Mobility in a Distributed Antenna System

Patent metadata

Field	Value
Publication number	US-2016374116-A1
Application number	US-201615254736-A
Country	US
Kind code	A1
Filing date	Sep 1, 2016
Priority date	Dec 12, 2008
Publication date	Dec 22, 2016
Grant date	—

Abstract

A device, method or system implements operations to receive compressed samples of wireless transmissions from a plurality of user equipment (UEs) traveling through different communication regions in a wireless network, and detect information in the wireless transmissions of the UEs based on the compressed samples.

First claim

What is claimed is:

1 . A user equipment, comprising:
a processor configured to detect a transition of the user equipment from a first pilot zone to a second pilot zone in a wireless network having a plurality of pilot zones, wherein each pilot zone has an assigned set of pilot signals; a receiver coupled to the processor and configured to receive a broadcast message comprising information identifying a current pilot zone, wherein the processor is configured to select a pilot signal from the assigned set of pilot signals for use in the second pilot zone based on at least one scheduled assignment; and a transmitter coupled to the processor and configured to transmit a wireless transmission including the pilot signal.

2 . The user equipment of claim 1 , wherein the transmitter is configured to transmit the wireless transmission including the pilot signal based on an S-sparse set of vectors.

3 . The user equipment of claim 1 , wherein the at least one scheduled assignment is based on a system clock.

4 . The user equipment of claim 1 , wherein the processor is configured to detect the transition of the user equipment from the first pilot zone to the second pilot zone based on an overhead message.

5 . The user equipment of claim 4 , wherein the overhead message is sent from a base station, and wherein the overhead message comprises at least one of a length of message frames, the value of M associated with the number of sensing waveforms (“φ j ”), or a sparseness S of uplink signals (“f”) being sent.

6 . The user equipment of claim 1 , wherein at least two pilot zones are assigned the same set of pilot signals.

7 . The user equipment of claim 1 , wherein the set of pilot signals includes a plurality of orthogonal waveforms.

8 . The user equipment of claim 1 , wherein the set of pilot signals includes a plurality of pseudo random waveforms.

9 . A method implemented by a user equipment comprising:
traveling from a first pilot zone to a second pilot zone in a wireless network having a plurality of pilot zones, each pilot zone having an assigned set of pilot signals; receiving a broadcast message comprising information identifying a current pilot zone; selecting a pilot signal from the assigned set of pilot signals for use in the second pilot zone based on at least one scheduled assignment; and implementing a wireless transmission including the pilot signal.

10 . The method of claim 9 , further comprising detecting a transition between the first pilot zone to the second pilot zone based on a received overhead message.

11 . The method of claim 9 , wherein the at least one scheduled assignment is based on a system clock.

12 . The method of claim 9 , wherein implementing the wireless transmission including the pilot signal is based on an S-sparse set of vectors.

13 . The method of claim 9 , wherein the traveling from the first pilot zone to the second pilot

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zone occurs at a speed such that a word period is less than approximately of a coherence interval being at least, 10*T word ≈T coh .

14 . The method of claim 9 , wherein at least two pilot zones are assigned the same set of pilot signals.

15 . The method of claim 9 , wherein the set of pilot signals includes at least one of plurality of orthogonal waveforms or a plurality of pseudo random waveforms.

16 . A user equipment, comprising:
a processor configured to recognize when the user equipment exits a first pilot zone and enters a second pilot zone in a wireless network having a plurality of pilot zones, each pilot zone having an assigned set of pilot signals; a receiver configured to receive a broadcast message comprising information identifying a current pilot zone, wherein the processor is configured to select a new pilot signal from the assigned set of pilot signals for conducting communications in the second pilot zone based on at least one scheduled assignment; and a transmitter coupled to the processor and configured to implement wireless transmissions including the new pilot signal.

17 . The user equipment of claim 16 , wherein the transmitter is configured to implement the wireless transmissions including the new pilot signal based on an S-sparse set of vectors.

18 . The user equipment of claim 16 , wherein, when the user equipment exits the first pilot zone and enters the second pilot zone, the user equipment travels at a speed such that a word period is less than approximately

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of a coherence interval being at least, 10*T word ≈T coh .

19 . The user equipment of claim 16 , wherein the processor configured to recognize when the user equipment exits the first pilot zone and enters the second pilot zone in response to receiving an overhead message.

20 . The user equipment of claim 19 , wherein the overhead message is sent from a base station, and wherein the overhead message comprises at least one of a length of message frames, the value of M associated with the number of sensing waveforms (“φ j ”), or a sparseness S of uplink signals (“f”) being sent.

Assignees

• Blackberry Ltd

Inventors

• Sexton Thomas Aloysuis
• Cliff Charles Arthur
• Pecen Mark E
• Lusina Paul James

Classifications

• H03M7/30 Primary

  Compression (speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title