CN111757526A

CN111757526A - Random access method, terminal and network side equipment

Info

Publication number: CN111757526A
Application number: CN201910245347.5A
Authority: CN
Inventors: 吴敏; 卜妍
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-10-09

Abstract

The invention provides a random access method, a terminal and network side equipment, belonging to the technical field of wireless communication, wherein the method applied to the network side equipment comprises the following steps: dividing the plurality of random access preamble codes into a first random access preamble code group and a second random access preamble code group; wherein the random access preamble in the first random access preamble packet is used for a two-step random access procedure and the random access preamble in the second random access preamble packet is used for a four-step random access procedure. In the invention, the random access lead code is divided into two groups, wherein one group is only used for two-step random access process, and the other group is only used for four-step random access process, so that the network side equipment can judge which random access process the terminal needs to carry out when receiving the random access lead code.

Description

Random access method, terminal and network side equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a random access method, a terminal, and a network device.

Background

In the existing protocols, the random access procedure (random access process) is divided into contention-based random access and non-contention-based random access. The four-step random access is that the user terminal sends a random access preamble (Msg 1) to the base station through the time-frequency resource determined by the random access channel configuration index. The user terminal receives a Random Access Response (RAR), namely Msg2, and sends Msg3 through the time-frequency resources specified in the RAR. The user terminal determines whether the random access is successful through contention resolution (Msg 4). If the base station is configured with groupBConfigured, a plurality of random access preamble codes available for contention based grouping can be divided into a random access preamble code group a (random access preamble a) and a random access preamble code group b (random access preamble group b). The user terminal may select one random access preamble belonging to the random access preamble packet a or the random access preamble packet B through the size of the Msg3 and the path loss (pathloss) to perform the random access procedure.

Two-step contention random access (2-step RACH) has been defined, i.e., a user terminal combines the conventional Msg1 and Msg3 into a message a (msga) to be reported to a base station as a first message, and combines the conventional Msg2 and Msg4 into a message b (msgb) to be sent to the user terminal by the base station as a second message. The two-step contention random access message a may include a random access preamble (PRACH preamble) and data (payload) carried by an uplink traffic channel (PUSCH), such as data of Msg3 in the four-step random access.

According to the existing protocol, after receiving a random access preamble sent by a user terminal, a base station cannot judge whether the user terminal selects to perform a four-step random access process or a two-step random access process, so that it cannot determine whether to send a random access response message (RAR) to the user terminal based on the four-step random access process or receive random access related information, such as Msg3 data in the four-step random access, on an uplink traffic channel (PUSCH carried) based on the two-step random access process.

Disclosure of Invention

In view of this, the present invention provides a random access method, a terminal and a network side device, which are used to solve the problem that a base station cannot determine whether a terminal performs a two-step random access process or a four-step random access process after receiving a random access preamble at present.

In order to solve the foregoing technical problem, in a first aspect, the present invention provides a random access method applied to a network side device, including:

dividing a plurality of random access lead codes into a first random access lead code group and a second random access lead code group, so that a terminal selects a group from the first random access lead code group and the second random access lead code group, and selects a random access lead code to be sent from the selected group;

wherein the random access preamble in the first random access preamble packet is used for a two-step random access procedure and the random access preamble in the second random access preamble packet is used for a four-step random access procedure.

Preferably, the first random access preamble packet comprises a first sub-packet and a second sub-packet, and the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

wherein the first sub-packet and the third sub-packet are applied to a random access procedure in a first scenario, and the second sub-packet and the fourth sub-packet are applied to a random access procedure in a second scenario;

in the first scenario, the data volume needing to be transmitted on the PUSCH is greater than a first preset threshold, and the path loss is smaller than a second preset threshold; in the second scenario, the amount of data to be transmitted on the PUSCH is less than or equal to the first preset threshold, or the path loss is greater than or equal to the second preset threshold.

Preferably, after the step of dividing the plurality of random access preamble codes into the first random access preamble code packet and the second random access preamble code packet, the method further includes:

sending configuration information to the terminal, wherein the configuration information comprises: first configuration information for the first sub-packet and/or second configuration information for the second sub-packet; wherein the content of the first and second substances,

the first configuration information includes at least one of:

information for the terminal to calculate a transmission power of a PUSCH used for transmitting random access related information;

information indicating the number of random access preamble codes belonging to the first sub-packet in the random access preamble code corresponding to each SSB;

determining, by the terminal, whether to use data amount threshold information of the first subpacket;

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

information for the terminal to calculate a transmission power of a PUSCH used for transmitting random access procedure related information;

and information indicating the number of random access preamble codes belonging to the second sub-packet in the random access preamble code corresponding to each SSB.

receiving a random access preamble;

determining whether a received random access preamble belongs to the first random access preamble packet;

and if the received random access preamble belongs to the first random access preamble group, receiving information related to random access on a PUSCH corresponding to the received random access preamble.

