A configuration method and device based on two-step random access resource reuse

Abstract

The present invention discloses a configuration method and device based on two-step random access resource multiplexing. The method is applicable to multiple user terminals and includes: configuring a MsgA message, wherein the first part of the MsgA message is used by the user terminal UE to send a selected preamble code through a physical random access channel (PRACH), the preamble code being generated according to a message broadcast by a base station, and the second part is used by the UE to send a randomly selected UEID through a PUSCH; waiting for a random access opportunity (RO), wherein multiple user terminals simultaneously transmit the MsgA message to the base station in one RO; receiving an MsgB message, wherein the MsgB message includes the (UEID, C-RNTI) information of the user terminal, and successfully completing the random access process. The present invention uses a demodulation reference signal (DMRS) to represent the UEID. When the number of users using the same preamble code exceeds a threshold, a retransmission mechanism is triggered to reduce the length of the MsgB message, thereby reducing excessive delay.

Description

Technical Field

[0001] The present invention relates to a configuration method and device based on two-step random access resource multiplexing, belonging to the technical field of wireless communication. Background Art

[0002] Ultra-Reliable and Low-Latency Communication (URLLC) is a key scenario for 5G wireless communications. Its main requirement is that the control plane latency should be less than 10 milliseconds. The control plane latency is defined as the time it takes for a UE in RRC_IDLE mode to switch to RRC_CONNECT. However, due to the bursty nature of URLLC requests, network congestion can easily occur. 3GPP Rel-16 enhances random access, namely two-step random access. By merging the two uplink channels, Msg1 and Msg3, in the original four-step random access into a new MsgA, and merging the two downlink channels, Msg2 and Msg4, into a new MsgB, the entire RACH process is simplified to two steps.

[0003] Existing methods use a demodulation reference signal (DMRS) to represent the UE ID. Due to its collision-free nature, each UE completes the random access process in a single iteration. This method, with only one iteration, allows multiple users to use the same preamble to transmit Msg A. Msg B consists of all (UE ID, C-RNTI) pairs. As more users select the same preamble, the number of (UE ID, C-RNTI) combinations increases, and Msg B becomes longer, wasting time and resources. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a configuration method and device based on two-step random access resource multiplexing, which uses a demodulation reference signal (DMRS) to represent the UE ID. When the number of users using the same preamble exceeds a threshold, a retransmission mechanism is triggered to reduce the length of MsgB, thereby reducing excessive latency.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a configuration method based on two-step random access resource multiplexing, applicable to multiple user terminals, the method comprising:

[0007] Configure the MsgA message. The first part of the MsgA message is used by the user end UE to send the selected preamble code through the physical random access channel PRACH. The preamble code is generated according to the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UEID through the PUSCH.

[0008] Waiting for a random access opportunity (RO), multiple user terminals simultaneously transmit MsgA messages to the base station in one RO. After receiving the MsgA message, the base station detects the preamble part of the received MsgA message; decodes the PUSCH part, selects the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism, and configures the feedback message FallbackRAR for the user terminals that exceed the threshold; and configures the MsgB message, which consists of all (UEID, C-RNTI) pairs and feedback messages, and is sent to each user terminal via PDSCH. The C-RNTI is a dynamic identifier assigned to the UE by the base station;

[0009] Receive the MsgB message, which includes the (UEID, C-RNTI) information of the user terminal, and successfully complete the random access process.

[0010] Furthermore, the MsgA message includes a preamble and a payload.

[0011] Furthermore, a demodulation reference signal DMRS is used to represent the UEID, and the demodulation reference signal DMRS is selected from an orthogonal set.

[0012] Furthermore, when decoding the PUSCH part, the number of UEs using each identical preamble is detected. Assuming the number of UEs with the same preamble is n, the gNB will allocate unique C-RNTIs to c combinations of UEIDs with the same preamble. When n≤N th When c=n 4 , when n>N th When c=N th 4 , N th The maximum number of random access responses made by the base station to the user terminal that selects the same preamble code is given in the decoding order. th The user terminal makes a random access response, and exceeds the threshold N th The user terminals will receive the FallbackRAR message and will retransmit in the next random access opportunity.

