CN108282249B

CN108282249B - Control information transmission method and device

Info

Publication number: CN108282249B
Application number: CN201710008435.4A
Authority: CN
Inventors: 罗禾佳; 王坚; 陈莹; 李榕; 杜颖钢; 周悦; 王俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-01-05
Filing date: 2017-01-05
Publication date: 2021-02-23
Anticipated expiration: 2037-01-05
Also published as: CN108282249A; WO2018127139A1

Abstract

The application discloses a transmission method and a transmission device of control information and corresponding communication equipment, wherein network equipment uses RNTI to scramble control information bits to be coded, the positions of the scrambled control information bits comprise the positions of a PC fixed bit set, and the length of the RNTI is greater than or equal to 16 bits. By the mode, the network equipment supports longer RNTI and can better support the access of large-scale Internet of things equipment.

Description

Control information transmission method and device

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

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

For example, a Radio Network Temporary Identifier (RNTI) is identification information of a base station to a terminal in a Long Term Evolution (LTE) system. The length of the existing RNTI is 16 bits. As shown in fig. 1, in the coding process of a Physical Downlink Control Channel (PDCCH), a base station first performs Cyclic Redundancy Check (CRC) coding on Downlink Control Information (DCI) to be transmitted to obtain a 16-bit CRC sequence, then performs exclusive OR (XOR) operation (also called scrambling operation) on the 16-bit RNTI Information and the 16-bit CRC Information to obtain a 16-bit CRC sequence scrambled by the RNTI, concatenates the 16-bit CRC sequence scrambled by the RNTI to the above-mentioned Information, and performs Channel coding, modulation, mapping and transmission processes on the DCI.

Three broad categories of scenarios are defined in the 5th Generation (5G) communication system and more subsequent communication systems, namely enhanced Mobile Broadband (eMBB), Ultra-Reliable Low Latency Communications (URLLC), and large-scale internet of things Communications (mtc). The eMBB service mainly comprises ultra-high-definition video, augmented reality AR, virtual reality VR and the like, and is mainly characterized by large transmission data volume and high transmission rate. The URLLC business is mainly used for industrial control, unmanned driving and the like in the Internet of things, and is mainly characterized by ultrahigh reliability, low time delay, less transmission data volume and burstiness. The mMTC service is mainly used for smart power grids, smart cities and the like in the Internet of things, and is mainly characterized by mass equipment connection, small data transmission amount and longer time delay tolerance.

The maximum blind detection times of PDCCH blind detection specified in the LTE standard reach dozens of times, and the receiver of the terminal has large power consumption and high receiving time delay caused by multiple times of blind detection. In addition, the number of terminals that can be identified by the RNTI with the length of 16bits is only 65536, and the requirement of large-scale terminal access in the mtc application scenario cannot be met.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a method and a device for transmitting control information, which are used to solve the requirement of large-scale terminal access in an mtc application scenario.

In a first aspect, the present application provides a method for transmitting control information, which is applied in a wireless network, and the method includes: the network equipment scrambles the control information bits to be coded by using the terminal identification, and the positions of the scrambled control information bits comprise the positions of the parity check PC fixed bit sets; and the network equipment encodes the scrambled control information bits by adopting a Polar code and sends a bit sequence obtained by encoding to the terminal.

In a second aspect, the present application provides an apparatus for transmitting control information, which is applied in a wireless communication system, and includes: the scrambling unit scrambles the control information bits to be coded by using the terminal identification, and the positions of the scrambled control information bits comprise the positions of the parity check PC fixed bit sets; the coding unit is used for coding the scrambled control information bits by adopting a polarity Polar code; and a transmitting unit for transmitting the encoded bit sequence to the terminal.

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

a memory for storing a program;

a processor for executing the program stored in the memory, the processor scrambling control information bits to be encoded using a terminal identification when the program is executed, the locations of the scrambled control information bits comprising the locations of a set of parity PC fixed bits; the processor encodes the scrambled control information bits by adopting a Polar code to the network equipment;

and the transceiver is used for transmitting the coded bit sequence to other equipment.

