Network Coding Mitigates Blockage in Spatial Division Multiplexing Beams
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Solution Overview
Problem
Wireless communication systems using high frequency bands for beamformed communications are vulnerable to blockage, leading to temporary disruptions and increased latency due to retransmissions.
Innovation Solution
Implementing network coding techniques by configuring some transmit beams to carry parity information for other beams, allowing for the recovery of blocked data through iterative soft decision decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamformed communications are used at high frequency bands, then data transmission capacity is improved, but vulnerability to blockage increases causing disruptions and latency
Solution Approach 1:
The system performs preliminary actions by transmitting parity information on selected transmit beams before data blockage occurs. This parity information is prepared in advance and stored at the receiver, enabling rapid recovery when blockage happens without requiring complex real-time computations during the blockage event.
Solution Approach 2:
Parity information acts as an intermediary element between the transmitted data and the receiver. Instead of directly transmitting redundant data on all beams, the system uses parity information as a mediator that can be combined with received data through XOR operations to recover original information, reducing overhead while maintaining reliability.
2Reliability
If retransmissions are performed after blockage, then data integrity is maintained, but latency increases
Solution Approach 1:
The system performs preliminary actions by pre-computing and transmitting parity information before blockage occurs. When blockage is detected, the receiver can immediately use the stored parity information and successfully received beams to recover blocked data through XOR operations, eliminating the need for time-consuming retransmissions and significantly reducing latency.
3Reliability
If parity information is carried on transmit beams, then recovery from blockage is enabled, but beam configuration complexity increases
Solution Approach 1:
The system segments the transmit beams into different functional groups: some beams carry data information while others carry parity information. This segmentation allows the receiver to process different beam types separately and combine them appropriately, simplifying the overall configuration management while enabling robust recovery capabilities.
Solution Approach 2:
The transmit beams are designed with multi-functionality, where selected beams can serve dual purposes: carrying both data and parity information simultaneously. This universal approach reduces the total number of beams required compared to dedicated data-only and parity-only beam configurations, thereby reducing system complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling indicating a network coding configuration for a set of transmit beams, each transmit beam in the set of transmit beams being spatial division multiplexed with respect to the other transmit beams of the set. The UE may identify based at least in part on the control signaling, a first set of one or more transmit beams of the set of transmit beams carrying parity information for a second set of one or more transmit beams in the set of transmit beams. The UE may perform beamformed communications over the set of transmit beams in accordance with the network coding configuration and the parity information.