Source: http://www.google.com/patents/US8031711?ie=ISO-8859-1&dq=2040248
Timestamp: 2014-07-10 14:51:48
Document Index: 376000746

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'art 16', 'art 16', 'art 16', 'art 16']

Patent US8031711 - Assignment modes for a shared communication medium - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsMethods and apparatuses are presented for conducting communications over a shared communication medium involving (a) sending a request from a first node, the shared communication medium organized to include (i) a request signal space including a plurality of request segments each having a different location...http://www.google.com/patents/US8031711?utm_source=gb-gplus-sharePatent US8031711 - Assignment modes for a shared communication mediumAdvanced Patent SearchPublication numberUS8031711 B2Publication typeGrantApplication numberUS 11/771,910Publication dateOct 4, 2011Filing dateJun 29, 2007Priority dateFeb 6, 2007Also published asEP2115896A1, EP2119043A1, EP2119044A1, EP2119045A1, EP2119046A2, US7710876, US7715319, US7756077, US7822010, US20080186855, US20080186856, US20080186857, US20080186859, US20080186860, US20080186861, US20080186940, US20080186975, US20080186994, US20080186997, US20080187002, US20080187003, WO2008098063A1, WO2008098064A1, WO2008098068A1, WO2008098071A1, WO2008098073A2, WO2008098073A3Publication number11771910, 771910, US 8031711 B2, US 8031711B2, US-B2-8031711, US8031711 B2, US8031711B2InventorsDonald W. BeckerOriginal AssigneeViasat, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (107), Non-Patent Citations (81), Classifications (8), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetAssignment modes for a shared communication mediumUS 8031711 B2Abstract Methods and apparatuses are presented for conducting communications over a shared communication medium involving (a) sending a request from a first node, the shared communication medium organized to include (i) a request signal space including a plurality of request segments each having a different location within the request signal space and (ii) a scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the request sent in a request segment, (b) obtaining an assignment associating the request with a scheduled transmission segment, the assignment taking into account location of the request within the request signal space, and (c) from the first node, sending a data transmission in the scheduled transmission segment associated with the request in accordance with the assignment.
(a) sending a symbol-level request for assignment of a scheduled transmission segment for a data transmission, the symbol-level request sent from a first node in the plurality of nodes, the shared communication medium organized to include a request signal space and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the symbol-level request sent in a request segment that is one of the plurality of request segments;
(b) at the first node, making the assignment associating the symbol-level request with the scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment made locally at the first node in response to the symbol-level request and one or more other symbol-level requests detected at the first node, the one or more other symbol-level requests sent from one or more nodes in the plurality of nodes, the assignment taking into account location of the symbol-level request within the request signal space; and
(c) from the first node, sending the data transmission in the scheduled transmission segment associated with the symbol-level request in accordance with the assignment,
wherein the plurality of nodes comprises a mixture of nodes operating under different assignment modes, the mixture of nodes comprising:
a node operating under a first assignment mode, wherein the node obtains an assignment made remotely at another node in response to one or more symbol-level requests received at the other node;
a node operating under a second assignment mode, wherein the node makes an assignment locally in response to one or more symbol-level requests detected at the node operating under the second assignment mode, without taking into account information communicated from the other node; and
a node operating under a third assignment mode, wherein the node makes an assignment locally in response to one or more symbol-level requests detected at the node operating under the third assignment mode, taking into account information communicated from the other node.
2. The method of claim 1 wherein the assignment also takes into account information communicated from a second node in the plurality of nodes in response to one or more symbol-level requests detected at the second node.
3. The method of claim 2 wherein the information communicated from the second node comprises an assignment message.
4. The method of claim 3 wherein the first node maintains a local data transmission queue based on assignment messages received at the first node.
5. The method of claim 4 wherein the first node recognizes an entry in the local data transmission queue as being associated with the symbol-level request sent from the first node and sends the data transmission.
6. The method of claim 4 wherein the second node periodically broadcasts synchronization messages for synchronizing the local data transmission queue maintained at the first node to a data transmission queue maintained at the second node.
