CN110519857B - Data sending structure indication method and equipment - Google Patents
Data sending structure indication method and equipment Download PDFInfo
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- CN110519857B CN110519857B CN201910760293.6A CN201910760293A CN110519857B CN 110519857 B CN110519857 B CN 110519857B CN 201910760293 A CN201910760293 A CN 201910760293A CN 110519857 B CN110519857 B CN 110519857B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 18
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- 239000000969 carrier Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 description 12
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- 238000004590 computer program Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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Abstract
The application discloses a data transmission structure indication method, wherein downlink control information comprises a time length indication and a position indication of a suspension time interval in an uplink data channel. The suspension period is a period in which power is reduced below a threshold in an uplink data channel. The application also comprises the terminal equipment and the network equipment applying the method. The invention provides a design of a COT structure for informing a terminal by a base station, which solves the problem of inconvenient uplink access when a plurality of terminals exist.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method for indicating a data transmission structure, and a network device and a terminal device using the same.
Background
As the 5G new air interface (NR) first edition standard is completed, 5G will gradually expand to different domains. One important direction is the use of unlicensed bands. Compared with the licensed frequency band, the unlicensed frequency band needs to consider coexistence between different systems, typically, a Wifi system, an LTE-based LAA system, and the like. In order to make various systems coexist harmoniously, regulatory bodies of various countries adopt a forced Listen Before Transmit (LBT) technology for the use of an unlicensed frequency band, that is, data transmission can be performed only when the current channel is sensed to be unoccupied. A problem with this mechanism is that some data cannot be guaranteed to be sent at a certain location.
In the unlicensed frequency band, the data transmission needs to meet the limit of continuous data transmission duration (COT) under the limit of the regulatory rule. I.e. one continuous data transmission is limited to a certain time, e.g. 5ms, beyond which the channel needs to be released and LBT performed again. Within one COT, the transmission direction of data may change. For example, downlink data is sent before a COT, and uplink data is sent after the downlink data. When the base station obtains the channel resources through LBT and starts downlink data transmission, the terminal needs to know the COT structure adopted by the base station to send data, so as to perform corresponding detection and uplink data sending preparation.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for indicating a data sending structure, and provides a design for informing a terminal COT structure by a base station, so that the problem of inconvenient uplink access when multiple terminals exist is solved.
The application provides a data transmission structure indication method, which comprises the following steps:
the downlink control information comprises a time length indication and a position indication of a suspension time interval in an uplink data channel;
the suspension period is a period in which power is reduced below a threshold in an uplink data channel.
Preferably, the duration indication is used for indicating a time length or for indicating a multiple of a symbol length.
Preferably, the duration is configured to N duration levels by higher layer signaling.
Preferably, the duration comprises M duration levels, one for each of the one or more subcarrier spacings.
Preferably, the downlink control information includes a bit position indication for characterizing 2A suspension periods, where a is a natural number. Further preferably, a is a higher layer signaling configuration value.
The method according to any one of the embodiments of the present application, preferably, the position indication is used to indicate a 1 st symbol of a position of the suspension period in each uplink timeslot.
Or, the position indication is used for indicating a plurality of symbols separated in an uplink time slot by the position of the pause period.
Or, the position indication is used to indicate that the position of the suspension period is in the first symbol of the first complete uplink slot in a plurality of consecutive uplink slots.
Or, the position indication is used to indicate that the position of the suspension period is in the first symbol of the last complete uplink slot in a plurality of consecutive uplink slots.
Or, the position indication is used for indicating that the position of the pause period is located in a plurality of carriers or frequency bands.
In the method according to any one of the embodiments of the present application, preferably, when a time length indication and a position indication of a suspension period in an uplink data channel of a downlink control signaling collide with a symbol indicated as downlink in the downlink control signaling, the symbol is used for downlink.
The embodiment of the present application further provides a network device, which is used in the method according to any embodiment of the present application, and specifically, the network device is configured to send downlink control information, where the downlink control information includes a duration indication and a position indication of a suspension period in an uplink data channel; the suspension period is a period in which power is reduced below a threshold in an uplink data channel.
