US20060098604A1 - Method and apparatus for contention management in a radio-based packet network - Google Patents

Method and apparatus for contention management in a radio-based packet network Download PDF

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US20060098604A1
US20060098604A1 US11/297,947 US29794705A US2006098604A1 US 20060098604 A1 US20060098604 A1 US 20060098604A1 US 29794705 A US29794705 A US 29794705A US 2006098604 A1 US2006098604 A1 US 2006098604A1
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node
controlling node
controlling
nodes
contending
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George Flammer
David Paulsen
Michael Ritter
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Proxim Wireless Corp
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Ricochet Networks Inc
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Priority to US09/894,843 priority Critical patent/US6999441B2/en
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Assigned to METRICOM, INC. reassignment METRICOM, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RITTER, MICHAEL W., FLAMMER, III, GEORGE H., PAULSEN, DAVID L.
Assigned to RICOCHET NETWORKS, INC. reassignment RICOCHET NETWORKS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: METRICOM, INC.
Publication of US20060098604A1 publication Critical patent/US20060098604A1/en
Assigned to TERABEAM, INC. reassignment TERABEAM, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RICOCHET NETWORKS, INC.
Assigned to PROXIM WIRELESS CORPORATION reassignment PROXIM WIRELESS CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: TERABEAM, INC.
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/04Scheduled or contention-free access
    • H04W74/06Scheduled or contention-free access using polling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/08Load balancing or load distribution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel

Abstract

In a mesh communication network, a poll request protocol (PRP) is provided in which a special packet is broadcast by the congested node when it is ready to provide services. The controlling node (usually the more congested node) broadcasts a packet to request poll signals from nodes desiring resources of the controlling node. The contending nodes then have equal chances to request the services of the controlling node by sending poll signals. The controlling node can then arbitrate the requests, determine the most fair and efficient use of its resources, and broadcast a scheduling packet to inform the contending nodes when to inform the contending nodes of controlling node scheduling. The contending nodes then send their packets to the controlling node without lost packets caused by congestion collisions. The controlling node can then send data to the contending nodes also without lost packets.

Description

    CROSS-REFERENCES TO RELATED APPLICATIONS
  • This application is a continuation of U.S. patent application Ser. No. 09/894,843, filed Jun. 27, 2001, and entitled “METHOD AND APPARATUS FOR CONTENTION MANAGEMENT IN A RADIO-BASED PACKET NETWORK,” the complete disclosure of which is herein incorporated by reference.
  • STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
  • NOT APPLICABLE
  • REFERENCE TO A “SEQUENCE LISTING,” A TABLE, OR A COMPUTER PROGRAM LISTING APPENDIX SUBMITTED ON A COMPACT DISK NOT APPLICABLE BACKGROUND OF THE INVENTION
  • This invention relates methods and apparatus for regulating traffic among contending nodes, being particularly advantageous in a wireless mesh packet radio network system.
  • In a meshed communication system, packets will favor routes which historically have provided the best performance. As traffic increases, previously acceptable paths will provide degraded performance because of congestion unless alternate, normally slower paths are used or unless communication protocols provide dynamic relief at the affected nodes by changing their characteristics to be more efficient under load.
  • Meshed packet networks are one of several types of data communication network architectures that support packet communication. Other major types are star (e.g., cellular or 10-baseT) and bus (e.g., computer backplane). Mesh networks have several advantages over other architectures for providing high-capacity, high reliability data communication over a large area and to a large number of users.
  • In a radio-based packet mesh network, an interconnected mesh of data packet sending and receiving nodes collectively captures, routes and delivers data packets in a shared medium. The sharing of this medium results in mutual interference and loss of some packets due to collisions caused by congestion. When a packet is lost, it must be retransmitted, which causes further congestion in the network and causes further packet loss. The packet loss and retransmission consume the limited bandwidth that is used to provide the communication services the network was installed for. It is desirable to minimize this loss of packets so that the network can provide a greater level of performance to the greatest number of users of the network.
  • Any transmissions or packets that are sent that do not deliver data to the users of the network decrease the efficiency of the network. The higher the efficiency of the network, the more useful work it is performing and the higher its intrinsic value. It is desirable therefore to minimize the overhead packets and transmissions that the protocol uses to communicate to other nodes and to maximize the number of packets that actually deliver data to the users of the network.
  • As a network becomes more congested and it attempts to deliver more packets than it is capable of, it is desirous that a user get their fair share of the resources. In typical packet networks some users will be favored over others because of the topology of the network or the time distribution of the traffic that they are sending. The network protocols should be designed so that the bandwidth is allocated in a fair and equitable manner regardless of these circumstances.
  • In a network with intelligent nodes, each node works to manage the traffic through itself. There are several known methods by which this might be done, each has disadvantages, as described below, over the invention described in this patent:
  • Polling: The controlling or contended node may poll each of the nodes contending for services. The controlling node has imperfect information regarding the servicing needs of the contending (or slave) nodes. Bandwidth used by the controlling node determining if demand exists is overhead which should be minimized. Particularly in a meshed radio network, the extra transmissions can cause further degradation of services because they can increase congestion for multiple nodes.
  • CSMA/CD: With the Carrier Sense Multiple Access/Collision Detect protocol each node contending for the services transmits (polls) and awaits a response. If the expected acknowledgment is not forthcoming, each of the contending nodes “backs off” or delays an algorithmic amount of time and then retries the poll transmission. This technique is commonly used in wired LAN topologies where all nodes are in reliable communication with each other and thus can reliably hear the acknowledgment to the poll and know when not to transmit. Unfortunately, in many topologies, because of unreliable communication channels, each node has only imperfect information about the state of the targeted node. In this case, only the successful contender (if there was one) is guaranteed to know exactly when the contended node will be free to receive another packet (after the successful node has finished transmitting its packet).
  • CDMA: With Code Division Multiple Access, contending nodes transmit by means of a limited set of orthogonal codes. These codes can be selectively detected by decoding each transmission with its own coding sequence. This technique can be used for sending packets from multiple simultaneously transmitting mobile units on the same frequency channel where relative timing can be maintained. However, the frequency channel bandwidth must be increased to handle the additional transmissions. The limitations of this technique are manifold: the processing gain of the coding used limits the number of simultaneously transmitting mobile units. For greatest capacity, the power level of the mobile units must be controlled to be nearly uniform when received at each multiple-station receiving node such as a mobile telephone cellsite. This requires additional protocol overhead which reduces the efficiency of the network.
  • It is well known that CSMA/CD does not work efficiently as a congestion-limiting scheme for meshed radio networks because of the nature of radio where all nodes cannot ‘see’, or simultaneously communicate with, each other and thus are not able to reliably avoid burst transmissions which block each other. This is a particularly severe problem when the applied load of traffic is large relative to congested node capacity.
