WO2017186173A1

WO2017186173A1 - Contention access method and device

Info

Publication number: WO2017186173A1
Application number: PCT/CN2017/082526
Authority: WO
Inventors: 袁志锋; 李超
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-29
Filing date: 2017-04-28
Publication date: 2017-11-02
Also published as: CN107343322A; CN107343322B

Abstract

Embodiments of the present invention provide a contention access method and device. A terminal side can select an orthogonal sequence corresponding to the terminal from K orthogonal sequences in a long term evolution (LTE) contention access process, wherein K is an integer greater than or equal to 2; a MSG3 is extended using the selected orthogonal sequence and is then sent out. If a collision occurs, that is, MSG3s of multiple terminals are scrambled using a same TC-RNTI, a base station may carry out demodulation to obtain multiple users simultaneously according to the extended MSG3s, and deliver information indicating that the collision is resolved successfully to the terminals by means of a MSG4 with additionally added bits. The embodiments of the present invention solve the problem of collisions when multiple users access a base station simultaneously and improve the collision resolution capability of the base station.

Description

Competitive access method and device

Technical field

The present disclosure relates to the field of communications, and in particular to a contention access method and apparatus.

Background technique

The long-term evolution (Long-Term Evolution, LTE for short) random access technology can be divided into two types, one is non-competitive random access technology, and the other is competitive random access technology. For the non-contention random access technology, the base station may assign a specific physical random access channel (Physical Random Access Channel, PRACH) resource to the terminal to send a dedicated preamble sequence; for the contention random access technology, the base station cannot specify the terminal. Preamble sequence and PRACH resources. The process of LTE competition random access technology can be divided into the following steps:

Step 1: The terminal sends a preamble sequence to inform the base station that there is a random access request, and at the same time enables the base station to estimate the transmission delay between the terminal and the terminal and thereby calibrate the uplink timing timing. If the terminal wants to successfully send the preamble sequence, it needs to randomly select a preamble sequence and assign a PRACH resource to the preamble sequence. It is these two factors that determine whether the terminal will conflict when sending the MSG3. A collision occurs when the same preamble sequence is sent on the same PRACH resource.

Step 2: The base station sends a random access response. After the terminal sends the preamble sequence, it will listen to the physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) in the random access response (RAR) to receive the temporary network identifier of the corresponding routing area (Routing). Area Radio Network Temporary Identifier (RA-RNTI) RAR. The resources sent by the MSG3, time calibration information, and the like are specified in the random access response.

Step 3: The terminal sends MSG3. The reason why the third message (that is, the information sent by the terminal in the third step) is called MSG3 instead of a specific message is that the message may be different depending on the state of the terminal and the application scenario. Collectively referred to as MSG3. MSG3 needs to contain an important message: a unique identifier for each terminal.

Step 4: The base station sends the conflict resolution information MSG4. In the conflict resolution mechanism, the base station carries a unique flag in the MSG 4 to specify the winning terminal.

With the continuous expansion of the Internet of Things market, Machine-Type Communication (MTC) has become an important branch of cellular networks.

Because the device density of machine communication is much greater than the density of devices communicated between traditional human-to-Human (H2H), this will cause a huge amount of devices to be triggered at the same time, and through random The access channel (Rand access channel, RACH for short) initiates an access request to the base station, which inevitably causes information conflicts, which in turn leads to a series of problems such as access delay and information congestion. Therefore, the random access procedure of LTE is no longer adapted to random access of machine communication.

Therefore, in the face of random access by a large number of users, for machine communication, how to solve the conflict problem when a large number of users simultaneously access has become a top priority in designing its access technology. However, for the machine communication with massive random access, the occurrence of conflict is almost inevitable, so it is very important to improve the ability of the base station to resolve the conflict while minimizing the probability of collision. However, the solution in the related art may have the problem that the ability of the base station to resolve the conflict cannot be improved when a collision occurs.

In view of the above problems, an effective solution has not been proposed in the related art.

Summary of the invention

The embodiments of the present disclosure provide a contention access method and apparatus to solve at least the problem in the related art that the ability of the base station to resolve a conflict cannot be improved when a collision occurs.

According to an embodiment of the present disclosure, a contention access method is provided, including: selecting, in a terminal access procedure, an orthogonal sequence corresponding to a terminal from K orthogonal sequences, where K is greater than or equal to 2 An integer; the third message MSG3 is extended by the selected orthogonal sequence; the extended MSG3 is transmitted.

Optionally, the expanding the MSG3 by using the selected orthogonal sequence comprises: Separating the data symbols of the MSG3 with each element of the selected orthogonal sequence, respectively, such that each of the data symbols of the MSG3 forms a length with the selected orthogonal sequence The same sequence of symbols.

Optionally, each element in the selected orthogonal sequence takes a value of the set {+1, -1}.

Optionally, selecting an orthogonal sequence corresponding to the terminal from the K orthogonal sequences includes: in the case of transmitting the extended MSG3 for the first time, the extended MSG3 corresponding to the first transmission is positive The intersection sequence is an orthogonal sequence randomly selected from the K orthogonal sequences; and/or, in the case of retransmitting the extended MSG3, retransmitting the extended orthogonal sequence corresponding to the MSG3 An orthogonal sequence identical to the orthogonal sequence selected when the extended MSG3 is first transmitted is selected from the K orthogonal sequences, or one orthogonal sequence is randomly selected from the K orthogonal sequences.

Optionally, after the extended MSG3 is sent to the base station, the method further includes: receiving an improved fourth message MSG4 from the base station; when the terminal is initially accessing the base station, using The temporary cell radio network temporary identifier TC-RNTI detects the received improved MSG4, wherein when the terminal is the first time accessing the base station, the MSG3 carries the identity identification information of the terminal, The TC-RNTI is used by the base station to perform scrambling processing on the improved MSG4; if the detection result is that information corresponding to the identifier information of the terminal is detected, it is determined that the terminal successfully accesses the base station; and/or, If the detection result is that the information corresponding to the identifier information of the terminal is not detected, it is determined that the terminal does not successfully access the base station;

Alternatively, the terminal is to reestablish the connection with the base station, and the received improved MSG4 is detected by using the cell radio network temporary identifier C-RNTI, where the terminal is reestablishing the connection with the base station, then the MSG3 is in the MSG3. Carrying the C-RNTI information, where the C-RNTI is used by the base station to scramble the improved MSG4; if the detection result is that the improved MSG4 is scrambled by the C-RNTI, then the determined The terminal successfully accesses the base station; and/or, if the detection result is that the improved MSG4 is scrambled by the C-RNTI, it is determined that the terminal does not successfully access the base station, where the The improved MSG4 is MSG4 with a predetermined number of bits added.

Optionally, when the terminal is initially accessing the base station, after determining that the terminal successfully accesses the base station, the method further includes: determining, according to the improved MSG4, the cell allocated by the base station. The wireless network temporarily identifies the C-RNTI.

Optionally, determining, according to the improved MSG4, the cell radio network temporary identifier C-RNTI allocated by the base station includes: acquiring, in the improved MSG4, an M that is additionally added by the base station and corresponding to the terminal a bit, where M is an integer greater than or equal to 0; dividing the TC-RNTI into M segments, wherein the M segments are in one-to-one correspondence with the M bits; according to the value pairs of the M bits The M segments are respectively flipped; and the C-RNTI is determined according to the inversion result of the TC-RNTI.

Optionally, performing the inversion of the M segments according to the value of the M bits includes: performing a flip between 0 and 1 of the TC-RNTI segment corresponding to the bit with the bit value of 1, and a bit with a bit value of 0 The corresponding TC-RNTI segment is not inverted; or the TC-RNTI segment corresponding to the bit with the bit value of 0 is inverted between 0 and 1, and the TC-RNTI segment corresponding to the bit with the bit value of 1 is not inverted.

According to another embodiment of the present disclosure, there is provided a contention access method, comprising: receiving an extended MSG3 from a terminal, wherein the extended MSG3 is for the terminal to perform MSG3 using the selected orthogonal sequence Obtaining, the selected orthogonal sequence is an orthogonal sequence corresponding to the terminal selected by the terminal from the K orthogonal sequences in the access process, and K is an integer greater than or equal to 2; The extended MSG3 performs demodulation; and controls the terminal to access the base station according to the demodulation result.

Optionally, performing demodulation on the extended MSG3 includes: performing blind detection on the extended MSG3 by randomly selecting an orthogonal sequence from the K orthogonal sequences, where the blind detection includes the following Processing: performing a correlation operation on each of the K orthogonal sequences and the received MSG3 data; the result of the correlation operation is that the demodulated decoding of the extended MG3 is successful, and then determining Demodulating the terminal successfully; and/or, if the result of the correlation operation is demodulation decoding failure, determining to demodulate the terminal fails.

Optionally, controlling the terminal to access the base station according to the demodulation result includes: After demodulating the terminal successfully, it is determined whether there are other terminals that have been demodulated successfully, and other terminals that use the same scrambling mode as the terminal; if the determination result is yes, the following operations are performed: the terminal is reconstructed and The connection of the base station is performed by using the cell radio network temporary identifier C-RNTI to scramble the improved MSG4, wherein the terminal reestablishes the connection with the base station, and the MSG3 includes the C-RNTI information of the terminal. ;

Alternatively, the terminal accesses the base station for the first time, and then uses the temporary cell radio network temporary identifier TC-RNTI to scramble the improved MSG4, where the terminal first accesses the base station, and the MSG3 carries Having the identity information of the terminal; the improved MSG4 is sent to the terminal, where the improved MSG4 is used for the terminal to access the base station; The improved fourth message is a fourth message with a predetermined number of bits added.

Optionally, the improved MSG4 is determined by determining that the total number of the terminal and the other terminal is R, determining M bits corresponding to the terminal, where the M bits are used for The terminal inverts the acquired TC-RNTI to obtain a C-RNTI for accessing the base station, and values of M bits corresponding to different terminals are different, 1≤R≤K, and M is greater than or equal to 0. An integer of 2 ^M-1 + ... + 2 ⁰ ≥ R; the improved MSG 4 is determined by adding the M bits in MSG 4 .

Optionally, after determining the M bits corresponding to the terminal, the method further includes: dividing the TC-RNTI into M segments, where the M segments are in one-to-one correspondence with the M bits; And the M segments are respectively inverted according to the values of the M bits; and the C-RNTI used by the terminal is determined according to the inversion result.

Optionally, determining M bits corresponding to the terminal includes: corresponding to the terminal The M bits are set to a predetermined value, and it is determined whether the TC-RNTI obtained by the terminal after inverting the TC-RNTI according to the predetermined value is the same as the existing TC-RNTI of other terminals; if the judgment result is the same, Adding a data value to the predetermined value, and flipping the TC-RNTI of the terminal again according to the value of the new M bits, and performing the foregoing determining operation and the adding operation cyclically until the terminal is flipped The TC-RNTI is different from the existing TC-RNTI of the other terminal, and determines that the final value is the value of the M bits; or, until the value of the M bits corresponding to the terminal is the maximum value and discards the direction The terminal sends the improved MSG4; if the determination result is different, it is determined that the predetermined value is a value of M bits corresponding to the terminal.

Optionally, sending the scrambled improved MSG4 to the terminal comprises: sending the scrambled improved MSG4 to the terminal at different times than sending the improved MSG4 to the other terminal .

According to another embodiment of the present disclosure, a contention access apparatus is provided, including: a selection module, configured to select an orthogonal sequence corresponding to a terminal from K orthogonal sequences in a terminal access process, where K is an integer greater than or equal to 2; an extension module configured to perform MSC3 extension processing using the selected orthogonal sequence; and a transmitting module configured to transmit the extended MSG3 to the base station.

Optionally, the extension module performs an extension process on the third message by using the selected orthogonal sequence by: respectively, data symbols of the third message and the selected orthogonal sequence Each element is multiplied such that each of the data symbols of the third message form a sequence of symbols that is the same length as the selected orthogonal sequence.

Optionally, the selecting module selects an orthogonal sequence corresponding to the terminal from the K orthogonal sequences by: transmitting the first time after the extended third message is sent for the first time. The orthogonal sequence corresponding to the extended third message is an orthogonal sequence randomly selected from the K orthogonal sequences; and/or, in the case of retransmitting the extended third message And the orthogonal sequence corresponding to the third message that is retransmitted and extended is an orthogonal sequence selected from the K orthogonal sequences and selected when the extended third message is sent for the first time. The same orthogonal sequence, or one orthogonal sequence is randomly selected from the K orthogonal sequences.

According to another embodiment of the present disclosure, there is provided a contention access apparatus, comprising: a receiving module configured to receive an extended MSG3 from a terminal, wherein the extended MSG3 is selected for use by the terminal The orthogonal sequence is obtained by performing an extension process on the MSG3, where the selected orthogonal sequence is an orthogonal sequence corresponding to the terminal selected by the terminal from the K orthogonal sequences in the access process, where K is greater than or equal to An integer of 2; a demodulation module configured to demodulate the extended MSG3; and a control module configured to control the terminal access base station according to the demodulation result.

Optionally, the demodulation module demodulates the extended third message by randomly selecting one orthogonal sequence from the K orthogonal sequences to the extended third strip The message is blindly detected, wherein the blind detection comprises: performing a correlation operation with each of the K orthogonal sequences and the received third message; the result of the correlation operation is Demodulating and decoding the extended third message succeeds, determining to demodulate the terminal successfully; and/or, if the result of the correlation operation is demodulation decoding failure, determining to demodulate the terminal fails.

Optionally, the control module controls, according to the demodulation result, the terminal to access the base station according to the demodulation result: after demodulating the terminal successfully, determining whether any terminal that has been successfully demodulated exists or not If the terminal is in the process of reestablishing the connection with the base station, the terminal uses the temporary identifier of the cell radio network to add the improved fourth message. Interference, wherein the terminal reestablishes a connection with the base station, and the third message includes the cell radio network temporary identification information of the terminal; or the terminal is used for the initial access to the base station, The temporary cell radio network temporary identifier is used to scramble the improved fourth message, where the terminal accesses the base station for the first time, and the third message carries the identity information of the terminal; The improved fourth message is sent to the terminal, where the scrambled improved fourth message is used by the terminal to access the base station; , The fourth message of the fourth improvement is to increase the number of bits of a predetermined message.

According to still another embodiment of the present disclosure, a storage medium is also provided. The storage medium is arranged to store program code for performing the above steps.

In accordance with yet another embodiment of the present disclosure, there is also provided a processor for running a program, wherein the program is operative to perform the steps of any of the methods described above.

With the embodiment of the present disclosure, the MSG3 is extended by using the orthogonal sequence corresponding to the terminal, so that the base station can control more terminal access, and effectively solve the conflict problem generated when multiple users access the base station at the same time, thereby improving the problem. Base station conflict resolution capabilities.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the present disclosure, which is a part of the present disclosure, and the description of the present disclosure and the description thereof are not intended to limit the disclosure. In the drawing:

1 is a flow chart of a first contention access method in accordance with an embodiment of the present disclosure;

2 is a flow chart of a second contention access method in accordance with an embodiment of the present disclosure;

3 is a flow chart of random access of LTE competition;

4 is a flow chart of processing of the improved MSG3 on the terminal and the base station side;

FIG. 5 is a flowchart of processing of the improved MSG 4 on the base station side;

6 is a flow chart of determining, by the base station side, the value of the added bit;

7 is a process flow of the improved improved MSG4 on the terminal side;

8 is a correspondence diagram of a sequence segment of TC-RNTI and 4 bits;

9 is a correspondence diagram of a sequence segment of TC-RNTI and 2 bits;

10 is a structural block diagram of a first type of contention access device according to an embodiment of the present disclosure;

11 is a structural block diagram of a second contention access device according to an embodiment of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted, The embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In the LTE contention access technology, the steps related to the solution of the conflict problem are the third step (MSG3) and the fourth step (MSG4), wherein the performance of the MSG3 signal itself and the processing manner of the base station to the MSG3 will directly affect the base station to resolve the conflict. The ability, and MSG4 will send the result of the conflict resolution to the terminal.

Therefore, in order to cope with the conflict problem of the machine communication, in the embodiment of the present disclosure, the MSG3 transmission form in the LTE contention access technology is improved on the terminal side, and the corresponding processing procedure is performed on the base station side to improve the base station's ability to resolve the conflict. .

Correspondingly, the base station can determine different transmission forms of the MSG4 according to different processing manners for the MSG3 collision: for a plurality of users scrambled by using the same TC-RNTI, if the specified base station only demodulates one of the users, the transmission form of the MSG4 The MSG4 transmission form in the same manner as the LTE competition access is the same; if it is specified that the base station can demodulate a plurality of user signals, then the transmission form of the MSG4 needs to be improved.

