Communication mechanism using demodulation reference signal based communication mode

Patent metadata

Field	Value
Publication number	US-9847860-B2
Application number	US-201214387258-A
Country	US
Kind code	B2
Filing date	Mar 23, 2012
Priority date	Mar 23, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

There is provided a mechanism for conducting a communication between at least one communication network control element such as an eNB and at least one communication element such as a UE wherein a DM RS based communication mode is used. DMRS (scrambling) sequences are generated wherein each DMRS sequence includes a set of calculation parameters being specific for the respective DMRS sequence, wherein the set of calculation parameters is configurable by the eNB during communication. For initializing each of the at least one scrambling sequence before receiving the configuration information, i.e. in an initial phase of the communication, a predetermined default value based on e.g. an UE_ID and being selectable from a set of predetermined default values is used for the set of calculation parameters in each DMRS sequence.

First claim

What is claimed is:

1. An apparatus comprising:
at least one processor; and
at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform at least the following:
to conduct with at least one communication network control element a communication by using a demodulation reference signal based communication mode for signals received from the at least one communication network control element;
to generate in the demodulation reference signal based communication mode at least one predefined scrambling sequence of a demodulation reference signal,
wherein each of the at least one scrambling sequence comprises a set of calculation parameters being specific for the respective scrambling sequence,
wherein the set of calculation parameters is configurable during the at least one communication on the basis of configuration information received from the at least one communication network control element; and

to select, for initializing each of the at least one scrambling sequence before receiving the configuration information, at least one predetermined default value selectable from a set of predetermined default values for the set of calculation parameters in each of the at least one scrambling sequence, wherein the at least one predetermined default value is determined by using an identification element identifier of a terminal device as a parameter of a preset algorithm.

2. The apparatus according to claim 1 , wherein
the initialization of the at least one scrambling sequence is based on
c init (└ n s /2┘+1)·(2 X+ 1)·2 16 +n SCID

where C init is the initialization code, n s is the number of the time slot, X is the calculation parameter whose value is selectable from values {x(0), x(1), . . . x(N−1)} for N>1, wherein N is the number of parameters configurable for a terminal device and x(n) (0<=n<N), and n SCID is a number related to a serving cell identification.

3. The apparatus according to claim 1 , wherein the at least one default value is determined on the basis of a physical cell identification element of a cell in which the communication is conducted.

4. The apparatus according to claim 1 , and the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus further to use the at least one selected predetermined default value for the set of calculation parameters until a control signaling is received comprising an indication to reconfigure the set of calculation parameters to values being different to the at least one selected default value.

5. The apparatus according to claim 1 , and the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus further to select the at least one default value on the basis of one of
a preset instruction for the demodulation reference signal communication mode, or
an information indicating which default value is to be set, the information being received via a control signaling.

6. A method comprising
conducting a communication with at least one communication network control element by using a demodulation reference signal based communication mode for signals received from the at least one communication network control element;
generating in the demodulation reference signal based communication mode at least one predefined scrambling sequence of a demodulation reference signal,
wherein each of the at least one scrambling sequence comprises a set of calculation parameters being specific for the respective scrambling sequence,
wherein the set of calculation parameters is configurable during the at least one communication on the basis of configuration information received from the at least one communication network control element; and

selecting, for initializing each of the at least one scrambling sequence before receiving the configuration information, at least one predetermined default value selectable from a set of predetermined default values for the set of calculation parameters in each of the at least one scrambling sequence, wherein the at least one predetermined default value is determined by using an identification element identifier of a terminal device as a parameter of a preset algorithm.

7. An apparatus comprising:
at least one processor; and
at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform at least the following:
to control and conduct a communication with at least one terminal device by using a demodulation reference signal based communication mode for signals transmitted to the at least one terminal device;
to apply in the demodulation reference signal based communication mode at least one scrambling sequence of a demodulation reference signal,
wherein each of the at least one scrambling sequence comprises a set of calculation parameters for the respective scrambling sequence,
wherein the set of calculation parameters is configurable during the at least one communication on the basis of configuration information transmitted to the at least one terminal device; and

to use, in an initial phase of the at least one communication, at least one predetermined default value selectable from a set of predetermined default values for the set of calculation parameters before sending the configuration information, wherein the at least one predetermined default value is determined by using an identification element identifier of a terminal device as a parameter of a preset algorithm.

8. The apparatus according to claim 7 , wherein
in the initial phase the at least one scrambling sequence is based on
c init =(└ n s /2┘+1)·(2 X+ 1)·2 16 +n SCID   (1)

where C init is the initialization code, n s is the number of the time slot, X is the calculation parameter whose value is selectable from values (x(0), x(1) f . . . x(N−1)} for N>1, wherein N is the number of parameters configurable for a terminal device and x(n) (0<=n<N), and n SCID is a number related to a serving cell identification.

9. The apparatus according to claim 7 , wherein the at least one predetermined default value is determined on the basis of a physical cell identification element of a cell in which the terminal device is located.

10. The apparatus according to claim 7 and the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus further to change the calculation parameter to a value being different to the default value and to send a control signaling to the terminal device indicating the change of the calculation parameter.

11. The apparatus according to claim 7 , and the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus further to send an information indicating which predetermined default value is to be used in the initial phase to the terminal device by using a control signaling.

12. A method comprising
controlling and conducting a communication with at least one terminal device by using a demodulation reference signal based communication mode for signals transmitted to the at least one terminal device;
applying in the demodulation reference signal based communication mode at least one scrambling sequence of a demodulation reference signal,
wherein each of the at least one scrambling sequence comprises a set of calculation parameters for the respective scrambling sequence,
wherein the set of calculation parameters i

Assignees

• Wang Xiaoyi
• Skov Peter
• Liu Jingxiu
• Miao Deshan
• Nokia Solutions & Networks Oy

Inventors

• Wang Xiaoyi
• Skov Peter
• Liu Jingxiu
• Miao Deshan

Classifications

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04L27/2613

  Structure of the reference signals · CPC title