RRC INACTIVE State Sequence Number Management for Wireless Data Transmission
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Solution Overview
Problem
In wireless communication systems, the limited radio resources available to base stations for communication with user equipment (UEs) lead to challenges in efficiently transmitting and receiving data and control information, particularly in reducing delay or latency.
Innovation Solution
A method for transmitting data units by a user equipment (UE) in a wireless communication system, involving the transmission of first and second data units in different Radio Resource Control (RRC) states with specific sequence numbers, where the sequence number for the RRC INACTIVE state is incremented by 1 for every second data unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data units are transmitted in RRC INACTIVE state with sequence numbers, then data transmission efficiency is improved, but reordering delay occurs when previous data is lost
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink resources and establishing sequence number management before data transmission in RRC INACTIVE state. The UE is pre-configured with uplink resources and sequence number ranges, allowing immediate data transmission without waiting for resource allocation or connection establishment, thus improving transmission efficiency while avoiding reordering delays through proactive resource preparation
Solution Approach 2:
The patent employs disposable sequence numbers for RRC INACTIVE state transmissions that are discarded when transitioning to RRC CONNECTED state. These temporary sequence numbers enable efficient data transmission during the inactive state without requiring long-term maintenance or complex reordering mechanisms, allowing the system to abandon them when no longer needed, thus reducing complexity and avoiding reordering delays
2Reliability
If RRC connection is maintained in CONNECTED state, then data transmission reliability is improved, but radio resource consumption increases
Solution Approach 1:
The patent implements dynamic RRC state management, allowing the UE to transition between CONNECTED and INACTIVE states based on data transmission requirements. The system dynamically adjusts the RRC state and sequence number management strategy according to current network conditions and data urgency, optimizing the balance between transmission reliability and resource consumption by being active only when necessary
Solution Approach 2:
The patent segments data transmission into two distinct phases: RRC CONNECTED state for reliable, resource-intensive transmissions and RRC INACTIVE state for efficient, low-resource transmissions. By dividing the transmission process into these segments with different reliability and resource characteristics, the system can optimize overall performance by selecting the appropriate segment for each data transmission task
Data Source
AI summary
The present invention relates to a method of transmitting data units by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of transmitting at least first one data unit in a Radio Resource Control (RRC) CONNECTED state with a sequence number for the RRC CONNECTED state; receiving a RRC INACTIVE transition command with an initial sequence number for data transmission in a RRC INACTIVE state; setting a sequence number for the RRC INACTIVE state as the initial sequence number; and transmitting at least one second data unit in the RRC INACTIVE state with the sequence number for the RRC INACTIVE state, wherein the sequence number for the RRC INACTIVE state is incremented by 1 for every second data unit.