  • Other, more sophisticated protocols (such as GAMA-PS as described by Andrew Muir and J. J. Garcia-Luna-Aceves, “An Efficient Packet Sensing MAC Protocol for Wireless Networks”, MONET 3(2):221-234 (1998)) work better as a congestion-limiting scheme for radio based systems communicating with each other on a single frequency channel (analogous to a wire). They are; however, unable to handle multiple channels and thus take advantage of the inherent efficiencies available in a meshed network where multiple packets can be sent between different pairs of nodes simultaneously. Protocols designed to handle multiple channels, such as those used for optical networks, have not been designed to efficiently handle unreliable channels, such as those typical in radio networks. Other protocols (such as PRMA as described by D. J. Goodman, R. A. Valenzuela, K. T. Gayliard and B. Ramamurthy, “Packet Reservation Multiple Access for Local Wireless Communications,” IEEE Transactions on Communications, (August 1989) require even more complicated collision detection that is not cost effective or is not available with current radio technology.
  • The following patents and publications provide further background information:
  • U.S. Pat. No. 5,384,777 Ahmadi, et. al. Jan. 24, 1995, entitled “Adaptive Medium Access Control Scheme for Wireless LAN”; Ahmadi, Hamid; Bantz, David F.; Bauchot, Frederic J.; Krishna, Arvind; La Maire, Richard O.; Natarajan, Kadathur S.; assigned to IBM Corporation filed Apr. 19, 1993. It discloses an evidently inflexible fixed slot master (base)/slave contention reduction scheme. Access is random access, but there is no teaching of mini-slot categories.
  • ANSI/IEEE Standard 802.11, 1999 Edition. “IEEE Standards for information technology; Telecommunications and information exchange between systems; Local and metropolitan area networks; specific requirements; Part II: Wireless LAN Medium Access Control (MAC) and Physical Specifications. It teaches a time-based scheme dependent on a single base-station with which all nodes must be in contact.
  • U.S. Pat. No. 5,471,469: Nov. 28, 1995, entitled. “Method of resolving media contention in radio communication links”; George Flammer and Brett Galloway, assigned to Metricom of Los Gatos, Calif. This disclosure teaches a novel way of reducing contention in a frequency hopped packet radio network but under load (heavy contention) is an inefficient and unfair protocol.
  • U.S. Pat. No. 5,297,144: “Reservation-based polling protocol for a wireless data communications network”; Gilbert; Sheldon L., Heide; Carolyn L., Director; Dennis L., assigned to Spectrix Corporation of Evanston, Ill. This teaches an inefficient polling mechanism that does not take advantage of the broadcast nature of wireless and requires multiple handshakes between each data transfer.
  • U.S. Pat. No. 5,818,828: Oct. 6, 1998 entitled “Hybrid multiple access protocol for wireless frequency hopping microcells with adaptive backhaul and heartbeat”; Packer; Robert L., Xu; Milton Y., Bettendorff; John, assigned to Metricom, Inc., Los Gatos, Calif. This disclosure teaches a polling system that requires a Master/Slave relationship to be set up and is inefficient in requiring a poll for every data packet sent and a poll to determine if there is any data available to send.
  • What is needed is an improvement in communication protocols for mesh networks with multiple channels that can perform efficiently with imperfect channels and provide increased throughput and fair allocation of resources, even under load, with minimal increase in control overhead.
  • BRIEF SUMMARY OF THE INVENTION
  • According to the invention, in a mesh communication network such as a radio-based packet network, a poll request protocol (PRP) is implemented in which a special packet or datum of information is broadcast by the congested node when it is ready to provide services. Specifically, the controlling node (usually the more congested node) broadcasts a packet requesting poll signals from nodes desiring resources of the controlling node. The contending nodes then have equal chances to request the services of the controlling node by sending poll signals. The controlling node can then arbitrate the requests, determine the most fair and efficient use of its resources, and broadcast a scheduling packet to inform the contending nodes of when to send their packets and inform the contending nodes that the controlling node will send data to them. The contending nodes then send their packets as scheduled to the controlling node without lost packets caused by congestion collisions, the controlling node can then send data to the contending nodes also without lost packets caused by random access collisions with the receiving nodes.
  • The present invention is an advance on the typical method and apparatus utilized in a mesh network among communicating nodes that experience congestion due to unavoidably high traffic levels. The invention also provides advantages in efficiency and fairness, particularly in a meshed packet radio network system where broadcast must be used and bandwidth is a very limited resource.
  • This technique is particularly advantageous when coordinating the resource demands of an indeterminate number of nodes, each generating such demand asynchronously. In this case (which is typical of packet radio networks) the broadcast packet from the contended node provides identical information to all of the potential client nodes; such as timing, load, and availability, thereby giving each contending node an equal view of the controlling node's state. This allows each contending node an equal chance of using the controlling node's resources, thus preventing resource capture by lucky or favored nodes.
  • Widespread implementation of PRP increases the network carrying capacity by substantially reducing poll packets over the prior art and limiting them to the active clients of the contended node, the PRP master.
  • Unlike prior art polling methods, which operate within the master/slave paradigm, where the master polls the slave units, asking them if they have data for transfer and/or whether they are present to receive a data transfer to them; PRP limits the number of polls sent and received. In the prior art, the slave units either respond to polling whether or not they have data or decline to respond if they have none. It is worthwhile to note that the master interrogates the slaves through the polling. Polls unheard or which fall upon slaves with no data to send are examples of expensive spectrum wasted. Since the master (being the contended resource) is typically in a propagationally favored location or configuration, wasted packet from the master radio node are maximally deleterious to the network as a whole.
  • Since the PRP packet is broadcast, and thus available to a large number of interested and affected nodes, the number of Polls and the number of wasted packets in the media is minimized, leaving greater network capacity for message traffic. Since the radios responding to the single broadcast PRP packet, i.e., doing the polling, are often subscriber devices with a smaller radius of interference, their polls are less deleterious to the network, thus leaving greater network capacity for communicating.
  • Since all requested polls are received in the same phase, prioritization of the traffic around and through the contended node is optimizable so multiple levels of service are possible. This is an advance over prior art in polling which did not allow for scheduling or priority.
  • Since a PRP master can easily listen for another PRP master, and the PRP system operates asynchronously, all nodes in the network, even portable nodes, can use PRP to control their own congestion. In particular, network software code is more manageable since all nodes can run the same algorithm and all nodes react similarly.
  • The invention will be better understood upon reference to the following detailed description in connection with the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a block diagram of a mesh radio system for illustrating contention resolution according to the invention.
  • FIG. 2 is a time-flow chart according to the invention.
  • FIG. 3A, 3B, 3C are graphical descriptions of the types of packets used in the invention.
  • FIG. 4 is a state diagram of the invention.
  • FIGS. 5A-5E is a detailed flow chart of one aspect of the invention relating to the PRP master.
  • FIGS. 6A-6C is a detailed flow chart of another aspect of the invention relating to the PRP client.
