# US 2021/0345168 A1 · Mobile assisted enhancements to reduce radio resource control (rrc) signaling

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- Number: US 2021/0345168 A1
- Document ID: US20210345168A1
- Status: Published application
- Kind: A1
- Application number: 17/128,719
- Filed: 2020-12-21
- Published: 2021-11-04
- 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/US20210345168A1

## 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 discussed herein can reduce RRC signaling messages, and various aspects can employ one or more of these sets of techniques. A first set of techniques can be employed to reduce RACH (Random Access Channel) requests from a RRC Idle State SIM (Subscriber Identity Module) of a UE in DSDS (Dual SIM Dual Standby) mode. A second set of techniques can be employed to reduce the number of RACH attempts to obtain NotBroadcasted (e.g., On Demand) SI(s) (System Information(s)) by a UE in response to a page message indicating SI modification.

## Claims

### Claim 1

A baseband processor comprising processing circuitry configured to:
determine, via a first Subscriber Identity Module (SIM) of a User Equipment (UE), at least one On Demand System Information (SI) for the first SIM, wherein the first SIM does not have an established Radio Resource Control (RRC) connection; and
generate a request for the at least one On Demand SI via a second SIM in a RRC Connected state, wherein the first SIM and the second SIM are both associated with a common carrier.

### Claim 2 (depends on 1)

The baseband processor of claim 1, wherein the first SIM is in a RRC Idle State when the at least one On Demand SI is determined for the first SIM.

### Claim 3 (depends on 1)

The baseband processor of claim 1, wherein the first SIM is in an acquisition procedure when the at least one On Demand SI is determined for the first SIM.

### Claim 4 (depends on 1)

The baseband processor of claim 1, wherein, when the second SIM is in an RRC Inactive state, the processing circuitry is further configured to buffer an RRC resume procedure for Mobile Originated (MO)-Data for the second SIM for a given duration to enable the second SIM to generate the request for the at least one On Demand SI via the second SIM in the RRC Connected state.

### Claim 5 (depends on 4)

The baseband processor of claim 4, wherein the given duration is based at least in part on a priority of the MO-Data.

### Claim 6 (depends on 1)

The baseband processor of claim 1, wherein the second SIM is configured to remain in the RRC Connected state throughout the determination of the at least one On Demand SI for the first SIM.

### Claim 7 (depends on 6)

The baseband processor of claim 6, wherein the processing circuitry is further configured to buffer an initiated RRC Fast Dormancy procedure for the second SIM until after the request for the at least one On Demand SI is generated.

### Claim 8 (depends on 7)

The baseband processor of claim 7, wherein, in response to obtaining the at least one On Demand SI for the first SIM, the processing circuitry is further configured to perform a RRC Connection release for the second SIM.

### Claim 9

A method, comprising:
processing a Radio Resource Control (RRC) paging message that indicates a System Information (SI) Modification for at least one On Demand SI;
monitoring, in response to the RRC paging message, a Physical Broadcast Channel (PBCH) for a given duration; and
attempting to decode the at least one On Demand SI from the PBCH during the given duration.

### Claim 10 (depends on 9)

The method of claim 9, wherein the given duration is randomly determined.

### Claim 11 (depends on 9)

The method of claim 9, wherein the given duration is fixed.

### Claim 12 (depends on 9)

The method of claim 9, further comprising, in response to the at least one On Demand SI not being successfully decoded during the given duration, initiating a Random Access Channel (RACH) procedure to obtain the at least one On Demand SI.

### Claim 13

A User Equipment (UE), comprising:
first and second Subscriber Identity Modules (SIMs); and
one or more processors configured to:
determine, via the first SIM, at least one On Demand System Information (SI) for the first SIM, wherein the first SIM does not have an established Radio Resource Control (RRC) connection; and
generate a request for the at least one On Demand SI via the second SIM in a RRC Connected state, wherein the first SIM and the second SIM are both associated with a common carrier.

### Claim 14 (depends on 13)

The UE of claim 13, wherein the first SIM is in a RRC Idle state when the at least one On Demand SI is determined for the first SIM.

### Claim 15 (depends on 13)

The UE of claim 13, wherein the first SIM is in an acquisition procedure when the at least one On Demand SI is determined for the first SIM.

### Claim 16 (depends on 13)

The UE of claim 13, wherein, when the second SIM is in an RRC Inactive state, the one or more processors are further configured to buffer an RRC resume procedure for Mobile Originated (MO)-Data for the second SIM for a given duration to enable the second SIM to generate the request for the at least one On Demand SI via the second SIM in the RRC Connected state.

### Claim 17 (depends on 16)

The UE of claim 16, wherein the given duration is based at least in part on a priority of the MO-Data.

### Claim 18 (depends on 13)

The UE of claim 13, wherein the second SIM is configured to remain in the RRC Connected state throughout the determination of the at least one On Demand SI for the first SIM.

### Claim 19 (depends on 18)

The UE of claim 18, wherein the one or more processors are further configured to buffer an initiated RRC Fast Dormancy procedure for the second SIM until after the request for the at least one On Demand SI is generated.

### Claim 20 (depends on 19)

The UE of claim 19, wherein, in response to obtaining the at least one On Demand SI for the first SIM, the one or more processors are further configured to perform a RRC Connection release for the second SIM.