Preferably, the random access related information includes identification information of the random access preamble;

after the step of receiving the random access related information on the PUSCH corresponding to the received random access preamble, the method further includes:

and determining a random access preamble corresponding to the information related to the random access according to the identification information.

In a second aspect, the present invention further provides a random access method, applied to a network side device, including:

sending configuration information for a first random access preamble packet to a terminal, wherein the first random access preamble packet comprises a part of random access preambles of the network side equipment, and the random access preambles in the first random access preamble packet are used for a two-step random access process; the configuration information includes at least one of:

information indicating the number of random access preamble codes belonging to the first random access preamble code group in the random access preamble code corresponding to each SSB;

data volume threshold information for the terminal to determine a random access preamble;

information indicating a power offset for the first random access preamble packet selection.

Preferably, the first random access preamble packet comprises a first sub-packet and a second sub-packet; the configuration information includes: first configuration information for a first sub-packet, and/or second configuration information for a second sub-packet;

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

In a third aspect, the present invention further provides a random access method, applied to a network side device, including:

receiving a random access preamble;

determining whether the received random access preamble belongs to a first random access preamble group or a second random access preamble group, the random access preambles of the first random access preamble group being used for only a two-step random access procedure and the random access preambles of the second random access preamble group being used for only a four-step random access procedure;

Preferably, the random access related information includes identification information of a random access preamble;

In a fourth aspect, the present invention further provides a random access method, applied to a network side device, including:

receiving a random access preamble;

receiving information related to random access, wherein the information related to random access comprises identification information of a random access lead code;

In a fifth aspect, the present invention further provides a random access method, applied to a terminal, including:

selecting a packet from the first random access preamble packet and the second random access preamble packet;

selecting a random access preamble from the selected packet;

In a sixth aspect, the present invention further provides a random access method, applied to a terminal, including:

determining a random access lead code to be sent;

and sending the random access preamble to be sent to network side equipment, and sending random access related information to the network side equipment through a PUSCH corresponding to the random access preamble to be sent, wherein the random access related information comprises identification information of the random access preamble to be sent.

In a seventh aspect, the present invention further provides a random access method, applied to a terminal, including:

determining a random access lead code to be sent;

and sending the random access preamble to be sent to network side equipment, and sending random access related information to the network side equipment through a PUSCH corresponding to the random access preamble to be sent, wherein the random access related information comprises identification information of the random access preamble to be sent, and the identification information is carried by an MAC CE.

In an eighth aspect, the present invention further provides a network side device, including:

a processor, configured to divide a plurality of random access preamble codes into a first random access preamble code packet and a second random access preamble code packet, so that a terminal selects a packet from the first random access preamble code packet and the second random access preamble code packet, and selects a random access preamble code to be transmitted from the selected packet;

Preferably, the network side device further includes:

a transceiver configured to send configuration information to the terminal, the configuration information including: first configuration information for the first sub-packet and/or second configuration information for the second sub-packet; wherein the content of the first and second substances,

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

Preferably, the network side device further includes: a transceiver for receiving a random access preamble;

the processor is configured to determine whether a received random access preamble belongs to the first random access preamble packet;

the transceiver is further configured to receive random access related information on a PUSCH corresponding to the received random access preamble if the received random access preamble belongs to the first random access preamble group.

the processor is further configured to determine a random access preamble corresponding to the information related to random access according to the identification information.

In a ninth aspect, the present invention further provides a network side device, including:

a transceiver, configured to transmit configuration information for a first random access preamble packet to a terminal, where the first random access preamble packet includes a part of a random access preamble of the network side device, and a random access preamble in the first random access preamble packet is used for a two-step random access procedure; the configuration information includes at least one of:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

In a tenth aspect, the present invention further provides a network side device, including:

a transceiver for receiving a random access preamble;

a processor configured to determine whether a received random access preamble belongs to a first random access preamble group or a second random access preamble group, wherein random access preambles of the first random access preamble group are all used for only a two-step random access procedure and random access preambles of the second random access preamble group are all used for only a four-step random access procedure;

In an eleventh aspect, the present invention further provides a network side device, including:

a transceiver for receiving a random access preamble; receiving information related to random access, wherein the information related to random access comprises identification information of a random access lead code;

and the processor is used for determining a random access preamble corresponding to the information related to the random access according to the identification information.

In a twelfth aspect, the present invention further provides a terminal, including:

a processor for selecting a packet from the first random access preamble packet and the second random access preamble packet; selecting a random access preamble from the selected packet;

In a thirteenth aspect, the present invention further provides a terminal, including:

a processor, configured to determine a random access preamble to be sent;

and the transceiver is used for sending the random access preamble to be sent to network side equipment and sending information related to random access to the network side equipment through a PUSCH corresponding to the random access preamble to be sent, wherein the information related to random access comprises identification information of the random access preamble to be sent.

