Apparatus and method of frame aligning information in a wireless telecommunications system
First Claim
1. A method of frame aligning information in a telecommunications system, comprising the steps of:
- transmitting a downlink signal from a transmitter in a central terminal;
receiving a downlink signal at a receiver in a subscriber terminal;
identifying a beginning of frame position in a data stream of the downlink signal, wherein the beginning of frame position corresponds to an eight bit frame alignment word within the downlink signal;
identifying a successive beginning of frame position in the data stream of the downlink signal;
establishing a downlink communication path from the transmitter in the central terminal to the receiver in the subscriber terminal for receipt of traffic on the downlink signal in response to identifying two successive beginning of frame positions, wherein each beginning of frame position corresponds to a frame alignment word within the downlink signal, wherein the frame alignment word is located in an overhead channel of the downlink signal, wherein the overhead channel is decoded into one of every ten bit positions of the downlink signal, wherein the beginning of frame identifying step includes extracting a first bit position of every ten bits of the downlink signal to identify the frame alignment word, and wherein the beginning of frame identifying step includes extracting a second bit position of every ten bits of the downlink signal to identify the frame alignment word upon an indication that the frame alignment word was not identified during the extraction of the first bit position.
11 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) carrying information partitioned into a plurality of frames. The downlink signal (212) includes an overhead channel (224) having a frame alignment signal (232) for each frame of information. The receiver (202) monitors the downlink signal (212) to identify the frame alignment signal (232). The downlink communication path is established when the receiver (202) identifies two successive frame alignment signals (232).
-
Citations
9 Claims
-
1. A method of frame aligning information in a telecommunications system, comprising the steps of:
-
transmitting a downlink signal from a transmitter in a central terminal; receiving a downlink signal at a receiver in a subscriber terminal; identifying a beginning of frame position in a data stream of the downlink signal, wherein the beginning of frame position corresponds to an eight bit frame alignment word within the downlink signal; identifying a successive beginning of frame position in the data stream of the downlink signal; establishing a downlink communication path from the transmitter in the central terminal to the receiver in the subscriber terminal for receipt of traffic on the downlink signal in response to identifying two successive beginning of frame positions, wherein each beginning of frame position corresponds to a frame alignment word within the downlink signal, wherein the frame alignment word is located in an overhead channel of the downlink signal, wherein the overhead channel is decoded into one of every ten bit positions of the downlink signal, wherein the beginning of frame identifying step includes extracting a first bit position of every ten bits of the downlink signal to identify the frame alignment word, and wherein the beginning of frame identifying step includes extracting a second bit position of every ten bits of the downlink signal to identify the frame alignment word upon an indication that the frame alignment word was not identified during the extraction of the first bit position. - View Dependent Claims (3, 4)
-
-
2. A method of frame aligning information in a telecommunications system, comprising the steps of:
-
transmitting a downlink signal from a transmitter in a central terminal; receiving a downlink signal at a receiver in a subscriber terminal; identifying a beginning of frame position in a data stream of the downlink signal, wherein the beginning of frame position corresponds to an eight bit frame alignment word within the downlink signal; identifying a successive beginning of frame position in the data stream of the downlink signal; establishing a downlink communication path from the transmitter in the central terminal to the receiver in the subscriber terminal for receipt of traffic on the downlink signal in response to identifying two successive beginning of frame positions; monitoring the beginning of frame position for each frame in the downlink signal; re-identifying two successive beginning of frame positions in response to receipt of three successive frames without detecting a beginning of frame position.
-
-
5. A system for frame aligning information in a wireless telecommunications system comprising:
-
a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a frame alignment word for each frame of information carried by the downlink signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver operable to identify two successive eight bit frame alignment words in the downlink signal, the receiver operable to establish a downlink communication path from the transmitter in the central terminal to the receiver in the subscriber terminal upon identifying two successive frame alignment words, wherein each frame alignment word is decoded into an overhead channel of the downlink signal, wherein the overhead channel is decoded into one bit of every ten bit positions of the downlink signal, wherein the receiver monitors a first bit position of every ten bits of the downlink signal for identification of successive frame alignment words, wherein the receiver monitors a second bit position of every ten bits of the downlink signal for identification of successive frame alignment words upon an indication that successive frame alignment words were not identified during the monitoring of the first bit position. - View Dependent Claims (6)
-
-
7. A system for frame aligning information in a wireless telecommunications system comprising:
-
a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a frame alignment word for each frame of information carried by the downlink signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver operable to identify two successive eight bit frame alignment words in the downlink signal, the receiver operable to establish a downlink communication path from the transmitter in the central terminal to the receiver in the subscriber terminal upon identifying two successive frame alignment words, wherein the receiver continuously monitors the downlink signal for frame alignment words, the receiver re-identifying two successive frame alignment words in response to three successive frames without identifying a frame alignment word.
-
-
8. A subscriber terminal in a wireless telecommunications system, comprising:
a receiver operable to receive a downlink signal, the downlink signal carrying information partitioned into a plurality of frames, the downlink signal including an eight bit frame alignment word for each of the plurality of frames, the frame alignment word being decoded into an overhead channel of the downlink signal, the overhead channel decoded into one of every ten bit positions of the downlink signal, the receiver operable to identify two successive frame alignment words from the overhead channel of the downlink signal in order to establish a downlink communication path, wherein the receiver monitors a first bit position of every ten bits of the downlink signal to identify frame alignment words, wherein the receiver monitors a second bit position of every ten bits of the downlink signal to identify frame alignment words upon an indication that two successive frame alignment words were not identified during monitoring of the first bit position.
-
9. A subscriber terminal in a wireless telecommunications system, comprising:
a receiver operable to receive a downlink signal, the downlink signal carrying information partitioned into a plurality of frames, the downlink signal including an eight bit frame alignment word for each of the plurality of frames, the frame alignment word being decoded into an overhead channel of the downlink signal, the overhead channel decoded into one of every ten bit positions of the downlink signal, the receiver operable to identify two successive frame alignment words from the overhead channel of the downlink signal in order to establish a downlink communication path, wherein the receiver continuously monitors the downlink signal for frame alignment words, the receiver re-identifying two successive frame alignment words in response to an interruption of the downlink communication path or upon receiving three successive frames of information without detecting a frame alignment word.
Specification