CN108737018B - Method and device for sending and processing downlink control channel - Google Patents

Method and device for sending and processing downlink control channel Download PDF

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CN108737018B
CN108737018B CN201710267214.9A CN201710267214A CN108737018B CN 108737018 B CN108737018 B CN 108737018B CN 201710267214 A CN201710267214 A CN 201710267214A CN 108737018 B CN108737018 B CN 108737018B
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pdcch
frame
dci
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rmax
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CN108737018A (en
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金奕丹
龚秋莎
冯绍鹏
池连刚
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder

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Abstract

The invention provides a method and a device for sending and processing a downlink control channel, wherein the method comprises the following steps: performing framing processing on DCI data of a Physical Downlink Control Channel (PDCCH) according to a preset maximum repetition number of the PDCCH; if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data; and if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as one period. In consideration of the problem of coverage enhancement, the invention periodically issues the PDCCH by redesigning the transmission method of the PDCCH, and users with poor coverage can further improve the demodulation performance of the system by high repetition times, improve the coverage performance and further enhance the transmission reliability.

Description

Method and device for sending and processing downlink control channel
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for processing downlink control channel transmission.
Background
The transmission process of a PDCCH (Physical Downlink Control channel) at an evolved nodeb (eNB) end may be divided into several parts, such as the construction, encoding, scrambling, modulation, and transmission of DCI (Downlink Control Information) Information, as shown in fig. 1. Correspondingly, the information processing process of the PDCCH receiving end of each user can be divided into several parts, namely information extraction, equalization, deinterleaving, demodulation, descrambling and blind detection.
However, with the continuous development of new wireless communication technologies and the explosion development of the mobile internet and internet of things industries, the demands of various industries for low-speed, low-cost, wide-coverage and large-capacity services are rapidly expanding. The demodulation performance of the current private network system is not high, and the requirement of wide coverage cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a device for sending and processing a downlink control channel, which can solve the problems that the private network system in the prior art is not high in demodulation performance and cannot meet the requirement of wide coverage.
In a first aspect, the present invention provides a method for sending and processing a downlink control channel, where the method includes:
performing framing processing on DCI data of a Physical Downlink Control Channel (PDCCH) according to a preset maximum repetition number of the PDCCH;
if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data;
if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as a period;
the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
Optionally, the PDCCH resource is increased to 13 OFDM symbols.
Optionally, the method further comprises:
scrambling all the jointly coded 8-frame resources by using scrambling codes generated by the same initial value;
wherein an initial value c of the scrambling code sequenceinitAs shown in equation one:
Figure BDA0001276365290000021
wherein, the subBandIndex represents the absolute sub-band index number of the sub-band where the PDCCH is located; nf is the frame number of the first effective frame in the 8 frames of the joint coding, namely the frame for transmitting the PDCCH of the asynchronous frame; if the 1 st frame in the 8-frame resources allocated to the PDCCH is a synchronous signal, nf is the frame number corresponding to the 2 nd frame, otherwise nf is the frame number corresponding to the 1 st frame;
Figure BDA0001276365290000022
indicating the cell ID.
In a second aspect, the present invention provides a method for sending and processing a downlink control channel, where the method includes:
the terminal UE jointly detects the special search space according to the preset frame number and the preset PDCCH maximum repetition times;
the UE demodulates the DCI to obtain a DCI repeated field, and determines the number of the PDCCH residual frames needing to be received according to the DCI repeated field and the PDCCH maximum repetition frequency;
when the UE merges data, the UE takes 8 frames as a unit and serially merges the jointly coded 8 frames of data.
Optionally, the jointly detecting, by the terminal UE, the dedicated search space according to a preset frame number and a preset PDCCH maximum repetition number includes:
when the UE detects the USS of the user-specific search space, if the maximum repetition time Rmax of a preset PDCCH is less than or equal to 4, jointly detecting the USS according to 1 frame, 2 frames and 4 frames;
and if the preset maximum repetition times Rmax of the PDCCH is more than or equal to 8, jointly detecting the USS according to Rmax/8, Rmax/4, Rmax/2 and Rmax frames.
Optionally, the method further comprises:
the UE feeds back ACK/NACK to a base station through a Physical Downlink Shared Channel (PDSCH) so that the base station can adjust a preset maximum repetition time (Rmax) value of a Physical Downlink Control Channel (PDCCH) according to the ACK/NACK;
and the UE acquires an updated Rmax value according to the RRC connection reconfiguration message sent by the base station.
In a third aspect, the present invention provides a device for processing downlink control channel transmission, where the device includes:
a framing unit, configured to perform framing processing on DCI data of a physical downlink control channel PDCCH according to a preset maximum number of repetitions of the PDCCH;
a first coding unit, configured to jointly code according to the frame number of the DCI data if the frame number of the DCI data subjected to framing processing is less than 8, and send the coded DCI data;
a second coding unit, configured to, if the number of frames of the DCI data subjected to framing processing is greater than or equal to 8, adopt 8-frame joint coding, and repeatedly send the coded DCI data with 8 frames as one cycle;
the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
Optionally, the apparatus further comprises: a scrambling unit to:
scrambling all the jointly coded 8-frame resources by using scrambling codes generated by the same initial value;
wherein an initial value c of the scrambling code sequenceinitAs shown in equation one:
Figure BDA0001276365290000041
wherein, the subBandIndex represents the absolute sub-band index number of the sub-band where the PDCCH is located; nf is the frame number of the first effective frame in the 8 frames of the joint coding, namely the frame for transmitting the PDCCH of the asynchronous frame; if the 1 st frame in the 8-frame resources allocated to the PDCCH is a synchronous signal, nf is the frame number corresponding to the 2 nd frame, otherwise nf is the frame number corresponding to the 1 st frame;
Figure BDA0001276365290000042
indicating the cell ID.
In a fourth aspect, the present invention provides a device for processing downlink control channel transmission, where the device includes:
the detection unit is used for jointly detecting the special search space according to the preset frame number and the preset PDCCH maximum repetition times;
the demodulation unit is used for demodulating DCI to obtain a DCI repeated field and determining the number of PDCCH frames needing to be received according to the DCI repeated field and the PDCCH maximum repetition frequency;
and the data merging unit is used for performing serial merging on the jointly coded 8 frame data by taking 8 frames as a unit.
Optionally, the detection unit is specifically configured to:
when a user-specific search space USS is detected, if the preset maximum repetition times Rmax of a PDCCH is less than or equal to 4, jointly detecting the USS according to 1 frame, 2 frames and 4 frames;
and if the preset maximum repetition times Rmax of the PDCCH is more than or equal to 8, jointly detecting the USS according to Rmax/8, Rmax/4, Rmax/2 and Rmax frames.
According to the technical scheme, the invention provides a method and a device for sending and processing a downlink control channel, which are used for framing DCI data of a Physical Downlink Control Channel (PDCCH) according to the preset maximum repetition times of the PDCCH; if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data; and if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as one period. Therefore, in consideration of the problem of coverage enhancement, the invention redesigns the transmission method of the PDCCH channel, and periodically issues the PDCCH, and users with poor coverage can further improve the demodulation performance of the system by high repetition times, improve the coverage performance and further enhance the transmission reliability.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an information processing procedure of a base station in the prior art;
fig. 2 is a flowchart illustrating a method for processing downlink control channel transmission according to an embodiment of the present invention;
fig. 3 is a diagram illustrating different repetition times of a PDCCH according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for processing downlink control channel transmission according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a device for processing downlink control channel transmission according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a device for processing downlink control channel transmission according to another embodiment of the present invention;
fig. 7 is a block diagram of a base station according to an embodiment of the present invention;
fig. 8 is a block diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a flowchart illustrating a method for processing downlink control channel transmission in an embodiment of the present invention, where an execution subject of the embodiment is a base station, that is, a transmitting end, and as shown in fig. 2, the method includes the following steps:
s201: and according to the preset maximum repetition times of the PDCCH, performing framing processing on the DCI data of the PDCCH.
The number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by a Physical Control Format Indicator Channel (PCFICH) resource and the number of OFDM symbols occupied by a Physical hybrid automatic repeat request Indicator Channel (PHICH) resource. Namely, PCFICH and PHICH channels are cancelled, and PDCCH resources are added to 13 OFDM symbols to support the periodic transmission and reception of the PDCCH.
In addition, the maximum number of times of repetition of the PDCCH is determined according to the coverage level configured by the network. If the repetition times are set to users with poor coverage, the repetition times are set to be lower for users with good coverage.
Specifically, the DCI data is transmitted in frames according to a preset correspondence relationship between the PDCCH repetition number and the DCI repetition number (as shown in table 1). As shown in fig. 3, when the PDCCH repetition number is 1/2/4/8, the PDCCH DCI data is transmitted in frames as shown in fig. 3; when the PDCCH repetition number is 16 or more, the PDCCH DCI is divided into 8 frames, and the transmission is repeated with 8 frames as one Cycle.
S202: and if the frame number of the DCI data subjected to framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data.
Specifically, after repeated for many times, the PDCCH DCI information bits are jointly encoded according to the actual number of frames, with 8 frames as one Cycle, which is smaller than 8 frames.
S203: and if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as one period.
Specifically, after the PDCCH DCI information bits are repeated for multiple times, 8 frames are used as one Cycle, and if the number of the cycles is greater than or equal to 8 frames, 8 frames are used for joint coding and repeated transmission, and the same code block is used for scrambling.
Therefore, in the embodiment, the frame processing is performed on the DCI data of the PDCCH according to the preset maximum number of repetitions of the PDCCH; if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data; and if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as one period. Therefore, in the embodiment, in consideration of the problem of coverage enhancement, the transmission method of the PDCCH channel is redesigned, the PDCCH is issued periodically, and a user with poor coverage can further improve the demodulation performance of the system by high repetition times, so that the coverage performance is improved, and the transmission reliability is further enhanced.
It should be noted that a DCI repetition number field (DCI repetition number) is set in the UL/DL grant (downlink scheduling grant/uplink scheduling grant) to indicate the number of repetitions of the DCI (from the search start position), and a relationship with a preset PDCCH maximum number of repetitions, i.e., PDCCH-NumRepetitions-uss (rmax), is shown in table 1:
TABLE 1Rmax vs. DCI repetition
Figure BDA0001276365290000071
Thus, when the UE detects the USS, the USS can be jointly detected according to 1 frame, 2 frames and 4 frames (Rmax is less than or equal to 4) or Rmax/8, Rmax/4, Rmax/2 and Rmax frames (Rmax is more than or equal to 8); and the UE demodulates the DCI to obtain a DCI repetition number value, and then knows that a plurality of frames of PDCCH need to be transmitted later.
In an optional embodiment of the present invention, the method further comprises:
scrambling all the jointly coded 8-frame resources by using scrambling codes generated by the same initial value;
wherein an initial value c of the scrambling code sequenceinitAs shown in formula (1):
Figure BDA0001276365290000081
wherein, the subBandIndex represents the absolute sub-band index number of the sub-band where the PDCCH is located; nf is the frame number of the first effective frame in the 8 frames of the joint coding, namely the frame for transmitting the PDCCH of the asynchronous frame; if the 1 st frame in the 8-frame resources allocated to the PDCCH is a synchronous signal, nf is the frame number corresponding to the 2 nd frame, otherwise nf is the frame number corresponding to the 1 st frame;
Figure BDA0001276365290000082
indicating the cell ID.
In an alternative embodiment of the present invention, the method may further comprise the steps of:
and the base station adjusts the Rmax value by counting the ACK/NACK of the PDSCH channel fed back by the UE and informs the updated Rmax value of the UE through an RRC connection reconfiguration message.
Specifically, the ACK/NACK of the PDSCH channel fed back by the UE may reflect the quality of the downlink control channel, and then the Rmax value is adjusted according to the quality of the channel, if the channel quality is poor, the Rmax value is increased, and if the channel quality is good, the Rmax value is decreased, so as to further enhance the transmission reliability.
Fig. 4 is a flowchart illustrating a method for sending and processing a downlink control channel in another embodiment of the present invention, where an execution main body of the embodiment is a terminal UE, that is, a receiving end, and as shown in fig. 4, the method includes the following steps:
s401: and the terminal UE jointly detects the special search space according to the preset frame number and the preset PDCCH maximum repetition times.
It should be noted that, although the CSS (Cell-specific Search Space) and the USS (user-specific Search Space) may overlap from a configuration point of view, the UE does not need to receive the CSS and the USS at the same time, and may receive one of the CSS and the USS according to a state in which the UE is located.
Specifically, as shown in table 1, when the UE detects the USS, if a preset maximum number of PDCCH repetitions Rmax is not greater than 4, jointly detecting the USS according to 1 frame, 2 frames, and 4 frames; and if the preset maximum repetition times Rmax of the PDCCH is more than or equal to 8, jointly detecting the USS according to Rmax/8, Rmax/4, Rmax/2 and Rmax frames. Where Rmax is the maximum number of PDCCH repetitions, which value is configured by RRC signaling.
S402: and the UE demodulates the DCI to obtain a DCI repeated field, and determines the number of the PDCCH residual frames needing to be received according to the DCI repeated field and the PDCCH maximum repetition frequency.
Specifically, the UE demodulates the DCI to obtain a DCI repetition number value, and knows that there are several frames of PDCCHs to receive later according to the preset correspondence between the PDCCH repetition number and the DCI repetition number shown in table 1. For example, Rmax is 4, DCI repetition number is '01', and the UE demodulates the DCI in the 2 nd frame from the initial search position, and knows that there are 2 frames of PDCCH to receive. The PDCCH is transmitted according to the number of repeated transmissions specified by the Rmax value (preset PDCCH maximum number of repetitions).
S403: when the UE merges data, the UE takes 8 frames as a unit and serially merges the jointly coded 8 frames of data.
Specifically, when the sending end sends, 8 frames are taken as a Cycle, less than 8 frames, and the combined coding is carried out according to the actual frame number; if the number of the frames is more than 8, 8-frame joint coding is adopted, and repeated sending is carried out. Accordingly, the receiving end (UE) performs the tandem combining of the jointly coded 8 frame data, still taking 8 frames as a unit when combining. If the number of the received first 8 frames is larger than 8 frames, the received first 8 frames are combined with the second 8 frames to form code blocks with the same frame number, and then the received first 8 frames are combined with the third 8 frames to form code blocks with the same frame number, and so on.
In an alternative embodiment of the invention, the method further comprises the steps of:
and the UE feeds back ACK/NACK to the base station through a Physical Downlink Shared Channel (PDSCH) so that the base station can adjust a preset maximum repetition time (Rmax) value of a Physical Downlink Control Channel (PDCCH) according to the ACK/NACK, and the base station informs the updated Rmax value of the UE through an RRC connection reconfiguration message. Correspondingly, the UE obtains the updated Rmax value according to the RRC connection reconfiguration message sent by the base station.
Fig. 5 is a schematic structural diagram of a device for processing downlink control channel transmission according to an embodiment of the present invention, and as shown in fig. 5, the device includes: a framing unit 501, a first encoding unit 502, and a second encoding unit 503. Wherein:
a framing unit 501, configured to frame DCI data of a physical downlink control channel PDCCH according to a preset maximum number of repetitions of the PDCCH;
a first encoding unit 502, configured to jointly encode according to the frame number of the DCI data if the frame number of the DCI data subjected to framing processing is less than 8, and send the encoded DCI data;
a second encoding unit 503, configured to, if the number of frames of the DCI data after the framing processing is greater than or equal to 8, adopt 8-frame joint encoding, and repeatedly send the encoded DCI data with 8 frames as one cycle;
the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
In this embodiment, the framing unit 501 frames DCI data of a physical downlink control channel PDCCH according to a preset maximum number of repetitions of the PDCCH; if the frame number of the DCI data after framing is less than 8, the first coding unit 502 jointly codes according to the frame number of the DCI data and transmits the coded DCI data; if the frame number of the DCI data after framing is greater than or equal to 8, the second encoding unit 503 uses 8-frame joint encoding, and repeatedly transmits the encoded DCI data with 8 frames as one cycle. Therefore, in the embodiment, in consideration of the problem of coverage enhancement, the transmission method of the PDCCH channel is redesigned, the PDCCH is issued periodically, and a user with poor coverage can further improve the demodulation performance of the system by high repetition times, so that the coverage performance is improved, and the transmission reliability is further enhanced.
Further, the apparatus further comprises: a scrambling unit to:
scrambling all the jointly coded 8-frame resources by using scrambling codes generated by the same initial value;
wherein an initial value c of the scrambling code sequenceinitAs shown in equation one:
Figure BDA0001276365290000101
wherein, the subBandIndex represents the absolute sub-band index number of the sub-band where the PDCCH is located; nf is the frame number of the first effective frame in the 8 frames of the joint coding, namely the frame for transmitting the PDCCH of the asynchronous frame; if the 1 st frame in the 8-frame resources allocated to the PDCCH is a synchronous signal, nf is the frame number corresponding to the 2 nd frame, otherwise nf is the frame number corresponding to the 1 st frame;
Figure BDA0001276365290000102
indicating the cell ID.
In an optional embodiment of the invention, the apparatus may further comprise: an adjustment unit for:
and adjusting the Rmax value by counting ACK/NACK of the PDSCH channel fed back by the UE, and informing the updated Rmax value of the UE through an RRC connection reconfiguration message.
Fig. 6 is a schematic structural diagram of a device for processing downlink control channel transmission in another embodiment of the present invention, and as shown in fig. 6, the device includes: detection section 601, demodulation section 602, and data combining section 603. Wherein:
a detecting unit 601, configured to jointly detect a dedicated search space according to a preset frame number according to a preset PDCCH maximum repetition number;
a demodulating unit 602, configured to demodulate DCI to obtain a DCI repeat field, and determine a number of PDCCH remaining frames that need to be received according to the DCI repeat field and the PDCCH maximum repetition number;
a data merging unit 603, configured to perform serial merging on the jointly encoded 8 frame data in 8 frame units.
Specifically, the detection unit 601 is specifically configured to:
when a user-specific search space USS is detected, if the preset maximum repetition times Rmax of a PDCCH is less than or equal to 4, jointly detecting the USS according to 1 frame, 2 frames and 4 frames;
and if the preset maximum repetition times Rmax of the PDCCH is more than or equal to 8, jointly detecting the USS according to Rmax/8, Rmax/4, Rmax/2 and Rmax frames.
In an optional embodiment of the invention, the apparatus further comprises: a feedback unit to:
feeding back ACK/NACK to a base station through a Physical Downlink Shared Channel (PDSCH) so that the base station can adjust a preset maximum repetition time (Rmax) value of a Physical Downlink Control Channel (PDCCH) according to the ACK/NACK; and obtaining an updated Rmax value according to the RRC connection reconfiguration message sent by the base station.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
Fig. 7 is a block diagram of a base station according to an embodiment of the present invention.
Referring to fig. 7, the base station includes: a processor (processor)701, a memory (memory)702, a communication Interface (Communications Interface)703, and a bus 704; wherein,
the processor 701, the memory 702 and the communication interface 703 complete mutual communication through the bus 704;
the communication interface 703 is used for information transmission between the base station and a terminal UE;
the processor 701 is configured to call the program instructions in the memory 702 to execute the methods provided by the above-mentioned method embodiments, for example, including: performing framing processing on DCI data of a Physical Downlink Control Channel (PDCCH) according to a preset maximum repetition number of the PDCCH; if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data; if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as a period; the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
An embodiment of the present invention discloses a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including: performing framing processing on DCI data of a Physical Downlink Control Channel (PDCCH) according to a preset maximum repetition number of the PDCCH; if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data; if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as a period; the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
An embodiment of the present invention discloses a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to execute the methods provided by the above method embodiments, for example, the method includes: performing framing processing on DCI data of a Physical Downlink Control Channel (PDCCH) according to a preset maximum repetition number of the PDCCH; if the frame number of the DCI data after framing processing is less than 8, jointly coding according to the frame number of the DCI data, and sending the coded DCI data; if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as a period; the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
Fig. 8 is a block diagram of a terminal according to an embodiment of the present invention.
