Methods and apparatus for synchronization in a wireless network

• US 6,621,813 B2
• Filed: 04/18/2001
• Issued: 09/16/2003
• Est. Priority Date: 11/14/1996
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Lindsay, Charles L., Jensen, Ryan N., Petch, Bryan K.
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US09/838,006
• Publication Number:
  US 20020001299A1
• Time in Patent Office: 881 Days
• Field of Search: 370/310, 370/315, 370/316, 370/320, 370/321, 370/324, 370/350, 370/503, 370/516, 370/520, 370/522, 375/343, 375/356, 375/357, 375/367, 375/371, 375/137, 375/145, 375/149, 455/422, 455/502
• US Class Current: 370/350
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04L 7/033 using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
• CPC Class Codes: H04L 7/0331 with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock H04L7/0337 takes precedence
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

Abstract

A method of synchronizing a base station and a remote station is presented. The base station is communicatively coupled with the remote station and a reference network. The base station clock signal is compared with a reference clock signal derived from the reference network and adjusted accordingly. The adjusted base station clock signal is then used to generate timing information in the form of a preamble, which is periodically transmitted from the base station over a wireless communication network to the remote station where a clock signal is generated. The remote station compares the clock signal with the timing information and adjusts the clock signal accordingly. This is done without reference to an external clock.

Claims

1. A method comprising:

comparing a base station clock signal with a reference clock signal derived from a reference network;

adjusting the base station clock signal based on the reference clock signal;

generating timing information using the base station clock signal adjusted to the reference clock signal, the timing information generated in the form of a periodically transmitted preamble at a base station;

transmuting the timing information over a wireless communication network from the base station to a remote station;

generating a clock signal at the remote station;

comparing the timing information and the clock signal at the remote station; and

adjusting the clock signal without reference to an external clock, based on said comparing of the timing information and the clock signal.

2. A method comprising:

generating a first preamble and a second preamble at a base station;

transmitting the first preamble from the base station;

generating a clock signal on a remote station;

receiving the first preamble at the remote station;

generating a clock control signal at the remote station after receiving the first preamble and prior to receiving the second preamble, the clock control signal generated based on the clock signal and the remote station receiving the first preamble; and

adjusting the clock signal based on the clock control signal, and without reference to an external clock.