Neighboring Cell Interference Control via Common E-RGCH Serving Grant Adjustment
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Solution Overview
Problem
The existing communication systems lack an effective mechanism to control neighboring cell interference during uplink transmission in CELL-FACH and idle states, which can lead to reduced throughput and communication performance.
Innovation Solution
A method and apparatus that utilize a common Enhanced Dedicated Channel Relative Grant Channel (E-RGCH) to broadcast a primary scrambling code and channelization code, allowing user equipment (UE) to monitor and adjust its serving grant based on predefined conditions, thereby controlling interference by lowering the serving grant when interference thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE in CELL-FACH state or idle state performs uplink transmission without neighboring cell interference control, then uplink transmission rate is improved, but neighboring cell interference increases
Solution Approach 1:
The patent implements a feedback mechanism where the network side monitors uplink interference from UEs in CELL-FACH state or idle state, and sends control commands (uplink interference control indicators) to adjust the serving grant of these UEs. This closed-loop feedback system dynamically balances uplink transmission rate and neighboring cell interference by continuously monitoring interference levels and adjusting UE transmission parameters accordingly.
Solution Approach 2:
The patent changes the serving grant parameter of UEs in CELL-FACH state or idle state based on neighboring cell interference conditions. When interference exceeds thresholds, the network side adjusts the serving grant parameter to reduce UE transmission power or resource allocation, thereby controlling neighboring cell interference while maintaining acceptable uplink transmission performance.
2Object-generated harmful factors
If serving grant is reduced to control neighboring cell interference, then interference is reduced, but uplink throughput is reduced
Solution Approach 1:
The patent applies partial action by selectively controlling only those UEs whose transmission causes excessive neighboring cell interference, rather than reducing serving grants for all UEs. The network side identifies specific UEs exceeding interference thresholds and adjusts only their serving grants, leaving other UEs' transmission parameters unchanged. This selective approach controls interference while preserving uplink throughput for non-interfering UEs.
Solution Approach 2:
The patent implements dynamic adjustment of serving grants based on real-time interference conditions. The serving grant parameter is not statically reduced but dynamically modified in response to changing interference levels, allowing the system to adaptively balance interference control and throughput maintenance according to current network conditions.
3Object-generated harmful factors
If soft handover technology is used to control interference, then interference control is achieved, but it cannot be applied in CELL-FACH state or idle state
Solution Approach 1:
The patent creates a universal interference control mechanism that works across multiple UE states (CELL-FACH, idle, and connected states). Unlike soft handover which is state-specific, this invention implements a state-agnostic approach where the network side monitors and controls interference from UEs regardless of their current state, sending control commands through appropriate channels for each state. This multi-functional solution provides consistent interference control across all UE operational states.
Data Source
Figure 1~2
AI summary
Embodiments of the present invention provide a method and an apparatus for controlling a serving grant of a user terminal UE of a neighboring cell, and a user terminal, a base station, a radio network controller and a communication system having this apparatus. The method is used for controlling a UE in a CELL-FACH state or in an idle state of a neighboring cell of each cell through a common E-RGCH channel of each cell, where the UE in the CELL-FACH state or in the idle state obtains a control command by monitoring a common E-RGCH channel of a neighboring cell of a cell to which the UE belongs, thereby adjusting a serving grant of the UE. The method includes: further setting at least one controlled condition; determining whether the UE satisfies the at least one controlled condition; and when the UE satisfies the at least one controlled condition, adjusting a serving grant of the UE based on the obtained control command. Through the method and the apparatus for controlling a serving grant of a UE of a neighboring cell according to the embodiments of the present invention, interference control may be performed on the UE in the CELL-FACH state or in the idle state of the neighboring cell, and at the same time, throughput of the UE may be prevented from being reduced excessively, thereby improving communication performance.