In a fourteenth aspect, the present invention further provides a terminal, including:

a processor, configured to determine a random access preamble to be sent;

and the transceiver is used for sending the random access preamble to be sent to network side equipment and sending information related to random access to the network side equipment through a PUSCH corresponding to the random access preamble to be sent, wherein the information related to random access comprises identification information of the random access preamble to be sent, and the identification information is carried by the MAC CE.

In a fifteenth aspect, the present invention further provides a network-side device, including a memory, a processor, and a computer program stored in the memory and executable on the processor; the processor implements any one of the above random access methods applied to the network side device when executing the computer program.

In a sixteenth aspect, the present invention further provides a terminal, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor; the processor implements any of the above random access methods applied to the terminal when executing the computer program.

In a seventeenth aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the random access methods described above.

The technical scheme of the invention has the following beneficial effects:

in the embodiment of the invention, the random access preamble code is divided into two groups, wherein one group is only used for two-step random access process, and the other group is only used for four-step random access process, so that the network side equipment can judge which random access process the terminal needs to perform when receiving the random access preamble code.

Drawings

Fig. 1 is a flowchart illustrating a random access method according to a first embodiment of the present invention;

fig. 2 is a flowchart illustrating a random access method according to a second embodiment of the present invention;

fig. 3 is a flowchart illustrating a random access method according to a third embodiment of the present invention;

fig. 4 is a flowchart illustrating a random access method according to a fourth embodiment of the present invention;

fig. 5 is a flowchart illustrating a random access method according to a fifth embodiment of the present invention;

fig. 6 is a flowchart illustrating a terminal selecting a random access preamble according to a fifth embodiment of the present invention;

fig. 7 is a flowchart illustrating a random access method according to a sixth embodiment of the present invention;

fig. 8 is a flowchart illustrating a random access method according to a seventh embodiment of the present invention;

fig. 9 is a schematic format diagram of a MAC CE carrying RAPID according to a seventh embodiment of the present invention;

fig. 10 is a schematic structural diagram of a network-side device in an eighth embodiment of the present invention;

fig. 11 is a schematic structural diagram of a network-side device in a ninth embodiment of the present invention;

fig. 12 is a schematic structural diagram of a network-side device in a tenth embodiment of the present invention;

fig. 13 is a schematic structural diagram of a network-side device in an eleventh embodiment of the present invention;

fig. 14 is a schematic structural diagram of a terminal in a twelfth embodiment of the present invention;

fig. 15 is a schematic structural diagram of a terminal in a thirteenth embodiment of the present invention;

fig. 16 is a schematic structural diagram of a terminal in a fourteenth embodiment of the present invention;

fig. 17 is a schematic structural diagram of a network-side device in a fifteenth embodiment of the present invention;

fig. 18 is a schematic structural diagram of a network-side device according to a sixteenth embodiment of the present invention;

fig. 19 is a schematic structural diagram of a network-side device in a seventeenth embodiment of the present invention;

fig. 20 is a schematic structural diagram of a network-side device in an eighteenth embodiment of the present invention;

fig. 21 is a schematic structural diagram of a terminal in nineteenth embodiment of the present invention;

fig. 22 is a schematic structural diagram of a terminal according to a twentieth embodiment of the present invention;

fig. 23 is a schematic structural diagram of a terminal in twenty-one of the embodiments of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

It should be additionally noted that technical features in the following embodiments of the present invention can be combined to form other embodiments of the present invention.

Referring to fig. 1, fig. 1 is a schematic flow chart of a random access method according to an embodiment of the present invention, where the method is applied to a network side device, and includes the following steps:

step 11: dividing a plurality of random access lead codes into a first random access lead code group and a second random access lead code group, so that a terminal selects a group from the first random access lead code group and the second random access lead code group, and selects a random access lead code to be sent from the selected group;

It should be noted that, after dividing the random access preamble into the first random access preamble packet and the second random access preamble packet, the network side device needs to send the packet information to the terminal, for example, in a broadcast manner or a configuration manner.

In the random access method provided by the embodiment of the invention, the random access preamble is divided into two groups, wherein one group is only used for the two-step random access process, and the other group is only used for the four-step random access process, so that the network side equipment can judge whether the random access process to be performed by the terminal is the four-step random access process or the two-step random access process when receiving the random access preamble.

The random access method described above is exemplified below.

Optionally, the first random access preamble packet includes a first sub-packet and a second sub-packet, and the second random access preamble packet includes a third sub-packet and a fourth sub-packet;

in the first scenario, the amount of data that needs to be transmitted on a PUSCH (Physical Uplink Shared Channel, also referred to as a Physical Uplink traffic Channel) is greater than a first preset threshold, and the path loss is smaller than a second preset threshold; in the second scenario, the amount of data to be transmitted on the PUSCH is less than or equal to the first preset threshold, or the path loss is greater than or equal to the second preset threshold.

