Adaptive Uplink Resource Allocation for Channel Quality Feedback
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Solution Overview
Problem
In LTE systems, the fixed bandwidth allocation for uplink scheduling of channel quality information (UCI) often results in inadequate resources for transmission, leading to unsatisfactory performance when the number of bits exceeds the allocated bandwidth.
Innovation Solution
The method involves a base station allocating resource blocks dynamically based on the number of bits of channel quality information, allowing adaptive allocation of uplink scheduling bandwidth by including a resource block allocation field in the control signaling, ensuring that only the necessary channel quality information is transmitted on the uplink shared channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed range bandwidth is allocated for UCI transmission, then device complexity is reduced and scheduling is simplified, but transmission performance deteriorates when the number of UCI bits exceeds the allocated bandwidth
Solution Approach 1:
The patent implements dynamic bandwidth allocation for UCI transmission by allowing the base station to flexibly adjust the number of resource blocks allocated to UCI based on the actual amount of channel quality information that needs to be transmitted. This dynamic adjustment mechanism resolves the contradiction by adapting the allocated bandwidth to match the actual transmission needs, thereby maintaining transmission performance while avoiding unnecessary complexity for small UCI payloads.
2Reliability
If adaptive bandwidth allocation is implemented for UCI transmission, then transmission performance is improved, but device complexity and scheduling difficulty increase
Solution Approach 1:
The patent changes the parameter of allocated bandwidth from a fixed value to a dynamically adjustable parameter based on the number of UCI bits. By making the bandwidth parameter adaptive to the actual information volume, the system achieves improved transmission performance without requiring complex scheduling algorithms, as the adjustment is directly proportional to the UCI payload size.
3Ease of operation
If fixed bandwidth is allocated for UCI, then resource allocation is simple and deterministic, but resource adequacy deteriorates when UCI bit count exceeds allocation
Solution Approach 1:
The patent transforms the static bandwidth allocation into a dynamic one that automatically adjusts to the UCI payload size. This ensures that sufficient bandwidth resources are always available when needed, while maintaining simple allocation procedures through direct proportionality between UCI bit count and allocated resource blocks.
Data Source
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AI summary
Embodiments of the present invention relate to a method, a base station and user equipment for transmitting channel quality information. The method includes: when channel quality information of Y downlink carriers is needed to be fed back by a user equipment to a base station through X uplink carriers, allocating, by the base station, resource blocks to the user equipment according to the number of bits of the channel quality information and a set of resource block numbers that corresponds to a configuration X/Y, in which X and Y are positive integers greater than or equal to 1; and configuring, by the base station, the number of the allocated resource blocks in a control signaling for uplink scheduling UL-grant, and sending, by base station, the signaling to the user equipment. It can be seen that, the base station can allocate the resource blocks to the user equipment according to the number of the bits of the channel quality information and the set of resource block numbers. As a result, uplink scheduling bandwidth can be adaptively allocated for the transmission of the channel quality information. In addition, the drawback that the transmission performance cannot be guaranteed due to the fixed bandwidth resources through which the user equipment transmits the channel quality information can be resolved.