Base Station Scheduler Mode for LTE Control Channel Interference
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Solution Overview
Problem
The existing LTE wireless access system experiences degradation in reception quality of the control channel due to interference from macro or local base stations, and there is a significant battery consumption issue in terminals due to frequent operations for PDCCH and PUSCH communications.
Innovation Solution
A base station apparatus employing a dynamic scheduler mode or a continuous transmission scheduler mode to allocate wireless resources, where the scheduler mode is determined based on the presence of interference-receiving terminals, reducing unnecessary PDCCH and PCFICH receptions and optimizing resource allocation for improved reception quality and battery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic scheduling is performed for each subframe to improve resource allocation flexibility, then productivity is improved, but use of energy by moving object increases due to frequent PDCCH and PCFICH receptions
Solution Approach 1:
The patent applies periodic action by introducing continuous transmission scheduling that performs resource allocation periodically at specific subframes rather than every subframe. The terminal receives allocation information at predetermined intervals and reuses it for multiple subframes, reducing the frequency of PDCCH and PCFICH receptions while maintaining efficient resource utilization during continuous data transmission periods.
2Adaptability or versatility
If area extension is performed from macro base station and local base station to improve coverage, then adaptability is improved, but reception quality of control channel deteriorates due to interference
Solution Approach 1:
The patent reduces interference by transmitting control channels periodically rather than continuously. The continuous transmission scheduler mode allocates resources at specific periodic intervals, leaving other subframes without control channel transmissions from the interfering base station, thereby reducing the cumulative interference impact on control channel reception quality.
Solution Approach 2:
The patent applies preliminary action by having the terminal receive and store allocation information in advance at predetermined subframes. The terminal prepares reception buffers and configures its receiver before data transmission begins, allowing it to efficiently process continuous data flows without requiring frequent control channel updates, thus reducing interference exposure.
Data Source
AI summary
Provided is a base station apparatus that employs a dynamic scheduler mode which performs wireless resource allocation for each subframe and applies a result of the allocation to the corresponding subframe, or a continuous transmission scheduler mode which performs wireless resource allocation for each subframe appearing periodically based on a period P and applies a result of the allocation for the relevant subframe to P continuous subframes from a subframe n to a subframe n+P−1. The base station apparatus includes a terminal communication device that communicates continuous transmission application ON/OFF information, which indicates whether or not the continuous transmission scheduler mode is employed, and continuous transmission period information, which indicates a period of continuous transmission scheduling according to the continuous transmission scheduler mode, to a terminal. The terminal communication device may store the continuous transmission application ON/OFF information and the continuous transmission period information in a PDCCH region.