MULTI-DETECTION OF HEARTBEAT TO REDUCE ERROR PROBABILITY

• US 20090086680A1
• Filed: 06/30/2008
• Published: 04/02/2009
• Est. Priority Date: 12/17/1997
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Tantivy Communications Incorporated (InterDigital, Inc.)
• Inventors: Proctor, James A. JR.
• Granted Patent: US 9,042,400 B2
• Time in Patent Office: Days
• US Class Current: 370/332
• 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 1×EV-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 transmit receive unit (WTRU) comprising:

a receiver configured to receive at least one signal having a first indication of a first communications state, and a second indication for a request to change to a second communications state;

at least one monitor configured to monitor at least one first time slot for detecting the first indication, and at least one second time slot for detecting the second indication;

a counter coupled to the at least one monitor configured to count at least one of the detected first or second indications; and

a processor coupled to the counter configured to determine whether a request to change communications states has been performed based on the counting.

2. The WTRU of claim 1 wherein the processor is further configured to compare a number of counted detected second indications against a threshold of at least two detected second indications.

3. The WTRU of claim 1 wherein the counter is further configured to reset if non-consecutively detected first indications or non-consecutively detected second indications are received in the at least one signal.

4. The WTRU of claim 3 wherein the counter is further configured to reset if the threshold of at least two detected second indications is not achieved in a given time span.

5. The WTRU of claim 1 wherein the at least one monitor is configured to measure the at least one signal in the at least one first and second time slots, and to compare results thereof to first and second thresholds for detecting the first and second indications.

6. The WTRU of claim 1 wherein the first and second time slots are mutually exclusive.

7. A method for use in a wireless transmit receive unit (WTRU), the method comprising:

receiving at least one signal having a first indication of a first communications state, and a second indication for a request to change to a second communications state;

monitoring at least one first time slot for detecting the first indication, and at least one second time slot for detecting the second indication;

counting at least one of the detected first or second indications and storing a count; and

determining whether a request to change communications states has been performed based on the counting.

8. The method of claim 7 further comprising:

comparing a number of counted detected second indications against a threshold of at least two detected second indications.

9. The method of claim 7 further comprising:

resetting the count if non-consecutively detected first indications or non-consecutively detected second indications are received in the at least one signal.

10. The method of claim 9 further comprising:

resetting the count if the threshold of at least two detected second indications is not achieved in a given time span.

11. The method of claim 7 further comprising:

measuring the at least one signal in the at least one first and second time slots; and

comparing results thereof to first and second thresholds for detecting the first and second indications.

12. The method of claim 7 wherein the first and second time slots are mutually exclusive.