CN106793112B - MCS information indicating method, MCS information indicating device, base station and terminal - Google Patents
MCS information indicating method, MCS information indicating device, base station and terminalDownload PDFInfo
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Abstract
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an MCS information indication method, an MCS information indication apparatus, a base station, and a terminal.
Background
With the development of the mobile internet, a large number of application services satisfying various specific functions are emerging. Some of the services have low requirements on data delay, such as sending and receiving mails, downloading movies, etc.; however, there are other services that have strict requirements on data delay, such as online games, robbery, red packet robbery, etc., and these services usually require the user data delay to be as short as possible. In an LTE (Long Term Evolution) network, TTI (Transmission time interval) is an important index that affects user data delay. A TTI (legacy TTI) adopted by the current LTE system is 1ms, that is, one subframe, a transmitting end transmits a data block every 1ms, and a receiving end can receive a data block every 1 ms.
The issue of using shorter TTIs in LTE networks has been established in the 3GPP RAN #69 society, investigating the feasibility and possible beneficial effects of using shorter duration TTIs (short-TTIs, hereinafter abbreviated as sTTI, e.g. 0.5ms, etc.). At present, some documents such as [ R1-160942] [ R1-160930] quantitatively study the influence of the reduction of the TTI duration on the LTE data delay, and analysis shows that the TTI usage is not only the transmission time interval of the base station and the terminal becomes shorter, and correspondingly, the data processing time corresponding to the transmission interval also decreases, for example, the data coding modulation and data demodulation time both decrease with the decrease of the data block size. In a LTE network of a subsequent release, a situation may occur in which UEs (User equipments) using both transmission intervals of legacy TTI and sTTI coexist.
In the LTE system, there are at most 32 Modulation and Coding schemes (MCS, Modulation and Coding strategy) options. When the channel condition is better, the MCS value that can be used is larger, and the modulation order and coding efficiency that can be adopted when corresponding data is transmitted are higher, the data transmission rate is larger. In the case of using legacy TTI, if the user is scheduled by dynamic scheduling, 5 bits of DCI (Downlink control information) to be transmitted to the scheduled user in each TTI are required to indicate the MCS used by the scheduled TTI. If the MCS used by the scheduled user is also indicated in the sTTI in the same manner, because the duration of the sTTI is shorter, one legacy TTI generally includes a plurality of sttis, and more resources need to be occupied in unit time to carry the MCS information, which causes a larger overhead of downlink control information.
Disclosure of Invention
Based on at least one of the above technical problems, the present invention provides a new MCS information indication scheme, which can effectively reduce the overhead of downlink control information.
In view of this, the present invention provides an MCS information indicating method for a base station, including: configuring MCS information for a first type TTI and a second type TTI in target downlink control information, wherein the duration of the first type TTI is an integral multiple of the duration of the second type TTI, the first type TTI is configured with a reference MCS value, the second type TTI is configured with an offset value, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value; and sending the target downlink control information to a terminal to indicate the terminal to determine the actual MCS value of the second type TTI.
In the technical scheme, a reference MCS value is configured for the first type TTI and an offset value is configured for the second type TTI in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required by indicating the MCS information is reduced, and the overhead of the downlink control information is effectively reduced.
In the foregoing technical solution, preferably, the reference MCS value is an actual MCS value of any one TTI of the second type of TTI.
In the technical scheme, when the reference MCS value is the actual MCS value of any TTI in the second type TTI, the bit number required for indicating the offset value of any TTI is 0, so that the overhead of downlink control information is further reduced. Of course, the reference MCS value can take other values, and is not limited to the actual MCS value of any TTI in the second type of TTI.
In any one of the above technical solutions, preferably, the step of sending the target downlink control information to the terminal specifically includes: aiming at the first type TTI, the reference MCS value is sent to the terminal based on the physical layer downlink control signaling; and aiming at the second TTI, sending the offset value to the terminal based on the physical layer downlink control signaling.
According to a second aspect of the present invention, there is provided a MCS information indicating method for a terminal, comprising: receiving target downlink control information sent by a base station, wherein the target downlink control information is configured with a reference MCS value of a first TTI and an offset value of a second TTI, the offset value represents an offset value of an actual MCS value of the second TTI relative to the reference MCS value, a duration of the first TTI is an integral multiple of a duration of the second TTI, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value; and determining the actual MCS value of the second type TTI according to the reference value and the offset value.
In the technical scheme, the terminal determines the actual MCS value of the second type TTI according to the reference value and the offset value by receiving the target downlink control information sent by the base station, wherein the reference MCS value of the first type TTI and the offset value of the second type TTI are configured in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required for indicating the MCS information is reduced, the overhead of the downlink control information is effectively reduced, and the terminal is ensured to accurately determine the actual MCS value of the second type TTI.
