Offset-Based MsgB RNTI Identification in Two-Step RACH
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Solution Overview
Problem
The existing methods for determining the identity of wireless devices during a random access procedure in wireless communications networks, particularly in the context of the 2-step RACH procedure, fail to clearly differentiate between MsgB RNTI and RA-RNTI, leading to potential conflicts and limitations in available RNTI values for other types like C-RNTI.
Innovation Solution
A method and apparatus for determining MsgB RNTI by adding an offset greater than 1 to the RA-RNTI calculation, based on the indices of OFDM symbol, frequency resource, and time slot, ensuring distinct identification of wireless devices in the 2-step random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing method for determining RNTI identity is used in 2-step RACH procedure, then the procedure can be implemented, but MsgB RNTI and RA-RNTI cannot be clearly differentiated leading to conflicts
Solution Approach 1:
The patent applies parameter changes by modifying the RNTI value calculation formula. Specifically, it introduces an offset parameter (greater than 1) to the RA-RNTI calculation to generate MsgB RNTI, transforming the original single-parameter identification system into a two-parameter system that clearly distinguishes between MsgB RNTI and RA-RNTI while avoiding value conflicts
2Productivity
If existing RNTI calculation method is used, then implementation is simple, but available RNTI values for other types like C-RNTI are limited due to conflicts
Solution Approach 1:
The patent applies segmentation by dividing the RNTI value space into distinct segments. By introducing an offset greater than 1, it creates separate value ranges for MsgB RNTI and RA-RNTI, preventing overlap and ensuring sufficient RNTI values remain available for other types like C-RNTI, thus segmenting the previously conflicting value space
3Ease of operation
If MsgB RNTI and RA-RNTI use the same calculation method, then the procedure is easier to implement, but conflicts arise reducing reliability
Solution Approach 1:
The patent applies local quality by making the RNTI calculation method specific to each RNTI type. While maintaining the same base calculation structure for both MsgB RNTI and RA-RNTI, it introduces a localized differentiation through the offset parameter that applies only to MsgB RNTI, preserving implementation simplicity while ensuring reliable differentiation
Data Source
AI summary
A method performed by a wireless device for determining an identity of the wireless device, MsgB RNTI, in a wireless communications network during a random access procedure is provided. The wireless device transmits a random access preamble on a RACH at a random access occasion. It also transmits a message on a PUSCH that corresponds to the random access preamble. Further, the wireless device determines an MsgB RNTI as the sum of a first identity, RA-RNTI, and an offset that is an integer greater than 1, wherein the RA-RNTI is based on a sum comprising terms corresponding to at least the index of a first OFDM symbol, the index of a frequency resource, and the index of a first time slot that identifies the time/frequency resources of the random access occasion.