# US 8,787,843 B2 · Wake up procedure for a base station in a communications network

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- Number: US 8,787,843 B2
- Document ID: US8787843B2
- Status: Granted
- Kind: B2
- Application number: 13/380,618
- Filed: 2009-06-26
- Published: 2012-07-12
- Granted: 2014-07-22
- Earliest claimed: 2009-06-26
- Assignees: Nokia Siemens Networks Oy
- Applicants: Martin Döttling; Jürgen Michel
- Inventors: Martin Döttling; Jürgen Michel
- Web page: https://patentgrep.com/patent/US8787843B2

## CPC

- H04W 52/0235: {where the received signal is a power saving command}
- H04W 52/0206: {in access points, e.g. base stations}
- H04W 88/08: Access point devices
- 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)
- 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

A mobile apparatus transmits a message for waking up an apparatus of a communications network in order to achieve access to the communications network. An apparatus of the communications network receives the message, determines whether the apparatus is in a standby mode in which the transmitter is deactivated, and shifts to a wake up mode, in which the transmitter is kept deactivated, for at most an apparatus-specific offset time in response to receipt of the message in case the apparatus is in the standby mode. The apparatus detects whether an acknowledgment message acknowledging that a successful access to the communications network has been achieved based on the message is received in the wake up mode of the apparatus, and the apparatus shifts to an active mode in which the transmitter is activated and provides access to the communications network for the mobile apparatus based on the message using the transmitter in case no acknowledgment message has been received in the wake up mode when the apparatus-specific offset time elapses. Otherwise, the apparatus shifts to the standby mode when the acknowledgement message is received in the wake up mode. The acknowledgment message may be received from the mobile apparatus or from an apparatus of the communications network.

## Claims

### Claim 1

An apparatus comprising:
at least one processor;
memory storing a program of instructions;
wherein the memory storing the program of instructions is configured to, with the at least one processor, cause the apparatus to at least;
cause a transmitter of a mobile communication device to transmit an access request message for waking up an apparatus of a communications network in order to achieve access to the communications network, determine successful access to the communications network based on the message, and
cause the transmitter to transmit an acknowledgment message for acknowledging the successful access, wherein the acknowledgement message is linked to the access request message such that the access request message can be identified based on the acknowledgement message.

### Claim 2 (depends on 1)

The mobile apparatus of claim 1, wherein the processor is configured to cause the transmitter to transmit the access request message using a power setting resulting from a relatively aggressive power setting procedure.

### Claim 3

An apparatus of a communications network, the apparatus comprising:
a transmitter;
a receiver configured to receive, from a mobile apparatus, a message for waking up the apparatus in order to achieve access to the communications network; and
a processor configured to
determine whether the apparatus is in a standby mode in which the transmitter is deactivated, shift the apparatus to a wake up mode, in which the transmitter is kept deactivated, for at most an apparatus-specific offset time in response to receipt of the message in case the apparatus is in the standby mode,
detect whether an acknowledgment message acknowledging that a successful access to the communications network has been achieved based on the message is received in the wake up mode of the apparatus,
shift the apparatus to an active mode in which the transmitter is activated and provide access to the communications network for the mobile apparatus based on the message using the transmitter in, case no acknowledgment message has been received in the wake up mode when the apparatus-specific offset time elapses, and shift the apparatus to the standby mode when the acknowledgement message is received in the wake up mode of the apparatus.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein the receiver is configured to receive the acknowledgement message from the mobile apparatus.

### Claim 5 (depends on 3)

The apparatus of claim 3 wherein the processor is configured to determine that the acknowledgment message acknowledges the successful access to the communications network based on the message, using preamble sequences of the message and the acknowledgment message.

### Claim 6 (depends on 3)

The apparatus of claim 3, comprising an interface configured to receive the acknowledgement message from an apparatus of the communications network.

### Claim 7 (depends on 3)

The apparatus of claim 3, comprising an interface, wherein the processor is configured to cause the interface to send the acknowledgment message acknowledging that the successful access to the communications network has been achieved based on the message to apparatuses of the communications network in case the apparatus has provided access to the communications network for the mobile apparatus based on the message.

### Claim 8 (depends on 3)

The apparatus of claim 3, wherein the apparatus-specific offset time fulfills the following expression:
tmin<Δt<tmax
where Δt is the apparatus-specific offset time, tmin is a minimum offset time and tmax is a maximum offset time, wherein the apparatus comprises an interface configured to receive the minimum offset time and the maximum offset time from the communications network.

### Claim 9 (depends on 3)

The apparatus of claim 3, wherein the processor is configured to derive the apparatus-specific offset time from a cell identity of the apparatus and/or determine the apparatus-specific offset time based on a time of deactivation of the transmitter.

