Radio apparatus and communication system

• US 20070076581A1
• Filed: 09/14/2006
• Published: 04/05/2007
• Est. Priority Date: 09/14/2005
• Status: Active Grant

• Current Assignee: Hera Wireless S.A. (Fineur International S.A.)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Yasuhiro
• Granted Patent: US 8,223,644 B2
• Time in Patent Office: Days
• US Class Current: 370/203
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0086 Unequal error protection H04L27/00 and H04L1/004 take precedence for layer 1/2 aspects, e.g. bit loading
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

A control unit generates packet signals while controlling an interface (IF) unit, a modulation unit and a baseband processing unit. While dividing each packet signal into a plurality of partial periods, the control unit assigns data to at least part of each of the plurality of partial periods and sets the rate of data, for a partial period placed anterior to each packet signal, higher than that for a partial period placed posterior to the each packet signal. The IF unit, the modulation unit and the baseband processing unit transmit the packet signals thus generated.

Claims

1. A radio apparatus, comprising:

a generator which generates packet signals; and

.

a transmitter which transmits the packet signals generated by said generator,

wherein while dividing each packet signal into a plurality of partial periods, said generator assigns data to at least part of each of the plurality of partial periods such that a data rate for a partial period positioned in a front part of the each packet signal is higher than that for a partial period positioned in a posterior part of the each packet signal.

3. A radio apparatus according to claim 1, wherein the each packet signal is composed of a plurality of streams and said generator sets values defined by changing a modulation scheme or coding rate, as a data rate in the each packet signal.

2. A radio apparatus, comprising:

a generator which generates packet signals in a manner such that each packet signal is divided into a plurality of partial periods and a plurality of terminal apparatuses are assigned respectively to the plurality of partial periods by associating the plurality of partial periods respectively with the plurality of terminal apparatuses; and

a transmitter which transmits the packet signals generated by said generator,

wherein said generator assigns data to at least part of each of the plurality of partial periods, and when assigning the plurality of terminal apparatuses to the plurality of partial periods, respectively, said generator assigns a terminal apparatus, which is to transmit data of a high data rate, to a partial period positioned in a front part of packet signal.

4. A radio apparatus according to claim 2, wherein the each packet signal is composed of a plurality of streams and said generator sets values defined by changing a modulation scheme or coding rate, as a data rate in the each packet signal.

5. A radio apparatus, comprising:

a receiver which receives packet signals; and

a demodulation unit which demodulates the packet signals received by said receiver,

wherein while the packet signal received by said receiver is being divided into a plurality of partial periods, data is assigned to at least part of each of the plurality of partial periods, and a data rate for a partial period positioned in a front part of the packet signal is higher than that for a partial period positioned in a posterior part of the packet signal, and

wherein said demodulation unit adjusts the packet signal by adjusting the data rate.

6. A communication system, comprising

a base station apparatus which generates packet signals in a manner such that each packet signal is divided into a plurality of partial periods and a plurality of terminal apparatuses are assigned respectively to the plurality of partial periods by associating the plurality of partial periods respectively with the plurality of terminal apparatuses, and which transmits the generated packet signals;

and

a terminal apparatus which receives the packet signals transmitted from said base station apparatus,

wherein said base station apparatus assigns data to at least part of each of the plurality of partial periods, and when assigning the plurality of terminal apparatuses to the plurality of partial periods, respectively, said base station apparatus assigns a terminal apparatus of a high data rate to a partial period positioned in a front part of packet signal.