[0013] In a second aspect, the present invention provides a configuration method based on two-step random access resource multiplexing, applicable to a base station, the method comprising:

[0014] Receive MsgA messages transmitted simultaneously by multiple user terminals in a single RO and detect the preamble part of the received MsgA messages; the first part of the MsgA message is used by the user terminal UE to send the selected preamble through the physical random access channel PRACH. The preamble is generated based on the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UEID through the PUSCH;

[0015] Decode the PUSCH part and select the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism. The base station configures the feedback message FallbackRAR for the user terminals exceeding the threshold.

[0016] Configure the MsgB message, which consists of all (UEID, C-RNTI) pairs and feedback messages, and send it to each user terminal through PDSCH, so that the user terminal receives the MsgB message and successfully completes the random access process.

[0017] Furthermore, the MsgA message includes a preamble and a payload.

[0018] Furthermore, a demodulation reference signal DMRS is used to represent the UEID, and the demodulation reference signal DMRS is selected from an orthogonal set.

[0019] Furthermore, when decoding the PUSCH part, the number of UEs using each identical preamble is detected. Assuming the number of UEs with the same preamble is n, the gNB will allocate unique C-RNTIs to c combinations of UEIDs with the same preamble. When n≤N th When c=n 4 , when n>N th When c=N th 4 , N th The maximum number of random access responses made by the base station to the user terminal that selects the same preamble code is given in the decoding order. th The user terminal makes a random access response, and exceeds the threshold N th The user terminals will receive the FallbackRAR message and will retransmit in the next random access opportunity.

[0020] In a third aspect, the present invention provides a configuration device based on two-step random access resource multiplexing, applicable to multiple user terminals, the device comprising:

[0021] A user configuration module is used to configure an MsgA message. The first part of the MsgA message is used by the user end UE to send a selected preamble through the physical random access channel PRACH. The preamble is generated according to the message broadcast by the base station, and the second part is used by the UE to send a randomly selected UEID through the PUSCH;

[0022] The user sending module is used to wait for a random access opportunity (RO). Multiple user terminals simultaneously transmit MsgA messages to the base station in one RO, so that after receiving the MsgA message, the base station detects the preamble part of the received MsgA message; decodes the PUSCH part, selects the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism, and the base station configures the feedback message FallbackRAR for the user terminals that exceed the threshold; and configures the MsgB message. The MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and is sent to each user terminal through the PDSCH, where the C-RNTI is a dynamic identifier assigned to the UE by the base station;

[0023] The user receiving module is used to receive the MsgB message, which includes the (UEID, C-RNTI) information of the user terminal and successfully completes the random access process.

[0024] In a fourth aspect, the present invention provides a configuration device based on two-step random access resource multiplexing, applicable to a base station, the device comprising:

[0025] The base station receiving module is used to receive MsgA messages transmitted by multiple user terminals simultaneously in an RO and detect the preamble part of the received MsgA message; the first part of the MsgA message is used by the user terminal UE to send the selected preamble through the physical random access channel PRACH, and the preamble is generated according to the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UEID through the PUSCH;

[0026] The base station feedback module is used to decode the PUSCH part and select the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism. The base station configures the feedback message FallbackRAR for the user terminals that exceed the threshold;

[0027] The base station configuration and sending module is used to configure the MsgB message. The MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and is sent to each user terminal through PDSCH so that the user terminal receives the MsgB message and successfully completes the random access process.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a configuration method and device based on two-step random access resource reuse, which uses DMRS to represent UEID and combines a method of only one iteration with a retransmission method to reduce the length of MsgB, thereby achieving the purpose of reducing delay. Compared with the traditional two-step random access method, multiple users can use the same preamble code for random access, thereby reducing delay. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a two-step random access scenario diagram provided by an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of sending DMRS on PUSCH provided by an embodiment of the present invention;

[0032] Figure 3 1 is a schematic diagram of the time-frequency domain allocation of RAO provided by an embodiment of the present invention;

[0033] Figure 4 This is a two-step random access signaling flow chart using DMRS to represent UEID according to an embodiment of the present invention;

[0034] Figure 5 This is an overall flow chart of random access provided by an embodiment of the present invention;

[0035] Figure 6 1 is a schematic diagram of the average random access delay as the threshold increases according to an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the average random access delay of the new mechanism and the original mechanism provided by an embodiment of the present invention as the number of users increases;

[0037] Figure 8 This is a schematic diagram of the proportion in which the average delay of 10,000 simulations provided by an embodiment of the present invention meets the requirements. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] Example 1

[0040] The configuration method based on two-step random access resource reuse provided in this embodiment specifically involves the following steps:

[0041] Step 1: On the user side, the user selects a two-step random access process.

[0042] Step 2: On the user side, configure the MsgA message. The first part of the MsgA is used by the UE to send the selected preamble code through the PRACH. The preamble code is generated according to the message broadcast by the base station, and the second part (i.e., the payload) is used by the UE to send the randomly selected UEID through the PUSCH.

[0043] Step 3: On the user side, the user waits for a random access opportunity (RO).

[0044] Step 4: On the user side, the user transmits MsgA in the RO;

[0045] Step 5: On the base station side, the base station receives the MsgA message sent from the user side;

[0046] Step 6: On the base station side, detect the preamble part of the received MsgA message;

[0047] Step 7: On the base station side, the PUSCH part is decoded. If the number of users with the same preamble code exceeds the threshold, a retransmission mechanism will be triggered. The base station will feedback a FallbackRAR message to the users exceeding the threshold.

[0048] Step 8: On the base station side, configure MsgB, which consists of all (UEID, C-RNTI) pairs and feedback messages, and send it to the UE via PDSCH.

[0049] Step 9: On the user side, the user receives a MsgB message containing the user's (UEID, C-RNTI) information, indicating that the user has successfully completed the random access process.

[0050] In this embodiment, the application scenario is N ue Users use N p The preamble codes perform random access process at the same time, such as Figure 1 shown.

[0051] In step 2 of this embodiment, a demodulation reference signal (DMRS) is used to represent the UEID. Since the 22 DMRS are also selected from an orthogonal set, multiple DMRS can be sent simultaneously on the same PUSCH without conflict. For simplicity, only 16 of the 22 available DMRS are selected, numbered from 0 to 15. According to the transmission of DMRS, in the proposed design, for a UEID of (123A) 16 For UEs with DMRSs numbered 1, 2, 3, and a, the four DMRSs will be sent to the gNB in the first four symbols of the first and second slots of the dedicated PUSCH, as shown in Figure 2 shown.

[0052] In step 3 of this embodiment, a random access opportunity RO with index 11 is selected, as shown in Table 1, and the initial access starts at time slot 0. The gNB needs to include the frequency domain location of the pre-assigned PUSCH and the mapping from the preamble to the corresponding frequency domain PUSCH location in SIB2. The mapping from the preamble to the PUSCH is one-to-one, and the number of RBs for the entire PUSCH is twice the number of user preambles, as shown in Figure 3 shown.

[0053] Table 1 Random access configuration of preamble format 0

[0054]

[0055] In step 4 of this embodiment, N ue UEs transmit MsgA in one RO at the same time. MsgA consists of a preamble and a payload, and occupies two subframes in the time domain. It takes 2ms for the user to send it.

[0056] In step 7 of this embodiment, the number n of the same preamble codes selected by i (i=1, 2, 3, ...) users is detected. i ,satisfy The length of MSGB is related to the number of (UEIDC-RNTI) combinations. The signaling flow chart is as follows: Figure 4 When n users use the same preamble, the number of combinations is n 4 , the current setting is that the base station can select the same preamble code at most N times each time th The user sends a random access response, and the excess part sends a FallbackRAR message to the UE. The flow chart is as follows Figure 5 shown.

[0057] N th When two users select the same preamble, the time required to transmit MsgB is:

[0058]

[0059] Generally, the time required to transmit MsgB is:

[0060]

[0061] After receiving the FallbackRAR message, the UE needs to wait for the next random access opportunity RO to retransmit Msg A. The time interval Δt between two MsgA transmissions is:

[0062]

[0063] N th The time required for each user to select the same preamble code for one iteration. The ceil() function represents rounding up.

[0064] The number of transmissions required for i users who choose the same preamble is:

[0065]

[0066] The fix() function takes the integer part, and the mod() function takes the remainder. The time required for each user to receive each transmission is:

[0067] T1=TmsgA +T msgB1

[0068] T2=T msgA +T msgB2 +Δt ...

[0070] T n =T msgA +T msgBn +(n-1)Δt

[0071] The total time for all users to select the same preamble is:

[0072]

[0073] The total delay before all users is:

[0074]

[0075] The average delay is:

[0076]

[0077] Given the number of users and the number of preambles, use matlab to simulate the threshold N from 1 to N ue The delay simulation diagram is as follows Figure 6 As shown in the figure, different numbers of users use the same number of preamble codes, and it can be concluded that when the threshold N th When =2, the average random access delay is the lowest.

[0078] When N th =2, the number of preamble codes remains unchanged. When the number of users increases from small to large, the average delay of this method, the one-iteration method and the traditional method are compared, as shown in Figure 2. Figure 7 As shown in the figure, it can be seen that the average delay of the method of the present invention is always lower than that of the traditional method. Compared with the single-iteration method, when the number of users is less than or equal to 4, the average delay is basically similar, but as the number of users increases, the average delay of this method is reduced compared with the single-iteration method. Figure 8 As shown, the single-iteration method and this method are simulated 10,000 times, and the number of times the average delay is less than 10ms is counted. When the number of users exceeds 8, the rate at which the single-iteration method meets the delay requirement decreases, while this method maintains a high rate.

[0079] In summary, the method of contention-based two-step random access resource multiplexing proposed in the present invention combines the retransmission and one-iteration resource multiplexing methods to meet the URLLC delay requirements. In addition, compared with the one-iteration method and the traditional method, the average delay of user random access in the method of the present invention is lower.

[0080] Example 2

[0081] This embodiment introduces a configuration method based on two-step random access resource multiplexing, applicable to multiple user terminals, and includes:

[0082] Configure the MsgA message. The first part of the MsgA message is used by the user end UE to send the selected preamble code through the physical random access channel PRACH. The preamble code is generated according to the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UEID through the PUSCH.

[0083] Waiting for a random access opportunity (RO), multiple user terminals simultaneously transmit MsgA messages to the base station in one RO. After receiving the MsgA message, the base station detects the preamble part of the received MsgA message; decodes the PUSCH part, selects the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism, and configures the feedback message FallbackRAR for the user terminals that exceed the threshold; and configures the MsgB message, which consists of all (UEID, C-RNTI) pairs and feedback messages, and is sent to each user terminal via PDSCH. The C-RNTI is a dynamic identifier assigned to the UE by the base station;

[0084] Receive the MsgB message, which includes the (UEID, C-RNTI) information of the user terminal, and successfully complete the random access process.

[0085] Specifically, the MsgA message includes a preamble and a payload.

[0086] Specifically, a demodulation reference signal DMRS is used to represent the UEID, and the demodulation reference signal DMRS is selected from an orthogonal set.

[0087] Specifically, when decoding the PUSCH part, the number of UEs using each identical preamble is detected. Assuming the number of UEs with the same preamble is n, the gNB will allocate unique C-RNTIs to c combinations of UEIDs with the same preamble. When n≤N th When c=n 4 , when n>N th When c=N th 4 , N th The maximum number of random access responses made by the base station to the user terminal that selects the same preamble code is given in the decoding order. th The user terminal makes a random access response, and exceeds the threshold N th The user terminals will receive the FallbackRAR message and will retransmit in the next random access opportunity.

[0088] Example 3

[0089] This embodiment introduces a configuration method based on two-step random access resource reuse, which is applicable to a base station. The method includes:

[0090] Receive MsgA messages transmitted simultaneously by multiple user terminals in a single RO and detect the preamble part of the received MsgA messages; the first part of the MsgA message is used by the user terminal UE to send the selected preamble through the physical random access channel PRACH. The preamble is generated based on the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UEID through the PUSCH;

[0091] Decode the PUSCH part and select the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism. The base station configures the feedback message FallbackRAR for the user terminals exceeding the threshold.

