Short-Format BSR Logic Channel Group Selection
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Solution Overview
Problem
In the LTE wireless communication system, existing technologies fail to accurately determine which logic channel group corresponds to information carried by a short-format Buffer Status Reporting (BSR) control element, especially when the MAC PDU has insufficient space for a long-format BSR control element.
Innovation Solution
A method and apparatus that form a MAC PDU with a padding field smaller than a predefined value, select a logic channel group based on priorities and data amounts, and carry the data amount of the selected uplink buffer with a short-format BSR control element, ensuring accurate buffer status reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a long-format BSR control element is used to report data amount of all logic channel groups, then the network can recognize complete buffer status information, but the MAC PDU length becomes insufficient and cannot be carried in padding field
Solution Approach 1:
The patent extracts only the most critical buffer status information (highest priority logic channel group with non-zero data) from the complete set of all logic channel groups, reporting only this subset in the short-format BSR control element. This extraction approach allows the BSR information to be carried in the limited padding field while still providing the network with the most important buffer status data needed for uplink resource allocation.
2Length of moving object
If a short-format BSR control element is used to fit in limited MAC PDU space, then the MAC PDU can be successfully transmitted, but the network cannot determine which logic channel group the reported data amount corresponds to
Solution Approach 1:
The patent applies local quality by making the short-format BSR control element carry not just data amount information but also the identity of the specific logic channel group (through the 2-bit logic channel group indicator). This localized enhancement of information content in the constrained short format allows the network to identify which logic channel group the buffer status report refers to, resolving the information loss problem.
3Productivity
If short-format BSR control element is used with insufficient padding field, then transmission is possible, but accurate identification of corresponding logic channel group is lost
Solution Approach 1:
The patent performs preliminary action by having the UE select and identify the target logic channel group (the one with highest priority and non-zero data amount) before constructing the short-format BSR control element. This pre-identification ensures that the 2-bit logic channel group indicator in the BSR control element accurately points to the correct logic channel group, maintaining measurement precision even in the constrained short format.
Data Source
AI summary
A method for performing buffer status reporting (BSR) in a user equipment of a wireless communication system comprises forming a MAC PDU comprising a padding field with a size smaller than a first predefined value, selecting a first logic channel group from a plurality of logic channel groups of the user equipment according to priorities and data amounts of uplink buffers of the plurality of logic channel groups, carrying information about a data amount of an uplink buffer of the first logic channel group with a short-format BSR control element, and carrying the short-format BSR control element with the padding field of the MAC PDU for a network of the wireless communication system.