US20070165578A1
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US
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Physical layer interface system and method for a wireless communication system
Assignee: Nokia Canada Inc
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Filing: 2007-03-23
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Granted: —
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Expires: 2027-03-23
Abstract
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 processing 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.
Inventors
- 👤 Jung Yee
- 👤 Jeff Foerster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:43
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2603; H04W; H04W80/00; H04W84/00; H04W84/02; H04W84/10; H04W84/14; H04W92/00; H04W92/04; H04W92/10
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
182 words
1 . A method of establishing communication across a broadband wireless access communication network between a base station and a subscriber station, said method comprising: at said base station, (a) broadcasting over a downstream channel physical layer downstream frames to the subscriber station and (b) receiving from the subscriber station a respective burst of physical layer upstream frames on an upstream channel; at the subscribes station, (c) extracting the downstream frames addressed to the subscriber station in said downstream channel and (d) transmitting to said base station the respective burst of upstream frames in assigned time-slots allocated to said subscriber station in the upstream channel; and (e) transmitting the upstream channel and the downstream channel between said base station and said subscriber station using a specified duplexing technique, wherein the downstream channel uses a time division multiplexing (TDM) transmission protocol, and the upstream channel uses a time division multiple access (TDMA) protocol, and wherein the downstream frames have a fixed length including a configurable-length payload field and a preamble field for enabling conversion of the downstream frames into/from MAC protocol data units.
Claim 2
Dependent Claim
182 words
1 . A method of establishing communication across a broadband wireless access communication network between a base station and a subscriber station, said method comprising: at said base station, (a) broadcasting over a downstream channel physical layer downstream frames to the subscriber station and (b) receiving from the subscriber station a respective burst of physical layer upstream frames on an upstream channel; at the subscribes station, (c) extracting the downstream frames addressed to the subscriber station in said downstream channel and (d) transmitting to said base station the respective burst of upstream frames in assigned time-slots allocated to said subscriber station in the upstream channel; and (e) transmitting the upstream channel and the downstream channel between said base station and said subscriber station using a specified duplexing technique, wherein the downstream channel uses a time division multiplexing (TDM) transmission protocol, and the upstream channel uses a time division multiple access (TDMA) protocol, and wherein the downstream frames have a fixed length including a configurable-length payload field and a preamble field for enabling conversion of the downstream frames into/from MAC protocol data units.
Claim 3
Dependent Claim
92 words
2 . A method as claimed in claim 1 , wherein step a) comprises: converting downstream data packets destined to said subscriber station from a respective protocol into said physical layer downstream frames; randomizing the data into said downstream frames for spectrum shaping; encoding the data into said downstream frames for enabling error correction; processing and shaping data into said downstream frames for enabling support of delay requirements and channel configurations; and modulating the data into said downstream frames and transmitting said downstream frames over said downstream channel to said subscriber station.
Claim 4
Dependent Claim
48 words
3 . A method as claimed in claim 2 , wherein step c) comprises: demodulating said downstream frames received over said downstream channel from said base station; and processing data obtained after demodulation by filtering, decoding and de-randomizing for reconstructing the user data carried by said downstream frames.
Claim 5
Dependent Claim
37 words
4 . A method as claimed in claim 1 , wherein said preamble data includes a synchronization byte and a header indicating that the data following said header is the beginning of a MAC protocol data unit.
Claim 6
Dependent Claim
55 words
5 . A method as claimed in claim 1 , wherein said preamble data includes a synchronization byte, a header for indicating that the payload field begins with a MAC protocol data unit continued from a previous frame, and a pointer for indicating the beginning of a MAC protocol data unit in said payload field.
Claim 7
Dependent Claim
22 words
6 . A method as claimed in claim 1 , wherein an upstream frame extends over a time range of 3-6 miliseconds.
Claim 8
Dependent Claim
107 words
7 . A method as claimed in claim 1 , wherein step (d) comprises: randomizing and thereafter encoding a MAC message of variable length into a codeword, wherein the length of the codeword and the error correction capability of the code are programmable by a burst configuration message received from the base station; adding a configurable length preamble and a configurable length guard space at the end of each burst processing and shaping data in said burst to obtain said upstream frames; and modulating the data into said upstream frames and transmitting said upstream frames over said upstream channel to said base station in said respective burst.
Claim 9
Dependent Claim
51 words
8 . A method as claimed in claim 7 , wherein step (b) comprises: demodulating the upstream frames received in said respective burst over said upstream channel from said subscriber station; processing data obtained after demodulation by filtering, decoding and de-randomizing for reconstructing the user data carried by said downstream frames.
Claim 10
Dependent Claim
24 words
9 . A method as claimed in claim 8 , wherein the time allocated for said burst is programmable in steps of 125 usec.
Claim 11
Dependent Claim
30 words
10 . A method as claimed in claim 1 , wherein the boundaries of said downstream frames are determined from a downstream frame start indicator received from said base station.
Claim 12
Dependent Claim
24 words
11 . A method as claimed in claim 1 , wherein the boundaries of said downstream frame are determined using a MAC management message.