Referring to fig. 8, the terminal includes: a processor (processor)801, a memory (memory)802, a communication Interface (Communications Interface)803, and a bus 804; wherein,
the processor 801, the memory 802 and the communication interface 803 complete mutual communication through the bus 804;
the communication interface 803 is used for information transmission between the terminal and a base station;
the processor 801 is configured to call program instructions in the memory 802 to perform the methods provided by the above-described method embodiments, including for example: jointly detecting a special search space according to a preset frame number according to a preset PDCCH maximum repetition number; demodulating DCI to obtain a DCI repetition field, and determining the number of PDCCH residual frames needing to be received according to the DCI repetition field and the PDCCH maximum repetition frequency; when merging data, 8 frames of data are combined in series by using 8 frames as a unit.
An embodiment of the present invention discloses a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including: jointly detecting a special search space according to a preset frame number according to a preset PDCCH maximum repetition number; demodulating DCI to obtain a DCI repetition field, and determining the number of PDCCH residual frames needing to be received according to the DCI repetition field and the PDCCH maximum repetition frequency; when merging data, 8 frames of data are combined in series by using 8 frames as a unit.
An embodiment of the present invention discloses a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to execute the methods provided by the above method embodiments, for example, the method includes: jointly detecting a special search space according to a preset frame number according to a preset PDCCH maximum repetition number; demodulating DCI to obtain a DCI repetition field, and determining the number of PDCCH residual frames needing to be received according to the DCI repetition field and the PDCCH maximum repetition frequency; when merging data, 8 frames of data are combined in series by using 8 frames as a unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the test equipment and the like of the display device are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for processing downlink control channel transmission is characterized in that the method comprises the following steps:
performing framing processing on DCI data of a Physical Downlink Control Channel (PDCCH) according to a preset maximum repetition number m of the PDCCH; the framing processing of the DCI data of the PDCCH means that the DCI data of the PDCCH is divided into n frames; when m is less than 8, n is equal to m; when m is greater than or equal to 8, n is equal to 8;
if the frame number of the DCI data after the framing processing is less than 8, jointly coding according to the frame number of the DCI data after the framing processing, and sending the coded DCI data;
if the frame number of the DCI data subjected to framing processing is more than or equal to 8, adopting 8-frame joint coding, and repeatedly sending the coded DCI data by taking 8 frames as a period;
the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
2. The method of claim 1, wherein the PDCCH resources are increased to 13 OFDM symbols.
3. The method of claim 1, further comprising:
scrambling all the jointly coded 8-frame resources by using scrambling codes generated by the same initial value;
wherein an initial value c of the scrambling code sequenceinitAs shown in equation one:
Figure FDA0002842423080000011
wherein, the subBandIndex represents the absolute sub-band index number of the sub-band where the PDCCH is located; nf is the frame number of the first effective frame in the 8 frames of the joint coding, namely the frame for transmitting the PDCCH of the asynchronous frame; if the 1 st frame in the 8-frame resources allocated to the PDCCH is a synchronous signal, nf is the frame number corresponding to the 2 nd frame, otherwise nf is the frame number corresponding to the 1 st frame;
Figure FDA0002842423080000012
indicating the cell ID.
4. A method for processing downlink control channel transmission is characterized in that the method comprises the following steps:
the terminal UE jointly detects the special search space according to the preset frame number and the preset PDCCH maximum repetition times;
the UE demodulates the DCI to obtain a DCI repetition field, determines the DCI repetition times according to the corresponding relation between the DCI repetition field and the PDCCH maximum repetition times, and determines the PDCCH residual frame number needing to be received according to the corresponding relation between the PDCCH maximum repetition times and the DCI repetition times; the DCI repetition field is used for representing the DCI repetition times;
when merging the DCI data of the PDCCH, the UE serially merges the jointly coded DCI data of the 8-frame PDCCH by taking 8 frames as a unit.
5. The method of claim 4, wherein the jointly detecting, by the UE, the dedicated search space according to a preset frame number and a preset PDCCH maximum repetition number comprises:
when the UE detects the USS of the user-specific search space, if the maximum repetition time Rmax of a preset PDCCH is less than or equal to 4, jointly detecting the USS according to 1 frame, 2 frames and 4 frames;
and if the preset maximum repetition times Rmax of the PDCCH is more than or equal to 8, jointly detecting the USS according to Rmax/8, Rmax/4, Rmax/2 and Rmax frames.
6. The method of claim 4, further comprising:
the UE feeds back ACK/NACK to a base station through a Physical Downlink Shared Channel (PDSCH) so that the base station can adjust a preset maximum repetition time (Rmax) value of a Physical Downlink Control Channel (PDCCH) according to the ACK/NACK;
and the UE acquires an updated Rmax value according to the RRC connection reconfiguration message sent by the base station.
7. A device for processing downlink control channel transmission, the device comprising:
a framing unit, configured to frame DCI data of a PDCCH according to a preset maximum repetition number m of the PDCCH; the framing processing of the DCI data of the PDCCH means that the DCI data of the PDCCH is divided into n frames; when m is less than 8, n is equal to m; when m is greater than or equal to 8, n is equal to 8;
a first coding unit, configured to jointly code according to the frame number of the DCI data after the framing processing if the frame number of the DCI data after the framing processing is less than 8, and send the coded DCI data;
a second coding unit, configured to, if the number of frames of the DCI data subjected to framing processing is greater than or equal to 8, adopt 8-frame joint coding, and repeatedly send the coded DCI data with 8 frames as one cycle;
the number of OFDM symbols occupied by the PDCCH resource is increased by the number of OFDM symbols occupied by the PCFICH resource of the physical control format indicator channel and the number of OFDM symbols occupied by the PHICH resource of the physical hybrid automatic repeat request indicator channel.
8. The apparatus of claim 7, further comprising: a scrambling unit to:
scrambling all the jointly coded 8-frame resources by using scrambling codes generated by the same initial value;
wherein an initial value c of the scrambling code sequenceinitAs shown in equation one:
Figure FDA0002842423080000031
wherein, the subBandIndex represents the absolute sub-band index number of the sub-band where the PDCCH is located; nf is the frame number of the first effective frame in the 8 frames of the joint coding, namely the frame for transmitting the PDCCH of the asynchronous frame; if the 1 st frame in the 8-frame resources allocated to the PDCCH is a synchronous signal, nf is the frame number corresponding to the 2 nd frame, otherwise nf is the frame number corresponding to the 1 st frame;
Figure FDA0002842423080000032
indicating the cell ID.
9. A device for processing downlink control channel transmission, the device comprising:
the detection unit is used for jointly detecting the special search space according to the preset frame number and the preset PDCCH maximum repetition times;
the demodulation unit is used for demodulating DCI to obtain a DCI repetition field, determining the DCI repetition times according to the corresponding relation between the DCI repetition field and the PDCCH maximum repetition times, and determining the number of PDCCH residual frames needing to be received according to the corresponding relation between the PDCCH maximum repetition times and the DCI repetition times; the DCI repetition field is used for representing the DCI repetition times;
and a data merging unit configured to, when the UE merges the DCI data of the PDCCH, serially merge the DCI data of the jointly coded 8-frame PDCCH in 8-frame units.
10. The apparatus according to claim 9, wherein the detection unit is specifically configured to:
when a user-specific search space USS is detected, if the preset maximum repetition times Rmax of a PDCCH is less than or equal to 4, jointly detecting the USS according to 1 frame, 2 frames and 4 frames;
and if the preset maximum repetition times Rmax of the PDCCH is more than or equal to 8, jointly detecting the USS according to Rmax/8, Rmax/4, Rmax/2 and Rmax frames.
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