Relay Node Special Sub-Frame Guard Period Configuration
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Solution Overview
Problem
In wireless communication systems, relay nodes operating in TDD mode face challenges in designing access and backhaul links due to interference and resource sharing issues, particularly in configurations with different UL/DL splits, leading to difficulties in scheduling and potential loss of acknowledgments, which affects system capacity and user experience.
Innovation Solution
The implementation of special sub-frames with guard periods allows relay nodes to communicate with the eNB during UE guard periods, enabling backward-compatible designs that multiplex access and backhaul links, reduce interference, and optimize resource usage by configuring the sub-frames to accommodate different configurations and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If relay nodes share the same resources as UEs to reduce infrastructure cost, then CAPEX and OPEX are reduced, but interference between backhaul and access links increases
Solution Approach 1:
The patent segments the time resources by introducing special subframes with guard periods that separate backhaul and access link transmissions. This time-division segmentation allows the relay node to share resources with UEs while preventing interference through structured temporal separation of different communication functions.
Solution Approach 2:
The patent implements periodic guard periods within the TDD frame structure at the relay node. These periodic time gaps are systematically inserted to separate backhaul reception from access transmission, creating a rhythmic pattern that prevents interference while maintaining resource sharing benefits.
2Productivity
If relay nodes multiplex backhaul and access links to optimize resource usage, then resource efficiency improves, but scheduling complexity increases
Solution Approach 1:
The patent enables dynamic configuration of TDD uplink-downlink patterns at the relay node, allowing the system to adapt the timing and duration of guard periods and transmission slots based on traffic conditions. This dynamic approach optimizes resource efficiency while providing flexibility to manage scheduling complexity through adaptive resource allocation.
Solution Approach 2:
The patent changes the temporal parameters of resource allocation by introducing configurable guard periods and special subframes. By adjusting these time parameters dynamically, the system achieves efficient resource multiplexing while simplifying scheduling decisions through standardized parameter sets rather than complex ad-hoc scheduling.
3Adaptability or versatility
If relay nodes operate in TDD mode with different UL/DL configurations to accommodate diverse traffic, then adaptability improves, but interference management becomes difficult
Solution Approach 1:
The patent introduces guard periods as intermediary time intervals between backhaul and access link transmissions at the relay node. These intermediary periods act as buffers that isolate interfering signals, allowing the system to support different TDD configurations for diverse traffic patterns while preventing interference through the mediating guard period structure.
Solution Approach 2:
The patent resolves interference issues by transitioning from frequency-domain separation to time-domain separation through the introduction of special subframes and guard periods. This dimensional change in resource allocation allows flexible TDD configurations for adaptability while managing interference through temporal rather than spectral isolation.
Data Source
AI summary
A method in a relay node operating in a time division duplex system wherein the relay node transmits downlink pilot timeslot information to a user terminal in a first temporal region of a special sub-frame, communicates with a base station during a second temporal region of the special sub-frame, and configures a third temporal region of the special sub-frame, wherein the second temporal region is configured as a guard period for communications between the relay node and the user terminal.