The embodiment of the present application further provides a terminal device, which is used in the method according to any embodiment of the present application, and specifically, the terminal device is configured to receive downlink control information, where the downlink control information includes a duration indication and a position indication of a suspension period in an uplink data channel; the suspension period is a period in which power is reduced below a threshold in an uplink data channel.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the indication of the network equipment for sending the alignment information to the terminal equipment in the uplink can ensure that a plurality of terminal equipments do not carry out any signal transmission at specific positions, thereby reducing the mutual interference among the terminals at the positions. The terminal which needs to listen before transmit has the opportunity to access the channel and shares the channel with the terminal which needs to transmit information. By adjusting the distribution of the positions, the opportunity that a plurality of terminal devices access the channel can be effectively controlled, different terminal distribution and service conditions are adapted, and the efficiency of the whole NR system in the operation of the unauthorized frequency band is improved.
The downlink control information provided by the invention contains the duration indication and the position indication, and can more flexibly support the adjustment of the uplink alignment position relative to the static or semi-static uplink (suspension period) convention. By the method, different terminal distributions and service conditions can be flexibly matched and adapted, and the access opportunity and the operation complexity of the terminal are balanced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of an embodiment of the method of the present invention for a network device;
FIG. 2 is a flowchart of an embodiment of the method of the present invention applied to a terminal device;
fig. 3 is a schematic diagram of a position where a 1 st symbol of each uplink timeslot in the COT is blank;
fig. 4 is a schematic diagram of positions where the 1 st symbol and the 8 th symbol of each uplink timeslot in the COT are blank;
fig. 5 is a schematic diagram of the 1 st symbol position of the first uplink slot of consecutive uplink slots;
fig. 6 is a schematic diagram of the 1 st symbol position of the last uplink slot of consecutive uplink slots;
fig. 7 is a schematic diagram of a network device and a terminal device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. 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 application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an embodiment of the method of the present invention applied to a network device.
The embodiment of the application provides a method for feeding back uplink data HARQ, which is used for a mobile communication system and comprises the following steps:
It should be noted that, the network device receives the uplink data channel in a cycle during operation, and after the data structure information of the application is issued, the network device identifies the COT according to the duration indication and the position indication, and receives the uplink data.
The data structure information of the base station informing the terminal is designed as follows:
in step 102, the downlink control information includes a duration indication and a location indication of a suspension period in the uplink data channel; the suspension period is a period in which power is reduced below a threshold in an uplink data channel.
For example, the data structure information includes information for uplink transmission alignment, that is, position indication and duration indication information, and is mainly used for the network device to instruct the terminal device to leave a part of length (duration of the suspension period) at a plurality of specific positions of uplink data, and not to transmit uplink signals.
Preferably, the duration indication is used for indicating a time length or for indicating a multiple of a symbol length. The duration of the suspension period may be an absolute time length, such as 16 μ s, or an uplink symbol ratio, such as 1/4 uplink symbol length.
Preferably, the duration is configured to N duration levels by higher layer signaling. The time length of the suspension period is default appointed by the network equipment and the terminal equipment, and can also be configured by high-level signaling. For example, when the duration of the suspension period is less than a length s, such as 16 μ s, for a terminal that has been LBT successfully, LBT is not performed any more; when the duration of the suspension period is greater than or equal to s and less than a length t, for example, when t is 25 μ s, for a terminal which has been subjected to LBT successfully, LBT of level 2 is required; and when the duration of the termination period is greater than or equal to t, performing LBT of level 4 for the terminal with successful LBT.
Preferably, the duration comprises M duration levels, one for each of the one or more subcarrier spacings. The duration of the suspension period may be different for different subcarrier spacings. If 15kHz subcarrier intervals are adopted, the duration of the pause time interval is 16 mu s, 15kHz subcarrier intervals are adopted, the duration of the pause time interval is 8 mu s, 60kHz subcarrier intervals are adopted, and the duration of the pause time interval is 4 mu s; it is also possible to use 1 fixed value, e.g. 8 mus, uniformly for each subcarrier spacing.
