# US 10,321,434 B1 · Managing signaling resources using hidden public land mobile network signals

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- Number: US 10,321,434 B1
- Document ID: US10321434B1
- Status: Granted
- Kind: B1
- Application number: 14/972,423
- Filed: 2015-12-17
- Granted: 2019-06-11
- Earliest claimed: 2015-12-17
- Assignees: Sprint Communications Company L.P.
- Applicants: Sprint Communications Company L.P.
- Inventors: Siddharth Oroskar; Jasinder Pal Singh; Rajil Malhotra; Nitesh Manchanda
- Web page: https://patentgrep.com/patent/US10321434B1

## CPC

- H04W 72/04: Wireless resource allocation
- H04B 7/2606: {Arrangements for base station coverage control, e.g. by using relays in tunnels}
- H04W 36/06: Reselecting a communication resource in the serving access point
- H04W 68/00: User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 36/00: Hand-off or reselection arrangements
- H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions}
- H04W 36/0083: {Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists}
- H04W 36/008357: {Determination of target cell based on access point [AP] properties, e.g. AP service capabilities}
- H04W 36/14: Reselecting a network or an air interface
- H04W 48/02: Access restriction performed under specific conditions
- H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00)
- H04W 48/12: using downlink control channel
- H04W 48/18: Selecting a network or a communication service
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 84/047: {using dedicated repeater stations}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

The technology disclosed herein enhances the management of signaling resources of a wireless provider network using hidden public land mobile network (PLMN) signals. In one implementation, a Long Term Evolution (LTE) access node provides hidden and non-hidden PLMNs to wireless communication devices. During the communications for the wireless communication devices, the LTE access node identifies a transition condition for the network and a physical cell identifier (PCI) associated with a hidden PLMN. Once the PCI is identified, the PCI is provided to at least a subset of the wireless communication devices, permitting the subset to communicate using channels associated with the hidden PLMN.

## Claims

### Claim 1

A method of operating a wireless communication network to communicate with a wireless communication device, the method comprising:
a wireless access node wirelessly broadcasting an available user Public Land Mobile Network (PLMN) and an available relay PLMN;
a wireless relay wirelessly receiving the available user PLMN and the available relay PLMN and wirelessly broadcasting the available user PLMN;
the wireless relay wirelessly exchanging user data with the wireless communication device over the available user PLMN and exchanging the user data with the wireless access node over the available relay PLMN;
the wireless access node detecting a network condition, and in response, wirelessly directing the wireless relay to use a specific Physical Cell Identifier (PCI) associated with an unavailable relay PLMN and an unavailable user PLMN;
the wireless relay wirelessly directing the wireless communication device to use the specific PCI associated with the unavailable user PLMN responsive to the direction from the wireless access node; and
the wireless relay wirelessly exchanging user data with the wireless communication device over a selective channel in the unavailable user PLMN and exchanging the user data with the wireless access node over another selective channel in the unavailable relay PLMN.

### Claim 2 (depends on 1)

The method of claim 1 wherein the wireless access node detecting the network condition comprises determining quality-of-service.

### Claim 3 (depends on 1)

The method of claim 1 wherein the wireless access node detecting the network condition comprises determining carrier aggregation load.

### Claim 4

A wireless communication network to communicate with a wireless communication device, the wireless communication network comprising:
a wireless access node configured to wirelessly broadcast an available user Public Land Mobile Network (PLMN) and an available relay PLMN;
a wireless relay configured to wirelessly receive the available user PLMN and the available relay PLMN and to wirelessly broadcast the available user PLMN;
the wireless relay configured to wirelessly exchange user data with the wireless communication device over the available user PLMN and exchange the user data with the wireless access node over the available relay PLMN;
the wireless access node configured to detect a network condition, and in response, wirelessly direct the wireless relay to use a specific Physical Cell Identifier (PCI) associated with an unavailable relay PLMN and an unavailable user PLMN;
the wireless relay configured to wirelessly direct the wireless communication device to use the specific PCI associated with the unavailable user PLMN in response to the direction from the wireless access node; and
the wireless relay configured to wirelessly exchange user data with the wireless communication device over a selective channel in the unavailable user PLMN and exchange the user data with the wireless access node over another selective channel in the unavailable relay PLMN.

### Claim 5 (depends on 4)

The wireless communication network of claim 4 wherein the wireless access node is configured to detect the network condition by determining quality-of-service.

### Claim 6 (depends on 4)

The wireless communication network of claim 4 wherein the wireless access node is configured to detect the network condition by determining carrier aggregation load.