Cross-Subframe Split Grant for Uplink Centric Subframes
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, face challenges with timeline issues and overhead in uplink centric subframes due to the need for timely processing of grants, which can lead to inefficiencies and increased latency.
Innovation Solution
The implementation of a cross-subframe split grant approach, where a first grant provides initial resource allocation information and a second grant conveys dynamic modulation and coding details, allowing for more efficient and flexible resource allocation without adding additional overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single grant is transmitted in the first subframe for both current and future subframe resource allocation, then overhead is reduced, but processing time and timing constraints are insufficient
Solution Approach 1:
The patent segments the grant information into two separate grants: a first grant transmitted in the first subframe for current subframe resource allocation, and a second grant transmitted in a later subframe for future subframe resource allocation. This segmentation allows sufficient processing time between grants while maintaining efficient overhead management through consolidated transmission.
2Loss of time
If grant processing is done in the same subframe, then latency is reduced, but processing complexity and timing constraints increase
Solution Approach 1:
The patent employs preliminary action by transmitting the first grant in advance in the first subframe, allowing the user equipment to prepare resource allocation before the actual transmission occurs. This preliminary resource allocation simplifies subsequent processing while maintaining low latency through advance preparation.
3Loss of time
If multiple grants are transmitted separately in different subframes, then processing time is increased, but overhead and timing constraints are reduced
Solution Approach 1:
The patent merges the transmission of multiple grants by consolidating them into a single first subframe when possible, or by efficiently scheduling them across subframes with proper resource allocation. This merging approach reduces overall overhead while managing processing time through coordinated transmission timing.
Data Source
AI summary
Certain aspects of the present disclosure relate to methods and apparatus for grant processing in uplink centric subframes. An example method generally includes transmitting a first subframe comprising a first grant that includes information for one or more transmissions on that allocated resources in the first subframe to a user equipment (UE) and transmitting the first subframe, with a second grant that allocates resources in at least a second subframe to occur after the first subframe. Other aspects, embodiments, and features are also claimed and described.