Semi-persistent Resource Allocation in LTE Uplink
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Solution Overview
Problem
In the LTE mobile communication system, the timing of the downlink radio resource (PDSCH) allocated in persistent scheduling cannot be changed freely due to a fixed time difference with the uplink radio resource (PUCCH), leading to potential collisions and inefficient resource utilization.
Innovation Solution
A method is introduced where the mobile station and radio base station use persistent information and an uplink radio resource adjustment signal to flexibly adjust the timing of the downlink radio resource (PDSCH) allocation, avoiding collisions by modifying the uplink radio resource (PUCCH) identification numbers or resource block numbers, allowing for semi-fixed allocation of radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the timing of downlink radio resource (PDSCH) is fixed with a fixed time difference to uplink radio resource (PUCCH), then the resource allocation is simple and stable, but the timing cannot be changed freely leading to collisions and inefficient resource utilization
Solution Approach 1:
The patent applies dynamics by making the downlink radio resource timing adjustable rather than fixed. The base station can dynamically change the timing of PDSCH allocation relative to PUCCH based on system conditions, while the mobile station adapts to these changes through receiving timing adjustment indications. This resolves the contradiction by enabling flexibility (improving adaptability) while maintaining a relatively simple mechanism through centralized control (limiting complexity growth).
Solution Approach 2:
The patent changes the timing parameter of downlink radio resource allocation from a fixed value to an adjustable parameter. The base station modifies the timing offset between PDSCH and PUCCH based on resource utilization conditions, and this parameter change is communicated to the mobile station. This allows flexible timing adjustment (improving adaptability) while using a controlled parameter modification approach (managing complexity).
2Productivity
If downlink radio resource timing is adjusted to avoid collisions, then resource utilization efficiency improves, but the fixed time difference constraint limits the adjustment capability
Solution Approach 1:
The patent enables dynamic timing adjustment of PDSCH allocation by allowing the base station to modify the time difference between downlink and uplink resources based on system conditions. This dynamic adjustment capability improves resource utilization efficiency by avoiding collisions (improving productivity) while maintaining the necessary adaptability through controlled flexibility (preserving adaptability).
Solution Approach 2:
The patent modifies the timing offset parameter between PDSCH and PUCCH to optimize resource allocation. By changing this parameter based on resource utilization conditions, the system achieves better productivity through improved resource efficiency while maintaining adaptability through parameter flexibility. The parameter change approach allows precise control over the timing relationship.
Data Source
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AI summary
A radio resource selecting method for selecting, semi-fixedly, a radio resource to be allocated to an uplink response signal indicates a reception state of a fixedly allocated downlink signal, from a plurality of radio resources defined successively on a radio resource space formed with the frequency axis and the code axis. The method comprises the steps of: (A) generating first specification information for specifying, from the plurality of radio resources, radio resources to be allocated to the uplink response signal; (B) notifying the generated first specification information by an RRC message; (C) generating second specification information for specifying, from the plurality of radio resources, radio resources to be allocated to the uplink response signal; (D) notifying the generated second specification information by a PDCCH; and (E) selecting radio resources to be allocated to the uplink response signal, on the basis of the notified first specification information and the notified second specification information. The first specification information is information for specifying absolute identification information of radio resources to be allocated to the uplink response signal, from the plurality of radio resources; and the second specification information is information for specifying relative identification information for further specifying radio resources from the radio resources specified by the first specification information.