MAC PDU UE Recognition in Contention-Based Wireless Uplink
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Solution Overview
Problem
In wireless communication systems, collisions during contention resource usage lead to difficulties in recognizing specific User Equipment (UE) and efficient data transmission, resulting in performance issues and potential collisions with other UEs.
Innovation Solution
A method where User Equipment (UE) transmits a Medium Access Control Protocol Data Unit (MAC PDU) including UE recognizer information, such as C-RNTI or SR logical index, using contention-based PUSCH resources, allowing the Base Station (BS) to identify the UE even in collision scenarios, enabling efficient scheduling request (SR) transmission and subsequent data transmission without collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based resources are used for uplink data transmission, then resource allocation efficiency is improved and latency is reduced, but collision between multiple UEs occurs making it difficult to recognize specific UEs
Solution Approach 1:
The MAC PDU is segmented into distinct components: MAC header containing LCID for identifier, MAC control elements for additional information, and data payload. This segmentation allows the base station to extract and process UE identification information separately from the data transmission, enabling reliable UE recognition even in collision scenarios.
Solution Approach 2:
The MAC PDU structure with LCID and MAC CE acts as an intermediary mechanism between the contention-based resource and the base station's UE recognition system. By embedding identifier information within the MAC PDU structure, the system mediates between the collision-prone contention resource and the requirement for reliable UE identification.
2Loss of time
If contention-based PUSCH resources are used without UL grant allocation, then transmission latency is reduced, but collision with other UEs increases
Solution Approach 1:
The base station is pre-configured with the ability to decode MAC PDUs containing LCID and MAC CE structures. This preliminary preparation allows the base station to immediately recognize and handle contention-based transmissions without requiring prior UL grant allocation, reducing latency while maintaining collision handling capability.
Solution Approach 2:
The MAC PDU structure provides feedback mechanisms through MAC control elements that can indicate transmission status, collision detection, or scheduling requests. This feedback allows the base station to manage contention-based resources more effectively and reduce future collisions.
3Measurement precision
If MAC PDU with UE recognizer information is transmitted using contention resources, then UE identification capability is improved, but MAC PDU structure complexity increases
Solution Approach 1:
The MAC PDU structure serves multiple functions simultaneously: the LCID provides UE identification, the MAC control elements can carry scheduling requests or buffer status reports, and the data payload carries user data. This multi-functionality reduces the need for separate signaling messages, offsetting the structural complexity with efficiency gains.
Solution Approach 2:
The MAC PDU structure embeds multiple layers of information: the LCID in the MAC header provides outer-layer identification, while MAC control elements nested within contain additional identification or control information. This nested structure efficiently packs multiple functions into a single transmission unit.
Data Source
AI summary
The present specification relates to a method for transmitting medium access control protocol data unit (MAC PDU) in a wireless communication system. The method, which is performed by a terminal, comprises the steps of: transmitting a control signal through a physical uplink channel to a base station; and transmitting the MAC PDU including terminal identifier information for identifying the terminal to the base station using contention resources within contention-based PUSCH zone (CP zone).