[0092] Configure the MsgB message, which consists of all (UEID, C-RNTI) pairs and feedback messages, and send it to each user terminal through PDSCH, so that the user terminal receives the MsgB message and successfully completes the random access process.

[0093] Specifically, the MsgA message includes a preamble and a payload.

[0094] Specifically, a demodulation reference signal DMRS is used to represent the UEID, and the demodulation reference signal DMRS is selected from an orthogonal set.

[0095] Specifically, when decoding the PUSCH part, the number of UEs using each identical preamble is detected. Assuming the number of UEs with the same preamble is n, the gNB will allocate unique C-RNTIs to c combinations of UEIDs with the same preamble. When n≤N th When c=n 4 , when n>N th When c=N th 4 , N th The maximum number of random access responses made by the base station to the user terminal that selects the same preamble code is given in the decoding order. th The user terminal makes a random access response, and exceeds the threshold N th The user terminals will receive the FallbackRAR message and will retransmit in the next random access opportunity.

[0096] Example 4

[0097] This embodiment introduces a configuration device based on two-step random access resource multiplexing, applicable to multiple user terminals, and includes:

[0098] A user configuration module is used to configure an MsgA message. The first part of the MsgA message is used by the user end UE to send a selected preamble through the physical random access channel PRACH. The preamble is generated according to the message broadcast by the base station, and the second part is used by the UE to send a randomly selected UEID through the PUSCH;

[0099] The user sending module is used to wait for a random access opportunity (RO). Multiple user terminals simultaneously transmit MsgA messages to the base station in one RO, so that after receiving the MsgA message, the base station detects the preamble part of the received MsgA message; decodes the PUSCH part, selects the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism, and the base station configures the feedback message FallbackRAR for the user terminals that exceed the threshold; and configures the MsgB message. The MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and is sent to each user terminal through the PDSCH, where the C-RNTI is a dynamic identifier assigned to the UE by the base station;

[0100] The user receiving module is used to receive the MsgB message, which includes the (UEID, C-RNTI) information of the user terminal and successfully completes the random access process.

[0101] Example 5

[0102] This embodiment introduces a configuration device based on two-step random access resource reuse, which is applicable to a base station. The device includes:

[0103] The base station receiving module is used to receive MsgA messages transmitted by multiple user terminals simultaneously in an RO and detect the preamble part of the received MsgA message; the first part of the MsgA message is used by the user terminal UE to send the selected preamble through the physical random access channel PRACH, and the preamble is generated according to the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UEID through the PUSCH;

[0104] The base station feedback module is used to decode the PUSCH part and select the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism. The base station configures the feedback message FallbackRAR for the user terminals that exceed the threshold;

[0105] The base station configuration and sending module is used to configure the MsgB message. The MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and is sent to each user terminal through PDSCH so that the user terminal receives the MsgB message and successfully completes the random access process.

[0106] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A configuration method based on two-step random access resource reuse, characterized in that: Applicable to multiple user terminals, the method includes: Configure the Msg A message. The first part of the Msg A message is used by the user end UE to send the selected preamble code through the physical random access channel PRACH. The preamble code is generated according to the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UE ID through the PUSCH. Waiting for a random access opportunity (RO), multiple user terminals simultaneously transmit Msg A messages to the base station in one RO, so that the base station detects the preamble part of the received Msg A message after receiving the Msg A message; The PUSCH portion is decoded, and the retransmission mechanism is triggered for the UEs whose number of users with the same preamble exceeds the threshold. The base station configures the feedback message FallbackRAR for the UEs exceeding the threshold. The base station also configures the Msg B message, which consists of all (UE ID, C-RNTI) pairs and the feedback message, and sends it to each UE via the PDSCH. The C-RNTI is a dynamic identifier assigned to the UE by the base station. Receive the Msg B message, which contains the user terminal's (UE ID, C-RNTI) information, and successfully complete the random access process; Wherein, a demodulation reference signal DMRS is used to represent the UE ID, and the demodulation reference signal DMRS is selected from an orthogonal set; When decoding the PUSCH part, the number of UEs using each identical preamble is detected. Let n be the number of UEs with the same preamble. The gNB will allocate unique C-RNTIs to c combinations of UE IDs with the same preamble. When n≤N th When c=n 4 , when n>N th When c=N th 4 , N th The maximum number of random access responses made by the base station to the user terminal that selects the same preamble code is given in the decoding order. th The user terminal makes a random access response, and exceeds the threshold N th The user terminals will receive the FallbackRAR message and will retransmit in the next random access opportunity.

