CQICH Allocation Request for Fast Base Station Switching

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Solution Overview

Problem

In the IEEE 802.16 communication system, mobile stations (MS) experience delays in setting up connections after fast base station switching due to the failure to acquire Channel Quality Information Channel (CQICH) allocation from the target anchor base station, leading to network re-entry operations and prolonged connection setup times.

Innovation Solution

The MS proactively sends a CQICH allocation request to the target anchor base station using a Bandwidth Request header, ensuring allocation of a CQICH for efficient channel quality information transmission and reducing connection setup delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the MS performs fast base station switching to improve connection speed, then switching speed is improved, but CQICH allocation failure occurs leading to network re-entry operations

Engineering Contradiction:

Improveconnection setup speedVSAvoidCQICH allocation success rate

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent applies preliminary action by having the MS send a CQICH allocation request to the target anchor BS before completing the handover process. This proactive approach ensures that the CQICH resource is reserved in advance, preventing allocation failures that would otherwise trigger network re-entry operations and delay connection setup.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If the MS waits for CQICH allocation from the target anchor BS after switching, then allocation accuracy is improved, but connection setup time increases

Engineering Contradiction:

ImproveCQICH allocation accuracyVSAvoidconnection setup time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent resolves this contradiction by performing CQICH allocation requests in advance during the handover process. The MS sends the allocation request to the target anchor BS before the handover is complete, ensuring both accurate allocation and minimal delay by avoiding post-switching waiting periods.

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If the MS sends CQICH allocation request proactively to reduce delays, then connection setup time is reduced, but message overhead increases

Engineering Contradiction:

Improveconnection setup timeVSAvoidmessage overhead

Core Design Contradiction:

Loss of timeVSQuantity of substance

Solution Approach 1:

The patent applies partial action by sending only the necessary CQICH allocation request message to the target anchor BS, rather than initiating a full network re-entry sequence. This selective messaging approach reduces overall message overhead while still achieving the goal of faster connection setup by preventing allocation failures.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8380197B2System and method for allocating a channel quality information channel in a communication system

Publication Date: 2013.02.19 NOKIA TECHNOLOGIES OY

AI summary

A method for requesting allocation of a Channel Quality Information Channel (CQICH) by a Mobile Station (MS) in a communication system. The method includes switching, by the MS, from a serving anchor Base Station (BS) to a target anchor BS, detecting an absence of a CQICH allocated from the target anchor BS, and transmitting, from the MS to the target anchor BS, a CQICH allocation request. The CQICH allocation request includes a CQICH allocation request header including a basic Connection IDentifier (CID) of the MS and a Header Check Sequence (HCS) for the CQICH allocation request header.