Methods of discovery and measurements for small cells in OFDM/OFDMA systems
First Claim
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1. A method comprising:
- receiving, by a user equipment (UE), configuration information of discovery reference signals (DRS) that include at least one of a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), wherein the configuration information indicates a transmission periodicity and a transmission time length of the DRS over a set of resource elements (REs) in multiple time-domain OFDM symbols;
determining whether RE muting is applied in a first set of OFDM symbols within the transmission time length based on the configuration information, and determining RE muting is not applied in a second set of OFDM symbols within the transmission time length when the DRS includes the CSI-RS; and
performing measurement of a first metric using the second set of OFDM symbols within the transmission time length based on the configuration information and the determined RE muting pattern to improve measurement performance.
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Abstract
A method of small cell discovery and RSRP/RSRQ measurements in OFDM/OFDMA systems is proposed. A discovery reference signal (DRS) with low transmission frequency is introduced to support small cell detection within a short time, multiple small cell discovery, and accurate measurement of multiple small cells. The DRS consists of one or multiple reference signal types with the functionalities including timing and frequency synchronization, cell detection, RSRP/RSSI/RSRQ measurements, and interference mitigation. RE muting is configured for the DRS to reduce interference level from data to DRS for discovery and RSRP/RSRQ measurements for small cells.
42 Citations
20 Claims
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1. A method comprising:
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receiving, by a user equipment (UE), configuration information of discovery reference signals (DRS) that include at least one of a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), wherein the configuration information indicates a transmission periodicity and a transmission time length of the DRS over a set of resource elements (REs) in multiple time-domain OFDM symbols; determining whether RE muting is applied in a first set of OFDM symbols within the transmission time length based on the configuration information, and determining RE muting is not applied in a second set of OFDM symbols within the transmission time length when the DRS includes the CSI-RS; and performing measurement of a first metric using the second set of OFDM symbols within the transmission time length based on the configuration information and the determined RE muting pattern to improve measurement performance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A User Equipment (UE), comprising:
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a receiver that receives configuration information of discovery reference signals (DRS) that include at least one of a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), wherein the configuration information indicates a transmission periodicity and a transmission time length of the DRS over a set of resource elements (REs) in multiple time-domain OFDM symbols; a configuration circuit that determines whether RE muting is applied in a first set of OFDM symbols within the transmission time length based on the configuration information, and determines RE muting is not applied in a second set of OFDM symbols within the transmission time length when the DRS includes the CSI-RS; and a measurement circuit that performs measurement of a first metric using the second set of OFDM symbols within the transmission time length based on the configuration information and the determined RE muting pattern to improve measurement performance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification