CN107872883B - Method and device for indicating and determining downlink control information format - Google Patents

Method and device for indicating and determining downlink control information format Download PDF

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CN107872883B
CN107872883B CN201610851855.4A CN201610851855A CN107872883B CN 107872883 B CN107872883 B CN 107872883B CN 201610851855 A CN201610851855 A CN 201610851855A CN 107872883 B CN107872883 B CN 107872883B
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dci
short tti
information
information field
indication
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CN107872883A (en
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王磊
潘学明
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Abstract

The invention discloses a method and a device for indicating and determining a downlink control information format, wherein the method comprises the following steps: when the length of the downlink control information bit of the short transmission time interval is the same as that of the downlink control information bit of the traditional subframe, the downlink control information bit carries an indication in an information domain, and the indication indicates that the downlink control information is the downlink control information of the traditional subframe or the downlink control information of the short transmission time interval; and after receiving the downlink control information, determining the downlink control information to be the downlink control information of the traditional subframe or the downlink control information of the short transmission time interval according to the indication. The invention can distinguish the downlink control information of the traditional sub-frame with the same size from the downlink control information of the short transmission time interval, and is beneficial to reducing the blind detection times of the terminal when the short downlink control information is transmitted in the traditional control area.

Description

Method and device for indicating and determining downlink control information format
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for indicating and determining a downlink control information format.
Background
The mobile internet is subverting the traditional mobile communication business mode, providing unprecedented use experience for users, and profoundly influencing the aspects of work and life of people. The mobile internet can promote further upgrading of human social information interaction modes, and provide richer business experiences such as augmented reality, virtual reality, ultra-high definition (3D) video and mobile cloud for users. The further development of the mobile internet will bring the mobile traffic to thousands of times increase in the future, and promote a new revolution of mobile communication technology and industry. The internet of things expands the service range of mobile communication, and extends from person-to-person communication to intelligent interconnection of people and objects, so that the mobile communication technology permeates into wider industries and fields. In the future, mobile medical treatment, internet of vehicles, smart home, industrial control, environmental monitoring and the like will promote the explosive growth of internet of things application, and hundreds of millions of devices will access the network to realize real 'everything interconnection'. Meanwhile, a large amount of equipment connection and diversified internet of things services can bring new technical challenges to mobile communication.
With the continuous emergence and enrichment of new service demands, higher performance demands are put on future mobile communication systems, such as higher peak rate, better user experience rate, smaller delay, higher reliability, higher spectrum efficiency and higher energy consumption efficiency, and the like, and more users need to be supported to access and use various service types. In order to support various terminal connections with huge number and different service types, flexible configuration of uplink and downlink resources becomes a great trend of technical development. Shortening the Time domain length of TTI (Transmission Time Interval) becomes a key method for reducing the data Transmission delay.
Fig. 1 is a schematic diagram of a frame structure 1 used by an LTE FDD system, and a frame structure 1 (abbreviated as FS1) used by a conventional LTE (Long Term Evolution ) FDD (Frequency Division Duplex) system is shown in fig. 1. In an FDD system, uplink and downlink transmissions use different carrier frequencies, and both uplink and downlink transmissions use the same frame structure. On each carrier, a 10ms long radio frame consists of 10 1ms subframes, each of which is divided into two 0.5ms slots. The TTI duration for uplink and downlink data transmission is 1 ms.
Fig. 2 is a schematic diagram of a frame structure 2 used in an LTE TDD system, and a frame structure 2 (FS 2) used in a conventional LTE TDD (Time Division Duplex) system is shown in fig. 2. In a TDD system, uplink and downlink transmissions use different subframes or different time slots on the same frequency. Each 10ms radio frame in FS2 consists of two 5ms fields, each field containing 5 subframes of 1ms length. Subframes in FS2 are divided into three categories: the subframe comprises a Downlink subframe, an Uplink subframe and special subframes, wherein each special subframe comprises a DwPTS (Downlink Pilot Time Slot), a GP (Guard Period) and an UpPTS (Uplink Pilot Time Slot). The DwPTS can transmit downlink pilot frequency, downlink service data and downlink control signaling; the GP does not transmit any signal; the UpPTS transmits only a random access and SRS (Sounding Reference signal), and cannot transmit uplink traffic or uplink control information. Each half frame comprises at least 1 downlink subframe, at least 1 uplink subframe and at most 1 special subframe. Table 1 shows 7 uplink and downlink subframe configurations supported in FS 2.
Table 1: uplink-downlink configurations (Uplink and downlink configuration)
Figure BDA0001121002110000021
FIG. 3 is a Downlink resource gridIt is intended that, as shown in the figure, in the conventional LTE, the minimum resource granularity is one OFDM (Orthogonal Frequency Division multiplexing) symbol in the time domain, and one subcarrier in the Frequency domain. (k, l) is the number of a basic RE (resource element). Wherein
Figure BDA0001121002110000031
Figure BDA0001121002110000032
PRB (physical resource Block) is a resource unit of a larger dimension, consisting of
Figure BDA0001121002110000033
And RE. One subframe has one PRB pair (PRB pair), which is a basic unit for data resource allocation.
In the LTE system, a DCI (Downlink Control Information) is carried by a PDCCH (physical Downlink Control channel) and is used for transmitting uplink/Downlink scheduling Information and related common Control Information. Depending on the information contained in the DCI, a plurality of formats are defined. For example, dcifomat 0/4 is used for uplink data scheduling, DCI format1/1A/1B/1C/1D/2/2a/2B/2C is used for downlink data scheduling, and for different transmission modes/applications, DCI of each format includes different numbers of information bits and different meanings of information fields. The DCI includes most information required for scheduling a UE (User Equipment), such as resource allocation, MCS (Modulation and Coding Scheme), HARQ ID (HARQ ID; hybrid automatic Repeat Request), NDI (New Data Indicator), and the like.
The terminal distinguishes different DCI formats according to different DCI sizes (lengths). For different DCI formats with the same DCI size, a display bit in the DCI is used to indicate which DCI format the DCI is.
But the defects of the prior art are as follows: in some cases, the terminal cannot distinguish the DCI format according to the display bit indication in the DCI.
Disclosure of Invention
The invention provides a method and a device for indicating and determining a DCI format, which are used for distinguishing a traditional DCI format from a short TTI DCI format when control information of a short TTI is transmitted in a traditional control region.
The embodiment of the invention provides a method for indicating a DCI format, which comprises the following steps:
determining that the DCI information bit length of the short TTI is the same as that of the legacy subframe;
carrying an indication in the information domain of the DCI of the legacy subframe and the DCI of the short TTI, wherein the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or, scrambling the DCI of the legacy subframe and the DCI of the short TTI by using different RNTI values.
Preferably, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in a legacy control region.
Preferably, the length of the DCI of the short TTI is the same as that of DCI format0/1A of the legacy subframe.
Preferably, the information field carrying the indication is located in a specific information field of information bit in DCI of short TTI and DCI format 0/1A.
Preferably, the specific information field is the first information field of all information bits of the DCI starting from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
Preferably, the information field carrying the indication contains 1bit information.
Preferably, further comprising:
when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, no indication is carried in the information domain.
Preferably, the CRC of the DCI of the legacy subframe and the CRC of the DCI of the short TTI are scrambled using different RNTIs.
The embodiment of the invention provides a method for determining a DCI format, which comprises the following steps:
after receiving the DCI, determining that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to the indication, wherein the information domain of the DCI carries the indication, and the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI;
or after receiving the DCI, determining the DCI as DCI of legacy subframes or DCI of short TTI according to different RNTIs;
the DCI information bit length of the short TTI is the same as that of the legacy subframe.
Preferably, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in a legacy control region.
Preferably, the length of the DCI of the short TTI is the same as that of DCI format0/1A of the legacy subframe.
Preferably, the information field carrying the indication is located in a specific information field of information bit in DCI of short TTI and DCI format 0/1A.
Preferably, the specific information field is the first information field of all information bits of the DCI starting from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
Preferably, the information field carrying the indication contains 1bit information.
Preferably, further comprising:
and when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, not determining the DCI format according to the indication.
Preferably, after the terminal receives the DCI, the DCI is distinguished as the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled by using the different RNTI.
The embodiment of the invention provides a device for indicating a DCI format, which comprises the following steps:
a determining module, configured to determine that a DCI information bit length of the short TTI is the same as a DCI information bit length of the legacy subframe;
an indication module, configured to carry an indication in an information domain of DCI of a legacy subframe and DCI of a short TTI, where the indication is used to indicate that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or, scrambling the DCI of the legacy subframe and the DCI of the short TTI by using different RNTI values.
