Scheduling Information Transmission at Serving Cell Change
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Solution Overview
Problem
Existing mobile communication systems face inefficiencies in uplink dedicated transport channels due to bandwidth constraints and conservative power allocation, leading to suboptimal performance, especially in high-speed data applications like video conferencing, where uplink speeds lag behind downlink speeds.
Innovation Solution
Distributing packet scheduler functionality from the radio network controller to Node B, enabling faster scheduling and more efficient power resource sharing through enhanced dedicated transport channels (EDCH), and implementing a method where user equipment (UE) sends scheduling information only when the serving cell changes to a new Node B that does not belong to the previous serving radio link set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If scheduling information is sent every time serving cell changes, then uplink resource allocation responsiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter of scheduling information transmission from always sending to conditionally sending based on whether the new serving cell belongs to the previous radio link set. This parameter change reduces unnecessary signaling while ensuring timely resource allocation when needed.
Solution Approach 2:
The patent extracts the essential condition for sending scheduling information (when new serving cell does not belong to previous radio link set) from the general case of all serving cell changes. This extraction eliminates redundant signaling while preserving the critical resource allocation updates.
2Productivity
If packet scheduler functionality is distributed to Node B, then scheduling speed and power resource sharing efficiency are improved, but system complexity increases
Solution Approach 1:
The patent segments the packet scheduler functionality by distributing it from the radio network controller to individual Node Bs. This segmentation enables faster local scheduling decisions and more efficient power resource sharing while the system manages the complexity through standardized interfaces.
Solution Approach 2:
The patent implements dynamic scheduling at Node B level, allowing real-time power resource allocation and scheduling decisions based on current channel conditions and traffic requirements, thereby improving productivity despite increased system complexity.
3Stability of the object's composition
If conservative power allocation is used in uplink dedicated transport channels, then system stability is improved, but uplink performance and data rates are worsened
Solution Approach 1:
The patent implements dynamic power allocation in uplink dedicated transport channels through Node B-based packet scheduling. This allows the system to adapt power allocation to current conditions, improving uplink performance and data rates while maintaining stability through controlled resource management.
Solution Approach 2:
The patent changes the power allocation parameter from conservative fixed allocation to dynamic allocation based on scheduling decisions at Node B, enabling higher uplink data rates and improved performance while maintaining system stability through regulated resource distribution.
Data Source
AI summary
The invention provides, according to one aspect, a method of scheduling information in a communication system at serving cell change. When a serving cell changes for a user equipment (UE), it is determined whether the new serving cell belonged to the previous serving enhanced data channel (EDCH) radio link set (RLS). The user equipment then sends scheduling information (SI) in the first MAC-e protocol data unit (PDU) sent in uplink after completion of the serving cell change only when it is determined that the new serving cell did not belong to the previous serving EDCH RLS. In other words, the UE sends the SI at serving cell change only when the base station (node B) has also changed.