That is, the first subpacket and the third subpacket are applied to a case where the amount of data to be transmitted on the PUSCH is large and the path loss is small, and the second subpacket and the fourth subpacket are applied to a case where the amount of data to be transmitted on the PUSCH is small or the path loss is small.

The third sub-packet and the fourth sub-packet are a contention-based random access preamble packet b (random access preamble group b) and a random access preamble packet a (random access preamble group a) of the existing protocol, respectively. In the embodiment of the present invention, a third type of contention based random access preamble group c (i.e., the first sub-group) and a fourth type of contention based random access preamble group d (i.e., the second sub-group) are also introduced. In addition, the plurality of random access preamble codes are random access preamble codes which can be used for contention based of the network side device.

Optionally, after the step of dividing the plurality of random access preamble codes into the first random access preamble code group and the second random access preamble code group, the method further includes:

the first configuration information includes at least one of:

information indicating the number of random access preambles belonging to the first sub-packet in a random access preamble corresponding to each SSB (i.e., SS/PBCH Block, Synchronization Signal/physical broadcast Channel Block, Synchronization Signal Block and/or physical broadcast Channel Block, including at least one of PSS (primary Synchronization Signal), SSs (secondary Synchronization Signal) and PBCH (physical broadcast Channel));

the terminal determines whether to use the data volume threshold information of the first sub-packet, that is, the terminal selects whether to use the random access preamble in the first sub-packet according to the data volume threshold;

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

receiving a random access preamble;

Further optionally, the random access related information includes identification information of the random access preamble;

If the terminal does not transmit the time-frequency resource of the Random Access preamble and the time-frequency resource of the PUSCH for transmitting the Random Access related information continuously in the time domain and/or the frequency domain during the two-step Random Access process, the terminal needs to transmit the MsgA in two steps, that is, the terminal transmits the Random Access preamble on the PRACH (Physical Random Access Channel) and transmits the Random Access related information on the PUSCH. Specifically, the random access preamble may be sent first, and then random access related information may be transmitted on the PUSCH. Correspondingly, the network side device needs to detect the random access preamble sent by the terminal and the information transmitted on the PUSCH in two steps, respectively, that is, the network side device detects the random access preamble sent by the terminal on the PRACH, and continues to detect the received data (i.e., the information related to the random access) on the PUSCH. Since there may be a case where the time-frequency resource of one PUSCH corresponds to multiple random access preamble codes, after receiving data, the network side device cannot determine which random access preamble code the data corresponds to.

In the embodiment of the invention, the terminal carries the identification information of the random access lead code sent by the terminal when sending the information related to the random access on the PUSCH. Therefore, when receiving the information related to random access, the network side device may determine the corresponding random access preamble according to the identification information therein, and complete the MsgA reception. In addition, the base station can estimate the TA (Time Alignment) of the terminal according to the random access preamble, thereby improving the estimation accuracy.

Referring to fig. 2, fig. 2 is a flowchart illustrating a random access method according to a second embodiment of the present invention, where the method is applied to a network side device, and includes the following steps:

step 21: sending configuration information for a first random access preamble packet to a terminal, wherein the first random access preamble packet comprises a part of random access preambles of the network side equipment, and the random access preambles in the first random access preamble packet are used for a two-step random access process; the configuration information includes at least one of:

In the embodiment of the invention, after the random access preamble code group only used for the two-step random access process is newly defined, the configuration information of the random access preamble code group is also defined.

Optionally, the first random access preamble packet includes a first sub-packet and a second sub-packet; the configuration information includes: first configuration information for a first sub-packet, and/or second configuration information for a second sub-packet;

the first configuration information includes at least one of:

information used for the terminal to calculate the transmission power of the PUSCH, wherein the PUSCH is used for transmitting random access related information, and the parameter name of the information can be msgA-DeltaPreambleGroupC;

information indicating the number of random access preamble codes belonging to the first sub-packet in the random access preamble code corresponding to each SSB, wherein the parameter name of the information may be numberOfRA-preamblsgroupc;

data amount threshold information for the terminal to determine whether to use the first sub-packet (i.e., the terminal selects whether to use the first sub-packet or the second sub-packet according to the data amount threshold and then selects a random access preamble in the selected sub-packet), where the parameter name of the information may be ra-msgsizegipc (per cell);

information indicating power offset for the first subpacket selection, which may have a parameter name of messagePowerOffsetGroupC;

the second configuration information includes at least one of:

information used for the terminal to calculate the transmission power of the PUSCH, wherein the PUSCH is used for transmitting random access related information, and the parameter name of the information can be msgA-DeltaPreambleGroupD;

and information indicating the number of random access preambles belonging to the second sub-packet in the random access preamble corresponding to each SSB, wherein the parameter name of the information may be numberOfRA-preamblsgroupd.

The first sub-packet is also a random access preamble packet c (random access preamble c), and the second sub-packet is also a random access preamble packet d (random access preamble group pd).

