# US 12,004,007 B2 · Mobile assisted enhancements to reduce radio resource control (RRC) signaling

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- Number: US 12,004,007 B2
- Document ID: US12004007B2
- Status: Granted
- Kind: B2
- Application number: 17/887,586
- Filed: 2022-08-15
- Published: 2022-12-08
- Granted: 2024-06-04
- Earliest claimed: 2020-04-29
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Muthukumaran Dhanapal; Shravan Raghunathan; Sai Kiran Gummuluri; Hussain Ali; Lakshmi Kavuri; Vijay Venkataraman
- Web page: https://patentgrep.com/patent/US12004007B2

## CPC

- H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)}
- H04W 48/14: using user query {or user detection}
- H04W 8/20: Transfer of user or subscriber data
- H04W 68/005: {Transmission of information for alerting of incoming communication}
- H04W 72/30: Resource management for broadcast services
- H04W 76/19: Connection re-establishment
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/30: Connection release
- H04W 8/183: {Processing at user equipment or user record carrier}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 76/15: Setup of multiple wireless link connections
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Techniques disclosed herein relate to reducing RRC signalling messages. Techniques can be employed to reduce the number of Random Access Channel (RACH) attempts to obtain NotBroadcasted (e.g., On Demand System Information(s) (SIs)) by a UE in response to a paging message indicating SI modification. The UE may monitor the Physical Broadcast Channel (PBCH) for a given duration in attempt to decode the On Demand SI(s) without initiating a RACH procedure. If the UE fails to decode the On Demand SI(s) within the given duration, the UE may initiate a RACH procedure to obtain the On Demand SI(s).

## Claims

### Claim 1

A method to be performed by a User Equipment (UE), comprising:
receiving a Radio Resource Control (RRC) paging message from a base station that indicates a System Information (SI) modification for at least one On Demand SI;
in response to the RRC paging message, monitoring a broadcast channel for a given duration without initiating a Random Access Channel (RACH) procedure to obtain the at least one On Demand SI, wherein the given duration begins upon receiving the RRC paging message;
attempting to decode the at least one On Demand SI from the broadcast channel during the given duration; and
if the On Demand SI is not successfully decoded during the given duration, initiating the RACH procedure with the base station to obtain the at least one On Demand SI.

### Claim 2 (depends on 1)

The method of claim 1, wherein the given duration is randomly determined within a predefined range.

### Claim 3 (depends on 1)

The method of claim 1, wherein the given duration is predefined.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
if the On Demand SI is successfully decoded during the given duration, back off initiating the RACH procedure with the base station to obtain the at least On Demand SI.

### Claim 5

An apparatus for a User Equipment (UE), comprising:
one or more processors configured to:
receive a Radio Resource Control (RRC) paging message from a base station that indicates a System Information (SI) modification for at least one On Demand SI;
monitor, in response to the RRC paging message, a broadcast channel for a given duration for receiving the at least one On Demand SI, without sending a request to the base station for the at least one On Demand SI during the given duration, wherein the given duration begins upon receiving the RRC paging message;
attempt to decode the at least one On Demand SI from the broadcast channel during the given duration; and
if the at least one On Demand SI is not successfully decoded during the given duration, send a request to the base station for the at least one On Demand SI.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the given duration is randomly determined within a predefined range.

### Claim 7 (depends on 5)

The apparatus of claim 5, wherein the given duration is predefined.