CN110662293A - Uplink service scheduling method and system based on discrete sub-band - Google Patents
Uplink service scheduling method and system based on discrete sub-band Download PDFInfo
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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
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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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
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Abstract
The application provides a method and a system for scheduling uplink service based on discrete sub-bands, wherein the method comprises the following steps: the base station adds an indication frame field in the uplink scheduling DCI, and the indication frame field is used for indicating a wireless frame for sending uplink data; when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame; when the scheduled service is a service with a low time delay requirement, indicating a wireless frame for sending uplink data as a next wireless frame; when sending uplink scheduling DCI to a terminal, indicating a wireless frame for sending uplink data in the uplink scheduling DCI according to the time delay requirement of a service and indicating a subframe for sending the uplink data; and when the terminal receives the uplink scheduling DCI transmitted by the base station, transmitting the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated wireless frame for transmitting the uplink data. The method can meet the uplink time delay requirement of the high time delay service.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a system for scheduling uplink services based on discrete subbands.
Background
With the development of the smart power grid, the electricity consumption information acquisition system puts new and higher requirements on communication channels. At present, the 230MHz frequency band is mainly applied to a data transmission radio station to undertake remote data acquisition work, and the provided rate is very low, so that the data transmission radio station can only be used for some simple communication applications, and the increasing service requirements of a smart power grid and a sensor network cannot be met.
The TD-LTE230 power utilization information acquisition system is a wireless communication system which is based on a TD-LTE technology, combines advanced technologies such as spectrum sensing, carrier aggregation, interference demodulation and software radio, uses discrete spectrum resources in a 230MHz frequency band in the power industry, and is innovated, researched and developed and deeply customized. The method is deeply customized according to the communication requirements of the power service, optimizes a public network TD-LTE technical system, a communication protocol and a networking structure, and improves the capacity of the terminal and the real-time performance of the service.
The 223.025-235.000 MHz frequency band is used for telemetering, remote control, data transmission and other services, and consists of a plurality of scattered 25k channels, and adjacent frequencies are assigned to other industries for use, so that no wider continuous spectrum resource exists. The number of the electric power authorization frequency points is 40, and the electric power authorization frequency points are distributed in a discrete and unequal interval mode.
Referring to fig. 1, fig. 1 is a schematic diagram of a frame structure in the TD-LTE230 technology. In fig. 1, a radio frame is composed of 5 subframes with a length of 5ms, where subframe 0 is a downlink subframe, and subframes 2, 3, and 4 are uplink subframes; subframe 1 is a special subframe, and includes 3 fields, which are a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS), respectively.
The uplink and downlink transmission is indicated by the base station sending DCI to the UE. According to the difference of the UE capability, the UE can be divided into a single sub-band terminal and a multi-sub-band terminal. The single sub-band terminal and the multi-sub-band terminal both perform an attachment process in a single sub-band form, and after the attachment, the base station allocates one camping sub-band to each UE.
And when the UE does not have service transmission, the UE monitors the resident sub-band, and if DCI information scrambled by the C-RNTI of the UE is received, uplink or downlink transmission is carried out according to the indication of the base station. Before the base station carries out multi-subband scheduling for a multi-subband user, the base station firstly sends multi-subband starting DCI to the user, wherein the multi-subband starting DCI carries information such as a starting subband, the maximum number of occupied subbands of the DCI and the like. And the UE jumps to the corresponding sub-band blind detection PDCCH.
Referring to fig. 2, fig. 2 is a schematic diagram of uplink scheduling information and uplink data transmission in a conventional implementation. In fig. 2, taking 16 subbands as an example, the nth frame transmits uplink scheduling information, the (N + 1) th frame transmits uplink data corresponding to the uplink scheduling information transmitted on the nth frame, the (N + 1) th frame transmits uplink scheduling information, and the (N + 2) th frame transmits uplink data corresponding to the uplink scheduling information transmitted on the (N + 1) th frame. And so on.
The basic electric power business comprises distribution automation, power utilization information acquisition, distributed power supplies, accurate load control and the like. The latency requirements for these services vary widely, from milliseconds to minutes. The scheduling must meet the delay requirements of different services.