### Claim 10 (depends on 3)

The apparatus of claim 3, comprising an interface, wherein when the processor determines that the apparatus is in the active mode when the message is received, the processor is configured to provide access to the communications network for the mobile apparatus based on the message and cause the interface to send the acknowledgment message acknowledging that the successful access to the communications network has been achieved based on the message to apparatuses of the communications network in case the apparatus has provided access to the communications network for the mobile apparatus based on the message.

### Claim 11

A method comprising:
transmitting an access request message for waking up an apparatus of a communications network in order to achieve access to the communications network;
determining successful access to the communications network based on the access request message; and
transmitting an acknowledgment message for acknowledging the successful access, wherein the acknowledgement message is linked to the access request message such that the access request message can be identified based on the acknowledgement message.

### Claim 12 (depends on 11)

The method of claim 11, wherein the acknowledgement message is linked to the message such that the message can be identified based on the acknowledgment message.

### Claim 13 (depends on 11)

The method of claim 11, wherein the message includes a first preamble sequence out of a plurality of first preamble sequences, the acknowledgment message includes a second preamble sequence out of a plurality of second preamble sequences, and the second preamble sequence is linked to the first preamble sequence such that the first preamble sequence can be identified based on the second preamble sequence.

### Claim 14 (depends on 11)

The method of claim 11, comprising: transmitting the message using a power setting resulting from a relatively aggressive power setting procedure.

### Claim 15

A method for an apparatus of a communications network, the method comprising:
receiving, from a mobile apparatus, a message for waking up the apparatus in order to achieve access to the communications network;
determining whether the apparatus is in a standby mode in which a transmitter is deactivated;
shifting the apparatus to a wake up mode, in which the transmitter is kept deactivated, for at most an apparatus-specific offset time in response to receipt of the message in case the apparatus is in the standby mode;
detecting whether an acknowledgment message acknowledging that a successful access to the communications network has been achieved based on the message is received in the wake up mode of the apparatus;
shifting the apparatus to an active mode in which the transmitter is activated and providing access to the communications network for the mobile apparatus based on the message using the transmitter in case no acknowledgment message has been received in the wake up mode when the apparatus-specific offset time elapses; and
shifting the apparatus to the standby mode when the acknowledgement message is received in the wake up mode of the apparatus.

### Claim 16 (depends on 15)

The method of claim 15, comprising: receiving the acknowledgement message from the mobile apparatus.

### Claim 17 (depends on 15)

The method of claim 15, comprising:
determining that the acknowledgment message acknowledges the successful access to the communications network based on the message, using preamble sequences of the message and the acknowledgment message.

### Claim 18 (depends on 15)

The method of claim 15, comprising: receiving the acknowledgement message from an apparatus of the communications network.

### Claim 19 (depends on 18)

The method of claim 18, wherein the acknowledgment message includes an identity of the mobile apparatus and/or a timestamp and a cell identity of a location from where the message is transmitted and/or a preamble sequence included in the message and a cell identity of the apparatus transmitting the acknowledgment message.

### Claim 20 (depends on 15)

The method of claim 15, comprising:
sending the acknowledgment message acknowledging that the successful access to the communications network has been achieved based on the message to apparatuses of the communications network in case the apparatus has provided access to the communications network for the mobile apparatus based on the message.

### Claim 21 (depends on 15)

The method of claim 15, wherein the apparatus-specific offset time fulfills the following expression:
tmin<Δt<tmax,
where Δt is the apparatus-specific offset time, tmin is a minimum offset time and tmax is a maximum offset time, wherein the method comprises receiving the minimum offset time and the maximum offset time from the communications network.

### Claim 22 (depends on 21)

The method of claim 21, comprising:
deriving the apparatus-specific offset time from a cell identity of the apparatus and/or determining the apparatus-specific offset time based on a time of deactivation of the transmitter.

### Claim 23 (depends on 15)

The method of claim 15, comprising:
when it is determined that the apparatus is in the active mode when the message is received, providing access to the communications network for the mobile apparatus based on the message and sending the acknowledgment message acknowledging that the successful access to the communications network has been achieved based on the message to apparatuses of the communications network in case the apparatus has provided access to the communications network for the mobile apparatus based on the message.

### Claim 24 (depends on 11)

A non-transitory computer program product including a program for a processing device, comprising software code portions for performing the steps of claim 11 when the program is run on the processing device.

### Claim 25 (depends on 24)

The computer program product according to claim 24, wherein the computer program product comprises a computer-readable medium on which the software code portions are stored.

### Claim 26 (depends on 24)

The computer program product according to claim 24, wherein the program is directly loadable into an internal memory of the processing device.