Contiguous Resource Allocation Indication in OFDM Systems
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Solution Overview
Problem
In OFDM-based wireless communication systems, efficiently indicating contiguous resource allocations to mobile stations is challenging due to the complexity of managing non-overlapping sub-carrier sets for simultaneous communications, leading to interference and sub-optimal decoding performance.
Innovation Solution
A resource allocation message with a sub-band index (SBI) field and message fields is used to determine the set of sub-bands for communication, allowing mobile stations to interpret and utilize contiguous or non-contiguous sub-bands based on indicators, improving decoding efficiency and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional resource allocation methods are used to manage non-overlapping sub-carrier sets for simultaneous communications, then interference between transmissions is reduced, but decoding performance becomes sub-optimal and system complexity increases
Solution Approach 1:
The patent segments the resource allocation indication into multiple fields: a first resource allocation field indicating a first set of resource blocks, and a second resource allocation field indicating a second set of resource blocks. This segmentation allows the system to separately indicate different resource allocation patterns (contiguous and non-contiguous) for different transmission directions, thereby reducing interference while maintaining optimal decoding performance through precise resource identification.
2Reliability
If detailed resource allocation information is provided for each sub-carrier set, then decoding performance is improved, but the complexity of managing and processing allocation messages increases
Solution Approach 1:
The patent merges the indication of resource blocks for uplink and downlink transmissions into a unified resource allocation message structure. The first resource allocation field and second resource allocation field work together to indicate both contiguous and non-contiguous resource sets, reducing the overall message complexity while providing sufficient information for optimal decoding performance in both transmission directions.
3Object-affected harmful factors
If separate allocation messages are sent for each transmission direction, then interference management is improved, but communication efficiency and productivity decrease
Solution Approach 1:
The patent creates a universal resource allocation message that serves multiple functions simultaneously. The same message structure with first and second resource allocation fields indicates resource blocks for both uplink and downlink transmissions, enabling improved interference management while maintaining high communication efficiency through a single multi-functional allocation message rather than separate messages for each direction.
Data Source
AI summary
A mobile station and base station are capable of communicating in a wireless network via a set of contiguous or non-contiguous sub-bands. The base station transmits a resource allocation to the mobile station. The resource allocation message includes a sub-band index (SBI) field, a number of messages field, a contiguous allocation indicator field, or a combination of these. Based on the SBI field, one or more of the number of messages field and contiguous allocation indicator field, the mobile station can identify the set of sub-bands allocated to it by the base station.