Uplink Resource Allocation for CQI Relay Overhead Reduction
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Solution Overview
Problem
In next-generation mobile communication systems, the increased carrier frequency leads to higher propagation loss, necessitating more base stations to maintain coverage, which increases costs. Additionally, the overhead of Channel Quality Indicator (CQI) reporting on the uplink channel is a challenge, especially when relay stations are involved, as it requires resource allocation for efficient CQI relay transmission from mobile stations to base stations via relay stations.
Innovation Solution
A communication system that includes a base station apparatus capable of allocating resources for CQI reporting, with a relay station allocation unit determining channel allocations for relay stations and a mobile station allocation unit determining channel allocations for mobile stations to reduce uplink overhead. This system involves a base station that allocates resource blocks for relay stations to relay CQI to the base station and for mobile stations to transmit CQI to relay stations, optimizing resource use and reducing relay transmission overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If relay station apparatus is provided between base station apparatus and mobile station apparatus, then transmission power of mobile station apparatus is reduced, but overhead of uplink for CQI report increases
Solution Approach 1:
The patent introduces a relay station as an intermediary node between the mobile station and base station. The mobile station reports CQI to the relay station, which then relays this information to the base station. This intermediary structure allows the mobile station to use lower transmission power while the relay station handles the CQI forwarding to the base station, thus resolving the contradiction between reduced transmission power and increased overhead.
2Area of stationary object
If relay station apparatus is provided between base station apparatus and mobile station apparatus, then cell size is effectively extended, but device complexity increases
Solution Approach 1:
The patent segments the communication system into distinct functional units: base station, relay station, and mobile station. Each entity has clearly defined roles and responsibilities. The relay station is segmented as a separate network element with specific functions for CQI relay transmission, which manages complexity by creating modular, independent components rather than a monolithic system.
Solution Approach 2:
The relay station apparatus is designed with multi-functionality, serving both as a communication node for data transmission and as a relay point for CQI reporting. This universal design allows a single device to perform multiple functions, extending cell coverage while avoiding the need for separate dedicated relay infrastructure, thus managing system complexity.
3Productivity
If resource allocation is performed for both mobile station CQI report and relay station CQI relay transmission, then communication efficiency is improved, but overhead management becomes more difficult
Solution Approach 1:
The patent implements preliminary action by having the base station allocate uplink resources for relay station CQI relay transmission in advance, before the actual CQI reporting occurs. This pre-allocation of resources simplifies the overall resource management by establishing a dedicated pathway for relayed CQI information, reducing the complexity of real-time resource allocation and improving communication efficiency.
Data Source
AI summary
Provided is a communication system that can allocate resources on an uplink for a CQI report, and can reduce the overhead of the CQI relay transmission from a relay station apparatus to a base station apparatus. To each mobile station apparatus (501, 502) that transmits CQI directly to a base station apparatus (500), resource blocks on a base station apparatus uplink to be used for the transmission of each CQI to the base station apparatus are allocated. Resource blocks on the base station apparatus uplink to be used for each relay station to relay-transmit to the base station apparatus CQI received from the mobile station apparatuses are allocated on the basis of the allocation result of resource blocks on a relay station apparatus uplink for each relay station apparatus (510, 520). To mobile station apparatuses that transmit CQI to the base station apparatus via each relay station apparatus, resource blocks on the relay station apparatus uplink to be used for the transmission of CQI to the relay station apparatus are allocated.