Radio Resource Block Group Signaling for Flexible Frequency Scheduling
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Solution Overview
Problem
The existing non-contiguous band allocation in LTE-Advanced limits frequency scheduling flexibility due to constraints on the number of clusters, resulting in a limited improvement effect on system performance and an increase in signaling bits.
Innovation Solution
A radio communication apparatus and method that add a predetermined offset value to the start or end index of frequency resource indices, generating notification information to enhance frequency scheduling flexibility while minimizing the increase in signaling bits, allowing for the allocation of cluster bandwidths including one RBG.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-contiguous band transmission is implemented to improve frequency scheduling flexibility, then sector throughput is improved, but the number of signaling bits increases
Solution Approach 1:
The frequency band is divided into multiple clusters, where each cluster represents a contiguous block of resource blocks. The base station can allocate up to two separate clusters to a terminal, enabling non-contiguous band transmission. This segmentation allows flexible frequency resource allocation while managing signaling overhead by limiting the number of clusters to two.
2Loss of information
If the number of clusters in non-contiguous bands is limited to two to decrease signaling bits, then signaling overhead is reduced, but frequency scheduling flexibility is constrained
Solution Approach 1:
The patent changes the parameter of maximum cluster number from one to two, providing a balance between signaling overhead and scheduling flexibility. By allowing up to two clusters per terminal, the system achieves better frequency diversity and scheduling flexibility compared to single-cluster allocation, while keeping signaling bit increase manageable through the use of compact cluster indication methods.
3Device complexity
If contiguous band transmission is used to simplify resource allocation, then device complexity is reduced, but frequency scheduling flexibility is limited
Solution Approach 1:
The system dynamically switches between contiguous and non-contiguous band transmission modes based on channel conditions and scheduling requirements. When channels are favorable, contiguous allocation simplifies processing; when frequency diversity is needed, non-contiguous allocation with up to two clusters provides flexibility. This dynamic approach balances complexity and adaptability.
Data Source
AI summary
Provided are a radio transmission apparatus and a radio transmission method whereby the increase of number of signaling bits can be suppressed and further the flexibility of frequency scheduling can be improved. A notified RBG calculating unit (203) that adds a predetermined offset value of “1” or “−1” to one of the start RBG number and the end RBG number of allocated RBG number information (b′i) output by a scheduling unit (201), thereby calculating notified RBG number information (bi). An RBG total number setting unit (204) calculates the total number of RBGs, which is to be notified, by adding “1” to the total number of allocated RBGs. A notified information generating unit (205) applies the notified RBG number information (bi) and the notified total number of RBGs (Nrb′) to a predetermined formula, thereby generating and transmitting, to terminals, notified information (r).