Multi-detection of heartbeat to reduce error probability

• US 9,042,400 B2
• Filed: 06/30/2008
• Issued: 05/26/2015
• Est. Priority Date: 12/17/1997
• Status: Expired due to Fees

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Proctor, James A. Jr.
• Primary Examiner(s): Pham, Brenda H
• Application Number:
  US12/165,422
• Publication Number:
  US 20090086680A1
• Time in Patent Office: 2,521 Days
• Field of Search: 370/314, 370/321, 370/252, 370/280, 370/282, 455/407, 455/425, 455/73
• US Class Current: 370/458
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• 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 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• 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 28/04 : Error control
• CPC Class Codes: H04W 28/18 : Negotiating wireless communication parameters
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/004 : in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/04 : Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 : Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

A communications system improves performance of detecting a signal having an indication of a request to change communications states by making at least two positive identifications of the request in a given time frame. The system may further improve performance by applying a difference in power levels for a non-request state (i.e., steady state or ‘control hold’ state) versus a request state (i.e., ‘request to change’ state). In one particular application, a base station determines a request to change communications states with a reasonably high probability of detection and a reasonably low probability of false detection. The system has a reduced number of erroneous communications states, such as erroneous traffic channel allocations. The detection technique is compatible with 1xEV-DV systems and I-CDMA systems, but general enough to support systems employing various other communications protocols used in wired and wireless communications systems.

Claims

1. A wireless user device comprising:

circuitry configured to transmit signals having different formats in time intervals to a base station;

wherein each time interval includes at least one slot;

wherein at least one of the different formats is configured to include an indication that the wireless user device is requesting resources to transmit user data;

wherein in the time intervals that the signals are transmitted no user data is transmitted;

wherein at least two of the different formats are associated with a different power offsets;

wherein the circuitry is configured to receive information indicating resources to transmit user data in response to transmitting the indication requesting resources; and

wherein the wireless user device is assigned an orthogonal sequence and the transmitted signals are derived at least from the orthogonal sequence.

2. The wireless user device of claim 1 wherein other user devices are assigned other orthogonal sequences.

3. The wireless user device of claim 1 wherein the transmitted signals are further derived from a pseudo noise sequence.

4. The wireless user device of claim 1 wherein the requesting resources indication is repeated until the information indicating user data transmission resources is received.

5. The wireless user device of claim 1 wherein the signals are not transmitted in an access procedure.

6. A method of wireless communications comprising:

transmitting signals having different formats in time intervals to a base station;

wherein each time interval includes at least one slot;

wherein at least one of the different formats is configured to include an indication that the wireless user device is requesting resources to transmit user data;

wherein in the time intervals that the signals are transmitted no user data is transmitted;

wherein at least two of the different formats are associated with a different power offset;

wherein the wireless user device is configured to receive information indicating resources to transmit user data in a response to transmitting the indication requesting resources; and

wherein the wireless user device is assigned an orthogonal sequence and the transmitted signals are derived at least from the orthogonal sequence.

7. The method of claim 6 wherein other user devices are assigned other orthogonal sequences.

8. The method of claim 6 wherein the transmitted signals are further derived from a pseudo noise sequence.

9. The method of claim 6 wherein the requesting resources indication is repeated until the information indicating user data transmission resources is received.

10. The method of claim 6 wherein the signals are not transmitted in an access procedure.