Search Space Configuration for 2-Step and 4-Step RACH
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Solution Overview
Problem
In wireless communication systems, the existing methods for configuring search spaces and performing random access procedures in 2-step and 4-step RACH procedures face challenges in accurately recognizing random access responses, leading to potential access failures when terminals using different RACH procedures share the same resources.
Innovation Solution
The proposed solution involves generating and transmitting search space configuration information by access network equipment, which includes configurations for first and second search spaces. These search spaces are specifically designated to carry PDCCHs corresponding to messages B and 2 in the 2-step and 4-step RACH procedures, respectively, allowing terminals to accurately detect response messages by distinguishing between different search spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same search space is used for both 2-step and 4-step RACH procedures, then resource utilization is improved, but terminal accuracy in recognizing random access responses deteriorates
Solution Approach 1:
The patent divides the search space into two independent parts: a first search space for 2-step RACH procedure (MsgB) and a second search space for 4-step RACH procedure (Msg2). This segmentation allows terminals to accurately distinguish and detect responses based on their respective procedures while maintaining separate resource allocation, resolving the contradiction between resource utilization and recognition accuracy.
2Measurement precision
If separate search spaces are configured for 2-step and 4-step RACH procedures, then terminal accuracy in recognizing random access responses is improved, but device complexity increases
Solution Approach 1:
The patent configures both search spaces within the same control resource set (CORESET), allowing the system to maintain structured organization while reducing complexity. The search space configuration follows standardized procedures with clear differentiation through search space identifiers, enabling terminals to accurately recognize responses without requiring overly complex configuration mechanisms.
3Measurement precision
If search space configuration information is transmitted to terminals, then terminal ability to detect response messages is improved, but information transmission overhead increases
Solution Approach 1:
The search space configuration information is transmitted in advance to terminals before the random access procedure begins. This preliminary configuration allows terminals to store and use the search space details (first search space for MsgB, second search space for Msg2) during the actual random access process, eliminating the need for real-time information transmission and reducing overhead.
Data Source
AI summary
A method for configuring a search space includes: generating, by an access network equipment, search space configuration information, the search space configuration information including a configuration of a first search space and a configuration of a second search space, the configuration of the first search space being configured to indicate the first search space for carrying a first physical downlink control channel (PDCCH), the first PDCCH being a PDCCH corresponding to message B in a 2-step random access channel (RACH) procedure, the configuration of the second search space being configured to indicate the second search space for carrying a second PDCCH, the second PDCCH being a PDCCH corresponding to message 2 in a 4-step RACH procedure, the first search space and the second search space are different search spaces; and transmitting, by the access network equipment, the search space configuration information.