Coexistence of plural wireless communication transceivers in close proximity

• US 8,855,570 B2
• Filed: 12/02/2009
• Issued: 10/07/2014
• Est. Priority Date: 02/05/2009
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Wilhelmsson, Leif
• Primary Examiner(s): Ghebretinsae, Temesgh
• Assistant Examiner(s): TALUKDER, MD K
• Application Number:
  US12/629,164
• Publication Number:
  US 20100197235A1
• Time in Patent Office: 1,770 Days
• Field of Search: 455/41.2, 455/63.1, 455/63.3, 455/552.1, 455/552.2, 455/448, 455/450, 455/452.2, 455/509, 455/556.2, 455/574, 455/63.2, 455/66.1, 370/461, 370/506, 370/445, 370/343
• US Class Current: 455/63.3
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A communication device has a plurality of concurrently operating transceivers, each operating in a respectively different one of a plurality of communication systems, wherein the plurality of concurrently operating transceivers includes a first transceiver and a second transceiver. Operation of the communication device includes the first transceiver ascertaining whether transmissions by the second transceiver are causing interference in a receiver of the first transceiver and if so, performing one or more interference response actions. The one or more interference response actions include ascertaining whether the interference is at an acceptable level and if so then taking no further interference response actions. If the interference is ascertained to be at an unacceptable level, an interference mitigation request is communicated to the second transceiver. The second transceiver can, for example, shift its use of frequencies to a region whereby the first transceiver'"'"'s band select filter can sufficiently attenuate the second transceiver'"'"'s signal.

Claims

1. A method of operating a communication device having a plurality of concurrently operating transceivers, each operating in a respectively different one of a plurality of communication systems, wherein the plurality of concurrently operating transceivers includes a first transceiver and a second transceiver, the method comprising:

the first transceiver ascertaining whether transmissions by the second transceiver are causing interference in a receiver of the first transceiver and if so, performing one or more interference response actions,

wherein the one or more interference response actions include;

ascertaining whether the interference is at an acceptable level and if so then taking no further interference response actions; and

if the interference is ascertained to be at an unacceptable level, then communicating an interference mitigation request to the second transceiver,

wherein;

the second transceiver is operating on a first frequency in a first frequency band;

the first transceiver is operating in a second frequency band that is different from the first frequency band;

the first frequency band partially overlaps with at least one of a passband and a transition band of a band select filter of the first transceiver'"'"'s receiver;

the interference mitigation request includes a request for the second transceiver to cease operating on the first frequency in the first frequency band and instead to operate on a second frequency;

the request for the second transceiver to cease operating on the first frequency in the first frequency band and instead to operate on the second frequency is a request for the second transceiver to cease operating on the first frequency in the first frequency band and instead to operate on a second frequency in the first frequency band that is more attenuated by the band select filter of the first transceiver'"'"'s receiver than the first frequency is; and

the method further comprises ascertaining an amount by which the second frequency can be permitted to lie outside a stop band of the first transceiver'"'"'s receiver'"'"'s band select filter while maintaining a level of receiver performance above a predetermined threshold, wherein the second frequency lies no farther outside the stop band of the first transceiver'"'"'s receiver'"'"'s band select filter than the ascertained amount.

2. The method of claim 1, comprising:

the first transceiver receiving information about a power level used by the second transceiver'"'"'s transmissions; and

the first transceiver utilizing the information about the power level used by the second transceiver'"'"'s transmissions in a process of ascertaining the amount by which the second frequency can be permitted to lie outside the stop band of the first transceiver'"'"'s receiver'"'"'s band select filter while maintaining a level of receiver performance above a predetermined threshold.

3. The method of claim 1, wherein the interference mitigation request includes a request for the second transceiver to reduce a second transceiver transmission power level.

4. An apparatus for operating a communication device having a plurality of concurrently operating transceivers, each operating in a respectively different one of a plurality of communication systems, wherein the plurality of concurrently operating transceivers includes a first transceiver and a second transceiver, the apparatus comprising:

circuitry associated with the first transceiver and configured to ascertain whether transmissions by the second transceiver are causing interference in a receiver of the first transceiver and if so, to perform one or more interference response actions,

wherein the one or more interference response actions include;

ascertaining whether the interference is at an acceptable level and if so then taking no further interference response actions; and

if the interference is ascertained to be at an unacceptable level, then communicating an interference mitigation request to the second transceiver,

wherein;

the second transceiver is configured to operate on any of a plurality of frequencies including a first frequency in a first frequency band;

the first transceiver is operating in a second frequency band that is different from the first frequency band;

the first frequency band partially overlaps with at least one of a passband and a transition band of a band select filter of the first transceiver'"'"'s receiver;

the interference mitigation request includes a request for the second transceiver to cease operating on the first frequency in the first frequency band and instead to operate on a second frequency;

the request for the second transceiver to cease operating on the first frequency in the first frequency band and instead to operate on the second frequency is a request for the second transceiver to cease operating on the first frequency in the first frequency band and instead to operate on a second frequency in the first frequency band that is more attenuated by the band select filter of the first transceiver'"'"'s receiver than the first frequency is; and

the apparatus further comprises circuitry associated with the first transceiver and configured to ascertain an amount by which the second frequency can be permitted to lie outside a stop band of the first transceiver'"'"'s receiver'"'"'s band select filter while maintaining a level of receiver performance above a predetermined threshold, wherein the second frequency lies no farther outside the stop band of the first transceiver'"'"'s receiver'"'"'s band select filter than the ascertained amount.

5. The apparatus of claim 4, comprising:

circuitry associated with the first transceiver and configured to receive information about a power level used by the second transceiver'"'"'s transmissions; and

circuitry associated with the first transceiver and configured to utilize the information about the power level used by the second transceiver'"'"'s transmissions in a process of ascertaining the amount by which the second frequency can be permitted to lie outside the stop band of the first transceiver'"'"'s receiver'"'"'s band select filter while maintaining a level of receiver performance above a predetermined threshold.

6. The apparatus of claim 4, wherein the interference mitigation request includes a request for the second transceiver to reduce a second transceiver transmission power level.

7. The apparatus of claim 4, comprising

the second transceiver;

circuitry associated with the second transceiver and configured to receive the interference mitigation request and in response thereto, to perform one or more interference mitigation actions.