Base Station Terminal State Management in 5G Wireless Systems
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently managing the state of terminals, particularly in allocating resources for context information across different protocol layers, leading to limited capacity and wastage of hardware resources when terminals are not actively communicating.
Innovation Solution
A method and apparatus that dynamically allocate resources for terminal context information across the packet data convergence protocol (PDCP), radio link control (RLC), and media access control (MAC) layers based on whether data is generated, allowing the base station to change the terminal's state between actively scheduled (AS) and semi-actively scheduled (SAS) states, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources for terminal context information are allocated in both first layer and second layer, then data communication capability is maintained, but hardware resources are wasted when terminal is not actively communicating
Solution Approach 1:
The patent introduces dynamic state transitions between AS and SAS states, allowing the resource allocation configuration to change based on terminal activity. The base station monitors terminal data generation and transitions terminals between states, dynamically adjusting resource allocation from full (AS) to partial (SAS) to match actual communication needs.
Solution Approach 2:
The patent changes the parameter of resource allocation by introducing a new state variable (SAS state) that modifies how resources are allocated. In SAS state, the terminal maintains context information in the first layer but releases resources in the second layer, effectively changing the resource allocation parameters based on communication activity levels.
2Reliability
If maximum number of terminals are supported with full resource allocation, then communication quality is maintained, but system capacity is limited
Solution Approach 1:
The patent segments the resource allocation into two distinct layers: first layer (RRC layer) that maintains context information, and second layer (L2 layer) that handles active data communication resources. By segmenting resources this way, the system can maintain communication quality in the first layer while releasing expensive second layer resources in SAS state, thereby increasing overall system capacity.
Solution Approach 2:
The first layer (RRC layer) serves a universal function by maintaining context information for terminals in both AS and SAS states. This universal resource allocation allows the system to support more terminals overall, while the second layer provides specialized active communication resources only when needed, achieving multi-functionality that improves system capacity.
3Loss of energy
If terminal state is changed to release resources in second layer, then hardware resource efficiency is improved, but data communication capability is reduced
Solution Approach 1:
The patent applies preliminary action by maintaining context information in the first layer (RRC layer) before the terminal actually needs to communicate. This preliminary maintenance of essential information allows the terminal to quickly transition back to AS state and resume full communication capability when data generation is detected, minimizing the impact of resource release in the second layer.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). An apparatus and an operation method of a base station in a wireless communication system are provided. The method may include performing data communication with a terminal that is in a first sub-state of a radio connection state, and controlling to change the state of the terminal from the first sub-state to a second sub-state of the radio connection state on the basis of whether data related to the terminal is generated during a transfer duration. Here, the first sub-state is a state in which resources for terminal context information related to the data communication are allocated in a first layer and a second layer, and the second sub-state is a state in which the resource is allocated in the first layer and is released in the second layer.