CA2727829A1 - Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system - Google Patents

Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system Download PDF

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Publication number
CA2727829A1
CA2727829A1 CA2727829A CA2727829A CA2727829A1 CA 2727829 A1 CA2727829 A1 CA 2727829A1 CA 2727829 A CA2727829 A CA 2727829A CA 2727829 A CA2727829 A CA 2727829A CA 2727829 A1 CA2727829 A1 CA 2727829A1
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Canada
Prior art keywords
packet
mac
bandwidth
subscriber unit
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2727829A
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French (fr)
Other versions
CA2727829C (en
Inventor
Jacques Behar
Gary Lee Samad, Jr.
Kenneth L. Stanwood
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Quarterhill Inc
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WiLAN Inc
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Application filed by WiLAN Inc filed Critical WiLAN Inc
Priority to CA2759770A priority Critical patent/CA2759770C/en
Publication of CA2727829A1 publication Critical patent/CA2727829A1/en
Application granted granted Critical
Publication of CA2727829C publication Critical patent/CA2727829C/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Abstract

The present invention is a novel method and apparatus for efficiently transporting and synchronizing data between the Media Access Control (MAC) and physical communication protocol layers in a wireless communication system. Depending on the length of the MAC packet to be transported, the present invention either fragments or concatenates the MAC packet when mapping to the physical layer. When a MAC packet is too long to fit in one TC/PHY packet, the MAC packet is fragmented and the resultant multiple TC/PHY packets are preferably transmitted back-to-back within the same TDD frame. When a MAC packet is shorter than a TC/PHY packet, the next MAC packet is concatenated with the current MAC packet into a single TC/PHY packet unless an exception applies (e.g., a change in CPE on the uplink or a change in modulation on the downlink). When an exception applies, the next MAC packet is started on a new TC/PHY packet following either a CTG or MTG.

Claims (38)

1. A method of re-synchronizing data in a wireless communication system, wherein the wireless communication system includes a plurality of customer premise equipment (CPE) in communication with associated and corresponding base stations, and wherein the base stations maintain uplink and downlink sub-frame maps representative of bandwidth allocations in uplink and downlink communication links, and wherein the base stations each include an associated and corresponding media access control (MAC) having a plurality of MAC data messages, and wherein the MAC transports a MAC data message through a MAC
data packet that is mapped to at least one TC/PHY packet in a layered data transport architecture, and wherein the each TC/PHY packet includes a header present field, and wherein at least one of the communication links may be disrupted during data transmission, the method comprising the steps of:

(a) detecting a disruption of a communication link during data transmission;

(b) reestablishing the communication link that was detected as disrupted at step (a);
(c) receiving a TC/PHY packet;

(d) detecting the header present field of the TC/PHY packet received at step (c), and if data in the header present field indicates the presence of a particular kind of data within a payload of said TC/PHY packet, proceeding to step (e), else returning to step (c); and (e) resuming data transmission on the disrupted communication link, wherein at most only one MAC data message is lost after reestablishing the communication link in step (b).
2. A method of synchronizing data in a wireless communication network where a base station communicates with a plurality of subscriber units over a communication link, comprising:

receiving media access control (MAC) packets mapped into transmission convergence (TC) packets over the communication link;

detecting a header present (HP) message within a TC packet, indicating that the TC packet carries a header of a MAC packet; and processing the MAC packets received in the TC packets starting from the header of the MAC packet when transmission over the communication link is resumed after an interruption, wherein one MAC packet is lost prior to detecting the HP
message.
3. The method of claim 2, wherein the HP message occupies a single bit field in the header of the transmission convergence packet.
4. The method of claim 2, wherein a logical "one" HP message indicates the presence the MAC packet in the transmission convergence packet.
5. The method of claim 2, wherein the MAC packet has a variable length.
6. The method of claim 3, wherein the header of the TC packet also provides a position field which indicates the byte position within the payload of the TC packet at which the MAC
packet begins.
7. The method of claim 6, wherein the position field is 5 bits in length.
8. A base station for a wireless communication network comprising:

a transmitter adapted to exchange physical (PHY) layer messages with a plurality of subscriber units over a communication link and to convert the PHY messages into and from transmission convergence (TC) packets; and transmission convergence means for converting transmission convergence (TC) packets into and from media access (MAC) packets, wherein a TC packet carries a header present (HP) field indicating that it carries a beginning of a MAC packet.
9. A base station as claimed in claim 8, wherein the HP field is provided in the header of each TC packet.
10. A base station as in claim 8, wherein the HP field is one bit long.
11. A base station as in claim 10, wherein a logical "one" in the HP field indicates that the TC packet contains the beginning of the MAC packet.
12. The base station of claim 9, wherein the header of the TC packet also provides a position field which indicates the byte position within the payload of the TC
packet at which the MAC packet begins.
13. The base station of claim 8, wherein the transmitter includes means for determining a signal quality measurement for the PHY messages received from a subscriber unit.
14. The base station of claim 13 wherein the signal quality measurement is used for establishing an uplink modulation scheme to be used by the subscriber unit for transmission of PHY messages to the base station.
15. The base station of claim 13, wherein the signal quality measurement is the bit error rate (BER), and the modulation scheme is established based on an acceptable BER value for uplink transmission from the subscriber unit.
16. The base station of claim 13, further comprising MAC means for converting packets of various formats into and from media access (MAC) packets.
17. The base station of claim 15, wherein the MAC means determine the bandwidth allocation for the subscriber unit based on the modulation scheme established for the subscriber unit.
18. The base station of claim 15, wherein the MAC means determine the bandwidth allocation for the subscriber unit based on a bandwidth request received from the subscriber unit
19. A method of claim 6, wherein the base station determines a signal quality measurement for the PHY messages received from a subscriber unit.
20. A method for dynamically allocating UL bandwidth in a base station for a broadband wireless communication system where the base station exchanges uplink (UL) and downlink (DL) traffic with one or more subscriber units, the method comprising:

