Wireless Node 2-Step RACH Contention Resolution via Dynamic MsgB Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing the 2-step and 4-step Random Access Channel (RACH) procedures, particularly in resolving conflicts and supporting flexible switching between them, which affects signaling overhead and contention resolution.
Innovation Solution
A method is introduced where a first sequence and radio signal are transmitted, carrying a target identifier, and a second radio signal is received, with a first information block containing fields that determine whether additional information blocks are included, allowing for re-analysis to avoid extra signaling overhead and support flexible switching between 2-step and 4-step RACH procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If 2-step RACH is adopted to shorten time delay, then random access time delay is reduced, but conflict resolution in MsgB becomes more difficult
Solution Approach 1:
The MsgB message is segmented into multiple information blocks (first information block, second information block, third information block) with each block containing specific fields for different purposes. The first information block contains basic response information, the second information block contains contention resolution identifiers, and the third information block provides additional control information. This segmentation allows the system to handle conflict resolution efficiently within the compressed 2-step RACH framework.
Solution Approach 2:
The patent introduces a new dimension to MsgB by adding multiple information blocks with different fields (first field, second field, third field) that can be selectively activated. The first field indicates whether a second information block is present, and the second field indicates whether a third information block is present. This dimensional expansion allows the system to resolve conflicts without increasing the overall message structure complexity excessively.
2Quantity of substance
If MsgB structure is simplified to reduce signaling overhead, then signaling overhead is reduced, but flexibility in switching between 2-step and 4-step RACH is limited
Solution Approach 1:
The MsgB structure is made dynamic through the use of indicator fields that can be configured differently for 2-step and 4-step RACH procedures. The first field and second field act as dynamic indicators that can be set based on the specific RACH type being used. This allows the same MsgB structure to adapt to different procedural requirements without requiring separate message formats, thereby maintaining flexibility while reducing signaling overhead.
Solution Approach 2:
The MsgB message structure is designed with multi-functionality to serve both 2-step and 4-step RACH procedures. The same basic structure with its information blocks and fields can be used for both procedures, with the specific fields being activated or deactivated based on the procedure type. This universal design eliminates the need for separate message structures, reducing signaling overhead while maintaining switching flexibility.
3Reliability
If additional information blocks are added to MsgB to support contention resolution, then contention resolution capability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by adding information blocks only where specifically needed for contention resolution. The second information block is selectively added only when contention resolution is required, and it contains only the necessary fields (first-type identifier, second-type identifier). This localized approach ensures that contention resolution capability is enhanced without unnecessarily increasing signaling overhead for all MsgB transmissions.
Solution Approach 2:
The MsgB structure uses partial action by including only the necessary information blocks for the specific operational context. The indicator fields allow the system to include only the second and third information blocks when needed for contention resolution, rather than always including all possible blocks. This partial inclusion approach reduces average signaling overhead while maintaining full contention resolution capability when required.
Data Source
AI summary
The present disclosure provides a method and device in a node for wireless communications. A first node transmits a first sequence and a first radio signal, the first sequence is associated with the first radio signal; and receives a second radio signal; the first radio signal is used to carry a target identifier; the second radio signal comprises a first information block, the first information block comprises a first field and a second field, the second field is used to determine a first value, and the first value is a non-negative integer; the first field and a value interval to which the first value belongs are used to determine whether the second radio signal comprises a second information block. Through the re-analyzing of the existing signalings, the present disclosure avoids extra signaling overhead, realizes contention resolution of 2-step RACH, and supports flexible switching between 2-step RACH and 4-step RACH.