Method and device for monitoring downlink control channel

Patent metadata

Field	Value
Publication number	US-2016255609-A1
Application number	US-201314442463-A
Country	US
Kind code	A1
Filing date	Nov 14, 2013
Priority date	Nov 14, 2012
Publication date	Sep 1, 2016
Grant date	—

Abstract

A method for monitoring a control channel in a wireless communication system and a wireless device using the same are provided. The wireless device monitors a downlink control channel in at least one physical resource block (PRB) pair of a subframe that is assigned for an enhanced physical downlink control channel (EPDCCH) set. A beatstream for downlink control information of the downlink control channel is scrambled by a scrambling sequence that is initialized on the basis of a scrambling initialization value allocated to the EPDCCH set.

First claim

What is claimed is:

1 . A method for monitoring a control channel in a wireless communication system, the method comprising:
monitoring, by a wireless device, a downlink control channel in at least one physical resource block-pair of a subframe that is assigned for an enhanced physical downlink control channel (EPDCCH) set, wherein a bit stream for downlink control information on the downlink control channel is scrambled with a scrambling sequence that is initialized based on a scrambling initialization value assigned for the EPDCCH set.

2 . The method of claim 1 , wherein the scrambling sequence is obtained from a pseudo-random sequence, and the pseudo random-sequence is initialized with c init =(floor(ns/2))2 9 +n i , where ns denotes a slot number within a radio frame, floor (x) denotes a largest integer not greater than x, and n i denotes the scrambling initialization value assigned for the EPDCCH set.

3 . The method of claim 2 , wherein the pseudo-random sequence is defined by:
c ( n )=( x 1 ( n+Nc ) +x 2 ( n+Nc )) mod 2 x 1 ( n+ 31)=( x 1 ( n+ 3) +x 1 ( n )) mod 2 x 2 ( n+ 31)=( x 2 ( n+ 3) x 2 ( n+ 2) +x 2 ( n+ 1) x 2 ( n )) mod 2 where Nc=1600, n=0, . . . , N−1, and N denotes a length of the pseudo-random sequence.

4 . The method of claim 2 , wherein the bit stream b(i) for the downlink control information on the downlink control channel is scrambled with the scrambling sequence c(i) according to (b(i)+c(i)) mod 2.

5 . The method of claim 1 , wherein the at least one physical resource block-pair of the subframe includes at least one enhanced control channel element (ECCE).

6 . The method of claim 1 , wherein the step of monitoring the downlink control channel includes:
demodulating the downlink control information on the downlink control channel to obtain the bit stream for the downlink control information; and descrambling the bit stream for the downlink control information with the scrambling sequence.

7 . The method of claim 1 , wherein the bit stream for the downlink control information has a cyclic redundancy check (CRC) that is scrambled with an identifier of the wireless device.

8 . The method of claim 1 , further comprising:
receiving, by the wireless device, configuration information to configure the EPDCCH set from a base station, the configuration information including a resource assignment indicating the at least one physical resource block-pair and scrambling initialization information indicating the scrambling initialization value.

9 . The method of claim 8 , wherein the configuration information further includes an identifier of the EPDCCH set.

10 . A device configured to monitor a control channel in a wireless communication system, the device comprising:
a processor; and a memory operatively coupled with the processor and storing instructions that when executed by the processor causes to the device to monitor a downlink control channel in at least one physical resource block-pair of a subframe that is assigned for an enhanced physical downlink control channel (EPDCCH) set, wherein a bit stream for downlink control information on the downlink control channel is scrambled with a scrambling sequence that is initialized based on a scrambling initialization value assigned for the EPDCCH set.

11 . The device of claim 10 , wherein the scrambling sequence is obtained from a pseudo-random sequence, and the pseudo random-sequence is initialized with c init =(floor(ns/2))2 9 +n i , where ns denotes a slot number within a radio frame, floor (x) denotes a largest integer not greater than x, and n i denotes the scrambling initialization value assigned for the EPDCCH set.

12 . A method for transmitting downlink control information in a wireless communication system, performed by a base station, the method comprising:
generating a bit stream for downlink control information; generating a scrambling sequence; scrambling the bit stream for the downlink control information with the scrambling sequence; and transmitting the scrambled bit stream in at least one physical resource block-pair of a subframe that is assigned for an enhanced physical downlink control channel (EPDCCH) set, wherein the scrambling sequence is initialized based on a scrambling initialization value assigned for the EPDCCH set.

13 . The method of claim 12 , wherein the scrambling sequence is generated from a pseudo-random sequence, and the pseudo random-sequence is initialized with c init =(floor(ns/2))2 9 +n i , where ns denotes a slot number within a radio frame, floor (x) denotes a largest integer not greater than x, and n i denotes the scrambling initialization value assigned for the EPDCCH set.

Assignees

• Lg Electronics Inc

Inventors

• Kim Hakseong
• Seo Hanbyul
• Kim Byounghoon

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04J13/16 Primary

  Code allocation · CPC title

• H04L25/03866

  using scrambling · CPC title

• H04L5/00

  Arrangements affording multiple use of the transmission path · CPC title