RADIO ACCESS NETWORKS
First Claim
1. A communication system comprising:
- remote units to exchange radio frequency (RF) signals with mobile devices, at least some of the RF signals comprising information destined for, or originating from, a mobile device;
a reference timing source synchronized with a coordinated universal time (UTC) or a Global Positioning System (GPS);
a controller comprising one or more modems and connected to an external network, at least one of the modems being a baseband modem and being configured to pass first data corresponding to the information, wherein the controller is separated from the remote units by an intermediate network over which second data corresponding to the information is transmitted in frames between the controller and the remote units, and wherein the second data comprises baseband data,a controller clock synchronized with the reference timing source, the controller clock providing timing information to the controller; and
a remote unit clock synchronized with the controller clock, the remote unit clock providing timing information to a remote unit, the controller and the remote unit being configured to transmit time stamp messages to synchronize the controller clock and the remote unit clock, wherein the controller and the remote unit are configured to transmit the time stamp messages by avoiding contention between time stamp transmissions and baseband data transmissions or between time stamp transmissions of different remote units to the controller.
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Accused Products
Abstract
Among other things, a communication system comprising remote units, a reference timing source, a controller, a controller clock, and a remote unit clock. The remote units exchange radio frequency (RF) signals with mobile devices. The reference timing source is synchronized with a coordinated universal time (UTC) or a Global Positioning System (GPS). The controller clock is synchronized with the reference timing source and provides timing information to the controller. The remote unit clock is synchronized with the controller clock and provides timing information to a remote unit. The controller and the remote unit are configured to transmit time stamp messages to synchronize the controller clock and the remote unit clock, by avoiding contention between time stamp transmissions and baseband data transmissions or between time stamp transmissions of different remote units to the controller.
132 Citations
28 Claims
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1. A communication system comprising:
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remote units to exchange radio frequency (RF) signals with mobile devices, at least some of the RF signals comprising information destined for, or originating from, a mobile device; a reference timing source synchronized with a coordinated universal time (UTC) or a Global Positioning System (GPS); a controller comprising one or more modems and connected to an external network, at least one of the modems being a baseband modem and being configured to pass first data corresponding to the information, wherein the controller is separated from the remote units by an intermediate network over which second data corresponding to the information is transmitted in frames between the controller and the remote units, and wherein the second data comprises baseband data, a controller clock synchronized with the reference timing source, the controller clock providing timing information to the controller; and a remote unit clock synchronized with the controller clock, the remote unit clock providing timing information to a remote unit, the controller and the remote unit being configured to transmit time stamp messages to synchronize the controller clock and the remote unit clock, wherein the controller and the remote unit are configured to transmit the time stamp messages by avoiding contention between time stamp transmissions and baseband data transmissions or between time stamp transmissions of different remote units to the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification