CN113572587B - Waveform switching method of uplink physical shared channel - Google Patents
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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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
- H04L5/0091—Signaling for the administration of the divided path
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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Abstract
The invention provides a waveform switching method of an uplink physical shared channel, which is characterized in that according to the waveform which can be selected by configuring a PUSCH, a waveform indication field is added to DCI signaling, and the maximum bit number and the value meaning of the field are defined, so that UE supporting the field flexibly selects the waveform to carry out PUSCH transmission through the DCI signaling, thereby reducing switching delay; the capability of the UE in the aspect of the PUSCH waveform switching time delay is defined and designed, so that the realization processing requirement of the UE in the waveform switching time delay is simplified and unified, the air interface energy consumption is reduced, and the method is compatible with the existing standard.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a waveform switching method of an uplink physical shared channel.
Background
In a New Radio (NR) system, waveforms of an uplink physical shared channel (Physical Uplink Shared Channel, PUSCH) support two waveforms of cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) and discrete fourier transform spread OFDM (DFT-S-OFDM). The CP-OFDM waveform has the advantages of supporting continuous and discontinuous resource allocation modes, having greater flexibility, supporting multi-layer transmission and high throughput, and has the defects of larger peak average and smaller coverage; the DFT-S-OFDM waveform has single carrier characteristics, has the advantages of lower peak-to-average ratio, improves the efficiency of the radio frequency power amplifier, and can realize more distant coverage, but has the disadvantages that the distributed Resource Block (RB) is required to be continuous, only single-layer transmission is supported, and the throughput is lower.
In the existing NR system, the switching of the PUSCH waveform between the CP-OFDM waveform and the DFT-S-OFDM waveform is supported through a radio resource control (Radio Resource Control, RRC) message, the switching mode has the defects that the effective time of waveform transformation is relatively long, meanwhile, complex information interaction between an RRC layer and a Medium/Media Access Control (MAC) layer is involved, the effective time of waveform switching is difficult to know accurately by the MAC, and the uncertainty can lead to the performance of an air interface to be reduced.
For example, the chinese patent application No. 201880044844.2 discloses a method of selecting a PUSCH waveform based on one of a Modulation and Coding Scheme (MCS), resource allocation and Transport Block Size (TBS), which expands the size of an MCS table in which corresponding waveforms are added, thereby determining a waveform according to the MCS, or determining a waveform according to the number and continuity of resource allocation, or determining a waveform according to whether the TBS is less than a threshold; the method has the defects that the MCS, the resource allocation or the transport block size of the two waveforms are limited, so that the flexibility of the two waveforms in MCS, resource allocation and transport block allocation is greatly reduced, and the method of switching the waveforms through RRC messages in the existing standard cannot be compatible.
Disclosure of Invention
The invention aims to provide a waveform switching method of an uplink physical shared channel, which aims at solving the problems that in the prior art, the switching time of a PUSCH waveform between a CP-OFDM waveform and a DFT-S-OFDM waveform is overlong and the waveform switching flexibility is insufficient and the existing standard cannot be compatible, by using RRC, and comprises the following steps:
step 1: configuring the number of waveforms which can be selected in the uplink through a Radio Resource Control (RRC), wherein the number of waveforms is recorded as N, and each waveform is respectively numbered as 0,1, … and N-1 according to the configuration sequence;
step 2: determining the bit number of a downlink control information DCI waveform selection field, wherein the downlink control information DCI is a signaling DCI0-0 or DCI0-X of a scheduling Physical Uplink Shared Channel (PUSCH) scrambled by a C-RNTI, a CS-RNTI or a MCS-C-RNTI, and the DCI0-X comprises a DCI0-1 and a DCI0-2 downlink control information format; fields for waveform selection are newly added for signaling DCI0-0 and DCI 0-X: after DCI format identifiers (Identifier for DCI formats) of DCI0-0 and DCI0-X, a waveform indication (Waveform indicator) field is added, and the maximum number of bits corresponding to the waveform indication field is represented by the following formula (1):
in the above-mentioned (1),representing the rounding operation, N is the number of waveforms which are available for RRC configuration, and the value of the waveform indication field is set to be N, < ->Indicating that RRC configures the n+1th waveform transmission for PUSCH;
step 3: determining waveform switching delay according to the UE capability of the user equipment, and defining the waveform switching delay as the following formula (2):
in the formula (2), the unit is slot, wherein k is a non-negative integer, and the value of k is related to the UE capability;represents slots contained in μ -defined SCS subframes;
step 4: configuring a PUSCH waveform according to DCI signaling;
step 5: and transmitting the PUSCH according to the determined waveform switching time delay, and transmitting the PUSCH by the UE according to the determined waveform switching time delay based on the selected waveform according to the scheduling information of the base station.
