CN116209088A - Configuration method and device based on two-step random access resource multiplexing - Google Patents

Configuration method and device based on two-step random access resource multiplexing Download PDF

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CN116209088A
CN116209088A CN202310041126.2A CN202310041126A CN116209088A CN 116209088 A CN116209088 A CN 116209088A CN 202310041126 A CN202310041126 A CN 202310041126A CN 116209088 A CN116209088 A CN 116209088A
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message
random access
preamble
base station
msga
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张治中
周永东
冯姣
程方
江超
曹丽媛
白若冰
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

The invention discloses a configuration method and a device based on two-step random access resource multiplexing, wherein the method is applicable to a plurality of user terminals, and comprises the following steps: configuring an MsgA message, wherein a first part of the MsgA message is used for a User Equipment (UE) to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second part of the MsgA message is used for the UE to send a randomly selected UEID through a PUSCH; waiting for random access opportunity (RO), and transmitting MsgA messages to a base station in one RO at the same time by a plurality of users; the invention uses demodulation reference signal DMRS to represent UEID, when the number of users using the same preamble exceeds the threshold, a retransmission mechanism is triggered to reduce the length of MsgB, thereby reducing the too high time delay.

Description

Configuration method and device based on two-step random access resource multiplexing
Technical Field
The invention relates to a configuration method and a configuration device based on two-step random access resource multiplexing, and belongs to the technical field of wireless communication.
Background
An Ultra-Reliable and Low-Latency Communication (URLLC) as a key scenario for 5G wireless communication, mainly requires that the control plane delay should be less than 10ms, which is defined as the time when a UE in rrc_idle mode switches to rrc_connect. However, due to burstiness of the URLLC request, network congestion is likely to occur. The 3GPPRel-16 is enhanced by random access, namely two-step random access. By combining the two uplink channels Msg1 and Msg3 in the original four-step random access into a new MsgA and combining the two downlink channels Msg2 and Msg4 into a new MsgB, the whole RACH procedure is simplified to two steps.
The existing method uses demodulation reference signals (DMRS) to represent UE IDs, and each UE completes a random access procedure in one iteration due to its collision-free nature. In the method, after only one iteration, a plurality of users can use the same preamble to transmit Msg A, msg B is composed of all (UE ID, C-RNTI) pairs, when the number of users selecting the same preamble is larger, the number of (UE ID, C-RNTI) combinations is larger, the length of Msg B is longer, and the waste time and resources are larger.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a configuration method and a configuration device based on two-step random access resource multiplexing, wherein demodulation reference signal (DMRS) is used for representing UE ID, and when the number of users using the same preamble exceeds a threshold value, a retransmission mechanism is triggered to reduce the length of MsgB, so that the too high time delay is reduced.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a configuration method based on two-step random access resource multiplexing, which is applicable to a plurality of user terminals, and the method includes:
configuring an MsgA message, wherein a first part of the MsgA message is used for a User Equipment (UE) to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second part of the MsgA message is used for the UE to send a randomly selected UEID through a PUSCH;
waiting for a random access opportunity (RO), transmitting MsgA messages to a base station in one RO by a plurality of user terminals at the same time, so that after the base station receives the MsgA messages, detecting a preamble part in the received MsgA messages; decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station; the method comprises the steps of configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and sending the feedback messages to each user terminal through a PDSCH, wherein the C-RNTI is a dynamic identifier distributed to UE by a base station;
and receiving an MsgB message, wherein the MsgB message contains (UEID, C-RNTI) information of the user terminal, and successfully completing the random access process.
Further, the MsgA message includes a preamble and a payload.
Further, the ue id is represented by a demodulation reference signal DMRS, which is selected from the orthogonal set.
Further, when decoding the PUSCH part, detecting the number of user ends using each same preamble, setting the number of UEs having the same preamble as n, and the gNB will allocate a unique C-RNTI to C combinations of UE ids having the same preamble; when N is less than or equal to N th When c=n 4 When N > N th When c=n th 4 ，N th The maximum number of random access responses for the base station to select the same preamble user terminal is given to N according to the decoding sequence th The individual user terminals make random access responses exceeding the threshold N th The ue receives the fallbackhaul message and retransmits the message at the next random access opportunity.
In a second aspect, the present invention provides a configuration method based on two-step random access resource multiplexing, which is applicable to a base station, and the method includes:
receiving an MsgA message transmitted by a plurality of user terminals in one RO at the same time, and detecting a preamble part in the received MsgA message; wherein a first part of the MsgA message is used for the UE to transmit a selected preamble through the PRACH, the preamble is generated according to the message broadcast by the base station, and a second part is used for the UE to transmit a randomly selected UE id through the PUSCH;
decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station;
and configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and the feedback messages are sent to each user end through a PDSCH (physical downlink shared channel) so that the user end receives the MsgB message and successfully completes the random access process.
Further, the MsgA message includes a preamble and a payload.
Further, the ue id is represented by a demodulation reference signal DMRS, which is selected from the orthogonal set.
Further, when decoding the PUSCH part, detecting the number of user ends using each same preamble, setting the number of UEs having the same preamble as n, and the gNB will allocate a unique C-RNTI to C combinations of UE ids having the same preamble; when N is less than or equal to N th When c=n 4 When N > N th When c=n th 4 ，N th The maximum number of random access responses for the base station to select the same preamble user terminal is given to N according to the decoding sequence th The individual user terminals make random access responses exceeding the threshold N th The ue receives the fallbackhaul message and retransmits the message at the next random access opportunity.
In a third aspect, the present invention provides a configuration device based on two-step random access resource multiplexing, which is applicable to multiple user terminals, and the device includes:
a user configuration module, configured to configure an MsgA message, where a first portion of the MsgA message is used for a user equipment UE to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second portion is used for the UE to send a randomly selected UE id through a PUSCH;
a user sending module, configured to wait for a random access opportunity RO, where multiple user ends transmit MsgA messages to a base station at the same time in one RO, so that after the base station receives the MsgA messages, the base station detects a preamble portion in the received MsgA messages; decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station; the method comprises the steps of configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and sending the feedback messages to each user terminal through a PDSCH, wherein the C-RNTI is a dynamic identifier distributed to UE by a base station;
and the user receiving module is used for receiving the MsgB message, wherein the MsgB message contains the (UEID, C-RNTI) information of the user terminal, and the random access process is successfully completed.
In a fourth aspect, the present invention provides a configuration device based on two-step random access resource multiplexing, which is applicable to a base station, and the device includes:
the base station receiving module is used for receiving the MsgA messages transmitted by a plurality of user terminals in one RO at the same time and detecting a preamble part in the received MsgA messages; wherein a first part of the MsgA message is used for the UE to transmit a selected preamble through the PRACH, the preamble is generated according to the message broadcast by the base station, and a second part is used for the UE to transmit a randomly selected UE id through the PUSCH;
the base station feedback module is used for decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station;
the base station configuration and sending module is used for configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and the MsgB message is sent to each user terminal through a PDSCH, so that the user terminal receives the MsgB message, and the random access process is successfully completed.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a configuration method and a configuration device based on two-step random access resource multiplexing, which use a DMRS to represent a UEID, and combine a retransmission method with a method of only one iteration to reduce the length of MsgB, thereby achieving the purpose of reducing time delay; compared with the two-step random access traditional method, a plurality of users can use the same preamble to carry out random access, thereby reducing time delay.
Drawings
Fig. 1 is a two-step random access scene graph provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of DMRS transmission on PUSCH provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of time-frequency domain allocation of RAO according to an embodiment of the present invention;
fig. 4 is a two-step random access signaling flow chart for representing ue id with DMRS according to an embodiment of the present invention;
fig. 5 is a general flow chart of random access provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of random access average delay with increasing threshold value according to an embodiment of the present invention;
fig. 7 is a schematic diagram of random access average time delay of a new mechanism and an original mechanism according to an increase of the number of users according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a ratio of 10000 times of simulation average delay meeting requirements according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
The application process of the configuration method based on the two-step random access resource multiplexing provided by the embodiment specifically relates to the following steps:
step 1, a user selects a two-step random access process at the user side;
step 2, a user side configures an MsgA message, a first part of the MsgA is used for the UE to send a selected preamble through the PRACH, the preamble is generated according to the message broadcasted by the base station, and a second part (i.e., payload) is used for the UE to send a randomly selected UE id through the PUSCH;
step 3, the user waits for the random access opportunity RO;
step 4, the user transmits the MsgA in the RO;
step 5, the base station receives the MsgA message sent by the user side;
step 6, the base station side detects the preamble part in the received MsgA message;
step 7, the base station side decodes the PUSCH part, and selects the users with the same preamble user number exceeding the threshold value part to trigger a retransmission mechanism, and the base station feeds back a Fallback RAR message to the users exceeding the threshold value part;
step 8, configuring MsgB at the base station side, wherein the MsgB consists of all (UEID, C-RNTI) pairs and feedback information, and transmitting the feedback information to the UE through PDSCH;
step 9, at the user side, the user receives an MsgB message, where the MsgB message includes (UEID, C-RNTI) information of the user, which indicates that the user has successfully completed the random access procedure.
In this embodiment, the application scenario is N ue Individual user usage N p The random access procedure is performed by each preamble at the same time, as shown in fig. 1.
In step 2 of the present embodiment, the ue id is represented by a demodulation reference signal (DMRS), and since 22 DMRS are also selected from the orthogonal set, multiple DMRS can be simultaneously transmitted on the same PUSCH without collision. Of the 22 available DMRSs, only 16 are selected, numbered from 0 to 15 for simplicity. According to the transmission of DMRS, in the proposed design, the ue id is (123A) 16 The four DMRSs numbered 1,2,3 and a will be transmitted to the gNB in the first four symbols of the first and second slots of the dedicated PUSCH, as shown in fig. 2.
In step 3 of the present embodiment, a random access opportunity RO with an index of 11 is selected, and as shown in table 1, initial access is set to start at 0 slot. The gNB needs to include a pre-allocated PUSCH frequency domain location and a mapping from the preamble to the corresponding frequency domain PUSCH location in SIB2, the preamble to PUSCH mapping being one-to-one, the number of RBs for the entire PUSCH being twice the number of user preambles, as shown in fig. 3.
Table 1 random access configuration for preamble format 0
Figure BDA0004050722810000071
In step 4 of the present embodiment, N ue Each UE transmits MsgA in one RO at the same time, consisting of a preamble and a payload, occupies two subframes in the time domain, and requires 2ms for the user to send it.
In step 7 of the present embodiment, the number n of i (i=1, 2,3, … …) users selecting the same preamble is detected i Satisfies the following conditions
Figure BDA0004050722810000081
The length of the MSGB is related to the number of (UEIDC-RNTI) combinations and the signalling flow diagram is shown in fig. 4. When n users use the same preamble, the number of combinations is n 4 The base station is now set to select the same preamble N at most every time th The individual users send random access responses, and the exceeding part sends Fallback RAR information to the UE, and the flow chart is shown in figure 5.
N th When the same preamble is selected by each user, the time required for transmitting the MsgB is:
Figure BDA0004050722810000082
in general, the time required to transmit MsgB is:
Figure BDA0004050722810000083
when the UE receives the fallback rar message, it needs to wait for the next random access opportunity RO to retransmit Msg a, where the Msg a transmission time interval Δt for two times is:
Figure BDA0004050722810000084
Figure BDA0004050722810000085
is N th The ceil () function represents the round-up time required for each user to select the same preamble once for each user.
The number of transmissions required to select i users of the same preamble is:
Figure BDA0004050722810000091
the fix () function represents an integer-taking portion, and the mod () function represents a remainder-taking portion. The time required for each user to receive per transmission is:
T 1 ＝T msgA +T msgB1
T 2 ＝T msgA +T msgB2 +Δt
...
T n ＝T msgA +T msgBn +(n-1)Δt
then the total time for all users selecting the same preamble is:
Figure BDA0004050722810000092
the total delay before all users is:
Figure BDA0004050722810000093
the average time delay is as follows:
Figure BDA0004050722810000094
simulating a threshold N from 1 to N with matlab given the number of users and the number of preambles ue As shown in FIG. 6, the time delay simulation diagram of (a) can be obtained when the threshold N is obtained by using the same number of preambles for different users th When=2, the random access average delay is the lowest.
When N is th When the number of the preambles is not changed and the number of users is from small to large, the average time delay of one iteration method and the average time delay of the traditional method using the method are compared, as shown in fig. 7, and it can be seen that the average time delay of the method is always lower than that of the traditional method. Compared with an iteration method, when the number of users is less than or equal to 4, the average time delay is basically similar, but as the number of users is increased, the average time delay of the method is reduced compared with that of the iteration method. As shown in fig. 8, the iteration method is simulated 10000 times with the method, the times that the average time delay is less than 10ms are counted, when the number of users exceeds 8, the time delay requirement ratio of the iteration method is reduced, and the method keeps a higher ratio all the time.
In summary, the method for multiplexing the random access resources based on the two steps of competition combines the resource multiplexing method of retransmission and one iteration, meets the time delay requirement of URLLC, and has lower average time delay of random access of users compared with the one iteration method and the traditional method.
Example 2
The embodiment introduces a configuration method based on two-step random access resource multiplexing, which is applicable to a plurality of user terminals, and the method comprises the following steps:
configuring an MsgA message, wherein a first part of the MsgA message is used for a User Equipment (UE) to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second part of the MsgA message is used for the UE to send a randomly selected UEID through a PUSCH;
waiting for a random access opportunity (RO), transmitting MsgA messages to a base station in one RO by a plurality of user terminals at the same time, so that after the base station receives the MsgA messages, detecting a preamble part in the received MsgA messages; decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station; the method comprises the steps of configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and sending the feedback messages to each user terminal through a PDSCH, wherein the C-RNTI is a dynamic identifier distributed to UE by a base station;
and receiving an MsgB message, wherein the MsgB message contains (UEID, C-RNTI) information of the user terminal, and successfully completing the random access process.
Specifically, the MsgA message includes a preamble and a payload.
Specifically, the ue id is represented by a demodulation reference signal DMRS, which is selected from the orthogonal set.
Specifically, when decoding the PUSCH part, detecting the number of user ends using each same preamble, setting the number of UEs having the same preamble as n, and the gNB will allocate a unique C-RNTI to C combinations of UE ids having the same preamble; when N is less than or equal to N th When c=n 4 When N > N th When c=n th 4 ，N th The maximum number of random access responses for the base station to select the same preamble user terminal is given to N according to the decoding sequence th The individual user terminals make random access responses exceeding the threshold N th The ue receives the fallbackhaul message and retransmits the message at the next random access opportunity.
Example 3
The embodiment introduces a configuration method based on two-step random access resource multiplexing, which is applicable to a base station, and the method comprises the following steps:
receiving an MsgA message transmitted by a plurality of user terminals in one RO at the same time, and detecting a preamble part in the received MsgA message; wherein a first part of the MsgA message is used for the UE to transmit a selected preamble through the PRACH, the preamble is generated according to the message broadcast by the base station, and a second part is used for the UE to transmit a randomly selected UE id through the PUSCH;
decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station;
and configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and the feedback messages are sent to each user end through a PDSCH (physical downlink shared channel) so that the user end receives the MsgB message and successfully completes the random access process.
Specifically, the MsgA message includes a preamble and a payload.
Specifically, the ue id is represented by a demodulation reference signal DMRS, which is selected from the orthogonal set.
Specifically, when decoding the PUSCH part, detecting the number of user ends using each same preamble, setting the number of UEs having the same preamble as n, and the gNB will allocate a unique C-RNTI to C combinations of UE ids having the same preamble; when N is less than or equal to N th When c=n 4 When N > N th When c=n th 4 ，N th The maximum number of random access responses for the base station to select the same preamble user terminal is given to N according to the decoding sequence th The individual user terminals make random access responses exceeding the threshold N th The ue receives the fallbackhaul message and retransmits the message at the next random access opportunity.
Example 4
The embodiment introduces a configuration device based on two-step random access resource multiplexing, which is applicable to a plurality of user terminals, and the device comprises:
a user configuration module, configured to configure an MsgA message, where a first portion of the MsgA message is used for a user equipment UE to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second portion is used for the UE to send a randomly selected UE id through a PUSCH;
a user sending module, configured to wait for a random access opportunity RO, where multiple user ends transmit MsgA messages to a base station at the same time in one RO, so that after the base station receives the MsgA messages, the base station detects a preamble portion in the received MsgA messages; decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station; the method comprises the steps of configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and sending the feedback messages to each user terminal through a PDSCH, wherein the C-RNTI is a dynamic identifier distributed to UE by a base station;
and the user receiving module is used for receiving the MsgB message, wherein the MsgB message contains the (UEID, C-RNTI) information of the user terminal, and the random access process is successfully completed.
Example 5
The embodiment introduces a configuration device based on two-step random access resource multiplexing, which is applicable to a base station, and the device comprises:
the base station receiving module is used for receiving the MsgA messages transmitted by a plurality of user terminals in one RO at the same time and detecting a preamble part in the received MsgA messages; wherein a first part of the MsgA message is used for the UE to transmit a selected preamble through the PRACH, the preamble is generated according to the message broadcast by the base station, and a second part is used for the UE to transmit a randomly selected UE id through the PUSCH;
the base station feedback module is used for decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station;
the base station configuration and sending module is used for configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and the MsgB message is sent to each user terminal through a PDSCH, so that the user terminal receives the MsgB message, and the random access process is successfully completed.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (10)

1. The configuration method based on the two-step random access resource multiplexing is characterized by being suitable for a plurality of user terminals, and comprises the following steps:
configuring an MsgA message, wherein a first part of the MsgA message is used for a User Equipment (UE) to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second part of the MsgA message is used for the UE to send a randomly selected UEID through a PUSCH;
waiting for a random access opportunity (RO), transmitting MsgA messages to a base station in one RO by a plurality of user terminals at the same time, so that after the base station receives the MsgA messages, detecting a preamble part in the received MsgA messages; decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station; the method comprises the steps of configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and sending the feedback messages to each user terminal through a PDSCH, wherein the C-RNTI is a dynamic identifier distributed to UE by a base station;
and receiving an MsgB message, wherein the MsgB message contains (UEID, C-RNTI) information of the user terminal, and successfully completing the random access process.
2. The two-step random access resource multiplexing based configuration method of claim 1, wherein the MsgA message comprises a preamble and a payload.
3. The two-step random access resource multiplexing based configuration method of claim 1, wherein the ue id is represented by a demodulation reference signal DMRS, which is selected from an orthogonal set.
4. The configuration method based on two-step random access resource multiplexing according to claim 1, wherein when decoding the PUSCH part, detecting the number of user terminals using each same preamble, and setting the number of UEs with the same preamble as n, the gNB will allocate a unique C-RNTI to C combinations of UE ids with the same preamble; when N is less than or equal to N th When c=n 4 When N > N th When c=n th 4 ，N th The maximum number of random access responses for the base station to select the same preamble user terminal is given to N according to the decoding sequence th The individual user terminals make random access responses exceeding the threshold N th The ue receives the fallbackhaul message and retransmits the message at the next random access opportunity.