Preferably, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in a legacy control region.
Preferably, the length of the DCI of the short TTI is the same as that of DCI format0/1A of the legacy subframe.
Preferably, the indication module is further configured to carry the indication in a specific information field of the information bit in the DCI of the short TTI and the DCI format 0/1A.
Preferably, the specific information field is the first information field of all information bits of the DCI starting from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
Preferably, the information field carrying the indication contains 1bit information.
Preferably, the indication module is further configured to not carry the indication in the information domain when the DCI of the short TTI is not transmitted in the control region of legacy and/or when the DCI of the short TTI is transmitted in the control region of the short TTI.
Preferably, the indication module is further configured to scramble a CRC of the DCI of the legacy subframe and a CRC of the DCI of the short TTI using different RNTIs.
The embodiment of the invention provides a device for determining a DCI format, which comprises the following steps:
a receiving module, configured to receive DCI;
a distinguishing module, configured to determine, after receiving the DCI, that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to the indication, where an indication is carried in an information domain of the DCI, and the indication is used to indicate that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or after receiving the DCI, determining the DCI as DCI of legacy subframes or DCI of short TTI according to different RNTIs;
the DCI information bit length of the short TTI is the same as that of the legacy subframe.
Preferably, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in a legacy control region.
Preferably, the length of the DCI of the short TTI is the same as that of DCI format0/1A of the legacy subframe.
Preferably, the information field carrying the indication is located in a specific information field of information bit in DCI of short TTI and DCI format 0/1A.
Preferably, the specific information field is the first information field of all information bits of the DCI starting from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
Preferably, the information field carrying the indication contains 1bit information.
Preferably, the distinguishing module is further configured to not determine the DCI format according to the indication when the DCI for the short TTI is not transmitted in the control region of legacy and/or when the DCI for the short TTI is transmitted in the control region of the short TTI.
The distinguishing module is further used for distinguishing the DCI into DCI of legacy subframes or DCI of short TTI according to CRC scrambled by different RNTIs after the DCI is received.
The invention has the following beneficial effects:
in the technical solution provided in the embodiment of the present invention, when it is determined that the DCI of the legacy subframe and the DCI of the short TTI are consistent in length, a DCI indication for indicating that the DCI is the legacy subframe or the DCI of the short TTI is carried in the information domain, so that the terminal can distinguish the DCI of the legacy subframe and the DCI of the short TTI having the same size according to the indication.
In another mode, because the Network side scrambles the DCI of the legacy subframe and the DCI of the short TTI with different RNTI (Radio Network temporary identifier) values, the terminal side can also determine that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to different RNTIs.
Furthermore, because the DCI of the legacy subframes and the DCI of the short TTI with the same size can be distinguished, the technical solution provided in the embodiment of the present invention can also help to reduce the number of blind detections of the short DCI in legacy control region transmission.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a diagram of a frame structure 1 used in an LTE FDD system in the background art;
fig. 2 is a diagram of a frame structure 2 used in an LTE TDD system in the background art;
FIG. 3 is a diagram of a Downlink resource grid in the prior art;
fig. 4 is a flowchart illustrating an implementation of a method for indicating a DCI format by a network side according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of an implementation of a method for determining a DCI format at a terminal side according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for indicating a DCI format at a network side according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an apparatus for determining a DCI format at a terminal side according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a base station structure according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a terminal structure in an embodiment of the present invention.
Detailed Description
With the development of mobile technology, future mobile communication systems need to provide lower network latency and support richer traffic types. A TTI length shorter than 1ms may bring about an increase in throughput and a decrease in transmission time, and is a hot spot in current research. The inventor notices in the process of invention that:
in the existing LTE system, different DCI formats generally have different sizes, so a terminal can distinguish the different DCI formats by using a bit length (bit length) to determine an analysis method of each information field in DCI. The DCI format0/1A needs to be distinguished by using Flag format0/format1A differentiation (differentiation Flag of format 0/1A) because the bit lengths of the two formats are the same. However, when the control information of the short TTI is transmitted in the legacy control region and the bit length is the same as the bit length of the DCI of the legacy subframe, the terminal cannot determine whether the DCI is the DCI of the legacy subframe or the DCI of the short TTI, and may erroneously analyze the information field in the DCI, thereby failing to correctly receive or transmit data.
