Adaptive MAC CE Sizing for Beam Failure Reporting
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Solution Overview
Problem
The transmission of MAC CE for beam failure reporting is hindered due to inappropriate size, especially in scenarios where specific resources are not configured by the network, leading to contention-based random access failures.
Innovation Solution
The method involves generating and sending MAC CE based on the size of available uplink resources, including UL grants from RAR or preconfigured grants, and truncating the MAC CE if necessary to fit within these resources, ensuring proper transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the network side configures a fixed size for Msg3 resource in random access response, then the resource allocation is simplified, but the MAC CE may not be transmitted when its size is inappropriate
Solution Approach 1:
The patent applies dynamics by making the MAC CE size adaptive rather than fixed. The terminal device determines the actual size of the MAC CE based on the available uplink resource size in the random access response, and adjusts the MAC CE size accordingly. This dynamic adjustment ensures that the MAC CE can be transmitted successfully regardless of the predefined Msg3 resource size, resolving the contradiction between simplified resource allocation and transmission reliability.
2Device complexity
If the terminal device uses a fixed-size MAC CE for beam failure reporting, then the implementation is simplified, but transmission failures occur when the MAC CE size does not match available uplink resources
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the MAC CE size parameter based on the available uplink resource size. Instead of using a fixed MAC CE size, the terminal device calculates the appropriate size based on the random access response's uplink grant information. This parameter adjustment ensures that the MAC CE fits within the allocated resources, preventing transmission failures while maintaining implementation simplicity.
3Device complexity
If the network side does not configure specific resources for BFR, then the configuration complexity is reduced, but the terminal device cannot perform beam failure recovery effectively
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine the appropriate MAC CE size based on the available uplink resources in the random access response. When the network does not configure specific BFR resources, the terminal device uses the self-service mechanism to adaptively size the MAC CE according to the actual uplink grant, ensuring successful beam failure recovery without requiring complex network configuration.
Data Source
AI summary
Embodiments of the present application relate to a method for sending media access control control element and a terminal device, where the method includes: the terminal device sends a media access control (MAC) control element (CE) for reporting beam failure according to a size of an available uplink resource in a random access process. The embodiment of the present application can avoid transmission failure caused by an inappropriate size of the MAC CE for reporting beam failure.