# US 9,438,436 B2 · Broadcast anchor availability indication

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- Number: US 9,438,436 B2
- Document ID: US9438436B2
- Status: Granted
- Kind: B2
- Application number: 11/503,661
- Filed: 2006-08-14
- Published: 2008-02-28
- Granted: 2016-09-06
- Earliest claimed: 2006-08-14
- Assignees: Alcatel Lucent
- Applicants: Alessio Casati; Sudeep Palat; Said Tatesh
- Inventors: Alessio Casati; Sudeep Palat; Said Tatesh
- Web page: https://patentgrep.com/patent/US9438436B2

## CPC

- H04L 12/1877: {Measures taken prior to transmission}
- H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A multicast status availability indication from an anchor (24) is provided to a plurality of base nodes (22) that are part of a multicast group serviced by the anchor (24). The availability status indication in one example is sent autonomously by the anchor (24) independent of any inquiry or attempted setup of a new session with that anchor by a base mode (22). The base modes (22) maintain a candidate anchor set that includes information regarding currently available anchors for establishing new sessions, for example.

## Claims

### Claim 1

A method of communicating, comprising the steps of:
providing a flat architecture Internet Protocol cellular communication system in which base nodes have base station controller capability and there are no radio network controllers (RNCs); and
using a broadcast availability status indication from an anchor that is distinct from a RNC to a plurality of base nodes for self-configuring a candidate anchor set at each of the base nodes, each candidate anchor set including currently available anchors for the corresponding base node, each of the base nodes being configured to communicate with the anchor and configured to communicate directly with an end user device, the anchor being configured to communicate with the base nodes and a network such that the anchor is an interface between the base nodes and the network;
wherein the availability status indication comprises an indication that the anchor is unavailable.

### Claim 2

A method of communicating, comprising the steps of:
providing a flat architecture Internet Protocol cellular communication system in which base nodes have base station controller capability and there are no radio network controllers (RNCs); and
using a broadcast availability status indication from an anchor that is distinct from a RNC to a plurality of base nodes for self-configuring a candidate anchor set at each of the base nodes, each candidate anchor set including currently available anchors for the corresponding base node, each of the base nodes being configured to communicate with the anchor and configured to communicate directly with an end user device, the anchor being configured to communicate with the base nodes and a network such that the anchor is an interface between the base nodes and the network;
broadcasting the availability status indication periodically at each of a plurality of times spaced by a regular interval; and
broadcasting the availability status indication at another time responsive to a change in the availability of the anchor.

### Claim 3

A method of communicating, comprising the steps of:
providing a flat architecture Internet Protocol cellular communication system in which base nodes have base station controller capability and there are no radio network controllers (RNCs); and
using a broadcast availability status indication from an anchor that is distinct from a RNC to a plurality of base nodes for self-configuring a candidate anchor set at each of the base nodes, each candidate anchor set including currently available anchors for the corresponding base node, each of the base nodes being configured to communicate with the anchor and configured to communicate directly with an end user device, the anchor being configured to communicate with the base nodes and a network such that the anchor is an interface between the base nodes and the network;
wherein the availability status indication includes information regarding a future time when the anchor will become unavailable.

### Claim 4

A communication system having a decentralized architecture, comprising
a plurality of base nodes, each being configured for communicating with an end user device, the base nodes being part of a flat architecture Internet Protocol cellular communication system in which the base nodes have base station controller capability and there are no radio network controllers (RNCs); and
at least one anchor that is distinct from a RNC, the at least one anchor communicates with the plurality of base nodes and communicates with a network such that the at least one anchor is an interface between the base nodes and the network, the at least one anchor broadcasts an availability status indication to the plurality of base nodes, each of the plurality of base nodes self-configuring a candidate anchor set at each of the base nodes responsive to receiving the broadcast availability status indication, each candidate anchor set including currently available anchors for the corresponding base node;
wherein the availability status indication includes information regarding a future time when the at least one anchor will become unavailable.