WO2018127139A1

WO2018127139A1 - Control information transmission method and apparatus

Info

Publication number: WO2018127139A1
Application number: PCT/CN2018/071615
Authority: WO
Inventors: 罗禾佳; 王坚; 陈莹; 李榕; 杜颖钢; 周悦; 王俊
Original assignee: 华为技术有限公司
Priority date: 2017-01-05
Filing date: 2018-01-05
Publication date: 2018-07-12
Also published as: CN108282249B; CN108282249A

Abstract

Disclosed are a control information transmission method and transmission apparatus and a corresponding communication device. In the transmission method, a network device uses an RNTI to scramble a control information bit to be coded, wherein the position of the scrambled control information bit comprises the position of a PC fixed bit set, and the length of the RNTI is greater than or equal to 16 bits. By means of the method, a network device supports a longer RNTI, and can better support the access of a massive IoT device.

Description

Method and device for transmitting control information

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting control information.

Background technique

In a wireless network communication system, when a base station schedules a terminal, the base station often identifies different terminals by using identification information, and the base station transmits control information by means of scrambling the identification information.

For example, the radio network temporary identifier (English: Radio Network Temporary Identifier, abbreviation: RNTI) is an identification information of a base station to a terminal in a Long Term Evolution (LTE) system. The existing RNTI has a length of 16 bits. As shown in Figure 1, in the encoding process of the physical downlink control channel (English: Physical Downlink Control Channel, PDCCH), the base station first circulates the downlink control information (Downlink Control Information, DCI) to be sent. Redundancy check (English: Cyclical Redundancy Check, abbreviation: CRC) encoding, get a 16-bit CRC sequence, and then the base station XOR the 16-bit RNTI information with the 16-bit CRC information (English: exclusive OR, abbreviation: XOR) operation ( That is, the scrambling operation) obtains a 16-bit CRC sequence scrambled by the RNTI, and serializes the 16-bit CRC sequence scrambled by the RNTI to the DCI information, and performs channel coding, modulation, mapping, and transmission procedures.

In the fifth-generation (5th generation, 5G) communication system and subsequent more possible communication systems, three types of scenarios are defined, namely enhanced mobile broadband (English: enhanced mobile broadband) (eMBB), ultra-reliable low-latency Communication (English: Ultra Reliable Low Latency Communications, URLLC) and large-scale Internet of Things (English: massive Machine Type Communications, abbreviation: mMTC). Among them, the eMBB service mainly includes ultra high definition video, augmented reality AR, virtual reality VR, etc. The main feature is that the transmission data volume is large and the transmission rate is high. The URLLC service is mainly used for industrial control and unmanned driving in the Internet of Things. The main features are ultra-high reliability, low latency, low transmission data and burstiness. The mMTC service is mainly used for smart grids and smart cities in the Internet of Things. The main features are the connection of mass devices, the small amount of data transmitted, and the delay of tolerating for a long time.

In the LTE standard, the maximum number of blind detections for PDCCH blind detection is dozens of times, and multiple blind detections result in high power consumption of the receiver and high reception delay. In addition, the number of terminals that can be identified by the 16-bit length RNTI is only 65536, which cannot meet the requirements of large-scale terminal access in the mMTC application scenario.

Summary of the invention

In view of this, the main object of the present invention is to provide a method and a transmission device for transmitting control information, which are used to solve the problem of large-scale terminal access in the mMTC application scenario.

In a first aspect, the present application provides a method for transmitting control information, which is applied to a wireless network, the method comprising: the network device uses a terminal identifier to scramble a control information bit to be encoded, and a location of the scrambled control information bit The location of the fixed PC set of parity PCs is included; the network device encodes the scrambled control information bits with a polar Polar code, and transmits the encoded bit sequence to the terminal.

In a second aspect, the present application provides a transmission apparatus for control information, which is applied to a wireless communication system, the apparatus comprising: a scrambling unit that scrambles control information bits to be encoded using a terminal identifier, and scrambled control information The bit position includes a position of the parity PC fixed bit set; the coding unit encodes the scrambled control information bit with a polar Polar code; and the transmitting unit transmits the encoded bit sequence to the terminal.

In a third aspect, the application provides a communication device, the device comprising:

Memory for storing programs;

a processor, configured to execute the program stored by the memory, when the program is executed, the processor uses a terminal to identify a control information bit to be encoded, and the location of the scrambled control information bit includes Parsing the location of the fixed set of bits of the PC; the processor encoding the scrambled control information bits by the network device using a polar Polar code;

A transceiver for transmitting the encoded bit sequence to other devices.

In a fourth aspect, the present application provides a method for transmitting control information, which is applied to a wireless network. The method includes: receiving, by a terminal, a bit sequence sent by a base station, where the bit sequence is a base station encoding a control information bit by using a Polar code. Obtaining; determining, by the terminal, a bit position and a value of the terminal identifier in the Polar code, where the bit position of the terminal identifier includes a parity fixed bit set; and the terminal uses the terminal identifier to determine the determined bit position Corresponding bits are descrambled to obtain the fixed bit set and the parity fixed bit set; the terminal uses the fixed bit set and the parity fixed bit set and a check equation to perform the bit sequence Decoding to obtain an information bit set, the information bit set including downlink control information DCI and a cyclic redundancy check CRC sequence; the terminal uses the terminal identifier to descramble the CRC sequence in the information bit set and The terminal performs a CRC check on the DCI, and if the CRC check passes, the DCI is obtained.

In a fifth aspect, the application provides a transmission device for controlling information, which is applied to a wireless communication system, the device includes: an acquiring unit, configured to receive a bit sequence sent by a base station, where the bit sequence is controlled by a base station by using a Polar code pair The information bit is obtained by encoding; the determining unit is configured to determine a bit position and a value of the terminal identifier in the Polar code, the bit position of the terminal identifier includes a parity fixed bit set, and a descrambling unit, configured to use the Determining, by the terminal identifier, bits corresponding to the determined bit position, acquiring the fixed bit set and the parity fixed bit set, and using the terminal identifier to solve a CRC sequence in the information bit set a decoding unit, configured to decode the bit sequence by using the fixed bit set and the parity fixed bit set and a check equation to obtain an information bit set, where the information bit set includes downlink control information DCI and cyclic redundancy check CRC sequence; a check unit for performing CRC check on the DCI, if the CRC check passes Get DCI.

In a sixth aspect, the application provides a communication device, where the device includes:

The transceiver is configured to receive a bit sequence sent by the base station, where the bit sequence is used by the base station to encode the control information bit by using a Polar code, and then the bit sequence obtained by the coding is sent to another device.

Memory for storing programs;

a processor, configured to execute the program stored by the memory, when the program is executed, the processor determines a bit position and a value of a terminal identifier in the Polar code, where a bit position of the terminal identifier includes a parity Verifying a fixed set of bits; the processor descrambling the bits corresponding to the determined bit position using the terminal identifier to obtain the fixed bit set and the parity fixed bit set; The fixed bit set and the parity fixed bit set and the check equation decode the bit sequence to obtain an information bit set, where the information bit set includes downlink control information DCI and cyclic redundancy check CRC sequence The processor uses the terminal identifier to descramble the CRC sequence in the information bit set and the terminal performs a CRC check on the DCI, and if the CRC check passes, the DCI is obtained. The transceiver 401, the memory 402, and the processor 403 are connected by a bus 404.

In combination with all of the above, in one possible design, the location of the scrambled control information bits further includes at least one portion: a location of the cyclic redundancy check CRC sequence, and a location of the fixed set of bits.

In combination with all the above aspects, in a possible design, the terminal identifier is a radio network temporary identifier RNTI, and the length of the RNTI is greater than or equal to 16 bits.

With reference to all the above aspects, in a possible design, the control information bits to be encoded include a set of information bits, where the information bit set includes downlink control information DCI and the CRC sequence, and the CRC sequence is The DCI is obtained using CRC coding.

In the present application, the network device uses the RNTI to encode the control information bits to be scrambled. The location of the scrambled control information bits includes the location of the PC fixed bit set, the location of the CRC sequence, and the location of the fixed bit set, and the length of the RNTI is greater than Or equal to 16 digits. The application also describes carrying the RNTI through the initial value of the register. In the above manner, the network device supports a longer RNTI, which can better support the access of large-scale IoT devices.

DRAWINGS

FIG. 1 is a process of PDCCH blind detection in the LTE standard.

2 is a basic flow chart of wireless communication.

FIG. 3 is a schematic diagram of an application scenario according to an embodiment of the present application.

FIG. 4 is an example of the construction of a Polar code.

Fig. 5 is a configuration example of a PC-Polar code.

Figure 6 is a schematic diagram of a shift register of a PC-Polar code.

FIG. 7 is a flowchart of a method for transmitting control information according to the present application.

FIG. 8 is a structural diagram of a control information transmission apparatus of the present application.

FIG. 9 is a first exemplary diagram of a scrambling process in a control information transmission method of the present application.

FIG. 10 is a second exemplary diagram of a scrambling process in the control information transmission method of the present application.

FIG. 11 is a third exemplary diagram of a scrambling process in the control information transmission method of the present application.

FIG. 12 is a fourth exemplary diagram of a scrambling process in the control information transmission method of the present application.

FIG. 13 is a fifth exemplary diagram of a scrambling process in the control information transmission method of the present application.

FIG. 14 is a diagram showing an example of register operations in the control information transmission method of the present application.

FIG. 15 is a structural diagram of a communication device for controlling information transmission according to the present application.

FIG. 16 is a flowchart of another method for transmitting control information according to the present application.

Figure 17 is a structural diagram of another control information transmission apparatus of the present application.

Figure 18 is a flow chart showing the improvement of the decoding of the present application.

Figure 19 is a simulation diagram of the decoding improvement of the present application.

detailed description

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

2 is a basic flow of wireless communication. At the transmitting end, the source is sequentially transmitted after source coding, channel coding, rate matching, and digital modulation. At the receiving end, the information is outputted by digital demodulation, de-rate matching, channel decoding, and source decoding. The channel codec can use a Polar code. Since the code length of the original Polar code (parent code) is an integer power of 2, in practical applications, a Polar code of arbitrary code length needs to be implemented by rate matching. As shown in FIG. 2, the sender performs rate matching after channel coding to implement an arbitrary target code length, and performs de-rate matching on the receiving end before channel decoding.

The embodiments of the present application can be applied to a wireless communication system, where a wireless communication system usually consists of a cell, each cell includes a base station (English: Base Station, BS for short), and the base station transmits to multiple mobile stations (English: Mobile Station, referred to as: MS) provides communication services in which the base station is connected to the core network device, as shown in FIG.

It should be noted that the wireless communication system mentioned in the embodiments of the present application includes, but is not limited to, a narrowband Internet of Things system (English: Narrow Band-Internet of Things, referred to as NB-IoT), and a global mobile communication system (English: Global System) For Mobile Communications (GSM), Enhanced Data Rate for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (English: Code Division Multiple Access, CDMA2000 for short), Time Division-Synchronization Code Division Multiple Access (TD-SCDMA), Long Term Evolution ( English: Long Term Evolution (LTE) and the three major application scenarios of next-generation 5G mobile communication systems, eMBB, URLLC and eMTC.

In the embodiment of the present application, the base station is a device deployed in a radio access network to provide a wireless communication function for the UE. The base station may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. In a system using different radio access technologies, the name of a device having a base station function may be different, for example, in an LTE system, an evolved Node B (evolved NodeB, eNB or eNodeB), in the third In the system (English: 3rd Generation, 3G for short), it is called Node B (English: Node B). For convenience of description, in all embodiments of the present application, the foregoing apparatus for providing a wireless communication function to a UE is collectively referred to as a base station or a BS.

The MSs involved in the embodiments of the present application may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. The MS may also be referred to as a terminal (English: terminal), and may also include a subscriber unit (English: subscriber unit), a cellular phone (English: cellular phone), a smart phone (English: smart phone), a wireless data card, and a personal number. Assistant (English: Personal Digital Assistant, PDA for short) computer, tablet computer, wireless modem (English: modem), handheld device (English: handset), laptop (English: laptop computer), machine type communication (English) :Machine Type Communication, referred to as: MTC) terminal. For convenience of description, in all embodiments of the present application, the above-mentioned devices are collectively referred to as an MS.

