# US 8,570,950 B2 · Wireless communication system

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- Number: US 8,570,950 B2
- Document ID: US8570950B2
- Status: Granted
- Kind: B2
- Application number: 13/855,507
- Filed: 2013-04-02
- Published: 2013-08-22
- Granted: 2013-10-29
- Earliest claimed: 2000-12-11
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Minoru Kosaka
- Web page: https://patentgrep.com/patent/US8570950B2

## CPC

- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04J 4/00: Combined time-division and frequency-division multiplex systems (H04J13/00 takes precedence {; data transmission H04L5/26; telemetry G08C15/00})
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/12: Wireless traffic scheduling
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 76/14: Direct-mode setup
- H04B 7/265: {for channel frequency control}
- H04J 3/06: Synchronising arrangements {(for television systems H04N5/04; bit-synchronisation H04L7/00)}
- H04J 3/1694: {Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062)}
- H04W 56/002: {Mutual synchronization}
- H04W 56/0035: {detecting errors in frequency or phase}
- H04W 74/0816: with collision avoidance
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W 92/18: between terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04B: TRANSMISSION

## Abstract

A wireless communication system broadcasts a control signal at a first frequency band from a base station and allocates additional frequency band(s) for transmitting data by terminal(s). A control signal at the first frequency band indicates the location of the additional frequency band(s) and is not transmitted over the additional frequency band(s). Wireless data transmission is simultaneously performed over the first frequency band and the additional frequency band(s). Each terminal receives the control signal, which is used in time-synchronizing frames between the wireless data transmission at the first frequency band and the wireless data transmission at the additional frequency band(s). The control signal also includes control data for managing wireless data transmission of the terminal(s) at the first frequency band, and is utilized instead of a control signal at the additional frequency band(s).

## Claims

### Claim 1

A method of using a wireless communication system having a base station and one or more terminals, the wireless communication system carrying out wireless data communication by use of a first frequency band, the method comprising:
employing a centralized CSMA/CA and/or TDMA/TDD system as a wireless access system;
periodically broadcasting from the base station a control signal at the first frequency band, the control signal configured to manage wireless data transmission of the one or more terminals;
allocating, via the base station, in addition to the first frequency band, one or more frequency bands different from the first frequency band for data transmission of the one or more terminals, wherein the control signal at the first frequency band indicates the location of the one or more frequency bands which can be used, the control signal not being transmitted at the one or more frequency bands;
simultaneously performing the wireless data transmission at the first frequency band and the wireless data transmission at the one or more frequency bands;
receiving, at each of the one or more terminals, the control signal, which realizes a time synchronization of the wireless communication system, and thus, based on the time synchronization between the base station and the one or more terminals, the wireless data transmission at the one or more frequency bands is time-synchronized with the wireless data transmission at the first frequency band; wherein,
the control signal at the first frequency band comprises control data configured to manage wireless data transmission of the one or more terminals at the first frequency band, the control signal at the first frequency band being utilized instead of a control signal at the one or more frequency bands that is configured to manage wireless data transmission of the one or more terminals at the one or more frequency bands, the control signal at the first frequency band being utilized in synchronization of frames between the wireless data transmission at the first frequency band and the wireless data transmission at the one or more frequency bands, permitting the simultaneous wireless data transmission both on the first frequency band and on the one or more frequency bands.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
carrying out, at the base station, carrier sensing at a plurality of frequency bands available as the one or more frequency bands;
determining, at the base station, the one or more frequency bands to be used; and
notifying the one or more terminals of information indicating the allocation of the one or more frequency bands by use of the control signal transmitted from the base station.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
periodically receiving at each of the one or more terminals, in accord with the time synchronization at each terminal, the control signal transmitted from the base station; wherein
the wireless data transmission of the terminal is time-synchronized on the first frequency band and the one or more frequency bands; and
the wireless data transmission of the terminal at the first frequency band and the wireless data transmission of the terminal at the one or more frequency bands can be simultaneously carried out.

### Claim 4

A method of using a base station of a wireless communication system having the base station and one or more terminals, the wireless communication system carrying out wireless data communication by use of a first frequency band, the method comprising:
employing a centralized CSMA/CA and/or TDMA/TDD system as a wireless access system;
periodically broadcasting a control signal at the first frequency band, the control signal configured to manage wireless data transmission of the one or more terminals;
allocating, via the base station, in addition to the first frequency band, one or more frequency bands different from the first frequency band for data transmission of the one or more terminals, wherein the control signal at the first frequency band indicates the location of the one or more frequency bands which can be used, the control signal not being transmitted at the one or more frequency bands;
simultaneously receiving from the one or more terminals the wireless data transmission at the first frequency band and the wireless data transmission at the one or more frequency bands; wherein
a time synchronization of the wireless communication system is realized by the control signal transmitted from the base station at the first frequency band to each of the one or more terminals, and thus, based on the time synchronization between the base station and the one or more terminals, the wireless data transmission at the one or more frequency bands is time-synchronized with the wireless data transmission at the first frequency band; and
the control signal at the first frequency band comprises control data configured to manage wireless data transmission of the one or more terminals at the first frequency band, the control signal at the first frequency band being utilized instead of a control signal at the one or more frequency bands that is configured to manage wireless data transmission of the one or more terminals at the one or more frequency bands, the control signal at the first frequency band being utilized in synchronization of frames between the wireless data transmission at the first frequency band and the wireless data transmission at the one or more frequency bands, permitting the simultaneous wireless data transmission both on the first frequency band and on the one or more frequency bands.

### Claim 5 (depends on 4)

The method of using a base station according to claim 4, further comprising:
carrying out carrier sensing at a plurality of frequency bands available as the one or more frequency bands;
determining the one or more frequency bands to be used; and
notifying the one or more terminals of information indicating the location of the one or more frequency bands by use of the control signal.

### Claim 6

A method of using a terminal station of a wireless communication system comprised of a base station and at least the terminal, the wireless communication system carrying out wireless data communication by use of a first frequency band, the method comprising:
employing a centralized CSMA/CA and/or TDMA/TDD system as a wireless access system;
receiving a periodically-broadcast control signal from the base station at the first frequency band, the control signal configured to manage wireless data transmission by the terminal; and
simultaneously carrying out the wireless data transmission at the first frequency band and wireless data transmission at one or more frequency bands different from the first frequency band, the one or more frequency bands allocated by the base station in addition to the first frequency band for the wireless data transmission by the terminal station, the control signal of the first frequency band indicating the location of the one or more frequency bands which can be used, the control signal not transmitted at the one or more other frequency bands, wherein
a time synchronization of the wireless communication system is realized by the control signal received by the terminal station, and thus, based on the time synchronization between the base station and the terminal, the wireless data transmission at the one or more frequency bands is time-synchronized with the wireless data transmission at the first frequency band; and
the control signal at the first frequency band comprises control data configured to manage wireless data transmission by the terminal at the first frequency band, the control signal at the first frequency band being utilized instead of a control signal at the one or more frequency bands that is configured to manage wireless data transmission by the terminal at the one or more frequency bands, the control signal at the first frequency band being utilized in synchronization of frames between the wireless data transmission at the first frequency band and the wireless data transmission at the one or more frequency bands, permitting the simultaneous wireless data transmission both on the first frequency band and on the one or more frequency bands.

### Claim 7 (depends on 6)

The terminal station according to claim 6, wherein:
the wireless data transmission by the terminal station is time-synchronized on both the first frequency band and the one or more frequency bands; and
the wireless data transmission of the terminal at the first frequency band and the wireless data transmission at the one or more frequency bands can be simultaneously carried out.