# US 11,115,893 B2 · Information transmission method, base station, and user equipment

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- Number: US 11,115,893 B2
- Document ID: US11115893B2
- Status: Granted
- Kind: B2
- Application number: 16/521,383
- Filed: 2019-07-24
- Published: 2019-11-14
- Granted: 2021-09-07
- Earliest claimed: 2017-01-26
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Wenjie Peng; Mingzeng Dai
- Web page: https://patentgrep.com/patent/US11115893B2

## CPC

- H04W 36/0033: {with transfer of context information}
- H04W 36/08: Reselecting an access point
- H04W 36/144: {over a different radio air interface technology}
- H04W 36/322: {by location data}
- H04W 76/11: Allocation or use of connection identifiers
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04L 61/5038: for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
- H04W 52/0229: {where the received signal is a wanted signal}
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

The present application provides an information transmission method. A first base station sends a context of a terminal to a second base station according to a request of the second base station. The request message of the second base station includes a first identifier, the first identifier is an identifier of the terminal in a non-connected mode in an area configured by the first base station, and the context of the terminal includes a core network-related context. The second base station may perform a corresponding RRC configuration based on the obtained context of the terminal. The first base station uses a RAT different from the second base station.

## Claims

### Claim 1

A method comprising:
receiving, by a terminal, a first indication from a first base station of a first radio access technology (RAT), wherein the first indication comprises a first identifier allocated by the first base station to the terminal, the first indication instructs the terminal to enter a non-connected mode, and the first identifier identifies the terminal in the non-connected mode in an area configured by the first base station;
upon receiving the first indication, entering, by the terminal, the non-connected mode, and retaining, by the terminal, a radio resource control (RRC) context corresponding to the first RAT:
sending, by the terminal in the non-connected mode, the first identifier to a second base station of a second RAT for the second base station to use to request a context of the terminal from the first base station;
in response to determining that the second RAT is different than the first RAT, releasing, by the terminal, the RRC context corresponding to the first RAT before establishing a RRC connection with the second base station; and
performing, by the terminal after sending the first identifier to the second base station, the RRC connection with the second base station based on RRC configuration information corresponding to the second RAT received from the second base station.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the context of the terminal comprises a core network-related context.

### Claim 3 (depends on 2)

The method according claim 2, wherein the context of the terminal further comprises at least one of: the RRC context of the terminal corresponding to the first RAT, or a RRC context of the terminal corresponding to the second RAT.

### Claim 4 (depends on 1)

The method according to claim 1, wherein releasing the RRC context corresponding to the first RAT comprises:
releasing, by the terminal, the RRC context corresponding to the first RAT without releasing security configuration information, and retaining, by the terminal, a core network-related context.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the method further comprises:
retaining, by the terminal, a RRC context corresponding to the first RAT and a core network—related context.

### Claim 6 (depends on 1)

The method according to claim 1, wherein sending, by the terminal, the first identifier to the second base station comprises:
sending, by the terminal, an area update message to the second base station, wherein the area update message comprises the first identifier.

### Claim 7

An apparatus for a terminal, comprising:
a non-transitory memory storage comprising instructions; and
one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to cause the apparatus to:
receive a first indication from a first base station of a first radio access technology (RAT), wherein the first indication comprises a first identifier allocated by the first base station to the terminal, the first indication instructs the terminal to enter a non-connected mode, and the first identifier identifies the terminal in the non-connected mode in an area configured by the first base station;
upon receiving the first indication, enter the non-connected mode and retain a radio resource control (RRC) context corresponding to the first RAT;
send, with the terminal being in the non-connected mode, the first identifier to a second base station of a second RAT for the second base station to use to request a context of the terminal from the first base station;
in response to determining that the second RAT is different than the first RAT, release the RRC context corresponding to the first RAT before establishing a RRC connection with the second base station; and
perform, after sending the first identifier to the second base station, the RRC connection with the second base station based on RRC configuration information corresponding to the second RAT received from the second base station.

### Claim 8 (depends on 7)

The apparatus according to claim 7, wherein the context of the terminal comprises a core network-related context.

### Claim 9 (depends on 8)

The apparatus according claim 8, wherein the context of the terminal further comprises at least one of the RRC context of the terminal corresponding to the first RAT, or a second-RAT RRC context of the terminal corresponding to the second RAT.

### Claim 10 (depends on 7)

The apparatus according to claim 7, wherein the one or more processors execute the instructions further to:
release the RRC context corresponding to the first RAT without releasing security configuration information, and retain a core networkrelated context.

### Claim 11 (depends on 7)

The terminal according to claim 7, wherein the one or more processors execute the instructions further to:
retain a RRC context corresponding to the first RAT and a core network-related context.

### Claim 12 (depends on 7)

The terminal according to claim 7, wherein the one or more processors execute the instructions further to:
send an area update message to the second base station, wherein the area update message comprises the first identifier.

### Claim 13

A non-transitory processor-readable medium having processor-executable instructions stored thereon for a terminal, the processor-executable instructions, when executed by a processor, to cause the terminal to perform:
receiving a first indication from a first base station of a first RAT, wherein the first indication comprises a first identifier allocated by the first base station to the terminal, the first indication instructs the terminal to enter a non-connected mode, and the first identifier identifies the terminal in the non-connected mode in an area configured by the first base station;
upon receiving the first indication, entering the non-connected mode, and retaining a RRC context corresponding to the first RAT;
sending, with the terminal being in the non-connected mode, the first identifier to a second base station of a second RAT for the second base station to use to request a context of the terminal from the first base station;
in response to determining that the second RAT is different than the first RAT, releasing the RRC context corresponding to the first RAT before establishing a RRC connection with the second base station; and
performing, after sending the first identifier to the second base station, the RRC connection with the second base station based on RRC configuration information corresponding to the second RAT received from the second base station.

### Claim 14 (depends on 13)

The non-transitory processor-readable medium according to claim 13, wherein the context of the terminal comprises a core network-related context.

### Claim 15 (depends on 14)

The non-transitory processor-readable medium according claim 14, wherein the context of the terminal further comprises at least one of the RRC context of the terminal corresponding to the first RAT, or a RRC context of the terminal corresponding to the second RAT.

### Claim 16 (depends on 13)

The non-transitory processor-readable medium according to claim 13, further comprising instructions that, when executed by the processor, cause the terminal to perform: releasing the RRC context corresponding to the first RAT without releasing security configuration information, and retaining a core network-related context.

### Claim 17 (depends on 13)

The non-transitory processor-readable medium according to claim 13, further comprising instructions that, when executed by the processor, cause the terminal to perform: retaining a RRC context corresponding to the first RAT and a core network-related context.

### Claim 18 (depends on 13)

The non-transitory processor-readable medium according to claim 13, wherein sending the first identifier to the second base station comprises:
sending an area update message to the second base station, wherein the area update message comprises the first identifier.