Reducing the effects of interference experienced by a communication device

• US 9,510,328 B2
• Filed: 04/24/2013
• Issued: 11/29/2016
• Est. Priority Date: 05/25/2012
• 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., Jung, Hyejung, Narasimha, Murali, Nory, Ravikiran
• Primary Examiner(s): Wu, Jianye
• Application Number:
  US13/869,084
• Publication Number:
  US 20130315157A1
• Time in Patent Office: 1,315 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 36/0083 Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 68/06 using multi-step notification by changing the notification area
• CPC Class Codes: H04W 68/08 using multi-step notification by increasing the notification area
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Disclosed are methods for allowing a wireless communication device (or “user equipment” or “UE”) to receive signaling information when there is a power imbalance between a primary cell (“Pcell”) and a New Carrier Type (“NCT”) secondary cell (“Scell”). In one aspect, the UE reduces its downlink bandwidth to cover only a carrier of the Pcell, receives control signaling information, if present, and then increases its bandwidth to cover carriers of both the Pcell and Scell.

Claims

1. A method for receiving control signaling from a first cell operating on a first carrier when configured with at least the first carrier and a second carrier, the method comprising:

operating on a first bandwidth that includes the first carrier and the second carrier;

receiving scheduling information associated with a periodicity and a gap duration;

identifying a paging occasion where the first bandwidth may be reduced to a second bandwidth;

reducing bandwidth, based on the identified paging occasion, for the identified gap duration in each period of the periodicity, to a second bandwidth, the second bandwidth including the first carrier;

increasing bandwidth, after the identified gap duration, to the first bandwidth; and

first bandwidth, wherein each time instant of the second sequence follows a

receiving control signaling from the first cell in frames occurring during the gap duration.

2. The method of claim 1 further comprising:

receiving neither the signals on the first carrier nor the signals on the second carrier during a period immediately preceding the period of the identified periodicity; and

receiving neither the signals on the first carrier nor the signals on the second carrier during a period immediately following the identified gap duration.

3. The method of claim 1 wherein the control channel is selected from the group consisting of:

paging channel, SI-x, and PBCH.

4. The method of claim 1 further comprising:

receiving a paging signal indicating a system change notification; and

reducing the bandwidth to the second bandwidth in response to receiving the system change notification.

5. A method in a UE, the method comprising:

identifying a paging occasion where a first bandwidth may be reduced to a second bandwidth;

receiving scheduling information associated with a periodicity and gap duration of a transition from a first set of subframes to a second set of subframes;

receiving the first set of subframes and the second set of subframes, wherein;

(i) a transition from the first set of subframes to the second set of subrames occurs at the periodicity of transition from the first set of subframes to the second set of subframes;

(ii) the first sets of subframes are received over a first bandwidth that includes both a Pcell and an Scell and the second set of subframes are received over a second bandwidth that includes only the Pcell; and

(iii) reducing a bandwidth, based on the paging occasion for the gap duration in each period of the periodicity, from the first bandwidth to the second bandwidth at the transitions between the first set of subframes and the second set of subframes wherein further, neither the first carrier nor the second carrier is received over a third sest of subframes;

estimating CQI/PMI/RI for the Pcell to generate a first CQI/PMI/RI metric, wherein the CQI/PMI/RI is determined based on a first interference estimate for the first set of subframes;

estimating CQI/PMI/RI for the Pcell to generate a second CQI/PMI/RI metric, wherein the CQI/PMI/RI is determined based on a second interference estimate for the second set of subframes; and

transmitting the first CQI/PMI/RI metric and the second CQI/PMI/RI metric.

6. The method of claim 5 wherein the UE estimates the first CQI/PMI/RI metric and the second CQI/PMI/RI metric when the power difference between the Pcell and the Scell exceeds a threshold.

7. A method in a UE, the method comprising:

identifying a paging occasion where a first bandwidth may be reduced to a second bandwidth;

receiving scheduling information associated with a periodicity and gap duration of a transition from a first set of subframes to a second set of subframes;

operating over the first bandwidth to receive a first Pcell carrier and a second Scell carrier in the first set of subframes;

reducing bandwidth, based on the paging occasion for the gap duration in each period of the periodicity, to operate over the second bandwidth to receive only the first Pcell carrier in the second set of subframes for the identified gap duration; and

performing a first set measurements only while operating over the second bandwidth in the second set of subframes.

8. The method of claim 7 wherein the UE operates over the second bandwidth when the power difference between the first and the second carrier exceeds a threshold.

9. The method of claim 7 wherein the first set of measurements comprise determining OOS/IS events towards radio link monitoring.

10. The method of claim 7 wherein the first set of measurements comprise estimating at least one of a RSRP, RSSI and RSRQ.

11. A method in a base station to enable a mobile station to receiving control signaling, the method comprising:

configuring the mobile station to operate on a first carrier and a second carrier;

indicating to the mobile station scheduling information associated with a periodicity and a gap duration where the mobile station may reduce bandwidth for the indicated gap duration in each period of the indicated periodicity;

transmitting control signaling, on the first carrier, in frames occurring during the gap duration; and

transmitting signals at a reduced power, on the second carrier, during the gap duration.

12. The method of claim 11 further comprising:

receiving measurement information, from the mobile station, indicating measurements of the first carrier and second carrier; and

transmitting signals at a reduced power on the second carrier, if the measurements indicate a substantial power imbalance between the first carrier and the second carrier.