In a fourth aspect, the present application provides a method for transmitting control information, which is applied in a wireless network, and the method includes: a terminal receives a bit sequence sent by a base station, wherein the bit sequence is obtained by the base station by coding control information bits by adopting Polar codes; the terminal determines the bit position and the value of a terminal identifier in the Polar code, wherein the bit position of the terminal identifier comprises a parity check fixed bit set; the terminal uses the terminal identification to descramble the bits corresponding to the determined bit positions to obtain the fixed bit set and the parity check fixed bit set; the terminal decodes the bit sequence by using the fixed bit set, the parity check fixed bit set and a check equation to obtain an information bit set, wherein the information bit set comprises Downlink Control Information (DCI) and a Cyclic Redundancy Check (CRC) sequence; and the terminal descrambles the CRC sequence in the information bit set by using the terminal identification, and the terminal performs CRC check on the DCI, and if the CRC check is passed, the DCI is obtained.

In a fifth aspect, the present application provides an apparatus for transmitting control information, which is applied in a wireless communication system, and the apparatus includes: the base station comprises an acquisition unit, a decoding unit and a decoding unit, wherein the acquisition unit is used for receiving a bit sequence sent by the base station, and the bit sequence is obtained by the base station after coding control information bits by adopting Polar codes; a determining unit, configured to determine a bit position and a value of a terminal identifier in the Polar code, where the bit position of the terminal identifier includes a parity check fixed bit set; a descrambling unit, configured to descramble the bits corresponding to the determined bit positions by using the terminal identifier to obtain the fixed bit set and the parity fixed bit set, and descramble the CRC sequence in the information bit set by using the terminal identifier; a decoding unit, configured to decode the bit sequence by using the fixed bit set and the parity check fixed bit set and a check equation to obtain an information bit set, where the information bit set includes a downlink control information DCI and a cyclic redundancy check CRC sequence; and the checking unit is used for performing CRC (cyclic redundancy check) on the DCI, and if the CRC passes, the DCI is obtained.

In a sixth aspect, the present application provides a communication device, comprising:

and the transceiver is used for receiving a bit sequence sent by the base station, wherein the bit sequence is obtained by coding the control information bits by the base station by adopting Polar codes and then sending the coded bit sequence to other equipment.

A memory for storing a program;

a processor for executing said program stored in said memory, said processor determining bit positions and values of terminal identities in said Polar codes when said program is executed, said terminal identities bit positions comprising a set of parity fixed bits; the processor uses the terminal identification to descramble the bits corresponding to the determined bit positions to obtain the fixed bit set and the parity check fixed bit set; the processor decodes the bit sequence by using the fixed bit set, the parity check fixed bit set and a check equation to obtain an information bit set, wherein the information bit set comprises Downlink Control Information (DCI) and a Cyclic Redundancy Check (CRC) sequence; and the processor descrambles the CRC sequence in the information bit set by using the terminal identification, and the terminal performs CRC check on the DCI, and if the CRC check is passed, the DCI is obtained. The transceiver, the memory and the processor are connected through a bus.

In combination with all of the above aspects, in one possible design, the positions of the scrambled control information bits further include at least one of: the position of the cyclic redundancy check, CRC, sequence, and the position of the fixed set of bits.

With reference to 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 coded include an information bit set, where the information bit set includes downlink control information DCI and the CRC sequence, and the CRC sequence is obtained by using CRC coding on the DCI.

In the application, the network device scrambles the control information bits to be coded by using the RNTI, the positions of the scrambled control information bits comprise the positions of a PC fixed bit set, a CRC sequence and the positions of the fixed bit set, and the length of the RNTI is greater than or equal to 16 bits. This application also introduces carrying the RNTI by the initial value of the register. By the mode, the network equipment supports longer RNTI and can better support the access of large-scale Internet of things equipment.

Drawings

Fig. 1 shows a PDCCH blind detection process in the LTE standard.

Fig. 2 is a basic flow diagram of wireless communication.

Fig. 3 is an application scenario diagram according to an embodiment of the present application.

FIG. 4 is a configuration example of Polar code.

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

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

Fig. 7 is a flowchart of a control information transmission method according to the present application.

Fig. 8 is a structural diagram of the control information transmission device according to the present application.

Fig. 9 is a diagram illustrating a first example of a scrambling procedure in the control information transmission method according to the present application.

Fig. 10 is a diagram illustrating a second example of a scrambling procedure in the control information transmission method according to the present application.

Fig. 11 is a diagram illustrating a third example of a scrambling procedure in the control information transmission method according to the present application.

Fig. 12 is a diagram illustrating a fourth example of a scrambling procedure in the control information transmission method according to the present application.

Fig. 13 is a diagram illustrating a fifth example of a scrambling procedure in the control information transmission method according to the present application.

Fig. 14 is a diagram illustrating an example of register operations in the control information transfer method according to the present application.

Fig. 15 is a block diagram of a communication device that controls information transmission according to the present application.

Fig. 16 is a flowchart of another control information transmission method according to the present application.

Fig. 17 is a structural diagram of another control information transmission apparatus according to the present application.

Fig. 18 is a flow chart of the coding improvement of the present application.

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

Detailed Description

The following describes in further detail specific embodiments of the present invention with reference to the accompanying drawings.

Fig. 2 is a basic flow of wireless communication, in which at a transmitting end, a source is sequentially subjected to source coding, channel coding, rate matching, and digital modulation, and then transmitted. And at a receiving end, outputting an information sink through digital demodulation, rate de-matching, channel decoding and information source decoding in sequence. The channel coding and decoding can adopt Polar codes, and the code length of the original Polar codes (mother codes) is an integral power of 2, so that the Polar codes with any code length can be realized through rate matching in practical application. As shown in fig. 2, the transmitting end performs rate matching after channel coding to achieve an arbitrary target code length, and performs rate de-matching before channel decoding at the receiving end.

The embodiment of the present application can be applied to a wireless communication system, which generally includes cells, each of which includes a Base Station (BS) that provides communication services to a plurality of Mobile Stations (MSs), where the Base Station is connected to a core network device, as shown in fig. 3.

It should be noted that, the wireless communication systems mentioned in the embodiments of the present application include, but are not limited to: narrow Band Internet of Things (NB-IoT), Global System for Mobile Communications (GSM), Enhanced Data rate (Enhanced Data for GSM Evolution (EDGE)), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access 2000 (Code Division Multiple Access, TD-LLC), Long Term Evolution (Long Term Evolution (LTE)), and triple application scenarios (TC, BB and URTC) of the next-generation 5G Mobile communication System.

In the embodiment of the present application, the base station is an apparatus deployed in a radio access network to provide a wireless communication function for a UE. The base stations 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 systems using different radio access technologies, the name of a device having a base station function may be different, for example, in an LTE system, the device is called an evolved Node B (eNB or eNodeB), and in a third Generation (3 rd Generation, abbreviated as 3G) system, the device is called a Node B (english: Node B). For convenience of description, in all embodiments of the present application, the above-mentioned apparatuses providing a UE with a wireless communication function are collectively referred to as a base station or a BS.

The MS referred to in the embodiments of the present application may include various handheld devices, vehicle mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem with wireless communication capability. The MS may also be called a terminal (english), and may further include a subscriber unit (english), a cellular phone (english), a smart phone (english), a wireless data card, a Personal Digital Assistant (PDA) computer, a tablet computer, a wireless modem (english), a handheld device (english), a laptop computer (english), a Machine Type Communication (MTC) terminal, and the like. For convenience of description, in all embodiments of the present application, the above-mentioned devices are collectively referred to as an MS.

In 87 times of 3GPP (3 rd Generation Partnership Project, chinese: third Generation Partnership Project) RAN1 (Radio Access Network, chinese: Radio Access Network) conferences, Polar codes are formally received as a channel coding scheme for uplink and downlink control channels in a 5G eMBB (enhanced Mobile Broadband) scenario.

The Polar code is briefly introduced below.

Communication systems typically employ channel coding to improve the reliability of data transmission to ensure the quality of communications. Polar codes proposed by Arikan professor Arikan are the first codes that theoretically prove to be able to reach shannon capacity and have low coding complexity. Polar code is also a linear block code with a coding matrix of G_NThe coding process is

Wherein

Is a binary row vector with length N (i.e., code length); g_NIs an N × N matrix, and

is defined as log₂N matrices F₂Kronecker (Kronecker) product of (a). The matrix is

In the encoding process of the Polar code,

a part of the bits used to carry information is called information bit set, and the index set of these bits is marked as A; the other part of the bits are set as a fixed value predetermined by the transmitting and receiving end, called a fixed bit set or a frozen bit set (frozen bits), and the set of the indexes is the complement A of A^cAnd (4) showing. The encoding process of Polar code is equivalent to:

here, G_N(A) Is G_NThe sub-matrix of (A) resulting from those rows corresponding to the indices of set A, G_N(A^C) Is G_NIn (A) is set^cThe index in (1) corresponds to those rows of the resulting sub-matrix. u. of_AIs composed of

The number of the information bit sets is K;

is composed of

The fixed set of bits, whose number is (N-K), are known bits. These fixed bits are usually set to 0, but may be arbitrarily set as long as the transceiving end agrees in advance. Thus, Polar code encodingThe process can be simplified as follows:

here, the

Is composed of

The set of information bits in (1) is,

is a row vector of length K, i.e.

I.e. represents the number of elements in the set, K is the information block size,

is a matrix G_NMiddle group collection

The sub-matrix obtained for those rows corresponding to the index in (1),

is a K × N matrix.

Polar code construction process or set

The selection process of (2) determines the performance of Polar codes. The Polar code construction process generally includes determining that N polarized channels coexist according to the code length N of the mother code, respectively corresponding to N rows of the coding matrix, calculating the reliability of the polarized channels, and using the indexes of the first K polarized channels with higher reliability as a set

The indexes corresponding to the remaining (N-K) polarized channels as the index set of the fixed bits

Of (2) is used. Collection

Determining the position, set, of information bits

The position of the fixed bit is determined. As can be seen from the coding matrix, the code length of the original Polar code (mother code) is an integer power of 2, and in practical application, the Polar code with any code length needs to be realized through rate matching.

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

PC-Polar is Polar code introducing Parity Check (English: Parity Check, abbreviated as PC). The PC-Polar introduces parity check bits into the vector to be encoded, and FIG. 5 shows an example of PC-Polar of 8 × 8, and it can be seen that the 5th bit to be encoded is a copy of the 4 th bit to be encoded. In PC-Polar, the value of the PC fixed bit set is a function of the information bits with sequence numbers smaller than that of the PC fixed bit set, and copying is a special case.

The shift register introduced in the existing PC-Polar scheme generates the value of the PC fixed bit set as shown in fig. 6. A register of a particular length is first initialized and, as shown on the left side of fig. 6, the value of the information bit is placed in the register when the information bit is encountered. As shown on the right of FIG. 6, when the PC fixed bit set is encountered, the value in the register is read and placed into the encoding position of the PC fixed bit set.

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

The application provides a control information transmission method, which can be applied to network equipment, for example: the base station or the Baseband processing Unit (BBU) in fig. 3. Fig. 7 is a flowchart of the control information transmission method, which includes the following specific steps:

step 210: and the network equipment scrambles the control information bits to be coded by using the terminal identification, and the positions of the scrambled control information bits comprise the positions of the fixed bit sets of the parity check PC.

Optionally, the positions of the scrambled control information bits further comprise at least one of: the position of the cyclic redundancy check, CRC, sequence, and the position of the fixed set of bits.

Step 220: and the network equipment encodes the scrambled control information bits by adopting a Polar code and sends a bit sequence obtained by encoding to the terminal.

It should be noted that the control information transmission apparatus 300 shown in fig. 8 can implement the LDPC encoding and transmitting processes in steps 210 to 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 transmitting 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 also be an Application Specific Integrated Circuit (ASIC) or a chip that implements related functions.

The following describes steps 210 to 220 with reference to fig. 9, where fig. 9 shows control information bits (vectors to be encoded) to be encoded by Polar, and the control information bits include an information bit set, a PC fixed bit set, and a fixed bit set. The information bit set comprises downlink control information DCI and a CRC sequence, the CRC sequence is obtained by using CRC coding on the DCI, and the length of the CRC sequence is 16 bits.

Wherein, the terminal identifier in step 210 is a radio network temporary identifier RNTI. The LTE standard specifies that the length of RNTI is 16bits, and in the 5G communication system, the length of RNTI is not defined, and the length of RNTI is set to be 16bits or more in the present application. For example, the RNTI is 20 bits in length and can identify 1,048,576 different terminals at most. Therefore, when the length of the RNTI is larger than 16bits, hundreds of thousands of terminals or even millions of terminals can be identified at the same time, and the requirement of accessing massive Internet of things equipment in a 5G network eMTC scene can be met.