According to a third aspect of the present invention, there is provided an MCS information indicating apparatus for a base station, comprising: a configuration unit, configured to configure MCS information for a first type TTI and a second type TTI in target downlink control information, where a duration of the first type TTI is an integer multiple of a duration of the second type TTI, the first type TTI is configured with a reference MCS value, the second type TTI is configured with an offset value, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value; and a sending unit, configured to send the target downlink control information to a terminal, so as to instruct the terminal to determine an actual MCS value of the second type TTI.
In the technical scheme, a reference MCS value is configured for the first type TTI and an offset value is configured for the second type TTI in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required by indicating the MCS information is reduced, and the overhead of the downlink control information is effectively reduced.
In the foregoing technical solution, preferably, the reference MCS value is an actual MCS value of any one TTI of the second type of TTI.
In the technical scheme, when the reference MCS value is the actual MCS value of any TTI in the second type TTI, the bit number required for indicating the offset value of any TTI is 0, so that the overhead of downlink control information is further reduced. Of course, the reference MCS value can take other values, and is not limited to the actual MCS value of any TTI in the second type of TTI.
In any one of the foregoing technical solutions, preferably, the sending unit is specifically configured to: aiming at the first type TTI, the reference MCS value is sent to the terminal based on the physical layer downlink control signaling; and aiming at the second TTI, sending the offset value to the terminal based on the physical layer downlink control signaling.
According to a fourth aspect of the present invention, an MCS information indicating apparatus for a terminal is provided, comprising: a receiving unit, configured to receive target downlink control information sent by a base station, where the target downlink control information is configured with a reference MCS value of a first type TTI and an offset value of a second type TTI, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, a duration of the first type TTI is an integer multiple of a duration of the second type TTI, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value; and a determining unit, configured to determine an actual MCS value of the second type TTI according to the reference value and the offset value.
In the technical scheme, the terminal determines the actual MCS value of the second type TTI according to the reference value and the offset value by receiving the target downlink control information sent by the base station, wherein the reference MCS value of the first type TTI and the offset value of the second type TTI are configured in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required for indicating the MCS information is reduced, the overhead of the downlink control information is effectively reduced, and the terminal is ensured to accurately determine the actual MCS value of the second type TTI.
According to the fifth aspect of the present invention, there is also provided a base station, including: the MCS information indicating apparatus according to any one of the above technical solutions.
According to a sixth aspect of the present invention, there is also provided a terminal, comprising: the MCS information indicating apparatus according to any one of the above technical solutions.
By the technical scheme, the overhead of the downlink control information can be effectively reduced.
Drawings
FIG. 1 shows a schematic flow diagram of a MCS information indication method according to one embodiment of the invention;
FIG. 2 is a schematic flow chart diagram illustrating a MCS information indication method according to another embodiment of the present invention;
FIG. 3 shows a schematic block diagram of an MCS information indication apparatus according to an embodiment of the present invention;
FIG. 4 shows a schematic block diagram of an MCS information indication apparatus according to another embodiment of the present invention;
FIG. 5 shows a schematic block diagram of a base station according to an embodiment of the invention;
fig. 6 shows a schematic block diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 shows a schematic flow diagram of a MCS information indication method according to one embodiment of the present invention.
As shown in fig. 1, the MCS information indication method according to an embodiment of the present invention is applied to a base station, and includes:
102, configuring MCS information for a first type TTI and a second type TTI in target downlink control information, wherein a duration of the first type TTI is an integral multiple of a duration of the second type TTI, the first type TTI is configured with a reference MCS value, the second type TTI is configured with an offset value, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value.
And 104, sending the target downlink control information to a terminal to indicate the terminal to determine the actual MCS value of the second type TTI.
In the technical scheme, a reference MCS value is configured for the first type TTI and an offset value is configured for the second type TTI in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required by indicating the MCS information is reduced, and the overhead of the downlink control information is effectively reduced.
In the foregoing technical solution, preferably, the reference MCS value is an actual MCS value of any one TTI of the second type of TTI.
In the technical scheme, when the reference MCS value is the actual MCS value of any TTI in the second type TTI, the bit number required for indicating the offset value of any TTI is 0, so that the overhead of downlink control information is further reduced. Of course, the reference MCS value can take other values, and is not limited to the actual MCS value of any TTI in the second type of TTI.
Specifically, a first category TTI is set to be 1 legacy TTI, a second category TTI is set to be one sTTI, where one legacy TTI includes 4 sTTI, and if dynamic scheduling is performed in each sTTI, in a scenario where one UE is scheduled each time, in a conventional scheme, a bit number used for indicating an MCS in one legacy TTI is 5 × 4 ═ 20 bits, in this embodiment, an offset value of an actual MCS of the 3-bit flag sTTI with respect to a reference MCS is used, and a bit number used for indicating an MCS in one legacy TTI is 5+3 × 4 ═ 17 bits, so that 3 bits are saved in one legacy TTI, and overhead of downlink control information is reduced.
