Communication system

• US 6,993,049 B2
• Filed: 06/07/2001
• Issued: 01/31/2006
• Est. Priority Date: 06/26/2000
• Status: Expired due to Term

• Current Assignee: Uniloc 2017 LLC (SoftBank Group Corp.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Davies, Robert J.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): ABELSON, RONALD B
• Application Number:
  US09/876,514
• Publication Number:
  US 20020028657A1
• Time in Patent Office: 1,699 Days
• Field of Search: 370/311, 370/312, 370328-330, 370/336, 370/337, 370/346, 370/347, 370/350, 370/390, 370/465, 370/470, 370/473, 370/476, 370/491, 370/528, 370/449
• US Class Current: 370/528
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04W 74/06 using polling
• CPC Class Codes: H04W 84/00 Network topologies

Abstract

A communications system comprises a primary station (100) and at least one secondary station (101). The primary station (100) is arranged to broadcast a series of inquiry messages, each in the form of a plurality of predetermined data fields arranged according to a first communications protocol such as Bluetooth. In addition the primary station (100) adds to some or all of the inquiry messages an additional data field for polling one or more secondary stations, which can respond to the poll if they have data for transmission. This system provides secondary stations (101) with a rapid response time without the need for a permanently active communication link.

Claims

1. A communications system comprising a primary station and at least one secondary station, wherein the primary station has means for broadcasting a series of inquiry messages, each in the form of a plurality of predetermined data fields arranged according to a first communications protocol, and means for adding to an inquiry message prior to transmission an additional data field for polling at least one secondary station, and wherein the at least one polled secondary station has means for determining when an additional data field has been added to the plurality of data fields, for determining whether it has been polled from the additional data field and for responding to a poll when it has data for transmission to the primary station.

2. A primary station for use in a communications system comprising at least one secondary station, wherein means are provided for broadcasting a series of inquiry messages, each in the form of a plurality of predetermined data fields arranged according to a first communications protocol, and for adding to each inquiry message prior to transmission an additional data field for polling at least one secondary station.

3. The primary station of claim 2, wherein means are provided for adding the additional data field at the end of a respective inquiry message.

4. The primary station of claim 2, wherein means are provided for including an indication in one of the predetermined data fields, the indication denoting the presence of the additional data field.

5. The primary station of claim 2, wherein the first communications protocol comprises Bluetooth messaging.

6. The primary station of claim 2, wherein the additional data field comprises at least 64 bits of data.

7. The primary station of claim 2, wherein first radio means are provided for broadcasting substantially continuously inquiry messages having the additional data field and second radio means are provided for handling other aspects of communication links with secondary stations.

8. A secondary station for use in a communications system comprising a primary station, wherein means are provided for receiving an inquiry message broadcast by the primary station, the message being in the form of a plurality of predetermined data fields arranged according to a first communications protocol and having added to it an additional data field for polling at least one secondary station, and wherein means are provided for determining when an additional data field has been added to the plurality of data fields, for determining whether it has been polled from the additional data field and for responding to a poll when it has data for transmission to the primary station.

9. The secondary station of claim 8, wherein the first communications protocol comprises Bluetooth messaging.

10. The secondary station of claim 8, wherein means are provided for responding to a poll after a predetermined interval has passed without transmission of data, whether or not the secondary station has data for transmission.

11. A method of operating a communication system comprising a primary station and at least one secondary station, the method comprising the primary station broadcasting a series of inquiry messages, each in the form of a plurality of predetermined data fields arranged according to a first communications protocol, and adding to an inquiry message prior to transmission an additional data field for polling at least one secondary station, and further comprising the at least one polled secondary station determining when an additional data field has been added to the plurality of data fields, determining whether it has been polled from the additional data field and responding to a poll when it has data for transmission to the primary station.

12. The method of claim 11, wherein not all inquiry messages have an additional data field for polling a secondary station added to them.