH information by using the physical resource allocated to the PUCCH information according to a preset rule, and transmitting the PUSCH information by using the physical resource allocated to the PUSCH information. The method can enhance the system efficiency and robustness of NR when deployed in an unauthorized frequency band.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for multiplexing and transmitting an unlicensed band uplink signal.
Background
5G has become the latest generation technology of mobile communication, and various extended applications based on 5G will be developed rapidly.
An important application of 5G is the use of unlicensed frequency bands. For unlicensed bands, coexistence usage of various wireless systems needs to be considered relative to licensed bands.
Typical applications in unlicensed frequency bands are Wifi, LAA technology based on LTE, and the like. In order to enable the harmonious coexistence of multiple technologies, regulatory bodies of various countries use a forced Listen Before Talk (LBT) technique for the use of unlicensed frequency bands, i.e., data transmission is enabled only when it is sensed that the current channel is not occupied.
A problem with this mechanism is that some data cannot be guaranteed to be sent at a certain location. Since the transmittable position cannot be determined, a plurality of uplink data which need to be fed back may need to be transmitted at the same time.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating that a plurality of uplink data needing to be fed back need to be sent at the same time. In fig. 1, the Slot1 feedback may be fed back in three slots, slot N +1 and Slot N +2, and the Slot2 feedback may be fed back in two slots, slot N +1 and Slot N + 2. When the Slot N cannot perform data feedback due to LBT, the data of Slot1 and Slot2 need to be fed back at Slot N +1 or Slot N + 2. The prior art does not provide a process for determining how to combine or multiplex the two slot data.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for multiplexing and sending an uplink signal in an unlicensed frequency band, which can enhance system efficiency and robustness of NR in deployment of the unlicensed frequency band.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
an unlicensed frequency band uplink signal multiplexing transmission method includes:
if the current time slot needs to send K pieces of PUCCH information, combining the K pieces of PUCCH information into one piece of PUCCH information;
if the current time slot needs to send N pieces of PUSCH information, combining the N pieces of PUSCH information into one piece of PUSCH information;
calculating available physical resources of the current time slot, and respectively allocating the physical resources to the merged PUCCH information and PUSCH information;
and transmitting the PUCCH information by using the physical resource allocated to the PUCCH information according to a preset rule, and transmitting the PUSCH information by using the physical resource allocated to the PUSCH information.
An unlicensed band uplink signal multiplexing transmission apparatus, the apparatus comprising: a PUCCH merging unit, a PUSCH merging unit, a calculation distribution unit and an information sending unit;
the PUCCH merging unit is used for merging the K PUCCH information into one PUCCH information if the current time slot is determined to need to send the K PUCCH information;
the PUSCH merging unit is used for merging the N pieces of PUSCH information into one PUSCH information if the fact that the current time slot needs to send the N pieces of PUSCH information is determined;
the calculation allocation unit is configured to calculate a physical resource available for a current timeslot, and allocate the physical resource to the PUCCH information combined by the PUCCH combining unit and the PUSCH information combined by the PUSCH combining unit, respectively;
and the information sending unit is used for sending the PUCCH information by using the physical resources allocated to the PUCCH information by the calculation allocation unit according to a preset rule, and sending the PUSCH information by using the physical resources allocated to the PUSCH information.
According to the technical scheme, the PUCCH information and the PUSCH information of the current time slot are respectively merged, and the physical resources are distributed, so that the multiplexing transmission of the PUCCH/PUSCH in the unauthorized frequency band is realized. The scheme supports the joint transmission of a plurality of PUCCHs/PUSCHs while reducing the downlink control channel overhead as much as possible, thereby enhancing the system efficiency and robustness of NR when the NR is deployed in an unauthorized frequency band.
Drawings
Fig. 1 is a schematic diagram illustrating that a plurality of uplink data needing to be fed back need to be sent at the same time;
fig. 2 is a schematic diagram of a multiplexing transmission flow of an uplink signal in an unlicensed frequency band in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides a method for multiplexing and transmitting an Uplink signal in an unlicensed frequency band, which is implemented by respectively merging Physical Uplink Control CHannel (PUCCH) information and Physical Uplink Shared CHannel (PUSCH) information of a current time slot, and allocating Physical resources to realize multiplexing and transmitting of a PUCCH/PUSCH in the unlicensed frequency band. The scheme supports the joint transmission of a plurality of PUCCHs/PUSCHs while reducing the downlink control channel overhead as much as possible, thereby enhancing the system efficiency and robustness of NR when the NR is deployed in an unauthorized frequency band.
