Uplink Resource Allocation via Adaptive MAC Signaling
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Solution Overview
Problem
Current uplink resource allocation methods in wireless communication systems experience delays due to inefficient resource request processes, especially when multiple UEs use the same ranging code, leading to collisions and inadequate resource allocation, and lack effective error detection for additional information, resulting in suboptimal channel capacity utilization, particularly with multiple antennas.
Innovation Solution
A method that generates a first message with a preamble and adaptive resource request information based on communication state, including a MAC address and error check code, allowing for efficient resource allocation by considering channel quality, position, and transmission failure, and using multi-user detection with multiple antennas to manage resource allocation and reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple UEs use the same ranging code for resource request, then the resource request process is simplified, but collisions occur leading to transmission delays
Solution Approach 1:
The patent segments the ranging code resource by introducing different types of additional information (buffer status, power headroom, channel quality) that UEs can include in their random access messages. This segmentation allows the base station to differentiate between multiple UEs using the same ranging code based on the content of their additional information, thereby resolving collisions without requiring unique ranging codes for each UE.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station detects additional information from multiple UEs and generates separate resource allocation messages for each UE. This intermediary processing at the base station level resolves the collision problem by mediating between the conflicting UEs and allocating resources individually, thus eliminating transmission delays caused by collisions.
2Measurement precision
If additional information is included in the random access message, then resource allocation accuracy is improved, but error detection capability is reduced
Solution Approach 1:
The patent applies preliminary action by having UEs include error detection codes (such as CRC) in the additional information field before transmission. This preliminary error detection mechanism allows the base station to verify the integrity of additional information before processing resource allocation, thus maintaining both high resource allocation accuracy and reliable error detection capability.
Solution Approach 2:
The patent implements feedback through the error detection mechanism where the base station checks the additional information for errors and can request retransmission if errors are detected. This feedback loop ensures that resource allocation decisions are based on accurate information while maintaining the ability to detect and correct transmission errors, thus resolving the contradiction between accuracy and reliability.
3Quantity of substance
If multiple antennas are used for transmission, then channel capacity is increased, but collision resolution capability is reduced
Solution Approach 1:
The patent segments the collision resolution function from the multiple antenna transmission function. While multiple antennas handle channel capacity enhancement through spatial multiplexing, the collision resolution is handled by segmenting and analyzing the additional information content from each UE. This segmentation allows independent processing of collision resolution without compromising the channel capacity benefits of multiple antennas.
Solution Approach 2:
The patent introduces an intermediary information processing layer that operates between the multiple antenna reception and the resource allocation decision. The base station uses the additional information from UEs as an intermediary to resolve collisions, while the multiple antennas simultaneously provide enhanced channel capacity. This intermediary mechanism allows both functions to operate independently and simultaneously, resolving the apparent contradiction.
Data Source
AI summary
A method of allocating uplink resources in a wireless communication system is provided. The method comprises generating a first message which has a preamble and adaptively further includes resource request information based on a communication state with a base station and transmitting the first message to the base station.