In this embodiment, a contention access method is provided. FIG. 1 is a flowchart of a first contention access method according to an embodiment of the present disclosure. As shown in FIG. 1, the process includes the following steps:

Step S102, in the terminal access process, selecting an orthogonal sequence corresponding to the terminal from the K orthogonal sequences, where K is an integer greater than or equal to 2;

Step S104, performing an extension process on the MSG3 by using the selected orthogonal sequence;

In step S106, the extended MSG3 is sent.

The foregoing operations may be performed by the terminal, where the terminal access may be that the terminal competes for access in the LTE, and the extended MSG3 may be sent to the base station, where the MSG3 is the third information of the LTE contention access process. (Information sent by the terminal in step 3 of the LTE competition access procedure).

In the foregoing step, sending the extended MSG3 to the base station may include: expanding, by using the selected orthogonal sequence, the MSG3 scrambled by using the temporary cell radio network temporary identifier TC-RNTI, and sending the extended MSG3 to The base station, wherein the extended MSG3 is used by the base station to control the terminal accessing the base station, where the TC-RNTI may be obtained by the terminal in advance from the RAR from the base station.

When the base station faces the access of a large number of users, the conflict problem is an inevitable problem in the machine communication access technology. In the above steps, since the MSG3 is extended by using the orthogonal sequence corresponding to the terminal, the base station can be controlled. More terminal access, that is, by improving the LTE competitive access technology, the base station can improve the processing capability of the collision information, and correspondingly reduce the access delay, information congestion, etc. caused by multiple retransmissions. The problem is to improve the overall performance of the machine communication access technology.

In an optional embodiment, the expanding the MSG3 by using the selected orthogonal sequence comprises: multiplying the data symbols of the MSG3 with each element of the selected orthogonal sequence, such that the data symbols of the MSG3 Each of the data symbols forms a sequence of symbols that is the same length as the selected orthogonal sequence. That is, after the "one" data symbol is expanded by the orthogonal sequence, it becomes a symbol sequence having the same length as the orthogonal sequence.

In an optional embodiment, each element in the selected orthogonal sequence takes a value of the set {+1, -1}, that is, the value of the element in the selected orthogonal sequence may be + 1 or -1.

In an optional embodiment, selecting the orthogonal sequence corresponding to the terminal from the K orthogonal sequences includes: if the extended MSG3 is sent for the first time, the orthogonal sequence corresponding to the extended MSG3 sent for the first time An orthogonal sequence randomly selected from K orthogonal sequences; and/or, in the case of retransmitting the extended MSG3, the orthogonal sequence corresponding to the retransmitted MSG3 is from the K orthogonal sequences The orthogonal sequence identical to the orthogonal sequence selected when the extended MSG3 is first transmitted is selected, or one orthogonal sequence is randomly selected from the K orthogonal sequences.

In an optional embodiment, after the extended MSG3 is sent to the base station, the method further includes: receiving the improved MSG4 from the base station, where the MSG4 is the fourth of the LTE contention access process. Information (ie, step 4 in the LTE competitive access process) The information sent by the station to the terminal, that is, the information sent by the base station to the terminal; when the terminal is the first time to access the base station, the MSG3 carries the identity information of the terminal, and the base station can use the TC-RNTI to improve the MSG4. If the terminal accesses the base station for the first time, the terminal can use the TC-RNTI to detect the received improved MSG4. If the detection result is that the information corresponding to the identification information of the terminal is detected, the terminal is determined to be successful. Accessing the base station; and/or, if the detection result is that the information corresponding to the identifier information of the terminal is not detected, determining that the terminal does not successfully access the base station;

Alternatively, when the terminal is connected for reestablishment (that is, when the terminal is reestablishing the connection with the base station), the MSG3 includes the C-RNTI information of the terminal (the C-RNTI may be determined when the terminal first accesses the base station), and the base station may The MSG4 is scrambled by using the C-RNTI. When the terminal is reconnected, the terminal can use the C-RNTI to detect the improved MSG4. The detection result is that the improved MSG4 is added by C-RNTI. If the interference is successful, it is determined that the terminal successfully accesses the base station; and/or, if the detection result is that the improved MSG4 is scrambled by the C-RNTI, it is determined that the terminal does not successfully access the base station.

In an optional embodiment, when the terminal is initially accessing the base station, when determining that the terminal successfully accesses the base station, the method further includes: determining, according to the improved MSG4, a cell wireless network temporary identifier C- RNTI.

In an optional embodiment, determining the cell radio network temporary identifier C-RNTI allocated by the base station according to the improved MSG4 includes: acquiring M bits corresponding to the terminal that are additionally added by the base station in the improved MSG4, where M is an integer greater than or equal to 0; the TC-RNTI is divided into M segments, wherein the M segments are in one-to-one correspondence with M bits; the M segments are respectively flipped according to the values of the M bits; according to the TC-RNTI The flip result determines the C-RNTI. In this embodiment, the base station may configure different C-RNTIs for different terminals in order to access more terminals. Therefore, the terminal needs to determine the C- actually configured by the base station according to the M bits added in the MSG4 from the base station. RNTI.

In an optional embodiment, the M segment is respectively flipped according to the value of the M bits, and the TC-RNTI segment corresponding to the bit with the bit value of 1 is flipped between 0 and 1. The TC-RNTI segment corresponding to the bit with the bit value of 0 is not inverted; or the TC-RNTI segment corresponding to the bit with the bit value of 0 is flipped between 0 and 1, and the bit with the bit value of 1 corresponds to the TC-RNTI. The segment does not flip. The specific flipping method may be specified in the protocol, or may be negotiated by the base station and the terminal, or in a default manner, or indicated by the base station.

FIG. 2 is a flowchart of a second contention access method according to an embodiment of the present disclosure. As shown in FIG. 2, the process includes the following steps:

Step S202, receiving the extended MSG3 from the terminal, where the extended MSG3 is obtained by the terminal performing the extension processing on the MSG3 by using the selected orthogonal sequence, where the selected orthogonal sequence is in the terminal access process (for example, And the terminal selects an orthogonal sequence corresponding to the terminal from the K orthogonal sequences in the LTE contention access process, where K is an integer greater than or equal to 2;

Step S204, demodulating the extended MSG3;

Step S206, controlling the terminal access base station according to the demodulation result.

Wherein, the above operation may be performed by a base station.

Through the above steps, since the terminal performs the extension processing on the MSG3 by using the orthogonal sequence corresponding to the terminal, the base station can control more terminal access, and effectively solve the conflict problem generated when multiple users access the base station at the same time, thereby improving the problem. Base station conflict resolution capabilities.

In an optional embodiment, performing demodulation on the extended MSG3 includes: performing blind detection on the extended MSG3 by randomly selecting an orthogonal sequence from the K orthogonal sequences, where the blind detection includes the following Processing: performing a correlation operation with each of the K orthogonal sequences and the received extended MSG3; the result of the correlation operation is that the demodulation and decoding of the extended MG3 is successful, and the demodulation terminal is determined to be successful. And/or, the result of the correlation operation is that the demodulation decoding fails, and it is determined that the demodulation terminal fails. The orthogonal sequence set used for performing blind detection on the base station side (that is, the above K orthogonal sequences) should be the same as the orthogonal sequence set used when the terminal side performs the extension processing.

In an optional embodiment, controlling the terminal accessing the base station according to the demodulation result includes: determining, after demodulating the terminal, whether the terminal has successfully demodulated If the terminal is a connection re-establishment (that is, when reestablishing the connection with the base station), the MSG3 contains the C-RNTI information of the terminal, and the base station can use the other terminal in the same scrambling mode. The C-RNTI scrambles the improved MSG4, and the improved MSG4 is an MSG4 message with a predetermined number of bits added; or, when the terminal is initially accessing the base station, the MSG3 carries the identity information of the terminal, and the base station The improved MSG4 may be scrambled using TC-RNTI, which is an MSG4 message with a predetermined number of bits added; the improved MSG4 after scrambling is sent to the terminal, wherein the improved after scrambling The latter MSG4 is used for terminal access to the base station.

In an optional embodiment, the configuration of the “improved MSG4” appearing in the foregoing embodiment may be determined by determining that the total number of the terminal and other terminals is R, and determining the M corresponding to the terminal. a bit, where the M bits are used by the terminal to invert the acquired TC-RNTI to obtain a C-RNTI for accessing the base station, and the values of the M bits corresponding to different terminals are different, 1≤R≤K M is an integer greater than or equal to 0, and 2 ^M-1 + ... + 2 ⁰ ≥ R; the improved MSG 4 is determined by adding M bits in the above MSG 4 .

In an optional embodiment, after determining the M bits corresponding to the foregoing terminal, the method further includes: dividing the TC-RNTI into M segments, wherein the M segments are in one-to-one correspondence with M bits; The values of the M bits are respectively inverted for the M segments; the C-RNTI used by the terminal is determined according to the inversion result. That is, the C-RNTI used by the terminal needs to be recorded on the base station side to ensure that the terminal successfully accesses the base station.

In an optional embodiment, the M segment is respectively flipped according to the value of the M bits, and the TC-RNTI segment corresponding to the bit with the bit value of 1 is inverted by 0 and 1. The bit value is 0. The TC-RNTI segment corresponding to the bit is not inverted; or the TC-RNTI segment corresponding to the bit with the bit value of 0 is inverted between 0 and 1, and the TC-RNTI segment corresponding to the bit with the bit value of 1 is not inverted. . The specific flipping method may be specified in the protocol, or may be negotiated by the base station and the terminal, or in a default manner, or indicated by the base station.

In an optional embodiment, determining the M bits corresponding to the terminal includes: setting a predetermined value for the M bits corresponding to the terminal, and determining, by the terminal, the TC-RNTI obtained by inverting the TC-RNTI according to the predetermined value. Whether the existing TC-RNTIs of the other terminals are the same; if the judgment result is the same, a data value is added for the predetermined value, and the TC-RNTI of the terminal is flipped again according to the value of the new M bits, and the above judgment is performed cyclically. The operation and the adding operation are performed until the TC-RNTI of the terminal is different from the existing TC-RNTI of the other terminal, and the final determined value is determined as the value of the M bits; or, until the M bits corresponding to the terminal are taken The value is the maximum value and discards the improved MSG4 to the terminal; if the judgment result is different, it is determined that the predetermined value is the value of the M bits corresponding to the terminal. Through the above steps, it can be ensured that the C-RNTIs configured by the base station for each terminal to be accessed by the base station are different, thereby effectively solving the access conflict between the terminals.

In an optional embodiment, transmitting the scrambled improved MSG4 to the terminal comprises: transmitting the scrambled improved MSG4 to the terminal at different times than transmitting the improved MSG4 to other terminals . In this embodiment, for a plurality of terminals scrambled by the same TC-RNTI, when the base station demodulates a plurality of users, the base station may respectively send the improved MSG4 corresponding to each terminal at different times, thereby avoiding collision.

It can be seen from the foregoing embodiment that when multiple terminals access the base station to generate a collision, that is, when multiple MSGs of the terminal are scrambled by the same TC-RNTI, the base station can simultaneously demodulate more according to the extended MSG3. For the user, the information about the successful resolution of the conflict is sent to the terminal by the MSG4 with an additional bit added. Therefore, the conflict problem generated when multiple users access the base station at the same time is solved, and the conflict resolution capability of the base station is improved.

The present disclosure will be described below with reference to the accompanying drawings and specific embodiments:

3 is a RAT-based random access flowchart, in which System Information Block 2 (SIB2) is system information transmitted on a Downlink Share Channel (DL-SCH), and then LTE is competitive. 4 steps of random access, including: S302, MSG1: the terminal sends a preamble to the base station to request random access; S304, MSG2: the base station responds to the access request sent by the terminal; S306, MSG3: the terminal sets its own UE ID Reported to the base station; S308, MSG4: The base station sends the conflict resolution information to the terminal.

4 is a flow chart showing the processing of the improved MSG3 on the terminal and the base station side. As shown in FIG. 4, the terminal needs to extend the orthogonal sequence of the MSG3 data of the LTE before transmitting the improved MSG3. The base station side performs blind detection on the received improved MSG3 data based on the same orthogonal sequence set, wherein different MSG4 transmission forms can be separately designed according to different detection rules. When the base station demodulates only one of the users (corresponding to the above-mentioned terminal, UE) for multiple users scrambled by the same TC-RNTI, the base station adopts the same MSG4 transmission form as when competing for access with LTE; Multiple users scrambled with the same TC-RNTI are allowed to demodulate multiple users. Since one TC-RNTI corresponds to multiple users at this time, the base station needs to improve the MSG4 in LTE.

FIG. 5 is a flow chart of the improved MSG4 processing on the base station side, and FIG. 5 is determined by the base station side according to the number of demodulated users (ie, the number of terminals) and the TC-RNTI corresponding sequence segment bit flipping. A flowchart of the value of the added bit. If the base station demodulates a signal of the user and no longer detects the signals of other users based on the orthogonal sequence set, the UE ID of the user may be included in the MSG4 and sent to the MSG4. The user, the MSG4 delivered at this time has the same transmission form as the MSG4 in the LTE competition access.

For multiple users scrambled by the same TC-RNTI, if the base station demodulates multiple users, the base station needs to solve the problem that one TC-RNTI corresponds to multiple users. The solution here is to perform the corresponding bit flipping of the TC-RNTI to obtain the corresponding TC-RNTI for each user.

The specific process is as follows: First, for multiple users scrambled by the same TC-RNTI, the base station needs to count the number of demodulated users, and the number of equal segments and the number of added bits of the TC-RNTI, and increase The number of bits is the same as the number of equal segments of the TC-RNTI and corresponds one-to-one; then, the base station needs to determine the value of the added bit, this step can be seen in FIG. 6; finally, the base station performs TC-RNTI according to the determined bit value. The bit is inverted, and it is determined whether the TC-RNTI after the bit flipping conflicts with the TC-RNTI of other users.

6 is a flow chart of determining the value of the added bit by the base station side, and FIG. 6 is a method for determining the added bit according to the number of demodulated users and the situation after the corresponding sequence segment bit of the TC-RNTI is inverted. Flowchart of values. The core of this step is to ensure that the TC-RNTI after the bit value is inverted is different from the TC-RNTI of other users.

The flow shown in FIG. 6 includes the following steps: First, the initial value of the added bit is all 0s, and the bit is in one-to-one correspondence with the TC-RNTI halved sequence segment. When the bit value is 1, The sequence segment corresponding to the TC-RNTI is bit-flipped, and the rule of inversion is: changing 0 to 1 and changing 1 to 0; when the value of the bit is 0, the sequence segment corresponding to the TC-RNTI is not bit-flipped Then, it is determined whether the TC-RNTI after the bit flip is the same as the TC-RNTI of other users. If they are the same, then the original bit value needs to be increased by 1, and it is judged whether the value after the addition exceeds the limit; if the TC after the flipover - The RNTI is different from other users, and the inverted TC-RNTI is available.

FIG. 7 is a flow chart of the improved improved MSG4 on the terminal side. As shown in FIG. 7, after receiving the modified MSG4, the terminal judges the value of the added bit. If the added bit value is all 0, the TC-RNTI does not need to be bit-turned; if the added bit value is not detected, If it is 0, then the corresponding bit flip of the TC-RNTI needs to be performed according to the bit value, and the inverted TC-RNTI is promoted to the C-RNTI.

The present disclosure is described below in conjunction with specific embodiments:

Among them, Embodiments 1, 2, and 3 are processes of MSG3, and Embodiments 4, 5, and 6 are processes of MSG4.

Example 1

MSG3: The MSG3 data transmitted by the terminal for the first time can be successfully demodulated by the base station.

The terminal acquires TC-RNTI information from the received RAR data. In the initial random access technology of the LTE, the MSG3 is data that contains the UE ID and is scrambled using the TC-RNTI.

It is assumed that the signals S = [s ₁ s ₂ s ₃ ... s _n ] and K = [k ₁ k ₂ k ₃ ... ... k _m ] are the MSG3 data in LTE of two users scrambled using the same TC-RNTI, wherein n, m represents the number of symbols contained in one frame.

A sequence in an orthogonal sequence set uses a 4-long orthogonal sequence, such as an orthogonal sequence set:

Assuming that h _i , h _j are orthogonal sequences randomly selected by two users from H, respectively, the improved MSG3 data are h _i ×S, h _j ×K, respectively.

Assuming that the channel is ideal, the data received by the base station side can be expressed as:

W=h _i ×S+h _j ×K

Let w _q be any column of W, then w _q =h _i ·s _q +h _j ·k _q .

