Contention Free Random Access 2-Step RACH PUSCH Data Transmission
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Solution Overview
Problem
Current radio communication systems lack a 2-step random access method suitable for contention free random access and do not support data transmission on PUSCH resources, limiting the efficiency of uplink data transmission in radio communication processes.
Innovation Solution
A contention free random access method is introduced, where a network side device configures preambles and PRACH resources for user equipment (UE) to perform contention free random access, enabling the UE to send random access requests and uplink data on corresponding PUSCH resources, with the network side device receiving and processing these requests and data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional 4-step RACH is used for contention free random access, then the random access process is completed, but the uplink data transmission efficiency is reduced due to additional steps
Solution Approach 1:
The patent combines the random access preamble transmission and uplink data transmission into a single 2-step process. The UE transmits both the preamble and uplink data together in MsgA, and the network responds with a single MsgB containing both random access response and uplink grant, eliminating the separate steps of conventional 4-step RACH and reducing access time.
Solution Approach 2:
The patent segments the MsgA transmission into two parts: the random access preamble and the uplink data payload. This segmentation allows the system to handle random access and data transmission in an integrated yet structured manner, enabling efficient resource allocation and processing at the network side.
2Device complexity
If 2-step RACH is applied to contention free random access, then the access process is simplified, but data transmission on PUSCH resource is not supported
Solution Approach 1:
The patent makes the 2-step RACH procedure universal by enabling it to support both contention-based and contention-free random access modes. The MsgA structure is designed to carry both preamble and uplink data, and the network configures appropriate PUSCH resources based on the access type, allowing the same 2-step framework to serve multiple purposes.
Solution Approach 2:
The patent introduces dynamic configuration of PUSCH resources for contention-free random access. The network dynamically allocates and configures dedicated PUSCH resources through RRC signaling, allowing the system to adapt the 2-step RACH procedure to different scenarios (contention-based or contention-free) and traffic requirements, enhancing versatility.
3Adaptability or versatility
If dedicated PUSCH resource is configured for contention free random access, then uplink data transmission is enabled, but the configuration complexity increases
Solution Approach 1:
The patent performs preliminary configuration of PUSCH resources through RRC signaling before the actual random access occurs. The network pre-allocates dedicated PUSCH resources and configures the corresponding parameters (time/frequency resources, modulation, coding) in advance, so that when contention-free random access is needed, the UE can directly use the pre-configured resources without complex runtime negotiation.
Solution Approach 2:
The patent uses RRC signaling as an intermediary to bridge the network's resource allocation and the UE's transmission. The RRC configuration messages carry the PUSCH resource parameters from the network to the UE, establishing a dedicated uplink path for contention-free random access without requiring complex real-time interaction during the access procedure itself.
Data Source
AI summary
Disclosed in the embodiments of the present application are a contention free random access method and device, for solving the problem that there are no solutions applicable to a contention free random access 2-step RACH and for performing data transmission by means of a PUSCH resource in a communication process. In the embodiments of the present application, a network side device sends, to a terminal, allocation information of a preamble code and/or a PRACH resource; and the terminal sends a random access request by means of the preamble code and/or the PRACH resource, and sends uplink data on a PUSCH resource corresponding to the preamble code and/or the PRACH resource. Said method provides a two-step random access method for contention free random access, and also provides a method for performing data transmission by means of a PUSCH resource when the contention free random access is performed.