Referring to fig. 3, fig. 3 is a flowchart illustrating a random access method according to a third embodiment of the present invention, where the method is applied to a network side device, and includes the following steps:

step 31: receiving a random access preamble;

step 32: determining whether the received random access preamble belongs to a first random access preamble group or a second random access preamble group, the random access preambles of the first random access preamble group being used for only a two-step random access procedure and the random access preambles of the second random access preamble group being used for only a four-step random access procedure;

step 33: and if the received random access preamble belongs to the first random access preamble group, receiving information related to random access on a PUSCH corresponding to the received random access preamble.

It should be noted that, if it is determined that the received random access preamble belongs to the second random access preamble packet, a RAR message (through a Physical Downlink Shared CHannel (PDSCH)) is sent according to an existing four-step random access procedure, where the RAR message carries time-frequency resource information of Msg3 sent by the terminal.

In addition, the channel for transmitting the random access related information may be a PUSCH, or may be another uplink transmission channel defined in the future and available for transmitting data.

In the embodiment of the invention, after receiving the random access lead code, the network side equipment can determine whether the terminal carries out a four-step random access process or a two-step random access process by judging which group the received random access lead code belongs to.

Optionally, the random access related information includes identification information of a random access preamble;

Referring to fig. 4, fig. 4 is a flowchart illustrating a random access method according to a fourth embodiment of the present invention, where the method is applied to a network side device, and includes the following steps:

step 41: receiving a random access preamble;

step 42: receiving information related to random access, wherein the information related to random access comprises identification information of a random access lead code;

step 43: and determining a random access preamble corresponding to the information related to the random access according to the identification information.

Optionally, a Cyclic Redundancy Check (CRC) of the information related to the Random Access is scrambled by an RA-RNTI (Random Access-Radio Network Temporary Identifier for a Random Access). The RA-RNTI is associated with the time-frequency location, carrier ID (identity) of the PRACH in the MsgA.

Further optionally, the identification information is carried by a MAC CE (MAC: Media Access Control, Media Access Control layer; CE: Control Element, Control unit or referred to as Control Element).

In the embodiment of the invention, after detecting the information related to random access sent by the terminal on the PUSCH, the network side equipment firstly checks the CRC, and after the check is passed, the network side equipment starts to analyze the information related to the random access, and determines the corresponding random access preamble through the identification information carried by the MAC CE to form the MsgA.

Referring to fig. 5, fig. 5 is a flowchart illustrating a random access method according to a fifth embodiment of the present invention, where the method is applied to a terminal, and includes the following steps:

step 51: selecting a packet from the first random access preamble packet and the second random access preamble packet;

step 52: selecting a random access preamble from the selected packet;

After the random access preamble is selected, the selected random access preamble is transmitted to the network side device. If the terminal is the random access preamble selected from the first random access preamble group, the terminal needs to send the information related to the random access to the network side device through a time-frequency resource (PUSCH) corresponding to the random access preamble. And waiting for the MsgB sent by the network side equipment within a certain time to detect whether the random access is successful. And if the terminal is the random access preamble selected from the second random access preamble packet, receiving the RAR message (through the PDSCH) sent by the network side equipment, and sending the Msg3 to the network side equipment according to the time-frequency resources specified in the RAR message.

In the embodiment of the invention, in the contention-based random access process, the terminal transmits the information of the terminal to the network side equipment by selecting the random access preamble codes belonging to different random access preamble code groups. Specifically, if the terminal selects one contention-based random access preamble from the first random access preamble group, it indicates that the ue will perform the two-step random access procedure, and if the terminal selects one contention-based random access preamble from the second random access preamble group, it indicates that the ue will perform the four-step random access procedure.

The third sub-packet and the fourth sub-packet are a contention-based random access preamble packet b (random access preamble group b) and a random access preamble packet a (random access preamble group a) of the existing protocol, respectively. The first sub-packet is also a third type of contention based random access preamble packet c (random access preamble group c) introduced in the embodiment of the present invention, and the second sub-packet is also a fourth type of contention based random access preamble packet d (random access preamble group d) introduced in the embodiment of the present invention.

In the embodiment of the present invention, the terminal selects a contention-based random access preamble from the random access preamble packet C, that is, the terminal indicates that the 2-step RACH is to be performed, and data to be transmitted on the PUSCH is large and the path loss is small. The terminal selects a contention-based random access preamble from the random access preamble packet D, which indicates that the user terminal will perform 2-step RACH and that the data to be transmitted on PUSCH is small or the path loss is large. The terminal selects a contention-based random access preamble from the random access preamble packet B, which indicates that the terminal will perform 4-step RACH and that the data to be transmitted on PUSCH is large and the path loss is small. The terminal selects a contention-based random access preamble from the random access preamble packet a, which indicates that the terminal will perform 4-step RACH and that the data to be transmitted on PUSCH is small or the path loss is large.

