Method and apparatus of allocating sounding reference signal resources

Patent metadata

Field	Value
Publication number	US-10326573-B2
Application number	US-201515509188-A
Country	US
Kind code	B2
Filing date	Sep 3, 2015
Priority date	Sep 4, 2014
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

The present disclosure relates to a pre-5 th -generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4 th -generation (4G) communication system such as a long term evolution (LTE). Various examples of the present disclosure provide a method of allocating sounding reference signal (SRS) resources. A base station of a target cell receives information of first cell edge terminals in an adjacent cell transmitted by the adjacent cell. The base station allocates SRS resources for a terminal in the target cell according to information of second cell edge terminals in the target cell and the information of the first cell edge terminals, and transmits information of the allocated SRS resources to the terminal. According to the mechanism, when there are cell edge terminals in both the target cell and the adjacent cell, it can be guaranteed that all SRS resources allocated to cell edge devices in the target cell are orthogonal to those allocated to cell edge devices in the adjacent cell. Thus, the impact of pilot contamination on system performances may be remarkably reduced.

First claim

The invention claimed is:

1. A method of allocating resources in a base station of a first cell, the method comprising:
receiving information of first terminals transmitted by a second cell, the first terminals being located in the second cell;
allocating resources to a terminal, which is one of second terminals in the first cell, based on information of the second terminals in the first cell and the information of the first terminals, and transmitting information of the allocated resources to the terminal; and
allocating resources selected from a primary set of resources to the terminal in the first cell,
wherein the information of the first terminals includes a number of the first terminals and information of resources allocated to the first terminals,
wherein resources allocated to the second terminals in the first cell are orthogonal to the resources allocated to the first terminals in the second cell if there are at least one of the second terminals in the first cell and at least one of the first terminals in the second cell,
wherein, if the resources are orthogonal in a code-domain, the resources orthogonal in the code-domain comprise orthogonal signals generated by applying spreading to a pseudo-random sequence using different orthogonal spreading sequences from a same orthogonal matrix,
wherein each of the orthogonal spreading sequences is a row or a column of at least one of a discrete Fourier transformation (DFT) matrix and the orthogonal matrix,
wherein the first cell and the second cell share the primary set of resources if there are at least one of the second terminals in the first cell and at least one of the first terminals in the second cell, and
wherein allocating the resources to the terminal in the first cell if there are the at least one of the second terminals in the first cell and the at least one of the first terminals in the second cell comprises:
selecting, from the primary set of resources, a first resource subset which has no intersection with a second resource subset selected by the second cell for the first terminals; and
allocating resources, from the first resource subset, to the terminal,
wherein resources in the first resource subset are orthogonal to resources in the second resource subset.

2. The method of claim 1 , further comprising:
allocating resources allocated to one of the first terminals in the second cell to another terminal in the first cell.

3. The method of claim 1 , further comprising:
allocating resources to the terminal in the first cell independently if there is no other terminal in at least one of the first cell and the second cell.

4. A method of allocating resources in a base station of a first cell, the method comprising:
receiving information of first terminals transmitted by a second cell, the first terminals being located in the second cell;
allocating resources to a terminal, which is one of second terminals in the first cell based on information of the second terminals in the first cell and the information of the first terminals, and transmitting information of the allocated resources to the terminal; and
allocating resources selected from a primary set of resources to the terminal in the first cell,
wherein the information of the first terminals includes a number of the first terminals and information of resources allocated to the first terminals,
wherein resources allocated to the second terminals in the first cell are orthogonal to the resources allocated to the first terminals in the second cell if there are at least one of the second terminals in the first cell and at least one of the first terminals in the second cell,
wherein, if the resources are orthogonal in a code domain, the resources orthogonal in a frequency domain comprise orthogonal resources in frames adopting a same frame structure in a secondary carrier that are generated by applying different cyclic shift intervals to a root sequence, resources allocated to cell edge terminals in one cell or cell center terminals in different cells are generated by cyclic shift intervals larger than a pre-defined threshold if an amount of available resources is less than a threshold, and resources allocated to a cell edge terminal and a cell center terminal are generated based on cyclic shift intervals smaller than the threshold,
wherein the first cell and the second cell share the primary set of resources if there are at least one of the second terminals in the first cell and at least one of the first terminals in the second cell, and
wherein allocating the resources to the terminal in the first cell if there are the at least one of the second terminals in the first cell and the at least one of the first terminals in the second cell comprises:
selecting, from the primary set of resources, a first resource subset which has no intersection with a second resource subset selected by the second cell for the first terminals; and
allocating resources, from the first resource subset, to the terminal,
wherein resources in the first resource subset are orthogonal to resources in the second resource subset.

5. The method of claim 4 , wherein allocating the resources to the terminals in the first cell if there are the at least one of the second terminals in the first cell and the at least one of the first terminals in the second cell comprises:
selecting, from the primary set of resources, a third resource subset which has no intersection with the first resource subset; and
allocating resources, from the third resource subset, to another terminal in the first cell,
wherein the third resource subset has shared resources with the second resource subset.

6. An apparatus for allocating sounding reference signal (SRS) resources, the apparatus comprising:
a receiving unit configured to receive information of first terminals transmitted by a second cell, the first terminals being located in the second cell; and
a resource allocating unit configured to allocate resources to a terminal, which is one of second terminals in a first cell, based on information of the second terminals in the first cell and the information of the first terminals, transmit information of the allocated resources to the terminal, allocate resources selected from a primary set of resources to the terminal in the first cell, select, from the primary set of resources, a first resource subset which has no intersection with a second resource subset selected by the second cell for the first terminals, and allocate resources from the first resource subset to the terminal,
wherein the information of the first terminals includes a number of the first terminals and information of resources allocated to the first terminals,
wherein resources allocated to the second terminals, in the first cell are orthogonal to the resources allocated to the first terminals in the second cell if there are at least one of the second terminals in the first cell and at least one of the first terminals in the second cell,
wherein, if the resources are orthogonal in a code-domain, the resources orthogonal in the code-domain comprise orthogonal signals generated by applying spreading to a pseudo-random sequence using different orthogonal spreading sequences from a same orthogonal matrix,
wherein each of the orthogonal spreading sequence is a row or a column of at least one of a discrete Fourier transformation (DFT) matrix and the orthogonal matrix,
wherein the first cell and the second cell share the primary set of resources if there are at least one of the second terminals in the first cell and at least one of the first terminals in the second cell, and
wherein resources in the first resource subset are orthogonal to resources in the second resource subset.

7. The apparatus of claim 6 , wherein the r

Assignees

• Samsung Electronics Co Ltd

Inventors

• Yuan Fang
• Yu Bin
• Zhu Dalin
• Sun Pengfei
• Lei Ming

Classifications

• 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

• H04L5/1469

  using time-sharing · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04L5/0091

  Signalling for the administration of the divided path, e.g. signalling of configuration information · CPC title