The unlicensed frequency band uplink signal multiplexing transmission system comprises network equipment and at least one terminal equipment, wherein the network equipment transmits control information and data to the terminal equipment, and the terminal equipment receives the data according to the received control information.
After the terminal equipment receives the data, the terminal equipment feeds back whether the data correctly receives Acknowledgement (ACK)/Negative Acknowledgement (NACK) information or sends the data to the network equipment according to the control information sent by the network equipment and the data receiving condition of the terminal equipment.
Specifically, information such as ACK/NACK is carried by PUCCH, and data sent by terminal equipment is carried by PUSCH. In the unlicensed band, due to the limitation of the LBT mechanism, the PUSCH and PUCCH will occur in the same slot.
When the situation that the PUCCH and the PUSCH need to be transmitted in the same time slot occurs, the terminal equipment transmits the PUSCH and the PUCCH through multiplexing the PUCCH/PUSCH is provided in the embodiment of the application.
The following describes the multiplexing transmission process of the uplink signal in the unlicensed frequency band in detail with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a schematic diagram of a multiplexing transmission flow of an uplink signal in an unlicensed frequency band in the embodiment of the present application. The method comprises the following specific steps:
in step 201, if the terminal determines that K pieces of PUCCH information need to be sent in the current slot, the K pieces of PUCCH information are combined into one piece of PUCCH information.
K is an integer greater than 1.
For the merging of PUCCH information, the present application provides two implementation manners, which are specifically as follows:
firstly, the combination of PUCCH information comprises the combination of ACK/NACK information and the combination of CSI information;
aiming at the combination of the ACK/NACK information, when the ACK/NACK information which needs to be sent is all ACK information, the ACK/NACK information in the combined PUCCH information is the ACK information; otherwise, the ACK/NACK information in the combined PUCCH information is NACK information;
and aiming at the combination of the CSI information, selecting the CSI information with the longest bit number needing to be fed back as the CSI information in the combined PUCCH information.
Secondly, the combination of the PUCCH information comprises the combination of ACK/NACK information and the combination of CSI information;
aiming at the combination of the ACK/NACK information, all the ACK/NACK information needing to be sent is serially connected according to a time sequence to be used as the ACK/NACK information in the PUCCH information;
and aiming at the combination of the CSI information, selecting the CSI information with the longest bit number needing to be fed back as the CSI information in the combined PUCCH information.
N is an integer greater than 1.
In this step, merging the N pieces of PUSCH information into one piece of PUSCH information includes:
allocating a priority to each PUSCH message; the priority is based on the type of each PUSCH service and the distance between each PUSCH and the current transmission time slot.
Selecting the PUSCH information with the highest priority as the merged PUSCH information; traversing the residual PUSCH information according to the sequence of the priority from low to high;
if the currently traversed PUSCH information and the PUSCH corresponding to the combined PUSCH information do not coincide in the frequency domain position and the currently combined PUSCH contains the maximum number of currently transmittable PUSCH data blocks of which the data blocks do not meet the system requirements, taking the currently traversed PUSCH information as a part of the combined PUSCH; this is possible because the different data frequency domains are not physically coincident, since they are transmitted simultaneously at different frequencies at the same time.
And ending the traversal of the PUSCH until the last PUSCH information is traversed, or the merged PUSCH contains the maximum PUSCH data block number which can be currently sent and has the data block reaching the system requirement. And then continuously selecting the next scheduled PUSCH until all PUSCHs traverse.
The execution of step 201 and step 202 is not in sequence, and if a plurality of pieces of PUCCH information do not exist, the PUCCH information is not merged; if there are no plurality of pieces of PUSCH information, the PUSCH information combining process is not performed.
