Wireless Logical Channel Scheduling to Prevent Uplink Blocking
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Solution Overview
Problem
In high speed uplink packet access (HSUPA) wireless communication systems, transmission blocking occurs when the granted power ratio falls below the minimum required for transmitting RLC PDUs, leading to inefficient resource allocation and scheduling delays, particularly for delay-sensitive applications.
Innovation Solution
Implementing methods to transmit scheduling information (SI) under new trigger conditions, such as when transmission of a MAC-d flow is stopped, and using minimum grant information (MGI) to adjust power ratios dynamically, allowing hybrid scheduled/non-scheduled transmissions to prevent blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast control through Node-B based scheduling is implemented in HSUPA, then system capacity and control of uplink noise rise are improved, but transmission blocking occurs when granted power ratio falls below minimum required for RLC PDU transmission
Solution Approach 1:
The patent transmits scheduling information (SI) in advance when specific trigger conditions are met, such as when the granted power ratio approaches the minimum required level or when transmission blocking is detected. This preliminary transmission of SI allows the network to proactively adjust scheduling decisions before actual transmission blocking occurs, ensuring continuous data flow while maintaining fast control capabilities.
2Manufacturing precision
If RLC PDUs are buffered at the RLC layer with segmented data, then coding performance is improved, but transmission blocking occurs when granted power ratio is insufficient to transmit even a single PDU
Solution Approach 1:
The patent implements a feedback mechanism where the WTRU monitors the granted power ratio and compares it against the minimum required power ratio for transmitting the next RLC PDU. When the granted power ratio falls below the threshold or when transmission blocking is detected, the WTRU triggers SI transmission to inform the network. This feedback loop enables dynamic adjustment of scheduling decisions based on real-time power availability, maintaining both coding performance and transmission continuity.
3Reliability
If scheduling information is transmitted frequently to prevent blocking, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent transmits scheduling information selectively based on specific trigger conditions rather than continuously or at every transmission opportunity. The trigger conditions include when the granted power ratio falls below the minimum required level, when transmission blocking is detected, or when other predefined conditions are met. This partial action approach ensures transmission reliability by transmitting SI only when necessary, avoiding excessive signaling overhead while still preventing blocking when it would occur.
Data Source
AI summary
A base station may be configured to send a first downlink control information indicating that a wireless transmit/receive unit (WTRU) is to transmit uplink data on a first uplink channel. The base station may be configured to receive a plurality of a same value over a second uplink channel in response to a triggering condition. The second uplink channel may be a control channel. The base station may be configured to sending a second downlink control information in accordance with the plurality of the same value over the second uplink channel. The plurality of the same value may be in response to the first downlink control information providing an insufficient amount to transmit uplink data over the first uplink channel. The base station may be configured to send an indication of logical channels that are subject to triggering of an uplink scheduling request.