2. The configuration method based on two-step random access resource reuse according to claim 1, characterized in that: The Msg A message includes a preamble and a payload.

3. A configuration method based on two-step random access resource reuse, characterized in that: Applicable to a base station, the method includes: Receive Msg A messages transmitted simultaneously by multiple user terminals in a single RO and detect the preamble part of the received Msg A messages; the first part of the Msg A message is used by the user terminal UE to send the selected preamble through the physical random access channel PRACH. The preamble is generated based on the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UE ID through the PUSCH; Decode the PUSCH part and select the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism. The base station configures the feedback message FallbackRAR for the user terminals exceeding the threshold. Configure the Msg B message, which consists of all (UE ID, C-RNTI) pairs and feedback messages, and send it to each user terminal through PDSCH so that the user terminal receives the Msg B message and successfully completes the random access process; Wherein, a demodulation reference signal DMRS is used to represent the UE ID, and the demodulation reference signal DMRS is selected from an orthogonal set; When decoding the PUSCH part, the number of UEs using each identical preamble is detected. Let n be the number of UEs with the same preamble. The gNB will allocate unique C-RNTIs to c combinations of UE IDs with the same preamble. When n≤N th When c=n 4 , when n>N th When c=N th 4 , N th The maximum number of random access responses made by the base station to the user terminal that selects the same preamble code is given in the decoding order. th The user terminal makes a random access response, and exceeds the threshold N th The user terminals will receive the FallbackRAR message and will retransmit in the next random access opportunity.

4. The configuration method based on two-step random access resource reuse according to claim 3, characterized in that: The Msg A message includes a preamble and a payload.

5. A configuration device based on two-step random access resource multiplexing, adopting the configuration method based on two-step random access resource multiplexing according to claim 1, characterized in that: Applicable to multiple user terminals, the device includes: A user configuration module is used to configure the Msg A message. The first part of the Msg A message is used by the user end UE to send a selected preamble code through the physical random access channel PRACH. The preamble code is generated according to the message broadcast by the base station, and the second part is used by the UE to send a randomly selected UE ID through the PUSCH; The user sending module is used to wait for the random access opportunity (RO). Multiple user terminals simultaneously transmit the Msg A message to the base station in one RO, so that after receiving the Msg A message, the base station detects the preamble part of the received Msg A message; decodes the PUSCH part, selects the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism, and the base station configures the feedback message FallbackRAR for the user terminals that exceed the threshold; and configures the Msg B message. The Msg B message consists of all (UE ID, C-RNTI) pairs and feedback messages, and is sent to each user terminal through the PDSCH, where the C-RNTI is a dynamic identifier assigned to the UE by the base station; The user receiving module is used to receive the Msg B message, which includes the (UEID, C-RNTI) information of the user terminal and successfully completes the random access process.

6. A configuration device based on two-step random access resource multiplexing, adopting the configuration method based on two-step random access resource multiplexing according to claim 3, characterized in that: Applicable to a base station, the device includes: The base station receiving module is used to receive Msg A messages transmitted by multiple user terminals simultaneously in an RO and detect the preamble part of the received Msg A message; the first part of the Msg A message is used by the user terminal UE to send the selected preamble through the physical random access channel PRACH, and the preamble is generated according to the message broadcast by the base station, and the second part is used by the UE to send the randomly selected UE ID through the PUSCH; The base station feedback module is used to decode the PUSCH part and select the user terminals whose number of users with the same preamble exceeds the threshold to trigger the retransmission mechanism. The base station configures the feedback message FallbackRAR for the user terminals that exceed the threshold; The base station configuration and sending module is used to configure the Msg B message. The Msg B message consists of all (UE ID, C-RNTI) pairs and feedback messages, and is sent to each user terminal through PDSCH so that the user terminal receives the Msg B message and successfully completes the random access process.

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