In step 203, the terminal calculates the physical resources available for the current slot and allocates the physical resources to the combined PUCCH information and PUSCH information, respectively.
If the merged PUCCH information exists, allocating available physical resources for the PUCCH information; otherwise, no available physical resource is allocated to the PUCCH information;
if the merged PUSCH information exists, distributing available physical resources for the PUSCH information; otherwise, no available physical resource is allocated to the PUSCH information;
in this step, the physical resources available for the current slot are calculated and respectively allocated to the merged PUCCH information and PUSCH information, including:
determining an initial symbol for starting to send data according to an LTB channel monitoring result, wherein the initial symbol is used as an initial sending symbol of the combined PUCCH information and PUSCH information;
sending the frequency domain position of the merged PUCCH information to a frequency domain position determined in one-time PUCCH scheduling closest to the current time slot in a plurality of PUCCHs scheduled by the current time slot;
determining time domain scheduling information of each PUSCH in the combined PUSCH information, and deleting the PUSCH information from the combined PUSCH information if the time domain length of any PUSCH information included in the combined PUSCH information is greater than 14-T;
after LBT, the time for sending information is the residual time domain, and if the time needed for sending data exceeds the residual time domain, the data can not be sent. And sending the frequency domain position of the combined PUSCH information, namely summing the frequency domain positions of all PUSCHs in the current combined PUSCH information.
In a specific implementation, the available resources required by the combined PUSCH information may also be tailored in combination with the available resources required by the combined PUSCH information.
And step 204, the terminal transmits the PUCCH information by using the physical resource allocated to the PUCCH information according to a preset rule, and transmits the PUSCH information by using the physical resource allocated to the PUSCH information.
In this step, the physical resource allocated to the merged PUCCH information is used to transmit PUCCH information according to a preset rule, and the physical resource allocated to the merged PUSCH information is used to transmit PUSCH information, which includes the following three implementation manners:
first, in this way, only the merged PUCCH information or PUSCH information is sent, which specifically includes:
when the combined PUCCH information exists, the PUCCH information is sent by using the physical resources distributed to the combined PUCCH information;
and when the combined PUCCH information does not exist or the combined PUCCH information is already transmitted, the physical resource allocated to the combined PUSCH information is used for transmitting the PUSCH information.
When the length of the input combined PUCCH information exceeds the number of information which can be carried by allocated physical resources, only ACK/NACK information is selected to be sent;
and if only the selective ACK/NACK information is sent and the length of the sent information still exceeds the number of the information carried by the allocated physical resources, carrying out further logical AND combination on the ACK/NACK information.
The second type, combining and sending the combined PUCCH information and PUSCH information, specifically:
and performing joint coding on the combined PUCCH information and PUSCH information, and transmitting the information by using physical resources allocated to the combined PUSCH information.
Thirdly, sending the merged PUCCH information and PUSCH information separately, specifically:
and when the physical resources allocated to the combined PUCCH information and the PUSCH information are overlapped, punching the overlapped part in the physical resources corresponding to the combined PUSCH information, and only transmitting the combined PUCCH resources.
And introducing a high-level indication signaling bit to indicate a specific mode of the PUCCH/PUSCH multiplexing information to transmit the combined PUCCH/PUSCH information. Each value of the signaling represents a transmission mode.
The technical scheme provided by the application is not only suitable for sending the PUCCH information and the PUSCH information together, but also suitable for the situation of sending only the PUCCH information and sending only the PUSCH information. When only PUCCH information is transmitted, the PUSCH relevant input is processed as null input; when only PUSCH information is transmitted, the PUCCH-related input is processed as null input.
By the technical scheme provided by the application, multiplexing transmission of PUCCH/PUSCH in an unauthorized frequency band can be realized, downlink control channel overhead is reduced as much as possible, and meanwhile, joint transmission of a plurality of PUCCH/PUSCH is supported, so that system efficiency and robustness of NR when the unauthorized frequency band is deployed are enhanced.