Specifically, referring to fig. 6, the process of selecting the random access preamble by the terminal is as follows:

step 61: when the random access process is needed, judging whether a two-step random access process or a four-step random access process is needed; if the two-step random access procedure is performed, the procedure proceeds to step 62, and if the four-step random access procedure is performed, the procedure proceeds to step 63.

Step 62: judging whether the data needing to be transmitted on the PUSCH is larger than a data quantity threshold or not, and the path loss is smaller than a path loss threshold; if the data to be transmitted on the PUSCH is greater than the data amount threshold and the path loss is less than the path loss threshold, step 64 is entered, otherwise step 65 is entered.

And step 63: judging whether the data of the Msg3 is larger than a data volume threshold or not and the path loss is smaller than a path loss threshold; if the data of Msg3 is greater than the data volume threshold and the path loss is less than the path loss threshold, go to step 66, otherwise go to step 67.

Step 64: a random access preamble is selected in the random access preamble group C.

Step 65: a random access preamble is selected within the random access preamble packet D.

And step 66: a random access preamble is selected in the random access preamble group B.

Step 67: a random access preamble is selected in the random access preamble group a.

The embodiment of the invention provides a technical scheme which corresponds to the third embodiment and has the same inventive concept.

Referring to fig. 7, fig. 7 is a flowchart illustrating a random access method according to a sixth embodiment of the present invention, where the method is applied to a terminal, and includes the following steps:

step 71: determining a random access lead code to be sent;

step 72: and sending the random access preamble to be sent to network side equipment, and sending random access related information to the network side equipment through a PUSCH corresponding to the random access preamble to be sent, wherein the random access related information comprises identification information of the random access preamble to be sent.

Further optionally, the random access related information may further include terminal identification information for identifying a terminal, such as a C-RNTI (Cell Radio Network Temporary Identifier) or a TMSI (Temporary Mobile Subscriber Identity), for example.

Referring to fig. 8, fig. 8 is a flowchart illustrating a random access method according to a seventh embodiment of the present invention, where the method is applied to a terminal, and includes the following steps:

step 81: determining a random access lead code to be sent;

step 82: and sending the random access preamble to be sent to network side equipment, and sending random access related information to the network side equipment through a PUSCH corresponding to the random access preamble to be sent, wherein the random access related information comprises identification information of the random access preamble to be sent, and the identification information is carried by an MAC CE.

In the embodiment of the present invention, a new MAC CE is defined to carry identification information of a random access preamble, and the format of the MAC CE is shown in fig. 9. Wherein, R is a reserved bit (bit) and can be set to 0. The random access preamble id, i.e. the identification information of the random access preamble, may be 6 bits.

For the identification information, reference may be made specifically to the sixth embodiment described above.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a network-side device according to an eighth embodiment of the present invention, where the network-side device 100 includes:

a processor 101, configured to divide a plurality of random access preamble codes into a first random access preamble code packet and a second random access preamble code packet, so that a terminal selects a packet from the first random access preamble code packet and the second random access preamble code packet, and selects a random access preamble code to be sent from the selected packet;

Optionally, the network-side device 100 further includes:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

Optionally, the network side device further includes: a transceiver for receiving a random access preamble;

the processor 101 is configured to determine whether the received random access preamble belongs to the first random access preamble packet;

Optionally, the random access related information includes identification information of the random access preamble;

the processor 101 is further configured to determine, according to the identification information, a random access preamble corresponding to the information related to random access.

The embodiment of the present invention is a product embodiment corresponding to the above method embodiment, and therefore, detailed description is omitted here, and please refer to the first embodiment in detail.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a network-side device according to a ninth embodiment of the present invention, where the network-side device 110 includes:

a transceiver 111, configured to transmit configuration information for a first random access preamble packet to a terminal, where the first random access preamble packet includes a part of a random access preamble of the network side device, and a random access preamble in the first random access preamble packet is used for a two-step random access procedure; the configuration information includes at least one of:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

The embodiment of the present invention is a product embodiment corresponding to the above method embodiment, and therefore, detailed description is omitted here, and please refer to the second embodiment.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a network-side device according to a tenth embodiment of the present invention, where the network-side device 120 includes:

a transceiver 121 for receiving a random access preamble;

a processor 122 configured to determine whether the received random access preamble belongs to a first random access preamble group or a second random access preamble group, wherein the random access preambles of the first random access preamble group are both used for the two-step random access procedure only, and the random access preambles of the second random access preamble group are both used for the four-step random access procedure only;

the transceiver 121 is further configured to receive random access related information on a PUSCH corresponding to the received random access preamble if the received random access preamble belongs to the first random access preamble group.

the processor 122 is further configured to determine a random access preamble corresponding to the random access related information according to the identification information.