By using the prior art, when the base station performs uplink scheduling, the terminal starts uplink data transmission only when receiving the next radio frame of the DCI, which may cause a large time delay and may not satisfy the millisecond-level service time delay.
Referring to fig. 3, fig. 3 is a schematic diagram of a time delay of a terminal sending uplink data in the prior art. In fig. 3, it is assumed that the uplink data can be sent in one subframe, and the time delay from the terminal receiving the DCI to the terminal sending the uplink data is 35ms, that is, the terminal can wait until the subframe transmitting the uplink data in the next frame can send the data corresponding to the DCI.
Disclosure of Invention
In view of this, the present application provides a method and a system for scheduling an uplink service based on a discrete subband, which can meet the uplink delay requirement of a high-delay service.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a method for dispatching uplink service based on discrete sub-band includes:
the base station adds an indication frame field in uplink scheduling Downlink Control Information (DCI) for indicating a wireless frame for sending uplink data;
when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame;
when the scheduled service is a service with a low time delay requirement, indicating a wireless frame for sending uplink data as a next wireless frame;
when sending uplink scheduling DCI to a terminal, indicating a wireless frame for sending uplink data in the uplink scheduling DCI according to the time delay requirement of a service and indicating a subframe for sending the uplink data;
and when the terminal receives the uplink scheduling DCI transmitted by the base station, transmitting the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated wireless frame for transmitting the uplink data.
Wherein the method further comprises:
when N terminals are scheduled to transmit uplink data in a wireless frame, indicating a subframe of the corresponding terminal for transmitting the uplink data in uplink scheduling DCI respectively, wherein N is 2 or 3.
When the subframe for sending the uplink data is indicated, a Bitmap form is used for indicating:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
A discrete sub-band based uplink service scheduling system comprises: a base station and a terminal;
a base station, configured to add an indication frame field in downlink control information DCI for uplink scheduling, to indicate a radio frame for transmitting uplink data; when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame; when the scheduled service is a service with a low time delay requirement, indicating a wireless frame for sending uplink data as a next wireless frame; when sending uplink scheduling DCI to a terminal, indicating a wireless frame for sending uplink data in the uplink scheduling DCI according to the time delay requirement of a service and indicating a subframe for sending the uplink data;
and the terminal is used for transmitting the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated wireless frame for transmitting the uplink data when receiving the uplink scheduling DCI transmitted by the base station.
Wherein the content of the first and second substances,
the base station is further configured to respectively indicate, in the uplink scheduling DCI, a subframe in which the corresponding terminal transmits uplink data when N terminals are scheduled to transmit uplink data in one radio frame, where N is 2 or 3.
When the subframe for sending the uplink data is indicated, a Bitmap form is used for indicating:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
According to the technical scheme, when the base station performs uplink scheduling, the terminal transmits uplink data in the current wireless frame aiming at the service with high time delay requirement, so that the uplink time delay requirement of the service with high time delay can be met.
Drawings
FIG. 1 is a schematic diagram of a frame structure in the TD-LTE230 technology;
fig. 2 is a schematic diagram of uplink scheduling information and uplink data transmission in a conventional implementation;
fig. 3 is a schematic diagram of a time delay of a terminal sending uplink data in the prior art;
fig. 4 is a schematic diagram of an uplink service scheduling process based on discrete subbands in this embodiment;
fig. 5 is a schematic diagram of uplink scheduling information and uplink data transmission in an embodiment of the present application;
fig. 6 is a schematic diagram illustrating a time delay generated by a scheduling method provided in an embodiment of the present application;
fig. 7 is a schematic diagram illustrating uplink data scheduling of multiple terminals in the same radio frame according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a system applied to the above 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 an uplink service scheduling method based on discrete subbands, when a base station performs uplink scheduling, a terminal is enabled to transmit uplink data in a current wireless frame aiming at a service with a high time delay requirement, and the uplink time delay requirement of the high time delay service can be met.
The base station adds an indication frame field in the uplink scheduling DCI, and the indication frame field is used for indicating a wireless frame for sending uplink data;
when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame;
and when the scheduled service is the service with low time delay requirement, indicating the wireless frame for sending the uplink data as the next wireless frame.
Aiming at the division of the service with low delay requirement and the service with high delay requirement, the division can be realized according to the prior art, and the method is not limited during the specific implementation of the application.
The following describes an uplink service scheduling process based on discrete subbands in this embodiment in detail with reference to the accompanying drawings.
Referring to fig. 4, fig. 4 is a schematic diagram of an uplink traffic scheduling process based on a discrete subband in this embodiment. The method comprises the following specific steps:
step 401, when the base station sends the downlink control information DCI for uplink scheduling to the terminal, according to the delay requirement of the service, the base station indicates a radio frame for sending uplink data in the DCI for uplink scheduling and indicates a subframe for sending uplink data.
In the specific implementation of the application, aiming at the service with higher time delay requirement, the base station indicates to schedule uplink data on the current wireless frame, namely the uplink data and the uplink scheduling DCI are sent in the same wireless frame;
when the subframe for sending the uplink data is indicated, a Bitmap form is used for indicating:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
Referring to fig. 5, fig. 5 is a schematic diagram of uplink scheduling information and uplink data transmission in the embodiment of the present application. In fig. 5, taking 16 subbands as an example, the nth frame transmits the uplink scheduling DCI, and simultaneously transmits uplink data scheduled by the uplink scheduling DCI in the nth frame, the (N + 1) th frame transmits the uplink scheduling DCI, and simultaneously transmits uplink data scheduled by the uplink scheduling DCI in the (N + 1) th frame, and so on.
Step 402, when the terminal receives the uplink scheduling DCI transmitted by the base station, the terminal transmits the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated radio frame for transmitting the uplink data.
By adopting the scheduling method provided by the application, the time delay of data transmission can be reduced. Referring to fig. 6, fig. 6 is a schematic diagram illustrating a time delay generated by using the scheduling method provided in the embodiment of the present application.
Assuming that the uplink data can be completely transmitted in one subframe, after receiving the uplink scheduling DCI, the time delay to complete data transmission is 15ms, which is greatly improved compared with the previous time delay.
And in fig. 6, taking the scheduling of subframe 3 as an example, if subframe 2 is scheduled, the delay is only 10 ms.
The embodiment of the application also provides a scheme for scheduling a plurality of terminals in the same subframe; when a plurality of terminals are scheduled, the terminals can be scheduled in a wireless frame through molecular frame scheduling, and resources can be more effectively utilized. The concrete implementation is as follows:
when N terminals are scheduled to transmit uplink data in one wireless frame, indicating the subframe of the corresponding terminal for transmitting the uplink data in uplink scheduling DCI respectively, wherein N is 2 or 3.
When the subframe for sending the uplink data is indicated, the Bitmap form is also used for indicating:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating scheduling of uplink data of multiple terminals in the same radio frame in the embodiment of the present application. Fig. 7 is a schematic diagram of scheduling 2 terminals in a radio frame, where PDCCH1 is the uplink scheduling DCI of terminal 1, and schedules subframe 2 and subframe 3; PDCCH2 schedules DCI for the uplink of terminal 2, and schedules subframe 4.
In specific implementation, the method and the device for scheduling the downlink radio frame in the downlink scheduling DCI can be applied to scheduling the current radio frame by the uplink scheduling DCI in one radio frame, and can also be applied to scheduling the next radio frame in the existing implementation.
Referring to table 1, table 1 gives an indication of radio frames and subframes in the uplink scheduling DCI corresponding to fig. 6.
| Fields in DCI | Terminal 1(PDCCH1) | Terminal 2(PDCCH2) |
| Indication of current frame or next frame | Current frame | Current frame |
| Bitmap | ‘110’ | ‘001’ |
TABLE 1
The uplink DCI scheduling for terminal 1 is given in table 1 as the current frame and indicates that uplink data is transmitted on subframe 2 and subframe 3; the uplink DCI for terminal 2 is scheduled as the current frame and indicates that uplink data is transmitted on subframe 4.
In the embodiment of the present application, for example, processing for a high latency service, and for processing for a low latency service, a next frame may be scheduled according to an existing implementation, but a wireless frame for sending uplink data still needs to be indicated, instead of scheduling the next frame by default.