7. The method of claim 1 wherein the symbol-level request occupies one symbol.
8. The method of claim 1 wherein the symbol-level request is a code word.
9. An apparatus for conducting communications over a shared communication medium involving a plurality of nodes, comprising:
(a) a first node configured to send a symbol-level request for assignment of a scheduled transmission segment for a data transmission, the symbol-level request sent over the shared communication medium, the shared communication medium organized to include a request signal space and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the first node configured to send the symbol-level request in a request segment that is one of the plurality of request segments;
(b) wherein the first node is configured to make the assignment associating the symbol-level request with the scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment made locally at the first node in response to the symbol-level request and one or more other symbol-level requests detected at the first node, the one or more other symbol-level requests sent from one or more nodes in the plurality of nodes, the assignment taking into account location of the symbol-level request within the request signal space; and
(c) wherein the first node is configured to send the data transmission in the scheduled transmission segment associated with the symbol-level request in accordance with the assignment,
10. The apparatus of claim 9 wherein the assignment also takes into account information communicated from a second node in the plurality of nodes in response to one or more symbol-level requests detected at the second node.
11. The apparatus of claim 10 wherein the information communicated from the second node comprises an assignment message.
12. The apparatus of claim 11 wherein the first node is configured to maintain a local data transmission queue based on assignment messages received at the first node.
13. The apparatus of claim 12 wherein the first node is configured to recognize an entry in the local data transmission queue as being associated with the symbol-level request sent from the first node and sends the data transmission.
14. The apparatus of claim 12 wherein the second node is configured to periodically broadcast synchronization messages for synchronizing the local data transmission queue maintained at the first node to a data transmission queue maintained at the second node.
15. The apparatus of claim 9 wherein the symbol-level request occupies one symbol.
16. The apparatus of claim 9 wherein the symbol-level request is a code word.
CROSS-REFERENCES TO RELATED APPLICATIONS The present application claims benefit of priority under 35 U.S.C. 119(e) of U.S. provisional Application No. 60/888,451, filed on Feb. 6, 2007, entitled �Symbol Oriented Reservation Request System For Controlling Access To A Shared Communications Link,� Client Reference No. VS-0239-US, the content of which is incorporated herein by reference in its entirety.
The present application also claims benefit of priority under 35 U.S.C. 119(e) of U.S. provisional Application No. 60/895,143, filed on Mar. 16, 2007, entitled �Blip and Burst Multiple Access,� Client Reference No. VS-0242-US, the content of which is incorporated herein by reference in its entirety.
U.S. Nonprovisional patent application Ser. No. 11/771,762, filed Jun. 29, 2007 for �Reservation Request System for Controlling Access to a Shared Communication Medium� (Client Reference No. VS-0242-US-2). U.S. Nonprovisional patent application Ser. No. 11/771,798, filed Jun. 29, 2007 for �Time Multiplexed Requests for Controlling Access to a Shared Communication Medium� (Client Reference No. VS-0253-US). U.S. Nonprovisional patent application Ser. No. 11/771,810, filed Jun. 29, 2007 for �Code Multiplexed Requests for Controlling Access to a Shared Communication Medium� (Client Reference No. VS-0254-US). U.S. Nonprovisional patent application Ser. No. 11/771,828, filed Jun. 29, 2007 for �Contention and Polled Requests for Scheduling Transmissions� (Client Reference No. VS-0255-US). U.S. Nonprovisional patent application Ser. No. 11/771,840, filed Jun. 29, 2007 for �Request Signal Designs for Multiple Service Types� (Client Reference No. VS-0256-US). U.S. Nonprovisional patent application Ser. No. 11/771,856, filed Jun. 29, 2007 for �Default Assignment of Scheduled Transmissions� (Client Reference No. VS-0257-US). U.S. Nonprovisional patent application Ser. No. 11/771,870, filed Jun. 29, 2007 for �Successive Scheduled Requests for Transmission� (Client Reference