Method and apparatus for discontinuous reception in mobile terminal

Patent metadata

Field	Value
Publication number	US-9369199-B2
Application number	US-99269409-A
Country	US
Kind code	B2
Filing date	May 12, 2009
Priority date	May 16, 2008
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A method and apparatus for discontinuous reception (DRX) in a mobile terminal are disclosed. The discontinuous reception method includes: receiving DRX information for DRX operation based on DRX cycles having an on-duration and an off-duration; determining, when semi-persistent resources are allocated, an offset of the DRX cycles so that the time of semi-persistent resource allocation belongs to the on-duration of one DRX cycle; checking whether a packet is successfully received through the allocated semi-persistent resources; and performing, when a packet is successfully received, DRX operation according to the received DRX information and determined offset. The discontinuous reception apparatus performs discontinuous reception using the method.

First claim

The invention claimed is:

1. A method for discontinuous reception (DRX) by a mobile terminal, comprising:
receiving DRX information for DRX operation defined by a DRX cycle having an on-duration and an off-duration;
determining, if a message for allocation of a semi-persistent resource is received, an offset of the DRX cycles based on the received message for allocation of the semi-persistent resource;
checking whether a packet is successfully received through the semi-persistent resource;
identifying a DRX start time at which the on-duration starts based on the determined offset and the DRX information after the packet is successfully received through the semi-persistent resource; and
performing the DRX operation according to the DRX start time.

2. The method of claim 1 , wherein the DRX information comprises a DRX cycle length and an on-duration length.

3. The method of claim 1 , wherein the offset corresponds to one of reception time of the message for allocation of the semi-persistent resource, a time ahead by at least one sub-frame time from reception of the message for allocation of the semi-persistent resource, and a time behind by at least one sub-frame time from reception of the message for allocation of the semi-persistent resource.

4. An apparatus for discontinuous reception (DRX) in a mobile terminal, comprising:
a transceiver configured to receive DRX information for DRX operation defined by a DRX cycle having an on-duration and an off-duration; and
a controller configured to:
determine an offset of the DRX cycle based on a message for allocation of a semi-persistent resource if the message for allocation of the semi-persistent resource is received
check whether a packet is successfully received through the semi-persistent resource,
identify a DRX start time at which the on-duration starts based on the determined offset and the DRX information after the packet is successfully received through the semi-persistent resource, and
perform the DRX operation according to the DRX start time.

5. The apparatus of claim 4 , wherein the DRX information comprises a DRX cycle length and an on-duration length.

6. The apparatus of claim 4 , wherein the controller is further configured to determine the offset so that the offset corresponds to one of reception time of the message for allocation of the semi-persistent resource, a time ahead by at least one sub-frame time from reception of the message for allocation of the semi-persistent resource, and a time behind by at least one sub-frame time from reception of the message for allocation of the semi-persistent resource.

7. The method of claim 1 , wherein the determining of the offset of the DRX cycle comprises determining the offset as n sub-frame times before or after reception of the message for allocation of the semi-persistent resource,
wherein n is an arbitrary positive integer.

8. The method of claim 1 , wherein the identifying of the DRX start time comprises:
identifying the DRX start time using the equation:
the DRX start= n*DRX cycle length,

wherein, n is an arbitrary positive integer.

9. The apparatus of claim 4 , wherein the controller determines the offset as n sub-frame times before or after reception of the semi-persistent resource,
wherein, n is an arbitrary positive integer.

10. The apparatus of claim 4 , wherein the controller identifies the DRX start time using the following equation:
the DRX start= n*DRX cycle length,
wherein, n is an arbitrary positive integer.

11. The method of claim 1 , wherein the semi-persistent resource is allocated to the on duration of the DRX cycle.

12. The apparatus of claim 4 , wherein the semi-persistent resource is allocated to the on-duration of the DRX cycle.

Assignees

• Kim Soeng-Hun
• Samsung Electronics Co Ltd

Inventors

• Kim Soeng-Hun

Classifications

• H04B7/26 Primary

  at least one of which is mobile · CPC title

• H04W72/11

  Semi-persistent scheduling · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W76/28 Primary

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title