# US 2021/0243060 A1 · Pre-allocated random access identifiers

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- Number: US 2021/0243060 A1
- Document ID: US20210243060A1
- Status: Published application
- Kind: A1
- Application number: 17/235,384
- Filed: 2021-04-20
- Published: 2021-08-05
- Earliest claimed: 2006-09-01
- Assignees: Wi-LAN, Inc.
- Applicants: Wi-LAN INC.
- Inventors: Yair Bourlas; Adam E. Newham; Lei Wang; Srikanth Gummadi
- Web page: https://patentgrep.com/patent/US20210243060A1

## CPC

- H04L 27/2601: {Multicarrier modulation systems}
- H04B 7/2668: {Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation, (for code acquisition H04B1/7075, for code tracking H04B1/7085)}
- H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions}
- H04W 36/08: Reselecting an access point
- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/51: based on terminal or device properties
- H04W 74/004: {in the uplink, i.e. towards network}
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/085: {collision avoidance}
- H04W 74/0875: {with assigned priorities based access}
- H04W 74/0891: {for synchronized access}
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- 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)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more identifiers to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.

## Claims

### Claim 1

A method of operating a feedback processor in an orthogonal frequency division OFDM system, comprising:
monitoring timing of a received signal from a subscriber station;
determining the timing of the received signal from the subscriber station relative to an allocated time; and
generating a feedback control signal to instruct the subscriber station to advance or delay a transmission time, in order to better align a subscriber station timing with a system timing.

### Claim 2

A base station comprising:
a receiver operable to receive a signal from a subscriber station;
a baseband orthogonal frequency division multiplex (OFDM) processor operable to:
monitor timing of the received signal from the subscriber station;
determine the timing of the received signal from the subscriber station relative to an allocated time; and
generate a feedback control signal to instruct the particular subscriber station to advance or delay a transmission time, in order to better align a subscriber station timing with a system timing; and
a transmitter operable to transmit the feedback control signal to the subscriber station.