Wireless Device Trigger Frame Resource Unit Allocation
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Solution Overview
Problem
In wireless communication systems, especially in uplink OFDMA (Orthogonal Frequency Division Multiple Access) transmissions, there is a challenge in efficiently utilizing communication resources when terminals are in sleep mode or have no pending transmission demand, leading to resource unit overlap and successful reception failures at the base station due to random backoff procedures.
Innovation Solution
A wireless communication method where a trigger frame is transmitted by the base station to designate resource units for terminals, either by individual terminal identifiers or group identifiers, allowing terminals to randomly select resource units, thereby reducing resource unit overlap and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals randomly select resource units using backoff procedure, then terminals can autonomously acquire resources without complex scheduling, but resource unit overlap occurs frequently leading to reception failures
Solution Approach 1:
The patent changes the parameter of resource unit selection from completely random backoff to a controlled random selection within designated resource units. Terminals first receive trigger frames that specify which resource units are available for selection, then perform random backoff only within that subset rather than across all possible resource units. This parameter change maintains autonomous acquisition while significantly reducing overlap probability.
2Productivity
If trigger frame designates terminals on per-resource-unit basis, then resource allocation is precise and efficient, but complexity of scheduling increases and efficiency degrades when terminals are in sleep mode or have no transmission demand
Solution Approach 1:
The patent segments the resource allocation process into two independent parts: (1) the base station designates specific resource units for uplink transmission in the trigger frame, and (2) terminals autonomously select from those designated units using random backoff. This segmentation allows the base station to control resource unit selection without needing to schedule individual terminals, reducing scheduling complexity while maintaining resource allocation efficiency.
3Device complexity
If trigger frame only designates resource units without terminal designation, then scheduling complexity is reduced, but likelihood of multiple terminals selecting same resource unit increases
Solution Approach 1:
The patent applies preliminary action by having the base station pre-designate specific resource units in the trigger frame before terminals perform random backoff. This preliminary designation of available resource units creates a controlled pool from which terminals select, reducing the probability of collisions compared to completely random selection across all resource units, while still maintaining low scheduling complexity.
Data Source
AI summary
According to one embodiment, a wireless device includes a transmitter; and a receiver. The transmitter is configured to transmit a first frame including information that designates a plurality of frequency components and instructing execution of frequency multiplexing transmission by a plurality of wireless communication terminals; and the receiver is configured to receive the second frame by at least one frequency component of the plurality of frequency components. The first frame has either a first form or a second form, the first form designates individual terminal identifiers of the plurality of wireless communication terminals, the terminal identifiers each being associated with at least one of the plurality of frequency components, and the second form designates a group identifier of a group to which the plurality of wireless communication terminals belong.