  • DETAILED DESCRIPTION OF THE INVENTION
  • As shown in FIG. 1, it is often the case in a mesh network 10 that multiple radios of a selected type, namely wireless modems 12 or poletops 14, wish to send their packet to the same node A. The modems 12 send packets to and receive packets from various poletops 14. The poletops 14 send and receive packets to and from a poletop 14 at Node A that is connected to the wired infrastructure backbone 16. Each group 16, 18, 20, 22 of radios participating in a PRP group is logically associated by communication with a common server at Node A, Node B, Node C and Node D (as circled). One of the PRP groups 22 can be defined as consisting of only poletop units associated with a server at node A. The node with contention above an indeterminate threshold representing congestion is the controlling node for its PRP group; all of the other radios must request its service in order to be functional. In the other three groups, the poletop (at nodes B, C, or D) the nodes are also under contention and the radios in the respective associated PRP groups request service. Thus a node may be a controlling node in one PRP group, while at the same time it could be a requesting node in another PRP group.
  • FIG. 4 is a state diagram of a method according to the invention. There are three basic states or modes involved in the implementation. First a nonPRP mode 1, in which any node detects that it may benefit from the increased overhead of congestion management protocol (transition Step A). It may determine this from a variety of sources, such as client nodes that can report their “success rate” or “desperation index” to the contended node (when they finally get to give the node some data). Alternatively, a congested node can determine for itself that the level of traffic it is carrying must be generating delays and enter the StartPRP mode (state) itself.
  • Once it is determined that the PRP mode is appropriate, the congested node goes into the StartPRP state 2 and advertises its changed state via any mechanisms it has available to do so (transition Step B). These means include:
  • Broadcast packets that indicate state, timing, and traffic level.
  • Bits set in the header of packets exchanged in the course of ‘normal’ communication.
  • “Assumptions” made by other nodes in response to local failures generated and tabulated in the course of data traffic handling.
  • Thereupon, the node is in the PRP state 3 and the PRP mechanism is used to resolve contention and manage client radios in the vicinity (transition Step C).
  • When a node determines that it is no longer under contention, e.g., it receives no polls after a poll request or it determines that the requested services can be handled more efficiently without PRP, it exits the PRP state and returns to the NonPRP state 1 (via transition Step D).
  • FIG. 2 is a time-flow diagram of a method of the invention showing in greater detail the exchange of packets between the various nodes when the contended node is in PRP state 3. When in the PRP state 3, a node broadcasts a Poll Request Packet (PRP) to solicit polls from the clients that actively have traffic to offer (Step C1). Since client nodes can vary widely in number and in traffic profiles, the Poll Request Protocol ‘master’ can dynamically assign bandwidth to clients for poll requests and data packets under control of its particular selection algorithms. The number of mini-slots for Polls can be increased and distributed among different classes of traffic.
  • The contending nodes that have not been scheduled to send data in the PRP packet send Polls to the master node requesting to send a data packet. The Polls are targeted to fall into one of several mini-slots in time after the end of the PRP packet according to the algorithms dynamically specified in the PRP packet. Several mini-slots may be assigned to a particular class of clients by the PRP master to reduce contention for that class of clients. The clients randomly target the polls into one of the designated mini-slots. (Step C2).
  • The PRP packet and, after receipt of the polls, the Contention Resolution Packet (CRP), lay out the rules of transmission among nodes desiring to transmit to the PRP master (Step C3). These are heard by all and provide useful client-client transmission information. [Note that a PRP master may be (and usually will be) a client to another PRP master.]
  • This mechanism has many advantages. By this means the client/master communications are synchronized, communication in the affected community of radios is freed of collisions, and priorities can be directly enforced so that high priority exchanges are completed before lower priority traffic is started.
  • Specifically, transmit/receive phases are enabled (Step C4). In this mode, all traffic to be sent to the master can be consecutively sent before the master radio node transmits data back. This mode permits reduction or elimination of “turn around time” as the clients and master radios switch back and forth between transmit and receive.
  • During this mode, availability and traffic load are announced, as well as acknowledgments for correctly received data packets (Step C5). Thereby, the “losers” of the polling competition for the attention of the master radio have useful knowledge by which they can decide whether to select another node for forwarding their traffic.
  • The clients that received data packets as schedule in the CR Packet, transmit their scheduled acknowledgments of the received data packets back to the controlling node (Step C6). Thus a complete PRP cycle is completed and data is transferred between a controlling node under contention to a plurality of requesting nodes in a fair and efficient manner.
  • The node then determines if it is still in poll-request mode. If not, it proceeds to transition Step D, if it is still under contention. For instance, multiple clients have just requested to transmit data to it in this PRP cycle, then the node stays in PRP mode. Before starting a new PRP cycle, the node can attempt to send data that it has that was not destined to any of the requesting clients. (This data would have been sent in Step C4). For instance, some of the data that a requesting client has just sent may be forwarded further along in the network.
  • The whole PRP cycle then repeats, starting at step C1.
  • The Poll Request Protocol (PRP) has been designed with a number of optional fields:
  • The PRP packet itself can be sent upon return from completion of off-channel traffic carrying (sent as an “I'm back” packet).
  • The PRP master allocates its resources by specifying the number and permitted occupants of the (smaller) poll minislots. These minislots are short periods in time where specific nodes or classes of nodes are permitted to poll the PRP master. By specifying the number of these slots and their possible occupants, the PRP master can arbitrarily refine the performance of the radios by using it as a forwarding or terminus link.
  • The client radios receive the results of their polls in a subsequent contention resolution packet. This form of contention resolution packet has timing and frequency information in it that the contending clients must follow if they are to utilize the PRP master.
  • FIG. 5A-5E is a flow chart of the invention showing more detail of the states. The node enters the PRP mode (State 3 of FIG. 4, Step 5A-1 of FIG. 5A) and detects for packets on the nonPRP send queue (5A-2); if yes, it sends the nonPRP data (5A-3) and proceeds; otherwise it simply proceeds to determine the number of minislots required for pollers (“clients”) (5A-4). The minislots are timeslots allocated during which clients are permitted to contact the node. The node then determines if any of the pollers are already assigned minislots (5A-5). Next the node determines its average load for the past time period (5A-6) to allow the use of an algorithm to advertise the allocation of minislots. It then constructs a Broadcast Request Packet (FIG. 3A) (5A-7) and thereupon sends the Broadcast Request Packet (5A-8).
  • Referring to FIG. 5B, the node thereafter listens during a contention minislot for a Poll Packet (FIG. 3B) (Step 5B-1) and if it does hear a Poll Packet (5B-2) it records the Poll Packet (5B-3), increments a first counter of the number of minislots listened to 5B-4). If it does not hear a Poll Packet, it merely increments the counter value (5B-4). If it senses that the counter value is equal to the number of contention minislots, it continues on (5B-5); otherwise it continues to listen (5B-1).
  • Referring to FIG. 5C, it then continues by listening during one or more reserved minislots for a Poll Packet (FIG. 3B) (Step 5C-1) and if it hears a Poll Packet (5C-2) responds as before by recording the Poll Packet (5C-3), incrementing a second counter (5C-4) and tests to see if the second counter value equals the number of reserved minislots (5C-5), repeating the process until it does equal. When it does equal, it constructs a Contention Resolution Packet (FIG. 3C) (Step 5C-6), which is used to carry the sending transmit start time to clients and pollers. It then broadcasts this Contention Resolution Packet (5C-7).