Further, in step 1, the PUSCH alternative waveforms include a CP-OFDM waveform and a DFT-S-OFDM waveform, and when the PUSCH configures the CP-OFDM waveform and the DFT-S-OFDM waveform simultaneously, the number 0 indicates that the first configured waveform is the CP-OFDM waveform, and the number 1 indicates that the second configured waveform is the DFT-S-OFDM waveform.
Further, in step 2, when the RRC configures the CP-OFDM waveform and DFT-S-OFDM waveform for the PUSCH, the number of waveforms to be selected is n=2, and the maximum number of bits corresponding to the waveform indication field is 1bit; at this time, the value n of the waveform indication field is [0,1], and when n=0, the waveform representing that the RRC is the PUSCH configuration is the CP-OFDM waveform; when n=1, the waveform representing the RRC PUSCH configuration is the DFT-S-OFDM waveform.
Further, in step 2, when the RRC is the PUSCH configured waveform and the CP-OFDM waveform or DFT-S-OFDM waveform, the number of alternative waveforms n=1, and the maximum number of bits corresponding to the waveform indication field is 0, the waveform indication field is null, that is, the field is not present, and the PUSCH waveform is the waveform uniquely configured by the RRC.
Further, when the RRC configures a plurality of alternative waveforms of the PUSCH, after receiving DCI0-0 or DCI0-X, the terminal configures the waveform of the PUSCH according to the value of the waveform indication field after the DCI format identifier, where the maximum number of bits of the waveform indication field isWhen the value of the waveform indication field is n, the RRC configures the n+1th waveform transmission for PUSCH.
Further, when the RRC configures the PUSCH waveform into the CP-OFDM waveform and the DFT-S-OFDM waveform, the terminal receives DCI0-0 or DCI 0-X; when the value of the waveform indication field is 0, the RRC configures the CP-OFDM waveform for the PUSCH to send the subsequent PUSCH; when the value of the waveform indication field is 1, the RRC configures the DFT-S-OFDM waveform for the PUSCH to send the subsequent PUSCH.
Further, when the RRC configures 1 alternative waveform for PUSCH to transmit PUSCH, after the terminal receives DCI0-0 or DCI0-X, the waveform indication field is 0bit, and the RRC configures a uniquely selected waveform for PUSCH to transmit PUSCH; when the uniquely selected waveform is a CP-OFDM waveform, the RRC configures the CP-OFDM waveform for the PUSCH to transmit the PUSCH; when the uniquely selected waveform is a DFT-S-OFDM waveform, the RRC configures the DFT-S-OFDM waveform for the PUSCH to transmit the PUSCH.
Compared with the prior art, the waveform switching method has the following advantageous technical effects:
1. according to the waveform switching method, one or more alternative waveforms of the PUSCH are configured, the waveform indication field is added in the DCI0-0 and the DCI0-X, the meaning of the maximum bit number and the value corresponding to the field is defined, so that the UE supporting the field can flexibly select the waveform of the PUSCH through the DCI, and the switching time delay is greatly reduced.
