CoMP Scheduling via Control Channel Notification
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Solution Overview
Problem
In CoMP-enabled LTE-A systems, existing methods for notifying User Equipment (UE) of Physical Downlink Shared Channel (PDSCH) radio resource information are inefficient, particularly in adapting to changing traffic and radio channel conditions, leading to potential handover delays and increased failure probabilities.
Innovation Solution
A centralized controller determines and notifies the UE of radio resource configurations for PDSCH transmission using control channels like PDCCH, eliminating the need for higher layer signaling, thereby allowing seamless switching between cells without handover, and providing necessary information such as CRS transmission resources, MBSFN subframe details, and subframe synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for notifying UE of PDSCH radio resource information are used, then the system maintains compatibility with legacy protocols, but the scheduling efficiency is reduced and handover delays increase
Solution Approach 1:
The patent introduces control channels (PDCCH) as an intermediary mechanism to notify the UE of PDSCH radio resource information. Instead of relying on higher layer signaling which causes delays, the control channels provide real-time resource allocation information, enabling faster scheduling decisions and reducing handover delays while maintaining protocol compatibility.
Solution Approach 2:
The system performs preliminary notification of radio resource information through control channels before the actual PDSCH transmission. This advance notification allows the UE to prepare for upcoming transmissions and handovers, reducing reaction time and improving scheduling efficiency without requiring protocol changes.
2Reliability
If higher layer signaling is used to notify UE of radio resource information, then the information can be transmitted reliably, but the response time increases and adaptability to changing conditions decreases
Solution Approach 1:
The patent implements dynamic resource notification by using control channels that can be updated in real-time based on changing traffic and channel conditions. Unlike static higher layer signaling, the control channels provide flexible, adaptive resource allocation information that responds quickly to environmental changes while maintaining reliable transmission through robust control channel design.
3Loss of time
If seamless cell switching without handover is implemented, then handover delays are eliminated, but the complexity of resource management increases
Solution Approach 1:
The control channels serve multiple functions: they notify the UE of PDSCH radio resource information, support seamless cell switching, and provide coordination between multiple base stations in CoMP scenarios. This multi-functionality enables seamless cell switching without handover delays while managing complexity through a unified control mechanism rather than separate procedures for each function.
Data Source
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AI summary
Methods and apparatus are provided for scheduling in a communication system. A Coordinated Multi-point Transmission/Reception (CoMP) set of cells is determined for a terminal that supports a CoMP function. An indicator for use in scheduling one or more cells in the CoMP set and cell information corresponding to the indicator are transmitted to the terminal. Scheduling information with the indicator is transmitted to the terminal.