That is, when the control information of the short TTI is transmitted in the legacy control region, there is no clear scheme to distinguish the legacy subframe DCI format from the short TTI DCI format. Based on this, the embodiment of the present invention provides a scheme for distinguishing the DCI format of the conventional subframe from the DCI format of the short TTI. The following describes embodiments of the present invention with reference to the drawings.
In the description, the implementation from the base station side and the terminal side respectively will be described, and then an example of the cooperative implementation of the two will be given to better understand the implementation of the scheme given in the embodiment of the present invention. However, such an explanation does not mean that both must be implemented in cooperation or separately, and actually, when the terminal and the base station are implemented separately, it is possible to solve the problems on the terminal side and the base station side, respectively, and when both are used in combination, a better technical effect is obtained.
It should be noted that, since the behaviors of the base station side and the terminal side are generally corresponding, one side will be mainly described for the sake of simplicity, but this does not mean that the other side which is not described has no corresponding implementation, and a person skilled in the art should be able to understand the implementation of the corresponding side based on common knowledge.
Fig. 4 is a flowchart illustrating an implementation of a method for indicating a DCI format on a network side, where as shown in the figure, the method may include:
step 401, determining that the length of the DCI information bit of the short TTI is the same as that of the DCI information bit of the legacy subframe;
step 402, carrying an indication in the information domain of the DCI of the legacy subframe and the DCI of the short TTI, wherein the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or, scrambling the DCI of the legacy subframe and the DCI of the short TTI by using different RNTI values.
Fig. 5 is a schematic flowchart of an implementation process of the method for determining a DCI format at a terminal side, where as shown in the figure, when a DCI information bit length of a short TTI is the same as a DCI information bit length of a legacy subframe, the method may include:
step 501, receiving DCI.
Step 502, after receiving the DCI, determining that the DCI is a legacy subframe DCI or a short TTI DCI according to the indication, where an indication is carried in an information domain of the DCI, and the indication is used to indicate that the DCI is a legacy subframe DCI or a short TTI DCI; or after receiving the DCI, determining that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to different RNTIs.
Specifically, a DCI type indication field may be added at a specific position of a DCI information bit by using a specific information field in the DCI, so as to indicate that the DCI is a legacy subframe DCI or a short-TTI DCI.
In an implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a USS (UE-specific search space) in a legacy control region.
Specifically, the DCI of the Legacy subframe and the DCI of the short TTI of the terminal are simultaneously transmitted in the USS in the Legacy control region.
In an implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.
In implementation, the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
In a specific implementation, the specific information field is a first information field of all information bits of the DCI starting from a lower bit;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
Specifically, the DCI type indication field may be located in a specific information field of an information bit in DCI.
The specific information field refers to the first information field of all information bits of the DCI starting from the low order, for example, all information bits in the DCI are a0, a1, … and aN from the low order to the high order, and the first information field is bit information represented by a 0;
the specific information field refers to a second information field of the DCI from the lower bit, for example, all information bits in the DCI are a0, a1, … and aN from the lower bit to the upper bit, assuming that a0, a1 and a3 are bit information of the first information field, and the second information field is bit information represented by a 4;
the specific information field may be other specific positions except the first information field and the second information field in all information bits of the DCI.
In implementation, the information field carrying the indication contains 1bit information.
Specifically, the DCI type indication field includes 1-bit information, which may be expressed as follows:
0 or 1 indicates that the DCI is the DCI of the legacy subframe, and the terminal analyzes the information domain in the DCI according to the DCI of the legacy subframe;
1 or 0 indicates that the DCI is the DCI of the short TTI, and the terminal analyzes the information domain in the DCI according to the DCI of the short TTI;
in the implementation, the network side may further include:
when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, no indication is carried in the information domain.
Correspondingly, the terminal side may further include:
and when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, not determining the DCI format according to the indication.
Specifically, when the DCI of the legacy subframe and the DCI of the short TTI do not need to be distinguished, the DCI type indication field may not occur:
when the network configures or notifies the DCI, the DCI of the short TTI is not transmitted in the legacy control region, the DCI type indication field may not exist in the DCI of the legacy subframe;
when the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI type indication region may not be present in the DCI of the short TTI.
In the RNTI scrambling method, in the network side, the CRC (cyclic redundancy Check) of the DCI of the legacy subframe and the CRC of the DCI of the short TTI are scrambled using different RNTIs.