No. VS-0258-US). U.S. Nonprovisional patent application Ser. No. 11/771,882, filed Jun. 29, 2007 for �Piggyback Requests in Scheduled Transmissions� (Client Reference No. VS-0259-US). U.S. Nonprovisional patent application Ser. No. 11/771,894, filed Jun. 29, 2007 for �Robust and Efficient Assignment of Scheduled Transmissions� (Client Reference No. VS-0260-US). U.S. Nonprovisional patent application Ser. No. 11/771,903, filed Jun. 29, 2007 for �Request Detection Error Processing� (Client Reference No. VS-0261-US). U.S. Nonprovisional patent application Ser. No. 11/771,910, filed Jun. 29, 2007 for �Assignment Modes for a Shared Communication Medium� (Client Reference No. VS-0262-US). U.S. Nonprovisional patent application Ser. No. 11/771,926, filed Jun. 29, 2007 for �Reservation Request Improvements� (Client Reference No. VS-0263-US). BACKGROUND OF THE INVENTION In many applications, a communication medium is shared among a number of nodes. The nodes compete with one another for access to the shared communication medium. At any given moment, there may be more than one of the nodes that wish to transmit data over the shared communication medium. A system is typically put in place to facilitate access to the shared communication medium by the various nodes. Various categories of such multiple access systems have been developed.
BRIEF SUMMARY OF THE INVENTION The present invention relates to methods and apparatuses for conducting communications over a shared communication medium involving a plurality of nodes, involving (a) sending a request from a first node in the plurality of nodes, the shared communication medium organized to include a request signal space and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the request sent in a request segment that is one of the plurality of request segments, (b) obtaining an assignment associating the request with a scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment taking into account location of the request within the request signal space, and (c) from the first node, sending a data transmission in the scheduled transmission segment associated with the request in accordance with the assignment.
In one embodiment, the assignment is made locally at the first node in response to requests received at the first node. The assignment may also take into account information communicated from a second node in the plurality of nodes in response to requests received at the second node. The information communicated from the second node may comprise an assignment message.
In another embodiment, the assignment is made remotely at a second node in the plurality of nodes in response to the request as received at the second node, and a corresponding assignment message is communicated to the first node. The plurality of nodes may comprise a mixture of nodes operating under different assignment modes. For example, the mixture of nodes may comprise (a) a node operating under a first assignment mode, wherein the node obtains an assignment made remotely at another node in response to requests received at the other node, (b) a node operating under a second assignment mode, wherein the node obtains an assignment made locally in response to requests received at the node operating under the second assignment mode, without taking into account information communicated from the other node, and (c) a node operating under a third assignment mode, wherein the node obtains an assignment made locally in response to requests received at the node operating under the third assignment mode, taking into account information communicated from the other node.
According to various embodiments of the invention, the shared communication medium utilized by access nodes 104, 106, 108, and 110 may be organized into a request signal space and a scheduled transmission signal space. Just as an example, the shared communication medium may be implemented as a satellite �return-link� that allows signals to be sent from access nodes 104, 106, 108, and 110 to scheduler node 102.
In addition, a feedback signal space may be utilized for sending the assignment messages from scheduler node 102 to access nodes 104, 106, 108, and 110. In the present embodiment of the invention, the feedback space is not a part of the shared communication medium. Continuing with a satellite system example, the feedback signal space may be implemented as a satellite �forward-link� that allows signals to be sent from scheduler node 102 to access nodes 104, 106, 108, and 110. This satellite �forward-link� may be separate from the �return-link� mentioned previously.
