Persistent Subframe Scheduling Overhead Reduction
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Solution Overview
Problem
Current wireless networks face inefficiencies in scheduling transmissions between base stations and multiple user stations, particularly in maximizing bandwidth and reducing overhead in OFDMA protocols, which affects the delivery of high-speed data services.
Innovation Solution
The optimization techniques eliminate repetitive information fields in scheduling/mapping, allow the use of the same HARQ region for both persistent and non-persistent allocations, and reduce MAP overhead by using flags to specify only necessary information, enabling efficient usage of allocation holes and minimizing retransmission overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional scheduling methods are used in OFDMA networks, then complete information fields are transmitted for each allocation, but MAP overhead increases significantly
Solution Approach 1:
The patent extracts only the essential information fields needed for persistent allocations from the complete scheduling information. By identifying and removing redundant fields that are not necessary for persistent allocation scenarios, the MAP overhead is significantly reduced while maintaining the reliability of scheduling information for the specific use case.
Solution Approach 2:
The patent applies different information field structures to different allocation types. Instead of using a uniform complete information field for all allocations, it tailors the information fields locally to match the specific requirements of persistent versus non-persistent allocations, thereby reducing overhead for persistent allocations while maintaining completeness for non-persistent allocations.
2Ease of manufacture
If separate HARQ regions are used for persistent and non-persistent allocations, then resource organization is simplified, but resource utilization efficiency decreases
Solution Approach 1:
The patent merges the previously separate HARQ regions for persistent and non-persistent allocations into a single unified HARQ region. This consolidation eliminates the need for separate resource pools and simplifies the overall resource organization, while simultaneously improving resource utilization efficiency by allowing flexible allocation of resources within the unified region based on actual network conditions.
Solution Approach 2:
The unified HARQ region is designed to serve multiple functions - handling both persistent and non-persistent allocations within the same region. This multi-functional approach allows the system to maintain simple resource organization while achieving high resource utilization efficiency, as the same HARQ region can be dynamically allocated to different types of traffic based on demand.
3Measurement precision
If all information fields are specified for each allocation, then scheduling accuracy is maintained, but processing overhead increases
Solution Approach 1:
The patent applies partial action by specifying only the necessary information fields for each allocation type rather than all possible fields. For persistent allocations, only the essential fields are included in the MAP message, reducing processing overhead while maintaining sufficient scheduling accuracy for the specific allocation type.
Solution Approach 2:
The patent changes the parameters of information field specification based on the allocation type. By dynamically adjusting which fields are included in the scheduling information based on whether the allocation is persistent or non-persistent, the system maintains scheduling accuracy where needed while minimizing processing overhead where full precision is not required.
Data Source
AI summary
The various inventive embodiments relate to arrangement of information elements (IEs) for persistent and/or dynamic allocations in a wireless broadband network and include optimization techniques to eliminate the repetitive information fields from the downlink (DL)-Persistent-IEs, uplink (UL)-Persistent-IEs, DL-IEs, and UL-IEs. Elimination of repetitive information fields reduces MAP overhead. In addition embodiments relate to methods to use the same hybrid automatic repeat request (HARQ) region to contain persistent as well as non-persistent allocations. The use of the same HARQ region for persistent as well as non-persistent allocations further reduces the MAP overhead as it requires a single header to define the HARQ region instead of the two headers that are required to define two different HARQ regions: one for persistent allocation and the second one for non-persistent allocations.