Host Relay Station Idle Frame Slot Allocation
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Solution Overview
Problem
In wireless communication systems using time division multiple access (TDMA), unstable network delays between host and subordinate relay stations can lead to inaccurate allocation of time slots, causing communication disruptions and interference between mobile stations.
Innovation Solution
A wireless communication system where the host relay station specifies downlink and uplink time slots at different frequencies and suspends transmission when idle, using an idle frame with slot information to instruct mobile stations to use specific slots, ensuring common slot recognition despite network delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay stations are connected via wired network, then relay transmission can be established, but unstable network delay occurs leading to inaccurate time slot allocation
Solution Approach 1:
The host relay station transmits an idle frame in advance that contains information about which time slots are in use and which are unused. This preliminary action allows mobile stations to know the slot allocation before actual communication begins, compensating for the unstable network delay that would otherwise cause inaccurate time slot allocation.
2Use of energy by moving object
If host relay station suspends transmission when idle, then energy is saved, but mobile stations cannot initiate communication during suspension period
Solution Approach 1:
The subordinate relay station acts as an intermediary that receives transmission start requests from mobile stations during the host relay station's suspension period. It then forwards these requests to the host relay station via the wired network, enabling mobile stations to initiate communication even when the host relay station is not actively transmitting.
Data Source
AI summary
Upon receiving a transmission start request from a first mobile station when a host relay station is suspending transmission, a first subordinate relay station transmits the transmission start request to the host relay station via a network. Upon receiving the transmission start request, the host relay station transmits an idle frame indicating that slots other than one slot are in use. Upon receiving a signal from the first mobile station in the one slot, the first subordinate relay station transmits the signal to the host relay station via the network. The host relay station receives the signal from the first subordinate relay station and uses the one slot for the first mobile station.