Random Access Procedure for BSR Transmission in LTE
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Solution Overview
Problem
In LTE mobile communication systems, User Equipment (UE) allocated no scheduling request resources faces challenges in transmitting Buffer Status Reports (BSR) to an Evolved Node B (ENB) through the random access procedure, as no defined method exists for this process.
Innovation Solution
A method and apparatus for a UE to perform a random access procedure by transmitting a preamble, receiving UL transmission resource information, and generating a message that includes BSR information, using a format indicator to determine whether the message contains a transparent RRC message or BSR information, allowing the UE to send BSR messages to the ENB through the random access procedure even without allocated scheduling request resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a UE is allocated no scheduling request resources, then the ENB can reduce resource allocation complexity, but the UE cannot transmit BSR messages through the scheduled request procedure
Solution Approach 1:
The random access procedure is enhanced to serve dual purposes: traditional UE access and BSR message transmission for UEs without scheduling request resources. By making the random access procedure universal, it can handle both connection establishment and buffer status reporting functions, allowing UEs without dedicated scheduling resources to still communicate their buffer status to the ENB.
Solution Approach 2:
The patent introduces a format indicator as an intermediary element in the message structure transmitted during random access. This format indicator acts as a mediator that enables the ENB to correctly interpret whether the message contains a transparent RRC message or BSR information, facilitating reliable communication for UEs without scheduling request resources.
2Adaptability or versatility
If the random access procedure is enhanced to support BSR transmission, then UE communication flexibility is improved, but message format identification complexity increases
Solution Approach 1:
The patent uses a format indicator as a signaling mechanism that changes the 'color' or identification characteristic of the message format. This indicator provides a clear, distinguishable signal to the ENB about the message type (transparent RRC message vs. BSR information), enabling easy identification without complex parsing procedures.
3Productivity
If UL transmission resources are allocated for random access BSR transmission, then data transmission efficiency is improved, but resource allocation fairness may be compromised
Solution Approach 1:
The patent applies partial action by allocating UL transmission resources selectively based on the specific needs of UEs attempting random access for BSR transmission. Rather than providing full resource allocation to all UEs, the system provides sufficient resources only when needed for this specific purpose, balancing efficiency and fairness considerations.
Data Source
AI summary
A method for performing a random access procedure by a User Equipment (UE) in a mobile communication system includes transmitting a preamble for identifying the UE, through a first message; receiving a second message from an Evolved Node B (ENB) in response to the first message, the second message including uplink (UL) transmission resource information for transmitting at least one of a transparent Radio Resource Control (RRC) message which is an RRC message that a UE having no RRC control connection transmits for the first time, and Buffer Status Report (BSR) information indicating an amount of UL data; setting a format indicator indicating if the transparent RRC message or the BSR information is included in a third message; and generating the third message according to the set format indicator, and transmitting the generated third message according to the UL transmission resource information.