Virtual Cell ID Orthogonal Resource Allocation in CoMP Systems
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Solution Overview
Problem
The introduction of downlink multi-point coordination technology in LTE R11 systems leads to insufficient uplink control channel capacity due to increased channel feedback demands, which is exacerbated by co-channel interference in traditional single-point reception modes, especially in CoMP scenarios where multiple wireless reception points share a cell ID, resulting in degraded control channel performance.
Innovation Solution
The method involves grouping reception points into clusters sharing a virtual cell ID, with each reception point receiving and transmitting this ID to user equipment, allowing them to determine orthogonal resources based on the virtual cell ID and resource index information, thereby optimizing the tradeoff between orthogonal resource allocation and interference intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional single-point reception mode is adopted for control channel, then implementation is simple, but co-channel interference degrades control channel performance
Solution Approach 1:
The invention segments the control channel reception by introducing multiple reception points (first reception point and second reception point) that independently receive and process control channel signals. Each reception point uses its own received signal sequence generated with a specific radius parameter, allowing parallel processing and selection of the best received signal, thereby reducing co-channel interference while maintaining implementation simplicity.
2Productivity
If downlink multi-point coordination technology is introduced, then data channel capacity increases, but uplink control channel capacity becomes insufficient due to increased feedback demands
Solution Approach 1:
The invention dynamically adjusts the radius parameter for generating received signal sequences based on the specific reception point and control channel type. The first reception point uses a first radius while the second reception point uses a second radius, allowing flexible adaptation to different coordination scenarios. This dynamic parameter adjustment enables the system to handle increased feedback demands from multi-point coordination while maintaining efficient control channel capacity utilization.
3Reliability
If orthogonal resources are allocated for all user equipments in macro cell, then orthogonal resources are ensured for respective user equipments, but orthogonal resources become insufficient
Solution Approach 1:
The invention applies local quality by assigning different radius parameters to different reception points based on their specific roles and coverage areas. The first reception point uses a first radius while the second reception point uses a second radius, creating localized resource allocation strategies. This allows orthogonal resources to be efficiently utilized in each local area without requiring sufficient resources for all user equipments across the entire macro cell, thereby resolving the resource insufficiency problem while maintaining allocation reliability.
Data Source
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AI summary
The invention provides a solution, in a reception point of a communication system, of providing a user equipment with a virtual cell ID, where firstly a virtual cell ID corresponding to the reception point is received from a network control device, the virtual cell ID being used for indicating a cluster to which the reception point belongs; then the virtual cell ID is provided to at least one user equipment served by the reception point; and finally resource index information corresponding to each user equipment among the at least one user equipment is transmitted respectively to the each user equipment. There is further provided a solution, in a user equipment of a communication system, of determining an orthogonal resource, where firstly a virtual cell ID of the reception point is obtained; then resource index information corresponding to the present user equipment is received from the reception point; next an orthogonal resource corresponding to the present user equipment is determined according to the virtual cell ID and the resource index information; and finally uplink control information is transmitted to the reception point over the determined orthogonal resource. A tradeoff between the number of orthogonal resources and interference intensity can be achieved by applying of the invention.