US-12628205-B2 - Random access method and apparatus, terminal, and network side device

US12628205B2US 12628205 B2US12628205 B2US 12628205B2US-12628205-B2

Abstract

This application discloses a random access method and apparatus, a terminal, and a network side device, belonging to the field of communication technologies. The method includes: sending a random access first target message, where a transmission parameter of the first target message is associated with position related information of the terminal, or the first target message carries position related information of the terminal, where the transmission parameter of the first target message includes at least one of: sequence information of the first target message; time domain resource information of the first target message; frequency domain resource information of the first target message; and sequence information of a demodulation reference signal included in the first target message.

Inventors

Dajie Jiang
Yuanyuan WANG
Xueming Pan
Pu Yuan

Assignees

VIVO MOBILE COMMUNICATION CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20230602
Priority Date: 20201204

Claims (20)

1 . A random access method, comprising: sending, by a terminal, a random access first target message, wherein a transmission parameter of the first target message is associated with position related information of the terminal, wherein the transmission parameter of the first target message comprises at least one of: sequence information of the first target message; time domain resource information of the first target message; frequency domain resource information of the first target message; or sequence information of a demodulation reference signal comprised in the first target message.
2 . The method according to claim 1 , wherein after the sending, by a terminal, a random access first target message, the method further comprises: receiving, by the terminal, a random access second target message sent by at least one first node, wherein sending related information of the second target message is associated with the transmission parameter of the first target message, or sending related information of the second target message is associated with the position related information of the terminal, wherein the sending related information of the second target message comprises at least one of: identification information of the at least one first node; or beam related information of the second target message, and wherein the first target message comprises: a message 1 in a four-step random access; and the second target message comprises: at least one of a message 2 or a message 4 in the four-step random access; or the first target message comprises: a message 3 in a four-step random access; and the second target message comprises: a message 4 in the four-step random access.
3 . The method according to claim 1 , wherein the position related information of the terminal comprises: position information of the terminal; and a measurement item related to a terminal position and measured by the terminal.
4 . The method according to claim 1 , further comprising: determining, based on the position related information of the terminal, the transmission parameter of the first target message associated with the position related information, wherein the sending a random access first target message comprises: sending the first target message based on the determined transmission parameter.
5 . The method according to claim 1 , wherein before the sending a random access first target message, the method further comprises: determining, based on at least one of measured Reference Signal Received Power (RSRP) of N2 first signals and N2 path losses, at least one of transmit power and a sending carrier of the first target message, wherein N2 is an integer greater than or equal to 1, and the N2 path losses are associated with the RSRP of the N2 first signals; and the sending a random access first target message comprises: sending the first target message based on at least one of the determined transmit power and the determined sending carrier of the first target message.
6 . The method according to claim 2 , wherein when the first target message is the message 1 and the second target message is the message 2, the message 2 comprises at least one of: identification information of a sending node of the message 4; sending beam related information of the message 4; time domain resource information of the message 4; or frequency domain resource information of the message 4.
7 . The method according to claim 2 , wherein the receiving a random access second target message sent by at least one first node comprises: receiving, based on target beam related information, the random access second target message sent by the at least one first node, wherein when the second target message is the message 2, the target beam related information is beam related information of at least one first signal with greatest signal strength in N3 first signals measured by the terminal, and N3 is an integer greater than or equal to 1; or when the second target message is the message 4, the target beam related information is beam related information of the message 2.
8 . The method according to claim 2 , wherein the first target message carries position related information of the terminal, wherein before the receiving a random access second target message sent by at least one first node, the method further comprises: receiving a first signal sent by the at least one first node, wherein the receiving a random access second target message sent by at least one first node comprises: receiving, based on beam related information of the first signal sent by the at least one first node, the random access second target message sent by the at least one first node, and wherein after the receiving a random access second target message sent by at least one first node, the method further comprises: determining, when the position related information of the terminal carried in the second target message is the same as the position related information of the terminal carried in the first target message, that the terminal successfully receives the second target message; or resending the first target message when the position related information of the terminal is not carried in the second target message, or that the position related information of the terminal carried in the second target message is different from the position related information of the terminal carried in the first target message.
