Multi-radio coexistence via dynamic medium access control
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Solution Overview
Problem
Wireless communication devices face interference issues between WLAN, low-rate wireless systems, and Bluetooth technologies when they share the same RF medium, particularly due to the stronger WLAN or Bluetooth signals causing receiver blocking and saturation in low-rate wireless system receivers.
Innovation Solution
A multi-radio apparatus with a standard-defined coexistence interface allows transceiver circuits to assert and de-assert medium access requests based on trigger events, enabling communication in different modes to reduce medium access delay and protect occupied RF mediums from interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transceiver circuits communicate concurrently in the ISM band, then communication functionality is enhanced, but receiver blocking and saturation occur due to stronger transmitter signals
Solution Approach 1:
The patent introduces a coexistence manager as an intermediary component that mediates between multiple transceiver circuits. The coexistence manager receives medium access requests from transceiver circuits, evaluates their priority and timing, and grants access to the shared RF medium in a controlled sequence. This mediator prevents simultaneous transmissions that would cause receiver blocking, while still allowing multiple transceivers to communicate concurrently with proper coordination.
2Power
If WLAN transmitter operates at high power, then transmission range is improved, but low-rate wireless system receiver experiences blocking and saturation
Solution Approach 1:
The patent implements a preliminary action mechanism where transceiver circuits must submit medium access requests before transmitting. The coexistence manager processes these requests in advance, determines the transmission schedule, and grants medium access permissions before actual transmission begins. This preliminary coordination ensures that high-power WLAN transmissions are scheduled at times when low-rate wireless system receivers are not actively receiving, preventing blocking before it occurs.
3Object-affected harmful factors
If medium access control is implemented strictly, then interference is reduced, but medium access delay increases
Solution Approach 1:
The patent implements dynamic medium access control where the coexistence manager continuously monitors the state of all transceiver circuits and adjusts medium access grants in real-time. Rather than using fixed, rigid scheduling, the system dynamically prioritizes requests based on current conditions, traffic urgency, and receiver availability. This dynamic approach reduces unnecessary delays while maintaining interference protection through adaptive coordination.
4Device complexity
If transceiver circuits share the same RF medium, then device complexity is reduced, but signal interference increases
Solution Approach 1:
The patent applies segmentation by dividing the shared RF medium access into discrete, controlled time slots and access opportunities for different transceiver circuits. Instead of allowing continuous, uncoordinated sharing that causes interference, the coexistence manager segments the medium access rights and allocates them sequentially to different transceivers based on their requests and priority. This segmentation maintains the physical simplicity of sharing one RF medium while preventing interference through temporal separation.
Data Source
AI summary
An apparatus supporting multi-radio coexistence is provided. The apparatus is configured to support coexistence between multiple transceiver circuits configured to communicate radio frequency (RF) signals in a shared RF medium. In examples discussed herein, one transceiver circuit asserts a medium access request via a standard-defined coexistence interface for communicating an RF signal in the shared RF medium. The transceiver circuit may be configured to assert or de-assert the medium access request in response to a variety of trigger events. Depending on whether the medium access request is granted, the transceiver circuit may start communicating the RF signal in the shared RF medium in different modes. As such, it may be possible to reduce medium access delay for the transceiver circuit requesting to access the shared RF medium, while protecting the transceiver circuit currently occupying the shared RF medium from undue interruption and interference.