Based on the same inventive concept, the application also provides an uplink service scheduling system based on the discrete sub-band. Referring to fig. 8, fig. 8 is a schematic diagram of a system applied to the above technology in the embodiment of the present application. The system comprises: a base station and a terminal;
a base station, configured to add an indication frame field in downlink control information DCI for uplink scheduling, to indicate a radio frame for transmitting uplink data; when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame; when the scheduled service is a service with a low time delay requirement, indicating a wireless frame for sending uplink data as a next wireless frame; when sending uplink scheduling DCI to a terminal, indicating a wireless frame for sending uplink data in the uplink scheduling DCI according to the time delay requirement of a service and indicating a subframe for sending the uplink data;
and the terminal is used for transmitting the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated wireless frame for transmitting the uplink data when receiving the uplink scheduling DCI transmitted by the base station.
A scheme for scheduling a plurality of terminals in the same subframe; when a plurality of terminals are scheduled, the terminals can be scheduled in a wireless frame through molecular frame scheduling, and resources can be more effectively utilized.
Wherein the content of the first and second substances,
the base station is further configured to respectively indicate, in the uplink scheduling DCI, a subframe in which the corresponding terminal transmits uplink data when N terminals are scheduled to transmit uplink data in one radio frame, where N is 2 or 3.
When the subframe for sending the uplink data is indicated, a Bitmap form is used for indicating:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
In summary, in the present application, when the base station performs uplink scheduling, the UE may be selected to perform uplink transmission in the current frame or the next frame. And for the service with high delay requirement, the uplink delay requirement of the service can be met by adopting the current frame scheduling.
When a plurality of users are scheduled, the users can be scheduled in a wireless frame through molecular frame scheduling, and resources can be utilized more effectively.
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 (6)
1. A method for scheduling uplink service based on discrete sub-band is characterized in that the method comprises:
the base station adds an indication frame field in uplink scheduling Downlink Control Information (DCI) for indicating a wireless frame for sending uplink data;
when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame;
when the scheduled service is a service with a low time delay requirement, indicating a wireless frame for sending uplink data as a next wireless frame;
when sending uplink scheduling DCI to a terminal, indicating a wireless frame for sending uplink data in the uplink scheduling DCI according to the time delay requirement of a service and indicating a subframe for sending the uplink data;
and when the terminal receives the uplink scheduling DCI transmitted by the base station, transmitting the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated wireless frame for transmitting the uplink data.
2. The method of claim 1, further comprising:
when N terminals are scheduled to transmit uplink data in a wireless frame, indicating a subframe of the corresponding terminal for transmitting the uplink data in uplink scheduling DCI respectively, wherein N is 2 or 3.
3. The method according to claim 1 or 2, wherein the subframe for transmitting uplink data is indicated by using a Bitmap format to indicate:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
4. An uplink traffic scheduling system based on discrete sub-bands, the system comprising: a base station and a terminal;
a base station, configured to add an indication frame field in downlink control information DCI for uplink scheduling, to indicate a radio frame for transmitting uplink data; when the scheduled service is a service with high time delay requirement, indicating a wireless frame for sending uplink data as a current wireless frame; when the scheduled service is a service with a low time delay requirement, indicating a wireless frame for sending uplink data as a next wireless frame; when sending uplink scheduling DCI to a terminal, indicating a wireless frame for sending uplink data in the uplink scheduling DCI according to the time delay requirement of a service and indicating a subframe for sending the uplink data;
and the terminal is used for transmitting the uplink data on the subframe indicated by the uplink scheduling DCI in the indicated wireless frame for transmitting the uplink data when receiving the uplink scheduling DCI transmitted by the base station.
5. The system of claim 4,
the base station is further configured to respectively indicate, in the uplink scheduling DCI, a subframe in which the corresponding terminal transmits uplink data when N terminals are scheduled to transmit uplink data in one radio frame, where N is 2 or 3.
6. The system according to claim 4 or 5, wherein the subframe for transmitting uplink data is indicated by using a Bitmap form to indicate:
when the first bit of Bitmap is 1, the subframe for sending uplink data is a subframe 2;
when the first bit of Bitmap is 2, the subframe for sending uplink data is subframe 3;
when the first bit of Bitmap is 3, the subframe in which uplink data is transmitted is subframe 4.
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