CN-119136328-B - Method and system for transmitting msgA message with dynamic length in random access process

CN119136328BCN 119136328 BCN119136328 BCN 119136328BCN-119136328-B

Abstract

The invention provides a transmission method and a transmission system of msgA messages with dynamic length in a random access process, wherein the method comprises the steps of receiving random access configuration information broadcast by a base station, determining a preamble code, PRU resources and msgA control information transmission parameters in a two-step/scheduling-free random access process, dynamically selecting msgA payload transmission parameters, namely msgA control information, transmitting the preamble code to the base station on a random access channel, modulating and encoding msgA control information based on the msgA control information transmission parameters, and carrying the msgA control information on a preamble symbol of the PRU resources to the base station, modulating and encoding msgA payload based on msgA payload transmission parameters, and carrying the msgA payload on other symbols of the PRU resources to the base station, so that msgA payloads with different lengths can be supported to be flexibly transmitted on corresponding PRU resources, and resource waste can be avoided, and resource utilization rate can be improved.

Inventors

HOU ZULEI
SHEN QINGGUO
QIU RUIQI
LIN YANG

Assignees

紫金山实验室

Dates

Publication Date: 20260512
Application Date: 20240806

Claims (13)

1. A method for transmitting a msgA message with a dynamic length in a random access procedure, which is applied to a user equipment, wherein the msgA message includes a preamble, msgA control information and msgA payload, the method comprising: receiving random access configuration information broadcast by a base station; determining the preamble, PRU resource and transmission parameter of msgA control information of a two-step random access process or a scheduling-free random access process based on the random access configuration information; dynamically selecting the transmission parameters of the msgA effective load as the msgA control information, wherein the msgA control information is used for modulating and coding the msgA effective load by a base station; transmitting the preamble to the base station on a random access channel; Modulation coding is carried out on the msgA control information based on the transmission parameters of the msgA control information, and the msgA control information after modulation coding is carried on a preamble symbol of the PRU resource and is sent to the base station; and carrying out modulation coding on the msgA payload based on the transmission parameters of the msgA payload, and carrying out the modulation coding on the msgA payload carried by the modulation coding on other symbols of the PRU resource to send the symbols to the base station.
2. The method of claim 1, wherein the transmission parameters of the msgA payload include a modulation and coding scheme used for transmitting the msgA payload, a number of time domain symbols, a transmission power control parameter, a radio channel state, a demodulation reference signal, and a period, and wherein the modulation and coding scheme includes a modulation scheme and a coding scheme.
3. The method for transmitting a msgA message of dynamic length in a random access procedure according to claim 2, wherein dynamically selecting the transmission parameters of the msgA payload includes: dynamically selecting transmission parameters of the msgA payload based on the length of the msgA payload, wherein the number of time domain symbols and the number of bits carried by one modulation symbol in the modulation scheme are respectively positively correlated with the length of the msgA payload, or Dynamically selecting transmission parameters of the msgA payload based on the strength of a downlink synchronization signal block, wherein the number of bits carried by one modulation symbol in the modulation scheme is positively correlated with the strength of the downlink synchronization signal block, or And dynamically selecting the transmission parameters of the msgA effective load based on the strength of the downlink reference signal, wherein the bit number carried by one modulation symbol in the modulation mode is positively correlated with the strength of the downlink reference signal.
4. The method for transmitting msgA messages with dynamic length in a random access procedure according to claim 1, wherein the random access configuration information includes a first mapping relationship between each of the candidate preambles and each of the candidate PRU resources, and a second mapping relationship between each of the candidate preambles and transmission parameters of each of msgA control information; the determining, based on the random access configuration information, transmission parameters of the preamble, PRU resources, and msgA control information of a two-step random access procedure or a scheduling-free random access procedure includes: Selecting the preamble from the various to-be-selected preambles; Selecting the PRU resources corresponding to the preamble from the PRU resources to be selected based on the first mapping relation; And selecting the transmission parameters of the msgA control information corresponding to the preamble from the transmission parameters of each msgA control information based on the second mapping relation.
5. The method for transmitting a msgA message with a dynamic length in a random access procedure according to claim 4, wherein selecting the preamble from the candidate preambles includes: the preamble is selected from the respective candidate preambles based on any one of the length of the msgA payload, the strength of the downlink synchronization signal block, and the strength of the downlink reference signal.
6. The method for transmitting a msgA message of dynamic length in a random access procedure according to claim 1, wherein said transmission parameters of msgA control information include modulation and coding scheme, number of preamble symbols, demodulation reference signal and period for transmitting said msgA control information.