Furthermore, the reference MCS of the legacy TTI is set to the actual MCS value of the first sTTI of the legacy TTI, and at this time, the number of bits used for indicating the MCS in one legacy TTI is 5+3 × 3 — 14 bits, which saves 6 bits in one legacy TTI and further reduces the overhead of downlink control information. In addition, in a legacy TTI, MCSs used by a user are concentrated within a certain range, considering that an sTTI is generally applied to a medium-low speed mobile environment with a better channel condition, and in the medium-low speed mobile environment, the time variability of a channel is generally lower, and the channel condition is more consistent, so that the influence of reduced matching degree with the channel due to the fact that the MCSs are concentrated within a certain range in a legacy TTI can be ignored.
In any one of the above technical solutions, preferably, the step of sending the target downlink control information to the terminal specifically includes: aiming at the first type TTI, the reference MCS value is sent to the terminal based on the physical layer downlink control signaling; and aiming at the second TTI, sending the offset value to the terminal based on the physical layer downlink control signaling.
Fig. 2 shows a schematic flow diagram of an MCS information indication method according to another embodiment of the present invention.
As shown in fig. 2, an MCS information indication method according to another embodiment of the present invention is applied to a terminal, and includes:
And step 204, determining the actual MCS value of the second TTI according to the reference value and the offset value.
In the technical scheme, the terminal determines the actual MCS value of the second type TTI according to the reference value and the offset value by receiving the target downlink control information sent by the base station, wherein the reference MCS value of the first type TTI and the offset value of the second type TTI are configured in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required for indicating the MCS information is reduced, the overhead of the downlink control information is effectively reduced, and the terminal is ensured to accurately determine the actual MCS value of the second type TTI.
Fig. 3 shows a schematic block diagram of an MCS information indication apparatus according to one embodiment of the present invention.
As shown in fig. 3, the MCS information indicating apparatus 300 according to an embodiment of the present invention is for a base station, including: a configuration unit 302 and a sending unit 304.
The configuration unit 302 is configured to configure MCS information for a first type TTI and a second type TTI in target downlink control information, where a duration of the first type TTI is an integer multiple of a duration of the second type TTI, the first type TTI is configured with a reference MCS value, the second type TTI is configured with an offset value, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value; the sending unit 304 is configured to send the target downlink control information to a terminal to instruct the terminal to determine an actual MCS value of the second type TTI.
In the technical scheme, a reference MCS value is configured for the first type TTI and an offset value is configured for the second type TTI in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required by indicating the MCS information is reduced, and the overhead of the downlink control information is effectively reduced.
In the foregoing technical solution, preferably, the reference MCS value is an actual MCS value of any one TTI of the second type of TTI.
In the technical scheme, when the reference MCS value is the actual MCS value of any TTI in the second type TTI, the bit number required for indicating the offset value of any TTI is 0, so that the overhead of downlink control information is further reduced. Of course, the reference MCS value can take other values, and is not limited to the actual MCS value of any TTI in the second type of TTI.
In any one of the above technical solutions, preferably, the sending unit 304 is specifically configured to: aiming at the first type TTI, the reference MCS value is sent to the terminal based on the physical layer downlink control signaling; and aiming at the second TTI, sending the offset value to the terminal based on the physical layer downlink control signaling.
Fig. 4 shows a schematic block diagram of an MCS information indicating apparatus according to another embodiment of the present invention.
As shown in fig. 4, an MCS information indicating apparatus 400 according to another embodiment of the present invention is for a terminal, including: a receiving unit 402 and a determining unit 404.
The receiving unit 402 is configured to receive target downlink control information sent by a base station, where the target downlink control information is configured with a reference MCS value of a first type TTI and an offset value of a second type TTI, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, a duration of the first type TTI is an integer multiple of a duration of the second type TTI, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value; the determining unit 404 is configured to determine an actual MCS value of the second type TTI according to the reference value and the offset value.
In the technical scheme, the terminal determines the actual MCS value of the second type TTI according to the reference value and the offset value by receiving the target downlink control information sent by the base station, wherein the reference MCS value of the first type TTI and the offset value of the second type TTI are configured in the target downlink control information, and the bit number for indicating the reference MCS value is greater than the bit number for indicating the offset value, so that the bit number required for indicating the MCS information is reduced, the overhead of the downlink control information is effectively reduced, and the terminal is ensured to accurately determine the actual MCS value of the second type TTI.
Fig. 5 shows a schematic block diagram of a base station according to an embodiment of the invention.
As shown in fig. 5, a base station 500 according to an embodiment of the present invention includes: such as MCS information indication means 300 shown in fig. 3.
Fig. 6 shows a schematic block diagram of a terminal according to an embodiment of the present invention.
As shown in fig. 6, a terminal 600 according to an embodiment of the present invention includes: the MCS information indicating apparatus 400 shown in fig. 4.
The technical scheme of the present invention is described in detail above with reference to the accompanying drawings, and the present invention provides a new MCS information indication scheme, which can effectively reduce the overhead of downlink control information.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A MCS information indication method for a base station, comprising:
configuring MCS information for a first type TTI and a second type TTI in target downlink control information, wherein the duration of the first type TTI is an integral multiple of the duration of the second type TTI, the first type TTI is configured with a reference MCS value, the second type TTI is configured with an offset value, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value;
sending the target downlink control information to a terminal to indicate the terminal to determine the actual MCS value of the second type TTI;
the reference MCS value is the actual MCS value of any TTI in the second type TTI;
the step of sending the target downlink control information to the terminal specifically includes:
aiming at the first type TTI, the reference MCS value is sent to the terminal based on the physical layer downlink control signaling;
and aiming at the second TTI, sending the offset value to the terminal based on the physical layer downlink control signaling.
2. A MCS information indication method for a terminal, comprising:
receiving target downlink control information sent by a base station, wherein the target downlink control information is configured with a reference MCS value of a first TTI and an offset value of a second TTI, the offset value represents an offset value of an actual MCS value of the second TTI relative to the reference MCS value, a duration of the first TTI is an integral multiple of a duration of the second TTI, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value;
determining the actual MCS value of the second type TTI according to the reference MCS value and the offset value;
the reference MCS value is the actual MCS value of any TTI in the second type TTI.
3. An apparatus for indicating MCS information for a base station, comprising:
a configuration unit, configured to configure MCS information for a first type TTI and a second type TTI in target downlink control information, where a duration of the first type TTI is an integer multiple of a duration of the second type TTI, the first type TTI is configured with a reference MCS value, the second type TTI is configured with an offset value, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value;
a sending unit, configured to send the target downlink control information to a terminal to instruct the terminal to determine an actual MCS value of the second type TTI;
the reference MCS value is the actual MCS value of any TTI in the second type TTI;
the sending unit is specifically configured to:
aiming at the first type TTI, the reference MCS value is sent to the terminal based on the physical layer downlink control signaling;
and aiming at the second TTI, sending the offset value to the terminal based on the physical layer downlink control signaling.
4. An apparatus for indicating MCS information for a terminal, comprising:
a receiving unit, configured to receive target downlink control information sent by a base station, where the target downlink control information is configured with a reference MCS value of a first type TTI and an offset value of a second type TTI, the offset value represents an offset value of an actual MCS value of the second type TTI relative to the reference MCS value, a duration of the first type TTI is an integer multiple of a duration of the second type TTI, and a bit number used for indicating the reference MCS value is greater than a bit number used for indicating the offset value;
a determining unit, configured to determine an actual MCS value of the second type TTI according to the reference MCS value and the offset value;
the reference MCS value is the actual MCS value of any TTI in the second type TTI.
5. A base station, comprising: the MCS information indication apparatus of claim 3.
6. A terminal, comprising: the MCS information indication apparatus of claim 4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611076415.2ACN106793112B (en) | 2016-11-30 | 2016-11-30 | MCS information indicating method, MCS information indicating device, base station and terminal |
| PCT/CN2017/087976WO2018099039A1 (en) | 2016-11-30 | 2017-06-12 | Mcs information indication method, mcs information indication device, base station and terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611076415.2ACN106793112B (en) | 2016-11-30 | 2016-11-30 | MCS information indicating method, MCS information indicating device, base station and terminal |
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| CN109089317B (en)* | 2017-06-14 | 2022-05-17 | 华为技术有限公司 | Parameter configuration method, terminal device, network side device and communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101911813A (en)* | 2008-01-07 | 2010-12-08 | 三星电子株式会社 | Apparatus and method for transmitting and receiving enhanced random access channel in mobile communication system |
| US20160128028A1 (en)* | 2014-10-31 | 2016-05-05 | Qualcomm Incorporated | Two-stage pdcch with dci flag and dci format size indicator |
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| CN106793112B (en)* | 2016-11-30 | 2020-09-29 | 珠海市魅族科技有限公司 | MCS information indicating method, MCS information indicating device, base station and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101911813A (en)* | 2008-01-07 | 2010-12-08 | 三星电子株式会社 | Apparatus and method for transmitting and receiving enhanced random access channel in mobile communication system |
| US20160128028A1 (en)* | 2014-10-31 | 2016-05-05 | Qualcomm Incorporated | Two-stage pdcch with dci flag and dci format size indicator |
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