It should be noted that the positions of the scrambled control information bits in step 210 include the following implementation manners.

Embodiment 1: the scrambling positions are the positions of the CRC sequence and the positions of the PC fixed bit set and the positions of the fixed bit set.

And the network equipment scrambles the positions of the CRC sequence and the positions of the PC fixed bit set and the positions of the fixed bit set in the control information bits to be coded by using the RNTI and then carries out Polar coding. As shown in fig. 9, it is assumed that the length of RNTI is k bits and k >16, where the first 16bits of RNTI scramble the position of the CRC sequence in the control information bits to be encoded, and the remaining part of RNTI scrambles the position of the PC fixed bit set and the position of the fixed bit set in the control information bits to be encoded.

It should be noted that the three scrambling sequences for the positions of the CRC sequence, the positions of the PC fixed bit set and the positions of the fixed bit set may be three mutually different subsets of the RNTI. There may also be repeated bit information for the three scrambling sequences as long as the union of the three scrambling sequences is satisfied to contain all bit information of the RNTI.

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

And the network equipment scrambles the PC fixed bit set in the control information bits to be coded by using the RNTI and then carries out Polar coding. As shown in fig. 10, the length of the information bit set is k, the length of the PC fixed bit set is m-k, and the length of the fixed bit set is n-m. It is assumed that the length of the RNTI is 18 bits and m-k > 18. And selecting 18 bits of RNTIs with the highest reliability from high to low in the PC fixed bit set for scrambling, wherein the reliability of the part, close to the information bit set, of the PC fixed bit set is higher.

Embodiment 3: the scrambling positions are the positions of the CRC sequence and the positions of the PC fixed bit set.

As shown in fig. 11, the length of the information bit set is k, the length of the PC fixed bit set is m-k, and the length of the fixed bit set is n-m. The network equipment scrambles a part of RNTI to the position of a PC fixed bit set of control information bits to be coded, the base station scrambles the rest part of RNTI to the position of a CRC sequence of the control information bits to be coded by taking the length of the RNTI as 18 bits as an example, the network equipment scrambles the upper 2 bits of the RNTI to the position of the PC fixed bit set, and the rest 16bits of the RNTI are scrambled to the position of the CRC sequence.

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

Optionally, the network device processes a part of content of the RNTI through a specific function and scrambles the processed part of the RNTI to a position of a PC fixed bit set of the control information bits to be encoded, as shown in fig. 12, taking length 18 bits of the RNTI as an example, repeating a high 2bit of the RNTI for 3 times to obtain 6bits, scrambling the 6bits to a position of the PC fixed bit set, and scrambling remaining 16bits in the RNTI to a position of a CRC sequence.

Embodiment 4: the scrambling positions are the positions of the PC fixed bit set and the positions of the fixed bit set.

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

Optionally, the network device processes a part of content of the RNTI through a specific function and scrambles the processed part of RNTI to a position of a PC fixed bit set of control information bits to be encoded, as shown in fig. 12, taking 18 bits of the length of the RNTI as an example, repeating 3 times for a high 2bit of the RNTI to obtain 6bits, scrambling the 6bits to the position of the PC fixed bit set, and scrambling the remaining 16bits in the RNTI to the position of the fixed bit set.

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

It should be noted that the scrambling includes direct exclusive or of RNTI, direct exclusive or of RNTI and superposition of terminal-side antenna selection information, and generation of a scrambling sequence with RNTI as a random number of seeds. The example illustrates that the RNTI is used as a random number seed to generate a scrambling sequence, the RNTI with the length of 16bits is used as a random number seed to generate the scrambling sequence with the length of 300 bits, and the 300 bits are the length of a PC fixed bit set and a fixed bit set.

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

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

The RNTI is carried by the register initial value, and the following embodiments are also included.

Embodiment 1: RNTI is carried by initial value of register

As shown in fig. 14, the RNTI length is p, the register width is p, and the RNTI can be encoded as the initial register value.

Embodiment 2: the RNTI part is carried by the initial value of the register through specific function processing

And the network equipment performs repeated operation on part of bits of the RNTI to obtain a repeated bit sequence, and the repeated bit sequence is used as a register initial value to be coded.

