Dynamic Forward Link Resource Allocation for Chatty HRPD Traffic
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Solution Overview
Problem
High Rate Packet Data (HRPD) systems face performance degradation due to 'chatty' applications that generate short data bursts with long inter-burst intervals, leading to increased access channel loading, RF interference, and low connection utilization, as they were designed for a small number of active users with heavy data volumes.
Innovation Solution
Implementing flexible, short packet transmissions over shared forward and reverse link data channels without constant fixed overhead, using time division multiple access and HARQ processes, and allocating resources dynamically based on data alert messages to optimize resource usage and reduce connection setup delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HRPD systems allocate overhead/feedback channels and maintain RF connections for each user, then connection reliability is improved, but RF resource usage increases and connection utilization decreases for chatty applications
Solution Approach 1:
The patent implements dynamic connection management where the network can transition users between active RF connections and idle states. For chatty applications with long inter-burst intervals, connections are released after data transmission and re-established when new data arrives, making the connection state dynamic rather than static to match the intermittent traffic pattern
Solution Approach 2:
The patent allows discarding of RF connections for users with no immediate data transmission needs, particularly for chatty applications. The connection resources are recovered and made available for other users, then re-allocated when new data traffic is detected through data alert messages or access channel activity
2Adaptability or versatility
If HRPD systems maintain RF connections for multiple users, then connection availability is improved, but access channel loading increases and RF interference increases
Solution Approach 1:
The patent employs periodic monitoring of access channels for data alert messages rather than maintaining continuous RF connections. The system periodically checks for incoming data requests and establishes connections only when needed, creating a periodic action pattern that reduces continuous RF interference while maintaining connection availability when data traffic occurs
Solution Approach 2:
The patent uses preliminary detection of data traffic needs through access channel monitoring and data alert messages before establishing full RF connections. This preliminary action allows the system to prepare for connection establishment only when actual data transmission is required, avoiding unnecessary connections and associated RF interference
3Productivity
If HRPD systems establish connections for each user, then data transmission capability is improved, but connection setup delay increases and productivity decreases for short data bursts
Solution Approach 1:
The patent implements preliminary resource allocation through data alert messages that notify the network of incoming data before full connection establishment. This preliminary action allows the network to prepare transmission resources in advance, reducing the actual connection setup delay when data transmission begins, particularly beneficial for short data bursts in chatty applications
Solution Approach 2:
The patent enables rapid connection establishment by skipping extensive connection setup procedures when data alert messages are already present. The system can rush through the essential connection parameters and begin data transmission quickly, reducing setup delay for time-sensitive short data bursts while maintaining data transmission capability
4Reliability
If HRPD systems use dedicated channels for each user, then data transmission reliability is improved, but resource allocation efficiency worsens for intermittent traffic patterns
Solution Approach 1:
The patent implements universal resource allocation where the same RF resources and channels are shared among multiple users based on actual data transmission needs. Instead of dedicating resources to each user, the system allocates resources universally to any user who has data to transmit, improving resource allocation efficiency while maintaining transmission reliability through on-demand connection establishment
Solution Approach 2:
The patent creates dynamic resource allocation that adapts to intermittent traffic patterns by establishing dedicated channels only when data is present and releasing them when idle. This dynamic approach allows the system to provide dedicated channel reliability when needed while achieving shared resource efficiency during idle periods, matching resource allocation to actual traffic demands
Data Source
AI summary
In one embodiment the method includes allocating, for a mobile, forward link resources for transmitting data over a shared forward link data channel without allocating reverse link resources for reverse link data transmission in association with the allocated forward link resources. At least a portion of the received data is repeatedly sent to the mobile on the shared forward link data channel over a time division multiple access air interface using the allocated forward link resources until an acknowledgement is received from the mobile or a number of transmissions have taken place.