7. A method for transmitting a msgA message with a dynamic length in a random access procedure, which is applied to a base station, wherein the msgA message includes a preamble, msgA control information and msgA payload, the method comprising: broadcasting random access configuration information; receiving the preamble on a random access channel; Determining PRU resources corresponding to the preamble and transmission parameters of msgA control information based on the random access configuration information; Receiving and processing the msgA control information after modulation coding on a preamble symbol of the PRU resource by adopting the transmission parameter of msgA control information to obtain the msgA control information as the transmission parameter of the msgA payload, wherein the msgA control information is the transmission parameter of the msgA payload dynamically selected by user equipment and is sent to a base station; And receiving and processing the msgA payload after modulation coding on other symbols of the PRU resource by adopting the transmission parameters of the msgA payload to obtain the msgA payload.
8. The method for transmitting msgA messages with dynamic length in a random access procedure according to claim 7, wherein the random access configuration information includes a first mapping relationship between each of the candidate preambles and each of the candidate PRU resources, and a second mapping relationship between each of the candidate preambles and transmission parameters of each of msgA control information; the determining, based on the random access configuration information, the PRU resource corresponding to the preamble and the transmission parameter of msgA control information includes: Selecting the PRU resources corresponding to the preamble from the PRU resources to be selected based on the first mapping relation; And selecting the transmission parameters of the msgA control information corresponding to the preamble from the transmission parameters of each msgA control information based on the second mapping relation.
9. A transmission system for a msgA message of dynamic length in a random access procedure, applied to a user equipment, the msgA message including a preamble, msgA control information, and msgA payload, the system comprising: the first receiving module is used for receiving random access configuration information broadcast by the base station; a first determining module, configured to determine, based on the random access configuration information, a transmission parameter of the preamble, PRU resource, and the msgA control information of a two-step random access procedure or a scheduling-free random access procedure; The dynamic selection module is used for dynamically selecting the transmission parameters of the msgA effective load as the msgA control information, wherein the msgA control information is used for modulating and coding the msgA effective load by a base station; A first transmitting module, configured to transmit the preamble to the base station on a random access channel; A second sending module, configured to perform modulation coding on the msgA control information based on the transmission parameter of the msgA control information, and send the modulation coded msgA control information to the base station by carrying the modulation coded msgA control information on a preamble symbol of the PRU resource; And a third sending module, configured to perform modulation coding on the msgA payload based on the transmission parameter of the msgA payload, and send the msgA payload after modulation coding to the base station by carrying the msgA payload on other symbols of the PRU resource.
10. A transmission system for a msgA message of dynamic length in a random access procedure, applied to a base station, wherein the msgA message includes a preamble, msgA control information, and msgA payload, comprising: a broadcasting module for broadcasting random access configuration information; a second receiving module for receiving the preamble on a random access channel; a second determining module, configured to determine, based on the random access configuration information, a PRU resource corresponding to the preamble and a transmission parameter of the msgA control information; a third receiving module, configured to receive, on a preamble symbol of the PRU resource, the msgA control information after modulation and coding by using a transmission parameter of the msgA control information, where the msgA control information is a transmission parameter of the msgA payload dynamically selected by a user equipment and sent to a base station; a first processing module, configured to process the msgA control information after modulation encoding to obtain the msgA control information, as a transmission parameter of the msgA payload; A fourth receiving module, configured to receive, on other symbols of the PRU resource, the msgA payload after modulation encoding using a transmission parameter of the msgA payload; and the second processing module is used for processing the msgA effective load after the modulation and coding to obtain the msgA effective load.
11. A user equipment comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for transmitting msgA messages of dynamic length in a random access procedure according to any one of claims 1 to 6 when the program is executed.
12. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for transmitting msgA messages of dynamic length in a random access procedure as claimed in claim 7 or 8 when the program is executed by the processor.
13. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method for transmission of msgA messages of dynamic length in a random access procedure according to any one of claims 1 to 6, or the steps of the method for transmission of msgA messages of dynamic length in a random access procedure according to claim 7 or 8.