Correspondingly, on the terminal side, after the terminal receives the DCI, the DCI is distinguished as DCI of legacy subframes or DCI of short TTI according to CRC scrambled by using different RNTIs.
The following description is made with reference to examples.
For the sake of clear distinction and convenience of description, in the embodiments, the short TTI is denoted as sTTI, and the DCI transmitted on the sTTI, that is, the DCI of the short TTI is denoted as sdic; representing the DCI of the legacy subframe as the DCI of the legacy subframe; in addition, in the embodiment, the DCI for the short TTI and the DCI for scheduling the short TTI data have one meaning, and the DCI for the legacy subframe and the DCI for scheduling the legacy subframe data have one meaning. Of course, not only in the examples, but also in other parts of the application, the same designations denote the same meaning.
Example 1:
assuming that the UE transmits data in the first sTTI of the subframe, the DCI scheduled to be transmitted by the terminal in the sTTI is referred to as sdic in this embodiment. The sDCI is transmitted in legacy control region. Meanwhile, DCI of legacy subframe transmitted by the UE on the normal subframe is assumed to be DCI format 1A. In order to reduce the number of blind detections on the terminal side and the processing complexity, the size of the sddci is the same as that of the DCI format 0/1A. Assuming that the bit length of the sDCI and the DCI format0/1A is M bits, the terminal blindly detects the DCI according to the M bits in its search space, and since the sDCI and the DCI format0/1A have the same size, the terminal may receive the sDCI and the DCI format1A through a set of blind detections.
After receiving the sDCI or the DCI format1A, the terminal determines that the current DCI is sDCI or DCI format1A according to bit information of the first information field. For example, if the 1bit information of the first information field is 0, the current DCI is determined to be DCI format1A, and then each information field in the DCI is analyzed according to the DCI format 1A; and if the 1bit information of the first information domain is 1, judging that the current DCI is sDCI, and then analyzing each information domain in the DCI according to the mode of the sDCI.
Table 2: DCI format1A and sDCI format information field
Figure BDA0001121002110000121
Example 2:
assuming that the UE transmits data in the first sTTI of the subframe, the DCI scheduled to be transmitted by the terminal in the sTTI is referred to as sdic in this embodiment. The sDCI is transmitted in legacy control region. Meanwhile, the DCI of the legacy subframe transmitted by the UE on the normal subframe is assumed to be DCI format 1A. In order to reduce the number of blind detections on the terminal side and the processing complexity, the size of the sddci is the same as that of the DCI format 0/1A. Assuming that the bit length of the sDCI and the dcifomat 1A is M bits, the terminal blindly detects the DCI according to the M bits in its search space, and since the sDCI and the dcifomat 1A have the same size, the terminal may receive the sDCI and the DCI format1A through one set of blind detection.
After receiving the sDCI or the DCI format1A, the terminal determines that the current DCI is sDCI or DCI format1A according to the bit information of the second information field. For example, if the 1bit information of the second information field is 0, the current DCI is determined to be DCI format1A, and then each information field in the DCI is analyzed according to the DCI format 1A; and if the 1bit information of the second information domain is 1, judging that the current DCI is sDCI, and then analyzing each information domain in the DCI according to the mode of the sDCI.
Table 3: DCI format1A and sDCI format information field
Example 3:
assuming that the UE transmits data in the first sTTI of the subframe, the DCI scheduled to be transmitted by the terminal in the sTTI is referred to as sdic in this embodiment. The sDCI is transmitted in legacy control region. Meanwhile, DCI of legacy subframe transmitted by the UE on the generic subframe is assumed to be DCI format 0. In order to reduce the number of blind detections on the terminal side and the processing complexity, the size of the sddci is the same as that of the DCI format 0/1A. Assuming that the bit length of the sDCI and DCIformat0/1A is M bits, the terminal blindly detects the DCI according to M bits in its search space, and since the size of the sDCI and the DCI format0/1A is the same, the terminal can receive the sDCI and the DCI format0 through a set of blind detection.
After receiving the sDCI or the DCI format0, the terminal determines that the current DCI is sDCI or DCI format0/1A according to the bit information of the second information field. For example, if the 1bit information of the second information field is 0, the current DCI is determined to be DCI format0/1A, then the current DCI is determined to be DCI format0 according to Flag format0/1A, and then each information field in the DCI is analyzed according to DCI format 0; and if the 1bit information of the second information domain is 1, judging that the current DCI is sDCI, and then analyzing each information domain in the DCI according to the mode of the sDCI.