Based on the same inventive concept, the application also provides an unauthorized frequency band uplink signal multiplexing transmitting device. Referring to fig. 3, fig. 3 is a schematic structural diagram of an apparatus applied to the above technology in the embodiment of the present application. The device comprises: PUCCH merging section 301, PUSCH merging section 302, calculation assigning section 303, and information transmitting section 304;
a PUCCH merging unit 301, configured to merge K pieces of PUCCH information into one PUCCH information if it is determined that the current slot needs to send the K pieces of PUCCH information;
a PUSCH merging unit 302, configured to merge N pieces of PUSCH information into one piece of PUSCH information if it is determined that the current slot needs to send the N pieces of PUSCH information;
a calculation allocation unit 303, configured to calculate available physical resources of the current slot, and allocate the physical resources to the PUCCH information merged by the PUCCH merging unit 301 and the PUSCH information merged by the PUSCH merging unit 302, respectively;
an information transmitting unit 304, configured to transmit the PUCCH information using the physical resource allocated to the PUCCH information by the calculation allocating unit 303 according to a preset rule, and transmit the PUSCH information using the physical resource allocated to the PUSCH information.
The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or may be further divided into a plurality of sub-units.
In summary, the present application implements the multiplexing transmission of the PUCCH/PUSCH in the unlicensed frequency band by respectively combining the PUCCH information and the PUSCH information of the current slot and allocating physical resources. The scheme supports the joint transmission of a plurality of PUCCHs/PUSCHs while reducing the downlink control channel overhead as much as possible, thereby enhancing the system efficiency and robustness of NR when the NR is deployed in an unauthorized frequency band.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. An unlicensed frequency band uplink signal multiplexing transmission method is characterized by comprising the following steps:
if K pieces of Physical Uplink Control Channel (PUCCH) information need to be sent in the current time slot, the K pieces of PUCCH information are combined into one piece of PUCCH information;
if the current time slot needs to send N pieces of PUSCH information, combining the N pieces of PUSCH information of the physical uplink shared channel into one piece of PUSCH information;
calculating available physical resources of the current time slot, and respectively allocating the physical resources to the merged PUCCH information and PUSCH information;
transmitting PUCCH information by using the physical resources allocated to the PUCCH information according to a preset rule, and transmitting PUSCH information by using the physical resources allocated to the PUSCH information;
wherein, the calculating the physical resources available for the current time slot and respectively allocating the physical resources to the merged PUCCH information and PUSCH information includes:
determining an initial symbol for starting to send data according to an LTB channel monitoring result, wherein the initial symbol is used as an initial sending symbol of combined PUCCH information and PUSCH information;
sending the frequency domain position of the merged PUCCH information to a frequency domain position determined in one-time PUCCH scheduling closest to the current time slot in a plurality of PUCCHs scheduled by the current time slot;
determining time domain scheduling information of each PUSCH in the combined PUSCH information, and deleting the PUSCH information from the combined PUSCH information if the time domain length of any PUSCH information included in the combined PUSCH information is greater than 14-T;
and sending the frequency domain position of the combined PUSCH information to sum all the PUSCH frequency domain positions in the currently combined PUSCH information.
2. The method of claim 1, wherein the combining of PUCCH information comprises combining Acknowledgement (ACK)/Negative Acknowledgement (NACK) information and combining Channel State Information (CSI) information;
aiming at the combination of the ACK/NACK information, when the ACK/NACK information needing to be sent is all ACK information, the ACK/NACK information in the combined PUCCH information is the ACK information; otherwise, the ACK/NACK information in the combined PUCCH information is NACK information;
and aiming at the combination of the CSI information, selecting the CSI information with the longest bit number needing to be fed back as the CSI information in the combined PUCCH information.
3. The method of claim 1, wherein the combining of PUCCH information includes combining ACK/NACK information and combining CSI information;
aiming at the combination of the ACK/NACK information, all the ACK/NACK information which needs to be sent is serially connected according to the time sequence to be used as the ACK/NACK information in the PUCCH information;
and aiming at the combination of the CSI information, selecting the CSI information with the longest bit number needing to be fed back as the CSI information in the combined PUCCH information.
