Source: http://www.google.com/patents/US7194010?dq=%22peter+l+basel%22+%22lsi+logic%22
Timestamp: 2016-06-30 18:00:26
Document Index: 610708522

Matched Legal Cases: ['application No. 10', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US7194010 - Wireless base station to base station synchronization in a communication ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsIn a network, a method is disclosed for wirelessly exchanging communications with at least one mobile unit. The network includes first and second base stations units coupled to the network, and may include a system controller. The method includes: receiving a communication signal from the second base...http://www.google.com/patents/US7194010?utm_source=gb-gplus-sharePatent US7194010 - Wireless base station to base station synchronization in a communication system, such as a system employing a short range frequency hopping or time division duplex schemeAdvanced Patent SearchPublication numberUS7194010 B2Publication typeGrantApplication numberUS 10/139,609Publication dateMar 20, 2007Filing dateMay 2, 2002Priority dateMay 2, 2001Fee statusPaidAlso published asUS20020177460Publication number10139609, 139609, US 7194010 B2, US 7194010B2, US-B2-7194010, US7194010 B2, US7194010B2InventorsJames Beasley, Dennis Dombrowski, Matthew Kuiken, Wade Mergenthal, Spencer StephensOriginal AssigneeStrix Systems, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (80), Non-Patent Citations (51), Referenced by (30), Classifications (22), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetWireless base station to base station synchronization in a communication system, such as a system employing a short range frequency hopping or time division duplex scheme
US 7194010 B2Abstract
a radio environment monitoring component for monitoring links with mobile units, configured to operate below a Host Controller Interface (“HCI”) under a Bluetooth protocol;
a service discovery protocol (“SDP”);
This application claims the benefit of U.S. Provisional Patent Application Nos. 60/288,296 and No. 60/288,294 both filed May 2, 2001; and No. 60/333,844 and No. 60/333,885, both filed Nov. 28, 2001; and this application is a continuation-in-part of U.S. patent application No. 10/052,910 now U.S. Pat. No. 7,016,325 and PCT Application No. US02/01559, both filed Jan. 18, 2002.
A large circle 107 represents the maximum range of communication between these two devices at a given transmission power class—the “domain” of the BSU. While the maximum range limits the coverage of a single BSU, a Pocket Mobility Network (“PMN”) system employs multiple distributed BSUs to cover a large region. In general, a cellular communications network typically consists of a collection of base stations, where the base stations provide wireless access points for mobile users to obtain a communication link to a wide range of information and communication services. Each base station is set to reside in one stationary “cell.”The cells have some geographical overlap and collectively provide coverage to a particular area, typically encompassing many cells.
Pattern 1: 0123456789 TRTRTRTRTR or Pattern 2: 0123456789 RTRTRTRTRT where the “T” represents a time slot in which the BSU can start a transmission, where “R” represents a time slot in which the BSU can receive from a slave and where numbers 0–9 simply represent sequential slots. (In the discussion below, an MU is discussed, even though any “slave” may be employed.)
Initial base station synchronization can be done at PMN initialization time during base station neighbor discovery. During normal system operation base stations may communicate with each other the “backend network,” noted above.
Thus, base stations may identify one another, and particularly neighboring base stations, by employing the backend network. Alternatively, base stations may be able to automatically identify their neighbors as described in greater detail in U.S. Provisional Patent Application No. 60/262,558, filed May 2, 2001. In one embodiment, base station synchronization uses dedicated radio transmit slots to communicate directly, e.g., over the air, with other base stations. In one embodiment, a predefined number (e.g., 64) transmit/receive (TX/RX) slot pairs are used, with 128 total slots available for base station synchronization. These slots may also be shared with the base station remote MU monitoring function, where “unconverted Rx slots” per cycle are when the BSU will monitor the signal strength of MUs.