At the 87th meeting of 3GPP (English: 3rd Generation Partnership Project) RAN1 (English: Radio Access Network, Chinese: Radio Access Network), the polar Polar code was officially received as 5G eMBB. :enhanced Mobile Broadband) The channel coding scheme of the uplink and downlink control channels of the scenario.

The following is a brief introduction to the Polar code.

Communication systems usually use channel coding to improve the reliability of data transmission to ensure the quality of communication. The Polar code proposed by Turkish professor Arikan is the first code that theoretically proves to achieve Shannon capacity and has low coding and decoding complexity. The Polar code is also a linear block code whose encoding matrix is G _N and the encoding process is

among them

Is a binary line vector of length N (ie code length); G _N is an N × N matrix, and

Defined as the Kronecker product of log ₂ N matrices F ₂ . Above matrix

During the encoding of the Polar code,

A part of the bits are used to carry information, called a set of information bits, and the set of indexes of these bits is recorded as

The other part of the bits is set to a fixed value pre-agreed by the transceiver, which is called a fixed bit set or a frozen bit set.

Complement

Said. The encoding process of the Polar code is equivalent to:

Here, G _N. (A) is the set of G _N.

The sub-matrices obtained from those rows corresponding to the index, G _N. (A ^C ) is the set of G _N.

The sub-matrices obtained from those rows corresponding to the index.

for

The set of information bits in the quantity, K;

for

A fixed set of bits in the number (NK) that is a known bit. These fixed bits are usually set to 0, but the fixed bits can be arbitrarily set as long as the transceiver end pre-agreed. Thus, the encoded output of the Polar code can be simplified to:

Here

for

a collection of information bits,

a row vector of length K, ie

|·| indicates the number of elements in the collection, and K is the size of the information block.

Is the matrix G _N by the set

The submatrices obtained from the rows corresponding to the index,

Is a K × N matrix.

The construction process of the Polar code is a collection

The selection process determines the performance of the Polar code. The construction process of the Polar code is generally: determining that there are N polarized channels in total according to the length N of the mother code, respectively corresponding to N rows of the coding matrix, calculating the reliability of the polarized channel, and the first K polarizations with higher reliability. Channel index as a collection

Element, the index corresponding to the remaining (NK) polarized channels as the index set of fixed bits

Elements. set

Determine the location of the information bits, the collection

The position of the fixed bit is determined.

It can be seen from the coding matrix that the original Polar code (parent code) has a code length of 2, which is an integer power of 2, and in practice, a Polar code of arbitrary code length needs to be implemented by rate matching.

4 is a configuration example of a Polar code in which {u1, u2, u3, u5} is set as a fixed bit set, and {u4, u6, u7, u8} is set as an information bit set, and information having a length of 4 is set. The 4-bit information bits in the vector are encoded into 8-bit coded bits.

PC-Polar is a Polar code that introduces parity (English: Parity Check, PC for short). PC-Polar introduces parity bits in the vector to be encoded. Figure 5 shows an example of a PC-Polar of 8x8. It can be seen that the fifth bit to be encoded is the copy of the fourth bit to be encoded. In PC-Polar, the value of the PC fixed bit set is a function of the information bit whose sequence number is smaller than the PC fixed bit set, and copying is a special case.

A shift register is introduced in the existing PC-Polar scheme to generate the value of the PC fixed bit set, as shown in FIG. First initialize a register of a specific length, as shown on the left side of Figure 6, when the information bits are encountered, put the value of the information bits into the register. As shown on the right side of Figure 6, when a set of PC fixed bits is encountered, the value in the register is read and placed in the encoding position of the set of fixed bits of the PC.

It should be noted that the Polar code mentioned in this application is a PC-Polar code.

The present application provides a control information transmission method, and the method can be applied to a network device, such as the base station in FIG. 3 or a baseband processing unit (English: Baseband Unit, BBU for short). FIG. 7 is a flowchart of the control information transmission method, and the specific steps are as follows:

Step 210: The network device uses the terminal identifier to scramble the control information bits to be encoded, and the location of the scrambled control information bits includes the location of the parity PC fixed bit set.

Optionally, the location of the scrambled control information bits further includes at least one of: a location of a cyclic redundancy check CRC sequence, and a location of the fixed set of bits.

Step 220: The network device encodes the scrambled control information bits by using a polar Polar code, and sends the encoded bit sequence to the terminal.

It should be noted that the control information transmission apparatus 300 shown in FIG. 8 can implement the processes of LDPC encoding and transmission in steps 210-220. The scrambling unit 310 is configured to perform step 210, the encoding unit 320 is configured to perform the encoding process in step 220, and the sending unit 330 is configured to perform the process of transmitting the encoded bit sequence in step 220. The control information transmission device is, for example, a base station, and the control information transmission device may be an application specific integrated circuit (ASIC: ASIC) or a chip that implements related functions.

Steps 210 to 220 will be described below with reference to FIG. 9. FIG. 9 shows a control information bit (to be coded vector) to be encoded by Polar, including an information bit set, a PC fixed bit set, and a fixed bit set. The information bit set includes downlink control information DCI and a CRC sequence, and the CRC sequence is obtained by DCI using CRC coding, and the CRC sequence has a length of 16 bits.

The terminal identifier in step 210 is a radio network temporary identifier RNTI. It should be noted that the LTE standard specifies that the length of the RNTI is 16 bits. In the 5G communication system, the length of the RNTI is not yet defined. In this application, the length of the RNTI is set to be greater than or equal to 16 bits. For example, the RNTI has a length of 20 bits and can identify up to 1,048,576 different terminals. Therefore, when the RNTI length is greater than 16 bits, it can identify hundreds of thousands or even millions of terminals at the same time, which can meet the requirements of accessing massive IoT devices in the 5G network eMTC scenario.

It should be noted that the location of the scrambled control information bits in step 210 includes the following implementations.

Embodiment 1: The scrambled position is the position of the CRC sequence and the position of the PC fixed bit set and the position of the fixed bit set.

The network device performs the Polar encoding after scrambling the position of the CRC sequence in the control information bits to be encoded by the RNTI and the position of the fixed bit set of the PC and the position of the fixed bit set. As shown in FIG. 9, it is assumed that the length of the RNTI is k bits, and k>16, wherein the first 16 bits of the RNTI are scrambled at the position of the CRC sequence in the control information bits to be encoded, and the remaining part of the RNTI is to be encoded in the control information bits. The position of the PC fixed bit set and the position of the fixed bit set are scrambled.

It should be noted that the three scrambling sequences for the location of the CRC sequence, the location of the PC fixed bit set, and the location of the fixed bit set may be three mutually different subsets of the RNTI. The three scrambling sequences may also have repeated bit information as long as the sum of the three scrambling sequences is satisfied to include all the bit information of the RNTI.

Embodiment 2: The scrambled position is the position of the PC fixed bit set.

The network device scrambles the PC fixed bit set in the control information bits to be encoded by the RNTI, and then performs Polar coding. As shown in FIG. 10, the information bit set length is k, the PC fixed bit set length is m-k, and the fixed bit set length is n-m. It is assumed that the length of the RNTI is 18 bits and m-k>18. The 18-bit RNTI with high reliability in the PC fixed bit set is selected to be scrambled. It should be noted that the reliability of the PC fixed bit set close to the information bit set is high.

Embodiment 3: The scrambled position is the position of the CRC sequence and the position of the PC fixed bit set.

As shown in FIG. 11, the information bit set length is k, the PC fixed bit set length is m-k, and the fixed bit set length is n-m. The network device scrambles a portion of the RNTI to the location of the PC fixed bit set of the control information bits to be encoded, and the base station scrambles the remaining portion of the RNTI to the position of the CRC sequence of the control information bits to be encoded with the length of the RNTI being 18 bits. For example, the network device scrambles the upper 2 bits of the RNTI to the location of the PC fixed bit set, and the remaining 16 bits of the RNTI are scrambled to the location of the CRC sequence.

It should be noted that the location of the CRC sequence and the location of the PC fixed bit set may be two mutually different subsets of the RNTI. The two scrambling sequences may also have repeated bit information as long as the union of the two scrambling sequences is satisfied to contain all the bit information of the RNTI.

Optionally, the network device processes the RNTI part content by using a specific function and then scrambles the location of the PC fixed bit set of the control information bit to be encoded. As shown in FIG. 12, taking the length of the RNTI 18 bits as an example, the RNTI is used. After the high 2 bits are repeated 3 times, 6 bits are obtained, 6 bits are scrambled to the position of the PC fixed bit set, and the remaining 16 bits in the RNTI are scrambled to the position of the CRC sequence.

