Intermittent shutoff of RF circuitry in wireless communication terminals

• US 9,265,004 B2
• Filed: 01/25/2012
• Issued: 02/16/2016
• Est. Priority Date: 02/02/2011
• Status: Active Grant

• Current Assignee: Sony Semiconductor Solutions Corporation (Sony Group Corp.)
• Original Assignee: Altair Semiconductor Ltd. (Sony Group Corp.)
• Inventors: Almog, Edan, Bitran, Yigal
• Primary Examiner(s): Jiang, Charles C
• Assistant Examiner(s): Atkins, Jr., George
• Application Number:
  US13/978,147
• Publication Number:
  US 20130301508A1
• Time in Patent Office: 1,483 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/028 switching on or off only a part of the equipment circuit blocks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for communication in a receiver (20) includes receiving over a wireless communication channel a signal that carries at least a control channel. A first estimate of a response of the wireless communication channel is computed using a first estimation process having a first latency, and the control channel is decoded based on the first estimate. Upon identifying, based on the decoded control channel, a time period during which no data channel is to be addressed to the receiver, circuitry (24) of the receiver is shut down for at least part of the identified time period. A second estimate of the response is computed using a second estimation process having a second latency, higher than the first latency, and a data channel that is addressed to the receiver is decoded based on the second estimate.

Claims

1. A method for communication, comprising:

in a receiver, receiving over a wireless communication channel a signal that carries at least a sequence of reference signals and a control channel;

computing a first estimate of a response of the wireless communication channel using a first estimation process that estimates the response based on reference signals received over a first time interval of the sequence of the reference signals, and decoding the control channel based on the first estimate;

upon identifying, based on the decoded control channel, a time period during which no data channel is to be addressed to the receiver, shutting down circuitry of the receiver for at least part of the identified time period; and

computing a second estimate of the response using a second estimation process that estimates the response based on reference signals received over a second time interval of the same sequence of the reference signals, longer than the first time interval, and decoding a data channel that is addressed to the receiver based on the second estimate.

2. The method according to claim 1, wherein the first estimation process comprises a causal estimation process that estimates the response for a given time using only one or more reference signals that are no later than the given time, and wherein the second estimation process comprises a non-causal estimation process that estimates the response using at least one reference signal that is subsequent to the given time.

3. The method according to claim 1, wherein the first estimation process estimates the response for a given time using one or more reference signals in the first time interval following the given time, and wherein the second estimation process estimates the response for the given time using at least one reference signal in the second time interval following the given time.

4. The method according to claim 1, wherein the first estimation process has a first processing delay, and wherein the second estimation process a second processing delay, larger than the first processing delay.

5. The method according to claim 1, wherein identifying the time period comprises detecting that the control channel conveys an allocation for the data channel addressed to the receiver, and selecting the time period so as to fall outside the allocation.

6. The method according to claim 1, wherein the received signal conforms to a Long Term Evolution (LTE) specification, wherein the control channel comprises a Physical Downlink Control Channel (PDCCH), and wherein the data channel comprises a Physical Downlink Shared Channels (PDSCH).

7. A communication apparatus, comprising:

a receiver, which is configured to receive over a wireless communication channel a signal that carries at least a sequence of reference signals and a control channel; and

processing circuitry, which is configured to compute a first estimate of a response of the wireless communication channel using a first estimation process that estimates the response based on reference signals received over a first time interval of the sequence of the reference signals, to decode the control channel based on the first estimate, to shut-down, upon identifying based on the decoded control channel a time period during which no data channel is to be addressed to the receiver, circuitry of the receiver for at least part of the identified time period, to compute a second estimate of the response using a second estimation process that estimates the response based on reference signals received over a second time interval of the same sequence of the reference signals, longer than the first time interval, and to decode a data channel that is addressed to the receiver based on the second estimate.

8. A method for communication, comprising:

in a receiver, receiving a signal that carries a sequence of frames, each frame comprising at least a control channel followed by a data zone;

decoding the received signal out-of-order, such that decoding of the control channel of a second frame in the same single sequence of the frames begins before a data channel in the data zone of a first frame in the same single sequence, which precedes the second frame in the same single sequence, is fully decoded, even though the data channel in the first frame precedes the control channel in the second frame;

identifying, based on the decoded control channel of the second frame, a time period during which no data is to be addressed to the receiver in the data zone of the second frame; and

shutting down Radio-Frequency (RF) circuitry of the receiver for at least part of the identified time period.

9. The method according to claim 8, wherein decoding the received signal comprises decoding the control channel and the data channel using respective, independent first and second decoders.

10. The method according to claim 8, wherein decoding the received signal comprises sharing a processing resource between decoding of the control channel and decoding of the data channel, and prioritizing assignment of the shared processing resource such that decoding of the control channel of the second frame begins before the data channel of the first frame is fully decoded.

11. The method according to claim 8, wherein identifying the time period comprises detecting that the control channel of the second frame does not contain a data channel allocation addressed to the receiver.

12. The method according to claim 8, wherein identifying the time period comprises detecting that the control channel of the second frame conveys a data channel allocation addressed to the receiver, and selecting the time period so as to fall outside the data channel allocation.

13. The method according to claim 8, wherein the received signal conforms to a Long Term Evolution (LTE) specification, wherein the control channel comprises a Physical Downlink Control Channel (PDCCH), and wherein the data channel comprises a Physical Downlink Shared Channel (PDSCH).

14. A communication apparatus, comprising:

a receiver, which is configured to receive a signal that carries a sequence of frames, each frame comprising at least a control channel followed by a data zone; and

processing circuitry, which is configured to decode the received signal out-of-order, such that decoding of the control channel of a second frame in the same single sequence of the frames begins before a data channel in the data zone of a first frame in the same single sequence, which precedes the second frame in the same single sequence, is fully decoded, even though the data channel in the first frame precedes the control channel in the second frame, to identify, based on the decoded control channel of the second frame, a time period during which no data is to be addressed to the apparatus in the data zone of the second frame, and to shut down Radio-Frequency (RF) circuitry of the receiver for at least part of the identified time period.