Description

Method and system for transmitting msgA message with dynamic length in random access process Technical Field The present invention relates to the field of wireless communications technologies, and in particular, to a method and a system for transmitting msgA messages with dynamic length in a random access process. Background In a wireless network such as a fifth generation mobile communication technology (5th Generation Mobile Communication Technology,5G), a random access procedure is critical to establishing initial communication between a User Equipment (UE) and a base station. In a two-step random access procedure or a scheduling-free random access procedure, transmission parameters of msgA payloads are determined by a base station. Since the base station does not know the length of msgA payloads to be sent by the user equipment, the base station determines these parameters according to msgA payload maximum allowable length and broadcasts them to the user equipments in advance. For msgA payloads of different lengths, the transmission parameters of the payloads used by the user equipment are each determined based on the msgA payload maximum allowable length. Also, in order to be able to decode correctly at the base station, the user equipment cannot dynamically adjust msgA the transmission parameters of the payload to adapt it to msgA payloads of different lengths. Thus, for msgA payloads having a length less than the maximum allowable length, resource waste may result, resulting in low resource utilization. Disclosure of Invention The invention provides a method and a system for transmitting msgA messages with dynamic length in a random access process, which are used for supporting msgA payloads with different lengths to flexibly transmit on corresponding PRU resources, so that resource waste can be avoided, and the resource utilization rate is improved. In a first aspect, the present invention provides a method for transmitting msgA messages with dynamic length in a random access procedure, applied to a user equipment, where the msgA message includes a preamble, msgA control information, and msgA payload, the method includes: receiving random access configuration information broadcast by a base station; determining the preamble, PRU resource and transmission parameter of msgA control information of a two-step random access process or a scheduling-free random access process based on the random access configuration information; Dynamically selecting transmission parameters of the msgA payloads as the msgA control information; transmitting the preamble to the base station on a random access channel; Modulation coding is carried out on the msgA control information based on the transmission parameters of the msgA control information, and the msgA control information after modulation coding is carried on a preamble symbol of the PRU resource and is sent to the base station; and carrying out modulation coding on the msgA payload based on the transmission parameters of the msgA payload, and carrying out the modulation coding on the msgA payload carried by the modulation coding on other symbols of the PRU resource to send the symbols to the base station. According to the method for transmitting the msgA message with the dynamic length in the random access process, the transmission parameters of the msgA payload comprise a modulation and coding scheme for transmitting the msgA payload, the number of time domain symbols, the transmission power control parameter, the wireless channel state, a demodulation reference signal and a period, wherein the modulation and coding scheme comprises a modulation mode and a coding mode. According to the method for transmitting msgA messages with dynamic length in the random access process, the method for dynamically selecting the transmission parameters of the msgA payload comprises the following steps: The method comprises the steps of dynamically selecting transmission parameters of a msgA payload based on the length of the msgA payload, wherein the number of time domain symbols and the number of bits carried by one modulation symbol in a modulation mode are respectively positively correlated with the length of the msgA payload, or dynamically selecting the transmission parameters of the msgA payload based on the strength of a downlink synchronous signal block, wherein the number of bits carried by one modulation symbol in the modulation mode is positively correlated with the strength of the downlink synchronous signal block, or dynamically selecting the transmission parameters of the msgA payload based on the strength of a downlink reference signal, and wherein the number of bits carried by one modulation symbol in the modulation mode is positively correlated with the strength of the downlink reference signal. According to the method for transmitting the msgA message with the dynamic length in the random access process, the random access configuration information comprises a f