Apparatus and method of establishing a downlink communication path in a wireless telecommunications system
First Claim
1. A method of establishing a downlink communication path in a wireless telecommunications system, comprising the steps of:
- receiving a downlink signal transmitted from a transmitter in a central terminal at a receiver in a subscriber terminal, the downlink signal including a master code sequence of the transmitter in the central terminal;
comparing an entire code and phase of the master code sequence of the transmitter in the central terminal within the downlink signal with an entire code and phase of the slave code sequence of the receiver in the subscriber terminal;
adjusting the phase of the slave code sequence to match the phase of the master code sequence, matching of the entire slave code sequence to the entire master code sequence determines a path delay in order to establish a downlink communication path between the transmitter in the central terminal and the receiver in the subscriber terminal, wherein the phase of the slave code sequence is adjusted in a coarse adjustment mode having one half increments of a chip period; and
verifying establishment of the downlink communication path by repeating the comparing step and the adjusting step across an entire length of the master code sequence.
14 Assignments
0 Petitions
Accused Products
Abstract
A wireless telecommunications system (1) includes a central terminal (10) for transmitting and receiving radio frequency signals to and from a subscriber terminal (20). A downlink communication path is established from a transmitter (200) of the central terminal (10) to a receiver (202) of the subscriber terminal (20). A downlink signal (212) is transmitted from the transmitter (200) to the receiver (202) during setup and operation of the wireless telecommunications system (1). The receiver (202) of the subscriber terminal (20) compares a code and phase of a master code sequence in the downlink signal (212) to a code and phase of a slave code sequence of the receiver (202). The receiver (202) adjusts the phase of the slave code sequence until a match is obtained with the master code sequence. Matching of the slave code sequence to the master code sequence facilitates establishment of the downlink communication path.
20 Citations
9 Claims
-
1. A method of establishing a downlink communication path in a wireless telecommunications system, comprising the steps of:
-
receiving a downlink signal transmitted from a transmitter in a central terminal at a receiver in a subscriber terminal, the downlink signal including a master code sequence of the transmitter in the central terminal; comparing an entire code and phase of the master code sequence of the transmitter in the central terminal within the downlink signal with an entire code and phase of the slave code sequence of the receiver in the subscriber terminal; adjusting the phase of the slave code sequence to match the phase of the master code sequence, matching of the entire slave code sequence to the entire master code sequence determines a path delay in order to establish a downlink communication path between the transmitter in the central terminal and the receiver in the subscriber terminal, wherein the phase of the slave code sequence is adjusted in a coarse adjustment mode having one half increments of a chip period; and verifying establishment of the downlink communication path by repeating the comparing step and the adjusting step across an entire length of the master code sequence. - View Dependent Claims (2, 3)
-
-
4. A system for establishing a downlink communication path in a wireless telecommunications system, comprising;
-
a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal having a master code sequence determined by the transmitter; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver operable to compare an entire code and phase of the master code sequence to an entire code and phase of a slave code sequence corresponding to the receiver, the receiver operable to adjust the phase of the slave code sequence such that the entire slave code sequence matches the entire master code sequence, wherein the receiver incrementally adjusts the phase of the slave code sequence in a coarse adjustment mode having one half increments of a chip period, the receiver operable to verify that the slave code sequence matches the master code sequence by again comparing and adjusting the entire code and phase of the slave code sequence with respect to the entire code and phase of the master code sequence. - View Dependent Claims (5, 6)
-
-
7. A subscriber terminal in a wireless telecommunications system, comprising:
a receiver operable to receive a downlink signal, the downlink signal having a master code sequence, the receiver having a slave code sequence, the receiver operable to compare an entire code and phase of the master code sequence to an entire code and phase of the slave code sequence, the receiver operable to adjust the phase of the entire slave code sequence such that the slave code sequence matches the entire master code sequence, wherein the receiver incrementally adjusts the phase of the slave code sequence in a coarse mode having one half increments of a chip period, the receiver operable to verify that the entire slave code sequence matches the entire master code sequence by again comparing and adjusting the entire code and phase of the slave code sequence with respect to the entire code and phase of the master code sequence. - View Dependent Claims (8, 9)
Specification