4. The method of claim 1, wherein the combining the N PUSCH information into one PUSCH information comprises:
allocating a priority to each PUSCH information; the priority is according to each PUSCH service type, the interval of each PUSCH from the current sending time slot;
selecting the PUSCH information with the highest priority as the combined PUSCH information; traversing the rest PUSCH information according to the sequence of the priority levels from low to high;
if the currently traversed PUSCH information and the PUSCH corresponding to the combined PUSCH information are not overlapped in the frequency domain position, and the currently combined PUSCH contains the maximum PUSCH data block number which can be currently sent and does not meet the system requirement, the currently traversed PUSCH information is used as a part of the combined PUSCH;
and ending the traversal of the PUSCH until the last PUSCH information is traversed, or the combined PUSCH contains the maximum PUSCH data block number which can be currently sent and has the data block which meets the system requirement, and then continuing to select the next scheduled PUSCH until all the PUSCHs are traversed.
5. The method according to claim 1, wherein the transmitting PUCCH information using physical resources allocated to the combined PUCCH information and PUSCH information using physical resources allocated to the combined PUSCH information according to a preset rule comprises:
when the combined PUCCH information exists, the PUCCH information is sent by using the physical resources distributed to the combined PUCCH information;
and when the combined PUCCH information does not exist or the combined PUCCH information is already transmitted, the physical resource allocated to the combined PUSCH information is used for transmitting the PUSCH information.
6. The method of claim 5, further comprising:
when the length of the input combined PUCCH information exceeds the information number which can be carried by the allocated physical resources, only ACK/NACK information is selected to be sent;
and if only the ACK/NACK information is selected to be transmitted, and the length of the transmitted information exceeds the number of information carried by the allocated physical resources, carrying out further logical AND combination on the ACK/NACK information.
7. The method according to claim 1, wherein the transmitting PUCCH information using physical resources allocated to the combined PUCCH information and PUSCH information using physical resources allocated to the combined PUSCH information according to a preset rule comprises:
and performing joint coding on the combined PUCCH information and PUSCH information, and transmitting by using physical resources allocated to the combined PUSCH information.
8. The method according to claim 1, wherein the transmitting PUCCH information using physical resources allocated to the combined PUCCH information and PUSCH information using physical resources allocated to the combined PUSCH information according to a preset rule comprises:
and when the physical resources allocated to the merged PUCCH information and PUSCH information are overlapped, punching the overlapped part in the physical resources corresponding to the merged PUSCH information, and only transmitting the merged PUCCH resources.
9. An apparatus for multiplexing uplink signals in an unlicensed frequency band, the apparatus comprising: a Physical Uplink Control Channel (PUCCH) merging unit, a Physical Uplink Shared Channel (PUSCH) merging unit, a calculation distribution unit and an information sending unit;
the PUCCH merging unit is used for merging the K PUCCH information into one PUCCH information if the current time slot is determined to need to send the K PUCCH information;
the PUSCH merging unit is used for merging N pieces of PUSCH information into one piece of PUSCH information if the fact that the current time slot needs to send the N pieces of PUSCH information is determined;
the calculation allocation unit is configured to calculate a physical resource available for a current timeslot, and allocate the physical resource to the PUCCH information combined by the PUCCH combining unit and the PUSCH information combined by the PUSCH combining unit, respectively;
the information sending unit is used for sending the PUCCH information by using the physical resources allocated to the PUCCH information by the calculation and allocation unit according to a preset rule, and sending the PUSCH information by using the physical resources allocated to the PUSCH information;
the calculating and allocating unit is specifically configured to calculate physical resources available for a current slot, and when the physical resources are allocated to the combined PUCCH information and PUSCH information respectively, determine an initial symbol for starting to send data according to an LTB channel monitoring result, where the initial symbol is used as an initial sending symbol of the combined PUCCH information and PUSCH information; sending the frequency domain position of the merged PUCCH information to a frequency domain position determined in one-time PUCCH scheduling closest to the current time slot in a plurality of PUCCHs scheduled by the current time slot; determining time domain scheduling information of each PUSCH in the combined PUSCH information, and deleting the PUSCH information from the combined PUSCH if the time domain length of any PUSCH information included in the combined PUSCH information is greater than 14-T; and sending the frequency domain position of the combined PUSCH information, namely summing the frequency domain positions of all PUSCHs in the current combined PUSCH information.
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