CN107333330B - Communication control method and device under low-delay communication system - Google Patents
Communication control method and device under low-delay communication system Download PDFInfo
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Abstract
The application discloses a communication control method under a low-delay communication system, which comprises the following steps: allocating Physical Resource Blocks (PRBs) for a physical downlink shared channel and/or a physical uplink shared channel by adopting a bitmap (bitmap) mode; adopting a modulation coding scheme for removing a code rate and an order higher than a specified code rate to carry out communication coding; in Downlink Control Information (DCI), the allocated PRB is identified by the bit number corresponding to the bitmap mode, and the modulation coding scheme is identified by the bit number corresponding to the modulation coding scheme. The invention can reduce the air interface transmission time delay of the communication system and improve the communication quality at the same time.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication control method and apparatus in a low-latency communication system.
Background
At present, a low-delay and high-reliability communication technology is a research hotspot of future 5G communication. The requirement of low latency for communication systems is mainly reflected in that the latency needs to be controlled in milliseconds and the frequency of data exchange reaches tens of times per second. For a low-delay and high-reliability communication scene, stricter requirements are placed on transmission delay and reliability, for example, the single transmission delay of a single data packet user plane air interface is not more than 1ms, and the total delay of multiple retransmissions is not more than 10 ms.
However, the air interface delay of the most advanced Long Term Evolution (LTE) communication system is 5ms, and the corresponding communication control methods, including the resource block allocation method, the modulation and coding scheme, etc., cannot meet the 1ms air interface delay index of the 5G system, so that the requirements of a low-delay and high-reliability communication scenario cannot be met.
For example, in an existing communication system, because the requirement for delay is not high, the resource allocation granularity of a Physical Downlink Shared Channel (PDSCH) and/or a Physical Uplink Shared Channel (PUSCH) is small, and the number of required Physical Resource Blocks (PRBs) is large, the adopted allocation manner for the Physical resource blocks is generally allocated according to packets, for example, several PRBs must be configured into a group to allocate corresponding resources, which results in inflexible allocation, and for continuous PRB allocation, a large number of dynamic calculations are required, a large number of communication calculation resources are consumed, efficiency is low, and communication quality is low.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a communication control method and apparatus in a low-latency communication system, so as to reduce the air interface transmission latency of a communication system and improve the communication quality.
The technical scheme of the invention is realized as follows:
a communication control method under a low-delay communication system comprises the following steps:
allocating Physical Resource Blocks (PRBs) for a physical downlink shared channel and/or a physical uplink shared channel by adopting a bitmap mode;
adopting a modulation coding scheme for removing a code rate and an order higher than a specified code rate to carry out communication coding;
in the downlink control information DCI, the allocated PRB is identified by the bit number corresponding to the bitmap mode, and the modulation coding scheme is identified by the bit number corresponding to the modulation coding scheme.
In a preferred embodiment, the low latency communication standard is specifically configured to perform low latency communication in a manner lower than a specified transmission time interval TTI.
In a preferred embodiment, the low-latency communication is performed in a manner lower than a specified transmission time interval TTI, specifically, the low-latency communication is performed in a short TTI of n orthogonal frequency division multiplexing OFDM symbols, where n is a positive integer, n is greater than or equal to 1 and less than or equal to m, and m is a specified value.
In a preferred embodiment, for the case of a discontinuous PRB scheduling manner, in the DCI, the allocated PRB is identified by using a bit number corresponding to the bitmap manner, where the specific bit number is n × 5; for the case of a continuous PRB scheduling mode, in the DCI, the allocated PRBs are identified by the bit number corresponding to the bitmap mode, and the specific bit number is n × 4.
In a preferred embodiment, the modulation and coding schemes above a specified code rate and order are modulation and coding schemes of 64QAM and high code rate 16 QAM.
In a preferred embodiment, in the DCI, a bit number corresponding to the modulation coding scheme is used to identify the modulation coding scheme, and the specific bit number is 4.
In a preferred embodiment, the DCI is: DCI scheduled by a single-codeword physical downlink shared channel and/or DCI scheduled by a dual-codeword physical downlink shared channel.
