Absolute Grant Mapping Table Configuration for HSPA+ Power Control
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Solution Overview
Problem
The introduction of 16QAM in high-speed uplink packet access systems leads to inconsistencies in power resource allocation between base stations and user equipment due to the lack of explicit specification for absolute grant mapping relationship tables, resulting in system overload or reduced throughput.
Innovation Solution
A method where a radio network controller notifies a base station of the absolute grant mapping relationship table for E-AGCH through signaling, ensuring consistency with the table used by user equipment via the air interface, using identification numbers and specific messages like radio link setup or reconfiguration requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station and user equipment use different absolute grant mapping relationship tables, then the system can operate with existing protocols, but power resource allocation becomes inconsistent leading to system overload or reduced throughput
Solution Approach 1:
The radio network controller sends signaling to the base station to configure the absolute grant mapping relationship table, creating a feedback loop that ensures both the base station and user equipment use the same table. This feedback mechanism aligns the power resource allocation between network side and terminal side, preventing inconsistency while maintaining system throughput.
Solution Approach 2:
The radio network controller acts as an intermediary between the network configuration and the base station, transmitting the absolute grant mapping relationship table through standardized signaling interfaces. This intermediary ensures that the correct mapping table is propagated to both the base station and user equipment, maintaining consistency without requiring direct communication between them.
2Productivity
If 16QAM high order modulation is introduced to increase data transmission rate, then user throughput is improved, but higher power is required which complicates uplink power control and grant determination
Solution Approach 1:
The introduction of 16QAM changes the modulation parameter from QPSK to a higher order modulation, which increases the data transmission rate. However, this parameter change requires corresponding adjustments in the absolute grant mapping relationship table to accommodate the higher power requirements, thereby managing the complexity of power control through structured parameter adaptation.
3Device complexity
If the absolute grant mapping relationship table is not explicitly specified at the NBAP interface, then the system maintains protocol simplicity, but the base station and user equipment obtain different absolute grant values resulting in resource allocation inconsistency
Solution Approach 1:
The radio network controller performs preliminary configuration by sending the absolute grant mapping relationship table to the base station through signaling before actual data transmission begins. This preliminary action ensures that both the base station and user equipment are pre-aligned with the same mapping table, preventing inconsistency without requiring complex ongoing negotiations or specifications at the NBAP interface.
Data Source
AI summary
A method for configuring an absolute grant mapping relationship table for a base station, comprises: a radio network controller notifying the base station of the absolute grant mapping relationship table used by an enhanced dedicated channel absolute grant channel (E-AGCH) through a signaling, and the base station returning a response message to the radio network controller after storing the configured information. The present invention allows the absolute grant mapping relationship table used by the base station to be consistent with an absolute grant mapping relationship table of which a user equipment is notified via the air interface to use, so as to ensure that the absolute grant values corresponding to the base station and the user equipment are obtained from the same absolute grant mapping relationship table, i.e., the same absolute grant value and index relationship table, such that allocation and use of the power resource by the base station and the user equipment are consistent, thereby ensuring efficient utilization of resources and security of the system.