Dynamic Multicarrier Transmission Mode Signaling for HSPA Resource Optimization
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Solution Overview
Problem
Existing multicarrier HSPA systems lack a signaling mechanism to support dynamic activation of various transmission modes, such as mode #3 (repetitive data over multiple carriers), which limits efficient resource utilization and coverage enhancement.
Innovation Solution
A signaling mechanism is introduced to dynamically or semi-dynamically select and activate different multicarrier transmission modes based on criteria such as UE and BS measurements, and UE-reported events, allowing for the use of modes like mode #1 (different data blocks), mode #2 (interleaved data blocks), mode #3 (repetitive data blocks), and mode #4 (repetitive data blocks in different TTIs), optimizing transmission according to service needs and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission modes are supported in multicarrier HSPA systems, then resource utilization efficiency and coverage enhancement are improved, but system complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic transmission mode selection where the system can switch between different transmission modes (single carrier, multi-carrier with different data blocks, multi-carrier with interleaved data blocks, multi-carrier with repetitive data blocks) based on real-time channel conditions, UE capabilities, and service requirements. This dynamic adaptation allows the system to optimize resource utilization while managing complexity through conditional activation rather than permanent configuration of all modes.
Solution Approach 2:
The patent changes system parameters by introducing a mode indication field in downlink control information that can take different values to indicate different transmission modes. This parameter-based control mechanism enables flexible switching between transmission modes without requiring fundamental system architecture changes, thus improving resource utilization while keeping the increase in system complexity manageable through standardized parameter encoding.
2Reliability
If multiple transmission modes are supported in multicarrier HSPA systems, then coverage enhancement and data rate improvement are achieved, but signaling overhead increases
Solution Approach 1:
The patent creates a universal signaling mechanism that handles multiple transmission modes through a single mode indication field in the downlink control information. This multi-functional approach allows the same signaling structure to indicate different transmission modes (single carrier, multi-carrier with different data blocks, multi-carrier with interleaved data blocks, multi-carrier with repetitive data blocks) without requiring separate signaling for each mode, thus reducing overall signaling overhead while maintaining coverage enhancement capabilities.
Solution Approach 2:
The patent implements partial signaling by only indicating the transmission mode when it differs from a default or previously established mode. This selective signaling approach reduces signaling overhead by avoiding redundant mode indications while still providing necessary coverage enhancement when mode switching is required. The system uses the mode indication field selectively based on actual transmission mode changes.
3Reliability
If transmission mode #3 (repetitive data blocks over different carriers) is used, then coverage is improved and base station transmission power is reduced, but UE combining complexity increases
Solution Approach 1:
The patent enables the UE to self-manage the combining process for repetitive data blocks by providing it with the necessary control information through the mode indication field. The UE uses this information to automatically select and apply the appropriate combining strategy (selective combining or soft combining) based on its own capabilities and channel conditions, reducing the need for complex network-controlled combining while still achieving coverage improvement and power reduction benefits.
4Productivity
If dynamic activation of multiple carriers is implemented, then data rate increases and resource utilization improves, but UE power consumption and complexity increase
Solution Approach 1:
The patent implements dynamic carrier activation where the UE only activates and processes the number of carriers currently indicated by the network through the mode indication field. This dynamic approach allows the UE to consume power proportional to the actual data rate requirement rather than maintaining full multi-carrier capability continuously, thus improving data rate when needed while reducing power consumption during lower traffic periods.
Solution Approach 2:
The patent uses parameter changes in the mode indication field to control UE power consumption. By encoding different carrier activation states in this field, the network can signal the UE to activate or deactivate specific carriers based on traffic demand. The UE adjusts its power consumption by changing its operational state according to these parameter changes, achieving high data rate when multiple carriers are activated while conserving power when fewer carriers are needed.
Data Source
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AI summary
A signaling mechanism is provided to indicate to the user equipment which mode is currently in use for uplink and/or downlink transmission in a system supporting different transmission modes of a multicarrier radio system, such as a HSPA system or another radio system. Using such signaling a particular mode can be dynamically or semi-dynamically activated according to the need, UE reported events or measurements, BS measurements, type of service, DRX cycle in use etc.