The base station blindly detects the received improved MSG3 data from a random selection sequence of the same orthogonal sequence set.

If the orthogonal sequence randomly selected by the base station is h _i , then ∑(h _i ·w _q )=4s _q , and if the value is greater than a predetermined threshold (the predetermined threshold is determined by the demodulation threshold), the orthogonal sequence is sequentially used The remaining symbols of S are detected so that the signal S is demodulated by the base station.

As shown in FIG. 4, if the base station demodulates the signal S of the user, the signal of the other user is no longer detected. At this time, one TC-RNTI corresponds to one user, and the UE ID of the user may be included in the MSG4. And issued to the user.

If the base station demodulates the signal of the user, the selected MSG3 data is blindly detected from the randomly selected sequence in the remaining orthogonal sequence of H (not previously detected), and the detection principle is the same as the first one. the same user detection principle, it is bound to the selected sequence h _j, then the other user signal K will also be demodulated.

For a TC-RNTI corresponding to a plurality of demodulated users, the description of the related processes is performed in Embodiments 4, 5, and 6.

Example 2

MSG3: The MSG3 data transmitted by the terminal before is not successfully demodulated by the base station, the terminal retransmits the MSG3 data, and each retransmission of each terminal is extended by the same orthogonal sequence.

Assumed that the signal _{_{E = [e 1 e 2 e}} 3 ...... e n] and _{_{R = [r 1 r 2 r}} 3 ...... r m] is to be retransmitted with the same TC-RNTI two scrambled user LTE Medium MSG3 data, where n and m represent the number of symbols contained in one frame.

The terminal uses the same orthogonal sequence as the previous transmission, and no longer randomly selects an orthogonal sequence from the orthogonal sequence set. Assuming that the orthogonal sequences used by the two users in the previous transmission are h _i and h _j , respectively, the improved MSG3 data are h _i ×E, h _j ×R, respectively.

Assuming that the channel is an ideal channel, the data received by the base station can be expressed as:

U=h _i ×E+h _j ×R

Let u _q be any column of U, then u _q =h _i ·e _q +h _j ·r _q .

Since the terminal uses the same orthogonal sequence for data expansion each time it retransmits, the base station has two options for improving the MSG3 data detection:

plan 1:

The base station uses the same orthogonal sequence feature for each retransmission of the terminal to reduce the detection complexity of the base station:

If in the previous transmission, the sequence h _i selected by the base station may cause ∑(h _i ·u _q )=4eq to reach a predetermined threshold, that is, in the previous transmission, the orthogonal sequence selected by the base station is valid, then The base station can detect the received signal using the same orthogonal sequence h _i at the time of retransmission without blind detection of the improved MSG3 data.

However, if the base station does not obtain a valid h _i in the previous transmission, then in this transmission, the base station can only blindly detect the improved MSG3 data to obtain ∑(h _i ·u _q )=4e _q effective predetermined threshold h _i.

Scenario 2:

The base station performs blind detection on each received improved MSG3 data without depending on whether the terminal uses the same orthogonal sequence in each retransmission:

The detection process of the MSG3 by the base station is as follows:

If the orthogonal sequence randomly selected by the base station is h _i , then ∑(h _i ·u _q )=4e _q , and if the value is greater than a predetermined threshold, the remaining symbols e ₂ e ₃ are sequentially detected by the orthogonal sequence. ...e _n , whereby the signal E is demodulated by the base station.

If the base station demodulates the signal E of the user and does not detect other users, in this case, one TC-RNTI corresponds to one user, and the UE ID of the user may be included in the MSG4 and sent to the user.

If the base station demodulates the signal of the user, the selected MSG3 data is blindly detected from the randomly selected sequence in the remaining orthogonal sequence of H (not previously detected), and the detection principle is the same as the first one. The principle of user detection is the same, then the sequence h _j will be selected, and the signal R of another user will also be demodulated.

A description of related processes is performed in Embodiments 4, 5, and 6 for a TC-RNTI corresponding to a plurality of demodulated users.

Example 3

MSG3: The MSG3 data transmitted by the terminal before is not successfully demodulated by the base station, and the terminal retransmits the MSG3 data, and each retransmission of each terminal is extended by using different orthogonal sequences.

It is assumed that the signals E = [e ₁ e ₂ e ₃ ... e _n ] and R = [r ₁ r ₂ r ₃ ... ... r _m ] are LTE of two users that need to be retransmitted and have the same TC-RNTI scrambling Medium MSG3 data, where n and m represent the number of symbols contained in one frame.

Each time the terminal retransmits, an orthogonal sequence is randomly selected from the orthogonal sequence set, that is, the orthogonal sequence used by each user for each retransmission is different.

It is assumed that the signals E = [e ₁ e ₂ e ₃ ... e _n ] and R = [r ₁ r ₂ r ₃ ... ... r _m ] are LTE of two users that need to be retransmitted and scrambled using the same TC-RNTI Medium MSG3 data, where n and m represent the number of symbols contained in one frame.

Let h _x and h _y be orthogonal sequences randomly selected by two users from H, respectively, and the improved MSG3 data are h _x ×E, h _y ×R, respectively.

U=h _x ×E+h _y ×R

Let u _q be any column in U, then u _q =h _x ·e _q +h _y ·r _q .

Since the terminal uses an orthogonal sequence that is different from the previous transmission, the base station can only perform blind detection on the improved MSG3 data for each retransmission.

which is:

If the orthogonal sequence randomly selected by the base station is h _x , then ∑(h _x ·u _q )=4e _q , if the value is greater than a predetermined threshold, the orthogonal symbols are used to sequentially detect the remaining symbols of E, so that the signal E Demodulated by the base station.

If the base station demodulates the signal of the user, the selected MSG3 data is blindly detected from the randomly selected sequence of the remaining orthogonal sequence sets of H (not previously detected), and the detection principle is the same as the first one. The principle of user detection is the same, then the sequence h _y will be selected, and the signal R of another user will also be demodulated.

Example 4

MSG4: One TC-RNTI corresponds to a demodulated user.

For multi-user signals scrambled using the same TC-RNTI, if the base station blindly detects the received improved MSG3 data, the base station stops as long as it can demodulate a user's signal. The blind signal is continuously detected on the received signal, and then one TC-RNTI corresponds to one user.

At this time, for the multi-user signal scrambled by the same TC-RNTI, the base station will abandon the demodulation of other users, only to ensure that one user is demodulated, so one TC-RNTI corresponds to one user. Therefore, in this case, the transmission form of the MSG4 in this embodiment is the same as the transmission form of the MSG4 in the LTE contention access technology.

Example 5

MSG4: One TC-RNTI corresponds to multiple demodulated users. And from the perspective of communication efficiency, 4 bits are added here to ensure that conflict problems can be solved for more users.

For multi-user signals scrambled with the same TC-RNTI, if the base station needs to traverse all orthogonal sequences in the orthogonal sequence set when the base station performs blind detection on the received improved MSG3 data, the base station may demodulate For multiple users, one TC-RNTI will correspond to multiple demodulated users.

In order to deal with the problem that a TC-RNTI corresponds to multiple users, the base station needs to add 4 additional bits to the MSG4, and divide the TC-RNTI into 4 segments, and require the 4 sequence segments and the additional 4 bits to be added. One-to-one correspondence, the one-to-one correspondence here is shown in Figure 8:

In Fig. 8, abcd indicates extra added bits. If the additionally added bit value is 1, the corresponding sequence segment is bit flipped; if the additionally added bit value is 0, the corresponding sequence segment will not be bit flipped. Based on this approach, one TC-RNTI can be derived from 16 new TC-RNTI sequences.

In this embodiment, the orthogonal sequence set contains 4 orthogonal sequences, so this also determines that when a collision occurs in the contention access procedure, the base station can demodulate up to 4 users for one TC-RNTI.

The corresponding process of the four users and the 16 new TC-RNTIs can be seen in Figure 6. Here, it is necessary to ensure that the new TC-RNTI cannot be compared with the existing users after the TC-RNTI sequence segment is bit-reversed. The TC-RNTI is the same, otherwise it will cause conflicts.

To avoid the TC-RNTI after the rollover is the same as the TC-RNTI of other existing users, you need to follow the following rules when you need to flip:

First, the initial value of 4 bits is 0000.

Then, the TC-RNTI performs bit flipping of the corresponding sequence segment according to the 0 and 1 values on the 4 bits. This flip refers to turning 0 to 1 and 1 to 0.

