CN116390263A - Random access method, user terminal and network terminal - Google Patents

Random access method, user terminal and network terminal Download PDF

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Publication number
CN116390263A
CN116390263A CN202310278842.2A CN202310278842A CN116390263A CN 116390263 A CN116390263 A CN 116390263A CN 202310278842 A CN202310278842 A CN 202310278842A CN 116390263 A CN116390263 A CN 116390263A
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China
Prior art keywords
random access
downlink control
control information
channel resource
message
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CN202310278842.2A
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Chinese (zh)
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李温温
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Nanjing Xinjixun Communication Technology Co ltd
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Nanjing Xinjixun Communication Technology Co ltd
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Priority to CN202310278842.2A priority Critical patent/CN116390263A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a random access method, a user side and a network side, wherein the user side sends a first message bearing a random access request; the user side monitors downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index; the user terminal receives the downlink control information when detecting that the indication mark carried in the downlink control information is matched with the random access channel resource allocation used by the sent first message; and the user receives a second message carrying the random access response according to the downlink control information. The user can accurately receive the random access response message by distinguishing the indication mark.

Description

Random access method, user terminal and network terminal
Technical Field
The present invention relates to the field of network communications technologies, and in particular, to a random access method, a user side, and a network side.
Background
After obtaining the random access channel resource configuration, the User Equipment (UE) may initiate an initial random access procedure. In the random access process, the user equipment initiates a random access request to a network end at random access channel time (random access channel occasion, RO), the network end calculates to obtain a random access wireless network temporary identifier (random access radio network temporary identity, RA-RNTI) corresponding to the user equipment according to a protocol, scrambles downlink control information (DCI, downlink control information) for scheduling random access response by using the calculated RA-RNTI, and sends the scrambled downlink control information out. The user equipment calculates the RA-RNTI according to the protocol, monitors downlink control information on a physical downlink control channel (Physical Downlink Control Channel, PDCCH) by using the calculated RA-RNTI, and if the RA-RNTI DCI is detected and the scheduled PDSCH, namely MSG2, is decoded correctly, analyzes the MSG2 to judge whether the PDSCH contains the random access response of the UE.
After the random access channel resource group (RACH Partition) is added to the 5g NR 17, the Physical Random Access Channel (PRACH) resources of different slice groups are different, that is, there are multiple groups of random access channel resource configurations, and the service types of the random access channel resource configurations of each group are different. The UE uses the random access channel resource configuration increase information of different groups to indicate to the network, for example, the UE informs the network that the UE is a Redcap UE, needs to perform MSG3 repetition, SDT indication, etc. Referring to fig. 1, in combination with the configuration of 38.331, an Additional random access channel configuration list, i.e. Additional RACH-ConfigList-R17, is added in the bandwidth part (BWP, carrier Bandwith Part), with a maximum of 16 independent sets of random access channel resource configurations RACH-Config. After the random access channel resource grouping is introduced, the RA-RNTI collision problem may be caused, that is, different user equipments may correspondingly obtain the same RA-RNTI, and if the Random Access Response Windows (RARW) are the same, it cannot be distinguished whether the random access Response messages belong to the user equipment.
Disclosure of Invention
Based on the above problems, the present invention provides a random access method, which aims to accurately receive a random access response message belonging to the user.
A random access method, comprising:
step A1, a user side sends a first message carrying a random access request;
step A2, the user side monitors downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
step A3, the user terminal receives the downlink control information when detecting that the indication mark carried in the downlink control information is matched with the random access channel resource allocation used by the sent first message;
and step A4, the user terminal receives a second message carrying the random access response according to the downlink control information.
Further, in step A2, the reserved bits of the downlink control information in the format 1-0 carry the indication identifier.
A random access method, comprising:
step A1, a network end issues downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
and step A2, the network end transmits a second message carrying the random access response, wherein the random access response in the second message corresponds to the indication identifier.
Further, in step A1, the reserved bit of the downlink control information format 1_0 carries an indication identifier.
Further, in step A1, the maximum number of reserved bits for carrying the indication identifier is:
N b ＝log 2 N r ；
wherein,,
N b the maximum bit number for carrying the indication mark in the reserved bit of the downlink control information format 1_0;
N r representing the total number of groups of random access channel resource configurations.
A ue, using a random access method as described above, is configured to perform:
sending a first message carrying a random access request;
monitoring downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
receiving downlink control information when the fact that the indication mark carried in the downlink control information is matched with the random access channel resource allocation used by the sent first message is monitored;
and receiving a second message carrying the random access response according to the downlink control information.
Further, the reserved bit of the downlink control information format 1_0 carries an indication identifier.
A network side, using a random access method as described above, is configured to perform:
downlink control information is issued, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
and issuing a second message carrying the random access response, wherein the random access response in the second message corresponds to the indication identifier.
Further, the reserved bit of the downlink control information format 1_0 carries an indication identifier.
Further, the maximum number of bits in the reserved bits of the downlink control information format 1_0, which are used for carrying the indication identifier, is:
N b ＝log 2 N r ；
wherein,,
N b representing a maximum number of bits for carrying an indication identifier;
N r representing the total number of groups of random access channel resource configurations.
The beneficial technical effects of the invention are as follows: the user terminal determines the downlink control information of the user terminal by distinguishing the indication mark so as to accurately receive the random access response message of the user terminal.
Drawings
Fig. 1 is a diagram illustrating the addition of random access channel resource packets in 5g NR 17;
fig. 2 is a flow chart of steps of a random access method implemented at a ue according to the present invention;
fig. 3 is an explanatory diagram of a collision that may occur with RA-RNTIs corresponding to different user equipments;
fig. 4 is a flow chart of steps of a random access method implemented at a network end according to the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
In the present invention, the network where the network side and the user side are located may be a 5G or NR network or some other wireless network, such as an LTE network.
Referring to fig. 2, the present invention provides a random access method, including:
step A1, a user side sends a first message carrying a random access request;
step A2, the user side monitors downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
step A3, the user terminal receives the downlink control information when detecting that the indication mark carried in the downlink control information is matched with the random access channel resource allocation used by the sent first message;
and step A4, the user terminal receives a second message carrying the random access response according to the downlink control information.
In the invention, the user terminal determines the downlink control information belonging to the user terminal by distinguishing the indication mark by carrying the indication mark indicating the random access channel resource grouping in the downlink control information so as to accurately receive the random access response message belonging to the user terminal.
Specifically, the indication identifier is used to indicate the RACH-ConfigIndex configured in the PACH configuration independent RACH-ConfigGeneric. Specifically, the indication identifier and the indication PACH configure the RACH-ConfigIndex configured in the independent RACH-ConfigGeneric to be consistent.
In step A3, when the indication identifier carried in the monitored downlink control information is consistent with the RACH-ConfigIndex used for sending the first message, the user side indicates that the indication identifier is matched with the random access channel resource configuration used by the sent first message. Further, in step A1, the first message includes a random access preamble, and a random access radio network temporary identifier (random access radio network temporary identity, RA-RNTI) is calculated and stored;
the method further comprises the following steps after the step A2 and before the step A3:
and B1, the user side monitors downlink control information (DCI, downlink control information) by using the RA-RNTI calculated by the user side, and when the RA-RNTI in the downlink control information is detected to be consistent with the RA-RNTI calculated by the user side, the step A3 is continuously executed.
In step B1, the ue listens to a physical downlink control channel (Physical Downlink Control Channel, PDCCH) in a Random Access Response Window (RARW) corresponding to the first message, so as to monitor downlink control information.
Specifically, the calculation formula of the RA-RNTI is as follows:
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id；
wherein,,
s_id is the starting symbol index (0 < = s_id < 14) of PRACH (physical random access channel );
t_id is the starting slot index of PRACH within the system frame (0 < = t_id < 80);
f_id is the location index of PRACH on the frequency domain (0 < = f_id < 8);
ul_carrier_id is the uplink carrier (0=normal carrier, 1=sul carrier) that sent the first message.
As shown in fig. 3, if the random access channel resource configurations RACH-config selected by two user equipments are different, one user equipment UE1 selects RACH-config1, one user equipment UE2 selects RACH-config2, i.e. belongs to different groups, the same time domain position (i.e. the same slot and the same starting symbol position) is used, and the same random access channel occasion (RACH timing) of the frequency domain resource position f_id is selected, the calculated RA-RNTI is the same, DCI is monitored only by the RA-RNTI, and whether the random access response belongs to itself cannot be distinguished within the same random access response window (RA-response window). The DCI carries the indication mark, and only when the indication mark and the self-used random access channel resource allocation are caused, the corresponding random access response message is considered to belong to the self. Where the abscissa t in fig. 3 represents time, and ra-Response Window represents a random access Response Window.
In step A3, if the ue detects that the indication identifier carried in the downlink control information is not matched with the random access channel resource configuration used by the sent first message, the ue discards the downlink control information and continues to monitor the downlink control information in the random access response window.
Specifically, in step A3, the ue analyzes and monitors the format 1_0 of the downlink control information, i.e. detects DCI format 1_0.
Further, in step A2, the reserved bit (reserved field) of the format 1_0 (DCI format 1_0) of the downlink control information carries an indication identifier.
Referring to fig. 4, the present invention further provides a random access method, including:
step A1, a network end issues downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
and step A2, the network end transmits a second message carrying the random access response, wherein the random access response in the second message corresponds to the indication identifier.
Further, in step A1, the reserved bit of the downlink control information format 1_0 carries an indication identifier.
Specifically, the network side scrambles the downlink control information according to the calculated RA-RNTI, and sets an indication identifier in the downlink control information. For example, if the random access channel resource configuration RACH-config is 7, i.e., the random access channel resource configuration index is 7, the reserved bit is set to 7 as the indication flag. If the random access channel resource configuration RACH-config is 9, that is, the random access channel resource configuration index is 9, the reserved bit is set to 9 as the indication identifier.
Further, in step A1, the maximum number of reserved bits for carrying the indication identifier is:
N b ＝log 2 N r ；
wherein,,
N b the maximum bit number for carrying the indication mark in the reserved bit of the downlink control information format 1_0;
N r representing the total number of groups of random access channel resource configurations. N (N) r I.e. the total number of configurations of RACH-ConfigIndex in the independent RACH-ConfigGeneric.
For example, the total number of groups of the random access channel resource configuration is 16 groups, and is represented by 4 bits. The invention also provides a user terminal, which uses the random access method to execute:
sending a first message carrying a random access request;
monitoring downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
receiving downlink control information when the fact that the indication mark carried in the downlink control information is matched with the random access channel resource allocation used by the sent first message is monitored;
and receiving a second message carrying the random access response according to the downlink control information.
In the present invention, a user terminal may be referred to as a terminal device (UE), a User Equipment (UE), a mobile station, a mobile terminal, etc. The user side can be widely applied to various scenes, such as equipment-to-equipment, vehicle-to-object communication, machine type communication, internet of things, virtual reality, augmented reality, automatic driving, telemedicine, mobile phones, tablet computers, smart home, wearable equipment, unmanned aerial vehicles and the like. The user terminal can be mobile or fixed.
Further, the reserved bit (reserved field) of the downlink control information format 1_0 carries an indication identifier.
The invention also provides a network end, which uses the random access method to execute:
downlink control information is issued, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
and issuing a second message carrying the random access response, wherein the random access response in the second message corresponds to the indication identifier.
In the present invention, the network may be a base station (base station), an evolved NodeB (eNodeB), a transmitting/receiving point (transmission reception point, TRP), a next generation NodeB (gNB) in a fifth generation (5th generation,5G) mobile communication system, a macro base station, a micro base station, an indoor station, a relay node, a sixth generation (6) th generation, 6G) of next generation base stations in a mobile communication system, base stations in future mobile communication systems, or access nodes in WiFi systems, etc., may also be modules or units that perform part of the functions of the base stations, such as Central Units (CUs).
Further, the reserved bit of the downlink control information format 1_0 carries an indication identifier.
Further, the maximum number of bits in the reserved bits of the downlink control information format 1_0, which are used for carrying the indication identifier, is:
N b ＝log 2 N r ；
wherein,,
N b representing a maximum number of bits for carrying an indication identifier;
N r representing the total number of groups of random access channel resource configurations.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.

