Transmittal of heartbeat signal at a lower level than heartbeat request

• US 8,134,980 B2
• Filed: 05/22/2007
• Issued: 03/13/2012
• Est. Priority Date: 06/01/1998
• Status: Expired due to Term

• Current Assignee: Apple Inc.
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Proctor, James A. Jr.
• Primary Examiner(s): Qureshi, Afsar M.
• Application Number:
  US11/805,013
• Publication Number:
  US 20070223426A1
• Time in Patent Office: 1,757 Days
• Field of Search: 370200-522, 375130-272, 455409-445, 455/509, 709203-224
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04L 1/165 Variable formats
• CPC Class Codes: H04L 25/14 Channel dividing arrangements , i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 7/06 the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/1327 Release and resetting of connection
• CPC Class Codes: H04Q 2213/13298 Local loop systems, access network
• CPC Class Codes: H04Q 2213/13332 Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04Q 2213/1336 Synchronisation
• CPC Class Codes: H04Q 2213/13389 LAN, internet
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/325 : Power control of control or pilot channels
• CPC Class Codes: H04W 52/50 : at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/04 : Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 74/0866 : using a dedicated channel for access
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 8/005 : Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/02 : Terminal devices

Abstract

A communication system, such as a wireless CDMA system, detects markers with fewer errors by having field units transmit the markers at different power levels (e.g., 9 dB for one marker and 11 dB for another marker). The difference in power levels of the markers allows the base station to identify the request markers using alternative criteria with a low probability of error, where the alternative criteria may include comparing the markers to respective energy level thresholds, monitoring occupancy of time slots, occupancy of mutually exclusive code channels, or combinations thereof. For example, in one particular embodiment, a request marker, which is generally a high priority marker, is transmitted with higher power, which improves the probability of detection and reduces the probability of false detection of the request marker.

Claims

1. A code division multiple access (CDMA) user device comprising:

an antenna;

a controller configured to control a CDMA transceiver such that a connection with a network is established; and

the controller further configured to control the CDMA transceiver to transmit a signal of a first type including pilot information having a first orthogonal code from the CDMA user device over a reverse link, and transmit a signal of a second type having a second orthogonal code in a at least one slot from the CDMA user device over the reverse link requesting that a base station provide additional resources associated with a reverse link traffic channel, wherein the reverse link traffic channel includes a plurality of channels having respective orthogonal codes that are divided in time into intervals, wherein the intervals are subdivided into slots.

2. The CDMA user device according to claim 1 wherein the CDMA transceiver is configured to transmit the signal of the first type and the signal of the second type at different power levels.

3. The CDMA user device according to claim 1 wherein the signal of the second type indicates the request that the base station provide additional resources by using a single bit in the signal of the second type.

4. The CDMA user device according to claim 1 wherein the controller is further configured to receive information and the signal of the first type is transmitted in slots derived from the received information and not in other slots of the time interval.

5. The CDMA user device according to claim 4 wherein the signal of the first type maintains timing between the CDMA user device and the base station.

6. The CDMA user device according to claim 4 wherein the signal of the first type maintains power control between the CDMA user device and the base station.

7. The CDMA user device according to claim 1 wherein each of the plurality of channels of the reverse link traffic channel supports variable data rates.

8. A method performed by a code division multiple access (CDMA) user device comprising:

establishing, by the CDMA user device, a connection with a network; and

transmitting, by the CDMA user device, a signal of a first type, a second type and a reverse link traffic channel;

wherein the signal of the first type includes pilot information and having a first orthogonal code, wherein the signal of the second type having a second orthogonal code in a at least one slot from the CDMA user device over the reverse link requesting that a base station provide additional resources associated with a reverse link traffic channel, wherein the reverse link traffic channel includes a plurality of channels having respective orthogonal codes that are divided in time into intervals, wherein the intervals are subdivided into slots.

9. The method according to claim 8 wherein the signal of the first type and the signal of the second type are transmitted at different power levels.

10. The method according to claim 8 wherein the signal of the second type indicates the request that the base station provide additional resources by using a single bit in the signal of the second type.

11. The method according to claim 8 further comprising receiving information;

wherein the signal of the first type is transmitted in slots derived from the received information and not in other slots of the time interval.

12. The method according to claim 11 wherein the signal of the first type maintains timing between the CDMA user device and the base station.

13. The method according to claim 12 wherein the signal of the first type maintains power control between the CDMA user device and the base station.

14. The method according to claim 12 wherein each of the plurality of channels of the reverse link traffic channel supports variable data rates.

15. A code division multiple access (CDMA) base station and network comprising:

transmit and receive components configured to establish a connection with a user device;

wherein the transmit and receive components are configured to receive a signal of a first type, a second type and a reverse link traffic channel from the CDMA user device;

wherein the signal of the first type includes pilot information and having a first orthogonal code, wherein the signal of the second type having a second orthogonal code over the reverse link requesting that a base station provide additional resources associated with a reverse link traffic channel and being received in at least one time slot, wherein the reverse link traffic channel includes a plurality of channels having respective orthogonal codes that are divided in time into intervals, wherein the intervals are subdivided into slots.

16. The CDMA base station and network according to claim 15 wherein the signal of the second type indicates the request that the base station provide additional resources is by using a single bit in the signal of the second type.

17. The CDMA base station and network according to claim 15 further comprising transmitting information from the CDMA base station indicating slots that the signal of the first type is to be transmitted.

18. The CDMA base station and network according to claim 17 wherein the signal of the first type maintains timing between the CDMA user device and the base station.

19. The CDMA base station and network according to claim 18 wherein the signal of the first type maintains power control between the CDMA user device and the base station.