The embodiment of the present invention is a product embodiment corresponding to the third embodiment of the method, and therefore, detailed description is omitted here, and please refer to the third embodiment.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a network-side device according to an eleventh embodiment of the present invention, where the network-side device 130 includes:

a transceiver 131 for receiving a random access preamble; receiving information related to random access, wherein the information related to random access comprises identification information of a random access lead code;

a processor 132, configured to determine, according to the identification information, a random access preamble corresponding to the random access related information.

The embodiment of the present invention is a product embodiment corresponding to the fourth embodiment of the method, and therefore, details are not repeated here, and please refer to the fourth embodiment in detail.

Referring to fig. 14, fig. 14 is a schematic structural diagram of a terminal according to a twelfth embodiment of the present invention, where the terminal 140 includes:

a processor 141 for selecting a packet from the first random access preamble packet and the second random access preamble packet; selecting a random access preamble from the selected packet;

The embodiment of the present invention is a product embodiment corresponding to the fifth embodiment of the method, and therefore, details are not repeated here, and please refer to the fifth embodiment in detail.

Referring to fig. 15, fig. 15 is a schematic structural diagram of a terminal according to a thirteenth embodiment of the present invention, where the terminal 150 includes:

a processor 151 configured to determine a random access preamble to be transmitted;

the transceiver 152 is configured to send the random access preamble to be sent to a network side device, and send information related to random access to the network side device through a PUSCH corresponding to the random access preamble to be sent, where the information related to random access includes identification information of the random access preamble to be sent.

The embodiment of the present invention is a product embodiment corresponding to the sixth embodiment of the method, and therefore, details are not described herein, and please refer to the sixth embodiment.

Referring to fig. 16, fig. 16 is a schematic structural diagram of a terminal according to a fourteenth embodiment of the present invention, where the terminal 160 includes:

a processor 161 configured to determine a random access preamble to be sent;

the transceiver 162 is configured to send the random access preamble to be sent to a network side device, and send information related to random access to the network side device through a PUSCH corresponding to the random access preamble to be sent, where the information related to random access includes identification information of the random access preamble to be sent, and the identification information is carried by the MACCE.

The embodiment of the present invention is a product embodiment corresponding to the seventh embodiment of the method, and therefore, details are not repeated here, and please refer to the seventh embodiment in detail.

Referring to fig. 17, fig. 17 is a schematic structural diagram of a network-side device according to a fifteenth embodiment of the present invention, where the network-side device 170 includes a processor 171, a memory 172, and a computer program stored in the memory 172 and capable of running on the processor 171; the processor 171, when executing the computer program, implements the steps of:

Optionally, the processor 171, when executing the computer program, may further implement the following steps:

after the step of dividing the plurality of random access preamble codes into the first random access preamble code group and the second random access preamble code group, the method further comprises:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

receiving a random access preamble;

Optionally, the random access related information includes identification information of the random access preamble; the processor 171, when executing the computer program, may further implement the following steps:

The specific working process of the embodiment of the present invention is the same as that of the first embodiment of the method, and therefore, detailed description is not repeated here, and please refer to the description of the method steps in the first embodiment.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a network-side device according to a sixteenth embodiment of the present invention, where the network-side device 180 includes a processor 181, a memory 182, and a computer program stored in the memory 182 and capable of running on the processor 181; the processor 181, when executing the computer program, implements the following steps:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

The specific working process of the embodiment of the present invention is the same as that of the second embodiment of the method, and therefore, the detailed description thereof is omitted, and refer to the description of the method steps in the second embodiment.

Referring to fig. 19, fig. 19 is a schematic structural diagram of a network-side device 190 according to a seventeenth embodiment of the present invention, where the network-side device 190 includes a processor 191, a memory 192, and a computer program stored in the memory 192 and capable of running on the processor 191; the processor 191, when executing the computer program, performs the steps of:

receiving a random access preamble;

Optionally, the random access related information includes identification information of a random access preamble; the processor 191, when executing the computer program, may further perform the following steps:

The specific working process of the embodiment of the present invention is the same as that of the third embodiment of the method, and therefore, the detailed description thereof is omitted, and please refer to the description of the method steps in the third embodiment.

Referring to fig. 20, fig. 20 is a schematic structural diagram of a network-side device 200 according to an eighteenth embodiment of the present invention, where the network-side device 200 includes a processor 201, a memory 202, and a computer program stored in the memory 202 and capable of running on the processor 201; the processor 201, when executing the computer program, implements the following steps:

receiving a random access preamble;

The specific working process of the embodiment of the present invention is the same as that of the fourth embodiment of the method, and therefore, the detailed description thereof is omitted, and please refer to the description of the method steps in the fourth embodiment.

Referring to fig. 21, fig. 21 is a schematic structural diagram of a terminal according to nineteenth embodiment of the present invention, where the terminal 210 includes a processor 211, a memory 212, and a computer program stored in the memory 212 and capable of running on the processor 211; the processor 211, when executing the computer program, implements the steps of:

selecting a random access preamble from the selected packet;

The specific working process of the embodiment of the present invention is the same as that of the fifth embodiment of the method, and therefore, detailed description is not repeated here, and please refer to the description of the method steps in the fifth embodiment.

