MAC Subheader Reporting for Flexible RACH UE Capability Signaling
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Solution Overview
Problem
The existing methods for reporting UE capabilities during the RACH procedure in wireless communication systems face limitations due to the limited number of coding points in Logical Channel Identifiers (LCIDs) and poor flexibility in indicating assisting information, which is exacerbated by the growing requirements for UE capabilities.
Innovation Solution
An early assisting information report method and apparatus that utilizes a specific MAC subheader to carry UE capabilities, allowing for flexible indication without increasing message size, by configuring terminals and base stations to use a dedicated MAC subheader with an early assisting information field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LCID is used to indicate assisting information during RACH procedure, then the assisting information can be reported, but the number of coding points is limited and flexibility is poor
Solution Approach 1:
The patent introduces a new dimension for indicating assisting information by using a combination of LCID and a new indication field, rather than relying solely on LCID coding points. This allows the system to encode more information states without consuming additional LCID points, effectively transitioning from a 1D coding approach to a 2D coding approach where the assistance information is indicated through the joint state of LCID and the new field.
Solution Approach 2:
The patent segments the assisting information indication into two parts: the LCID field and a new indication field. This segmentation allows the LCID to maintain its original function of identifying logical channels while the new field specifically carries the assisting information, enabling independent optimization of each field and avoiding the limitation of having to encode all information within the constrained LCID space.
2Loss of information
If multiple types of assisting information are reported using LCID, then comprehensive capability information is provided, but the consumption of coding points accelerates
Solution Approach 1:
The patent makes the new indication field a universal container for various types of assisting information, including UE capability information, NTN-specific parameters, and other configuration details. This single field can represent multiple different information types through different encoding values, allowing comprehensive capability reporting without requiring separate LCID points for each information type.
3Loss of information
If PUSCH message size is increased to carry UE capability information, then complete capability reporting is achieved, but the overall coverage of RACH is impacted
Solution Approach 1:
The patent extracts the assisting information from the main PUSCH message payload and places it in a dedicated indication field within the MAC subheader structure. This extraction allows the capability information to be reported efficiently without bloating the overall message size, as the indication field uses compact encoding to represent multiple information states.
Data Source
AI summary
Embodiments of the present disclosure provide early assisting information report method and apparatus. The method includes: receiving, from a base station, configuration information relevant to early assisting information report; and sending a Media Access Control Protocol Data Unit (MAC PDU) to the base station according to the configuration information, where the MAC PDU includes a specific MAC subheader carrying an early assisting information field.