Embodiment 4: The scrambled position is the position of the PC fixed bit set and the position of the fixed bit set.

The network device scrambles a portion of the RNTI to the location of the set of PC fixed bits of the control information bits to be encoded, and the base station scrambles the remainder of the RNTI to the location of the fixed set of bits of control information bits to be encoded. Taking the length 18 bits of the RNTI as an example, the base station scrambles the upper 2 bits of the RNTI to the position of the fixed bit set of the PC, and the remaining 16 bits of the RNTI are scrambled to the position of the fixed bit set.

Optionally, the network device processes the RNTI part content by using a specific function and then scrambles the location of the PC fixed bit set of the control information bit to be encoded. As shown in FIG. 12, taking the length of the RNTI 18 bits as an example, the RNTI is used. After the high 2 bits are repeated 3 times, 6 bits are obtained, 6 bits are scrambled to the position of the PC fixed bit set, and the remaining 16 bits in the RNTI are scrambled to the position of the fixed bit set.

It should be noted that the location of the fixed bit set sequence and the location of the PC fixed bit set may be two mutually different subsets of the RNTI. The two scrambling sequences may also have repeated bit information as long as the union of the two scrambling sequences is satisfied to contain all the bit information of the RNTI.

It should be noted that the foregoing scrambling includes direct exclusive OR of the RNTI, and the RNTI directly or differently superimposes the terminal side antenna selection information, and generates a scrambling sequence by using the RNTI as a random number seed. The example shows that the RNTI generates a scrambling sequence as a random number seed, and uses a 16-bit RNTI as a random number seed to generate a scrambling sequence of 300 bits in length, 300 bits being the length of the PC fixed bit set and the fixed bit set.

It should be noted that the network device in this application may also carry the RNTI through the initial value of the register.

Specifically, the base station carries the divergent subset of the RNTIs by the CRC of the control information bits to be encoded, the PC fixed bit set, the fixed bit set, and the initial value of the register. Figure 13 shows an example, assuming that the total length of the RNTI is k, where k > 16. The first 16 bits of the RNTI are scrambled to the CRC sequence, the 17-21th bit is carried by the initial value of the register, and the remaining (k-21) bits are scrambled to the fixed bit set and the PC fixed bit set.

It should be noted that the RNTI is carried by the initial value of the register, and the following embodiments are also included.

Embodiment 1: RNTI is all carried by the initial value of the register

As shown in FIG. 14, the RNTI has a length of p and a register width of p, and can be encoded by the RNTI as an initial value of the register.

Embodiment 2: RNTI part is carried by a specific function by a register initial value

The network device repeats the partial bits of the RNTI to obtain a repeated bit sequence, and encodes the repeated bit sequence as a register initial value.

As shown in FIG. 15, the present application also provides a communication device 400 that can transmit control information. The communication device 400 includes:

a memory 402, configured to store a program;

a processor 403, configured to execute the program stored by the memory, when the program is executed, the processor uses a terminal to identify a control information bit to be encoded, and a position of the scrambled control information bit A location including a set of parity PC fixed bits; the processor encoding the scrambled control information bits to the network device using a polar Polar code.

The transceiver 401 is configured to send the encoded bit sequence to other devices.

The transceiver 401, the memory 402, and the processor 403 are connected by a bus 404.

It should be noted that the method performed by the processor is consistent with the foregoing, and details are not described herein.

In the present application, the network device uses the RNTI to encode the control information bits to be scrambled. The location of the scrambled control information bits includes the location of the PC fixed bit set, the location of the CRC sequence, and the location of the fixed bit set, and the length of the RNTI. Greater than or equal to 16 digits. The application also describes carrying the RNTI through the initial value of the register. In the above manner, the network device supports a longer RNTI, which can better support the access of large-scale IoT devices.

The present application also provides a control information transmission method, which can be applied to a terminal, for example, MS1-MS2 in FIG. Figure 16 is a flow chart of the control information transmission method, the specific steps are as follows:

Step 510: The terminal receives a bit sequence sent by the base station, where the bit sequence is obtained by the base station encoding the control information bits by using a Polar code.