In a preferred embodiment, the DCI includes any one of the following DCIs:
DCI corresponding to an open-loop spatial multiplexing mode;
DCI corresponding to a closed-loop spatial multiplexing mode;
DCI corresponding to a multi-user transmission mode;
DCI corresponding to the single and double current beamforming mode.
A communication control device under a low-latency communication system includes:
the resource allocation module is used for allocating physical resource blocks PRB for the physical downlink shared channel and/or the physical uplink shared channel by adopting a bitmap mode;
the modulation coding module is used for adopting a modulation coding scheme for removing the modulation coding scheme higher than the specified code rate and the specified order to carry out communication coding;
and the DCI module is used for identifying the allocated PRB by adopting the bit number corresponding to the bitmap mode and identifying the modulation coding scheme by adopting the bit number corresponding to the modulation coding scheme in the DCI.
In a preferred embodiment, the low latency communication standard is specifically configured to perform low latency communication in a manner lower than a specified transmission time interval TTI.
Compared with the prior art, the invention considers that the LTE frame structure is taken as a basis and a low time delay communication mode is adopted for compatibility with the LTE and reuse of the LTE frame structure as much as possible, and the low time delay communication mode specifically reduces the TTI length. Correspondingly, the invention provides a communication control method under a low-delay communication system, which comprises the following steps: the physical resource block PRB is distributed for the physical downlink shared channel and/or the physical uplink shared channel by adopting a bitmap (bitmap) mode, the scheme of distributing the PRB by using the bitmap mode can use fixed bits, dynamic calculation is not needed, the method is simple and flexible, and flexible scheduling is more important than signaling saving for a scene with less resource quantity, such as a low-delay communication mode, so that the air interface transmission delay of a communication system can be reduced by the bitmap-mode physical resource block distribution scheme, and the 1ms air interface delay index of a 5G system is realized. Meanwhile, the invention also adopts a modulation coding scheme for removing the code rate and the order higher than the appointed code rate to carry out communication coding, the bit number occupied by the scheme is less, and the signaling bit is saved; and finally, in the downlink control information DCI, adopting a bit number corresponding to the bitmap mode to identify the allocated PRB, and adopting a bit number corresponding to the modulation coding scheme to identify the modulation coding scheme. Compared with the existing LTE scheme, the scheme of the invention can reduce the air interface transmission delay of the communication system, realize the 1ms air interface delay index of the 5G system and simultaneously ensure higher communication quality.
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Fig. 1 is a schematic flow chart of a communication control method under a low-latency communication system according to the present invention;
fig. 2 is a schematic diagram of a communication control apparatus in a low latency communication system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic flow chart of a communication control method under a low-latency communication system according to the present invention. Referring to fig. 1, the core technical solution of the present invention includes:
101. allocating Physical Resource Blocks (PRBs) for a physical downlink shared channel and/or a physical uplink shared channel by adopting a bitmap (bitmap) mode;
102. adopting a modulation coding scheme for removing a code rate and an order higher than a specified code rate to carry out communication coding;
103. in the downlink control information DCI, the allocated PRB is identified by the bit number corresponding to the bitmap mode, and the modulation coding scheme is identified by the bit number corresponding to the modulation coding scheme.
The method of the present invention is explained in detail below.
In a 5G communication system, in order to meet a low-latency communication target, a low-latency communication standard is adopted, where the low-latency communication standard is: low latency communications are conducted in a manner that is less than a specified Transmission Time Interval (TTI), referred to as a short TTI for short. The TTI refers to the length of one independently decoded transmission in a radio link, and for example, in the standards of 3GPP LTE and LTE-a, 1TTI is generally considered to be 1ms, i.e., the size of one Subframe (Subframe), which is a basic unit of time governed by radio resource management. The short TTI refers to low latency communication using one Orthogonal Frequency Division Multiplexing (OFDM) symbol or more than one OFDM symbol but a few OFDM symbols. For example, in the present invention, the low-latency communication is performed in a manner of TTI lower than a specified transmission time interval, specifically, the low-latency communication is performed in a short TTI of n OFDM symbols, where n is a positive integer, n is greater than or equal to 1 and less than or equal to m, and m is a specified value.