maintaining at the base station a DL map and a UL map with a current DL
bandwidth allocations and UL bandwidth allocations and periodically transmitting the maps to the subscriber units;

identifying within the UL traffic received from a subscriber unit, a bandwidth request specifying a requested amount of UL bandwidth; and updating the UL map to accommodate the requested amount of UL bandwidth whenever there is sufficient UL bandwidth available for accommodating the requested amount of UL bandwidth.
21. A method as claimed in claim 20, wherein the bandwidth request is provided to the base station in response to a polling action initiated by the base station.
22. A method as claimed in claim 21, wherein the polling action provides the subscriber unit with uplink bandwidth to be used by the subscriber unit to transmit the bandwidth request.
23. A method as claimed in claim 21, wherein the polling action is performed individually on selected subscriber units.
24. A method as claimed in claim 21, wherein the polling action is performed on a group of subscriber units.
25. A method as claimed in claim 21, wherein the bandwidth request received at the base station in response to the polling action uses a modulation scheme currently used by that subscriber unit for data transmission.
26. A method as claimed in claim 21, wherein the polling action is performed at a polling rate determined by the base station using a plurality of traffic parameters.
27. A method as claimed in claim 26 , wherein the poling rate changes as the traffic parameters change.
28. A method as claimed in claim 26, wherein the traffic parameters include one or more of. the QoS required by u ser connections established with the subscriber unit; the rate of recent bandwidth usage associated with the subscriber unit, and a traffic priority contractually negotiated with the subscriber unit.
29. A subscriber unit for a broadband wireless communication system comprising:
a transmitter; and a Media Access Control (MAC) module configured to provision a bandwidth request pertaining to a connection established at the subscriber unit, receive an uplink (UL) bandwidth grant for the connection, and allocate the UL bandwidth grant to at least one of a plurality of connections established at the subscriber unit.
30. A subscriber unit as claimed in claim 29, wherein the UL bandwidth grant is specified in a UL frame map received by the subscriber unit.
31. A subscriber unit as claimed in claim 29, wherein the UL bandwidth grant is based on a type of service established for the specified connection.
32. A subscriber unit s as claimed in claim 29, wherein the UL bandwidth grant is based on a quality of service required by at least one of a plurality of user connections served by the subscriber unit.
33. A subscriber unit s as claimed in claim 29, wherein the UL bandwidth grant is based on an estimated amount of bandwidth needed to accommodate bandwidth requests.
34. A subscriber unit s as claimed in claim 27, wherein the UL bandwidth grant is allocated between connections based on a type of service established for each connection.
35. A subscriber unit for a broadband wireless communication system comprising:
transmit and receive circuitry; and a Media Access Control (MAC) module configured to transmit an explicit message requesting a polling opportunity for enabling the subscriber unit to request UL bandwidth, receive a polling opportunity as a given amount of UL bandwidth, and provision a bandwidth request within the given amount of UL bandwidth, the BW request specifying a requested amount of UL bandwidth pertaining to a specified connection established at the subscriber unit .
36. A subscriber unit s as claimed in claim 35, wherein the MAC module is further configured to receive a UL bandwidth grant identified in a UL frame map.
37. A subscriber unit s as claimed in claim 36, wherein the explicit message is a poll-me message.
38. A subscriber unit s as claimed in claim 37, wherein the poll-me message is a particular combination of bits provided in a reserved field of a packet.
CA2727829A 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system Expired - Lifetime CA2727829C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2759770A CA2759770C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/430,379 1999-10-29
US09/430,379 US6683866B1 (en) 1999-10-29 1999-10-29 Method and apparatus for data transportation and synchronization between MAC and physical layers in a wireless communication system
CA2569688A CA2569688C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system

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Related Child Applications (1)

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CA2727829A1 true CA2727829A1 (en) 2001-05-10
CA2727829C CA2727829C (en) 2012-10-02

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CA2727829A Expired - Lifetime CA2727829C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2569688A Expired - Lifetime CA2569688C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2879747A Expired - Lifetime CA2879747C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2897202A Expired - Lifetime CA2897202C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communcation system
CA2759770A Expired - Lifetime CA2759770C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2847074A Expired - Lifetime CA2847074C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA002387761A Expired - Lifetime CA2387761C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system

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CA2569688A Expired - Lifetime CA2569688C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2879747A Expired - Lifetime CA2879747C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2897202A Expired - Lifetime CA2897202C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communcation system
CA2759770A Expired - Lifetime CA2759770C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA2847074A Expired - Lifetime CA2847074C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system
CA002387761A Expired - Lifetime CA2387761C (en) 1999-10-29 2000-10-26 Method and apparatus for data transportation and synchronization between mac and physical layers in a wireless communication system

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US (2) US6683866B1 (en)
EP (1) EP1226685A1 (en)
JP (6) JP4549599B2 (en)
KR (2) KR100675235B1 (en)
CN (1) CN1387715A (en)
AU (1) AU1349701A (en)
BR (1) BR0015032A (en)
CA (7) CA2727829C (en)
WO (1) WO2001033772A1 (en)

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