Referring to fig. 22, fig. 22 is a schematic structural diagram of a terminal according to a twenty embodiment of the present invention, where the terminal 220 includes a processor 221, a memory 222, and a computer program stored in the memory 222 and capable of running on the processor 221; the processor 221, when executing the computer program, implements the following steps:

determining a random access lead code to be sent;

The specific working process of the embodiment of the present invention is the same as that of the sixth embodiment of the method, and therefore, the detailed description thereof is omitted, and please refer to the description of the method steps in the sixth embodiment.

Referring to fig. 23, fig. 23 is a schematic structural diagram of a terminal according to twenty-first embodiment of the present invention, where the terminal 230 includes a processor 231, a memory 232, and a computer program stored in the memory 232 and capable of running on the processor 231; the processor 231, when executing the computer program, implements the steps of:

determining a random access lead code to be sent;

The specific working process of the embodiment of the present invention is the same as that of the seventh embodiment of the method, and therefore, detailed description thereof is omitted, and refer to the description of the method steps in the seventh embodiment.

Twenty-second embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in any one of the random access methods in the first to seventh embodiments. Please refer to the above description of the method steps in the corresponding embodiments.

The network side device in the embodiment of the present invention may be a Base Transceiver Station (BTS) in Global System for mobile communication (GSM) or Code Division Multiple Access (CDMA), may also be a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), may also be an evolved Node B (evolved Node B, eNB or eNodeB) in LTE, or a relay Station or Access point, or a Base Station in a future 5G network, and the like, which is not limited herein.

The terminal in the embodiments of the present invention may be a wireless terminal or a wired terminal, and the wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs) are used. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a Terminal (User device or User Equipment), which are not limited herein.

The computer-readable storage media described above, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A random access method is applied to network side equipment, and is characterized by comprising the following steps:

2. The random access method according to claim 1, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet, and the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

3. The random access method according to claim 2, wherein the step of dividing the plurality of random access preamble codes into the first random access preamble packet and the second random access preamble packet is followed by further comprising:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

4. The random access method of claim 1, wherein the step of dividing the plurality of random access preamble codes into the first random access preamble packet and the second random access preamble packet is followed by:

receiving a random access preamble;

5. The random access method according to claim 4, wherein the random access related information includes identification information of the random access preamble;

6. A random access method is applied to network side equipment, and is characterized by comprising the following steps:

7. The random access method according to claim 6, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet; the configuration information includes: first configuration information for a first sub-packet, and/or second configuration information for a second sub-packet;

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

8. A random access method is applied to network side equipment, and is characterized by comprising the following steps:

receiving a random access preamble;

9. The random access method according to claim 8, wherein the random access related information includes identification information of a random access preamble;

10. The random access method according to claim 8, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet, and the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

11. A random access method is applied to network side equipment, and is characterized by comprising the following steps:

receiving a random access preamble;

12. A random access method applied to a terminal is characterized by comprising the following steps:

selecting a random access preamble from the selected packet;

13. The random access method according to claim 12, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet, and the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

14. A random access method applied to a terminal is characterized by comprising the following steps:

determining a random access lead code to be sent;

15. A random access method applied to a terminal is characterized by comprising the following steps:

determining a random access lead code to be sent;

16. A network-side device, comprising:

17. The network-side device of claim 16, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet, and wherein the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

18. The network-side device of claim 17, further comprising:

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

19. The network-side device of claim 16, further comprising: a transceiver for receiving a random access preamble;

20. The network-side device of claim 19, wherein the random access related information comprises identification information of the random access preamble;

21. A network-side device, comprising:

22. The network-side device of claim 21, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet; the configuration information includes: first configuration information for a first sub-packet, and/or second configuration information for a second sub-packet;

the first configuration information includes at least one of:

information indicating a power offset for the first subpacket selection;

the second configuration information includes at least one of:

23. A network-side device, comprising:

a transceiver for receiving a random access preamble;

24. The network-side device of claim 23, wherein the random access related information comprises identification information of a random access preamble;

25. The network-side device of claim 23, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet, and wherein the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

26. A network-side device, comprising:

27. A terminal, comprising:

28. The terminal of claim 27, wherein the first random access preamble packet comprises a first sub-packet and a second sub-packet, and wherein the second random access preamble packet comprises a third sub-packet and a fourth sub-packet;

29. A terminal, comprising:

a processor, configured to determine a random access preamble to be sent;

30. A terminal, comprising:

a processor, configured to determine a random access preamble to be sent;

31. A network-side device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor; characterized in that the processor implements the random access method according to any of claims 1 to 11 when executing the computer program.

32. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that the processor implements the random access method according to any of claims 12 to 15 when executing the computer program.

33. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the random access method according to any one of claims 1 to 15.