Coordinated Medium Access via Reservation Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently coordinating access to a wireless medium, particularly in managing contention-based access and ensuring fair resource allocation among multiple access points.
Innovation Solution
The proposed method involves defining a coordinated medium interval with a common reservation window and a scheduled medium access window, where access points can transmit reservation signals to reserve specific service periods, using either pre-deterministic or contention-based access modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contention-based access is used in wireless communication systems, then access control is simplified, but medium utilization and fairness among multiple access points deteriorate
Solution Approach 1:
The time interval is segmented into a coordinated reservation period for exchanging reservation signals and discrete service periods for actual data transmissions. This segmentation allows access points to reserve specific service periods in advance, improving medium utilization while maintaining coordinated access control
Solution Approach 2:
Access points transmit reservation signals during the coordinated reservation period to reserve service periods before actual data transmissions occur. This preliminary reservation action enables fairer resource allocation and improved medium utilization by planning ahead rather than reacting to contention
2Reliability
If traditional reservation mechanisms are used, then access control is maintained, but signaling overhead increases
Solution Approach 1:
The patent combines the reservation function with existing management frame structures (such as beacons or control frames), merging the reservation signal transmission with regular network management communications. This reduces additional signaling overhead while maintaining reliable access control
Solution Approach 2:
The reservation signal mechanism is designed to work within the existing frame structures and protocols of the wireless network, making the reservation function universal and integrated rather than adding separate dedicated signaling channels, thereby reducing overhead
3Productivity
If coordinated access with service period reservation is implemented, then medium utilization improves, but system complexity increases
Solution Approach 1:
Access points autonomously transmit reservation signals and manage their own service period reservations without requiring centralized control or complex coordination protocols. Each access point independently reserves service periods based on its needs, simplifying the overall system architecture while improving medium utilization
Data Source
AI summary
This disclosure provides systems, methods, apparatus, including computer programs encoded on computer storage media for one or more wireless devices to gain access to a wireless channel of a radio frequency spectrum band. In some aspects, a recurring coordinated medium interval is defined in the time domain and associated with the wireless channel. The coordinated medium interval includes a first time period, which may be referred to as a common reservation window, and a second time period, which may be referred to as a scheduled medium access window. During the first time period, access points (APs) attempting to gain access to the wireless channel may transmit reservation signals to reserve one or more scheduled service periods within the second time period of the same coordinated medium interval. The scheduled service periods reserved by an individual AP may be used for UL/DL communications between that AP and its associated stations (STAs).