9 . The method according to claim 2 , wherein when the first target message is the message 1 and the second target message is the message 2, the method further comprises: sending the message 3 to a target node in the at least one first node, wherein the message 3 implicitly or explicitly indicates that the terminal successfully receives sending related information corresponding to the message 2; and receiving the message 4 sent by the target node, wherein beam related information of the message 4 is the same as beam related information of the message 2, or wherein the beam related information of the message 4 is the same as beam related information carried in the message 3, wherein when the first target message is the message 3 and the second target message is the message 4, the method further comprises: sending, before the message 3 is sent, a reference signal associated with a terminal identifier; sending, after the message 3 is sent, a reference signal associated with a terminal identifier; or sending a reference signal associated with a terminal identifier on at least one symbol of a slot in which the message 3 is located.
10 . The method according to claim 1 , wherein before the sending a random access first target message, the method further comprises: receiving first signaling, wherein the first signaling comprises at least one of the following information: identification information of at least two cells; identification information of at least two nodes; position information of the at least two cells; position information of the at least two nodes; information about a first signal associated with each cell; or information about a first signal associated with each node.
11 . The method according to claim 1 , wherein before the sending a random access first target message, the method further comprises: receiving second signaling, wherein the second signaling is used for indicating resource information of a shared random access channel corresponding to at least two cells or at least two nodes.
12 . A random access method, comprising: receiving, by a network side device, a random access first target message; and obtaining, by the network side device, a transmission parameter of the random access first target message, wherein the transmission parameter of the first target message is associated with position related information of the terminal, wherein the transmission parameter of the first target message comprises at least one of: sequence information of the first target message; time domain resource information of the first target message; frequency domain resource information of the first target message; or sequence information of a demodulation reference signal comprised in the first target message.
13 . The method according to claim 12 , further comprising: determining, by the network side device based on the transmission parameter of the first target message or the position related information of the terminal, sending related information of a random access second target message, wherein the sending related information of the second target message comprises at least one of: identification information of at least one first node for sending the second target message, or beam related information of the second target message; and sending, by the network side device based on the sending related information of the second target message, the second target message through at least one first node.
14 . The method according to claim 13 , wherein the first target message comprises: a message 1 in a four-step random access, and the second target message comprises: at least one of a message 2 or a message 4 in the four-step random access; or the first target message comprises: a message 3 in a four-step random access, and the second target message comprises: a message 4 in the four-step random access.
15 . The method according to claim 13 , wherein the determining, based on the transmission parameter of the first target message, sending related information of a random access second target message comprises: determining, based on the transmission parameter of the first target message, sending related information associated with the transmission parameter of the first target message; and determining the sending related information associated with the transmission parameter of the first target message as the sending related information of the second target message.
16 . The method according to claim 12 , wherein the position related information of the terminal comprises: position information of the terminal; and a measurement item related to a terminal position and measured by the terminal, and wherein the determining, based on the position related information of the terminal, sending related information of a random access second target message comprises: determining, based on the position related information of the terminal, sending related information associated with the terminal position; and determining the sending related information associated with the terminal position as the sending related information of the second target message.
17 . The method according to claim 14 , wherein when the first target message is the message 1 and the second target message is the message 2, the message 2 comprises at least one of: identification information of a sending node of the message 4; sending beam related information of the message 4; time domain resource information of the message 4; or frequency domain resource information of the message 4.
18 . The method according to claim 13 , wherein before the sending, based on the sending related information of the second target message, the second target message through at least one first node, the method further comprises: sending a first signal through at least one first node, wherein beam related information of the first signal is the same as the beam related information of the second target message.