Table 4: DCI format0 and sDCI format information field
Figure BDA0001121002110000141
Example 4:
the DCI type indication field in embodiments 1 to 3 may be placed at other specific positions in the DCI information bit, and is not described herein again.
Example 5:
assuming that the UE is scheduled to transmit data in a short TTI, the dci of the terminal is scheduled to be transmitted in the control region of the short TTI. Only sDCI is transmitted in the control region of the short TTI, and the transmission is not confused with DCI of a legacy subframe, so that a DCI type indication domain does not exist in the sDCI transmitted in the control region of the short TTI, and the terminal analyzes each information domain in the sDCI according to the assumption that the DCI type indication domain does not exist after receiving the sDCI.
Example 6:
if the terminal is notified through the network or the DCI, and the control information of the sTTI cannot be transmitted in legacy control region, the DCI type indication field does not exist in the DCI for scheduling normal subframe data transmission transmitted in legacy control region, the base station transmits the DCI without the DCI type indication field, and the terminal analyzes each information field in the DCI without the DCI type indication field.
Example 7:
assuming that the UE transmits data in the first sTTI of the subframe, the DCI scheduled to be transmitted by the terminal in the sTTI is referred to as sdic in this embodiment. The sDCI is transmitted in legacy control region. Meanwhile, DCI of legacy subframe transmitted by the UE on the normal subframe is assumed to be DCI format 1A. In order to reduce the number of blind detections on the terminal side and the processing complexity, the size of the sddci is the same as that of the DCI format 0/1A. Assuming that the bit length of the sDCI and the DCI format0/1A is M bits, the terminal blindly detects the DCI according to the M bits in its search space, and since the sDCI and the DCI format0/1A have the same size, the terminal may receive the sDCI and the DCI format1A through a set of blind detections.
Assuming that for DCI of legacy subframes, the base station side scrambles CRC using RNTI 1; for DCI of sTTI, the base station side scrambles CRC using RNTI 2. The terminal side is also aware of the correspondence between RNTI and CRC. And after receiving the DCI, the terminal checks the DCI according to CRC scrambled by using different RNTI values. And if the terminal successfully checks the DCI according to the CRC scrambled by the RNTI1, judging that the DCI is the DCI of the legacy subframe, and analyzing the information domain according to the format of the DCI format 1A. And if the terminal successfully checks the DCI according to the CRC scrambled by the RNTI2, judging that the DCI is the DCI of the sTTI, and analyzing the information domain according to the sDCI format.
Based on the same inventive concept, the embodiments of the present invention further provide a device for indicating and determining a DCI format, and because the principle of solving the problem of these devices is similar to a method for indicating and determining a DCI format, the implementation of these devices may refer to the implementation of the method, and repeated details are not repeated.
Fig. 6 is a schematic structural diagram of an apparatus for indicating a DCI format on a network side, as shown in the figure, the apparatus may include:
a determining module 601, configured to determine that the DCI information bit length of the short TTI is the same as the DCI information bit length of the legacy subframe;
an indicating module 602, configured to carry an indication in an information domain of DCI of a legacy subframe and DCI of a short TTI, where the indication is used to indicate that the DCI is DCI of a legacy subframe or DCI of a short TTI; or, scrambling the DCI of the legacy subframe and the DCI of the short TTI by using different RNTI values.
In an implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.
In an implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.
In an implementation, the indication module is further configured to carry the indication in a specific information field of the information bit in the DCI of the short TTI and the DCI format 0/1A.
In implementation, the specific information field is the first information field of all information bits of the DCI from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
In implementation, the information field carrying the indication contains 1bit information.
In an implementation, the indication module is further configured to not carry the indication in the information domain when the DCI of the short TTI is not transmitted in the control region of legacy and/or when the DCI of the short TTI is transmitted in the control region of the short TTI.
In an implementation, the indication module is further configured to scramble a CRC of the DCI of the legacy subframe and a CRC of the DCI of the short TTI using different RNTIs.