Preferably. The downlink control information comprises a bit position indication for representing 2AA is a natural number. Further preferably, a is a higher layer signaling configuration value. The value may be a fixed value, or may be configured by a higher layer signaling, and when a is equal to 0, it indicates that the position indication information is not displayed in the downlink control information. The position indicated by the position indication information cannot be located in a symbol indicated as downlink in the downlink control information. If the indicated position is a downlink symbol indicated in the downlink control information, the position is not taken as the suspension period.
And when A is not 0, if the pause time interval indicated by the position indication information is different from the existing blank position configuration, the terminal follows the pause time interval indicated by the position indication information to carry out related uplink signal transmission.
As a preferred embodiment, the method according to any one of the embodiments of the present application, preferably, the position indication is used to indicate a 1 st symbol of a position of the suspension period in each uplink timeslot.
Or, the position indication is used for indicating a plurality of symbols separated in an uplink time slot by the position of the pause period.
Or, the position indication is used to indicate that the position of the suspension period is in the first symbol of the first complete uplink slot in a plurality of consecutive uplink slots.
Or, the position indication is used to indicate that the position of the suspension period is in the first symbol of the last complete uplink slot in a plurality of consecutive uplink slots.
Or, the position indication is used for indicating that the position of the pause period is located in a plurality of carriers or frequency bands. Preferably, the distribution of the suspension periods indicated by the position indication information may be applicable to a plurality of carriers or frequency bands indicated by downlink control information.
In the method according to any one of the embodiments of the present application, preferably, when a time length indication and a position indication of a suspension period in an uplink data channel of a downlink control signaling collide with a symbol indicated as downlink in the downlink control signaling, the symbol is used for downlink.
It should be noted that the downlink control information is carried by the PDCCH, and is one of DCI messages. Defining a data structure information, the downlink control information includes the data structure information, and the structure information further includes the information of the position indication and the information of the duration indication. The indication of the applicable bandwidth in the data structure information may be multiple carriers or different Listen Before Transmit (LBT) bandwidths.
Step 103, the network device performs channel coding, modulation, and other operations on the information prepared in step 102, forms a PDCCH (downlink physical control channel) containing downlink control information, and transmits the PDCCH. Downlink control information (or the data structure information) is transmitted, which contains position indication information and duration indication information for determining the suspension period, and these information are defined as step 102.
Fig. 2 is a flowchart of an embodiment of the method of the present invention applied to a terminal device.
it should be noted that the terminal device sends the uplink data channel in a cycle during operation, and after the data structure information of the application is issued, the terminal device sends the uplink data according to the duration indication and the position indication.
the terminal receives the PDCCH containing downlink control information (or the data structure information) sent by the network device, where the downlink control information (or the data structure information) includes location indication information and duration indication information for determining the suspension period, and these information are defined in step 102.
And generating a pause period in the uplink data channel according to the position indication information and the time length indication information, that is, stopping sending the data signal in the pause period, specifically, reducing the power of the pause period to be below a threshold value in the uplink data channel by means of turning off the signal power and stopping sending the information, so that a blank period is realized in the uplink time slot according to the time length of the pause period, and other terminal devices can conveniently access the system.
In the embodiment of FIGS. 1-2, preferably, each step is performed cyclically.
FIGS. 3 to 6 show examples of the distribution of the vacant positions.
Configuration mode 1: the 1 st symbol in the uplink slot indicated in the position indication information.
Configuration mode 2: a plurality of symbols in an uplink slot indicated in the position indication information.
Configuration mode 3: a first symbol of a first uplink slot of the plurality of consecutive uplink slots indicated in the position indication information.
Configuration mode 4: a first symbol of a last uplink slot of the plurality of consecutive uplink slots indicated in the position indication information.
The above configuration is some typical indication distribution. The available distribution may also be a subset of the above, or more configured.
It should be noted that the location distribution may be directly set by the duration indication and the location indication in the downlink control signaling, or may be activated by the duration indication and the location indication after being configured by the higher layer signaling.
