Radio Terminal Msg3 Size Selection for Uplink Resource Allocation
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Solution Overview
Problem
Current radio communication systems for Category M UEs in LTE eMTC lack a mechanism to efficiently associate the desired Msg3 size with uplink resource allocation during the random access procedure, leading to potential coverage limitations and resource wastage.
Innovation Solution
A radio terminal and base station configuration that determines the pathloss level and coverage enhancement mode to choose between full and truncated Resume IDs for the initial uplink RRC message, allowing the base station to accurately allocate uplink resources based on the desired Msg3 size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full Resume ID is transmitted in Msg3, then unique UE identification is ensured, but uplink resource allocation becomes inefficient and coverage is limited
Solution Approach 1:
The patent applies partial action by transmitting only a truncated version of the Resume ID (partial identification information) in the Msg3 during random access procedure. This allows the base station to identify the UE with sufficient accuracy while using fewer uplink resources, thus resolving the contradiction between identification accuracy and resource allocation efficiency.
Solution Approach 2:
The patent changes the parameter of Resume ID length from full size to truncated size based on the determined Msg3 size. By dynamically adjusting the identification information length according to resource allocation needs, the system achieves both efficient resource usage and sufficient UE identification capability.
2Loss of information
If Msg3 size is increased to accommodate full Resume ID, then UE identification capability is improved, but pathloss coverage is reduced
Solution Approach 1:
The patent uses partial identification information (truncated Resume ID) instead of the complete Resume ID in Msg3 transmission. This reduces the Msg3 size and consequently the uplink resources required, which directly mitigates the impact of pathloss and extends coverage for Category M UEs.
Solution Approach 2:
The patent dynamically changes the Msg3 size parameter based on the determined coverage enhancement level. By adjusting the amount of identification information transmitted according to channel conditions, the system optimizes both identification capability and pathloss coverage.
3Reliability
If uplink resources are allocated for full Resume ID transmission, then identification reliability is improved, but resource wastage occurs
Solution Approach 1:
The patent transmits only the necessary portion of the Resume ID (truncated version) in Msg3, avoiding the allocation of uplink resources for the complete Resume ID. This eliminates resource wastage while maintaining sufficient identification reliability through the truncated identifier.
Solution Approach 2:
The patent changes the Msg3 size parameter to match the actual identification needs by using truncated Resume ID. This dynamic parameter adjustment ensures that uplink resources are allocated efficiently without excess, thereby preventing resource wastage while maintaining identification reliability.
Data Source
AI summary
A radio terminal (1) determines (201) (a) a pathloss level between the radio terminal (1) and a base station (2), (b) a coverage enhancement level based on the pathloss level, or (c) a coverage enhancement mode configured in the radio terminal (1). The radio terminal chooses (202) between non-truncated first information and truncated first information, having a smaller bit length than the non-truncated first information, to be included in an initial uplink Radio Resource Control (RRC) message transmitted within a random access procedure, based on the determined pathloss level, the determined coverage enhancement level, or the determined coverage enhancement mode. This contributes to, for example, enabling a base station to easily know the Msg3 size desired by a radio terminal.