Initial Access LCID Mapping for RedCap UE Uplink Signaling
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Solution Overview
Problem
The challenge in wireless communication systems is to efficiently perform initial access and indicate different information through a logical channel identifier (LCID) field set to the same value based on system information, particularly for RedCap UEs with reduced capabilities.
Innovation Solution
A method and device for performing initial access in a wireless communication system, where a user equipment (UE) receives system information and a random access response (RAR) from a base station, and transmits a physical uplink shared channel (PUSCH) with a medium access control (MAC) subheader, utilizing a logical channel identifier (LCID) field that distinguishes between different UE functions based on the system information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same LCID field value is used to indicate different information, then the system can support multiple UE types (first function-based UE and second function-based UE) with reduced capability requirements, but the system complexity increases due to the need for system information interpretation and conditional processing
Solution Approach 1:
The patent applies local quality by making the LCID field interpretation context-dependent. The same LCID value can indicate different logical channels based on the system information configuration. Specifically, when system information indicates support for first function-based UEs, the LCID value corresponds to a first logical channel; otherwise, it corresponds to a second logical channel. This allows differentiated treatment in different system contexts without requiring separate LCID values for each UE type.
Solution Approach 2:
The patent implements dynamics by making the LCID field meaning dynamic rather than static. The interpretation of the LCID field changes based on the system information received from the base station. The UE dynamically adjusts its understanding of the LCID value according to whether the system supports first function-based UEs, allowing the same field to serve multiple purposes adaptively.
2Productivity
If system information is used to differentiate information indication for different UE types, then the system can efficiently support RedCap UEs with reduced capabilities, but the information transmission overhead increases
Solution Approach 1:
The patent applies universality by making the existing LCID field multi-functional. Instead of introducing separate fields or increased overhead for differentiating UE types, the patent reuses the existing LCID field to serve multiple purposes. The same field can indicate different logical channels depending on the system information, thereby supporting both traditional UEs and first function-based UEs without additional overhead.
Solution Approach 2:
The patent implements parameter changes by altering the interpretation of the LCID field parameter based on system information. Rather than changing the physical structure or size of the field, the patent changes its semantic meaning according to the system configuration. This allows efficient support for RedCap UEs by simply interpreting the existing parameter differently based on system capabilities.
Data Source
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AI summary
A method and apparatus for performing communication in a wireless communication system are disclosed. A method performed by a user equipment (UE) according to an embodiment of the present disclosure may include receiving system information related to a first cell from a base station; receiving a random access response (RAR) based on a random access channel (RACH) preamble from the base station; and based on the RAR and the system information, transmitting a physical uplink shared channel (PUSCH) including a medium access control (MAC) subheader of a MAC protocol data unit (PDU) to the base station, and based on whether the system information includes first information related to a first function-based UE, a first value of a logical channel identifier (LCID) field of the MAC subheader is related to second information about a second function-based UE or is related to third information about a first function-based UE.