Physical layer interface system and method for a wireless communication system
First Claim
1. A physical layer interface system for a broadband wireless access communication network that establishes communication between a base station and a plurality of fixed subscriber stations over a radio link for multiplexing an upstream channel and a downstream channel, said downstream channel transporting downstream frames from the base station to the subscriber stations using a time division multiplexing (TDM) transmission protocol, and said upstream channel transporting upstream frames from the subscriber stations to the base station using a time division multiplexing access (TDMA) protocol, the physical layer interface system comprising:
- a first physical layer interface at said base station for broadcasting over said downstream channel a continuous string of downlink frames to all subscriber stations, and for receiving from each currently active subscriber station a burst of uplink frames over said upstream channel; and
a second physical layer interface at said subscriber station for transmitting a respective burst in an assigned time-slot allocated in said upstream channel and for extracting the downstream frames addressed to the respective subscriber station;
wherein the downstream frames have a fixed length, including a synchronization byte and a configurable-length payload field; and
wherein the upstream frames have a frame size programmable in predetermined time increments and the virtual frame boundaries are determined from a downstream frame start indicator.
1 Assignment
0 Petitions
Accused Products
Abstract
Physical layer interface system for use in a broadband wireless access communication network is provided. The broadband wireless access communication network comprises a base station, a subscriber station and a wireless communication link for transmitting wireless communication signals upstream and downstream between the base station and the subscriber station. The physical interface system comprises a first physical layer interface for the base station for processing the communication signals upstream and downstream between the subscriber station and the base station and a second physical layer interface for the subscriber station for processing the communication signals upstream and downstream between the subscriber station and the base station. The first physical layer interface transmits downstream transmission of communication signals from the base station to the subscriber station in a burst mode.
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Citations
52 Claims
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1. A physical layer interface system for a broadband wireless access communication network that establishes communication between a base station and a plurality of fixed subscriber stations over a radio link for multiplexing an upstream channel and a downstream channel, said downstream channel transporting downstream frames from the base station to the subscriber stations using a time division multiplexing (TDM) transmission protocol, and said upstream channel transporting upstream frames from the subscriber stations to the base station using a time division multiplexing access (TDMA) protocol, the physical layer interface system comprising:
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a first physical layer interface at said base station for broadcasting over said downstream channel a continuous string of downlink frames to all subscriber stations, and for receiving from each currently active subscriber station a burst of uplink frames over said upstream channel; and a second physical layer interface at said subscriber station for transmitting a respective burst in an assigned time-slot allocated in said upstream channel and for extracting the downstream frames addressed to the respective subscriber station; wherein the downstream frames have a fixed length, including a synchronization byte and a configurable-length payload field; and wherein the upstream frames have a frame size programmable in predetermined time increments and the virtual frame boundaries are determined from a downstream frame start indicator. - 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, 29, 30)
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31. A physical layer interface system for use in a broadband wireless access communication network, said broadband wireless communication network comprising a base station, a subscriber station and a wireless communication link for transmitting wireless communication signals upstream and downstream between said base station and said subscriber station, said physical system comprising:
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a first physical layer interface for said base station for processing said communication signals upstream and downstream between said subscriber station and said base station, said first physical layer interface further comprising for said downstream transmission communication signals a synchronization control unit, a frequency control unit and a power control unit; and a second physical layer interface for said subscriber station for processing said communication signals upstream and downstream between said subscriber station and said base station, wherein said second physical layer interface transmits upstream transmission of communication signals from said subscriber station to said base station in a burst mode, and said first physical layer interface utilizes demand assigned multiple access communication protocol for receiving upstream transmission of communication signals; and wherein the downstream frames have a fixed length, including a synchronization byte and a configurable-length payload field; and wherein the upstream frames have a frame size programmable in predetermined time increments and the virtual frame boundaries are determined from a downstream frame start indicator.
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32. A physical layer interface system for use in a broadband wireless access communication network, said broadband wireless communication network comprising a base station, a subscriber station and a wireless communication link for transmitting wireless communication signals upstream and downstream between said base station and said subscriber station, said physical system comprising:
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a first physical layer interface for said base station for processing said communication signals upstream and downstream between said subscriber station and said base station, said first physical layer interface further comprises for said downstream transmission communication signals a synchronization control unit, a frequency control unit, a power control unit, an interfacing unit, an inversion and randomization unit, an encoding unit, a convolution interleaving unit, a convolution code puncturing and mapping unit, a baseband pulse shaping unit, and a downstream modulator and physical interface; wherein said interfacing unit, said inversion and randomization unit, said encoding unit, said convolution interleaving unit, said convolution code puncturing and mapping unit, said baseband pulse shaping unit and said downstream modulator and physical interface operate together to produce said downstream transmission from an encoded transmission produced by said base station; and a second physical layer interface for said subscriber station for processing said communication signals upstream and downstream between said subscriber station and said base station, wherein said second physical layer interface transmits upstream transmission of communication signals from said subscriber station to said base station in a burst mode, and said second physical layer interface further comprises a synchronization byte inversion unit for a synchronization byte associated with said encoded transmission and a transport stream packet randomizer, said synchronization byte further comprising a sync byte and a field for frame synchronization. - View Dependent Claims (33, 34)
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35. A physical layer interface system for use in a broadband wireless access communication network, said broadband wireless access communication network comprising a base station, a subscriber station and a wireless communication link for transmitting wireless communication signals upstream and downstream between said base station and said subscriber station, said upstream signals being transmitted in an upstream channel and said downstream signals being transmitted in a downstream channel, said upstream and downstream channels being frequency division multiplexed over the communication link, said physical interface system comprising a physical layer interface for processing said communication signals upstream and downstream between said subscriber station and said base station
