Radio LAN system implementing simultaneous communication with different types of information and communication method for the same

• US 7,634,581 B2
• Filed: 05/12/2006
• Issued: 12/15/2009
• Est. Priority Date: 05/02/2001
• Status: Expired due to Fees

• Current Assignee: OKI Electric Industry Company Limited
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Etoh, Hiroshi
• Primary Examiner(s): Lim; Krisna
• Application Number:
  US11/432,406
• Publication Number:
  US 20060203890A1
• Time in Patent Office: 1,313 Days
• Field of Search: 709/248, 375/130, 375/135, 375/136
• US Class Current: 709/248
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 47/24 Traffic characterised by specific attributes, e.g. priority or QoS
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Abstract

A radio LAN (Local Area Network) system includes an access point and a mobile or a fixed station each having a physical layer implemented by a direct spread spectrum system. The LAN system uses different spread codes, maintains transmission power semi-fixed, and selects a frequency and a frequency band in accordance with the kind and amount of information. A data link layer above each physical layer includes an LLC (Logical Link Control) sublayer and an MAC (Media Access Control) sublayer. The MAC sublayer uses a CDMA (Code Division Multiple Access) system as an access system for thereby implementing a data structure in accordance with the kind and amount of information.

Claims

1. An access point forming a limited service area for a radio LAN (Local Area Network), said access point comprising:

a transmitter for spreading an information signal in a direct spread spectrum system, which spreads a frequency band width of the information signal, and transmitting a spread information signal; and

a receiver for receiving the spread information signal and inversely spreading said spread information signal;

said transmitter comprising;

a plurality of information transmitting circuits each for multiplying, in the direct spread spectrum system, the information signal and a particular one of a plurality of spread codes; and

a transmission controller for selecting, in accordance with at least one of a kind and an amount of the information signal, one of a plurality of frequency bands and frequencies respectively assigned to said plurality of information transmitting circuits and one of a plurality of packets to use for transmission of the information signal, and maintaining transmission power of the spread information signal semi-fixed,

wherein the kind of the information signal is any one of a control packet sent from said access point to a station present in said limited service area, a channel packet for data and a channel packet for voice.

2. The access point in accordance with claim 1, wherein said control packet comprises a field storing frame synchronization information of the control packet, an information field identifying said access point, a voice channel information field indicative of a channel number available for voice, a data channel information field indicative of a channel number available for data, a control information field indicative of various kinds of request control, and a control data field storing error control data of the control packet,

the control information field storing location confirmation request information for requesting confirmation of a location of said station present in the service area, registration request information for requesting registration of said station newly entering the service area, call information for requesting communication from said access point to said station, and report information indicative of channel release.

3. The access point in accordance with claim 1, wherein the channel packet for data comprises a field storing frame synchronization information of the channel packet, a destination information field identifying a destination of the information signal, a source information field identifying a source having sent the information signal, a storage information field indicative of an amount of data of the information signal stored, a field storing the information signal, and a storage field storing error control data of the channel packet,

each of the destination information field, the source information field, the storage information field and the storage field being variable in size.

4. The access point in accordance with claim 1, wherein the channel packet for voice comprises a field storing frame synchronization information of the channel packet, a destination information field identifying a destination of the information signal, a source information field identifying a source sent the information signal, a storage field storing the information field, and a storage field storing error control data of the channel packet,

each of the destination information field, the source information field and the storage fields being fixed in size.

5. The access point in accordance with claim 1, wherein said access point further comprises a connecting circuit for connecting said access point to a radio access apparatus.

6. The access point in accordance with claim 1, wherein said access point is operable in a TDD (Time Division Duplex) mode particular to an IMT-2000 system.

7. The access point in accordance with claim 1, further comprising an interface for connecting said access point to a wired LAN.

8. A wireless station for use in a limited service area of a radio LAN (Local Area Network), said station comprising:

a transmitter for spreading an information signal in a direct spread spectrum system, which spreads a frequency band width of the information signal, and transmitting a spread information signal; and

a receiver for receiving the spread information signal and inversely spreading said spread information signal;

said transmitter comprising;

a plurality of information transmitting circuits each for multiplying, in the direct spread spectrum system, the information signal and a particular one of a plurality of spread codes; and

a transmission controller for selecting, in accordance with at least one of a kind and an amount of the information signal, one of a plurality of frequency bands and frequencies respectively assigned to said plurality of information transmitting circuits and one of a plurality of packets to use for transmission of the information signal, and maintaining transmission power of the spread information signal semi-fixed,

wherein the kind of the information signal is any one of a control packet sent from said station to an access point, a channel packet for data and a channel packet for voice.

9. The wireless station in accordance with claim 8, wherein the control packet comprises a field storing frame synchronization information of the control packet, an information field identifying said station, a field storing error control data of the second control packet, and a control information field indicative of various kinds of request control,

said control information field storing location confirmation acknowledgement information for answering the location confirmation request information, registration acknowledgement information for answering the registration request information when said station newly enters the service area, call acknowledgement information for answering the call request information, communication request information for requesting communication with said access point, and report information indicative of channel release.

10. The wireless station in accordance with claim 8, wherein the channel packet for data comprises a field storing frame synchronization information of the channel packet, a destination information field identifying a destination of the information signal, a source information field identifying a source having sent the information signal, a storage information field indicative of an amount of data of the information signal stored, a field storing the information signal, and a storage field storing error control data of the channel packet,

each of the destination information field, the source information field, the storage information field and the storage field being variable in size.

11. The wireless station in accordance with claim 8, wherein the channel packet for voice comprises a field storing frame synchronization information of the channel packet, a destination information field identifying a destination of the information signal, a source information field identifying a source sent the information signal, a storage field storing the information field, and a storage field storing error control data of the channel packet,

each of the destination information field, the source information field and the storage fields being fixed in size.

12. The wireless station in accordance with claim 8, wherein said station is operable in a TDD (Time Division Duplex) mode particular to an IMT-2000 system.

13. The wireless station in accordance with claim 8, further comprising an interfacing circuit for connecting said station to either one of a public switched telephone network and a terminal configured, to process the information signal.

14. A radio LAN (Local Area Network) system comprising an access point forming a limited service area and a station present in the limited service area for transmitting by radio an information signal between the access point and the station within the service area:

each of said access point and said station comprising;

a transmitter for spreading the information signal in a direct spread spectrum system, which spreads a frequency band width of the information signal, and transmitting a spread information signal; and

a receiver for receiving the spread information signal and inversely spreading said spread information signal;

said transmitter comprising;

a plurality of information transmitting circuits each for multiplying, in the direct spread spectrum system, the information signal and a particular one of a plurality of spread codes; and

a transmission controller maintaining transmission power of the spread information signal at a level that guarantees a minimum value of received field strength without exceeding an upper limit of transmission power and without limiting transmission power in any individual one of said plurality of information transmitting circuits,

wherein a kind of the information signal is any one of a control packet sent from said station to said access point, a channel packet for data and a channel packet for voice.

15. The system in accordance with claim 14, wherein said access point further comprises a connecting circuit for connecting said access point to a radio access apparatus.

16. The system in accordance with claim 14, wherein said access point and said station each are operable in a TDD (Time Division Duplex) mode particular to an IMT-2000 system.

17. The system in accordance with claim 14,

said access point further comprising a first interface for connecting said access point to a wired LAN.

18. The system in accordance with claim 14,

said station further comprising a second interfacing circuit for connecting said station to either one of a public switched telephone network and a terminal configured to process the information signal.