# US 8,787,957 B2 · Methods and procedures for high speed UE access

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- Number: US 8,787,957 B2
- Document ID: US8787957B2
- Status: Granted
- Kind: B2
- Application number: 11/958,118
- Filed: 2007-12-17
- Published: 2008-08-14
- Granted: 2014-07-22
- Earliest claimed: 2007-02-12
- Assignees: LG Electronics Inc.
- Applicants: Dragan Vujcic; Yeong Hyeon Kwon
- Inventors: Dragan Vujcic; Yeong Hyeon Kwon
- Web page: https://patentgrep.com/patent/US8787957B2

## CPC

- H04W 74/0866: {using a dedicated channel for access}
- H04J 13/0062: {Zadoff-Chu}
- H04W 48/12: using downlink control channel
- H04W 74/004: {in the uplink, i.e. towards network}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

A terminal random access procedure is improved by allowing a mobile terminal to correctly map signature indexes onto cyclic shifted Zadoff-Chu (ZC) sequences when the deployed cells support a high-speed mobility by informing a mobile terminal whether a cell supports high-speed mobility.

## Claims

### Claim 1

A method of establishing a communication link between a mobile terminal and a network, the method comprising:
receiving, by the mobile terminal, a high-speed related parameter from the network, the high-speed related parameter representing either ‘TRUE’ or ‘FALSE’, wherein TRUE corresponds to a restricted set of cyclic shifts and FALSE corresponds to an unrestricted set of cyclic shifts;
if the high-speed related parameter represents TRUE,
generating, by the mobile terminal, a first plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones using the restricted set of cyclic shifts; and
transmitting, by the mobile terminal, one of the generated first plurality of sequence to the network for the random access, and
if the high-speed related parameter represents FALSE,
generating, by the mobile terminal, a second plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones using the unrestricted set of cyclic shifts; and
transmitting, by the mobile terminal, one of the generated second plurality of sequences to the network for the random access.

### Claim 2 (depends on 1)

The method of claim 1, wherein the high-speed related parameter comprises one bit.

### Claim 3

A method of establishing a communication link between a mobile terminal and a network, the method comprising:
transmitting, by the network, a high-speed related parameter to the mobile terminal, the high-speed related parameter representing either ‘TRUE’ or ‘FALSE’, wherein TRUE corresponds to a restricted set of cyclic shifts and FALSE corresponds to an unrestricted set of cyclic shifts; and
if the high-speed related parameter represents TRUE,
receiving, by the network from the mobile terminal, one of a first plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones that are generated using the restricted set of cyclic shifts, and
if the high-speed related parameter represents FALSE,
receiving, by the network from the mobile terminal, one of a second plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones that are generated using the unrestricted set of cyclic shifts.

### Claim 4 (depends on 3)

The method of claim 3, wherein the high-speed related parameter comprises one bit.

### Claim 5

A mobile terminal for establishing a communication link with a network, the mobile terminal comprising:
a transmitting/receiving unit configured to transmit and receive messages between the mobile terminal and the network;
a display unit configured to display user interface information;
an input unit configured to receive inputs from a user; and
a processing unit configured to:
receive a high-speed related parameter from the network, the high-speed related parameter representing either ‘TRUE’ or ‘FALSE’, wherein TRUE corresponds to a restricted set of cyclic shifts and FALSE corresponds to an unrestricted set of cyclic shifts;
if the high-speed related parameter represents TRUE,
generate a first plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones using the restricted set of cyclic shifts; and
transmit one of the generated first plurality of sequences to the network for the random access, and
if the high-speed related parameter represents FALSE,
generate a second plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones using the unrestricted set of cyclic shifts; and
transmit one of the generated second plurality of sequences to the network for the random access.

### Claim 6 (depends on 5)

The mobile terminal of claim 5, wherein the high-speed related parameter comprises one bit.

### Claim 7

A network for establishing a communication link with a mobile terminal, the network comprising:
a transmitter configured to transmit messages to the mobile terminal;
a receiver configured to receive messages from the mobile terminal; and
a controller configured to:
transmit, to the mobile terminal, a high-speed related parameter representing either ‘TRUE’ or ‘FALSE’, wherein TRUE corresponds to a restricted set of cyclic shifts and FALSE corresponds to an unrestricted set of cyclic shifts; and
if the high-speed related parameter represents TRUE,
receive, from the mobile terminal, one of a first plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones that are generated using the restricted set of cyclic shifts, and
if the high-speed related parameter represents FALSE,
receive, from the mobile terminal, one of a second plurality of sequences for random access from Zadoff-Chu (ZC) sequences with zero correlation zones that are generated using the unrestricted set of cyclic shifts.

### Claim 8 (depends on 7)

The network of claim 7, wherein the high-speed related parameter comprises one bit.