wherein said downstream channel transmits said downstream signals in a continuous transmission using a time division multiplexing transmission protocol to encode its data, said upstream channel transmits said upstream signals using a time division multiple access protocol to encode its data, and said upstream channel transmits signals from said subscriber station in a burst mode; - and
wherein the downstream frames have a fixed length, including a synchronization byte and a configurable-length payload field; and wherein the upstream frames have a frame size programmable in predetermined time increments and the virtual frame boundaries are determined from a downstream frame start indicator. - View Dependent Claims (36)
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37. A physical layer interface system for use in a broadband wireless access communication network, said broadband wireless access communication network comprising a base station, a subscriber station and a wireless communication link for transmitting wireless communication signals upstream and downstream between said base station and said subscriber station, said physical interface system comprising a physical layer interface for said subscriber station for processing said communication signals upstream and downstream between said subscriber station and said base station;
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wherein said physical layer interface receives upstream transmission of communication signals from said subscriber station transmitted in a burst mode using a time division multiple access protocol and said physical layer interface transmits downstream transmission of said communication signals to said subscriber station using a time division multiplex protocol in continuous mode; and wherein said communication signals are transmitted as MPEG frames; and wherein an upstream frame occupies an integer number of mini-slots, a mini-slot being 4×
2n bytes and being the smallest time slot configurable in the upstream channel, wherein n is a configurable integer. - View Dependent Claims (38)
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39. A method of establishing communication across a broadband wireless access communication network between a base station and a subscriber station, said method comprising the steps of:
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at said base station broadcasting over a downstream channel a continuous stream of downstream frames to the subscriber station and receiving from the subscriber station a respective burst of upstream frames from the upstream channel; at the subscriber station, extracting the downstream frames addressed to the subscriber station and transmitting the respective burst of upstream frames in an assigned time-slot allocated in an upstream channel to the subscriber station; and frequency division multiplexing the upstream channel and the downstream channel, the downstream channel transporting the downstream frames between the base station and the subscriber station using a time division multiplexing transmission protocol, and the upstream channel transporting upstream frames between the subscriber station and the base station using a time division multiplexing access protocol or a demand assigned multiple access protocol, wherein the downstream frames have a defined fixed length, a preamble byte relating to a respective MAC protocol data units and a payload field, and wherein the upstream frames have a frame size programmable in predetermined time increments and the virtual frame boundaries are determined from a downstream frame start indicator. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46)
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47. A physical layer interface system for a broadband wireless access communication network that establishes communication between a base station and a plurality of fixed subscriber stations over a radio link using duplexing selected from the group consisting of TDD and FDD and including an upstream channel and a downstream channel, said downstream channel for transporting downstream frames from the base station to the subscriber stations, and said upstream channel for transporting frames from the subscriber stations to the base station, comprising:
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a first physical layer interface at said base station for broadcasting over said downstream channel a continuous string of downlink frames to all subscriber stations using a time division multiplexing (TDM) transmission protocol, and for receiving from each currently active subscriber station a burst of uplink frames over said upstream channel using demand assigned multiple access (DAMA) protocol; and a second physical layer interface at said subscriber station for transmitting a respective burst in an assigned time-slot allocated in said upstream channel using said DAMA protocol and for extracting the downstream frames addressed to the respective subscriber station; and wherein the downstream frames have a fixed length, including a synchronization byte and a configurable-length payload field; and wherein the upstream frames have a frame size programmable in predetermined time increments with virtual frame boundaries determined from a downstream frame start indicator. - View Dependent Claims (48)
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49. A base station physical layer interface for use in a broadband wireless access communication network that establishes communication between a base station and a plurality of fixed subscriber stations over a radio link including an upstream channel and a downstream channel, said downstream channel transporting downstream frames from the base station to the subscriber stations using a time division multiplexing (TDM) transmission protocol, and said upstream channel transporting upstream frames from the subscriber stations to the base station using a time division multiplexing access (TDMA) protocol, said base station physical layer interface broadcasting over said downstream channel a continuous string of downlink frames to all subscriber stations receiving from each currently active subscriber station a burst of uplink frames over said upstream channel, said base station physical interface comprising:
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an inversion and randomization unit; an encoding unit, a convolution interleaving unit, a convolution code puncturing and mapping unit, a baseband pulse shaping unit, and a downstream modulator and physical interface; and wherein said inversion and randomization unit, said encoding unit, said convolution interleaving unit, said convolution code puncturing and mapping unit, said baseband pulse shaping unit and said downstream modulator and physical interface operate together to produce said downstream frames from an encoded transmission produced by said base station, said downstream frames having a fixed length, including a synchronization byte and a configurable-length payload field; and wherein said base station physical layer interface further comprises a burst demodulator, a symbol de-mapper, a decoder and a derandomization unit that are operative to receive upstream frames. - View Dependent Claims (50, 51)
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52. A subscriber station physical layer interface for use in a broadband wireless access communication network that establishes communication between a base station and a plurality of fixed subscriber stations over a radio link including an upstream channel and a downstream channel, said downstream channel transporting downstream frames from the base station to the subscriber stations using a time division multiplexing (TDM) transmission protocol, and said upstream channel transporting upstream frames from the subscriber stations to the base station using a time division multiplexing access (TDMA) protocol, said subscriber station physical layer interface transmitting a burst of uplink frames over said upstream channel, said subscriber station physical interface comprising:
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a randomization unit, an encoder, a symbol mapper, and a modulator for transmitting over the upstream channel upstream frames having a frame size programmable in predetermined time increments with virtual frame boundaries determined from a downstream frame start indicator; and a demodulator, convolution decoder, convolution de-interleaver, and synchronization byte inversion and derandomization unit for receiving said downstream frames having a fixed length, including a synchronization byte and a configurable-length payload field, and recovering respective MAC-layer packets.
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Specification