Methods for detection of failure and recovery in a radio link

• US 9,451,567 B2
• Filed: 07/30/2013
• Issued: 09/20/2016
• Est. Priority Date: 08/08/2008
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Krishnamurthy, Sandeep H., Buckley, Michael Eoin, Kuchibhotla, Ravi, Love, Robert T., Nory, Ravikiran
• Primary Examiner(s): WANG, TED M
• Application Number:
  US13/953,889
• Publication Number:
  US 20130315358A1
• Time in Patent Office: 1,148 Days
• Field of Search: 375/354, 375/356, 375/357
• US Class Current: 1/1
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

A method, telecommunication apparatus, and electronic device for detecting a status of a radio link are disclosed. A transceiver 302 may maintain a radio link with a network base station 104. A processor 304 may map channel state information to a synchronization status associated with the radio link based on the received signal and determine the synchronization status via a block error rate estimate in the radio link based on the channel state information.

Claims

1. A method for a telecommunications apparatus to detect a status of a radio link between the telecommunications apparatus and a base station, the method comprising:

receiving, by the telecommunications apparatus, an electronic reference signal transmitted wirelessly from the base station to the telecommunications apparatus;

using a processor of the telecommunications apparatus to determine a synchronization status of the radio link based on the received reference signal and an assumption that a codeword of a first payload type has been transmitted from the base station to the telecommunications apparatus;

estimating, from the received reference signal, a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a recovery format;

determining if the radio link has an in synchronization event if the metric is within a recovery range; and

setting the recovery range based upon at least one payload parameter.

2. The method of claim 1 wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level, or power boost.

3. The method of claim 2 wherein the payload corresponds to a physical downlink control channel format 1C.

4. A method for a telecommunications apparatus to detect a status of a radio link between the telecommunications apparatus and a base station, the method comprising:

receiving, by the telecommunications apparatus, an electronic reference signal transmitted wirelessly from the base station to the telecommunications apparatus; and

using a processor of the telecommunications apparatus to determine a synchronization status of the radio link based on the received reference signal and an assumption that a codeword of a first payload type has been transmitted from the base station to the telecommunications apparatus;

estimating, from the received reference signal, a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a failure format;

determining if the radio link has an out-of-synchronization event if the metric is within a failure range; and

setting the failure range based upon at least one payload parameter,

wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level, or power boost, and wherein the payload corresponds to a physical downlink control channel format 1A.

5. A method for a telecommunications apparatus to detect a status of a radio link between the telecommunications apparatus and a base station, the method comprising:

receiving, by the telecommunications apparatus, an electronic reference signal transmitted wirelessly from the base station to the telecommunications apparatus; and

using a processor of the telecommunications apparatus to determine a synchronization status of the radio link based on the received reference signal and an assumption that a codeword of a first payload type has been transmitted from the base station to the telecommunications apparatus;

estimating, from the received reference signal, a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a failure format;

determining if the radio link has an out-of-synchronization event if the metric is within a failure range; and

setting the failure range based upon at least one payload parameter,

wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level, or power boost, and wherein the specific transmission format is one of a downlink control information 1A or a downlink control information 1C.