MAC Layer State Control for Wireless MSS Power Optimization
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Solution Overview
Problem
Current 4G communication systems, such as IEEE 802.16e, face inefficiencies in power consumption and message overhead due to the need for MSSs to perform handovers and periodic ranging in both awake and sleep states, especially when there is no traffic, and they do not effectively manage radio resources for mobile subscriber stations.
Innovation Solution
Introducing an idle state in the MAC layer where MSSs can measure pilot channel signals and receive system information without transmitting or receiving traffic, and implementing a paging zone system to minimize power consumption and message overhead by allowing MSSs to change locations and register only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MSSs perform handovers and periodic ranging in both awake and sleep states, then mobility support is maintained, but power consumption increases
Solution Approach 1:
The patent introduces three dynamic operation states (awake, sleep, and idle) for MSSs, allowing the system to flexibly transition between states based on traffic conditions and mobility requirements. In the idle state, MSSs can move between paging zones without performing full handover procedures, reducing power consumption while maintaining mobility support.
Solution Approach 2:
The patent implements a paging zone concept where the service area is divided into multiple zones. MSSs in the idle state can move within or between paging zones with simplified procedures compared to full handover. This local quality differentiation allows mobility support with reduced power consumption for low-activity users.
2Reliability
If MSSs perform periodic ranging in awake and sleep states, then connection maintenance is ensured, but message overhead increases
Solution Approach 1:
The patent dynamically adjusts ranging requirements based on the operation state. In the idle state, MSSs perform simplified location update procedures only when crossing paging zone boundaries, rather than periodic ranging. This reduces message overhead while maintaining the ability to locate MSSs when needed.
Solution Approach 2:
The patent extracts the essential function of location tracking from the full handover/ranging procedure. In the idle state, only minimal location update information is exchanged when crossing paging zones, separating the basic location maintenance function from the more resource-intensive connection maintenance procedures.
3Speed
If MSSs remain in awake state to handle traffic quickly, then data transmission speed is improved, but power consumption increases
Solution Approach 1:
The patent enables dynamic state transitions between awake, sleep, and idle states based on traffic conditions. When traffic is present, MSSs transition to the awake state for rapid data transmission. When no traffic is present, MSSs enter the idle or sleep states to conserve power, transitioning back to awake only when traffic arrives.
4Reliability
If MSSs perform full handover procedures when moving between cells, then service continuity is maintained, but device complexity increases
Solution Approach 1:
The patent introduces paging zones as intermediate management units between cells. When MSSs in idle state move within or between paging zones, simplified location update procedures are used instead of full handover. Full handover procedures are performed only when necessary to maintain service continuity, reducing overall procedural complexity.
Data Source
AI summary
An apparatus and method for controlling operation states of a medium access control layer by a mobile subscriber station (MSS) in a broadband wireless access communication system. The method includes: state-transitioning into a sleep state or an idle state when there is no data transmitted between a base station and the MSS during a predetermined first time interval in an awake state; and performing a location change in the idle state when the mobile subscriber station moves from a first paging zone to a second paging zone, and state-transiting into the awake state when the mobile subscriber station in the idle state detects a paging to the mobile subscriber station. The method minimizes power consumption and maximizes efficiency in use of radio resources.