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 for storing programs;

a processor 403 for executing the program stored in the memory, the processor scrambling control information bits to be encoded using a terminal identity when the program is executed, the positions of the scrambled control information bits comprising the positions of a parity PC fixed bit set; and the processor encodes the scrambled control information bits by adopting a Polar code for the network equipment.

A transceiver 401 configured to transmit 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 executed by the processor is consistent with the foregoing content, and is not described in detail.

In this application, the network device scrambles the control information bits to be encoded using the RNTI, the positions of the scrambled control information bits include the position of the PC fixed bit set, the position of the CRC sequence, and the position of the fixed bit set, and the length of the RNTI is greater than or equal to 16 bits. This application also introduces carrying the RNTI by the initial value of the register. By the mode, the network equipment supports longer RNTI and can better support the access of large-scale Internet of things equipment.

The present application also provides a control information transmission method, which can be applied to a terminal, for example: MS1-MS2 in FIG. 3. Fig. 16 is a flowchart of the control information transmission method, which includes the following specific steps:

step 510: and the terminal receives a bit sequence sent by the base station, wherein the bit sequence is obtained by the base station by coding the control information bits by adopting Polar codes.

It should be noted that, for the decoding characteristics of Polar codes, the present application further improves the flow before step 510, and the flow chart is shown in fig. 18. Before blind detection, SC (Chinese: serial cancellation) decoding is carried out on each potential DCI position at least twice, and a corresponding PM (Path Metric) value is recorded, wherein the smaller the absolute value of the PM is, the Path decoding is representedThe higher the probability that the code is correct. Wherein PM is a decoding measurement value obtained by scrambling fixed bits by using RNTI of MS, and PM is obtained by using the RNTI of the MS_invIn order to reverse the decoding metric value of the scrambled fixed bits using the RNTI of the MS itself, PM0 is the decoding metric value of all 0 scrambled fixed bits, PM1 is the decoding metric value of all 1 scrambled fixed bits, and a new metric is obtained according to these several decoding metric values, for example, the metric is PM/(PM0+ PM1), there are 44 DCI potential positions, SC decoding is performed three times on all 44 potential DCI positions to obtain the metric of 44 potential DCI positions, and the 44 metrics are sorted from small to large.

Step 520: and the terminal determines the bit position and the value of a terminal identifier in the Polar code, wherein the bit position of the terminal identifier comprises a parity check fixed bit set.

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

Step 530: and the terminal uses the terminal identification to descramble the bits corresponding to the determined bit positions to obtain the fixed bit set and the parity check fixed bit set.

Step 540: and the terminal decodes the bit sequence by using the fixed bit set, the parity check fixed bit set and a check equation to obtain an information bit set, wherein the information bit set comprises Downlink Control Information (DCI) and a Cyclic Redundancy Check (CRC) sequence.

Step 550: and the terminal descrambles the CRC sequence in the information bit set by using the terminal identification, and the terminal performs CRC check on the DCI, and if the CRC check is passed, the DCI is obtained.

It should be noted that the control information transmission apparatus 600 shown in fig. 17 may implement the process from 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, the checking unit 640 is configured to perform the checking process in step 550, and the decoding unit 650 is configured to perform step 540. The control information transmission device may be, for example, a station or a user terminal, or 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 540 is similar to the process of blind detection of PDCCH in the existing LTE. In the process of blind detection of the PDCCH of the terminal, the terminal carries out blind detection on the potential DCI position according to the metric sequencing information until the CRC passes.

Fig. 19 is a diagram showing a simulation of statistical distribution of blind detection actual decoding times at a position where the block error rate BLER is 0.01 after the sorting. It can be seen that almost all of the decoding was detected for the first time. The scheme reduces the average number of blind tests.

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

Wherein, in step 520, the terminal determines the bit position and value of the terminal identifier in the Polar code. As can be seen from the foregoing description, the bit positions of the terminal identifier in the Polar code include various implementations, and therefore, the decoding side of the terminal also includes various implementations.

Case 1: all scrambling of RNTI to PC fixed bit set

When the terminal decodes, the RNTI distributed by the base station is adopted to descramble the PC fixed bit and decode the PC fixed bit, and if the decoding result passes the CRC check, the decoding result indicates that the PC fixed bit is found and decoded correctly.