2. The waveform switching method defines and designs the capability of the UE in the aspect of the PUSCH waveform switching time delay, simplifies and unifies the realization processing requirement of the UE in the waveform switching time delay, enables the base station side to flexibly switch the PUSCH waveform according to the capability of the UE, solves the problem of air interface performance reduction caused by overlong waveform switching time delay in the prior art, and simultaneously solves the problems of insufficient waveform switching flexibility and incapability of being compatible with the prior standard in the prior art.
3. For the UE which does not support the increased waveform indication field, the increased waveform indication field does not influence the analysis of DCI0-0 and DCI0-X containing the waveform indication field by the UE according to the existing capability, so that the compatibility of the waveform switching method is ensured.
Drawings
Fig. 1 is a flowchart of a waveform switching method according to an embodiment of the invention.
Detailed Description
The following describes in detail the embodiments of the waveform switching method according to the present invention with reference to the drawings.
Examples
As shown in fig. 1, the waveform switching method includes the steps of:
s101: the radio resource control RRC configures the number of waveforms available for uplink selection;
the method comprises the steps that the number of optional waveforms of a Physical Uplink Shared Channel (PUSCH) configured by RRC is recorded as N, each waveform is numbered as 0,1, … and N-1 according to a configuration sequence, the optional waveforms of the PUSCH comprise a CP-OFDM waveform and/or a DFT-S-OFDM waveform, when the PUSCH is simultaneously configured with the CP-OFDM waveform and the DFT-S-OFDM waveform, the number 0 indicates that the waveform configured by the first configuration is the CP-OFDM waveform, and the number 1 indicates that the waveform configured by the second configuration is the DFT-S-OFDM waveform;
s102: determining the bit number of a waveform selection field in downlink control information DCI;
the DCI is a signaling DCI0-0 or DCI0-X of a scheduling PUSCH scrambled by a C-RNTI, a CS-RNTI or a MCS-C-RNTI, wherein the DCI0-X comprises a DCI0-1 and a DCI0-2 downlink control information format;
fields for waveform selection are newly added for signaling DCI0-0 and DCI 0-X: after the first field of DCI0-0 and DCI0-X, i.e. the DCI format identifier, a waveform indication field is newly added, where the maximum number of bits corresponding to the waveform indication field is:
wherein,representing the rounding operation, N is the number of waveforms that the RRC configuration in step 1 can choose from; setting the value of the waveform indication field to n, < >>Then the RRC configures the n+1th waveform transmission for PUSCH;
the DCI0-0 format scrambled by the C-RNTI, the CS-RNTI or the MCS-C-RNTI takes a field name and a corresponding bit number as an expression mode, and a first field, a second field and a third field in the DCI0-0 format are respectively as follows:
DCI format identifier (Identifier for DCI formats) -1bit;
waveform indication
Frequency domain resource allocation (Frequency domain resource assignment) -2 bits;
a DCI0-X format scrambled by a C-RNTI, a CS-RNTI, an MCS-C-RNTI or a semi-static channel state indication radio network temporary identifier (SP-CSI-RNTI) takes a field name and a corresponding bit number as an expression mode, and a first field, a second field and a third field in the DCI0-X format are respectively as follows:
DCI format identifier (Identifier for DCI formats) -1bit;
waveform indication
Carrier indication (Carrier indicator) -3 bits;
s103: determining waveform switching time delay according to UE capability;
s104: configuring a PUSCH waveform according to DCI signaling;
s105: transmitting the PUSCH according to the determined waveform switching time delay;
the UE transmits PUSCH according to the scheduling information of the base station based on the selected waveform in accordance with a determined waveform switching delay, which depends on the UE capability.
In step S102 of the above embodiment, when the RRC is the PUSCH configuration waveform and the CP-OFDM waveform and the DFT-S-OFDM waveform, the number of waveforms to be selected is n=2, and the maximum number of bits corresponding to the waveform indication field is 1bit; at this time, the value n of the waveform indication field is [0,1], and when n=0, the waveform representing that the RRC is the PUSCH configuration is the CP-OFDM waveform; when n=1, the waveform representing the RRC configuration for PUSCH is a DFT-S-OFDM waveform;
when the RRC configures the PUSCH as the CP-OFDM waveform or the DFT-S-OFDM waveform, the number of waveforms to be selected n=1, and the maximum number of bits corresponding to the waveform indication field is 0, the waveform indication field is null, that is, indicates that the field does not exist, and indicates that the PUSCH waveform is the waveform uniquely configured by the RRC.
In step S103 of the above embodiment, two methods are used to determine the waveform switching delay according to the UE capability:
first, defining PUSCH waveform switching delay as when DCI signaling of RRC configuration waveform is received from UE to completion of waveform switching, defining SCS-related UE as type I and type II based on UE capability, as shown in table 1:
TABLE 1
In table 1, μ is SCS parameter in the prior art NR, A0 to A3 are integers, representing waveform switching delay of UE, and the value depends on UE capability; B0-B3 are integers, and represent that the waveform switching time delay of the UE takes the maximum value of the waveform switching time delay before the SCS parameter is changed and the waveform switching time delay after the SCS parameter is changed under the condition that the SCS parameter is changed, and the numerical value is related to the UE capability; the waveform switching time delay unit is expressed by a slot (slot) or an OFDM symbol (symbol);
according to the expression of NR system SCS: 2 μ ·15[kHz]As can be seen, specific values of PUSCH waveform switching delay are shown in table 2, and the unit is slot:
TABLE 2
Secondly, the waveform switching delay is defined as:
in the above formula, the unit is slot, wherein k is a non-negative integer, and the value of k is related to the UE capability;representing slots contained in μ -defined SCS subframes (SCS subframes), e.g., when k is 3, the waveform switching delay isSlots.
In step S104 of the above embodiment, when the RRC configures a plurality of alternative waveforms of the PUSCH, after receiving DCI0-0 or DCI0-X, the terminal configures the waveform of the PUSCH according to the value of the waveform indication field after the DCI format identifier, where the maximum number of bits of the waveform indication field isWhen the value of the waveform indication field is n, the RRC configures the n+1th waveform for the PUSCH to send;
when RRC is the PUSCH configuration waveform is the CP-OFDM waveform and the DFT-S-OFDM waveform, after receiving DCI0-0 or DCI0-X, if the value of the waveform indication field is 0, RRC is the PUSCH configuration CP-OFDM waveform to send the following PUSCH; if the value of the waveform indication field is 1, the RRC configures the DFT-S-OFDM waveform for the PUSCH and sends the subsequent PUSCH;
when RRC configures 1 alternative waveform for PUSCH to send PUSCH, after terminal receives DCI0-0 or DCI0-X, the waveform indication field is 0bit, that is, there is no field, RRC configures uniquely selected waveform for PUSCH to send PUSCH, when uniquely selected waveform is CP-OFDM waveform, RRC configures CP-OFDM waveform for PUSCH to send PUSCH; when the uniquely selected waveform is a DFT-S-OFDM waveform, the RRC configures the DFT-S-OFDM waveform for the PUSCH to transmit the PUSCH.
The present invention is not limited to the above-described embodiments, and any modifications, improvements, substitutions, and the like, which can be conceived by those skilled in the art, fall within the scope of the present invention without departing from the spirit of the invention.