In fig. 3 to 6, Uplink represents Uplink, Downlink represents Downlink, and horizontal bars represent the slot arrangement of Uplink data, where the position of the pause period is marked by an oval symbol. The concrete description is as follows:
fig. 3 is a schematic diagram of a position where a 1 st symbol of each uplink timeslot in the COT is blank.
Each of the COTs is indicated as the 1 st symbol in the uplink slot. The method can adapt to the condition that the network uplink service is moderate. All terminals can access in each uplink time slot of the network configuration.
Fig. 4 is a schematic diagram of positions where the 1 st symbol and the 8 th symbol of each uplink timeslot in the COT are blank.
Each of the COTs is indicated as a number of symbols in an uplink slot. As shown in fig. 4, at this time, by increasing the alignment position of the 8 th symbol, the terminal device may have 2 opportunities to perform LBT in one timeslot, which has better support for uplink delay and traffic with higher traffic volume. This situation may further increase the chance of uplink access relative to the configuration of fig. 3.
Fig. 5 is a schematic diagram of the 1 st symbol position of the first uplink slot of consecutive uplink slots.
A first symbol of a first uplink slot of a plurality of consecutive uplink slots in the COT. The configuration is suitable for the situation that the unlicensed frequency band is slightly interfered by other systems, and the uplink service transmission of the system can be ensured only by properly increasing the uplink access alignment position according to the configuration of the network equipment by the terminal equipment.
Fig. 6 is a schematic diagram of the 1 st symbol position of the last uplink slot of consecutive uplink slots.
The first symbol of the last uplink slot of a plurality of consecutive uplink slots in the COT. The configuration can be used for the network equipment to pay more attention to the feedback of the downlink data, and the feedback of the downlink data in the continuous uplink data needs to be ensured to be sent to the base station equipment as much as possible.
If the direct indication mode is adopted in the equipment standard, a plurality of angry states correspond to the A bit information indication.
If the standard is configured by higher layer, the possible blank distribution can be defined in the relevant protocol, and then the terminal device is informed of the available distribution of the suspension periods by higher layer signaling, such as RRC message. For example, after receiving the higher layer signaling, the terminal device interprets the location indication information indicated by the Uplink blank location indicator in the DCI format1_2 according to the information configured by the higher layer signaling.
Fig. 7 is a schematic diagram of a network device and a terminal device according to the present invention.
Consider a communication system comprised of network devices and terminal devices. One network device can simultaneously transmit and receive data to a plurality of terminal devices. The network device includes a network data unit and a network control unit. The terminal device includes a terminal data unit and a terminal control unit. The network data unit and the terminal data unit transmit data through a downlink data shared channel (PDSCH) and an uplink data shared channel (PUSCH). And the network control unit and the terminal control unit exchange control information through a downlink control channel (PDCCH) and an uplink control channel (PUCCH). The PDCCH transmits Downlink Control Information (DCI) and performs specific transmission format-related contents of the PDSCH, the PUSCH, and the PUCCH. The basic time transmission unit in the system is a symbol, and 14 symbols form a time slot. One symbol length is 1/(14 × 2 n) ms, where n takes values of 0, 1, 2, 3, 4, corresponding to carrier spacings of 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, respectively.
The embodiment of the present application further provides a network device, which is used in the method according to any embodiment of the present application, and specifically, the network device 20 includes a network data unit 21 and a network control unit 22, where the network control unit is configured to send downlink control information, and the downlink control information includes a duration indication and a position indication of a suspension period in an uplink data channel; the suspension period is a period in which power is reduced below a threshold in an uplink data channel. And the network data unit is used for identifying the COT according to the duration indication and the position indication and receiving uplink data.
The embodiment of the present application further provides a terminal device, which is used in the method according to any embodiment of the present application, and specifically, the terminal device 10 includes a terminal data unit 11 and a terminal control unit 12, where the terminal control unit is configured to receive downlink control information, and the downlink control information includes a duration indication and a position indication of a suspension period in an uplink data channel; the suspension period is a period in which power is reduced below a threshold in an uplink data channel. And the terminal data unit is used for sending uplink data according to the duration indication and the position indication.