  • Referring to FIG. 5D, the node next sets up and triggers a timer to set the maximum listening time for the end of an expected variable length data packet (FIG. 2 at C4) (Step 5D-1). This could be a timer for each data packet or it could be a timer for all expected packets in a sequence. The node then listens for the Data Packets (5D-2) and if it doesn't hear one (5D-3) it checks for time expiration (5D-6) and either repeats or times out. If it hears a Data Packet, it records the Data Packet (5D-4) and checks to see if this is the last Data Packet to listen for (5D-5). Once it has completed listening, it sends the Designated Data Packets directed to the clients (5D-7), then checks all received packets for correctness, deleting those that are incorrect (5D-8) before continuing.
  • Referring to FIG. 5E, the node thereafter constructs a single Broadcast Acknowledgment Packet (FIG. 2) which carries an acknowledgment for every correctly received packet, plus designating a set of reserved minislots for each client wishing to reply with more data (Step 5E-1), and it broadcasts this packet (5E-2), thereafter listing for receive acknowledgments (FIG. 2) (Step 5E-3). For each acknowledged packet, it deletes the corresponding packet from its send queue (5E-4) so it will not be resent, places each received packet that is destined for a poller in the PRPsend queue (5E-5), and then it places all other packets in the nonPRPsend queue (5E-6). If there is nothing placed in these queues as checked (5E-7), it exits the PRP mode (state 3 FIG. 4, Step 5E-8); otherwise it repeats the process from the beginning of the sequence. (FIG. 5E to FIG. 5A, Step 5E-9).
  • Referring to FIGS. 6A-6C, the flow chart for a PRP client is described. Its state diagram is not shown, but the states are evident as being correspondence to the state diagram of FIG. 4. In FIG. 6A, the client node enters a PRP state corresponding to the same state as the server node (Step 6A-1), sets up a timer for PRP timeout on the server node (6A-2) and monitors for timer expiration (6A-3). If the timer expires, the client leaves the PRP state corresponding to the state in the server node (6A-4).
  • Until the timer expires, the client listens for the Broadcast Poll Request Packet (6A-5) and if it doesn't hear it, continues with other work (6A-10). When it hears the Broadcast Poll Request Packet, it checks for a reserved contention minislot for itself (6A-7). Upon finding none it sends a Poll Packet in any random contention minislot (6A-8) and continues. Otherwise it sends a Poll Packet in the specified reserved minislot (6A-9) and continues.
  • Referring to FIG. 6B, the client then listens for the Broadcast Resolution Packet (6B-1) and finding none (6B-2) continues; otherwise it checks to see if its own data was requested (6B-3) and if so, sends packets at the specified time (6B-4). It then determines if the data packets are to be sent to it (6B-5); if not it continues; otherwise it listens for the data packets at the specified time (6B-6). It also tests for the reception of data packets designated for it (Step 6B-7) and proceeds with the processes.
  • Referring to 6C, if Data Packets are heard, it prepares a Receive Acknowledgment Packet (6C-1) and listens for a broadcast acknowledgment from the server (6C-2). Continuing it checks for whether it heard the Broadcast Acknowledgment of the sent packets (6C-3) and if heard, deletes the acknowledged packets from its own send queue (6C-4) and sends the receive acknowledgment packet (6C-5). Checking to see if any packets are left to be sent to the server (6C-6), if yes it reverts to the timer setup (6A-2) to repeat the process. If not, it checks for any further expected data to transfer (6C-7) and either reverts as above or if nothing further is expected, leaves the PRPstate with the server (6C-8).
  • The invention has now been explained with respect to specific embodiments. Other embodiments will be apparent to those of ordinary skill in the art. It is therefore not intended that the invention be limited, except as indicated by the appended claims.

Claims (8)

1. In a mesh network having a plurality of communication nodes, wherein one or more nodes may be either a contending node when sending data for transmission within the mesh network or a controlling node for receiving data for transmission within the mesh network, a method for accessing a controlling node, comprising:
accessing the controlling node in a non-PRP mode where multiple nodes are not contending for access to the controlling node; and
accessing the controlling node in a PRP mode where multiple nodes are contending for access to the controlling node, the PRP mode comprising:
withholding, at a contending node, requests for access to a controlling node until receipt, at the contending node, of a poll request packet broadcast from the controlling node, the poll request packet containing information indicating availability of a communication slot;
broadcasting from the controlling node to a plurality of contending nodes the poll request packet when the controlling node is ready to provide services;
directing from the contending node a poll packet to request access to the controlling node; and
broadcasting from the controlling node to all of the plurality of contending nodes a control packet containing rules information for each contending node requesting access to follow in order to send data to the controlling node.
2. The method according to claim 1, wherein the control packet has rules information from the controlling node that directs the requesting nodes when to send and receive data; and wherein the method further comprises:
causing each individual requesting node to transmit local data in turn to the controlling node.
3. The method of claim 2, further including:
scheduling each individual requesting node which receives rules information from the controlling node; thereafter
receiving at each individual requesting node acknowledgments from the controlling node, the acknowledgments being for corresponding individually transmitted data packets from the requesting node; and thereafter
transmitting from each individual requesting node further acknowledgments to receipt of data if data has been previously transmitted to it by the controlling node.
4. The method according to claim 3, further comprising:
purging data packets from a transmitting node upon receipt of acknowledgment of successful reception of said data packets.
5. In a mesh network having a plurality of communications nodes, wherein one or more modes may be either a contending node or a controlling node, an apparatus for requesting access to a congested controlling node, comprising:
means for accessing the controlling node in a non-PRP mode where multiple nodes are not contending for access to the controlling node; and
means for accessing the controlling node in a PRP mode where multiple nodes are contending for access to the controlling node, the means for accessing in a PRP mode comprising:
means for withholding, at a requesting node, requests for access to said congested node while awaiting receipt, at said requesting node, of a poll request packet containing a first datum of information indicating availability of a communication slot;
broadcasting means for broadcasting from said congested node said poll request packet when said congested node is ready to provide services; and thereafter
means at said requesting node for directing from said requesting node a poll packet to request access to the congested node; and
means operative to broadcast a control packet from the congested node to all the requesting nodes having rules information that directs the requesting nodes when to send and receive data packets.
6. The apparatus according to claim 5, further comprising:
means to cause thereafter each individual requesting node to transmit its data packets in turn to the controlling node.
7. The apparatus according to claim 6, further including:
means at said controlling node for scheduling transmitting times for each individual requesting node which receives rules information from the controlling node;
means for receiving at each individual requesting node acknowledgments of corresponding individually transmitted data packets from the requesting node; and
means for transmitting from each individual requesting node further acknowledgments to receipt of data if data has been previously transmitted to it by the controlling node.
8. The apparatus according to claim 7, further comprising:
means for purging data packets from a transmitting node upon receipt of acknowledgment of successful reception of said data packets.
