Multi-detection of heartbeat to reduce error probability

• US 9,525,923 B2
• Filed: 07/08/2014
• Issued: 12/20/2016
• Est. Priority Date: 12/17/1997
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Proctor, James A. Jr.
• Primary Examiner(s): Pham, Brenda H
• Application Number:
  US14/325,756
• Publication Number:
  US 20140321441A1
• Time in Patent Office: 896 Days
• Field of Search: 370/235, 370/230, 370/229, 370/232, 370/233, 370/234, 370/235.1
• US Class Current: 1/1
• 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 76/27 : Transitions between radio resource control [RRC] states
• 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 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;

wherein the first indication has a first energy level and further wherein the second indication has a second energy level;

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 and based further on a difference in energy levels of the first and second indications.

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 not shared in time and do not overlap and when a when a heartbeat signal of the WTRU is at a logical zero.

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;

wherein the first indication has a first energy level and further wherein the second indication has a second energy level;

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, via a counter, at least one of the detected first or second indications and storing a count; and

determining, via a processor coupled to the counter, whether a request to change communications states has been performed based on the counting and based further on a difference in energy levels of the first and second indications.

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 not shared in time and do not overlap and when a when a heartbeat signal of the WTRU is at a logical zero.

13. The method of claim 7, further comprising:

determining at a base station whether the WTRU is making a request to go active.

14. The method of claim 13, wherein determining the WTRU is making the request to go active is based upon a measurement comprising one or more of counting a number of consecutive request signals, measuring a ratio of heartbeat standby channel signals and heartbeat request active channel signals, counting heartbeat request active signals in a given time span, and comparing a difference in the energy levels against a threshold.

15. The method of claim 14, wherein the threshold is based on an expected or specified number of “

I”

bits used to indicate a request to go active or an expected or specified number of “

I”

bits used to indicate a request to remain in idle mode.

16. The method of claim 13, wherein determining the WTRU is making the request to go active is based on the counter exceeding a threshold, wherein a state machine at the base station reports a detection of a request to go active from the WTRU when the counter exceeds the threshold and wherein the state machine waits to receive further data when the counter does not exceed the threshold.

17. The method of claim 13, wherein determining the WTRU is making the request to go active is based on how many indications of a request to go active have been received according to specified criteria comprising any one of:

a number of consecutive detections of a request to go active, a number of detections of a request to go active in a specified time span, and a ratio of detections of a request to go active to non-detections of a request to go active.

18. The method of claim 7, wherein the difference in energy levels of the first and second indications is based on a transmitted power level as reported by the WTRU to a base station over a heartbeat standby channel.

19. The method of claim 18, wherein an energy level calculation and comparison is performed to determine the difference in energy levels of the first and second indications, wherein the first and second energy levels is dependent on occupancy of time slots in signaling channels used by the at least one signal.