Relay Station Frame Structure Asynchronous Uplink Timing
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Solution Overview
Problem
The existing relay wireless communication systems experience degradation in data transmission efficiency due to operation transition gaps in the Relay Station (RS) frame structure, particularly the Transmit/Receive Transition Gap (TTG) and Relay-Transmit/Receive Transition Gap (R-TTG/R-RTG), which lead to overheads and inefficiencies.
Innovation Solution
The proposed solution involves configuring a frame structure in the relay wireless communication system by determining signal delay times and operation transition times through negotiation with upper nodes, setting an idle time to avoid interference, and adjusting the length of Cyclic Prefix (CP) in Orthogonal Frequency Division Multiplexing (OFDM) symbols to reduce or eliminate the TTG and R-TTG/R-RTG overheads, allowing for asynchronous UL subframe configuration of the RS relative to the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operation transition gaps (TTG, R-TTG, R-RTG) are included in the RS frame structure to enable transmission/reception switching, then the RS can perform mode transitions, but data transmission efficiency deteriorates due to overhead losses
Solution Approach 1:
The patent extracts and removes the TTG and relay transition gaps (R-TTG, R-RTG) from the RS frame structure. By taking out these unnecessary transition gaps, the system eliminates the overhead losses they cause while maintaining the RS's ability to perform transmission/reception mode transitions through alternative timing mechanisms.
Solution Approach 2:
The patent changes the timing parameters of the RS frame by setting the uplink subframe start time of the RS differently from the BS frame timing. This parameter change allows the RS to perform mode transitions at different times, eliminating the need for separate transition gaps and thereby improving data transmission efficiency.
2Stability of the object's composition
If the RS frame is synchronized with the BS frame, then frame alignment is maintained, but transition gaps become necessary causing overhead
Solution Approach 1:
The patent introduces asymmetry in frame timing by allowing the RS uplink subframe start time to differ from the BS frame timing. This asymmetric configuration enables the RS to maintain frame synchronization with the BS while avoiding the need for symmetric transition gaps, thereby reducing overhead losses.
3Reliability
If idle time is set in the RS frame to avoid interference, then interference between MS and RS is prevented, but data transmission time is reduced
Solution Approach 1:
The patent performs preliminary timing configuration by setting the RS uplink subframe start time in advance based on the signal delay time between BS and RS. This preliminary action ensures that idle time is optimally positioned to prevent interference between MS and RS transmissions while minimizing the impact on overall data transmission time.
Data Source
AI summary
An apparatus and method for reduces an overhead caused by an operation transition gap in a Relay Station (RS) of a relay wireless communication system. The method includes identifying a signal delay time with an upper node. A transmission/reception operation transition time is determined through a negotiation with the upper node. An idle time is identified. An overhead caused by a transmission/reception operation transition is determined with consideration of a start time point of an Uplink (UL) subframe dependent on the signal delay time, the transmission/reception operation transition time, and the idle time. And communication is performed considering the overhead. The start time point of the UL subframe is set earlier than a start time point of a UL subframe of the upper node in consideration of the idle time.