Uplink Grant Validation for Wireless Communication
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Solution Overview
Problem
In a single serving cell, normal communication cannot be performed unless appropriate control is exercised to prevent simultaneous transmissions in the same radio resource slot for multiple configured uplink grants.
Innovation Solution
A mobile station apparatus and base station apparatus configuration that individually configures and validates uplink grants for normal and supplementary uplinks, allowing one to be active while suspending the other, and includes control information to specify a default uplink for communication, enabling seamless switching between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple configured uplink grants are configured in a single serving cell, then communication flexibility and coverage are improved, but transmission conflicts occur in the same radio resource slot
Solution Approach 1:
The patent implements dynamic validation and suspension of configured uplink grants based on timing conditions. The mobile station apparatus validates one configured uplink grant and suspends another when their transmission timings overlap, allowing flexible switching between normal uplink and supplementary uplink while preventing transmission conflicts. This dynamic state change resolves the contradiction by adapting grant validity based on real-time resource availability.
2Area of stationary object
If normal uplink and supplementary uplink are both configured, then coverage area is improved, but transmission timing conflicts occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple uplink grants with different timing characteristics before transmission occurs. The mobile station apparatus is pre-configured with both normal uplink and supplementary uplink grants, each with predetermined validation and suspension conditions. When a grant is to be suspended, the apparatus performs preliminary validation checks to ensure no transmission conflicts occur, thereby managing complexity through structured advance planning.
3Reliability
If configured uplink grant validation is implemented, then transmission conflicts are prevented, but communication protocol complexity increases
Solution Approach 1:
The patent applies local quality by implementing validation and suspension mechanisms specifically for configured uplink grants rather than all uplink transmissions. The validation logic is localized to the MAC layer configuration management, where each configured uplink grant is individually tracked with its own validation state. This targeted approach prevents transmission conflicts while minimizing protocol complexity by applying control only where needed.
Data Source
AI summary
In a case that multiple configured uplink grants are configured in a single serving cell, there is a problem that normal communication cannot be performed unless appropriate control is performed to prevent transmissions in a radio resource (slot) of the same timing. A mobile station apparatus in a communication system including at least a base station apparatus and the mobile station apparatus for which the base station apparatus allocates a normal uplink and a supplementary uplink in a single serving cell, wherein the mobile communication apparatus is configured to configure a configured uplink grant individually for each of the normal uplink and the supplementary uplink, and validate, in a case that the serving cell is activated, one of the configured uplink grant configured for the normal uplink and the configured uplink grant configured for the supplementary uplink and suspend another one.