Method and apparatus for implementing coordinated multiple point transmission

Patent metadata

Field	Value
Publication number	US-9722742-B2
Application number	US-201013265661-A
Country	US
Kind code	B2
Filing date	Apr 21, 2010
Priority date	Apr 24, 2009
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

The present invention discloses a method for implementing coordinated multiple point transmission CoMP, including: configuring, by the network side, a range setting group to a user equipment, UE, and acquiring the original mapping pattern of various cells in the group; receiving the channel information of various cells in the group returned by the UE; selecting, by the network side, cells for practically sending data to the UE currently, determining the update mapping patterns for the cells selected in the group performing CoMP, and controlling the selected various cells to send a physical downlink shared channel to the UE according to the update mapping pattern. The present invention further discloses an apparatus for implementing CoMP In accordance with the method and apparatus for implementing CoMP of the present invention, the mapping patterns of the cells for practically sending data to a UE are updated by acquiring the CRS and CSI-RS mapping locations of the original mapping pattern of cells of the range setting group to get the update mapping pattern for use in the CoMP, so that it is possible to meet the design principle of CRS and CSI-RS and guarantee the normal application of CoMP at the same time.

First claim

The invention claimed is:

1. A method for implementing a coordinated multiple point transmission (CoMP), comprising:
configuring, by a network side, a range setting group to a user equipment (UE);
acquiring original mapping patterns of a reference signal (RS) corresponding to a plurality of cells in the range setting group based on identification (ID) of the plurality of cells;
receiving channel information of the plurality of cells in the range setting group transmitted by the UE;
selecting, by the network side, cells for transmitting data to the UE currently;
determining update mapping patterns for the selected cells based on the acquired original mapping patterns of the RS; and
transmitting the data on a physical downlink shared channel (PDSCH) to the UE based on the determined update mapping patterns for the selected cells,
wherein the update mapping patterns for the selected cells are identical to each other,
wherein the update mapping patterns is determined to comprise at least one resource element (RE) corresponding to mapping locations of a cell-specific reference signal (CRS) and a channel state information reference signal (CSI-RS) in the original mapping patterns, and the at least one RE is not used for transmitting data, and
wherein after the selecting of the cells for transmitting the data to the UE and before the determination of the update mapping patterns, the method further comprises:
setting, by the network side, an indication in a physical downlink control channel (PDCCH) delivered to a serving cell, the indication associated with whether the cells for transmitting data to the UE comprise only the serving cell or not.

2. The method of claim 1 , wherein the configuring of the range setting group to the UE and the acquiring of the original mapping patterns of the plurality of cells in the range setting group comprises:
delivering, by the network side, cell identifications of the plurality of cells included in the range setting group to the UE, and acquiring the original mapping patterns of the plurality of cells according to a preset corresponding relation between the cell identification and the original mapping patterns of the plurality of cells.

3. The method of claim 2 , wherein the determination of the update mapping patterns for the cells selected from the range setting group performing the CoMP comprises:
for any one of the cells selected from the range setting group, identifying the resource element (RE) corresponding to mapping locations of the cell-specific reference signal (CRS) and the channel state information reference signal (CSI-RS) in the original mapping patterns of the RS for the one cell; and
acquiring an update mapping pattern for the RS by taking the identified RE as a time-frequency resource location that is not allowed to be used when the one cell performs the CoMP.

4. The method of claim 2 , wherein the setting of the indication further comprises:
setting the indication as one bit in the PDCCH delivered to a serving cell, setting the one bit as a valid state when the cells for currently transmitting data to the UE only include the serving cell, and setting the one bit as an invalid state when the cells for currently transmitting data to the UE do not only include the serving cell.

5. The method of claim 4 , wherein the determination of the update mapping patterns for the cells selected from the range setting group performing the CoMP comprises:
taking an original mapping pattern of the serving cell as an update mapping pattern used when the serving cell performs the CoMP when the cells for currently transmitting data to the UE only include the serving cell, and, when the cells for currently transmitting data to the UE do not only include the serving cell, for any one of the cells selected from the range setting group;
identifying a resource element (RE) corresponding to mapping locations of a cell-specific reference signal (CRS) and a channel state information reference signal (CSI-RS) in the original mapping patterns of all cells of the range setting group in an original mapping pattern of the RS for the one cell; and
acquiring the update mapping pattern of the RS by taking the identified RE as a time-frequency resource location that is not allowed to be used when the one cell performs the CoMP.

6. The method of claim 2 , wherein the setting of the indication further comprises:
setting the indication in the PDCCH delivered to a serving cell, the indication being used for identifying a subgroup to which cells for currently transmitting data to the UE belong, and the subgroup being a class classified according to cell-specific reference signal (CRS) mapping patterns regulated in a system.

7. The method of claim 6 , wherein the setting of the indication in the PDCCH delivered to the serving cell comprises:
setting, by the network side, six subgroups according to six types of CRS mapping patterns regulated in the system, and setting an indication of six bits of which each bit corresponds to a subgroup;
for each bit, setting the bit as a valid state when there is a subgroup corresponding to the bit in a set composed of the cells for currently transmitting data to the UE, and setting the bit as an invalid state when there is not a subgroup corresponding to the bit in the set composed of the cells for currently transmitting data to the UE; and
adding the indication to the PDCCH delivered to the serving cell.

8. The method of claim 6 , wherein the setting of the indication in the PDCCH delivered to the serving cell comprises:
setting, by the network side, three subgroups according to three effective CRS mapping patterns regulated in the system, and setting an indication of three bits of which each bit corresponds to a subgroup;
for each bit, setting the bit as a valid state when there is a subgroup corresponding to the bit in a set composed of the cells for currently transmitting data to the UE, and setting the bit as an invalid state where there is not a subgroup corresponding to the bit in the set composed of the cells for currently transmitting data to the UE; and
adding the indication to the PDCCH delivered to the serving cell.

9. The method of claim 6 , wherein the setting of the indication in the PDCCH delivered to the serving cell comprises:
setting, by the network side, three subgroups according to three effective CRS mapping patterns regulated in the system, and setting an indication of two bits, of which each bit corresponds to one of other two subgroups apart from the subgroup to which the serving cell belongs;
for each bit, setting the bit as a valid state when there is a subgroup corresponding to the bit in a set composed of the cells for currently transmitting data to the UE, and setting the bit as an invalid state when there is not a subgroup corresponding to the bit in the set composed of the cells for currently transmitting data to the UE; and
adding the indication to the PDCCH delivered to the serving cell.

10. The method of claim 6 , wherein the setting of the indication in the PDCCH delivered to the serving cell comprises:
setting, by the network side, six subgroups according to six types of CRS mapping patterns regulated in the system, or setting three subgroups according to three effective CRS mapping patterns regulated in the system, and setting an indication of one bit;
setting the one bit as a valid state when the cells for currently transmitting data to the UE and the serving cell belong to a same subgroup, and setting the one bit as an invalid state when the cells for currently transmitting data to the UE and the serving cell do not belong to the same subgroup; and
adding the indication to the PDCCH delivered to the servi

Assignees

• Li Yingyang
• Li Xiaoqiang
• Samsung Electronics Co Ltd

Inventors

• Li Yingyang
• Li Xiaoqiang

Classifications

• H04B7/024 Primary

  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

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04W48/08

  Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L5/0032 Primary

  Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation · CPC title