# US 2019/0174394 A1 · Prioritization of Mobile Terminating Radio Resource Control Connections

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- Number: US 2019/0174394 A1
- Document ID: US20190174394A1
- Status: Published application
- Kind: A1
- Application number: 15/833,933
- Filed: 2017-12-06
- Published: 2019-06-06
- Earliest claimed: 2017-12-06
- Assignees: T-Mobile USA, Inc.
- Applicants: T-Mobile USA, Inc.
- Inventors: Kun Lu; Neng-Tsann Ueng
- Web page: https://patentgrep.com/patent/US20190174394A1

## CPC

- H04W 72/56: based on priority criteria
- H04W 28/0231: {based on communication conditions (dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54)}
- H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)}
- H04W 28/0284: {detecting congestion or overload during communication (monitoring arrangements H04L43/00)}
- H04W 48/06: based on traffic conditions
- H04W 68/02: Arrangements for increasing efficiency of notification or paging channel
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/51: based on terminal or device properties
- H04W 76/10: Connection setup
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A connection between mobile terminating (MT) user equipment (UE) and a base station can be established by receiving a paging message at the MT UE from the base station that includes a page reason indicator indicating that the MT UE is being paged for a voice call, and, at least partially in response to receipt of the paging message, sending a Radio Resource Control (RRC) Connection Request message from the MT UE to the base station that includes an establishment cause indicating that the MT UE is requesting a connection with the base station for the voice call. The establishment cause indicating that the MT UE is requesting a connection for a voice call can allow the base station to prioritize the MT UE's RRC Connection Request message over RRC Connection Request messages from other UEs in congested conditions.

## Claims

### Claim 1

A method of establishing a connection between mobile terminating user equipment and a base station, comprising:
receiving, by a mobile terminating (MT) user equipment (UE) from a base station, a paging message that includes a page reason indicator indicating that the MT UE is being paged for a voice call; and
at least partially in response to receipt of the paging message, sending, by the MT UE to the base station, a Radio Resource Control (RRC) Connection Request message including an establishment cause indicating that the MT UE is requesting a connection with the base station for the voice call.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
receiving, by the MT UE from the base station, an RRC Connection Setup message in response to the RRC Connection Request message;
establishing the connection between the MT UE and the base station in response to the RRC Connection Setup message; and
using the connection to participate in the voice call between the MT UE and a mobile originating (MO) UE.

### Claim 3 (depends on 2)

The method of claim 2, wherein the base station is experiencing congestion and sent the RRC Connection Setup message based on a determination that the establishment cause in the RRC Connection Request message indicating that the MT UE is requesting the connection for the voice call has a higher priority than establishment causes in one or more other RRC Connection Request messages pending at the base station.

### Claim 4 (depends on 2)

The method of claim 2, wherein the MO UE established a separate connection with the base station or another base station for the voice call using another RRC Connection Request message that included another establishment cause indicating that the MO UE requested the separate connection with the base station or the other base station for the voice call.

### Claim 5 (depends on 1)

The method of claim 1, further comprising determining, by the MT UE, that the paging message includes a unique identifier for the MT UE tied to the page reason indicator indicating that the MT UE is being paged for the voice call.

### Claim 6 (depends on 1)

The method of claim 1, wherein the base station is an eNode B of an LTE network.

### Claim 7

A method of establishing a connection between mobile terminating user equipment and a base station, comprising:
transmitting, by a base station, a paging message that includes a page reason indicator indicating that a mobile terminating (MT) user equipment (UE) is being paged for a voice call;
receiving, by the base station from the MT UE, a Radio Resource Control (RRC) Connection Request message including an establishment cause indicating that the MT UE is requesting a connection with the base station for the voice call;
determining, by the base station in congested conditions, that the RRC Connection Request message has a higher priority than one or more other RRC Connection Request messages pending at the base station, based on a determination that the establishment cause in the RRC Connection Request message indicating that the MT UE is requesting the connection for the voice call has a higher priority than establishment causes in the one or more other RRC Connection Request messages; and
sending, by the base station to the MT UE, an RRC Connection Setup message to the MT UE.

### Claim 8 (depends on 7)

The method of claim 7, further comprising:
establishing the connection for the voice call between the base station and the MT UE in response to the RRC Connection Setup message; and
using the connection to transmit data for the voice call between the MT UE and a mobile originating (MO) UE.

### Claim 9 (depends on 8)

The method of claim 8, wherein the wherein the MO UE established a separate connection with the base station or another base station for the voice call using another RRC Connection Request message that included another establishment cause indicating that the MO UE requested the separate connection with the base station or the other base station for the voice call.

### Claim 10 (depends on 7)

The method of claim 7, wherein the paging message includes a unique identifier for the MT UE tied to the page reason indicator indicating that the MT UE is being paged for the voice call.

### Claim 11 (depends on 7)

The method of claim 7, wherein the base station transmits the paging message at least in part in response to an indication from a Mobility Management Entity (MME) of a core network that the MT UE is being paged for a voice call.

### Claim 12 (depends on 7)

The method of claim 7, wherein the base station is an eNode B of an LTE network.

### Claim 13 (depends on 7)

The method of claim 7, further comprising:
sending, by the base station to a second UE, an RRC Connection Reject message,
wherein the RRC Connection Reject message is sent in response to:
a determination that one of the one or more other RRC Connection Request messages sent by the second UE had an establishment cause with a lower priority than the establishment cause in the RRC Connection Request message indicating that the MT UE is requesting the connection for the voice call, and
a determination that the base station does not have sufficient resources to establish a separate connection with the second UE due to the congested conditions.

### Claim 14 (depends on 7)

The method of claim 7, wherein the base station has a prioritized list indicating that an establishment cause associated with an MT voice call has a higher priority that another establishment cause associated with general MT access.

### Claim 15

A mobile terminating (MT) user equipment (UE), comprising:
one or more processors;
a radio interface; and
memory storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
receiving, from a base station via the radio interface, a paging message that includes a page reason indicator indicating that the MT UE is being paged for a voice call; and
at least partially in response to receipt of the paging message, sending, to the base station via the radio interface, a Radio Resource Control (RRC) Connection Request message including an establishment cause indicating that a connection with the base station is being requested for the voice call.

### Claim 16 (depends on 15)

The MT UE of claim 15, wherein the operations further comprise:
receiving, from the base station via the radio interface, an RRC Connection Setup message in response to the RRC Connection Request message;
establishing, via the radio interface, the connection with the base station in response to the RRC Connection Setup message; and
using the connection, via the radio interface, to participate in the voice call with a mobile originating (MO) UE.

### Claim 17 (depends on 15)

The ME UE of claim 15, wherein the base station is experiencing congestion and sent the RRC Connection Setup message based on a determination that the establishment cause in the RRC Connection Request message indicating that the MT UE is requesting the connection for the voice call has a higher priority than establishment causes in one or more other RRC Connection Request messages pending at the base station.

### Claim 18 (depends on 15)

The ME UE of claim 15, wherein the MO UE established a separate connection with the base station or another base station for the voice call using another RRC Connection Request message that included another establishment cause indicating that the MO UE requested the separate connection with the base station or the other base station for the voice call.

### Claim 19 (depends on 15)

The ME UE of claim 15, wherein the operations further comprise determining that the paging message includes a unique identifier for the MT UE tied to the page reason indicator indicating that the MT UE is being paged for the voice call.

### Claim 20 (depends on 15)

The ME UE of claim 15, wherein the base station is an eNode B of an LTE network.