Distribution Of Cell-Common Downlink Signals In A Hierarchical Heterogeneous Cell Deployment
First Claim
1. A method for transmitting data to a mobile station, the method comprising transmitting cell-specific reference symbol, CRS, signals from a primary, high-power, transmitting node having a first coverage area, the method comprising:
- transmitting the same CRS signals from one or more secondary, low-power, transmitting nodes, each of the secondary transmitting nodes having a coverage area that is within or substantially within the first coverage area; and
simultaneously transmitting a physical downlink data channel to a mobile station from the primary, high-power, transmitting node and from at least one of the one or more secondary, low-power, transmitting nodes.
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Accused Products
Abstract
A high-power point (110) and one or more low-power points (120) transmit signals that are associated with the same cell-identifier in a heterogeneous cell deployment. The coverage areas corresponding to the low-power points (120) fall at least partly within the coverage area for the high-power point (110), so that mobile stations (130) within range of a low-power point are also within range of the high-power point (110), from a downlink perspective. The same CRS signals are transmitted by both the high-power (macro) point (110) and some or all of the low-power (pico) points (120). At the same time, the network transmits CRS-based PDSCH for a particular UE on both the high-power point (110) as well as on some or all of the low-power points (120). In some embodiments only a subset of the points, e.g., those points that the UE hears sufficiently well, participate in the PDSCH transmission using CRS for channel estimation.
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Citations
25 Claims
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1. A method for transmitting data to a mobile station, the method comprising transmitting cell-specific reference symbol, CRS, signals from a primary, high-power, transmitting node having a first coverage area, the method comprising:
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transmitting the same CRS signals from one or more secondary, low-power, transmitting nodes, each of the secondary transmitting nodes having a coverage area that is within or substantially within the first coverage area; and simultaneously transmitting a physical downlink data channel to a mobile station from the primary, high-power, transmitting node and from at least one of the one or more secondary, low-power, transmitting nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system of transmitting nodes in a wireless network, the system comprising:
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a primary, high-power, transmitting node configured to transmit cell-specific reference symbol, CRS, signals over a first coverage area, and; one or more secondary, low-power, transmitting nodes, each configured to transmit the same CRS signals over a coverage area that is within or substantially within the first coverage area; wherein said primary transmitting node and at least one of said one or more secondary transmitting nodes are configured to simultaneously transmit a physical downlink data channel to a first mobile station. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A control unit for use in a wireless network having a primary, high-power, transmitting node with a first coverage area and a plurality of secondary, low-power, transmitting nodes, each having a coverage area that is within or substantially within the first coverage area, the control unit comprising:
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a network communication circuit configured to transmit and receive control information to and from said secondary transmitting nodes; and a processing circuit configured to configure said primary transmitting node to transmit CRS signals over the first coverage area; wherein the processing circuit is further configured to; configure one or more of said secondary transmitting nodes to transmit the same CRS signals; and configure said primary transmitting node and at least one of said one or more secondary transmitting nodes to simultaneously transmit a physical downlink data channel to a mobile station. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method implemented by a control unit for use in a wireless network comprising a primary, high-power, transmitting node having a first coverage area and a plurality of secondary, low-power, transmitting nodes, each having a coverage area that is within or substantially within the first coverage area, the method comprising:
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configuring said primary transmitting node to transmit CRS signals over the first coverage area; configuring one or more of said secondary transmitting nodes to transmit the same CRS signals; and configuring the primary transmitting node and at least one of the one or more secondary transmitting nodes to simultaneously transmit a physical downlink data channel to a mobile station.
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Specification