Multi-Radio MAC Scheduling for Bounded Wireless Delay
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Solution Overview
Problem
Wireless protocols like IEEE 802.11x suffer from unpredictable delays due to collision avoidance mechanisms, leading to inconsistent quality of service (QoS) when multiple access points share transmissions with common priority, especially in scenarios with overlapping basic service sets (OBSS) causing interference.
Innovation Solution
Implementing a multi-radio media access control (MRM) system with multiple transceiver modules, each with a unique MAC address, that aggregates packets in a shared queue and transmits them asynchronously over multiple channels with different frequencies, allowing simultaneous transmission and reordering to ensure higher service-level agreement compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSMA/CA collision avoidance mechanism is used, then collision between transmissions is avoided, but unpredictable delay is introduced before each transmission
Solution Approach 1:
The system segments the transmission medium into multiple independent radio channels, each operating on a different frequency. Multiple transceiver modules simultaneously access different channels, eliminating the need for CSMA/CA collision avoidance on a single shared medium while reducing unpredictable delays through parallel transmission paths.
Solution Approach 2:
The invention transitions from single-dimensional (single frequency) transmission to multi-dimensional (multiple frequencies) transmission. By adding the frequency dimension, multiple transmissions can occur simultaneously without collision, resolving the trade-off between collision avoidance and transmission delay.
2Ease of operation
If time sharing is used for multiple access points with common priority, then fair access to the medium is achieved, but delay is increased due to waiting for other transmissions
Solution Approach 1:
The system segments the transmission medium into multiple independent radio channels with different frequencies. Multiple access points can simultaneously transmit on different channels without time sharing, achieving fair access through channel diversity rather than temporal allocation, thereby eliminating waiting delays.
Solution Approach 2:
The invention adds the frequency dimension to the transmission medium, allowing multiple access points to operate simultaneously on different frequencies. This transforms the single-channel time-sharing system into a multi-channel parallel system, eliminating waiting time while maintaining fair access through channel allocation.
3Device complexity
If single radio transmission channel is used, then device complexity is reduced, but air winning rate and transmission reliability are decreased
Solution Approach 1:
The system segments the transmission function into multiple independent transceiver modules, each handling a different frequency channel. This segmentation increases reliability and air winning rate by providing multiple parallel transmission paths, while the modular architecture manages complexity through standardized module design.
Solution Approach 2:
The invention merges multiple transceiver modules into a single MRM device that shares common resources (memory, processing, queue management). This consolidation achieves high reliability through multiple radio channels while controlling overall device complexity by sharing infrastructure components across modules.
Data Source
AI summary
A multi radio media access control (MAC) (MRM) transceiver includes a plurality of transceiver systems, each transceiver system assigned a different MAC address, and a memory configured to aggregate, in a shared queue, a plurality of packets of a data stream received via a computer network. Each of the transceiver systems is configured to asynchronously acquire one or more of the packets from the shared queue for transmission in one of a plurality of transmission channels. Each one of the transmission channels comprises a different frequency. The transmission channels are maintained for simultaneous transmission of the one or more packets to a common target user equipment (UE) that is wirelessly coupled to the MRM transceiver.