However, a shorter TTI may cause great difficulty in channel estimation and demodulation, and significantly increase scheduling overhead and difficulty. For the segmentation of the big data packet service, the continuous transmission performance of the big data service is also affected. Therefore, the low-delay communication needs to adopt a reasonable frame structure and a control signaling design scheme so as to improve the reliability of the mobile communication system and meet the transmission requirement. The invention mainly aims to adopt a reasonable communication control method under a low-delay communication mode, reduce the control signaling overhead and reduce the air interface transmission delay of a communication system so as to improve the reliability of the mobile communication system and meet the transmission requirement.
In the following, an embodiment of the communication control method according to the present invention is given by taking a short TTI of one OFDM symbol in a single codeword as an example, and other transmission modes, such as an open-loop spatial multiplexing mode, a closed-loop spatial multiplexing mode, an MU mode, a single-stream/dual-stream beamforming mode, etc., corresponding DCI may be extended according to the embodiment, and corresponding fields are added. The technical solution of the present invention is not limited in the application scenario of this embodiment.
In the existing communication system, because the requirement for the time delay is not high, the resource allocation granularity of a Physical Downlink Shared Channel (PDSCH) and/or a Physical Uplink Shared Channel (PUSCH) is small, and the number of required Physical Resource Blocks (PRBs) is large, the adopted allocation manner for the Physical resource blocks is usually allocated according to packets, for example, several PRBs must be configured into a group to allocate corresponding resources, which results in the problems of inflexible allocation, and the need to calculate the starting position, length, and ending position for continuous PRB allocation, which requires a large amount of dynamic calculation, consumes a large amount of communication calculation resources, and is inefficient.
However, in the 5G communication system, a low-latency communication system is adopted, and in a short TTI design, for example, a short TTI of one OFDM symbol, in order to match a code rate of the existing LTE communication system, a resource allocation granularity of a PDSCH/PUSCH is larger, and the number of physical resource blocks to be indicated is smaller, so that fewer physical resource block allocation indication bits are required. Therefore, in the present invention, the allocation mode of the physical resource block adopts a bitmap mode, and a fixed bit can be used to indicate whether the corresponding physical resource block is allocated and occupied, wherein one bit indicates whether a corresponding physical resource block is occupied, if the value of the bit is 0, the corresponding physical resource block is not occupied, and if the value of the bit is 1, the corresponding physical resource block is occupied.
For the so-called non-compact scheduling method, which is used for a non-continuous Physical Resource Block (PRB) scheduling method, in this embodiment, the number of bits allocated to a resource block in the DCI format of the short TTI of one OFDM symbol may be set to 5 bits, for example, if the bit of the 5 bits is 11101, it indicates that the four other Physical resource blocks are required to be occupied except for the fourth Physical resource block.
Of course, this embodiment may also adopt a so-called compact scheduling method for a continuous PRB scheduling method, where the number of bits allocated to a resource block in a DCI format of a short TTI corresponding to one OFDM symbol is set to be
Of course, the bit number allocated to the resource block in the above continuous/discontinuous resource scheduling manner is for the short TTI of one OFDM symbol, and the bit number of "resource block allocation" needs to be adjusted for the short TTI formats of different numbers of OFDM symbols. For example, for short TTI formats of other numbers of OFDM symbols, if the transmission period is a short TTI subframe of n OFDM symbols, the number of bits allocated to the resource block is n × 5 for a discontinuous physical resource block scheduling manner; for the scheduling mode of the continuous physical resource blocks, the bit number allocated to the resource blocks is n × 4. Similarly, the number of "resource block allocation" bits set in different bandwidths of the LTE system is also dynamically calculated according to the bandwidth.
The physical resource block allocation scheme of the invention adopts a bitmap mode, can use fixed bits, does not need dynamic calculation, is simple and flexible, and is suitable for a continuous/discontinuous resource scheduling mode; for scenes with less resource quantity, flexible scheduling is more important than signaling saving, so the allocation scheme of the physical resource blocks in the bitmap mode can reduce the air interface transmission delay of a communication system and realize the 1ms air interface delay index of a 5G system.
