Method and apparatus for performing neighbor discovery

Patent metadata

Field	Value
Publication number	US-9510177-B2
Application number	US-201214125302-A
Country	US
Kind code	B2
Filing date	Jun 8, 2012
Priority date	Jun 10, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A method and apparatus for neighbor discovery in a wireless communication system are disclosed. A neighbor seeking wireless transmit/receive unit (WTRU) may send a first beacon based on configuration information provided by the network. The neighbor WTRUs receive the first beacon and may send either a report to the network or send a second beacon to the neighbor seeking WTRU. The network may then provide neighbor WTRU information to the neighbor seeking WTRU. The neighbor discovery may be performed within a pre-defined group of WTRUs that is formed based on proximity to the WTRU and/or an attribute of the WTRU. The neighbor discovery procedure may be performed to find neighbor WTRUs in case where a WTRU fails to find any network. A neighbor list may be generated by the neighbor seeking WTRU by measuring reference signals transmitted by neighbor WTRUs on an uplink to the network.

First claim

The invention claimed is:

1. A method for neighbor discovery, implemented in a wireless transmit/receive unit (WTRU), the method comprising:
transmitting, by the WTRU, a neighbor discovery request to a cellular wireless network to discover neighbor WTRUs for peer-to-peer communication in the cellular wireless network while the WTRU is associated with a base station of the cellular wireless network;
receiving, by the WTRU, a neighbor discovery configuration information from the cellular wireless network in response to the neighbor discovery request;
receiving, by the WTRU, a beacon from at least one neighbor WTRU;
generating, by the WTRU, a neighbor discovery report based on the received beacon, wherein the report contains at least one WTRU identity and a counter value; and
transmitting, by the WTRU, the neighbor discovery report to the cellular wireless network.

2. The method of claim 1 , wherein the counter value is a system frame number (SFN).

3. A method for neighbor discovery, implemented in a wireless transmit/receive unit (WTRU), the method comprising:
searching, by the WTRU, for a first beacon to discover neighbor WTRUs for peer-to-peer communication on a condition that the WTRU fails to connect to a cellular wireless network;
receiving, by the WTRU, the first beacon;
synchronizing, by the WTRU, timing and frequency based on the received first beacon; and
sending, by the WTRU, a second beacon carrying information identifying the WTRU, wherein the second beacon is a beacon reserved for any WTRU that fails to connect to the cellular wireless network.

4. The method of claim 3 wherein the first beacon carries a fixed pattern sequence that are used by WTRUs in a cell.

5. A wireless transmit/receive unit (WTRU) for neighbor discovery, the WTRU comprising:
a processor operatively coupled to a transceiver, the processor and the transceiver configured to transmit a neighbor discovery request to a cellular wireless network to discover neighbor WTRUs for peer-to-peer communication the in cellular wireless network while the WTRU is associated with a base station of the cellular wireless network;
the processor and the transceiver configured to receive neighbor discovery configuration information from the cellular wireless network in response to the neighbor discovery request;
the processor and the transceiver configured to receive a beacon from at least one neighbor WTRU;
the transceiver configured to generate a neighbor discovery report based on the received beacon, wherein the report contains the at least one WTRU identity and a counter value; and
the processor and the transceiver configured to transmit the neighbor discovery report to the cellular wireless network.

6. The WTRU of claim 5 , wherein the counter value is a system frame number (SFN).

Assignees

• Deng Tao
• Pragada Ravikumar V
• Sternberg Gregory S
• Raghothaman Balaji
• Deng Zhuorong
• Vanganuru Kiran K
• Interdigital Patent Holdings Inc

Inventors

• Deng Tao
• Pragada Ravikumar V
• Sternberg Gregory S
• Raghothaman Balaji
• Deng Zhuorong
• Vanganuru Kiran K

Classifications

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W48/14

  using user query {or user detection} · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W48/20

  Selecting an access point · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title