19 . The method according to claim 14 , wherein when the first target message is the message 3 and the second target message is the message 4, and wherein before the sending, based on the sending related information of the second target message, the second target message through at least one first node, the method further comprises: receiving, by the network side device through at least two nodes, a reference signal sent by the terminal and associated with a terminal identifier, and determining a terminal position; and sending the second target message based on sending related information associated with the terminal position.
20 . The method according to claim 12 , wherein before the receiving, by a network side device, a random access first target message, the method further comprises: sending first signaling to the terminal, wherein the first signaling comprises at least one of the following information: identification information of at least two cells; identification information of at least two nodes; position information of the at least two cells; position information of the at least two nodes; information about a first signal associated with each cell; or information about a first signal associated with each node, and wherein before the receiving, by a network side device, a random access first target message, the method further comprises: sending second signaling to the terminal, wherein the second signaling is used for indicating resource information of a shared random access channel corresponding to at least two cells or at least two nodes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/134968, filed on Dec. 2, 2021, which claims priority to Chinese Patent Application No. 202011415213.2, filed on Dec. 4, 2020, The entire contents of each of the above-identified applications are expressly incorporated herein by reference. TECHNICAL FIELD This application belongs to the field of communication technologies, and in particular, to a random access method and apparatus, a terminal, and a network side device. BACKGROUND In a conventional cell-based system, each cell has a specific coverage area. When a terminal communicates with the cell, a downlink or uplink signal is associated with information (such as a cell ID) about or a configuration parameter of the cell. When the terminal moves between different cells, an inter-cell handover or a cell reselection needs to be performed. A terminal at an edge of a cell is usually interfered by a neighboring cell (inter-cell interference). A concept of cell free abandons an idea of cell. In this case, a system is composed of many Access Points (AP) or Transmission Reception Points (TRP), and the terminal communicates with one or more neighboring APs or TRPs at the same time. When the terminal moves between the AP or the TRP, a serving AP or TRP of the terminal changes. In this case, the inter-cell handover or the cell reselection does not happen. Typically, a terminal is not subject to strong interference from a neighboring AP or TRP (because N APs or TRPs adjacent to the terminal usually serve as serving APs or TRPs of the terminal, and N is greater than or equal to 1). In the conventional cell (cell)-based system, in a random access process, the terminal needs to determine a RACH occasion based on a measured synchronization signal block index whose reference signal received power of a serving cell is greater than a target value, and send a MSG 1. A network side device determines a corresponding synchronization signal block index based on related information about the received MSG 1, to send a MSG 2 based on the determined synchronization signal block index. Because the concept of cell free abandons the idea of cell, the existing random access process is no longer suitable for a cell free system. SUMMARY Embodiments of this application provide a random access method and apparatus, a terminal, and a network side device. According to a first aspect, an embodiment of this application provides a random access method. The method includes: A terminal sends a random access first target message. A transmission parameter of the first target message is associated with position related information of the terminal, or the first target message carries position related information of the terminal. The transmission parameter of the first target message includes at least one of: sequence information of the first target message;time domain resource information of the first target message;frequency domain resource information of the first target message; andsequence information of a demodulation reference signal included in the first target message. According to a second aspect, an embodiment of this application provides a random access apparatus. The apparatus is applied to a terminal and includes: a first sending module, configured to send a random access first target message. A transmission parameter of the first target message is associated with position related information of the terminal, or the first target message carries position related information of the terminal. The transmission parameter of the first target message includes at least one of: sequence information of the first target message;time domain resource information of the first target message;frequency domain resource information of the first target message; andsequence information of a demodulation reference signal included in the first target message. According to a third aspect, an embodiment of this application provides a random access method. The method includes: A network side device receives a random access first target message. The network side device obtains a transmission parameter of the random access first target message or position related information of a terminal carried in the random access first target message. The transmission parameter of the first target message is associated with the position related information of the terminal. The transmission parameter of the first target message includes at least one of: sequence information of the first target message;time domain resource information of the first target message;frequency domain resource information of the first target message; and sequence information of a demodulation reference signal included in the first target message. According to a fourth aspect, an embodiment of this application provides a random access apparatus. The apparatus is applied to a network side device and includes: a first receiving module, con