US11/297,947 2001-06-27 2005-12-09 Method and apparatus for contention management in a radio-based packet network Abandoned US20060098604A1 (en)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060059273A1 (en) * 2004-09-16 2006-03-16 Carnevale Michael J Envelope packet architecture for broadband engine
US7324491B1 (en) * 2003-10-29 2008-01-29 Avaya Technology Llc Method and apparatus for over-the-air bandwidth reservations in wireless networks
US20110053603A1 (en) * 2009-06-10 2011-03-03 Qualcomm Incorporated Systems, apparatus and methods for communicating downlink information
US20110064037A1 (en) * 2009-09-14 2011-03-17 Qualcomm Incorporated Cross-subframe control channel design
US7949747B1 (en) * 2006-08-18 2011-05-24 Ecowater Systems Llc Method and system of communication in a wireless water treatment system
US20110190024A1 (en) * 2009-08-11 2011-08-04 Qualcomm Incorporated Interference mitigation by puncturing transmission of interfering cells
US20110205982A1 (en) * 2009-08-24 2011-08-25 Qualcomm Incorporated Method and apparatus that facilitates detecting system information blocks in a heterogeneous network
US20110243075A1 (en) * 2009-06-16 2011-10-06 Qualcomm Incorporated Method and apparatus for access procedure in a wireless communication system
US8138934B2 (en) 2007-11-25 2012-03-20 Trilliant Networks, Inc. System and method for false alert filtering of event messages within a network
US8144596B2 (en) 2007-11-25 2012-03-27 Trilliant Networks, Inc. Communication and message route optimization and messaging in a mesh network
US8171364B2 (en) 2007-11-25 2012-05-01 Trilliant Networks, Inc. System and method for power outage and restoration notification in an advanced metering infrastructure network
US8289182B2 (en) 2008-11-21 2012-10-16 Trilliant Networks, Inc. Methods and systems for virtual energy management display
US8319658B2 (en) 2009-03-11 2012-11-27 Trilliant Networks, Inc. Process, device and system for mapping transformers to meters and locating non-technical line losses
US8332055B2 (en) 2007-11-25 2012-12-11 Trilliant Networks, Inc. Energy use control system and method
US8334787B2 (en) 2007-10-25 2012-12-18 Trilliant Networks, Inc. Gas meter having ultra-sensitive magnetic material retrofitted onto meter dial and method for performing meter retrofit
US8699377B2 (en) 2008-09-04 2014-04-15 Trilliant Networks, Inc. System and method for implementing mesh network communications using a mesh network protocol
US8832428B2 (en) 2010-11-15 2014-09-09 Trilliant Holdings Inc. System and method for securely communicating across multiple networks using a single radio
US8856323B2 (en) 2011-02-10 2014-10-07 Trilliant Holdings, Inc. Device and method for facilitating secure communications over a cellular network
US8886190B2 (en) 2010-10-08 2014-11-11 Qualcomm Incorporated Method and apparatus for measuring cells in the presence of interference
US8942192B2 (en) 2009-09-15 2015-01-27 Qualcomm Incorporated Methods and apparatus for subframe interlacing in heterogeneous networks
US8970394B2 (en) 2011-01-25 2015-03-03 Trilliant Holdings Inc. Aggregated real-time power outages/restoration reporting (RTPOR) in a secure mesh network
US9001787B1 (en) 2011-09-20 2015-04-07 Trilliant Networks Inc. System and method for implementing handover of a hybrid communications module
US9013173B2 (en) 2010-09-13 2015-04-21 Trilliant Networks, Inc. Process for detecting energy theft
US9041349B2 (en) 2011-03-08 2015-05-26 Trilliant Networks, Inc. System and method for managing load distribution across a power grid
US9084120B2 (en) 2010-08-27 2015-07-14 Trilliant Networks Inc. System and method for interference free operation of co-located transceivers
US9125072B2 (en) 2010-04-13 2015-09-01 Qualcomm Incorporated Heterogeneous network (HetNet) user equipment (UE) radio resource management (RRM) measurements
US9226288B2 (en) 2010-04-13 2015-12-29 Qualcomm Incorporated Method and apparatus for supporting communications in a heterogeneous network
US9271167B2 (en) 2010-04-13 2016-02-23 Qualcomm Incorporated Determination of radio link failure with enhanced interference coordination and cancellation
US9282383B2 (en) 2011-01-14 2016-03-08 Trilliant Incorporated Process, device and system for volt/VAR optimization
US9392608B2 (en) 2010-04-13 2016-07-12 Qualcomm Incorporated Resource partitioning information for enhanced interference coordination

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8019836B2 (en) * 2002-01-02 2011-09-13 Mesh Comm, Llc Wireless communication enabled meter and network
US20030058921A1 (en) * 2001-09-26 2003-03-27 Leeper David G. Apparatus and method for handoff in a wireless network
US7167913B2 (en) * 2002-06-05 2007-01-23 Universal Electronics Inc. System and method for managing communication links
US7420952B2 (en) 2002-10-28 2008-09-02 Mesh Dynamics, Inc. High performance wireless networks using distributed control
US7263379B1 (en) 2002-12-23 2007-08-28 Sti Licensing Corp. Communications network for emergency services personnel
US7398097B2 (en) * 2002-12-23 2008-07-08 Scott Technologies, Inc. Dual-mesh network and communication system for emergency services personnel
US20040174900A1 (en) * 2003-03-06 2004-09-09 Incucomm, Inc. A Delaware Corporation Method and system for providing broadband multimedia services
US20060171402A1 (en) * 2003-03-06 2006-08-03 Moore John A Method and system for providing broadband multimedia services
US7349701B2 (en) * 2004-06-15 2008-03-25 Rotani, Inc. Method and apparatus for creating shape antenna radiation patterns
US7302278B2 (en) * 2003-07-03 2007-11-27 Rotani, Inc. Method and apparatus for high throughput multiple radio sectorized wireless cell
US7400860B2 (en) 2004-06-15 2008-07-15 Rotani, Inc. Method and apparatus for increasing data throughput
JP4576102B2 (en) * 2003-08-06 2010-11-04 ミツミ電機株式会社 Communication system and a communication apparatus and communication method
US7336642B2 (en) * 2003-08-07 2008-02-26 Skypilot Networks, Inc. Communication protocol for a wireless mesh architecture
US20050135317A1 (en) * 2003-12-22 2005-06-23 Christopher Ware Method and system for multicast scheduling in a WLAN
WO2006029126A2 (en) * 2004-09-07 2006-03-16 Meshnetworks, Inc. System and method for associating different types of nodes with access point nodes in wireless network to route data in the wireless network
KR100690871B1 (en) * 2004-10-22 2007-03-09 엘지전자 주식회사 Method for determining server having controlling function
US7489282B2 (en) * 2005-01-21 2009-02-10 Rotani, Inc. Method and apparatus for an antenna module
US7586888B2 (en) * 2005-02-17 2009-09-08 Mobitrum Corporation Method and system for mesh network embedded devices
US7864715B2 (en) * 2005-03-28 2011-01-04 Kyocera Corporation Data communication method, communication server system, and communication terminal
