Apparatus and method for reception and transmission of control channels
地域：
IL
IL Chicago
摘要
A base station can operate a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency. The base station can perform a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration. The base station can determine that the unlicensed carrier frequency is free. The base station can transmit an activation command on the first serving cell for receipt by a UE, the activation command being configured to activate the UE to receive transmissions from the base station on the second serving cell. The base station can transmit after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the base station begins transmission of the activation command on the first serving cell.
說(shuō)明書(shū)
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The following disclosure relates to wireless telecommunication transmissions of Long Term Evolution (LTE) type communication signals. In particular, the following disclosure relates to approaches for truncating transmissions in the LTE subframe signal and signaling options for the transmission of control channels and reference signals.
LTE Advanced is being considered for deployment in the unlicensed spectrum in the 5 GHz band. To do so, licensed spectrum in the range 400 MHz to 3.8 GHz and spectrum in the unlicensed spectrum bands would be aggregated together similar to the way that the licensed spectrum bands are treated in standard LTE Advanced carrier aggregation (CA). Regulatory authorities around the world have defined or are defining a wide variety of requirements so that various systems can inter-operate with incumbent users in the unlicensed bands, notably including WiFi deployments.
權(quán)利要求
What is claimed is:1. A method for a base station to make a transmission between the base station and a user equipment (UE) on an unlicensed carrier frequency, the method comprising:operating, by the base station, a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency; performing, by the base station, a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration; determining, by the base station, that the unlicensed carrier frequency is free; transmitting, by the base station, an activation command on the first serving cell for receipt by the UE, the activation command being configured to activate the UE to receive transmissions from the base station on the second serving cell; and transmitting, by the base station, after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the base station begins transmission of the activation command on the first serving cell. 2. The method of claim 1 , further comprising preparing, by the base station, the activation command while transmitting the reserve transmission on the unlicensed carrier frequency. 3. The method of claim 1 , further comprising scheduling, by the base station, data to be transmitted to the UE on the unlicensed carrier frequency for a determined number of subframes. 4. The method of claim 3 , further comprising:discontinuing transmission of scheduled data by the base station to the UE after the determined number of subframes; and performing, by the base station, the LBT on the unlicensed carrier frequency for a second time duration. 5. An apparatus comprising:a controller thatoperates a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency, performs a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration, and determines that the unlicensed carrier frequency is free; and a transceiver coupled to the controller, where the transceivertransmits an activation command on the first serving cell for receipt by a user equipment (UE), the activation command being configured to activate the UE to receive transmissions from the apparatus on the second serving cell, and transmits, after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the apparatus begins transmission of the activation command on the first serving cell. 6. The apparatus of claim 5 , wherein the controller prepares the activation command while transmitting the reserve transmission on the unlicensed carrier frequency. 7. The apparatus of claim 5 , wherein the controller schedules data to be transmitted to the UE on the unlicensed carrier frequency for a determined number of subframes. 8. The apparatus of claim 7 , wherein the controllerdiscontinues transmission of scheduled data by the apparatus to the UE after the determined number of subframes, and performs the LBT on the unlicensed carrier frequency for a second time duration. 9. The method of claim 1 , wherein an activation command transitions the UE from an unlicensed carrier receive deactivated state to an unlicensed carrier frequency receive activated state. 10. The method of claim 1 , further comprising:transmitting reference signals on the unlicensed carrier between transmitting the activation command and transmitting data on the unlicensed carrier; and transmitting the data on a physical downlink shared channel on the unlicensed carrier after transmitting the reference signals. 11. The method of claim 2 , wherein preparing the activation command comprises determining control channel elements for physical downlink control channel transmission of the activation command. 12. The apparatus of claim 5 , wherein an activation command transitions the UE from an unlicensed carrier receive deactivated state to an unlicensed carrier frequency receive activated state. 13. The apparatus of claim 5 , wherein the transceiver:transmits reference signals on the unlicensed carrier between transmitting the activation command and transmitting data on the unlicensed carrier; and transmits the data on a physical downlink shared channel on the unlicensed carrier after transmitting the reference signals. 14. A base station for wireless communication, comprising:at least one memory; and at least one processor coupled with the at least one memory and configured to cause the base station to:operate a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency; perform a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration; determine that the unlicensed carrier frequency is free; transmit an activation command on the first serving cell for receipt by a user equipment (UE), the activation command being configured to activate the UE to receive transmissions from the base station on the second serving cell; and transmit after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the base station begins transmission of the activation command on the first serving cell. 15. The base station of claim 14 , wherein the at least one processor is configured to cause the base station to prepare the activation command while transmitting the reserve transmission on the unlicensed carrier frequency. 16. The base station of claim 15 , wherein preparing the activation command comprises determining control channel elements for physical downlink control channel transmission of the activation command. 17. The base station of claim 14 , wherein the at least one processor is configured to cause the base station to schedule data to be transmitted to the UE on the unlicensed carrier frequency for a determined number of subframes. 18. The base station of claim 17 , wherein the at least one processor is configured to cause the base station to:discontinue transmission of scheduled data by the base station to the UE after the determined number of subframes; and perform the LBT on the unlicensed carrier frequency for a second time duration. 19. The base station of claim 14 , wherein an activation command transitions the UE from an unlicensed carrier receive deactivated state to an unlicensed carrier frequency receive activated state. 20. The base station of claim 14 , wherein the at least one processor is configured to cause the base station to:transmit reference signals on the unlicensed carrier between transmitting the activation command and transmitting data on the unlicensed carrier; and transmit the data on a physical downlink shared channel on the unlicensed carrier after transmitting the reference signals.
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