On the other hand, for modulation coding schemes in 5G communication systems, corresponding modifications also need to be made. The traditional high-code-rate high-order modulation (such as 64QAM and high-code-rate 16QAM) has poor demodulation performance in a low-delay scene, so that the modulation coding mode of 64QAM and high-code-rate 16QAM is not adopted in a low-delay communication system. Specifically, in an embodiment of the present invention, for PDSCH modulation and Transport Block Size (TBS) index in a low latency communication system, modulation coding that removes higher than a specified code rate and order, for example, modulation coding that removes 64QAM and 16QAM with a high code rate, needs to be used. As shown in table 1 below, a specific PDSCH modulation and TBS index table of the low latency communication system is shown, and referring to table 1, after the modulation and coding modes of 64QAM and 16QAM with high code rate are removed, only 16 modulation and coding schemes remain in the index table, so that only 4 bits are needed to implement the modulation and coding scheme. Therefore, compared with the prior art, the TBS index table of the invention can further reduce the content to save the signaling bit, thereby meeting the requirements on low-delay and high-reliability communication in a 5G communication system.
TABLE 1
Because the invention adopts the above physical resource block allocation mode of bitmap mode and removes the modulation coding mode higher than the specified code rate and order, the corresponding DCI information of PDSCH scheduling can be different from the prior art. Specifically, in the downlink control information DCI, the allocated PRB is identified by the bit number corresponding to the bitmap mode, and the modulation coding scheme is identified by the bit number corresponding to the modulation coding scheme.
The following is a description of DCI information corresponding to the present invention, taking DCI information scheduled by a single-codeword PDSCH as an example. Table 2 below is a DCI information table for transmitting PDSCH single codeword information with low latency:
TABLE 2
See table 2, wherein:
the centralized/distributed VRB assignment flag is identified with 1 bit;
the resource block allocation scheme is identified by using 5 bits, as described above, where a bit with a value of 0 indicates that the corresponding physical resource block is not occupied, and a bit with a value of 1 indicates that the corresponding physical resource block is occupied; the resource block allocation scheme is as follows: identifying the allocated PRB by using the bit number corresponding to the bitmap mode; if the short TTI of n OFDM symbols is used for low latency communication, where n is a positive integer, n is equal to or greater than 1 and equal to or less than m, and m is a specified value, as described above, for the case of a discontinuous PRB scheduling scheme, the DCI identifies the allocated PRB by using the bit number corresponding to the bitmap scheme, and the specific bit number is n × 5; for the case of a continuous PRB scheduling mode, in the DCI, identifying the allocated PRBs by using the bit number corresponding to the bitmap mode, where the specific bit number is n × 4;
the modulation coding scheme is identified by adopting 4 bits, and the specific coding content is shown in table 1; here, the modulation and coding schemes higher than the specified code rate and order are specifically 64QAM and high-rate 16QAM modulation and coding schemes, so in the DCI, the modulation and coding scheme is identified by a bit number corresponding to the modulation and coding scheme, and the specific bit number is 4;
the HARQ process number is identified by 3 bits;
the new data indication is identified with 1 bit;
the redundancy version is identified by 2 bits;
the TPC command to PUCCH is identified with 2 bits.
Table 2 shows DCI information scheduled by a single-codeword PDSCH, where when PDSCH dual-codeword scheduling information is transmitted, the following information is added to the DCI information scheduled by the single-codeword PDSCH transmission:
the transmission block and the code word exchange mark occupy 1 bit;
the number of bits occupied by the precoding information;
mapping relation from transmission block to code word;
the modulation and coding schemes, new data indication and redundancy versions of 2 transport blocks are listed respectively, and specific information is as follows:
for transport block 1, the following information is included:
a modulation coding scheme, occupying 4 bits;
new data indication, occupying 1 bit;
redundancy version, occupying 2 bits;
for transport block 2, the following information is included:
a modulation coding scheme, occupying 4 bits;
new data indication, occupying 1 bit;
redundancy version, taking 2 bits.
From the above, it can be seen that the DCI format according to the present invention has the following advantages:
A) the resource block allocation adopts bitmap, can use fixed bits, does not need dynamic calculation, is simple and flexible, and is suitable for a continuous/discontinuous resource scheduling mode; for scenes with less resource quantity, flexible scheduling is more important than signaling saving, so a bitmap mode is designed;
B) a modulation coding scheme with less bits is adopted to meet the design requirement of the system;
C) the resource block allocation design method and modulation and coding scheme in the DCI information scheduled by the single codeword PDSCH are also applicable to the uplink scheduling DCI and other transmission mode DCI, for example, the applicable DCI may include any of the following DCIs:
the DCI corresponding to the open-loop spatial multiplexing mode,
the DCI corresponding to the closed-loop spatial multiplexing mode,
a user transmission (MU) mode corresponding to the DCI,
DCI corresponding to the single and double current beam forming modes;
D) the design method for shorter DCI transmission bit reduces the control signaling overhead and reduces the air interface transmission delay of the communication system.
The method of the invention can be applied to the downstream communication control, such as the communication control of the base station side.
Corresponding to the method, the invention also discloses a communication control device under the low-delay communication system, which is used for executing the method. Fig. 2 is a schematic diagram of a communication control device in a time-delay communication system according to the present invention, and referring to fig. 2, the communication control device includes:
a resource allocation module 201, configured to allocate a physical resource block PRB for a physical downlink shared channel and/or a physical uplink shared channel in a bitmap manner;
a modulation coding module 202, configured to perform communication coding by using a modulation coding scheme excluding a code rate and an order higher than a specified code rate;
a DCI module 203, configured to identify the allocated PRB by using the bit number corresponding to the bitmap mode and identify the modulation coding scheme by using the bit number corresponding to the modulation coding scheme in DCI.
Specifically, the low-latency communication system is configured to perform low-latency communication in a manner lower than a specified transmission time interval TTI. For example, the low-latency communication may specifically be performed in a short TTI mode using n OFDM symbols, where n is a positive integer, n is greater than or equal to 1 and less than or equal to m, and m is a specified value.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The functional modules of the embodiments may be located in one terminal or network node, or may be distributed over a plurality of terminals or network nodes.
In addition, each of the embodiments of the present invention can be realized by a data processing program executed by a data processing apparatus such as a computer. It is clear that the data processing program constitutes the invention. Further, the data processing program, which is generally stored in one storage medium, is executed by directly reading the program out of the storage medium or by installing or copying the program into a storage device (such as a hard disk and/or a memory) of the data processing device. Such a storage medium therefore also constitutes the present invention. The storage medium may use any type of recording means, such as a paper storage medium (e.g., paper tape, etc.), a magnetic storage medium (e.g., a flexible disk, a hard disk, a flash memory, etc.), an optical storage medium (e.g., a CD-ROM, etc.), a magneto-optical storage medium (e.g., an MO, etc.), and the like.
The invention therefore also discloses a storage medium in which a data processing program is stored which is designed to carry out any one of the embodiments of the method according to the invention described above.
In addition, the method steps described in the present invention can be implemented by hardware, for example, logic gates, switches, Application Specific Integrated Circuits (ASICs), programmable logic controllers, embedded microcontrollers and the like, in addition to data processing programs. Such hardware capable of implementing the methods of the present invention may also constitute the present invention.
