Wireless Device Soft Combination for High Frequency Robustness
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Solution Overview
Problem
High frequency wireless communication systems face robustness issues due to frequent fading and higher obstacle diffraction loss, making traditional HARQ mechanisms ineffective for providing time domain diversity, which conflicts with latency requirements for C-MTC traffic.
Innovation Solution
Introducing space domain diversity into the traditional HARQ mechanism by enabling a wireless communication device to perform soft combination across multiple network nodes, using assistance information to synchronize data packet searches across different connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HARQ mechanism is used for high frequency spectrum, then time domain diversity is provided, but communication robustness is insufficient due to frequent fading and obstacle diffraction loss
Solution Approach 1:
The patent transitions from time domain diversity (single dimension) to space domain diversity (multiple dimensions) by enabling the wireless communication device to connect to multiple network nodes simultaneously. This dimensional change allows soft combination of data packets received from different spatial paths, significantly improving robustness against high frequency channel fading and obstruction.
Solution Approach 2:
The patent merges multiple data packet reception paths from different network nodes into a unified soft combination process. The wireless communication device combines data packets received through different spatial channels, leveraging diversity gain to overcome the limitations of traditional single-path HARQ in high frequency environments.
2Reliability
If HARQ re-transmission is used to overcome channel blocking, then time domain diversity is achieved, but interruption time in hundreds of milliseconds cannot be solved
Solution Approach 1:
The patent implements preliminary action by pre-establishing multiple connectivity paths to different network nodes before channel blocking occurs. When blocking happens, the device can immediately switch to or combine with alternative paths, avoiding the lengthy re-transmission delays inherent in traditional HARQ and reducing interruption time to levels compatible with C-MTC traffic requirements.
Solution Approach 2:
By introducing spatial diversity through multiple network node connections, the patent creates parallel communication paths that operate independently of each other. This dimensional expansion allows the system to bypass blocked time-domain paths and maintain communication through alternative spatial paths, effectively solving the interruption time problem.
3Reliability
If traditional HARQ mechanism is extended to hundreds of milliseconds re-transmission latency, then robustness improves, but QoS requirement for C-MTC traffic is violated
Solution Approach 1:
The patent resolves this contradiction by moving from time-domain redundancy (extended re-transmission latency) to space-domain redundancy (multiple simultaneous connections). This dimensional shift enables robustness to be achieved through parallel spatial paths rather than sequential time delays, maintaining low latency while improving reliability.
Solution Approach 2:
The patent creates multiple copies of the communication path through connections to different network nodes. Instead of relying on a single path with extended re-transmission, the system maintains multiple active path copies that can be combined through soft combining, achieving robustness without violating QoS latency requirements.
4Reliability
If wireless communication device connects to multiple network nodes, then space domain diversity is achieved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the wireless communication device to autonomously manage its multiple connections and perform soft combination operations without requiring complex network-side coordination. The device independently handles data packet reception, identification, and combining from multiple network nodes, reducing overall system complexity while maintaining robustness.
Data Source
AI summary
The present disclosure provides methods and devices for robustness enhancement in a wireless communication system comprising a plurality of network nodes and a wireless communication device which is configured to be connected to the plurality of network nodes including a first network node. Embodiments disclosed herein describe a first network node, a wireless communication device, a method in the first network node, a method in the wireless communication device, a wireless communication system and a non-transitory machine-readable medium. The method in the first network node comprises the operations of transmitting a data packet to the wireless communication device; generating assistance information indicating to the wireless communication device when to search for the same data packet from at least a second network node of the plurality of network nodes for soft combination; and transmitting the assistance information to the wireless communication device.