# US 9,439,225 B2 · Rapid network acquisition and overhead message storage for machine-to-machine devices

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- Number: US 9,439,225 B2
- Document ID: US9439225B2
- Status: Granted
- Kind: B2
- Application number: 13/593,130
- Filed: 2012-08-23
- Published: 2014-02-27
- Granted: 2016-09-06
- Earliest claimed: 2012-08-23
- Assignees: QUALCOMM Incorporated
- Applicants: Anand Rajurkar; Bhaskara V. Batchu; Aditya Bohra
- Inventors: Anand Rajurkar; Bhaskara V. Batchu; Aditya Bohra
- Web page: https://patentgrep.com/patent/US9439225B2

## CPC

- H04W 76/10: Connection setup
- H04W 48/20: Selecting an access point
- H04W 48/16: Discovering, processing access restriction or access information
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A stationary access terminal, such as a stationary remote sensor, capable of wireless communication with a network is provided. The access terminal obtains sector information associated with a wireless network node by establishing a communication link with the network node. The access terminal then stores the sector information in non-volatile memory, and later retrieves the sector information from the memory, for example, after a subsequent boot up or wake up event. The stored sector information is used by the access terminal to establish a subsequent communication link with the network node, and may include at least one of channel, band, and pseudo-random number sequence information. The access terminal may also store overhead messages received from the network node in the non-volatile memory. The stored overhead messages may later be retrieved to establish system operating parameters of the network node after the subsequent boot up or wake up event.

## Claims

### Claim 1

A method for wireless communication operable at a stationary access terminal, the method comprising:
obtaining sector information associated with a wireless network node by establishing a communication link with the wireless network node;
receiving an overhead message containing overhead information different than the sector information during a first system idle state from the wireless network node via the communication link;
storing the overhead information received in the overhead message and the sector information in a memory circuit associated with the stationary access terminal;
transitioning from the first system idle state to a power off state and from the power off state to a second system idle state after powering on and undergoing a boot up event, wherein the storing of the overhead information and the sector information in the memory circuit continues through the transitioning;
retrieving the sector information from the memory circuit after undergoing the boot up event;
establishing a subsequent communication link with the wireless network node utilizing the sector information retrieved from the memory circuit;
retrieving the overhead information from the memory circuit after establishing the subsequent communication link with the wireless network node and in the second system idle state; and
attempting to establish system operating parameters associated with the wireless network node using the overhead information retrieved from the memory circuit.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
searching a plurality of combinations of band, channel, and PN sequence according to a preferred roaming list to establish the communication link with the wireless network node.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
terminating the communication link with the wireless network node prior to establishing an additional communication link with the wireless network node.

### Claim 4 (depends on 1)

The method of claim 1, wherein transitioning from the first system idle state to a power off state and from the power off state to a second system idle state after powering on and undergoing a boot up event further includes:
transitioning from the first system idle state to a non-idle state, from the non-idle state to the power off state and from the power off state to the second system idle state after powering on and undergoing a boot up event, wherein the system non-idle state is either a system initialization state, a system access state, or a system traffic channel state.

### Claim 5 (depends on 1)

The method of claim 1, wherein the overhead information includes a stored configuration sequence number that is stored in the memory circuit and attempting to establish system operating parameters further includes:
determining that a received configuration sequence number received from the wireless network node does not match the stored configuration sequence number; and
receiving additional overhead messages from the wireless network node via a subsequent communication link to establish system operating parameters associated with the wireless network node.

### Claim 6 (depends on 1)

The method of claim 1, wherein the overhead information includes a stored configuration sequence number that is stored in the memory circuit and attempting to establish system operating parameters further includes:
determining that a received configuration sequence number received from the wireless network node matches the stored configuration sequence number; and
retrieving one or more stored overhead messages from the memory circuit to establish system operating parameters associated with the wireless network node.

### Claim 7 (depends on 6)

The method of claim 6, wherein the stored overhead messages indicate at least one of a slot cycle index value, an initial transmit power for the stationary access terminal, and/or a search window size for pilot channel detection.

### Claim 8 (depends on 6)

The method of claim 6, wherein the received configuration sequence number is equal to the stored configuration sequence number.

### Claim 9 (depends on 1)

The method of claim 1, wherein the wireless network node is a base station and the stationary access terminal is a stationary sensor device.

### Claim 10 (depends on 1)

The method of claim 1, wherein obtaining the sector information further includes:
obtaining the sector information after an initial boot up event of the stationary access terminal, wherein the sector information comprises channel information, band information, and pseudo random number (PN) sequence information.

### Claim 11 (depends on 10)

The method of claim 10, wherein establishing the subsequent communication link with the wireless network node further includes:
establishing the subsequent communication link utilizing the sector information after the boot up event of the stationary access terminal, the initial boot up event occurring before the boot up event.

### Claim 12 (depends on 1)

The method of claim 1, wherein storing the overhead information further comprising:
receiving a first configuration sequence number associated with the overhead message from the wireless network node via the communication link; and
storing the first configuration sequence number as the overhead information in the memory circuit of the stationary access terminal.

### Claim 13 (depends on 12)

The method of claim 12, wherein attempting to establish system operating parameters further includes:
receiving a second configuration sequence number from the wireless network node via a subsequent communication link;
comparing the stored first configuration sequence number with the received second configuration sequence number;
determining that the stored first configuration sequence number matches the received second configuration sequence number; and
retrieving one or more stored overhead messages from the memory circuit to establish system operating parameters associated with the wireless network node.

### Claim 14 (depends on 13)

The method of claim 13, further comprising:
receiving a second overhead message along with the second configuration sequence number, the second configuration sequence number associated with the second overhead message.

### Claim 15 (depends on 13)

The method of claim 13, wherein receiving the overhead message and the first configuration sequence number from the wireless network node via the communication link occurs after an initial boot up event.

### Claim 16 (depends on 15)

The method of claim 15, wherein retrieving the one or more stored overhead messages stored in the memory circuit of the stationary access terminal occurs after the boot up event or a wake up event, the initial boot up event occurring before the boot up event or the wake up event.

### Claim 17

A stationary access terminal comprising:
a communication interface adapted to establish communications with a wireless network node; and
a processing circuit communicatively coupled to the communication interface, the processing circuit adapted to
obtain sector information associated with the wireless network node by establishing a communication link with the wireless network node;
receive an overhead message containing overhead information different than the sector information during a first system idle state from the wireless network node via the communication link;
store the overhead information received in the overhead message and the sector information in a memory circuit associated with the stationary access terminal;
transition from the first system idle state to a power off state and from the power off state to a second system idle state after powering on and undergoing a boot up event, wherein a storing of the overhead information and the sector information in the memory circuit continues through the transition;
retrieve the sector information from the memory circuit after undergoing the boot up event;
establish a subsequent communication link with the wireless network node utilizing the sector information retrieved from the memory circuit;
retrieving the overhead information from the memory circuit after establishing the subsequent communication link with the wireless network node and in the second system idle state; and
attempting to establish system operating parameters associated with the wireless network node using the overhead information retrieved from the memory circuit.

### Claim 18 (depends on 17)

The stationary access terminal of claim 17, wherein the processing circuit is further adapted to: search a plurality of band, channel, and PN sequence combinations according to a preferred roaming list to establish the communication link with the wireless network node.

### Claim 19 (depends on 17)

The stationary access terminal of claim 17, wherein the processing circuit is further adapted to:
receive a first configuration sequence number associated with the overhead message from the wireless network node via the communication link; and
store the first configuration sequence number as the overhead information in the memory circuit of the stationary access terminal.

### Claim 20 (depends on 19)

The stationary access terminal of claim 19, wherein the processing circuit is further adapted to:
receive a second configuration sequence number from the wireless network node via a subsequent communication link;
compare the stored first configuration sequence number with the received second configuration sequence number;
determine that the stored first configuration sequence number matches the received second configuration sequence number; and
retrieve one or more stored overhead message from the memory circuit to establish system operating parameters associated with the wireless network node.

### Claim 21 (depends on 20)

The stationary access terminal of claim 20, wherein the processing circuit is further adapted to:
receive a second overhead message along with the second configuration sequence number, the second configuration sequence number associated with the second overhead message.

### Claim 22 (depends on 17)

The stationary access terminal of claim 17, wherein the processing circuit is further adapted to:
transition from the first system idle state to a non-idle state, from the non-idle state to the power off state and from the power off state to the second system idle state after powering on and undergoing a boot up event, wherein the system non-idle state is either a system initialization state, a system access state, or a system traffic channel state.

### Claim 23 (depends on 20)

The stationary access terminal of claim 20, wherein the one or more stored overhead messages indicate at least one of a slot cycle index value, an initial transmit power for the stationary access terminal, and/or a search window size for pilot channel detection.

### Claim 24 (depends on 20)

The stationary access terminal of claim 20, wherein the processing circuit is adapted to receive the overhead message and the first configuration sequence number from the wireless network node via the communication link after an initial boot up event.

### Claim 25 (depends on 24)

The stationary access terminal of claim 24, wherein the processing circuit is adapted to retrieve the one or more stored overhead messages stored in the memory circuit of the stationary access terminal after the boot up event or a wake up event, the initial boot up event occurring before the boot up event or the wake up event.