US7630736B2 (en) * 2005-10-11 2009-12-08 Mobitrum Corporation Method and system for spatial data input, manipulation and distribution via an adaptive wireless transceiver
KR101011891B1 (en) * 2005-11-14 2011-02-01 엘지전자 주식회사 Method and apparatus for determining pt server having controlling function
CN101395820A (en) 2006-02-28 2009-03-25 罗塔尼公司 Methods and apparatus for overlapping MIMO antenna physical sectors
US20070209059A1 (en) * 2006-03-03 2007-09-06 Moore John A Communication system employing a control layer architecture
US7652571B2 (en) * 2006-07-10 2010-01-26 Scott Technologies, Inc. Graphical user interface for emergency apparatus and method for operating same
US8411590B2 (en) 2006-07-27 2013-04-02 Mobitrum Corporation Mesh network remote control device
US8305935B2 (en) * 2006-07-27 2012-11-06 Mobitrum Corporation Method and system for dynamic information exchange on location aware mesh network devices
US8305936B2 (en) 2006-07-27 2012-11-06 Mobitrum Corporation Method and system for dynamic information exchange on a mesh network in a vehicle
US8427979B1 (en) 2006-07-27 2013-04-23 Mobitrum Corporation Method and system for dynamic information exchange on location aware mesh network devices
US7801058B2 (en) * 2006-07-27 2010-09-21 Mobitrum Corporation Method and system for dynamic information exchange on mesh network devices
WO2009067252A1 (en) * 2007-11-25 2009-05-28 Trilliant Networks, Inc. Proxy use within a mesh network
CA2716727A1 (en) * 2007-11-25 2009-05-28 Trilliant Networks, Inc. Application layer authorization token and method
US20090189739A1 (en) * 2008-01-25 2009-07-30 Mobitrum Corporation Passive voice enabled rfid devices
KR100995905B1 (en) 2008-08-27 2010-11-23 성균관대학교산학협력단 Method for decreasing in wireless network bottleneck state
US8661143B2 (en) * 2009-01-16 2014-02-25 Electronics And Telecommunications Research Institute Reserving resources in centralized network by scanning superframes equal to or greater than maximum number of superframes allowed without listening to beacon period
US8730825B2 (en) * 2009-05-26 2014-05-20 Indian Institute Of Science Packet retransmission optimization in wireless network

Citations (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552554A (en) * 1984-06-25 1985-11-12 Medi-Tech Incorporated Introducing catheter
US4639252A (en) * 1985-04-05 1987-01-27 Research Medical, Inc. Venous return catheter
US4718081A (en) * 1986-11-13 1988-01-05 General Electric Company Method and apparatus for reducing handoff errors in a cellular radio telephone communications system
US4742512A (en) * 1985-07-19 1988-05-03 Nec Corporation Multipoint communication system having polling and reservation schemes
US4780885A (en) * 1982-12-01 1988-10-25 Paul Haim D Frequency management system
US4850036A (en) * 1987-08-21 1989-07-18 American Telephone And Telegraph Company Radio communication system using synchronous frequency hopping transmissions
US5061257A (en) * 1990-04-30 1991-10-29 Cordis Corporation Apertured, reinforced catheter
US5129096A (en) * 1989-05-12 1992-07-07 Tunstall Telecom Limited System which routes radio transmissions to selected repeaters for retransmission
US5257399A (en) * 1990-11-28 1993-10-26 Telefonaktiebolaget L M Ericsson Multiple access handling in a cellular communications system
US5280288A (en) * 1992-08-14 1994-01-18 Vorad Safety Systems, Inc. Interference avoidance system for vehicular radar system
US5297144A (en) * 1991-01-22 1994-03-22 Spectrix Corporation Reservation-based polling protocol for a wireless data communications network
US5355522A (en) * 1992-06-26 1994-10-11 Motorola, Inc. Frequency selection method and apparatus
US5374245A (en) * 1990-01-10 1994-12-20 Mahurkar; Sakharam D. Reinforced multiple-lumen catheter and apparatus and method for making the same
US5384777A (en) * 1993-04-19 1995-01-24 International Business Machines Corporation Adaptive medium access control scheme for wireless LAN
US5471469A (en) * 1994-02-08 1995-11-28 Metricon, Inc. Method of resolving media contention in radio communication links
US5513183A (en) * 1990-12-06 1996-04-30 Hughes Aircraft Company Method for exploitation of voice inactivity to increase the capacity of a time division multiple access radio communications system
US5541954A (en) * 1993-11-24 1996-07-30 Sanyo Electric Co., Ltd. Frequency hopping communication method and apparatus changing a hopping frequency as a result of a counted number of errors
US5546422A (en) * 1992-08-20 1996-08-13 Nexus 1994 Limited Method of transmitting low-power frequency hopped spread spectrum data
US5619493A (en) * 1992-11-03 1997-04-08 Rafael Armament Development Authority Spread-spectrum, frequency-hopping radio telephone system with voice activation
US5682605A (en) * 1994-11-14 1997-10-28 989008 Ontario Inc. Wireless communication system
US5737358A (en) * 1992-03-11 1998-04-07 Geotek Communications, Inc. Multiplexed radio communication system
US5737330A (en) * 1996-01-11 1998-04-07 Meteor Communications Corporation System and method for the efficient control of a radio communications network
US5767791A (en) * 1995-11-13 1998-06-16 Vitalcom Low-power circuit and method for providing rapid frequency lock in a wireless communications device
US5805633A (en) * 1995-09-06 1998-09-08 Telefonaktiebolaget L M Ericsson Method and apparatus for frequency planning in a multi-system cellular communication network
US5815667A (en) * 1995-11-28 1998-09-29 Ncr Corporation Circuits and methods for intelligent acknowledgement based flow control in a processing system network
US5818828A (en) * 1996-10-04 1998-10-06 Metricom, Inc. Hybrid multiple access protocol for wireless frequency hopping microcells with adaptive backhaul and heartbeat
US5844900A (en) * 1996-09-23 1998-12-01 Proxim, Inc. Method and apparatus for optimizing a medium access control protocol
US5859840A (en) * 1996-05-31 1999-01-12 Qualcomm Incorporated Spread spectrum communication system which defines channel groups comprising selected channels that are additional to a primary channel and transmits group messages during call set up
US5937002A (en) * 1994-07-15 1999-08-10 Telefonaktiebolaget Lm Ericsson Channel hopping in a radio communication system
US5963852A (en) * 1997-03-24 1999-10-05 Ericsson Inc. Dual band mobile station
US6023462A (en) * 1997-12-10 2000-02-08 L-3 Communications Corporation Fixed wireless loop system that ranks non-assigned PN codes to reduce interference
US6097707A (en) * 1995-05-19 2000-08-01 Hodzic; Migdat I. Adaptive digital wireless communications network apparatus and process
US6190358B1 (en) * 1995-02-24 2001-02-20 Medtronic Ave, Inc. Reinforced rapid exchange balloon catheter
US6252861B1 (en) * 1998-03-26 2001-06-26 Lucent Technologies, Inc. Methods and apparatus for interfrequency handoff in a wireless communication system