1. chooses to use, in this example, slot 1 to broadcast its sync information 2. records its sync client information as “0.0” 3. records its sync server information as “1.B4.1” (wave 1, its unique address (shown here simply as “B4”), slot 1) 4. begins broadcasting its synchronization information on its assigned slot To continue the water analogy, the ripple now begins to spread as BSU's B3, B7, and B8 each simultaneously and asynchronously try to discover their neighbors and get their own synchronization slot assignment. FIG. 10 also shows one of several possible outcomes of who synchronizes whom during Wave 1. Assume that B3 is the first non-seed base station to get synchronized, followed by B7, and then by B8. Thus, under Wave 1, the following occurs.
1. B3 sends B4, and each of B3's neighbors thus far, a “lock request” message so that no other base stations can simultaneously be getting or selecting the same slot. A lock request is similar to a software mutex (i.e., a software lock that indicates to other BSUs that the slot is assigned to that particular requesting BSU, and that other BSUs are locked out of using that slot until it is released by the requesting BSU). The lock request allows only one BSU at a time to perform synchronization, thereby locking out other BSUs from attempting to simultaneously synchronize. Each BSU may, for example, record a table of slots locked by other BSUs in earlier waves. Alternatively, as described herein, each BSU may simply record sync client information that includes slots locked by neighboring BSUs. 2. B4 returns a “lock granted” message to B3 along with any neighbor's neighbors and their synchronization slots (not established yet under this example). B4 (indeed each of B3's neighbors) will receive a lock-request message. Unless it is already engaged in a similar transaction with another BSU, B4 will return a lock-granted message. In that message it tells B3 all the Tx slots that it (i.e. B4) already knows about as being in use, due to it's (i.e. B4's) neighbors. B3 needs this neighbor's neighbor information to pick a slot that won't conflict. The reasoning is that all of B3's geographic neighbors (e.g. within 17 meters or so when used with mobile units having a 10 meter range) got discovered during Neighbor Discovery, so any slots they use are off limits for B3 to choose as its Tx slot. Then, to cover the case where one BSU's sync broadcast might “carry” farther than normal, the system also disallows any slots in use by any of B4's neighbors' neighbors (which in the example above could be as much as 34 meters or so away from B4). Only when it has all this occupied-slot info can B4 pick a slot that will not collide with one of its neighbors or one of its neighbors' neighbors. Another reason is to ensure that each neighbor can receive from each of its neighbors. If any BSU has two neighbors transmitting on the same slot, it may not be able to hear either one. For example, if B3 chooses and transmits on slot 3, but B8 has already chosen to transmit on slot 3, then intermediate neighbor B7 (which is a neighbor to both B3 on one side, and B8 on the other) will not be able to hear either B3 or B8 if they both transmit on slot 3. 3. This lock/acknowledge interaction is repeated for all remaining B3 neighbors. If any are already locked by another base station, the BSU waits until it is unlocked, then lock it, or selects another slot. 4. B3 realizes that B4 has slot 1 and that no other neighbors are synchronized yet; therefore, B3 chooses an available slot e.g., slot 3. 5. B3 records its sync client information as “1.B4.1” (copied from what B4 broadcast). 6. B3 records its sync server information as “2.B3.3” (wave 2, B3, slot 3). 7. B3 sends an “unlock request” message to B4, then to any remaining neighbors, in reverse order of locking. Following such unlocking, other BSUs that have yet to synchronize may then synchronize themselves. Wave 1, BSU B7:
1. B7 notices that among his discovered neighbors, B4 has a higher “priority” than B3 since it has a lower wave number, so B7 decides to synchronize to B4, as B3 did. 2. B7 sends a “lock request” message to B4 (which has the lowest slot number). 3. B4 returns a “lock granted” message to B7 along with any neighbor's neighbors and their synchronization slots (not established yet in this example). 4. B7 sends a “lock request” message to B3 (which has the next lowest slot number). 5. B3 returns a “lock granted” message to B7 along with any neighbor's neighbors and their synchronization slots (not established yet in this example). 6. B7 performs a lock request/lock grant message exchange with the rest of its neighbors (none in this example). 7. B7 chooses a slot number, e.g., the next lowest available slot number: “5.” 8. B7 records its sync client information as “1.B4.1” (copied from what B4 broadcast). 9. B7 records its sync server information as “2.B7.5” (wave 2, B7, slot 5). 10. B7 sends an “unlock request” message to other neighbors (none in this example), then B3, then B4, in reverse order of locking. Wave 1, BSU B8:
1. B8 notices that among his discovered neighbors, B4 has a higher priority than B7 since it has a lower wave number, so B8 decides to synchronize on B4 as B3 and B7 did. 2. B8 sends a “lock request” message to B4 (which has the lowest slot number). 3. B4 returns a “lock granted” message to B8 along with any neighbor's neighbors and their synchronization slots (not established yet in this example). 4. B8 sends a “lock request” message to B7 (which has next lowest slot number). 5. B7 returns a “lock granted” message to B8 along with any neighbor's neighbors and their synchronization slots (not established yet). 6. B8 performs a lock request/lock grant message exchange with the rest of its neighbors. 7. B8 chooses, e.g., the lowest available slot number: ‘7’. 8. B8 records its sync client information as “1.B4.1” (copied from what B4 broadcast). 9. B8 records its sync server information as “2.B8.7” (wave 2, B8, slot 7). 10. B8 sends an “unlock request” message to other neighbors (none in this example), then B7, then B4, in reverse order of locking. At this point, “Wave 1” is considered finished—neighbors at the smallest “radius,” or distance from the seed, have been synchronized.
Incorporated by reference herein are all above references, patents, or applications and the following U.S. applications, which are assigned to the assignee of this application: application Ser. No. 10/052,910, entitled “Link Context Mobility, Such as for use in Wireless Networks”, filed Jan. 18, 2002; Application No. 60/288,296, filed May 2, 2001, now PCT Application No. US02/13880, filed May 2, 2002, entitled “Wireless Base Neighbor Discovery in a Communication System, Such as a System Employing a Short-Range Frequency Hopping Scheme”; Application No. 60/288,270, filed May 2, 2001, now PCT Application No. US02/1 3710, filed May 2, 2002, entitled “Connection Initiation in Wireless Networks Including Load Balancing”; Application No. 60/288,301, filed May 2, 2001, now PCT Application No. US02/13879, filed May 2, 2002, entitled “Reducing Mutual Channel Interference in Frequency-Hopping Spread Spectrum Wireless Communication Systems, Such as Bluetooth Systems”; Application No. 60/288,300, filed May 2, 2001, now PCT Application No. US02/13889, filed May 2, 2002, entitled “Method and System for Indicating Link Quality Among Neighboring Wireless Base Stations”; and Application No. 60/311716, entitled “Virtual Bluetooth Devices as a Means of Extending Pairing and Bonding in a Bluetooth Network”. Aspects of the invention can be modified, if necessary, to employ the systems, functions and concepts of the various patents and applications described above to provide yet further embodiments of the invention.
that is to say, in a sense of “including, but not limited to.” Words using the singular or plural number also include the plural or singular number respectively. Additionally, the words “herein,” “above”, “below,” and words of similar import, when used in this application, shall refer to this application as a whole and not to any particular portions of this application.
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H04W56/00Cooperative ClassificationH04W84/18, H04L29/12009, H04L29/12207, H04L7/0008, H04W56/00, H04B7/2662, H04W36/0033, H04L61/20European ClassificationH04W36/00P2T, H04L61/20, H04L29/12A, H04L29/12A3, H04B7/26VLegal EventsDateCodeEventDescriptionJul 30, 2002ASAssignmentOwner name: STRIX SYSTEMS, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BEASLEY, JAMES;DOMBROWSKI, DENNIS;KUIKEN, MATTHEW;AND OTHERS;REEL/FRAME:013133/0104;SIGNING DATES FROM 20020528 TO 20020529Aug 18, 2010FPAYFee paymentYear of fee payment: 4Sep 24, 2014SULPSurcharge for late paymentYear of fee payment: 7Sep 24, 2014FPAYFee paymentYear of fee payment: 8RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services