Source: https://patents.google.com/patent/US9807633B2/en
Timestamp: 2019-07-23 02:17:11
Document Index: 439204480

Matched Legal Cases: ['Application No. 11785237', 'Application No. 11785238', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 201180053437', 'Application No. 201180053446']

US9807633B2 - Configuring unscheduled periods to enable interference reduction in heterogeneous networks - Google Patents
US9807633B2
US9807633B2 US13/288,829 US201113288829A US9807633B2 US 9807633 B2 US9807633 B2 US 9807633B2 US 201113288829 A US201113288829 A US 201113288829A US 9807633 B2 US9807633 B2 US 9807633B2
US13/288,829
US20120113847A1 (en
2011-11-03 Application filed by Google Technology Holdings LLC filed Critical Google Technology Holdings LLC
2011-11-03 Assigned to MOTOROLA MOBILITY, INC. reassignment MOTOROLA MOBILITY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRISHNAMURTHY, SANDEEP H., KUCHIBHOTLA, RAVI, NARASIMHA, MURALI
2012-05-10 Publication of US20120113847A1 publication Critical patent/US20120113847A1/en
2017-10-31 Publication of US9807633B2 publication Critical patent/US9807633B2/en
In order to operate multiple cells with overlapping coverage on a carrier frequency, such as in a heterogeneous network 100 in FIG. 1, it is necessary to have coordination between the cells so that the transmissions don't interfere with one another. LTE heterogeneous networks will use time division techniques to minimize interference. Specifically, a cell can be configured with patterns of subframes during which it does not schedule user data. Such subframes are referred to as “blank subframes”. Furthermore, it may be necessary to transmit some critically important information in all subframes. For example, it may be necessary to transmit cell-specific reference symbols (CRS) to enable UEs to perform measurements during the subframe. It may also be necessary to transmit primary and secondary synchronization signals (PSS and SSS), primary broadcast channel (PBCH) and System Information Block 1 (SIB1), Paging Channel and the Positioning Reference Signal (PRS). Such information is essential for proper operation of functions such as cell search and maintenance of up-to-date system information. Blank subframes which are not used for scheduling data but can be used for transmission of a restricted set of information (such as the critically important information described above) are referred to as “almost blank subframes” (AB subframes). In LTE AB subframes of a base station, the base station can be configured to not transmit any energy on all resource elements, except for resource elements used for (a) CRS, (b) PSS and SSS, (c) PBCH, (d) SIB1, and (e) paging messages.
1. A mobile station configured to be connected to a serving base station comprising:
the processor configured to determine a first almost blank (AB) subframe pattern including a first set of AB subframes during which a neighboring base station is only allowed to transmit a restricted set of information;
the processor configured to determine a second AB subframe pattern including a second set of AB subframes during which a second neighboring base station is only allowed to transmit a second restricted set of information;
the processor configured to switch from performing measurements of signals of the serving base station using the first AB subframe pattern including the first set of AB subframes to performing measurements of signals of the serving base station using the second AB subframe pattern including the second set of AB subframes, if a signal level of the second neighboring base station is higher than a signal level of the neighboring base station;
the processor configured to cause the transceiver to transmit a measurement report including at least the measurements of signals of the serving base station; and
the processor configured to indicate that the measurements of signals of the serving base station were performed using at least one of the first AB subframe pattern including the first set of AB subframes and the second AB subframe pattern including the second set of AB subframes.
4. The mobile station according to claim 3, wherein the processor is configured to indicate that the measurements of the signals of the serving base station were performed during time periods in which the neighboring base station is scheduled to transmit only the restricted set of information comprises identifying the neighboring base station by:
signaling a cell identity of the neighboring base station; or
signaling an index corresponding to the neighboring base station, wherein the index uniquely identifies the neighboring base station.
5. A method in a mobile station connected to a serving base station, the method comprising:
determining a first almost blank (AB) subframe pattern including a first set of AB subframes during which a neighboring base station is only allowed to transmit a restricted set of information;
determining a second AB subframe pattern including a second set of AB subframes during which a second neighboring base station is only allowed to transmit a second restricted set of information;
switching from performing measurements of signals of the serving base station using the first AB subframe pattern including the first set of AB subframes to performing measurements of signals of the serving base station using the second AB subframe pattern including the second set of AB subframes, if a signal level of the second neighboring base station is higher than a signal level of the neighboring base station;
transmitting a measurement report including at least the measurements of signals of the serving base station; and
indicating that the measurements of the signals of the serving base station were performed using at least one of the first AB subframe pattern including the first set of AB subframes and the second AB subframe pattern including the second set of AB subframes.
7. The method according to claim 5, wherein indicating that the measurements of the signals of the serving base station were performed during the first AB subframe pattern including the first set of AB subframes includes:
indicating that the measurements of the signals of the serving base station were performed during time periods in which the neighboring base station is scheduled to transmit only the restricted set of information.
8. The method according to claim 7, wherein indicating that the measurements of the signals of the serving base station were performed during time periods in which the neighboring base station is scheduled to transmit only the restricted set of information comprises identifying the neighboring base station by:
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NARASIMHA, MURALI;KRISHNAMURTHY, SANDEEP H.;KUCHIBHOTLA, RAVI;REEL/FRAME:027172/0145