# US 2013/0155981 A1 · Method and apparatus for re-synchronizing of temporary ue ids in a wireless communication system

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- Number: US 2013/0155981 A1
- Document ID: US20130155981A1
- Status: Published application
- Kind: A1
- Application number: 13/764,611
- Filed: 2013-02-11
- Published: 2013-06-20
- Earliest claimed: 2009-03-03
- Assignees: QUALCOMM Incorporated
- Inventors: Masato Kitazoe
- Web page: https://patentgrep.com/patent/US20130155981A1

## CPC

- H04W 8/26: Network addressing or numbering for mobility support
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 74/0866: {using a dedicated channel for access}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods and apparatuses for re-synchronizing Cell Radio Network Temporary Identifiers (C-RNTIs) in a wireless communication system are disclosed. In an aspect, a random access preamble is sent for random access by a user equipment (UE) and a random access response (RAR) is received that includes a temporary C-RNTI. If the UE already has a valid C-RNTI, a message is sent that includes the valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for the UE. In another aspect, a random access preamble for random access is received and a RAR is sent that includes a temporary C-RNTI. A message is received that includes a valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for a UE if the UE already has the valid C-RNTI.

## Claims

### Claim 1

A method for wireless communication, comprising:
sending a random access preamble for random access by a user equipment (UE);
receiving a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI); and
if the UE already has a valid C-RNTI, sending a message that includes the valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for the UE.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
receiving a downlink transmission that is addressed to the valid C-RNTI; and
discarding the temporary C-RNTI.

### Claim 3 (depends on 1)

The method of claim 1, wherein the sending the message comprises sending message 3 of a random access procedure, the message 3 including the valid C-RNTI as the C-RNTI for the UE.

### Claim 4 (depends on 1)

The method of claim 1, further comprising, if the UE does not already have the valid C-RNTI prior to the random access:
sending an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI;
receiving a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity; and
setting the C-RNTI for the UE to a value of the temporary C-RNTI if the UE contention resolution identity matches the information in the uplink transmission.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
receiving the valid C-RNTI from a source base station prior to the random access;
wherein the sending the random access preamble comprises sending the random access preamble for handover from the source base station to a target base station; and
wherein the receiving the RAR comprises receiving the RAR that includes the temporary C-RNTI from the target base station.

### Claim 6

An apparatus for wireless communication, comprising:
at least one processor configured to:
send a random access preamble for random access by a user equipment (UE),
receive a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI), and
if the UE already has a valid C-RNTI, send a message that includes the valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for the UE; and
a memory coupled to the at least one processor.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the at least one processor is configured to:
receive a downlink transmission that is addressed to the valid C-RNTI; and
discard the temporary C-RNTI.

### Claim 8 (depends on 6)

The apparatus of claim 6, wherein the at least one processor is configured to send message 3 of a random access procedure, the message 3 including the valid C-RNTI as the C-RNTI for the UE.

### Claim 9 (depends on 6)

The apparatus of claim 6, wherein the at least one processor is configured to, if the UE does not already have the valid C-RNTI prior to the random access:
send an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI,
receive a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity, and
set the C-RNTI for the UE to a value of the temporary C-RNTI if the UE contention resolution identity matches the information in the uplink transmission.

### Claim 10 (depends on 6)

The apparatus of claim 6, wherein the at least one processor is configured to:
receive the valid C-RNTI from a source base station prior to the random access,
send the random access preamble for handover from the source base station to a target base station, and
receive the RAR from the target base station.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein the valid C-RNTI is assigned by the target base station, sent to the source base station, and forwarded by the source base station in a handover command.

### Claim 12 (depends on 6)

The apparatus of claim 6, wherein the at least one processor is configured to:
send the random access preamble for transition from an idle state to an active state if the UE does not already have the valid C-RNTI prior to the random access, and
use the temporary C-RNTI as the C-RNTI for the UE.

### Claim 13

An apparatus for wireless communication, comprising:
means for sending a random access preamble for random access by a user equipment (UE);
means for receiving a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI); and
if the UE already has a valid C-RNTI, means for sending a message that includes the valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for the UE.

### Claim 14 (depends on 13)

The apparatus of claim 13, further comprising:
means for receiving a downlink transmission that is addressed to the valid C-RNTI; and
means for discarding the temporary C-RNTI.

### Claim 15 (depends on 13)

The apparatus of claim 13, further comprising, if the UE does not already have the valid C-RNTI prior to the random access:
means for sending an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI;
means for receiving a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity; and
means for setting the C-RNTI for the UE to a value of the temporary C-RNTI if the UE contention resolution identity matches the information in the uplink transmission.

### Claim 16 (depends on 13)

The apparatus of claim 13, further comprising:
means for receiving the valid C-RNTI from a source base station prior to the random access;
wherein the means for sending the random access preamble comprises means for sending the random access preamble for handover from the source base station to a target base station; and
wherein the means for receiving the RAR comprises means for receiving the RAR that includes the temporary C-RNTI from the target base station.

### Claim 17 (depends on 13)

The apparatus of claim 13, wherein the means for sending the random access preamble comprises means for sending the random access preamble for timing synchronization update if the UE already has the valid C-RNTI prior to the random access.

