 Multiple clock synthesizer |
| In a preferred embodiment of the invention, there is provided a multiple clock synthesizer having ... |
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| Phase and frequency adjustable digital phase lock logic system |
| According to the present invention, a phase lock logic system is provided for determining (i) the ... |
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| Digital phase alignment and integrated multichannel transceiver employing same |
| We claim: 1. A synchronizer for phase aligning an input signal, having a data transition, with a ... |
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| Spread spectrum communication apparatus |
| It is an object of the invention to rapidly and properly set a transmission power. Another object ... |
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| Advanced technology anti-G suit |
| Referring now to FIG. 1 of the drawings, there is shown a simplified perspective view of an anti-G ... |
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| Multiple satellite repeater capacity loading with multiple spread spectrum gateway antennas |
| This invention is directed to a communication system, and to a method executed by same, for ... |
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| Partial-response-channel precoding |
| In the HDTV system shown in FIG. 1, binary input data in the form of an HDTV signal is generated ... |
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| Method of digital transmission of messages using dynamic-range-limited precoding |
| An object of the invention is to reduce the dynamic range of the received signal in a digital ... |
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Adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within a wireless communication system
| Details |
Inventors: Gilbert, Sheldon L.; Hadar, Rami; Klein, Israel J.;
Assignee: Ensemble Communications, Inc. (San Diego, CA)
Primary Examiner: Marcelo; Melvin
Assistant Examiner:
Attorney, Agent or Firm: Jaquez & Associates, Jaquez; Martin J.
An adaptive time division duplexing (ATDD) method and apparatus for duplexing transmissions on a communication link in wireless communication systems. Communication link efficiency is enhanced by dynamically adapting to the uplink and downlink bandwidth requirements of the communication channels. Time slots are flexibly and dynamically allocated for uplink or downlink transmissions depending upon the bandwidth needs of a channel. Communication link bandwidth requirements are continuously monitored using sets of pre-determined bandwidth requirement parameters. Communication channels are configured to have either symmetric or asymmetric uplink/downlink bandwidths depending upon the needs of the channel. Channel bandwidth asymmetry can be configured alternatively in favor of the uplink transmissions (i.e., more time slots are allocated for uplink transmissions than for downlink transmissions) or in favor of the downlink transmissions (i.e., more time slots are allocated for downlink transmissions than for uplink transmissions). A myriad of time slot allocation schemes are possible. One simplified time slot allocation scheme uses a "frame-based" approach. A preferred channel bandwidth analysis technique is disclosed which monitors and updates bandwidth requirement parameters associated with communication sessions, base stations and cell cluster controllers. In accordance with this technique, a communication session is preferably assigned both an "initial" and an "actual" set of bandwidth parameters. |
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DETAILED DESCRIPTION The present invention is an adaptive time division duplexing (ATDD) method and apparatus for duplexing transmissions in wireless communication systems.
The present ATDD invention facilitates the efficient use of communication channels in wireless communication systems by adapting to the uplink and downlink bandwidth requirements of the channels.
In accordance with the present invention, the communication link bandwidth requirements are continuously monitored using sets of pre-determined bandwidth requirement parameters.
The present ATDD invention flexibly and dynamically allocates time slots for either uplink or downlink transmissions in response to the changing bandwidth needs of the communication links.
The present invention is particularly useful in wideband or broadband wireless communication systems, although it may also be used in any data communication system where an adaptive and dynamic time division duplexing transmission scheme is desirable.
In contrast to the TDD systems of the prior art which have time slots dedicated for either uplink or downlink transmissions, the present ATDD invention dynamically changes the time slot designation as either an uplink or downlink transmission period.
Consequently, the uplink/downlink bandwidth allocation can be changed to accommodate the uplink/downlink bandwidth requirements of the link.
The present ATDD invention thus advantageously allows channels to use either a symmetric or asymmetric uplink/downlink time slot allocation depending upon the needs of the channel.
In the case of asymmetric time slot allocation, the present ATDD invention alternatively allows asymmetry in favor of the uplink (i.
e.
, allocates more uplink time slots than downlink time slots) or in favor of the downlink (i.
e.
, allocates more downlink time slots than uplink time slots).
A myriad of time slot allocation schemes are possible.
One simplified time slot allocation scheme uses a "frame-based" approach which allows the system to dynamically allocate a first number of time slots of a frame for downlink (alternatively, uplink) transmissions only while configuring the remaining time slots of the frame for uplink (alternatively, downlink) transmissions
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Multiplexer-related 
