Downlink RRC Message Segmentation for Oversized PDCP SDUs
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Solution Overview
Problem
The existing 5G communication systems face challenges in handling UE capability information messages and downlink RRC messages that exceed the maximum size of a PDCP SDU, leading to inefficiencies and the lack of defined operations when segmentation is permitted.
Innovation Solution
A method is introduced to segment and deliver RRC messages exceeding the maximum size, with defined UE operations for radio link failure (RLF) handling and base station procedures for generating and transmitting segmented RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If RRC messages larger than maximum PDCP SDU size are transmitted, then configuration information can be delivered to UE, but the message cannot be transmitted due to size limitation
Solution Approach 1:
The RRC message is divided into multiple segments (first segmented RRC message and second segmented RRC message) when the total message size exceeds the maximum PDCP SDU size. Each segment is transmitted separately through the PDCP layer, allowing large configuration information to be delivered without violating size constraints. The UE reassembles the segments to recover the original RRC message.
2Quantity of substance
If segmented RRC messages are transmitted, then large configuration information can be delivered, but transmission delay increases
Solution Approach 1:
The RRC message is segmented into multiple parts before transmission at the base station side. By pre-segmenting the message, the system avoids the need for complex runtime segmentation and enables parallel or sequential transmission of segments, reducing overall transmission delay compared to transmitting the entire message as a single unit after all data is prepared.
Solution Approach 2:
The segmented RRC messages are transmitted in periodic or sequential manner through different PDCP SDUs, allowing the transmission to be spread over time intervals that match the channel capacity and UE processing capabilities, thereby optimizing delivery timing and reducing blocking delays.
3Quantity of substance
If segmented RRC messages are stored at UE, then complete configuration information can be received, but memory usage increases
Solution Approach 1:
The configuration information is divided into multiple segments that are transmitted and stored separately in the UE buffer. Instead of storing one large message, the UE stores multiple smaller segmented messages (first segmented RRC message and second segmented RRC message), which reduces the peak memory requirement and allows for more efficient buffer management and potential early processing of individual segments.
Data Source
AI summary
The disclosure relates to a communication technique for convergence between an IoT technology and a 5G communication system for supporting higher data transmission rate than a 4G system, and a system thereof. The disclosure may be applied to intelligence services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety related services, etc.) on the basis of a 5G communication technology and an IoT-related technology. According to an embodiment of the present discourse, a method of a terminal in a communication system may comprise the steps of: receiving, from a base station, at least one segmented radio resource control (RRC) message including a part of an RRC message which has a size larger than a preconfigured size; storing the at least one received segmented RRC message; identifying that a radio link failure (RLF) has occurred with respect to the base station; and discarding the stored segmented RRC message upon the occurrence of the radio link failure.