Finally, if the new TC-RNTI is the same as the TC-RNTI of other users after the flip, then the value of 4 bits needs to be increased by 1. If the value of 1 after adding 1 is less than 16, the initial TC-RNTI is bit-turned according to the new bit value; if the value after adding 1 is greater than or equal to 16, the base station will abandon the delivery of the user MSG4, and give up. The MSG4 of the user who has not yet allocated a new TC-RNTI under the TC-RNTI is delivered.

The base station is scrambled with the initial TC-RNTI. In order to avoid interference between users scrambled by the same TC-RNTI, the base station needs to send the MSG4 information of each user at different times.

Terminal side:

If the terminal does not obtain information matching the UE ID from the MSG4 within the specified time limit, the terminal considers that the access fails.

If the terminal obtains information matching the UE ID from the MSG4 within the specified time limit, the terminal performs bit flipping on the initial TC-RNTI according to the additionally added 4-bit information, and the flipping rule is the same as that of the base station, that is, 0 flips to 1, and 1 flips to zero. The new TC-RNTI after the rollover is promoted to the C-RNTI, and the conflict resolution of the user is successful.

Example 6

MSG4: One TC-RNTI corresponds to multiple demodulated users. And from the perspective of saving overhead, an additional 2 bits can be added here.

For multi-user signals scrambled with the same TC-RNTI, if the base station needs to traverse all orthogonal sequences in the orthogonal sequence set when the base station performs blind detection on the received improved MSG3 data, the base station may demodulate Multiple users, at this time a TC-RNTI will correspond Multiple demodulated users.

In order to deal with the problem that a TC-RNTI corresponds to multiple users, and at the same time consider saving resource overhead, the base station needs to add 2 additional bits to the MSG4, and divide the TC-RNTI into 2 segments, and request the 2 sequence segments. There is a one-to-one correspondence with the 2 additional bits added, and the one-to-one correspondence here is as shown in FIG. 9:

In Fig. 9, ab indicates extra added bits. If the additionally added bit value is 1, the corresponding sequence segment is bit flipped; if the additionally added bit value is 0, the corresponding sequence segment will not be bit flipped. Based on this method, one TC-RNTI can be derived from four new TC-RNTI sequences.

Since the orthogonal sequence set contains 4 orthogonal sequences in this embodiment, this also determines that when a collision occurs in the contention access procedure, the base station can demodulate up to four users for one TC-RNTI.

The corresponding process of the four users and the four new TC-RNTIs can be seen in Figure 6. Here, it is necessary to ensure that the new TC-RNTI cannot be compared with the existing users after the TC-RNTI sequence segment is bit-reversed. The TC-RNTI is the same, otherwise it will cause conflicts.

For signals of multiple users scrambled by the same TC-RNTI, the base station can successfully demodulate the signals of four users at most, and only four TC-RNTIs are obtained after the base station is flipped (there is no redundant TC-RNTI). In this embodiment, compared with the embodiment 5, the probability that the new TC-RNTI conflicts with other users TC-RNTI after the TC-RNTI is inverted may be greater.

First, the initial value of 4 bits is 0000.

Finally, if the new TC-RNTI is the same as the TC-RNTI of other users after the flip, then the value of 4 bits needs to be increased by 1. If the value of 1 after adding 1 is less than 4, then the initial The TC-RNTI performs bit flip according to the new bit value. If the value added by 1 is greater than or equal to 4, the base station will abandon the delivery of the user MSG4 and abandon the other TC-RNTI that has not been allocated to the TC-RNTI. The user's MSG4 is issued.

Terminal side:

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, portions of the technical solutions of the present disclosure that contribute substantially or to the prior art may be embodied in the form of a software product stored in a storage medium (eg, ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present disclosure.

In this embodiment, a random access device is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and is not described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 10 is a structural block diagram of a first type of contention access apparatus according to an embodiment of the present disclosure, as shown in FIG. 10, the device includes a selection module 102, an expansion module 106, and a transmission module 108, which are described below:

The selecting module 102 is configured to select an orthogonal sequence corresponding to the terminal from the K orthogonal sequences in the terminal access process (for example, in the terminal LTE contention access process), where K is greater than or equal to 2. The integer module is connected to the selection module 102, and is configured to perform an extension process on the MSG3 by using the selected orthogonal sequence. The sending module 108 is connected to the extension module 106 and configured to send the extended MSG3.

In an optional embodiment, the extension module 106 may perform an extension process on the MSG3 by using the selected orthogonal sequence by multiplying the data symbols of the MSG3 with each element of the selected orthogonal sequence, Making each of the data symbols of the MSG3 form a symbol sequence having the same length as the selected orthogonal sequence, that is, the "one" data symbol is expanded by the orthogonal sequence to become the same length as the orthogonal sequence. Symbol sequence.

In an optional embodiment, each of the selected orthogonal sequences takes one of the set {+1, -1}, that is, the value of the element in the selected orthogonal sequence. It can be +1 or -1.

In an optional embodiment, the selecting module 102 may select an orthogonal sequence corresponding to the terminal from the K orthogonal sequences by: in the case of first transmitting the extended MSG3, the extended first transmission The orthogonal sequence corresponding to MSG3 is an orthogonal sequence randomly selected from K orthogonal sequences; and/or, in the case of retransmitting the extended MSG3, the orthogonal sequence corresponding to the retransmitted extended MSG3 is Among the K orthogonal sequences, the same orthogonal sequence as that selected when the extended MSG3 is first transmitted is selected, or one orthogonal sequence is randomly selected from the K orthogonal sequences.

In an optional embodiment, the apparatus further includes a first processing module, configured to: after transmitting the extended MSG3 to the base station, receive the improved MSG4 from the base station, where the base station sends the The information of the terminal; when the terminal is the first time to access the base station, the MSG3 carries the identity information of the terminal, and the base station can use the TC-RNTI to scramble the improved MSG4, when the terminal first accesses the base station. , the terminal can use TC-RNTI The detected improved MSG4 is detected; if the detection result is that the information corresponding to the identification information of the terminal is detected, it is determined that the terminal successfully accesses the base station; and/or, the detection result is that the identification information corresponding to the terminal is not detected. The information determines that the terminal does not successfully access the base station;

Alternatively, when the terminal is connected for reestablishment (that is, when the terminal is reestablishing the connection with the base station), the MSG3 includes the C-RNTI information of the terminal (the C-RNTI may be determined when the terminal first accesses the base station), and the base station may The MSG4 is scrambled by using the C-RNTI. When the terminal is reconnected, the terminal can use the C-RNTI to detect the improved MSG4. When the detection result is that the improved MSG4 is C-RNTI. When scrambling, it is determined that the terminal successfully accesses the base station; and/or, when the detection result is that the improved MSG4 is scrambled by the C-RNTI, it is determined that the terminal does not successfully access the base station.

In an optional embodiment, when the terminal is initially accessing the base station, the first processing module is further configured to: when determining that the terminal successfully accesses the base station, determine, according to the improved MSG4, the temporary identifier of the cell wireless network allocated by the base station. C-RNTI.

In an optional embodiment, the first processing module may determine, according to the improved MSG4, a cell radio network temporary identifier C-RNTI allocated by the base station by: obtaining an improved terminal corresponding to the terminal added by the base station in the improved MSG4. M bits, where M is an integer greater than or equal to 0; dividing the TC-RNTI into M segments, wherein the M segments are in one-to-one correspondence with M bits; respectively, the M segments are respectively performed according to the values of the M bits Flipping; determining the C-RNTI based on the inversion result of the above TC-RNTI.

In an optional embodiment, the first processing module may perform the inversion of the M segments according to the values of the M bits in the following manner: the TC-RNTI segments corresponding to the bits with the bit value of 1 are 0 and 1 The TC-RNTI segment corresponding to the bit with a bit value of 0 is not inverted; or the TC-RNTI segment corresponding to the bit with a bit value of 0 is inverted between 0 and 1, and the bit with a bit value of 1 corresponds to The TC-RNTI segment is not flipped.

11 is a structural block diagram of a second contention access device according to an embodiment of the present disclosure. As shown in FIG. 11, the device includes a receiving module 112, a demodulation module 114, and a control module 116, which are described below.

