Persistent Allocation IE for Wireless Resource Overhead Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in 4G networks like IEEE 802.16, there is a need to reduce overhead and minimize the size of Resource Allocation Information Elements (IEs) for persistent resource allocation, especially in services with periodic traffic patterns like VoIP, to minimize unnecessary resource allocation messages.
Innovation Solution
A method and apparatus that generate and transmit a persistent allocation IE including an allocation period and resource allocation information, using the allocation period and maximum retransmission delay to calculate the number of Automatic Repeat Request Channel Identifiers (ACIDs) for Hybrid Automatic Repeat Request (HARQ) operations, thereby optimizing resource allocation and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource allocation IE is transmitted for every packet in periodic services like VoIP, then resource allocation can be performed accurately, but overhead increases unnecessarily
Solution Approach 1:
The patent applies preliminary action by performing resource allocation in advance for periodic services. The base station determines and allocates resources for multiple future packets before they are actually transmitted. This allows the system to maintain accurate resource allocation while avoiding the need to send resource allocation IEs for every single packet, thereby reducing overhead significantly for periodic traffic patterns like VoIP.
2Loss of substance
If persistent allocation is used to reduce overhead, then fewer resource allocation IEs are transmitted, but the system becomes less adaptable to resource changes
Solution Approach 1:
The patent implements dynamics by making the resource allocation system adaptive rather than static. While persistent allocation is used to reduce overhead, the system dynamically monitors traffic conditions and can transition between persistent and non-persistent allocation modes. The base station can send resource allocation IEs periodically or on-demand to update persistent allocations when changes are needed, creating a dynamic balance between overhead reduction and adaptability.
Solution Approach 2:
The patent applies parameter changes by modifying the allocation period and resource allocation parameters based on traffic conditions. The system can adjust the persistence duration, allocation period, and resource parameters dynamically. When traffic patterns change or QoS requirements are not met, the system changes the allocation parameters to maintain optimal performance while still benefiting from reduced overhead compared to traditional per-packet allocation.
3Loss of substance
If resource allocation IE size is minimized for persistent allocation, then overhead is reduced, but information completeness may be compromised
Solution Approach 1:
The patent extracts only the essential information needed for persistent resource allocation. Instead of including complete resource allocation details in every IE, the system extracts and transmits only the critical parameters such as allocation period, persistent resource identifiers, and key QoS parameters. The mobile station uses this extracted information combined with previously received allocation data to reconstruct the complete resource allocation picture, thereby minimizing IE size while maintaining information completeness.
Solution Approach 2:
The patent applies the nested doll principle by organizing allocation information at multiple levels. The persistent allocation IE contains condensed information that references or nests within the broader context of previously received resource allocation data. The mobile station maintains a context buffer that stores complete allocation information, allowing it to interpret minimal persistent allocation IEs in the context of previously received detailed allocation data, thus preserving information completeness while reducing current message size.
Data Source
AI summary
A method and an apparatus are disclosed whereby a base station generates a resource allocation Information Element (IE) including an allocation period for persistent allocation and resource allocation information indicating a persistent resource, loads the IE on a map message, and then transmits the map message to a mobile station. The number of Automatic Repeat reQuest Channel Identifiers (ACIDs indicating the number of HARQ channels used for an HARQ operation is calculated based on the maximum retransmission delay for the HARQ operation and the allocation period acquired from the resource allocation IE. Therefore, the present invention minimizes the map overhead for resource allocation according to the persistent allocation scheme.