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 communication control method under a low-delay communication system is characterized by comprising the following steps:
allocating Physical Resource Blocks (PRBs) for a physical downlink shared channel and/or a physical uplink shared channel by adopting a bitmap mode;
adopting a modulation coding scheme for removing a code rate and an order higher than a specified code rate to carry out communication coding;
in the downlink control information DCI, adopting a bit number corresponding to the bitmap mode to identify the allocated PRB, and adopting a bit number corresponding to the modulation coding scheme to identify the modulation coding scheme;
the low-delay communication system specifically performs low-delay communication in a manner of being lower than a specified Transmission Time Interval (TTI);
the low-delay communication is carried out in a mode of TTI lower than a specified transmission time interval, specifically, the low-delay communication is carried out in a short TTI mode of n orthogonal frequency division multiplexing OFDM symbols, wherein n is a positive integer, the value of n is more than or equal to 1 and less than or equal to m, and m is a specified value;
for the case of a discontinuous PRB scheduling mode, in the DCI, identifying the allocated PRBs by using the bit number corresponding to the bitmap mode, where the specific bit number is n × 5;
for the case of a continuous PRB scheduling mode, in the DCI, the allocated PRBs are identified by the bit number corresponding to the bitmap mode, and the specific bit number is n × 4.
2. The communication control method according to claim 1, characterized in that the modulation coding schemes above a specified code rate and order, in particular 64QAM and high code rate 16 QAM.
3. The communication control method according to claim 2, wherein the DCI identifies the modulation and coding scheme by a bit number corresponding to the modulation and coding scheme, and the specific bit number is 4.
4. The communication control method according to any one of claims 1 to 3, wherein the DCI is: DCI scheduled by a single-codeword physical downlink shared channel and/or DCI scheduled by a dual-codeword physical downlink shared channel.
5. The communication control method according to any one of claims 1 to 3, wherein the DCI includes any one of the following DCIs:
DCI corresponding to an open-loop spatial multiplexing mode;
DCI corresponding to a closed-loop spatial multiplexing mode;
DCI corresponding to a multi-user transmission mode;
DCI corresponding to the single and double current beamforming mode.
6. A communication control apparatus in a low-latency communication system, comprising:
the resource allocation module is used for allocating physical resource blocks PRB for the physical downlink shared channel and/or the physical uplink shared channel by adopting a bitmap mode;
the modulation coding module is used for adopting a modulation coding scheme for removing the modulation coding scheme higher than the specified code rate and the specified order to carry out communication coding;
a DCI module, configured to identify the allocated PRB by using a bit number corresponding to the bitmap mode and identify the modulation coding scheme by using a bit number corresponding to the modulation coding scheme in DCI; the low-delay communication system is used for carrying out low-delay communication in a mode of a Transmission Time Interval (TTI) lower than a specified TTI; the low-delay communication is carried out in a mode of TTI lower than a specified transmission time interval, specifically, the low-delay communication is carried out in a short TTI mode of n orthogonal frequency division multiplexing OFDM symbols, wherein n is a positive integer, the value of n is more than or equal to 1 and less than or equal to m, and m is a specified value; for the case of a discontinuous PRB scheduling mode, in the DCI, identifying the allocated PRB by using a bit number corresponding to the bitmap mode, wherein the bit number is n × 5; for the case of a continuous PRB scheduling mode, in the DCI, the allocated PRBs are identified by the bit number corresponding to the bitmap mode, where the bit number is n × 4.
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| CN101378289A (en) * | 2008-09-23 | 2009-03-04 | 中兴通讯股份有限公司 | Method and apparatus for denoting physical resource |
| CN102487548A (en) * | 2010-12-06 | 2012-06-06 | 中国移动通信集团公司 | Machine type communication system, information sending and obtaining method, base station and terminals |
| CN103139924A (en) * | 2011-12-05 | 2013-06-05 | 华为技术有限公司 | Method and device for scheduling resources |
| CN103428862A (en) * | 2012-05-23 | 2013-12-04 | 华为技术有限公司 | Resource distribution method and device |
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| CN101378289A (en) * | 2008-09-23 | 2009-03-04 | 中兴通讯股份有限公司 | Method and apparatus for denoting physical resource |
| CN102487548A (en) * | 2010-12-06 | 2012-06-06 | 中国移动通信集团公司 | Machine type communication system, information sending and obtaining method, base station and terminals |
| CN103139924A (en) * | 2011-12-05 | 2013-06-05 | 华为技术有限公司 | Method and device for scheduling resources |
| CN103428862A (en) * | 2012-05-23 | 2013-12-04 | 华为技术有限公司 | Resource distribution method and device |
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