The receiving module 112 is configured to receive the extended MSG3 from the terminal, where the extended MSG3 is obtained by the terminal performing the extended processing on the MSG3 by using the selected orthogonal sequence, where the selected orthogonal sequence is the terminal in the access process. (For example, the terminal is in the LTE contention access process), the orthogonal sequence corresponding to the terminal selected from the K orthogonal sequences, K is an integer greater than or equal to 2; the demodulation module 114 is connected to the receiving module 112, The method is configured to demodulate the extended MSG3; the control module 116 is connected to the demodulation module 114, and is configured to control the terminal access base station according to the demodulation result.

In an optional embodiment, the demodulation module 114 may perform demodulation on the extended MSG3 by randomly selecting an orthogonal sequence from the K orthogonal sequences to perform blind detection on the extended MSG3. The blind detection includes the following processing: performing correlation operations on each of the K orthogonal sequences and the received extended MSG3 data; the result of the correlation operation is that the extended MG3 is demodulated and decoded successfully. Then, the blind detection succeeds, that is, the demodulation terminal is determined to be successful, and/or, if the result of the correlation operation is demodulation decoding failure, it is determined that the demodulation terminal fails. The orthogonal sequence set used by the base station side for performing the blind detection should be the same as the orthogonal sequence set used when the terminal side performs the extension processing.

In an optional embodiment, the foregoing control module 116 can control the terminal accessing the base station by: after demodulating the terminal, determining whether all the terminals that have been successfully demodulated have the same scrambling mode as the terminal. If the terminal is a connection re-establishment (that is, when reestablishing the connection with the base station), the MSG3 contains the C-RNTI information of the terminal, and the base station can use the C-RNTI pair to improve. The MSG4 is scrambled. The improved MSG4 is an MSG4 message with a predetermined number of bits added. Alternatively, the terminal is the first time accessing the base station, and the MSG3 carries the identity information of the terminal. The base station can use the TC-RNTI pair to improve. The MSG4 is scrambled, and the improved MSG4 is an MSG4 message with a predetermined number of bits added; the improved MSG4 is sent to the terminal after scrambling, wherein the scrambled improved MSG4 is used for terminal access Base station.

In an optional embodiment, the configuration of the "improved MSG4" appearing in the foregoing embodiment may be determined by the base station by determining: when the total number of the terminal and other terminals is R, determining the terminal Corresponding M bits, wherein the M bits are used by the terminal to invert the acquired TC-RNTI to obtain a C-RNTI for accessing the base station, and the values of the M bits corresponding to different terminals are different, 1≤ R ≤ K, M is an integer greater than or equal to 0, and 2 ^M-1 + ... + 2 ⁰ ≥ R; the improved MSG 4 is determined by adding M bits to the above MSG 4 .

In an optional embodiment, the apparatus further includes a second processing module, configured to: after determining the M bits corresponding to the terminal, divide the TC-RNTI into M segments, where the M segments and the M bits are one Corresponding to; respectively, inverting the M segments according to the values of the M bits; determining the C-RNTI used by the terminal according to the inversion result.

In an optional embodiment, the second processing module may perform the inversion of the M segments according to the values of the M bits in the following manner: the TC-RNTI segments corresponding to the bits with the bit value of 1 are 0 and 1 The TC-RNTI segment corresponding to the bit with a bit value of 0 is not inverted; or the TC-RNTI segment corresponding to the bit with a bit value of 0 is inverted between 0 and 1, and the bit with a bit value of 1 corresponds to The TC-RNTI segment is not flipped.

In an optional embodiment, the foregoing control module 116 may determine M bits corresponding to the terminal by setting a predetermined value for the M bits corresponding to the terminal, and determining that the terminal flips the TC-RNTI according to a predetermined value. Whether the obtained TC-RNTI is the same as the existing TC-RNTI of other terminals; if the judgment result is the same, a data value is added for the predetermined value, and the TC-RNTI of the terminal is again performed according to the value of the new M bits. Flipping, and performing the above-mentioned judging operation and adding operation cyclically until the TC-RNTI of the terminal is different from the existing TC-RNTI of the other terminal, determining that the final determined value is the value of M bits; or, until the terminal The value of the corresponding M bits is the maximum value and the improved MSG4 is sent to the terminal; if the determination result is different, the predetermined value is determined to be the value of the M bits corresponding to the terminal.

In an optional embodiment, the foregoing control module 116 may send the scrambled improved MSG4 to the terminal by: improving the scrambled at different times than sending the improved MSG4 to other terminals. The MSG4 is sent to the terminal.

It should be noted that each of the above modules can be implemented by software or hardware. The latter can be implemented in the following manner, but is not limited thereto: the above modules are all located in the same processor; or, the above modules are respectively located in different processors in any combination.

Embodiments of the present disclosure also provide a storage medium. Optionally, in the embodiment, the storage medium may be configured to store program code for performing the steps in the foregoing method embodiments.

Optionally, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM). A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.

Optionally, in the embodiment, the processor performs the above steps according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

In the embodiment of the present disclosure, when the information sent by the multiple terminals is in conflict, the base station has the capability to successfully demodulate the information of the multiple terminals, and the base station sends the demodulated terminal identification information by using the improved MSG4 information. To the terminal, thereby improving the efficiency of the base station to resolve conflicts.

In general, compared with the random access technology of LTE, the solution in the embodiment of the present disclosure can not only ensure that the base station has a high conflict resolution capability, but also can improve the base station to resolve the conflict when facing random access of a large number of users. The efficiency, which is very effective for machine communication with a high probability of collision.

It will be apparent to those skilled in the art that the various modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the present disclosure is not limited to any special The combination of hardware and software.

The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the disclosure, and various changes and modifications may be made to the present disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure.

Industrial applicability

As described above, the contention access method and apparatus provided by the embodiments of the present disclosure have the following beneficial effects: solving the conflict problem generated when multiple users access the base station at the same time, and improving the collision resolution capability of the base station.

Claims

A competitive access method includes:

In the terminal access process, an orthogonal sequence corresponding to the terminal is selected from the K orthogonal sequences, where K is an integer greater than or equal to 2;

Extending the third message by using the selected orthogonal sequence;

Send the extended third message.
The method of claim 1 wherein expanding the third message with the selected orthogonal sequence comprises:

Separating the data symbols of the third message with each element of the selected orthogonal sequence, respectively, such that each of the data symbols of the third message is formed with the selection The sequence of symbols of the same length of the orthogonal sequence.
The method of claim 1 wherein each element of said selected orthogonal sequence takes a value of set {+1, -1}.
The method of claim 1, wherein selecting an orthogonal sequence corresponding to the terminal from the K orthogonal sequences comprises:

In the case that the extended third message is sent for the first time, the orthogonal sequence corresponding to the extended third message sent for the first time is an orthogonal sequence randomly selected from the K orthogonal sequences. ;and / or,

In the case of retransmitting the extended third message, the orthogonal sequence corresponding to the extended third message is selected from the K orthogonal sequences and after the first transmission is sent. The third message is selected by the same orthogonal sequence of orthogonal sequences, or one orthogonal sequence is randomly selected from the K orthogonal sequences.
The method according to any one of claims 1 to 4, wherein after the extended third message is sent to the base station, the method further comprises:

Receiving an improved fourth message from the base station;

When the terminal is initially accessing the base station, the temporary cell wireless network temporary standard is used. Detecting the received improved fourth message, where the third message carries the identity information of the terminal, the temporary cell, when the terminal accesses the base station for the first time. The wireless network temporary identifier is used by the base station to perform scrambling processing on the improved fourth message;

If the detection result is that the information corresponding to the identification information of the terminal is detected, it is determined that the terminal successfully accesses the base station; and/or, if the detection result is that the information corresponding to the identification information of the terminal is not detected, Determining that the terminal does not successfully access the base station;

or,

The terminal is configured to reestablish the connection with the base station, and then use the cell radio network temporary identifier to detect the received improved fourth message, where the terminal reestablishes the connection with the base station, then the third message The cell radio network temporary identifier information is carried in the cell, and the cell radio network temporary identifier is used by the base station to perform scrambling processing on the improved fourth message;

The detection result is that if the improved fourth message is scrambled by the cell radio network temporary identifier, it is determined that the terminal successfully accesses the base station; and/or, the detection result is that no improvement is detected. The four messages are scrambled by the temporary identifier of the cell radio network, and it is determined that the terminal does not successfully access the base station;

Wherein, the improved fourth message is a fourth message with a predetermined number of bits added.
The method according to claim 5, wherein, when the terminal is initially accessing the base station, after determining that the terminal successfully accesses the base station, the method further includes:

