Uplink Signaling for CoMP Interference Management
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Solution Overview
Problem
In wireless communication systems, particularly in CoMP, inter-cell interference in uplink control channels is significant, leading to reduced network capacity and increased interference, especially in heterogeneous deployments with short inter-site distances.
Innovation Solution
The method involves determining a base sequence index and cyclic shift hopping sequence based on received identification parameters, partitioning uplink control regions between cells, and configuring UEs with dedicated parameters to minimize interference, including the use of virtual cell IDs for resource allocation and power control, to manage inter-cell interference and enhance resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple base stations transmit the same signal to a UE in CoMP mode, then received signal strength at the UE is greatly improved, but inter-cell interference in uplink control channels increases significantly
Solution Approach 1:
The patent segments the uplink control channel resources by partitioning them into cell-specific regions. Each base station is assigned dedicated time-frequency resources for receiving uplink control information from UEs, preventing interference between neighboring base stations in a CoMP system. This segmentation allows multiple base stations to operate simultaneously without mutual interference.
Solution Approach 2:
The patent implements local quality by assigning different resource allocation patterns to different cells. Each cell has its own uplink control channel resource configuration, allowing resources to be optimized locally for each cell's specific interference environment while maintaining overall system coordination.
2Productivity
If uplink control channel resources are shared among multiple cells, then resource utilization efficiency increases, but interference from adjacent base stations deteriorates reception quality
Solution Approach 1:
The patent divides uplink control channel resources into cell-specific segments, where each cell has dedicated time-frequency resources. This segmentation ensures that while resources are efficiently utilized within each cell, interference between cells is eliminated by assigning non-overlapping resource sets to adjacent base stations.
3Ease of operation
If UEs transmit uplink control information using conventional random access, then access simplicity is maintained, but uplink resource allocation overhead increases in CoMP systems
Solution Approach 1:
The patent implements preliminary action by pre-configuring UEs with cell-specific uplink control channel resource information during the initial connection setup. This preliminary configuration eliminates the need for complex dynamic resource allocation negotiations during random access, reducing overhead while maintaining simplicity.
Data Source
AI summary
A method of operating a wireless communication system is disclosed (FIG. 6). The method includes receiving a virtual cell identification (VCID) parameter (600) from a remote transmitter. A base sequence index (BSI) and a cyclic shift hopping (CSH) parameter (604,606) are determined in response to the VCID. A pseudo-random sequence is selected in response to the BSI and CSH (610,612). A reference signal is generated using the selected pseudo-random sequence (614).