Claim 13
Dependent Claim
22 words
12 . A method as claimed in claim 1 , wherein said preamble is programmable in length from 0 to 1024 bits.
Claim 14
Dependent Claim
62 words
13 . A method as claimed in claim 1 , wherein said burst has a plurality of programmable burst profiles, determined by one or more of: the modulation type used on said upstream channel, the length and pattern of said preamble, the length of the last codeword in the burst, the number of codewords in the burst, the seed used for randomization.
Claim 15
Dependent Claim
30 words
14 . A method as claimed in claim 13 , wherein said burst profiles are further determined by use or not of differential encoding and use or not of randomization.
Claim 16
Dependent Claim
39 words
15 . A method as claimed in claim 1 , further comprising synchronizing said upstream frame within a timeslot on said upstream channel with an output reference clock derived from a downstream symbol clock received from said base station.
Claim 17
Dependent Claim
62 words
16 . A method as claimed in claim 1 , wherein said upstream and said downstream channels are divided into equal and fixed length frames, wherein the beginning of each downstream frame is identified by a frame start indicator bit and the beginning of each upstream frame is a fixed offset from a downstream frame start message, programmed via a MAC message.
Claim 18
Dependent Claim
34 words
17 . A method as claimed in claim 1 , wherein said duplexing technique used in step (e) is selected from the group consisting of time division duplexing (TDD) and frequency division duplexing (FDD).
Claim 19
Dependent Claim
29 words
18 . A method as claimed in claim 1 , wherein said frequency division duplexing (FDD) technique supports half duplex subscriber stations (H-FDD) and full duplex (FDD) subscriber stations.
Claim 20
Dependent Claim
37 words
19 . A method as claimed in claim 17 , wherein in the case of TDD, one radio channel carries booth upstream and downstream frames and control data between said base station and said subscriber station uses.
Claim 21
Dependent Claim
33 words
20 . A method as claimed in claim 17 , wherein in the case of FDD a first radio channel carries the upstream frames and a second radio channel carries the downstream frames.
Claim 22
Dependent Claim
27 words
23 . A method as claimed in claim 1 , wherein said base station operates in a burst mode, for transmitting said downstream frames in downstream bursts.
Claim 23
Dependent Claim
133 words
24 . A method of establishing communication across a broadband wireless access communication network between a base station and a plurality of subscriber stations, said method comprising: providing upstream and downstream channels using a duplexing technique; in a downstream direction at the base station, preparing downstream MAC protocol data units for transmission to said subscriber stations; mapping said MAC protocol data units into downstream frames; and time division multiplexing said downstream data frames onto a data stream in said downstream channel for transmission to each of said subscriber stations; and in an upstream direction at each subscriber station; preparing upstream data packets for transmission to said base station; and transmitting said upstream data packets to said base station over said upstream channel in bursts in accordance with a time division multiple access protocol.
Claim 24
Dependent Claim
133 words
24 . A method of establishing communication across a broadband wireless access communication network between a base station and a plurality of subscriber stations, said method comprising: providing upstream and downstream channels using a duplexing technique; in a downstream direction at the base station, preparing downstream MAC protocol data units for transmission to said subscriber stations; mapping said MAC protocol data units into downstream frames; and time division multiplexing said downstream data frames onto a data stream in said downstream channel for transmission to each of said subscriber stations; and in an upstream direction at each subscriber station; preparing upstream data packets for transmission to said base station; and transmitting said upstream data packets to said base station over said upstream channel in bursts in accordance with a time division multiple access protocol.
Claim 25
Dependent Claim
30 words
25 . A method as claimed in claim 24 , wherein said downstream frames include a pointer field indicating the start of a MAC protocol data unit in its payload.
Claim 26
Dependent Claim
150 words
26 . A method of establishing communication across a broadband wireless access communication network between a base station and a plurality of subscriber stations, said method comprising: providing upstream and downstream channels using a duplexing technique; in a downstream direction at the base station, preparing downstream packets for transmission to said subscriber stations; mapping said downstream packets into downstream frames; and time division multiplexing said downstream data frames onto a data stream in said downstream channel for transmission to each of said subscriber stations; and in an upstream direction at each subscriber station; preparing upstream data packets for transmission to said base station; and transmitting said upstream data packets to said base station over said upstream channel in bursts in accordance with a time division multiple access protocol; and wherein said upstream channel is divided into virtual frames for which the frame boundaries are determined by a downstream start indicator.
Claim 27
Dependent Claim
150 words
26 . A method of establishing communication across a broadband wireless access communication network between a base station and a plurality of subscriber stations, said method comprising: providing upstream and downstream channels using a duplexing technique; in a downstream direction at the base station, preparing downstream packets for transmission to said subscriber stations; mapping said downstream packets into downstream frames; and time division multiplexing said downstream data frames onto a data stream in said downstream channel for transmission to each of said subscriber stations; and in an upstream direction at each subscriber station; preparing upstream data packets for transmission to said base station; and transmitting said upstream data packets to said base station over said upstream channel in bursts in accordance with a time division multiple access protocol; and wherein said upstream channel is divided into virtual frames for which the frame boundaries are determined by a downstream start indicator.
References Cited (Backward Citations)
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