Determining, according to the improved fourth message, a cell radio network temporary identifier allocated by the base station.
The method according to claim 6, wherein determining the cell radio network temporary identifier allocated by the base station according to the improved fourth message comprises:

Obtaining M bits corresponding to the terminal that are additionally added by the base station in the improved fourth message, where M is an integer greater than or equal to 0;

Dividing the temporary cell radio network temporary identifier into M segments, wherein the M segments are in one-to-one correspondence with the M bits;

Performing to flip the M segments according to the values of the M bits;

Determining the cell wireless network temporary identifier according to the inversion result of the temporary cell radio network temporary identifier.
The method of claim 7, wherein respectively flipping the M segments according to values of the M bits comprises:

The temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 1 is inverted between 0 and 1, and the temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 0 is not inverted; or

The temporary cell radio network temporary identifier I segment corresponding to the bit with the bit value of 0 is inverted by 0, and the temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 1 is not inverted.
A competitive access method includes:

Receiving an extended third message from the terminal, where the extended third message is obtained by the terminal expanding the third message by using the selected orthogonal sequence, the selected orthogonal The sequence is an orthogonal sequence corresponding to the terminal selected by the terminal from the K orthogonal sequences in the access process, and K is an integer greater than or equal to 2;

Demodulating the extended third message;

Controlling, by the demodulation result, the terminal accessing the base station.
The method of claim 9 wherein demodulating said extended third message comprises:

Blindly detecting the extended third message by randomly selecting one orthogonal sequence from the K orthogonal sequences, wherein the blind detection comprises the following processing: using each of the K orthogonal sequences A sequence is related to the received third message received;

The result of the correlation operation is that if the extended third message is demodulated and successfully decoded, it is determined that the terminal is successfully demodulated; and/or, if the result of the correlation operation is demodulation decoding failure, the demodulation station is determined. The terminal failed.
The method according to claim 9, wherein controlling the terminal to access the base station according to the demodulation result comprises:

After demodulating the terminal successfully, it is determined whether all terminals that have been demodulated successfully have other terminals that use the same scrambling mode as the terminal;

If the result of the judgment is yes, then perform the following operations:

And the terminal is to re-establish the connection with the base station, and the fourth wireless message is scrambled by using the temporary identifier of the cell radio network, where the terminal reestablishes the connection with the base station, and the third message includes the Decoding the cell wireless network temporary identification information of the terminal;

or,

The terminal accesses the base station for the first time, and then uses the temporary cell radio network temporary identifier to scramble the improved fourth message, where the terminal accesses the base station for the first time, in the third message. Carrying identity information of the terminal;

Sending the improved fourth message after the scrambling to the terminal, where the scrambled improved fourth message is used by the terminal to access the base station;

Wherein, the improved fourth message is a fourth message with a predetermined number of bits added.
The method of claim 11 wherein said improved fourth message is determined by:

The total number of the terminal and the other terminal is R, and then determining M bits corresponding to the terminal, where the M bits are used by the terminal to flip the acquired temporary cell wireless network temporary identifier to Obtaining a temporary identifier of a cell radio network for accessing the base station, and different M bits corresponding to different terminals have different values, 1≤R≤K, M is an integer greater than or equal to 0, and 2 M-1 +... ...+2 0 ≥R;

The improved fourth message is determined by adding the M bits in the fourth message.
The method of claim 12, wherein after determining the M bits corresponding to the terminal, the method further comprises:

Dividing the temporary cell radio network temporary identifier into M segments, wherein the M segments are in one-to-one correspondence with the M bits;

Performing to flip the M segments according to the values of the M bits;

Determining, according to the inversion result, the cell radio network temporary identifier used by the terminal.
The method according to claim 13, wherein respectively flipping the M segments according to values of the M bits comprises:

The temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 1 is flipped between 0 and 1, and the temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 0 is not inverted; or

The temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 0 is inverted between 0 and 1, and the temporary cell radio network temporary identifier segment corresponding to the bit with the bit value of 1 is not inverted.
The method of claim 12, wherein determining the M bits corresponding to the terminal comprises:

Setting a predetermined value for the M bits corresponding to the terminal, and determining the temporary identifier of the temporary cell wireless network obtained by the terminal after the temporary identifier of the temporary cell wireless network is reversed according to the predetermined value, and existing terminals of other terminals Whether the temporary network wireless network temporary identification is the same;

If the result of the determination is the same, a data value is added to the predetermined value, and the temporary cell wireless network temporary identifier of the terminal is flipped again according to the value of the new M bits, and the foregoing determining operation and the adding operation are performed cyclically. Until the temporary cell radio network temporary identity of the terminal is reversed and the temporary cell radio network existing by other terminals is temporarily Determining the value of the M bits is determined by the difference; or, until the value of the M bits corresponding to the terminal is the maximum value, and discarding the improved number to the terminal Four messages;

If the determination result is different, determining that the predetermined value is a value of M bits corresponding to the terminal.
The method of claim 11, wherein transmitting the scrambled improved fourth message to the terminal comprises:

The scrambled improved fourth message is sent to the terminal at a different time than when the improved fourth message is sent to the other terminal.
A competitive access device comprising:

Selecting a module, configured to select an orthogonal sequence corresponding to the terminal from the K orthogonal sequences in the terminal access process, where K is an integer greater than or equal to 2;

An extension module configured to perform extension processing on the third message by using the selected orthogonal sequence;

The sending module is configured to send the extended third message to the base station.
The apparatus of claim 17, wherein the extension module performs an extension process on the third message by using the selected orthogonal sequence as follows:

Separating the data symbols of the third message with each element of the selected orthogonal sequence, respectively, such that each of the data symbols of the third message is formed with the selection The sequence of symbols of the same length of the orthogonal sequence.
The apparatus of claim 17, wherein the selection module selects an orthogonal sequence corresponding to the terminal from the K orthogonal sequences by:

In the case that the extended third message is sent for the first time, the orthogonal sequence corresponding to the extended third message sent for the first time is an orthogonal sequence randomly selected from the K orthogonal sequences. ;and / or,

In the case of retransmitting the extended third message, the orthogonal sequence corresponding to the extended third message is selected from the K orthogonal sequences and after the first transmission is sent. The third message is selected by the same orthogonal sequence of orthogonal sequences, or one orthogonal sequence is randomly selected from the K orthogonal sequences.
A competitive access device comprising:

a receiving module, configured to receive an extended third message from the terminal, where the extended third message is obtained by the terminal expanding the third message by using the selected orthogonal sequence, the selecting The orthogonal sequence is an orthogonal sequence corresponding to the terminal selected by the terminal from the K orthogonal sequences in the access process, and K is an integer greater than or equal to 2;

a demodulation module configured to demodulate the extended third message;

The control module is configured to control the terminal accessing the base station according to the demodulation result.
The apparatus according to claim 20, wherein said demodulation module demodulates said extended third message by:

Blindly detecting the extended third message by randomly selecting one orthogonal sequence from the K orthogonal sequences, wherein the blind detection comprises the following processing: using each of the K orthogonal sequences A sequence is related to the received third message received;

The result of the correlation operation is that if the extended third message is demodulated and successfully decoded, it is determined that the terminal is successfully demodulated; and/or, if the result of the correlation operation is demodulation decoding failure, the demodulation station is determined. The terminal failed.
The apparatus according to claim 20, wherein the control module controls the terminal to access the base station according to the demodulation result by:

After demodulating the terminal successfully, it is determined whether all terminals that have been demodulated successfully have other terminals that use the same scrambling mode as the terminal;

If the result of the judgment is yes, then perform the following operations:

And the terminal is to re-establish the connection with the base station, and the fourth wireless message is scrambled by using the temporary identifier of the cell radio network, where the terminal reestablishes the connection with the base station, and the third message includes the Decoding the cell wireless network temporary identification information of the terminal;

or,

The terminal accesses the base station for the first time, and then uses the temporary cell radio network temporary identifier to scramble the improved fourth message, where the terminal accesses the base station for the first time, in the third message. Carrying identity information of the terminal;

Sending the improved fourth message after the scrambling to the terminal, where the scrambled improved fourth message is used by the terminal to access the base station;

Wherein, the improved fourth message is a fourth message with a predetermined number of bits added.
A storage medium, characterized in that the storage medium comprises a stored program, wherein the program is executed to perform the method of any one of claims 1 to 16.
A processor, wherein the processor is operative to execute a program, wherein the program is executed to perform the method of any one of claims 1 to 16.