Sleep-Mode Wireless Cell Reselection for Packet Loss Prevention
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Solution Overview
Problem
In wireless packet-switched networks, mobile nodes without macro-diversity capability experience packet loss during handoffs due to the inability to maintain connections during sleep intervals, as downlink packets buffered at the prior-serving base station are lost when the mobile node moves out of range.
Innovation Solution
The system buffers and forwards downlink packets to a mobile node during handoffs by updating its sleep identification and retrieving the service context and buffered packets from the originating base station through the ASN gateway server, ensuring seamless connectivity and packet delivery during sleep mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If mobile nodes enter sleep mode to conserve battery power and air link resources, then energy consumption is reduced, but packet loss occurs during handoffs when nodes move out of range of the serving base station
Solution Approach 1:
The system performs preliminary actions by buffering downlink packets at the serving base station before the mobile node actually needs them. The base station anticipates potential handoff scenarios and prepares packet buffers in advance, so when a handoff occurs during sleep mode, packets are already ready to be forwarded to the target base station without loss.
Solution Approach 2:
The serving base station acts as an intermediary between the packet source and the mobile node during sleep mode handoffs. It receives downlink packets, buffers them, and forwards them to the target base station, mediating the packet delivery process to ensure continuity when the mobile node transitions between base stations during inactive periods.
2Loss of energy
If mobile nodes remain in sleep mode during handoffs, then energy consumption is minimized, but connection continuity is lost and packets cannot be delivered
Solution Approach 1:
The system establishes preliminary packet buffering arrangements before handoff occurs. The serving base station pre-configures packet buffers and maintains service context information, so when handoff occurs during sleep mode, the transition is seamless and requires no additional energy expenditure from the mobile node.
Solution Approach 2:
The base station performs self-service by autonomously managing packet buffering and forwarding operations without requiring mobile node participation. The serving base station automatically forwards buffered packets to the target base station using the mobile node's sleep identification, eliminating the need for the mobile node to wake up and manage handoff procedures.
3Reliability
If the system implements packet buffering and forwarding mechanisms for sleep-mode handoffs, then packet delivery reliability is improved, but system complexity increases
Solution Approach 1:
The system uses preliminary action by pre-buffering packets at the serving base station before handoff occurs. This approach simplifies the overall system architecture compared to more complex solutions that would require continuous monitoring, wake-up signaling, or coordinated multi-base station buffering, as the buffering decision is made in advance based on sleep mode detection.
4Use of energy by moving object
If mobile nodes without macro-diversity capability enter sleep mode, then power savings are achieved, but the ability to maintain network connection during handoffs is lost
Solution Approach 1:
The serving base station acts as an intermediary that compensates for the mobile node's lack of macro-diversity capability. By buffering packets and autonomously forwarding them to the target base station using the mobile node's sleep identification, the serving base station enables reliable packet delivery without requiring the mobile node to maintain active connections or perform complex handoff procedures.
Data Source
AI summary
Embodiments herein may receive a ranging request message with a sleep-mode indication from a mobile node at a destination base station in a wireless packet-switched network. System paging information may be accessed to determine a base station identifier associated with an originating base station that last served the mobile node. The originating base station may be contacted to retrieve a service context associated with the mobile node and any downlink packets buffered for the mobile node by the originating base station. Other embodiments may be described and claimed.