Fig. 7 is a schematic structural diagram of an apparatus for determining a DCI format on a terminal side, as shown in the figure, the apparatus may include:
a receiving module 701, configured to receive DCI;
a distinguishing module 702, configured to determine, after receiving the DCI, that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to the indication, where an information domain of the DCI carries the indication, and the indication is used to indicate that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or after receiving the DCI, determining the DCI as DCI of legacy subframes or DCI of short TTI according to different RNTIs;
the DCI information bit length of the short TTI is the same as that of the legacy subframe.
In an implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.
In an implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.
In implementation, the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
In implementation, the specific information field is the first information field of all information bits of the DCI from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
In implementation, the information field carrying the indication contains 1bit information.
In an implementation, the distinguishing module is further configured to not determine the DCI format according to the indication when the DCI for the short TTI is not transmitted in the control region of legacy and/or when the DCI for the short TTI is transmitted in the control region of the short TTI.
The distinguishing module is further used for distinguishing the DCI into DCI of legacy subframes or DCI of short TTI according to CRC scrambled by different RNTIs after the DCI is received.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.
When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.
Fig. 8 is a schematic structural diagram of a base station, as shown in the figure, the base station includes:
the processor 800, which is used to read the program in the memory 820, executes the following processes:
determining that the DCI information bit length of the short TTI is the same as that of the legacy subframe;
a transceiver 810 for receiving and transmitting data under the control of the processor 800, performing the following processes:
carrying an indication in the information domain of the DCI of the legacy subframe and the DCI of the short TTI, wherein the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or, scrambling the DCI of the legacy subframe and the DCI of the short TTI by using different RNTI values.
In an implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.
In an implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.
In implementation, the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
In implementation, the specific information field is the first information field of all information bits of the DCI from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
In implementation, the information field carrying the indication contains 1bit information.
In an implementation, the method further comprises the following steps:
when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, no indication is carried in the information domain.
In an implementation, the CRC of the DCI of the legacy subframe and the CRC of the DCI of the short TTI are scrambled using different RNTIs.
Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 810 may be a number of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.
Fig. 9 is a schematic structural diagram of a terminal, and as shown in the figure, the terminal includes:
a processor 900 for reading the program in the memory 920, executing the following processes:
after receiving the DCI, determining that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to the indication, wherein the information domain of the DCI carries the indication, and the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI;
or after receiving the DCI, determining the DCI as DCI of legacy subframes or DCI of short TTI according to different RNTIs;
the DCI information bit length of the short TTI is the same as that of the legacy subframe;
a transceiver 910 for receiving and transmitting data under the control of the processor 900, performing the following processes:
receiving the DCI.
In an implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.
In an implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.
In implementation, the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
In implementation, the specific information field is the first information field of all information bits of the DCI from the lower order;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
In implementation, the information field carrying the indication contains 1bit information.
In an implementation, the method further comprises the following steps:
and when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, not determining the DCI format according to the indication.
In implementation, after the terminal receives the DCI, the DCI is distinguished as the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled by using the different RNTI.
In fig. 9, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 900, and various circuits, represented by memory 920, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 910 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 930 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 900 in performing operations.
In summary, in the technical solution provided in the embodiment of the present invention, when the DCI of the legacy subframe is the same as the sdic i for scheduling sTTI data transmission, a DCI type indication field is added to the DCI of the legacy subframe and the sdic i for determining that the DCI is the DCI or the sdic of the legacy subframe.
The technical scheme provided by the embodiment of the invention can be used for distinguishing the DCI and the sDCI of the legacy subframes with the same size, and is beneficial to reducing the blind detection times of the terminal when the sDCI is transmitted in the legacy control region.
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, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (28)

1. A method for indicating a Downlink Control Information (DCI) format is characterized by comprising the following steps:
determining that the DCI information bit length of the short transmission time interval TTI is the same as that of the traditional legacy subframe;
carrying an indication in the information domain of the DCI of the legacy subframe and the DCI of the short TTI, wherein the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or scrambling DCI of legacy subframes and DCI of short TTI by using different RNTI values; the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a user-specific search space USS in a legacy control region.
2. The method of claim 1, wherein a length of the DCI for the short TTI is the same as DCIformat0/1A for a legacy subframe.
3. The method of claim 1, wherein the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
4. The method of claim 3, wherein the specific information field is a first information field of all information bits of the DCI starting from lower bits;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
5. The method of claim 1, wherein the information field carrying the indication comprises 1-bit information.
6. The method of any of claims 1 to 5, further comprising:
when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, no indication is carried in the information domain.