### Claim 18

A computer program product, comprising a non-transitory computer-readable medium that includes:
code for causing at least one computer to send a random access preamble for random access by a user equipment (UE);
code for causing the at least one computer to receive a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI); and
if the UE already has a valid C-RNTI, code for causing the at least one computer to send a message that includes the valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for the UE.

### Claim 19 (depends on 18)

The computer program product of claim 18, wherein the non-transitory computer-readable medium further comprises:
code for causing the at least one computer to receive a downlink transmission that is addressed to the valid C-RNTI; and
code for causing the at least one computer to discard the temporary C-RNTI.

### Claim 20 (depends on 18)

The computer program product of claim 18, wherein the non-transitory computer-readable medium further comprises, if the UE does not already have the valid C-RNTI prior to the random access:
code for causing the at least on computer to send an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI;
code for causing the at least on computer to receive a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity; and
code for causing the at least on computer to set the C-RNTI for the UE to a value of the temporary C-RNTI if the UE contention resolution identity matches the information in the uplink transmission.

### Claim 21

A method for wireless communication, comprising:
receiving a random access preamble for random access;
sending a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI); and
receiving a message that includes a valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for a user equipment (UE) if the UE already has the valid C-RNTI.

### Claim 22 (depends on 21)

The method of claim 21, further comprising:
determining, based on the received message, that the UE already has the valid C-RNTI prior to the random access;
releasing the temporary C-RNTI based on the determination; and
sending a downlink transmission that is addressed to the valid C-RNTI.

### Claim 23 (depends on 21)

The method of claim 21, further comprising:
receiving an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI prior to the random access; and
sending a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity that corresponds with the information in the uplink transmission.

### Claim 24 (depends on 21)

The method of claim 21, further comprising:
receiving, from a source base station, a handover request for the UE;
assigning the valid C-RNTI to the UE in response to the handover request; and
sending, to the source base station, the valid C-RNTI for forwarding to the UE, wherein the random access preamble is received from the UE for handover from the source base station to a target base station.

### Claim 25

An apparatus for wireless communication, comprising:
at least one processor configured to:
receive a random access preamble for random access,
send a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI), and
receive a message that includes a valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for a user equipment (UE) if the UE already has the valid C-RNTI; and
a memory coupled to the at least one processor.

### Claim 26 (depends on 25)

The apparatus of claim 25, wherein the at least one processor is configured to:
determine, based on the received message, that the UE already has the valid C-RNTI prior to the random access,
release the temporary C-RNTI based on the determination, and
send a downlink transmission that is addressed to the valid C-RNTI.

### Claim 27 (depends on 25)

The apparatus of claim 25, wherein the at least one processor is configured to:
receive an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI prior to the random access, and
send a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity that corresponds with the information in the uplink transmission.

### Claim 28 (depends on 25)

The apparatus of claim 25, wherein the at least one processor is configured to:
receive, from a source base station, a handover request for the UE,
assign the valid C-RNTI to the UE in response to the handover request,
send, to the source base station, the valid C-RNTI for forwarding to the UE, and
receive, from the UE, the random access preamble for handover from the source base station to a target base station.

### Claim 29

An apparatus for wireless communication, comprising:
means for receiving a random access preamble for random access;
means for sending a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI); and
means for receiving a message that includes a valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for a user equipment (UE) if the UE already has the valid C-RNTI.

### Claim 30 (depends on 29)

The apparatus of claim 29, further comprising:
means for determining, based on the received message, that the UE already has the valid C-RNTI prior to the random access;
means for releasing the temporary C-RNTI based on the determination; and
means for sending a downlink transmission that is addressed to the valid C-RNTI.

### Claim 31 (depends on 29)

The apparatus of claim 29, further comprising:
means for receiving an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI prior to the random access; and
means for sending a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity that corresponds with the information in the uplink transmission.

### Claim 32 (depends on 29)

The apparatus of claim 29, further comprising:
means for receiving, from a source base station, a handover request for the UE;
means for assigning the valid C-RNTI to the UE in response to the handover request; and
means for sending, to the source base station, the valid C-RNTI for forwarding to the UE, wherein the random access preamble is received from the UE for handover from the source base station to a target base station.

### Claim 33

A computer program product, comprising a non-transitory computer-readable medium that includes:
code for causing at least one computer to receive a random access preamble for random access;
code for causing the at least one computer to send a random access response (RAR) that includes a temporary Cell Radio Network Temporary Identifier (C-RNTI); and
code for causing the at least one computer to receive a message that includes a valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for a user equipment (UE) if the UE already has the valid C-RNTI.

### Claim 34 (depends on 33)

The computer program product of claim 33, wherein the non-transitory computer-readable medium further comprises:
code for causing the at least one computer to determine, based on the received message, that the UE already has the valid C-RNTI prior to the random access,
code for causing the at least one computer to release the temporary C-RNTI based on the determination, and
code for causing the at least one computer to send, a downlink transmission that is addressed to the valid C-RNTI.

### Claim 35 (depends on 33)

The computer program product of claim 33, wherein the non-transitory computer-readable medium further comprises:
code for causing the at least one computer to receive an uplink transmission that includes information indicating that the UE does not already have the valid C-RNTI prior to the random access, and
code for causing the at least one computer to send a downlink transmission that is addressed to the temporary C-RNTI, the downlink transmission including a UE contention resolution identity that corresponds with the information in the uplink transmission.