Listen After Talk Control Fields for Multiuser Wireless Transmission
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Solution Overview
Problem
Existing Listen-After-Talk (LAT) schemes in wireless communication networks are inadequate for addressing issues related to multicast and multiuser transmissions, particularly in high-gain beamforming scenarios where directional transmissions are prone to hidden, exposed, and deafness problems, leading to interference and reduced spectral coexistence efficiency.
Innovation Solution
The proposed solution involves modifying the LAT mechanism by including multiple control fields in the header of data packets to enable multiuser/multicast transmissions, allowing only interfering users/beam to be inactivated, and using orthogonal or non-orthogonal resource allocation for efficient coordination signaling, thereby extending the flexibility and spectral efficiency of data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen-Before-Talk (LBT) mechanism is used for directional transmissions, then spectral coexistence is achieved, but hidden terminal, exposed terminal, and deafness problems occur leading to reduced reliability
Solution Approach 1:
The patent introduces a frame structure with control fields as an intermediary mechanism between transmitters and receivers. The control fields carry information about resource allocation and transmission parameters, enabling coordinated multiuser transmissions while avoiding the hidden terminal problem by providing centralized control information rather than relying on distributed LBT listening.
2Adaptability or versatility
If LBT mechanism is used for wide beam width transmissions, then spectral coexistence is provided, but it is not reliable for highly directional transmissions
Solution Approach 1:
The patent employs dynamic resource allocation through control fields that can adapt to different beam widths and transmission scenarios. The frame structure allows flexible configuration of resource units and control information based on whether wide or narrow beams are used, enabling the system to dynamically adjust to directional transmission requirements while maintaining reliability.
3Productivity
If existing LAT schemes are used for multicast/mult user transmissions, then data transmission is enabled, but interference coordination is inadequate
Solution Approach 1:
The patent segments the transmission resource into multiple resource units, each associated with specific users or beams. The control fields provide segmented information about resource allocation for different users, enabling fine-grained interference coordination in multiuser/multicast scenarios while maintaining high data transmission efficiency through parallel resource utilization.
Data Source
AI summary
A method to operate an access node of a wireless communication network is provided. A first frame may be provided including a first header and a first data block with first data for a first wireless terminal and a second wireless terminal. The header may include a first control field indicating a first idle period resource and a second control field indicating a second idle period resource, and the first and second idle period resources may be different. Transmission of the first frame to the first and second wireless terminals may be initiated. Responsive to receiving a notification message using the first idle period resource, a second frame may be provided including a second header and a second data block with second data for the second wireless terminal. Transmission of the second frame to the second wireless terminal may be initiated while deferring transmission to the first wireless terminal.