Multi-Hop Wireless Frame Structure for Relay Station Control
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Solution Overview
Problem
Existing IEEE 802.16-2005 wireless networks face challenges in supporting relay stations due to the need for simultaneous transmission and reception of frame control information, which increases complexity and requires high isolation between transmit and receive paths, making it difficult to achieve in many installations.
Innovation Solution
The method involves transmitting a downlink sub-frame with a first set of frame control information for terminals and a second set for relay stations, positioned differently within the sub-frame, allowing relay stations to receive frame control information at a separate time, reducing the need for simultaneous transmission and reception and enabling efficient multi-hop path support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay stations transmit and receive frame control information simultaneously, then multi-hop transmission can be supported, but device complexity increases and high isolation between transmit and receive paths is required
Solution Approach 1:
The downlink sub-frame is segmented into two distinct parts: a first part carrying frame control information for terminals, and a second part carrying frame control information for relay stations. This temporal segmentation allows relay stations to receive their control information at a different time from when they would need to transmit, eliminating the need for simultaneous transmit/receive operation and reducing equipment complexity requirements.
2Productivity
If relay stations receive frame control information at the same time as transmitting, then efficient transmission can be achieved, but high isolation between transmit and receive paths is required
Solution Approach 1:
By dividing the downlink sub-frame into separate temporal parts for terminal control information and relay station control information, the system eliminates the harmful interference that would occur if relay stations received and transmitted simultaneously. The relay station receives its control information in the second part of the sub-frame after terminals have been served, avoiding interference with its own transmission.
3Reliability
If frame control information for both terminals and relay stations is transmitted, then complete network control is achieved, but downlink sub-frame structure becomes more complex
Solution Approach 1:
The downlink sub-frame structure is segmented into two distinct temporal parts, each carrying frame control information for specific station types. The first part contains information for terminals, while the second part contains information for relay stations. This structured segmentation maintains complete network control while organizing the complexity in a manageable, systematic way that base stations can process efficiently.
Data Source
AI summary
A wireless network includes a base station which can serve terminals directly, or via multi-hop transmission paths via relay stations. The base station transmits a downlink sub-frame which includes a first set of frame control information and a second set of frame control information. The second set of frame control information occupies a different position within the downlink sub-frame compared to the first set of frame control information. A relay station is able to transmit a downlink sub-frame to a terminal, or another relay station, while still being able to receive a set of frame control at a different time during the downlink sub-frame. The invention is especially useful in a wireless network in which the downlink transmissions of a base station and a relay station are synchronized to one another and where the downlink transmissions of a base station and relay station occupy the same, or similar, frequency bearer.