Claims (10)

1. A random access method, comprising:
step A1, a user side sends a first message carrying a random access request;
a2, the user side monitors downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
step A3, the user terminal receives the downlink control information when the indication identifier carried in the downlink control information is detected to be matched with the random access channel resource allocation used by the sent first message;
and step A4, the user terminal receives a second message carrying a random access response according to the downlink control information.
2. The random access method according to claim 1, wherein in the step A2, the indication identifier is carried in a reserved bit of the downlink control information format 1_0.
3. A random access method, comprising:
step A1, a network end issues downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
and step A2, the network end transmits a second message carrying a random access response, wherein the random access response in the second message corresponds to the indication identifier.
4. A random access method according to claim 3, wherein in the step A1, the indication identifier is carried in a reserved bit of the downlink control information format 1_0.
5. The random access method according to claim 4, wherein in the step A1, the maximum number of reserved bits for carrying the indication identifier is:
N b ＝log 2 N r ；
wherein,,
N b the maximum bit number used for carrying the indication mark in the reserved bit of the downlink control information format 1_0;
N r representing the total number of groups of random access channel resource configurations.
6. A user terminal, characterized in that a random access method according to any of claims 1-2 is used for performing:
sending a first message carrying a random access request;
monitoring downlink control information, wherein the downlink control information carries an indication mark for indicating a random access channel resource allocation index;
receiving the downlink control information when the fact that the indication identifier carried in the downlink control information is matched with the random access channel resource allocation used by the sent first message is monitored;
and receiving a second message carrying the random access response according to the downlink control information.
7. The ue of claim 6, wherein the indication identifier is carried in a reserved bit of the downlink control information format 1_0.
8. A network side, characterized by using a random access method according to any of claims 3-5, for performing:
downlink control information is issued, wherein the downlink control information carries an indication identifier for indicating a random access channel resource allocation index;
and transmitting a second message carrying a random access response, wherein the random access response in the second message corresponds to the indication identifier.
9. The network side of claim 8, wherein the indication identifier is carried in a reserved bit of the downlink control information format 1_0.
10. The network side of claim 9, wherein the maximum number of bits in the reserved bits of the downlink control information format 1_0 for carrying the indication identifier is:
N b ＝log 2 N r ；
wherein,,
N b representing the maximum number of bits used for carrying the indication mark;
N r representing the total number of groups of random access channel resource configurations.
CN202310278842.2A 2023-03-21 2023-03-21 Random access method, user terminal and network terminal Pending CN116390263A (en)

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Application Number Priority Date Filing Date Title
CN202310278842.2A CN116390263A (en) 2023-03-21 2023-03-21 Random access method, user terminal and network terminal

Publications (1)

Publication Number Publication Date
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