US6272313B1 (en) * 1997-02-03 2001-08-07 Hughes Electronics Corporation Method and apparatus for in-line detection of satellite signal lock
US6567416B1 (en) * 1997-10-14 2003-05-20 Lucent Technologies Inc. Method for access control in a multiple access system for communications networks
US6577613B1 (en) * 1999-03-02 2003-06-10 Verizon Corporate Services Group Inc. Method and apparatus for asynchronous reservation-oriented multiple access for wireless networks
US6785252B1 (en) * 1999-05-21 2004-08-31 Ensemble Communications, Inc. Method and apparatus for a self-correcting bandwidth request/grant protocol in a wireless communication system
US6788702B1 (en) * 1999-10-15 2004-09-07 Nokia Wireless Routers, Inc. Protocol for neighborhood-established transmission scheduling
US20050192558A1 (en) * 2004-02-27 2005-09-01 Chf Solutions, Inc. Peripheral access venous cannula with infusion side holes and embedded reinforcement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940974A (en) * 1988-11-01 1990-07-10 Norand Corporation Multiterminal communication system and method
US5130983A (en) * 1990-03-27 1992-07-14 Heffner Iii Horace W Method of polling to determine service needs and the like
US5896561A (en) * 1992-04-06 1999-04-20 Intermec Ip Corp. Communication network having a dormant polling protocol
WO1995011555A1 (en) * 1993-10-19 1995-04-27 International Business Machines Corporation Access control system for a multi-channel transmission ring
US5596577A (en) * 1995-05-02 1997-01-21 Motorola, Inc. Method and system for providing access by secondary stations to a shared transmission medium
JP2001168873A (en) * 1999-12-07 2001-06-22 Sony Corp Radio communication system, its method and radio communication equipment

Patent Citations (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4780885A (en) * 1982-12-01 1988-10-25 Paul Haim D Frequency management system
US4552554A (en) * 1984-06-25 1985-11-12 Medi-Tech Incorporated Introducing catheter
US4639252A (en) * 1985-04-05 1987-01-27 Research Medical, Inc. Venous return catheter
US4742512A (en) * 1985-07-19 1988-05-03 Nec Corporation Multipoint communication system having polling and reservation schemes
US4718081A (en) * 1986-11-13 1988-01-05 General Electric Company Method and apparatus for reducing handoff errors in a cellular radio telephone communications system
US4850036A (en) * 1987-08-21 1989-07-18 American Telephone And Telegraph Company Radio communication system using synchronous frequency hopping transmissions
US5129096A (en) * 1989-05-12 1992-07-07 Tunstall Telecom Limited System which routes radio transmissions to selected repeaters for retransmission
US5374245A (en) * 1990-01-10 1994-12-20 Mahurkar; Sakharam D. Reinforced multiple-lumen catheter and apparatus and method for making the same
US5061257A (en) * 1990-04-30 1991-10-29 Cordis Corporation Apertured, reinforced catheter
US5257399A (en) * 1990-11-28 1993-10-26 Telefonaktiebolaget L M Ericsson Multiple access handling in a cellular communications system
US5513183A (en) * 1990-12-06 1996-04-30 Hughes Aircraft Company Method for exploitation of voice inactivity to increase the capacity of a time division multiple access radio communications system
US5297144A (en) * 1991-01-22 1994-03-22 Spectrix Corporation Reservation-based polling protocol for a wireless data communications network
US5737358A (en) * 1992-03-11 1998-04-07 Geotek Communications, Inc. Multiplexed radio communication system
US5355522A (en) * 1992-06-26 1994-10-11 Motorola, Inc. Frequency selection method and apparatus
US5280288A (en) * 1992-08-14 1994-01-18 Vorad Safety Systems, Inc. Interference avoidance system for vehicular radar system
US5546422A (en) * 1992-08-20 1996-08-13 Nexus 1994 Limited Method of transmitting low-power frequency hopped spread spectrum data
US5619493A (en) * 1992-11-03 1997-04-08 Rafael Armament Development Authority Spread-spectrum, frequency-hopping radio telephone system with voice activation
US5384777A (en) * 1993-04-19 1995-01-24 International Business Machines Corporation Adaptive medium access control scheme for wireless LAN
US5541954A (en) * 1993-11-24 1996-07-30 Sanyo Electric Co., Ltd. Frequency hopping communication method and apparatus changing a hopping frequency as a result of a counted number of errors
US5471469A (en) * 1994-02-08 1995-11-28 Metricon, Inc. Method of resolving media contention in radio communication links
US6240125B1 (en) * 1994-07-15 2001-05-29 Telefonaktiebolaget Lm Ericsson (Publ) Method and means for frequency hopping in a radio communication system
US5937002A (en) * 1994-07-15 1999-08-10 Telefonaktiebolaget Lm Ericsson Channel hopping in a radio communication system
US5682605A (en) * 1994-11-14 1997-10-28 989008 Ontario Inc. Wireless communication system
US6190358B1 (en) * 1995-02-24 2001-02-20 Medtronic Ave, Inc. Reinforced rapid exchange balloon catheter
US6097707A (en) * 1995-05-19 2000-08-01 Hodzic; Migdat I. Adaptive digital wireless communications network apparatus and process
US5805633A (en) * 1995-09-06 1998-09-08 Telefonaktiebolaget L M Ericsson Method and apparatus for frequency planning in a multi-system cellular communication network
US5767791A (en) * 1995-11-13 1998-06-16 Vitalcom Low-power circuit and method for providing rapid frequency lock in a wireless communications device
US5815667A (en) * 1995-11-28 1998-09-29 Ncr Corporation Circuits and methods for intelligent acknowledgement based flow control in a processing system network
US5737330A (en) * 1996-01-11 1998-04-07 Meteor Communications Corporation System and method for the efficient control of a radio communications network
US5859840A (en) * 1996-05-31 1999-01-12 Qualcomm Incorporated Spread spectrum communication system which defines channel groups comprising selected channels that are additional to a primary channel and transmits group messages during call set up
US5844900A (en) * 1996-09-23 1998-12-01 Proxim, Inc. Method and apparatus for optimizing a medium access control protocol
US5818828A (en) * 1996-10-04 1998-10-06 Metricom, Inc. Hybrid multiple access protocol for wireless frequency hopping microcells with adaptive backhaul and heartbeat
US6272313B1 (en) * 1997-02-03 2001-08-07 Hughes Electronics Corporation Method and apparatus for in-line detection of satellite signal lock
US5963852A (en) * 1997-03-24 1999-10-05 Ericsson Inc. Dual band mobile station
US6567416B1 (en) * 1997-10-14 2003-05-20 Lucent Technologies Inc. Method for access control in a multiple access system for communications networks
US6023462A (en) * 1997-12-10 2000-02-08 L-3 Communications Corporation Fixed wireless loop system that ranks non-assigned PN codes to reduce interference
US6252861B1 (en) * 1998-03-26 2001-06-26 Lucent Technologies, Inc. Methods and apparatus for interfrequency handoff in a wireless communication system