Claims (6)
1. The waveform switching method of the uplink physical shared channel is characterized by comprising the following steps:
step 1: configuring the number of waveforms which can be selected by an uplink through a Radio Resource Control (RRC), wherein the number of waveforms is recorded as N, each waveform is respectively numbered as 0,1, … and N-1 according to a configuration sequence, the waveforms which can be selected by a PUSCH comprise a CP-OFDM waveform and a DFT-S-OFDM waveform, when the PUSCH is simultaneously configured with the CP-OFDM waveform and the DFT-S-OFDM waveform, the number 0 represents that the waveform of the first configuration is the CP-OFDM waveform, and the number 1 represents that the waveform of the second configuration is the DFT-S-OFDM waveform;
step 2: determining the bit number of a downlink control information DCI waveform selection field, wherein the downlink control information DCI is a signaling DCI0-0 or DCI0-X of a scheduling Physical Uplink Shared Channel (PUSCH) scrambled by a C-RNTI, a CS-RNTI or a MCS-C-RNTI, and the DCI0-X comprises a DCI0-1 and a DCI0-2 downlink control information format; fields for waveform selection are newly added for signaling DCI0-0 and DCI 0-X: the waveform indication field is added after the first field of DCI0-0 and DCI0-X, namely the DCI format identifier, and the maximum bit number corresponding to the waveform indication field is expressed as the following formula (1):
in the above-mentioned (1),representing the rounding operation, N is the number of waveforms which are available for RRC configuration, and the value of the waveform indication field is set to be N, < ->Indicating that RRC configures the n+1th waveform transmission for PUSCH;
step 3: determining waveform switching delay according to the UE capability of the user equipment, wherein the waveform switching delay is defined as the following formula (2):
in the formula (2), the unit is slot, wherein k is a non-negative integer, and the value of k is related to the UE capability;represents slots contained in μ -defined SCS subframes;
step 4: configuring a PUSCH waveform according to DCI signaling;
step 5: and transmitting the PUSCH according to the determined waveform switching time delay, and transmitting the PUSCH by the UE according to the determined waveform switching time delay based on the selected waveform according to the scheduling information of the base station.
2. The method for switching waveforms of uplink physical shared channel according to claim 1, wherein in step 2, when the RRC configures the waveforms for PUSCH as CP-OFDM waveform and DFT-S-OFDM waveform, the number of waveforms to be selected is n=2, and the maximum number of bits corresponding to the waveform indication field is 1bit; at this time, the value n of the waveform indication field is [0,1], and when n=0, the waveform representing that the RRC is the PUSCH configuration is the CP-OFDM waveform; when n=1, the waveform representing the RRC PUSCH configuration is the DFT-S-OFDM waveform.
3. The method for switching waveforms of uplink physical shared channels according to claim 1, wherein in step 2, when the RRC is a PUSCH configured waveform that is a CP-OFDM waveform or a DFT-S-OFDM waveform, the number of waveforms that can be selected is n=1, and the maximum number of bits corresponding to the waveform indication field is 0, the waveform indication field is null, that is, the waveform indication field does not exist, and at the same time, the PUSCH waveform is a waveform that is uniquely configured by the RRC.
4. The method for switching waveforms of uplink physical shared channel as claimed in claim 1, wherein when RRC configures a plurality of alternative waveforms of PUSCH, after receiving DCI0-0 or DCI0-X, the terminal configures the waveform of PUSCH according to the value of the waveform indication field after the DCI format identifier, where the maximum number of bits of the waveform indication field isWhen the value of the waveform indication field is n, the RRC configures the n+1th waveform transmission for PUSCH.
5. The method for switching waveforms of uplink physical shared channels according to claim 1, wherein when RRC configures a CP-OFDM waveform and a DFT-S-OFDM waveform for PUSCH, after receiving DCI0-0 or DCI0-X, when the value of the waveform indication field is 0, RRC configures the CP-OFDM waveform for PUSCH and transmits the subsequent PUSCH; when the value of the waveform indication field is 1, the RRC configures the DFT-S-OFDM waveform for the PUSCH to send the subsequent PUSCH.
6. The method for switching waveforms of uplink physical shared channels according to claim 1, wherein when RRC configures 1 alternative waveform for PUSCH to transmit PUSCH, after terminal receives DCI0-0 or DCI0-X, the waveform indication field is 0bit, RRC configures the selected waveform for PUSCH to transmit PUSCH, and when the selected waveform is CP-OFDM, RRC configures CP-OFDM waveform for PUSCH to transmit PUSCH; when the selected waveform is a DFT-S-OFDM waveform, the RRC configures the DFT-S-OFDM waveform for the PUSCH to transmit the PUSCH.
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| WO2024065539A1 (en) * | 2022-09-29 | 2024-04-04 | 北京小米移动软件有限公司 | Uplink waveform configuration method and apparatus, device, and storage medium |
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