Access node, control node, and various methods for adapting a reporting period for a user equipment

Patent metadata

Field	Value
Publication number	US-2016277256-A1
Application number	US-201514660399-A
Country	US
Kind code	A1
Filing date	Mar 17, 2015
Priority date	Mar 17, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

An access node (e.g., Node B), a control node (e.g., RNC) and various methods are described herein for adapting a reporting period for a user equipment, wherein the reporting period indicates how often the user equipment is to send a feedback message containing a channel quality indicator (CQI) to the access node (e.g., Node B).

First claim

1 . An access node configured to adapt a reporting period for a user equipment, wherein the user equipment is configured for a primary carrier and a secondary carrier, and wherein the assess node interfaces with the user equipment and a control node, the access node comprising:
at least one processor; and, at least one memory that stores processor-executable instructions, wherein the at least one processor interfaces with the at least one memory to execute the processor-executable instructions, whereby the access node is operable to:
receive, from the user equipment, a first feedback message containing a first channel quality indicator (CQI) of the secondary carrier;
compute a Doppler frequency (F d2 ) of the secondary carrier using the first CQI of the secondary carrier;
compute a Doppler frequency (F d1 ) of the primary carrier using the computed Doppler frequency (F d2 ) of the secondary carrier;
select a second reporting period for the user equipment based on the computed Doppler frequency (F d1 ) of the primary carrier, wherein the selected second reporting period indicates how often the user equipment is to send a second feedback message containing a second CQI of the secondary carrier; and,
communicate the selected second reporting period for the user equipment to the control node.

2 . The access node of claim 1 , wherein the access node is operable to periodically repeat the receive operation, the two compute operations, the select operation, and the communicate operation.

3 . The access node of claim 1 , wherein the access node is operable to compute the Doppler frequency (F d2 ) of the secondary carrier per the following equation:
F d2 =K *ΔCQI/Δ t
where F d2 is the Doppler frequency of the secondary carrier, K is a constant, and ΔCQI/Δt is a rate of CQI change for the secondary carrier over a period of time Δt.

4 . The access node of claim 1 , wherein the access node is operable to de-activate the secondary carrier after computing the Doppler frequency (F d2 ) of the secondary carrier and then re-activate the secondary carrier after a predetermined amount of time.

5 . The access node of claim 1 , wherein the access node is operable to compute the Doppler frequency (F d1 ) of the primary carrier per the following equation:
F d1 F d2 *( F 1 /F 2 ) where F d1 is the Doppler frequency of the primary carrier, F d2 is the Doppler frequency of the secondary carrier, F 1 is a frequency of the primary carrier, and F 2 is a frequency of the secondary carrier.

6 . The access node of claim 1 , wherein the access node is operable to select the second reporting period for the user equipment as follows:
categorize the computed Doppler frequency (F d1 ) of the primary carrier into one of a plurality of Doppler frequency ranges; and, select the second reporting period for the user equipment based on the one of the plurality of Doppler frequency ranges.

7 . The access node of claim 5 , wherein the access node is operable to categorize the computed Doppler frequency (F d1 ) of the primary carrier into one of a plurality of Doppler frequency ranges as follows:
a low Doppler frequency range: F d1 <FL a medium Doppler frequency range: FL<=F d1 <FH a high Doppler frequency range: FH<=F d1
where FL is a low frequency threshold and FH is a high frequency threshold.

8 . A method in an access node for adapting a reporting period for a user equipment, wherein the user equipment is configured for a primary carrier and a secondary carrier, and wherein the access node interfaces with the user equipment and a control node, the method comprising:
receiving, from the user equipment, a first feedback message containing a first channel quality indicator (CQI) of the secondary carrier; computing a Doppler frequency (F d2 ) of the secondary carrier using the first CQI of the secondary carrier; computing a Doppler frequency (F d1 ) of the primary carrier using the computed Doppler frequency (F d2 ) of the secondary carrier; selecting a selected reporting period for the user equipment based on the computed Doppler frequency (F d1 ) of the primary carrier, wherein the selected reporting period indicates how often the user equipment is to send a second feedback message containing a second CQI of the secondary carrier; and, communicating the selected second reporting period for the user equipment to the control node.

9 . The method of claim 8 , further periodically repeating the receiving step, the two computing steps, the selecting step, and the communicating step.

10 . The method of claim 8 , wherein the computing of the Doppler frequency (F d2 ) of the secondary carrier is performed per following equation:
F d2 =K *ΔCQI/Δ t
where F d2 is the Doppler frequency of the secondary carrier, K is a constant, and ΔCQI/Δt is a rate of CQI change for the secondary carrier over a period of time Δt.

11 . The method of claim 8 , further comprising de-activating the secondary carrier after computing the Doppler frequency (F d2 ) of the secondary carrier and then re-activating the secondary carrier after a predetermined amount of time.

12 . The method of claim 8 , wherein the computing of the Doppler frequency (F d1 ) of the primary carrier is performed per following equation:
F d1 F d2 *( F 1 /F 2 ) where F d1 is the Doppler frequency of the primary carrier, F d2 is the Doppler frequency of the secondary carrier, F 1 is a frequency of the primary carrier, F 2 is a frequency of the secondary carrier.

13 . The method of claim 8 , wherein the selecting of the reporting period for the user equipment is performed as follows:
categorizing the computed Doppler frequency (F d1 ) of the primary carrier into one of a plurality of Doppler frequency ranges; and, selecting the reporting period for the user equipment based on the one of the plurality of Doppler frequency ranges.

14 . The method of claim 13 , wherein the categorizing of the computed Doppler frequency (F d1 ) of the primary carrier into one of a plurality of Doppler frequency ranges is performed as follows:
a low Doppler frequency range: F d1 <FL a medium Doppler frequency range: FL<=F d1 <FH a high Doppler frequency range: FH<=F d1
where FL is a low frequency threshold and FH is a high frequency threshold.

15 . A control node configured to adapt a reporting period for a user equipment, wherein the control node interfaces with the user equipment and an access node, the control node comprising:
at least one processor; and, at least one memory that stores processor-executable instructions, wherein the at least one processor interfaces with the at least one memory to execute the processor-executable instructions, whereby the control node is operable to: configure the user equipment for a primary carrier and a secondary carrier; configure the user equipment to have a first reporting period which indicates how often the user equipment is to send a first feedback message containing a first channel quality indicator (CQI) for the secondary carrier to the access node; receive, from the access node, a message indicating a second reporting period to be used by the user equipment; and, re-configure the user equipment to have the second reporting period which indicates how often the user equipment is to send a second feedback message containing a second CQI for the secondary carrier to the access node.

16 . A method in control node for adapting a reporting period for a user equipment, wherein the control node interfaces with the user equipment and a

Assignees

• Ericsson Telefon Ab L M

Inventors

• Mismar Faris
• Nammi Sairamesh

Classifications

• H04L43/02 Primary

  Capturing of monitoring data · CPC title

• H04L1/0027

  Scheduling of signalling, e.g. occurrence thereof · CPC title

• H04L43/067

  using time frame reporting · CPC title

• H04L1/0031

  Multiple signaling transmission (H04L1/1664, F15 take precedence) · CPC title

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title