5. A configuration method based on two-step random access resource multiplexing, which is characterized by being applicable to a base station, the method comprising:
receiving an MsgA message transmitted by a plurality of user terminals in one RO at the same time, and detecting a preamble part in the received MsgA message; wherein a first part of the MsgA message is used for the UE to transmit a selected preamble through the PRACH, the preamble is generated according to the message broadcast by the base station, and a second part is used for the UE to transmit a randomly selected UE id through the PUSCH;
decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station;
and configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and the feedback messages are sent to each user end through a PDSCH (physical downlink shared channel) so that the user end receives the MsgB message and successfully completes the random access process.
6. The two-step random access resource multiplexing based configuration method of claim 5, wherein the MsgA message comprises a preamble and a payload.
7. The two-step random access resource multiplexing based configuration method of claim 5, wherein the ue id is represented by a demodulation reference signal DMRS selected from an orthogonal set.
8. The two-step random access resource multiplexing based configuration method according to claim 5, wherein the pair ofWhen the PUSCH part decodes, detecting the number of the user ends using each same preamble, setting the number of the UEs with the same preamble as n, and the gNB allocates unique C-RNTI to C combinations of UEIDs with the same preamble; when N is less than or equal to N th When c=n 4 When N > N th When c=n th 4 ，N th The maximum number of random access responses for the base station to select the same preamble user terminal is given to N according to the decoding sequence th The individual user terminals make random access responses exceeding the threshold N th The ue receives the fallbackhaul message and retransmits the message at the next random access opportunity.
9. A configuration device based on two-step random access resource multiplexing, which is suitable for a plurality of user terminals, the device comprising:
a user configuration module, configured to configure an MsgA message, where a first portion of the MsgA message is used for a user equipment UE to send a selected preamble through a physical random access channel PRACH, the preamble is generated according to a message broadcast by a base station, and a second portion is used for the UE to send a randomly selected UE id through a PUSCH;
a user sending module, configured to wait for a random access opportunity RO, where multiple user ends transmit MsgA messages to a base station at the same time in one RO, so that after the base station receives the MsgA messages, the base station detects a preamble portion in the received MsgA messages; decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station; the method comprises the steps of configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and sending the feedback messages to each user terminal through a PDSCH, wherein the C-RNTI is a dynamic identifier distributed to UE by a base station;
and the user receiving module is used for receiving the MsgB message, wherein the MsgB message contains the (UEID, C-RNTI) information of the user terminal, and the random access process is successfully completed.
10. A configuration device based on two-step random access resource multiplexing, which is suitable for a base station, the device comprising:
the base station receiving module is used for receiving the MsgA messages transmitted by a plurality of user terminals in one RO at the same time and detecting a preamble part in the received MsgA messages; wherein a first part of the MsgA message is used for the UE to transmit a selected preamble through the PRACH, the preamble is generated according to the message broadcast by the base station, and a second part is used for the UE to transmit a randomly selected UE id through the PUSCH;
the base station feedback module is used for decoding the PUSCH part, selecting a user terminal with the same preamble user number exceeding a threshold value part to trigger a retransmission mechanism, and configuring a feedback message Fallback RAR for the user terminal exceeding the threshold value part by the base station;
the base station configuration and sending module is used for configuring an MsgB message, wherein the MsgB message consists of all (UEID, C-RNTI) pairs and feedback messages, and the MsgB message is sent to each user terminal through a PDSCH, so that the user terminal receives the MsgB message, and the random access process is successfully completed.
CN202310041126.2A 2023-01-12 2023-01-12 Configuration method and device based on two-step random access resource multiplexing Pending CN116209088A (en)

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