Shared Downlink Dedicated Physical Channel in NB-TDD Systems
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Solution Overview
Problem
In NB-TDD communication systems, the dedicated use of downlink dedicated physical channels (DL-DPCH) for control parameters is inefficient, as it unnecessarily dissipates system resources due to the channel being fully allocated for small control data, even when not all resources are utilized.
Innovation Solution
The method involves allocating two time slots in an NB-TDD radio frame as a shared DL-DPCH for multiple UEs, allowing data and control information to be transmitted and extracted efficiently, reducing the need for dedicated channels by sharing the channel resources between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DL-DPCH is dedicatedly allocated to one UE for control parameter transmission, then the control parameter can be reliably transmitted, but system resources are unnecessarily dissipated when the control data size is small
Solution Approach 1:
The patent merges the data areas of two time slots that form a DPCH, allowing control parameters for multiple UEs to be transmitted in a shared channel. Instead of allocating separate dedicated channels for each UE, the invention combines resources from two time slots at the same position in two subframes to create a shared control channel that serves multiple UEs simultaneously, thereby reducing overall system resource consumption while maintaining transmission reliability
Solution Approach 2:
The patent makes the DL-DPCH universal by enabling it to serve multiple UEs rather than being dedicated to a single UE. The shared control channel can carry control parameters for multiple UEs multiplexed together, allowing the same physical channel structure to fulfill multiple functions and serve multiple users, thus improving resource utilization efficiency
2Ease of operation
If two time slots are allocated as a DPCH for one UE, then control parameters can be transmitted, but the channel resources are wasted when control data size is small
Solution Approach 1:
The patent merges the data areas of two time slots that form a DPCH, allowing control parameters for multiple UEs to be transmitted in a shared channel. Instead of allocating separate dedicated channels for each UE, the invention combines resources from two time slots at the same position in two subframes to create a shared control channel that serves multiple UEs simultaneously, thereby reducing overall system resource consumption while maintaining transmission reliability
Solution Approach 2:
The patent makes the DL-DPCH universal by enabling it to serve multiple UEs rather than being dedicated to a single UE. The shared control channel can carry control parameters for multiple UEs multiplexed together, allowing the same physical channel structure to fulfill multiple functions and serve multiple users, thus improving resource utilization efficiency
Data Source
AI summary
A method and apparatus for sharing a DL-DPCH in an NB-TDD system. Two time slots at the same position in two subframes forming one radio frame are allocated as a DPCH for two UEs. A Node B arranges data and control information for the UEs in the two time slots and transmits the data and control information to the UEs. The UEs extract the data and control information from the two time slots and acquire the data and control information destined for the individual UEs.