7. The method of claim 1, wherein a Cyclic Redundancy Check (CRC) of the DCI of the legacy subframe and a CRC of the DCI of the short TTI are scrambled using different RNTIs.
8. A method of determining a DCI format, comprising:
after receiving the DCI, determining that the DCI is the DCI of a legacy subframe or the DCI of a short TTI according to an indication, wherein the information domain of the DCI carries the indication, and the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI;
or after receiving the DCI, determining the DCI as DCI of legacy subframes or DCI of short TTI according to different RNTIs;
the DCI information bit length of the short TTI is the same as that of the legacy subframe; the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.
9. The method of claim 8, wherein a length of the DCI for the short TTI is the same as DCIformat0/1A for a legacy subframe.
10. The method of claim 8, wherein the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
11. The method of claim 10, wherein the specific information field is a first information field of all information bits of the DCI starting from lower bits;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
12. The method of claim 8, wherein the information field carrying the indication comprises 1-bit information.
13. The method of any of claims 8 to 12, further comprising:
and when the DCI of the short TTI is not transmitted in the control region of legacy, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, not determining the DCI format according to the indication.
14. The method of claim 8, wherein after the terminal receives the DCI, the DCI is distinguished as a DCI of a legacy subframe or a DCI of a short TTI according to a CRC scrambled with a different RNTI.
15. An apparatus for indicating a DCI format, comprising:
a determining module, configured to determine that a DCI information bit length of the short TTI is the same as a DCI information bit length of the legacy subframe;
an indication module, configured to carry an indication in an information domain of DCI of a legacy subframe and DCI of a short TTI, where the indication is used to indicate that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or scrambling DCI of legacy subframes and DCI of short TTI by using different RNTI values; the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in legacy control region.
16. The apparatus of claim 15, wherein a length of the DCI for the short TTI is the same as DCIformat0/1A for a legacy subframe.
17. The apparatus of claim 15, wherein the indication module is further configured to carry the indication in a specific information field of an information bit in DCI for a short TTI and DCI format 0/1A.
18. The apparatus of claim 17, wherein the specific information field is a first information field of all information bits of the DCI starting from lower bits;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
19. The apparatus of claim 15, wherein the information field carrying the indication comprises 1-bit information.
20. The apparatus of any of claims 15 to 19, wherein the indication module is further configured to not carry the indication in the information domain when the DCI for the short TTI is not transmitted in the control region of legacy and/or when the DCI for the short TTI is transmitted in the control region of the short TTI.
21. The apparatus of claim 15, wherein the indication module is further configured to scramble a CRC of the DCI for the legacy subframe and a CRC of the DCI for the short TTI using different RNTIs.
22. An apparatus for determining a DCI format, comprising:
a receiving module, configured to receive DCI;
the distinguishing module is used for determining that the DCI is the DCI of the legacy subframe or the DCI of the short TTI according to the indication after the DCI is received, wherein the information domain of the DCI carries the indication, and the indication is used for indicating that the DCI is the DCI of the legacy subframe or the DCI of the short TTI; or after receiving the DCI, determining the DCI as DCI of legacy subframes or DCI of short TTI according to different RNTIs;
the DCI information bit length of the short TTI is the same as that of the legacy subframe; the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.
23. The apparatus of claim 22, wherein a length of the DCI for the short TTI is the same as DCIformat0/1A for a legacy subframe.
24. The apparatus of claim 22, wherein the information field carrying the indication is located in a specific information field of information bit in DCI of a short TTI and DCI format 0/1A.
25. The apparatus of claim 24, wherein the specific information field is a first information field of all information bits of the DCI starting from lower bits;
or, the specific information field is a second information field of all information bits of the DCI from the low order;
or, the specific information field is other specific positions except the first information field and the second information field in all the information bits of the DCI.
26. The apparatus of claim 22, wherein the information field carrying the indication comprises 1-bit information.
27. The apparatus of any of claims 22 to 26, wherein the distinguishing module is further configured to not determine the DCI format based on the indication when the DCI for the short TTI is not transmitted in the control region of legacy and/or when the DCI for the short TTI is transmitted in the control region of the short TTI.
28. The apparatus of claim 22, wherein the distinguishing module is further configured to distinguish the DCI as a DCI for a legacy subframe or a DCI for a short TTI based on a CRC scrambled with a different RNTI after the DCI is received.
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