### Claim 26

A stationary access terminal comprising:
means for obtaining sector information associated with a wireless network node by establishing a communication link with the wireless network node;
means for receiving an overhead message containing overhead information different than the sector information during a first system idle state from the wireless network node via the communication link;
means for storing the overhead information received in the overhead message and the sector information in a memory circuit associated with the stationary access terminal;
means for transitioning from the first system idle state to a power off state and from the power off state to a second system idle state after powering on and undergoing a boot up event, wherein a storing of the overhead information and the sector information in the memory circuit continues through a transitioning from the first system idle state to the power off state and from the power off state to the second system idle state;
means for retrieving the sector information from the memory circuit after undergoing the boot up event;
means for establishing a subsequent communication link with the wireless network node utilizing the sector information retrieved from the memory circuit;
means for retrieving the overhead information from the memory circuit after establishing the subsequent communication link and in the second system idle state; and
means for attempting to establish system operating parameters associated with the wireless network node using the overhead information retrieved from the memory circuit.

### Claim 27 (depends on 26)

The stationary access terminal of claim 26, further comprising:
means for receiving a first configuration sequence number associated with the overhead message from the wireless network node via the communication link;
means for storing the first configuration sequence number as the overhead information in the memory circuit of the stationary access terminal;
means for receiving a second configuration sequence number from the wireless network node via a subsequent communication link;
means for comparing the stored first configuration sequence number with the received second configuration sequence number;
means for determining that the stored first configuration sequence number ⊖ matches the received second configuration sequence number; and
means for retrieving one or more stored overhead messages from the memory circuit to establish system operating parameters associated with the wireless network node.

### Claim 28 (depends on 27)

The stationary access terminal of claim 27, wherein receiving the overhead message and the first configuration sequence number from the wireless network node via the communication link occurs after an initial boot up event.

### Claim 29 (depends on 28)

The stationary access terminal of claim 28, wherein retrieving the one or more overhead messages stored in the memory circuit of the stationary access terminal occurs after the boot up event or a wake up event, the initial boot up event occurring before the boot up event or the wake up event.

### Claim 30 (depends on 26)

The stationary access terminal of claim 26, wherein the system non-idle state is either a system initialization state, a system access state, or a system traffic channel state.

### Claim 31

A non-transitory computer-readable medium having instructions stored thereon for wireless communication, the instructions which when executed by at least one processor cause the processor to:
obtain sector information associated with the wireless network node by establishing a communication link with the wireless network node;
receive an overhead message containing overhead information different than the sector information during a first system idle state from the wireless network node via the communication link;
store the overhead information received in the overhead message and the sector information in a memory circuit associated with a stationary access terminal;
transition from the first system idle state to a power off state and from the power off state to a second system idle state after powering on and undergoing a boot up event, wherein a storing of the overhead information and the sector information in the memory circuit continues through the transition;
retrieve the sector information from the memory circuit after undergoing the boot up event;
establish a subsequent communication link with the wireless network node utilizing the sector information retrieved from the memory circuit;
retrieve the overhead information from the memory circuit after establishing the subsequent communication link and in the second system idle state; and
attempt to establish system operating parameters associated with the wireless network node using the overhead information retrieved from the memory circuit.

### Claim 32 (depends on 31)

The non-transitory computer-readable medium of claim 31, wherein the instructions which when executed by the processor further cause the processor to:
receive a first configuration sequence number associated with the overhead message from the wireless network node via the communication link;
store the first configuration sequence number as the overhead information in the memory circuit of the stationary access terminal;
receive a second configuration sequence number from the wireless network node via a subsequent communication link;
compare the stored first configuration sequence number with the received second configuration sequence number;
determine that the stored first configuration sequence number matches the received second configuration sequence number; and
retrieve one or more stored overhead messages from the memory circuit to establish system operating parameters associated with the wireless network node.

### Claim 33 (depends on 32)

The non-transitory computer-readable medium of claim 32, wherein causing the processor to receive the overhead message and the first configuration sequence number from the wireless network node via the communication link occurs after an initial boot up event.

### Claim 34 (depends on 33)

The non-transitory computer-readable medium of claim 33, wherein causing the processor to retrieve the one or more stored overhead messages stored in the memory circuit of the stationary access terminal occurs after the boot up event or a wake up event, the initial boot up event occurring before the boot up event or the wake up event.

### Claim 35 (depends on 31)

The non-transitory computer-readable medium of claim 31, wherein the system non-idle state is either a system initialization state, a system access state, or a system traffic channel state.