US6577613B1 (en) * 1999-03-02 2003-06-10 Verizon Corporate Services Group Inc. Method and apparatus for asynchronous reservation-oriented multiple access for wireless networks
US6785252B1 (en) * 1999-05-21 2004-08-31 Ensemble Communications, Inc. Method and apparatus for a self-correcting bandwidth request/grant protocol in a wireless communication system
US6788702B1 (en) * 1999-10-15 2004-09-07 Nokia Wireless Routers, Inc. Protocol for neighborhood-established transmission scheduling
US20050192558A1 (en) * 2004-02-27 2005-09-01 Chf Solutions, Inc. Peripheral access venous cannula with infusion side holes and embedded reinforcement

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7324491B1 (en) * 2003-10-29 2008-01-29 Avaya Technology Llc Method and apparatus for over-the-air bandwidth reservations in wireless networks
US20060059273A1 (en) * 2004-09-16 2006-03-16 Carnevale Michael J Envelope packet architecture for broadband engine
US7975064B2 (en) * 2004-09-16 2011-07-05 International Business Machines Corporation Envelope packet architecture for broadband engine
US7949747B1 (en) * 2006-08-18 2011-05-24 Ecowater Systems Llc Method and system of communication in a wireless water treatment system
US8334787B2 (en) 2007-10-25 2012-12-18 Trilliant Networks, Inc. Gas meter having ultra-sensitive magnetic material retrofitted onto meter dial and method for performing meter retrofit
US8332055B2 (en) 2007-11-25 2012-12-11 Trilliant Networks, Inc. Energy use control system and method
US8144596B2 (en) 2007-11-25 2012-03-27 Trilliant Networks, Inc. Communication and message route optimization and messaging in a mesh network
US8171364B2 (en) 2007-11-25 2012-05-01 Trilliant Networks, Inc. System and method for power outage and restoration notification in an advanced metering infrastructure network
US8725274B2 (en) 2007-11-25 2014-05-13 Trilliant Networks, Inc. Energy use control system and method
US8138934B2 (en) 2007-11-25 2012-03-20 Trilliant Networks, Inc. System and method for false alert filtering of event messages within a network
US8370697B2 (en) 2007-11-25 2013-02-05 Trilliant Networks, Inc. System and method for power outage and restoration notification in an advanced metering infrastructure network
US9621457B2 (en) 2008-09-04 2017-04-11 Trilliant Networks, Inc. System and method for implementing mesh network communications using a mesh network protocol
US8699377B2 (en) 2008-09-04 2014-04-15 Trilliant Networks, Inc. System and method for implementing mesh network communications using a mesh network protocol
US8289182B2 (en) 2008-11-21 2012-10-16 Trilliant Networks, Inc. Methods and systems for virtual energy management display
US8319658B2 (en) 2009-03-11 2012-11-27 Trilliant Networks, Inc. Process, device and system for mapping transformers to meters and locating non-technical line losses
US9189822B2 (en) 2009-03-11 2015-11-17 Trilliant Networks, Inc. Process, device and system for mapping transformers to meters and locating non-technical line losses
US20110053603A1 (en) * 2009-06-10 2011-03-03 Qualcomm Incorporated Systems, apparatus and methods for communicating downlink information
US9106378B2 (en) 2009-06-10 2015-08-11 Qualcomm Incorporated Systems, apparatus and methods for communicating downlink information
US20110243075A1 (en) * 2009-06-16 2011-10-06 Qualcomm Incorporated Method and apparatus for access procedure in a wireless communication system
US9144037B2 (en) 2009-08-11 2015-09-22 Qualcomm Incorporated Interference mitigation by puncturing transmission of interfering cells
US20110190024A1 (en) * 2009-08-11 2011-08-04 Qualcomm Incorporated Interference mitigation by puncturing transmission of interfering cells
US8724563B2 (en) 2009-08-24 2014-05-13 Qualcomm Incorporated Method and apparatus that facilitates detecting system information blocks in a heterogeneous network
US20110205982A1 (en) * 2009-08-24 2011-08-25 Qualcomm Incorporated Method and apparatus that facilitates detecting system information blocks in a heterogeneous network
US20110064037A1 (en) * 2009-09-14 2011-03-17 Qualcomm Incorporated Cross-subframe control channel design
US9277566B2 (en) 2009-09-14 2016-03-01 Qualcomm Incorporated Cross-subframe control channel design
US8942192B2 (en) 2009-09-15 2015-01-27 Qualcomm Incorporated Methods and apparatus for subframe interlacing in heterogeneous networks
US9281932B2 (en) 2009-09-15 2016-03-08 Qualcomm Incorporated Methods and apparatus for subframe interlacing in heterogeneous networks
US10142984B2 (en) 2009-09-15 2018-11-27 Qualcomm Incorporated Methods and apparatus for subframe interlacing in heterogeneous networks
US9271167B2 (en) 2010-04-13 2016-02-23 Qualcomm Incorporated Determination of radio link failure with enhanced interference coordination and cancellation
US9801189B2 (en) 2010-04-13 2017-10-24 Qualcomm Incorporated Resource partitioning information for enhanced interference coordination
US9125072B2 (en) 2010-04-13 2015-09-01 Qualcomm Incorporated Heterogeneous network (HetNet) user equipment (UE) radio resource management (RRM) measurements
US9392608B2 (en) 2010-04-13 2016-07-12 Qualcomm Incorporated Resource partitioning information for enhanced interference coordination
US9282472B2 (en) 2010-04-13 2016-03-08 Qualcomm Incorporated Heterogeneous network (HETNET) user equipment (UE) radio resource management (RRM) measurements
US9226288B2 (en) 2010-04-13 2015-12-29 Qualcomm Incorporated Method and apparatus for supporting communications in a heterogeneous network
US9084120B2 (en) 2010-08-27 2015-07-14 Trilliant Networks Inc. System and method for interference free operation of co-located transceivers
US9013173B2 (en) 2010-09-13 2015-04-21 Trilliant Networks, Inc. Process for detecting energy theft
US8886190B2 (en) 2010-10-08 2014-11-11 Qualcomm Incorporated Method and apparatus for measuring cells in the presence of interference
US8832428B2 (en) 2010-11-15 2014-09-09 Trilliant Holdings Inc. System and method for securely communicating across multiple networks using a single radio
US9282383B2 (en) 2011-01-14 2016-03-08 Trilliant Incorporated Process, device and system for volt/VAR optimization
US8970394B2 (en) 2011-01-25 2015-03-03 Trilliant Holdings Inc. Aggregated real-time power outages/restoration reporting (RTPOR) in a secure mesh network
US8856323B2 (en) 2011-02-10 2014-10-07 Trilliant Holdings, Inc. Device and method for facilitating secure communications over a cellular network
US9041349B2 (en) 2011-03-08 2015-05-26 Trilliant Networks, Inc. System and method for managing load distribution across a power grid
US9001787B1 (en) 2011-09-20 2015-04-07 Trilliant Networks Inc. System and method for implementing handover of a hybrid communications module

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