The entire request and assignment process takes place in an anonymous manner with respect to the identity of the access nodes, according to an embodiment of the invention. Thus, a symbol-level request sent from an access node does not explicitly identify the access node. For example, assume that access node 104 sent the symbol-level request in �REQ 0:7�(Slot 7 of the request signal space of Frame 0). This symbol-level request is merely a symbol transmitted at a particular location within the request symbol space. The symbol-level request does not explicitly identify the access node 104. Similarly, the corresponding assignment message �REQ 0:7, SCH 13� broadcast from scheduler node 102 does not explicitly identify access node 104 as the intended recipient of the assignment message. Instead, the assignment message merely announces that the symbol-level request sent in the �REQ 0:7� slot has been assigned to the scheduled transmission segment �SCH 13.� All of the access nodes 104, 106, 108, and 110 receive the broadcast assignment message. However, only access node 104 accepts the assignment and proceeds to send a data transmission in the scheduled transmission segment identified by the assignment. This is possible because each access node keeps track of the location(s) of the symbol-level request(s) it has sent. Access node 104 recognizes the request �REQ 0:7� identified in the assignment as one of its own and thus accepts the assignment. The other access nodes 106, 108, and 110 do not recognize the request �REQ 0:7� identified in the assignment as one of their own and thus do not accept the assignment.
FIG. 5 and other figures depict an assignment message under a �robust FIFO schedule mode,� in accordance with one embodiment of the invention. As mentioned previously, in this mode, each assignment message explicitly includes a pair of data: (1) an identifier for the request and (2) an identifier for the scheduled transmission segment associated with the request. In other words, the pairing of a request to an associated scheduled transmission segment is directly stated in the assignment message. For example, as shown in FIG. 5, the first assignment message includes the pair of data �REQ 0:7, SCH 13.� This indicates that the request sent in the request segment known as �REQ 0:7� (the request segment located at Frame 0, Slot 7) has been assigned the scheduled transmission segment known as �SCH 13� (the scheduled transmission segment located in Frame 13).
According to another embodiment of the present invention, when an access node such as 104, 106, 108, and 110 sends a symbol-level request, the access node utilizes a defined schedule to select a request segment from the plurality of available request segments. The defined schedule specifies the request segments available to each access node. In this sense, the defined schedule �polls� each access node to send its request in the appropriate request segment. Again, the request segments may be organized in the request signal space based on time-division multiplexing, frequency-division multiplexing, code-division multiplexing, and/or other multiplexing techniques. In particular, the use of code-division multiplexing in the request signal space is associated with significant benefits, as discussed previously.
According to an embodiment of the invention, a request may be sent from an access node such as 104, 106, 108, and 110 as a �piggyback request.� Here, a piggyback request refers to a request that is included in a portion of a data transmission sent from a node in a scheduled transmission segment. Thus, unlike a request sent in a request segment in the request signal space, a piggyback request is sent as part of a data transmission, such as in a header of the data transmission, sent in a scheduled transmission segment in the scheduled transmission signal space. This technique may improve efficiency by allowing a request to �hitch a ride� on a scheduled transmission, thus obviating the use a separate transmission in the request signal space.
Different assignment modes may be adopted according to various embodiments of the invention. These may include a �scheduler mode,� a �no scheduler mode,� and a �hybrid mode.� Here, a �scheduler mode� refers to a mode of operation in which access nodes rely on a scheduler node to determine the assignment of scheduled transmission segments. Previous sections have described examples under the �scheduler mode.�
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No. 11/771,926 mailed on Sep. 17, 2010; 15 pages.81Tallal O; "Mac Architecture for Broadband satellite access system" Apr. 20, 2000 at URL http///users.encs.concordia.ca/{tahar/theses/Tallal-Thesis.pdf.Classifications U.S. Classification370/390International ClassificationH04L12/28Cooperative ClassificationH04W72/1273, H04W72/1284, H04B7/18582, H04W84/06European ClassificationH04W72/12D4, H04B7/185S6Legal EventsDateCodeEventDescriptionMay 9, 2012ASAssignmentOwner name: UNION BANK, N.A., CALIFORNIAFree format text: SECURITY AGREEMENT;ASSIGNOR:VIASAT, INC.;REEL/FRAME:028184/0152Effective date: 20120509Jul 5, 2007ASAssignmentOwner name: VIASAT, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BECKER, DONALD W.;REEL/FRAME:019517/0770Effective date: 20070628RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google