Case 2: the RNTI portion (e.g., upper 2 bits) is scrambled to a PC fixed bit set position and the remainder of the RNTI is scrambled to a fixed bit set position or a CRC sequence position

And when the terminal decodes, the high 2 bits of the RNTI allocated by the base station are adopted to descramble and decode the PC fixed bit set, the rest part of the RNTI is used to descramble the CRC sequence or the fixed bit set, and if the decoding result passes the CRC check, the PDCCH is found and the decoding is correct.

Case 3: RNTI is carried by register initial value

And when the terminal decodes, the RNTI distributed by the base station is adopted to descramble the initial value of the register and decode the initial value, and if the decoding result passes the CRC check, the decoding result indicates that the decoding is found and correctly decoded.

It should be noted that the descrambling operation in this application includes an exclusive or operation, so the descrambling operation in this application achieves the same effect as the scrambling operation.

Such as the communication device 400 shown in fig. 15. 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 obtained by coding a control information bit by using a Polar code and then sending the coded bit sequence to other devices.

A memory 402 for storing programs;

a processor 403 for executing said program stored in said memory, said processor determining bit positions and values of terminal identities in said Polar codes when said program is executed, said terminal identities bit positions comprising a set of parity fixed bits; the processor uses the terminal identification to descramble the bits corresponding to the determined bit positions to obtain the fixed bit set and the parity check fixed bit set; the processor decodes the bit sequence by using the fixed bit set, the parity check fixed bit set and a check equation to obtain an information bit set, wherein the information bit set comprises Downlink Control Information (DCI) and a Cyclic Redundancy Check (CRC) sequence; and the processor descrambles the CRC sequence in the information bit set by using the terminal identification, and the terminal performs CRC check on the DCI, and if the CRC check is passed, 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 application, the terminal performs SC decoding on the potential DCI positions before PDCCH blind detection starts to obtain the PM value of each potential position, and sequences the PM values of each potential position. Through the method, the terminal can improve the probability of correct decoding in the PDCCH blind detection process and reduce the number of blind detection searches.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical storage media (e.g., DVDs), etc.

Claims

1. A transmission method of control information is applied to a wireless network and comprises the following steps:

the network equipment scrambles the control information bits to be coded by using the terminal identification, and the positions of the scrambled control information bits comprise the positions of the parity check PC fixed bit sets;

and the network equipment encodes the scrambled control information bits by adopting a Polar code and sends a bit sequence obtained by encoding to the terminal.

2. The method of claim 1, wherein the positions of the scrambled control information bits further comprise at least one of: the position of the cyclic redundancy check, CRC, sequence, and the position of the fixed set of bits.

3. The method of claim 2, 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, and the CRC sequence is obtained by CRC encoding of the DCI.

4. A method according to any one of claims 1 to 3, wherein the terminal identity is a radio network temporary identity, RNTI, having a length greater than or equal to 16 bits.

5. A transmission device of control information is applied to a wireless communication system and comprises:

the scrambling unit scrambles the control information bits to be coded by using the terminal identification, and the positions of the scrambled control information bits comprise the positions of the parity check PC fixed bit sets;

the coding unit is used for coding the scrambled control information bits by adopting a polarity Polar code;

and a transmitting unit for transmitting the encoded bit sequence to the terminal.

6. The transmission apparatus of claim 5, wherein the positions of the scrambled control information bits further comprise at least one of: the position of the cyclic redundancy check, CRC, sequence, and the position of the fixed set of bits.

7. The transmission apparatus of claim 6, 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, and the CRC sequence is obtained by using CRC encoding on the DCI.

8. The transmission apparatus according to any of claims 5 to 7, wherein the terminal identity is a radio network temporary identity RNTI, and the length of the RNTI is greater than or equal to 16 bits.

9. A communication device, comprising:

a memory for storing a program;

a processor for executing the program stored in the memory, the processor scrambling control information bits to be encoded using a terminal identification when the program is executed, the locations of the scrambled control information bits comprising the locations of a set of parity PC fixed bits; the processor encodes the scrambled control information bits by adopting a polarity Polar code;

10. The communications device of claim 9, wherein the positions of the scrambled control information bits further comprise at least one of: the position of the cyclic redundancy check, CRC, sequence, and the position of the fixed set of bits.

11. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by a network device, is able to implement the method of any one of claims 1 to 4.