Method and Apparatus for Operation with Carrier Aggregation of Time Division Duplex Cells
First Claim
1. A method at a network node in a wireless communication network comprising:
- serving a half-duplex, Time Division Duplex (TDD) wireless device having a carrier aggregation configuration that includes a primary cell and a secondary cell having different Uplink/Downlink (UL/DL) configurations;
identifying a normal downlink subframe in the secondary cell as having a first portion overlapped by a downlink portion of a special subframe in the primary cell and a second portion overlapped by an uplink portion of the special subframe;
adapting transmission to the wireless device for the normal downlink subframe in the secondary cell, so that data targeted to the wireless device is not sent in the second portion of the normal downlink subframe.
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Accused Products
Abstract
According to the network-side teachings herein, transmission adaptations taken with respect to a secondary serving cell provide improved operation in the context of serving a half-duplex wireless device having a carrier aggregation configuration involving primary and secondary cells with different Time Division Duplex (TDD) uplink/downlink configurations. Transmission adaptations are taken with respect to a normal downlink subframe in a secondary cell that is time-wise overlapped by a special subframe in the primary cell. Similarly, improved operations are obtained on the device-side according to reception adaptations taken with respect to normal downlink subframes in a secondary cell that are overlapped by special subframes in the primary cell. Non-limiting improvements include better channel estimation and link adaptation, improved scheduling, and revised timings for the transmission and reception of user or control data targeting the device.
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Citations
27 Claims
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1. A method at a network node in a wireless communication network comprising:
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serving a half-duplex, Time Division Duplex (TDD) wireless device having a carrier aggregation configuration that includes a primary cell and a secondary cell having different Uplink/Downlink (UL/DL) configurations; identifying a normal downlink subframe in the secondary cell as having a first portion overlapped by a downlink portion of a special subframe in the primary cell and a second portion overlapped by an uplink portion of the special subframe; adapting transmission to the wireless device for the normal downlink subframe in the secondary cell, so that data targeted to the wireless device is not sent in the second portion of the normal downlink subframe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A network node configured for use in a wireless communication network and comprising:
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a communication interface configured for sending data to and receiving data from wireless devices operating in one or more cells of the wireless communication network; a processing circuit that is operatively associated with the communication interface and, with respect to a half-duplex wireless device being served in a carrier aggregation configuration that includes a primary cell and a secondary cell having different Time Division Duplex (TDD) configurations, configured to; identify a normal downlink subframe in the secondary cell as having a first portion overlapped by a downlink portion of a special subframe in the primary cell and a second portion overlapped by an uplink portion of the special subframe; and adapt transmission to the wireless device for the normal downlink subframe, so that data targeted to the wireless device is not sent in the second portion of the normal downlink subframe. - View Dependent Claims (13)
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14. A method in a half-duplex capable wireless device operating in a wireless communication network, said method comprising:
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operating in a Time Division Duplex (TDD) mode having a carrier aggregation configuration that includes a primary cell and a secondary cell having different Uplink/Downlink (UL/DL) configurations; identifying a normal downlink subframe in the secondary cell as having a first portion overlapped by a downlink portion of a special subframe in the primary cell and a second portion overlapped by an uplink portion of the special subframe; and adapting reception for the normal downlink subframe in the secondary cell, based on treating the normal downlink subframe as an abbreviated downlink subframe having all user or control data targeted to the wireless device only within the first portion. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A half-duplex capable wireless device configured for operation in a wireless communication network, said wireless device comprising:
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a communication interface configured to receive signals from the wireless communication network and to transmit signals to the wireless communication network; and a processing circuit that is operatively associated with the communication interface and, for the case where the wireless device operates in a Time Division Duplex (TDD) mode having a carrier aggregation configuration that includes a primary cell and a secondary cell of the wireless communication network having different Uplink/Downlink (UL/DL) configurations, is configured to; identify a normal downlink subframe in the secondary cell as having a first portion overlapped by a downlink portion of a special subframe in the primary cell and a second portion overlapped by an uplink portion of the special subframe; and adapt reception for the normal downlink subframe in the secondary cell, based on treating the normal downlink subframe as an abbreviated downlink subframe having all user or control data targeted to the wireless device only within the first portion. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification