Access Terminal Reverse Link Transmission Timing
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Solution Overview
Problem
The existing reverse link transmission protocol in CDMA2000 HRPD access terminals imposes significant processing demands due to tight timing constraints for processing ACK/NAK data, requiring faster and more expensive processors.
Innovation Solution
The method involves processing ARQ bits from a Media Access Control (MAC) bit processing unit, calculating the maximum allowed reverse rate and grant size, distributing grants to applications, and using a stored read pointer in an application transmit queue to relax timing constraints, allowing for more efficient data preparation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the access terminal processes ACK/NAK data immediately in the tight timing window, then the reverse link transmission can proceed without delay, but the processing demands require faster and more expensive processors
Solution Approach 1:
The patent applies preliminary action by preparing data for transmission in advance during a timing window before the actual transmission slot. The access terminal processes ARQ bits, calculates grant sizes, and prepares sub-packets ahead of time, so that when the transmission slot arrives, the data is ready for immediate transmission without requiring ultra-fast processors during the critical transmission moment.
2Device complexity
If the access terminal uses a larger timing window for processing ACK/NAK data, then the processing demands are reduced and cheaper processors can be used, but the transmission timing flexibility is reduced
Solution Approach 1:
The patent implements dynamics by making the timing window adjustable rather than fixed. The access terminal can dynamically configure the size of the timing window based on current network conditions, traffic load, and processor capabilities. This allows the system to adapt between having larger processing time (lower processor requirements) and tighter timing constraints (higher transmission efficiency) as needed.
3Loss of time
If the access terminal processes all ARQ bits and prepares data immediately, then transmission can proceed without waiting, but the processing time required increases the overall transmission cycle time
Solution Approach 1:
The patent applies segmentation by dividing the data preparation process into distinct phases: ARQ bit processing, grant calculation, data selection, and final packet assembly. Each phase can be executed in parallel or in sequence depending on resource availability, allowing the system to optimize the overall cycle time by processing different aspects of data preparation simultaneously rather than sequentially.
Data Source
AI summary
A method for providing improved reverse link transmission timing in an access terminal is provided. The method includes processing automatic repeat request (ARQ) bits from a MAC bit processing unit for a previous sub-frame. The ARQ bits comprise a hybrid ARQ (H-ARQ) bit, a last ARQ (L-ARQ) bit, and a packet ARQ (P-ARQ) bit. The method also includes calculating the maximum allowed reverse rate and grant size for a MAC flow. The method further includes distributing grants to each application in the MAC flow. The method also includes storing a stored read pointer in an application transmit queue, for each application in the MAC flow. The method also includes preparing data for transmission, in response to storing the stored read pointer for each application in the MAC flow, based on the ARQ bits. The method also includes transmitting the data.