CN-122002624-A - Hybrid QoS large-scale unlicensed random access method based on multidimensional resources

Abstract

The invention discloses a multi-dimensional resource-based hybrid QoS large-scale unlicensed random access method for a large-scale MIMO system, which is suitable for the field of communication. A mathematical model based on large-scale MIMO unlicensed random access is built, the mathematical model comprises mMTC and URLLC access users, a URLLC user single-time slot access scheme is built by comprehensively utilizing pilot frequency domain, power domain and frequency domain diversity through multi-pilot frequency mechanism and limited block length decoding in a single time slot based on mixed received signals, a mMTC user multi-time slot access scheme is built by performing interference cancellation on URLLC access user signals and then utilizing multi-time slot copy retransmission mechanism and outage probability in a multi-time slot, and the high reliability and low time delay of URLLC users are guaranteed by fully utilizing the degree of freedom of multi-dimensional resources, meanwhile, the requirement of mMTC high concurrent connection is met, the mixed access of URLLC and mMTC users is realized, the massive terminal random access scene is met, and the method has good application prospect.

Inventors

• ZHU PENGCHENG
• Si Fuping
• LI JIAMIN
• WANG DONGMING
• YOU XIAOHU

Assignees

• 东南大学

Dates

Publication Date

20260508

Application Date

20260213

Claims (9)

1. 1. A hybrid quality of service QoS large-scale unlicensed random access method based on multidimensional resources, applied to a large-scale MIMO system, the method comprising: The method comprises the following steps that S1, a base station configures a single-time-slot multi-pilot access mechanism for URLLC users and configures a multi-time-slot duplicate retransmission access mechanism for mMTC users, wherein the single-time-slot multi-pilot access mechanism designates URLLC users to use a preamble sequence formed by linearly combining beta orthogonal pilots in a single time slot, and beta is a positive integer larger than 1; S2, the base station receives mixed uplink signals from URLLC users and mMTC users; S3, the base station carries out channel estimation and data decoding on URLLC users in the mixed uplink signal in a single time slot based on the multi-pilot access mechanism; s4, the base station performs interference cancellation on the mixed uplink signal by utilizing URLLC user data obtained by decoding in the step S3 so as to eliminate URLLC user signal components; and S5, the base station performs joint processing on signals from a plurality of time slots after interference cancellation in the step S4 based on the multi-time slot duplicate retransmission access mechanism so as to recover mMTC user data.
2. 2. The method according to claim 1, wherein in said step S1, the base station configures differentiated access resources for URLLC users and mMTC users, comprising: configuring a transmission power higher than mMTC users for URLLC users; The total bandwidth of the system is divided into a plurality of orthogonal sub-channels and is limited in the same time slot of the same sub-channel, and at most one URLLC user is allowed to access.
3. 3. The method of claim 1, wherein the multiple pilot access mechanism is defined by Preamble sequence formed by linear combination of orthogonal pilot frequencies The construction method is that from the predefined inclusion Sets of orthogonal pilots In, beta pilots are selected for each URLLC users and formulated A combination is carried out, wherein, A set of users is represented URLLC, 。
4. 4. The method of claim 1, wherein the multislot copy retransmission access mechanism further specifies that mMTC users use the same preamble sequence in different retransmission slots when repeatedly transmitting signal copies over the plurality of slots.
5. 5. The method of claim 1 wherein the number of time slots in which the mMTC user transmits the signal replica is a pre-configured fixed value or is dynamically determined based on channel conditions.
6. 6. The method of claim 1, wherein the joint processing in step S5 is joint decoding based on maximum ratio combining or maximum likelihood detection of received signals of the same mMTC users in different time slots.
7. 7. A hybrid quality of service QoS large-scale unlicensed random access device based on multidimensional resources, deployed at a base station, the device comprising: the mechanism and resource allocation module is used for configuring a multi-pilot access mechanism for URLLC users and configuring a multi-time slot duplicate retransmission access mechanism for mMTC users; A signal receiving module, configured to receive a mixed uplink signal from URLLC users and mMTC users; URLLC, a processing module, configured to perform channel estimation and data decoding on URLLC users in the mixed uplink signal based on the multi-pilot access mechanism; The interference cancellation module is used for performing interference cancellation on the mixed uplink signal by utilizing the data obtained by decoding by the URLLC processing module; And mMTC a joint processing module, configured to perform joint processing on signals from multiple timeslots output by the interference cancellation module based on the multi-timeslot duplicate retransmission access mechanism, so as to recover mMTC user data.
8. 8. A communication device is characterized by comprising a processor and a memory; The memory is used for storing a computer program; the processor for executing a computer program stored in the memory for implementing the method according to any one of claims 1 to 6.
9. 9. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method according to any of claims 1 to 6.

Description

Hybrid QoS large-scale unlicensed random access method based on multidimensional resources Technical Field The invention relates to the technical field of wireless communication, in particular to a hybrid QoS large-scale unlicensed random access method based on multidimensional resources. Background With the rapid development of the 6G vertical industry and the diversification of user demands, future communication systems need to support the extreme connection of massive terminals, and the wireless access network will be comprehensively changed from the traditional "man-to-man communication" to the universal intelligent connection mode of "large-scale machine type communication". Traditional multiple access will also evolve towards large-scale access, which is a core concern for future development. Unlike traditional communications, large-scale access involves multidimensional resource coordination, which not only needs to meet the reliability and delay requirements of access users, but also gives attention to high concurrent throughput of the system. Therefore, how to fully mine multi-dimensional resources such as time, frequency, space, code and the like by using the existing enabling technology to meet the differentiated requirements of large-scale access users becomes an important point of research. Massive MIMO has good spectral efficiency and spatial multiplexing gain, a key technology enabling highly reliable communication and massive access. The unlicensed random access can be directly transmitted to the base station by an access user to establish connection without the authorization of the base station, thereby simplifying the access process of the user, reducing the access time delay of the user and being a potential access technology. In addition, the multidimensional resources such as the time domain, the frequency domain, the power domain, the pilot frequency domain and the like can provide more degrees of freedom for large-scale access to support the extreme connection of massive terminals, so that the method and the device consider the combination of large-scale MIMO, unlicensed random access and the like from the multidimensional resources to support the large-scale access of the massive terminals. Because the massive terminals of mMTC and URLLC are integrated with each other, the massive terminals need to meet the reliability and time delay requirements of access users, and meanwhile, the high concurrent access throughput of the system is considered, and the unlicensed random access based on multidimensional resources is a feasible solution. The differentiated access requirements present a serious challenge to the design of the access scheme. The current non-orthogonal multiple access only improves the access spectrum efficiency from a single dimension, and is difficult to meet the differentiated requirement of mass terminal large-scale access, so that the method is not suitable for a large-scale access scene fused with mMTC and URLLC. Therefore, a hybrid QoS large-scale unlicensed random access scheme based on multidimensional resources needs to be proposed. Disclosure of Invention Technical problem In order to solve the problems, the invention provides a multi-dimensional resource-based hybrid QoS large-scale unlicensed random access method which can be suitable for massive terminal access fused with mMTC and URLLC, and can meet the requirements of URLLC users on high reliability and low time delay and simultaneously meet the requirements of mMTC users on reliability and high concurrent connection. Technical proposal In order to achieve the above purpose, the present invention provides the following technical solutions: A hybrid QoS large-scale unlicensed random access method based on multidimensional resources comprises the following steps: S1, establishing a mathematical model of unlicensed random access based on massive MIMO, configuring a multi-pilot access mechanism for URLLC users in a single time slot, and configuring a multi-time slot duplicate retransmission access mechanism for mMTC users; S2, in a single time slot, based on the mixed received signal, the user uses the method of the multi-pilot access mechanism (URLLC 'Zhang' a) Preamble sequence of orthogonal pilot frequency combination) and finite block length decoding, comprehensively utilizing pilot frequency domain, power domain and frequency domain diversity, and establishing URLLC user single time slot access scheme; S3, in the multislot, firstly, based on URLLC user signals decoded in the step S2, interference cancellation is carried out on URLLC access user signals, and then a mMTC user multislot access scheme is constructed by utilizing a multislot duplicate retransmission mechanism and interruption probability and integrating frequency domain, power domain and time domain diversity. Further, the described step S1 specifically includes the following sub-steps: s11, establishing a system model, namely configuring a rout