Base Station Broadcast Channel Frequency Hopping

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Solution Overview

Problem

In scalable bandwidth communication systems, minimum capability mobile stations face throughput and power consumption issues due to frequent frequency switching to receive broadcast channel data, leading to decreased user and system throughput, and increased peak power that degrades error rate performance.

Innovation Solution

A base station that transmits a multicarrier signal with a setting section to set the transmission band for broadcast channel data in one of multiple frequency bands, allowing the band to change over time, enabling efficient BCH data transmission without requiring mobile stations to switch frequencies, thus reducing power consumption and maintaining high throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If BCH data is transmitted in the center frequency band, then all mobile stations can receive broadcast information, but minimum capability mobile stations must switch frequency to receive both BCH and user data, decreasing throughput and increasing power consumption

Engineering Contradiction:

Improvebroadcast information receptionVSAvoiduser throughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent applies frequency hopping to dynamically change the transmission band for BCH data across different time periods. Instead of using a fixed center frequency band, the transmission band is varied so that minimum capability mobile stations can receive BCH data in one frequency band and user data in another band without simultaneous reception requirements, thereby eliminating the need for frequency switching and maintaining continuous throughput.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces time as an additional dimension by transmitting different BCH data blocks in different time periods across different frequency bands. This temporal separation allows mobile stations to receive BCH data and user data at different times without frequency switching, transforming a frequency-domain conflict into a time-domain solution.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If minimum capability mobile stations switch frequency to receive BCH data, then broadcast information can be received, but user throughput and system throughput decrease due to switching time

Engineering Contradiction:

Improvebroadcast channel receptionVSAvoidfrequency switching time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent uses frequency hopping to dynamically allocate different frequency bands for BCH data transmission at different time periods. This ensures that when minimum capability mobile stations are receiving user data in one frequency band, BCH data is transmitted in a different band, eliminating the need for frequency switching and continuous time loss.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent enables continuous reception of both BCH data and user data without interruption by transmitting them in different frequency bands at different time periods. Mobile stations can continuously receive user data in their assigned band while BCH data is transmitted in other bands at different times, maintaining uninterrupted communication flow.

Inventive Principle:

Principle #20Continuity of useful action

3Adaptability or versatility

If BCH data is transmitted using center frequency band, then broadcast information is available to all stations, but peak power increases degrading error rate performance

Engineering Contradiction:

Improvesystem-wide broadcast coverageVSAvoiderror rate performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies frequency hopping to distribute BCH data transmission across multiple frequency bands at different time periods rather than concentrating all transmissions in the center frequency band. This dynamic allocation reduces peak power requirements by spreading the transmission load, thereby improving error rate performance while maintaining system-wide coverage.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments BCH data into multiple blocks transmitted at different time periods in different frequency bands. This segmentation distributes the transmission power requirements across time and frequency, avoiding the high peak power concentration that would occur with simultaneous center band transmission, thus improving reliability.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8401051B2Base station apparatus that communicates with mobile station apparatuses, mobile station apparatus that communicates with a base station and transmission band setting method performed in a base station

Publication Date: 2013.03.19 INTERDIGITAL PATENT HOLDINGS INC

AI summary

A base station effectively transmits BCH data and includes an encoding unit for encoding the BCH data; a modulation unit for modulating the BCH data after being encoded; a transmission band setting unit for setting a BCH data transmission band in one of sub carriers constituting an OFDM symbol; encoding units for encoding user data, modulation units for modulating user data after being encoded; and an IFFT unit for mapping the BCH data and the user data to each of the sub carriers and performing IFFT to generate an OFDM symbol. Here, the IFFT unit maps the BCH data to the sub carrier existing in the transmission band set by the transmission band setting unit among the plurality of sub carriers.