2-Step RACH RNTI Offset Determination for MsgB Identification
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Solution Overview
Problem
Existing communication systems face challenges in efficiently synchronizing communications between terminals and radio nodes in wireless networks, particularly in determining unique radio network temporary identifiers (RNTIs) for different message types in multi-step contention-based random access procedures.
Innovation Solution
The method involves determining an offset to calculate a first radio network temporary identifier (RNTI) for subsequent message transmissions, ensuring that the RNTI for MsgB has a distinct value from that of Msg2 while maintaining the same total RNTI space, thereby allowing the same PDCCH search space monitoring occasions and CORESET to be used for both Msg2 and MsgB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate RNTI space is allocated for MsgB in 2-step RACH procedures, then unique identification is achieved, but the total RNTI space size increases
Solution Approach 1:
The patent merges the RNTI spaces for Msg2 and MsgB by using a single RA-RNTI for both message types. The network equipment determines a single RA-RNTI based on time-frequency resources, and both Msg2 and MsgB are addressed using this same identifier, eliminating the need for separate RNTI allocations while maintaining unique identification capability.
Solution Approach 2:
The RA-RNTI is designed to serve multiple functions simultaneously - it identifies both Msg2 and MsgB transmissions. The same RNTI value is used across different message types and procedures (4-step and 2-step RACH), making the identifier universal and eliminating the need for procedure-specific or message-type-specific RNTI spaces.
2Loss of information
If different RNTIs are used for Msg2 and MsgB, then message differentiation is achieved, but device complexity increases
Solution Approach 1:
The patent combines the identifier management for Msg2 and MsgB into a single RA-RNTI determination process. The network equipment calculates one RA-RNTI value based on the time-frequency resources used for the random access preamble, and this same identifier is applied to both Msg2 and MsgB transmissions, simplifying the device complexity while maintaining message differentiation through context rather than separate identifiers.
Data Source
AI summary
Apparatuses, methods, and computer programs for determining and using a radio network temporary identifier are disclosed. A method includes determining an offset; determining a first radio network temporary identifier based, at least partially, upon the offset; and using the first radio network temporary identifier for subsequently transmitting a message to a device.