In view of the above, the present application proposes a new downlink control information format, see DCI format1_2 in table 1, and other formats are shown in standard 38.212 table 7.3.1-1.
TABLE 1 DCI Format
| DCI format | Use of |
| 0_0 | Intra-cell PUSCH scheduling |
| 0_1 | Intra-cell PUSCH scheduling |
| 1_0 | Intra-cell PDSCH scheduling |
| 1_1 | Intra-cell PDSCH scheduling |
| 1_2 | COT indication |
| 2_0 | Terminal group slot format notification |
| 2_1 | Terminal group PRB(s) and OFDM symbol notification |
| 2_2 | TPC command transmission PUCCH and PUSCH |
| 2_3 | TPC command set transmission for SRSC transmission of one or more terminals |
The specific definition of the DCI Format1_2 is, for example:
DCI format1_2 is used for the COT indication.
Wherein the indication to the terminal may transmit the following DCI format1_2 information by means of CRC scrambled with C-RNTI:
COT Length indication-B bits
COT Format indication-C bit
Position indication-a bit
Carrier or LBT Bandwidth indication-D bits
In DCI format1_2, the standard value of the duration of the uplink data channel suspension period is 8 μ s.
For example, the position indication information is indicated by "Uplink blank location indicator", and the duration of the suspension period also needs to be separately specified in the standard, for example, the description is directly given in 38.212, as shown above. In the above example, a, B, C, D represent integers greater than or equal to 0, indicating the number of bits occupied by the corresponding indication. The meaning of the a bit is given by higher layer signaling or directly in the protocol. For the way of giving the meaning of a bit directly, it is possible to directly specify a as 1bit or 2 bit. 1bit represents 2 kinds of pause period (or referred to as "blank position") distribution modes, and 2bits represents 4 kinds of pause period distribution modes.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (11)
1. A method for indicating a data transmission structure, comprising:
the downlink control information comprises a time length indication and a position indication of a suspension time interval in an uplink data channel; the suspension time interval is used for the opportunity of uplink access of other terminal equipment;
the suspension time interval is a time interval when the power in an uplink data channel is reduced below a threshold value; a duration level of the pause period, including at least one of a duration of 4 μ s, 8 μ s, 16 μ s;
the duration indication is used for indicating the time length or the multiple of the symbol length;
the downlink control information comprises a bit position indication for representing 2AAnd A is a natural number configured by high-layer signaling.
2. The method of claim 1,
the duration is configured into N duration grades by high-level signaling.
3. The method of claim 1,
the duration comprises M duration levels, each for one or more subcarrier spacings, respectively.
4. The method according to any one of claims 1 to 3,
the position indication is used for indicating the 1 st symbol of the position of the pause period in each uplink time slot.
5. The method according to any one of claims 1 to 3,
the position indication is used for indicating a plurality of symbols separated in an uplink time slot at the position of the pause period.
6. The method according to any one of claims 1 to 3,
the position indication is used for indicating the position of the pause period in the first symbol of the first complete uplink time slot in a plurality of continuous uplink time slots.
7. The method according to any one of claims 1 to 3,
the position indication is used for indicating the position of the pause period in the first symbol of the last complete uplink time slot in a plurality of continuous uplink time slots.
8. The method according to any one of claims 1 to 3,
the position indication is used for indicating that the position of the pause period is located in a plurality of carriers or frequency bands.
9. The method according to any one of claims 1 to 3,
when the time length indication and the position indication of the suspension time interval in the uplink data channel of the downlink control signaling conflict with the symbol indicated as downlink in the downlink control signaling, the symbol is used for downlink.
10. A network device for implementing the method of any one of claims 1 to 9, comprising:
a network control unit, configured to send downlink control information, where the downlink control information includes a time indication and a position indication of a suspension period in an uplink data channel;
and the network data unit is used for receiving the uplink data according to the duration indication and the position indication.
11. A terminal device for implementing the method of any one of claims 1 to 9, comprising:
a terminal control unit, configured to receive downlink control information, where the downlink control information includes a time indication and a position indication of a suspension period in an uplink data channel;
and the terminal data unit is used for sending the uplink data according to the duration indication and the position indication.
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