Random Access Resource Allocation via Region-Specific ACK Masking
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Solution Overview
Problem
In broadband wireless access systems, mobile stations face inefficiencies in determining the success of random access attempts due to the need for unnecessary decoding of ACK information across various regions, leading to resource allocation challenges.
Innovation Solution
Assigning separate identifiers for random access regions within subframes or frames allows mobile stations to decode only relevant ACK information, masking it with identifiers specific to bandwidth request or ranging regions, thereby reducing unnecessary decoding and improving resource allocation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile stations decode ACK information across all regions to determine random access success, then they can ensure reliable reception of ACK information, but they incur unnecessary decoding overhead and reduced processing efficiency
Solution Approach 1:
The patent segments the acknowledgment information by assigning different identifiers to different random access regions (bandwidth request region vs. ranging region). Mobile stations only need to decode ACK information corresponding to their specific region identifier, rather than decoding all ACK information. This segmentation reduces unnecessary decoding operations while ensuring reliable reception of the relevant ACK information.
2Productivity
If separate identifiers are assigned to different random access regions, then mobile stations can reduce unnecessary decoding operations, but the system complexity increases due to identifier management
Solution Approach 1:
The patent extracts the region identification function from the ACK information content itself by using separate identifiers. The identifiers are carried in distinct fields (e.g., different A-MAP IE structures or dedicated identifier fields), allowing mobile stations to quickly match their transmitted preamble's region with the corresponding identifier in the ACK information. This extraction simplifies the decoding process while the identifier management complexity is handled by the base station's scheduling and message construction functions.
3Ease of operation
If mobile stations transmit preamble sequences in random access regions, then they can initiate resource allocation requests, but determining the success of these requests becomes inefficient without region-specific ACK identification
Solution Approach 1:
The patent applies preliminary action by having mobile stations include region-specific identifiers with their preamble sequences or associated messages. The base station then uses these identifiers to tag the corresponding ACK information. When mobile stations receive ACK information, they can immediately match the identifier to determine if the ACK corresponds to their specific random access attempt, eliminating the need to decode all ACK information and significantly reducing the time to determine access success.
Data Source
AI summary
The present invention relates to a broadband wireless access system, and more specifically, to a method and apparatus for efficiently allocating resources to terminals in a random access system. The method for performing such a random access procedure of a terminal in a broadband wireless system according to one embodiment of the present invention comprises: transmitting a preamble sequence to a random access region in a base station; and receiving from the base station ACK information indicative of a received state of the preamble sequence. The ACK information receiving step is preferably a step of decoding a map information element that is masked as an identifier of the random access region.