It should be noted that, in view of the decoding characteristics of the Polar code, the present application also improves the flow before the step 310, and the flowchart is as shown in FIG. 18. Before blind detection, first perform at least two SC (English: Successive Cancelling) decoding for each potential DCI position, and record the corresponding PM (English: Path Metric, Chinese: Path Metric) value. The smaller the absolute value of PM, the higher the probability that the path is decoded correctly. The PM is a decoding metric that scrambles the fixed bits using the RNTI of the MS itself, and the PM _inv is a decoding metric that uses the RNTI of the MS itself to inverse the scrambled fixed bits, and the PM0 is a translation using the all-0 scrambled fixed bits. Code metric, PM1 is a decoding metric that uses all 1 scrambled fixed bits, and a new metric is obtained based on these several decoding metrics. Illustratively, metric=PM/(PM0+PM1), DCI potential location There are 44, and SC decoding is performed for 44 potential DCI positions, and 44 metrics of potential DCI positions are obtained, and 44 metrics are sorted from small to large.

Step 520: The terminal determines a bit position and a value of the terminal identifier in the Polar code, where the bit position of the terminal identifier includes a parity fixed bit set.

Optionally, the bit position of the terminal identifier further includes: a location of the cyclic redundancy check CRC sequence, and a location of the fixed bit set.

Step 530: The terminal uses the terminal identifier to descramble the bit corresponding to the determined bit position to obtain the fixed bit set and the parity fixed bit set.

Step 540: The terminal decodes the bit sequence by using the fixed bit set and the parity fixed bit set and a check equation to obtain an information bit set, where the information bit set includes downlink control information DCI and Cyclic Redundancy Check CRC sequence.

Step 550: The terminal uses the terminal identifier to descramble the CRC sequence in the information bit set, and the terminal performs a CRC check on the DCI. If the CRC check passes, the DCI is obtained.

It should be noted that the control information transmission device 600 shown in FIG. 17 can implement the processes of step 510 to step 550. The obtaining unit 610 is configured to perform step 510, the determining unit 620 is configured to perform step 520, the descrambling unit 630 is configured to perform the descrambling process in step 530 and step 550, and the verifying unit 640 is configured to perform the calibration in step 550. The decoding unit 650 is configured to perform step 540. The control information transmission device is, for example, a site or a user terminal, and the control information transmission device may be an application specific integrated circuit (ASIC) or a chip that implements related functions.

It should be noted that the decoding process in step 350 is similar to the process of blindly detecting the PDCCH in the existing LTE. During the terminal PDCCH blind detection process, the terminal performs blind detection on the potential DCI position according to the metric sorting information until the CRC check passes.

FIG. 19 is a simulation diagram showing the statistical distribution of the actual number of blind detections at the block error rate BLER=0.01 after sorting. It can be seen that almost all decoding is detected for the first time. This program reduces the average number of blind checks.

Optionally, the terminal identifier is a radio network temporary identifier RNTI, and the length of the RNTI is greater than or equal to 16 bits.

In the Polar code decoding process, different operations are performed for the information bit set and the fixed bit set (including the fixed bit set and the PC fixed bit set).

The terminal determines the bit position and value of the terminal identifier in the Polar code in step 320. As can be seen from the foregoing description, the bit position of the terminal identifier in the Polar code includes multiple implementation manners. Therefore, the decoding side of the terminal also includes multiple implementation manners.

Case 1: RNTI is all scrambled to the PC fixed bit set

When the terminal decodes, the fixed bit of the PC is descrambled and decoded by using the RNTI allocated by the base station. If the decoding result passes the CRC check, it indicates that the fixed bit is found and correctly decoded.

Case 2: The RNTI part (eg, the upper 2 bits) is scrambled to the PC fixed bit set position, and the remaining part of the RNTI is scrambled to the fixed bit set position or the CRC sequence position

When decoding the terminal, the high-order 2 bits of the RNTI allocated by the base station are used to descramble and decode the fixed bit set of the PC, and the CRC sequence or the fixed bit set is descrambled by using the remaining part of the RNTI, if the decoding result passes the CRC check. , indicating that the PDCCH is found and correctly decoded.

Case 3: RNTI is carried by the initial value of the register

When the terminal decodes, the initial value of the register is descrambled and decoded by the RNTI allocated by the base station. If the decoding result passes the CRC check, it indicates that the initial value is found and correctly decoded.

It should be noted that the descrambling operation in the present application includes an exclusive OR operation, and therefore the descrambling operation involved in the present application has the same effect as the scrambling operation.

The communication device 400 is as shown in FIG. The communication device 400 includes:

The transceiver 401 is configured to receive a bit sequence sent by the base station, where the bit sequence is used by the base station to encode the control information bit by using a Polar code, and then the bit sequence obtained by the coding is sent to another device.

a memory 402, configured to store a program;

a processor 403, configured to execute the program stored by the memory, when the program is executed, the processor determines a bit position and a value of a terminal identifier in the Polar code, where a bit position of the terminal identifier includes a parity fixed bit set; the processor descrambles the bit corresponding to the determined bit position using the terminal identifier to obtain the fixed bit set and the parity fixed bit set; the processor Decoding the bit sequence using the fixed set of bits and the parity fixed bit set and check equation to obtain a set of information bits, the set of information bits including downlink control information DCI and cyclic redundancy check CRC The processor uses the terminal identifier to descramble the CRC sequence in the information bit set and the terminal performs a CRC check on the DCI, and if the CRC check passes, the DCI is obtained. The transceiver 401, the memory 402, and the processor 403 are connected by a bus 404.

In the embodiment of the present application, the terminal performs SC decoding on the potential DCI position before the PDCCH blind detection starts, obtains the PM value of each potential location, and sorts the PM values of each potential location. In the above manner, the terminal can improve the probability of correct decoding during the PDCCH blind detection process, and reduce the number of blind detection searches.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical storage medium (eg, a DVD), or the like.

Claims

A method for transmitting control information, applied to a wireless network, comprising:

The network device uses the terminal identifier to scramble the control information bits to be encoded, and the location of the scrambled control information bits includes the location of the parity PC fixed bit set;

The network device encodes the scrambled control information bits by using a polar Polar code, and sends the encoded bit sequence to the terminal.
The method of claim 1 wherein the location of the scrambled control information bits further comprises at least one of: a location of a cyclic redundancy check CRC sequence, and a location of the fixed set of bits.
The method according to claim 1 or 2, wherein the terminal identifier is a radio network temporary identifier RNTI, and the length of the RNTI is greater than or equal to 16 bits.
The method according to any one of claims 1-3, wherein the control information bits to be encoded comprise a set of information bits, the set of information bits comprising downlink control information DCI and the CRC sequence, the CRC The sequence is obtained by the DCI using CRC coding.
A transmission device for controlling information, which is applied to a wireless communication system, comprising:

The scrambling unit scrambles the control information bits to be encoded using the terminal identifier, and the location of the scrambled control information bits includes the location of the parity PC fixed bit set;

a coding unit that encodes the scrambled control information bits by using a polar Polar code;

The sending unit sends the encoded bit sequence to the terminal.
The encoding apparatus according to claim 5, wherein the position of the scrambled control information bits further comprises at least one of: a position of a cyclic redundancy check CRC sequence, and a position of the fixed bit set.
The encoding apparatus according to claim 5 or 6, wherein the terminal identifier is a radio network temporary identifier RNTI, and the length of the RNTI is greater than or equal to 16 bits.
The encoding apparatus according to any one of claims 5-7, wherein the control information bits to be encoded comprise a set of information bits, the information bit set includes downlink control information DCI and the CRC sequence, The CRC sequence is obtained by the DCI using CRC coding.
A communication device, comprising:

Memory for storing programs;

a processor, configured to execute the program stored by the memory, when the program is executed, the processor uses a terminal to identify a control information bit to be encoded, and the location of the scrambled control information bit includes Parsing the location of the fixed set of bits of the PC; the processor encoding the scrambled control information bits by the network device using a polar Polar code;

A transceiver for transmitting the encoded bit sequence to other devices.
The communication device of claim 9, wherein the location of the scrambled control information bits further comprises at least one portion: a location of the cyclic redundancy check CRC sequence, and a location of the fixed set of bits.