Static delay compensation in a telecommunications system
地域：
NC
NC Hickory
摘要
Certain features relate to compensating for a roundtrip delay caused by a distributed antenna system. A delay unit communicatively coupled to a base station can intercept the delay compensation signaling communicated between the digital baseband unit of the base station and the radio transmitter unit of the base station. The delay unit can adjust the delay compensation signaling by adding to the delay compensation signaling the pre-determined fiber delay caused by the DAS. In some aspects, the delay unit can delay the control words for a base station operating under the Common Public Radio Interface standard. In other aspects, the delay unit can delay the round-trip time measurement message for a base station operating under the Open Base Station Architecture Initiative standard.
說明書
This application is a continuation of U.S. patent application Ser. No. 14/717,642, filed May 20, 2015, and titled “Static Delay Compensation in a Telecommunications System,” which claims priority to U.S. Provisional Application Ser. No. 62/076,260, filed Nov. 6, 2014, and titled “Static Delay Compensation in a Telecommunications System,” the contents of all of which are incorporated herein by reference.
The disclosure relates generally to telecommunications and, more particularly (although not necessarily exclusively), to configuring a telecommunications system to compensate for static delays caused by the use of a distributed antenna system.
A DAS can be used to extend wireless coverage in an area through the use of one or more head-end units and multiple remote units coupled to each head-end unit. Head-end units can be coupled to one or more base stations that can each manage wireless communications for different cell sites. A head-end unit can receive downlink signals from the base station and distribute downlink signals in analog or digital form to one or more remote units. The remote units can wirelessly transmit the downlink signals to user equipment devices within coverage areas serviced by the remote units. In the uplink direction, signals from user equipment devices may be received by the remote units. The remote units can transmit the uplink signals received from user equipment devices to the head-end unit. The head-end unit can transmit uplink signals to the serving base stations.
權(quán)利要求
What is claimed is:1. A system comprising:a distributed antenna system for being communicatively coupled to a base station, the distributed antenna system including a head-end unit and one or more remote units communicatively coupled to the head-end unit, the head-end unit being configured to transmit wireless communication data in signals from the base station to the one or more remote units that are configured to wirelessly transmit the wireless communication data to user devices; and a delay unit communicatively coupled to the base station, the delay unit being configured to introduce, to the base station, a delay in control information included in a frame processed by the base station, the delay corresponding to an increase in a roundtrip delay between the base station and the user devices caused by the distributed antenna system. 2. The system of claim 1 , wherein the delay unit is configured to add the delay to the control information by delaying a control byte of a Common Public Radio Interface transmit frame for a duration of the increase in the roundtrip delay caused by the distributed antenna system. 3. The system of claim 2 , wherein the duration of the delay includes a time between a transmission of an internal frame start of the transmit frame transmitted from a digital baseband unit of the base station and a receipt of a receive frame start received at the digital baseband unit of the base station. 4. The system of claim 3 , wherein the delay unit includes a ring buffer including a read pointer and a write pointer, the ring buffer being configured to store the control byte of the Common Public Radio Interface Transmit frame,wherein a distance between the read pointer and the write pointer corresponds to the delay. 5. The system of claim 1 , wherein the delay unit is configured to add the delay to the control information by deleting a round-trip time measurement message from an Open Base Station Architecture Initiative transmit signal and inserting the round-trip time measurement message after a duration of the increase in the roundtrip delay caused by the distributed antenna system. 6. The system of claim 1 , wherein the distributed antenna system is configured so that the increase in the roundtrip delay is proportional to a length of a communication link between the head-end unit and the one or more remote units. 7. The system of claim 1 , wherein the control information included in the frame is part of delay compensation signaling between a digital baseband unit of the base station and a radio transmitter unit of the base station. 8. A method, comprising:receiving an optical signal from a radio transmitter unit of a base station, the optical signal including a first frame including control information and data information; generating delayed control information from the control information included in the first transmit frame based on a delay corresponding to a duration of an increase in a roundtrip delay between the base station and user devices caused by a distributed antenna system communicatively coupled to the base station; generating second transmit frame by multiplexing the delayed control information and the data information; and transmitting the second transmit frame to a digital baseband unit of the base station. 9. The method of claim 8 , wherein generating the delayed control information comprises delaying a control byte of a Common Public Radio Interface transmit frame for the duration of the increase in the roundtrip delay caused by the distributed antenna system. 10. The method of claim 8 , wherein generating the delayed control information comprises delaying a round-trip time measurement message for an Open Base Station Architecture Initiative transmit signal and inserting the round-trip time measurement message after the duration of increase in the roundtrip delay caused by the distributed antenna system. 11. The method of claim 9 , wherein the duration of an increase in the roundtrip delay includes a time between a transmission of an internal frame start of a transmit frame transmitted from the digital baseband unit of the base station and a receipt of a receive frame start received at the digital baseband unit of the base station. 12. The method of claim 8 , wherein the increase in the roundtrip delay caused by the distributed antenna system is proportional to a length of a communication link between a head-end unit and one or more remote units of the distributed antenna system. 13. The method of claim 12 , wherein the head-end unit is configured to provide wireless communication signals from the base station to the one or more remote units and the one or more remote units are configured to provide the wireless communication signals to the user devices. 14. A head-end unit, comprising:a first interface configured to receive and transmit, with a radio transmitter unit of a base station, signals that include wireless communication data; a second interface configured to transmit the wireless communication data from the radio transmitter unit of the base station to one or more remote units of a distributed antenna system; and a delay unit for being communicatively coupled to a digital baseband unit of the base station and the radio transmitter unit of the base station, the delay unit being configured to introduce, to the base station, a delay corresponding to an increase in a roundtrip delay between the base station and a user device caused by the distributed antenna system by introducing the delay to control information included in a frame processed by the base station. 15. The head-end unit of claim 14 , wherein the delay unit is configured to introducing the delay to the control information by delaying a control byte of a Common Public Radio Interface transmit frame for a duration of the increase in the roundtrip delay caused by the distributed antenna system. 16. The head-end unit of claim 15 , wherein the delay includes a time between a transmission of an internal frame start of a transmit frame transmitted from the digital baseband unit of the base station and a receipt of a receive frame start received at the digital baseband unit of the base station. 17. The head-end unit of claim 16 , wherein the delay unit includes a ring buffer including a read pointer and a write pointer, the ring buffer configured to store the control byte of the Common Public Radio Interface Transmit frame, and wherein a distance between the read pointer and the write pointer corresponds to the delay. 18. The head-end unit of claim 14 , wherein the delay unit is configured to introduce the delay to the control information by deleting a round-trip time measurement message from an Open Base Station Architecture Initiative transmit signal and inserting the round-trip time measurement message after a duration of the increase in the roundtrip delay caused by the distributed antenna system. 19. The head-end unit of claim 14 , wherein the increase in the roundtrip delay caused by the distributed antenna system is proportional to a length of a communication link between the head-end unit and the one or more remote units. 20. The head-end unit of claim 14 , wherein the control information included in the frame is part of delay compensation signaling between the digital baseband unit of the base station and the radio transmitter unit of the base station. 21. A delay unit for a distributed antenna system, the delay unit comprising:a first optical port configured to couple to an optical interface of a digital baseband unit of a base station; a second optical port configured to couple to an optical interface of a radio transmitter unit of the base station, wherein the base station communicates with a distributed antenna system via the radio transmitter unit; wherein the delay unit is configured to intercept signals transmitted between the digital baseband unit and the radio transmitter unit and introduce a delay corresponding to an increase in a roundtrip delay between the base station and user devices caused by the distributed antenna system, the user devices operating within a coverage area of the distributed antenna system. 22. The delay unit of claim 21 , further comprising:a buffer configured to store control information from the radio transmitter unit; wherein the buffer delays transmission of a control channel of a transmit signal provided from the radio transmitter unit based on the increase in the roundtrip delay. 23. The delay unit of claim 21 , wherein the delay unit is configured to introduce the delay by deleting a round trip time measurement message from an Open Base Station Architecture Initiative transmit signal and inserting the round-trip time measurement message after a duration of the increase in the roundtrip delay caused by the distributed antenna system.
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