METHOD, APPARATUS AND SYSTEM FOR SCHEDULING SDMA CODEBOOKS

• US 20090285156A1
• Filed: 04/24/2009
• Published: 11/19/2009
• Est. Priority Date: 10/26/2006
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: ZHU, Hufei, Du, Yinggang, YANG, Luxi, HUANG, Yongming
• Application Number:
  US12/429,725
• Publication Number:
  US 20090285156A1
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Abstract

A method for scheduling an SDMA codebook includes: selecting, by a user, a most matching precoding matrix and a minimally interfering cluster in the SDMA codebook according to Channel State Information, CSI, of the user; calculating a data transmission rate supportable when the user undergoes interference caused by the minimally interfering cluster; and feeding back an index of the most matching precoding matrix, an index of the minimally interfering cluster, and the data transmission rate to a base station. An apparatus and system for scheduling an SDMA codebook is also provided.

Claims

1. A method for scheduling a Space Division Multiple Access, SDMA, codebook, the method comprising:

selecting, by a user, a most matching precoding matrix and a minimally interfering cluster in the SDMA codebook according to Channel State Information, CSI, of the user;

calculating a data transmission rate supportable when the user undergoes interference caused by the minimally interfering cluster; and

feeding back an index of the most matching precoding matrix, an index of the minimally interfering cluster, and the data transmission rate to a base station.

2. The method according to claim 1, further comprising:

selecting, by some users, a most matching precoding matrix and a minimally interfering cluster in the SDMA codebook according to their own Channel State Information, CSI;

selecting, by the rest of the users, a most matching column in the SDMA codebook according their own CSI;

calculating a data transmission rate supportable when some users undergo interference caused by the minimally interfering cluster, and calculating a data transmission rate supportable by the users that select the most matching column;

feeding back, by some users, an index of the most matching precoding matrix, an index of the minimally interfering cluster, and the data transmission rate to a base station; and

feeding back, by the users that select the most matching column, an index of the most matching column and the supportable data transmission rate to the base station.

3. The method according to claim 1, further comprising:

sorting, by the base station, users into multiple classes according to a cluster corresponding to the received index of the most matching precoding matrix and according to the index of the minimally interfering cluster;

selecting specific users in each class;

matching the selected specific users;

generating one or more matching pairs, wherein each matching pair comprises two users;

calculating the sum of data transmission rates fed back by the two users in the matching pair; and

comparing the sum of the data transmission rates between all the matching pairs, selecting a specific matching pair, and using the two users in the specific matching pair as currently scheduled transmitting users.

4. The method according to claim 3, wherein:

multiple users are sorted into the same class if;

most matching precoding matrixes received by the base station and fed back by the multiple users correspond to the same cluster, and minimally interfering clusters fed back by the multiple users are the same.

5. The method according to claim 3, wherein selecting of the specific users in each class comprises:

selecting the class of the user that is fed back in each class and has a maximum data transmission rate;

or

selecting the class of the user who fails to obtain services in a long time among all classes.

6. The method according to claim 3, wherein:

among the two users in the matching pair, the cluster corresponding to the most matching precoding matrix fed back by one user is the same as the minimally interfering cluster fed back by the other user.

7. The method according to claim 3, wherein:

the class is represented by (m, n), where m is a serial number of the cluster in the SDMA codebook corresponding to the index of the most matching precoding matrix, n is a value of the index of the minimally interfering cluster, and m and n are natural numbers not greater than 4.

8. The method according to claim 3, wherein:

if the class of the users sorted by the base station according to the cluster corresponding to the received index of the most matching precoding matrix and according to the index of the minimally interfering cluster lacks a corresponding feedback user, the class is null.

9. The method according to claim 3, wherein:

the selected specific users are matched; and

if one of the two users in the generated matching pair corresponds to zero data, data of a single user is sent without requiring SDMA.

10. An apparatus for scheduling Space Division Multiple Access, SDMA, comprising:

a precoding matrix selecting unit, adapted to select a most matching precoding matrix and a minimally interfering cluster in an SDMA codebook according to Channel State Information, CSI, of a user;

a calculating unit, adapted to calculate a data transmission rate supportable when the user undergoes interference caused by the minimally interfering cluster; and

a feedback unit, adapted to feed back an index of the most matching precoding matrix, an index of the minimally interfering cluster, and the data transmission rate to a base station.

11. A system for scheduling Space Division Multiple Access, SDMA, comprising a base station and a terminal, wherein:

the terminal comprises;

a precoding matrix selecting unit, adapted to select a most matching precoding matrix and a minimally interfering cluster in an SDMA codebook according to Channel State Information, CSI, of a user;

a calculating unit, adapted to calculate a data transmission rate supportable when the user undergoes interference caused by the minimally interfering cluster; and

a feedback unit, adapted to feed back an index of the most matching precoding matrix, an index of the minimally interfering cluster, and the data transmission rate to a base station;

the base station comprises;

a user classifying unit, adapted to;

sort users into multiple classes according to a cluster corresponding to the index of the most matching precoding matrix and according to the index of the minimally interfering cluster, wherein the index is received by a base station;

a specific user selecting unit, adapted to select specific users in each class respectively;

a matching and calculating unit, adapted to;

match the selected specific users;

generate one or more matching pairs, wherein each matching pair comprises two users; and

calculate the sum of data transmission rates fed back by the two users in the matching pair; and

a scheduled user selecting unit, adapted to;

compare the sum of the data transmission rates between all the matching pairs, select a specific matching pair, and use the two users in the specific matching pair as currently scheduled transmitting users.

12. The system according to claim 11, wherein:

multiple users are sorted into the same class if;

most matching precoding matrixes received by the base station and fed back by the multiple users correspond to the same cluster, and minimally interfering clusters fed back by the multiple users are the same.

13. The system according to claim 11, wherein the scheduled user selecting unit selecting of the specific users in each class comprises:

selecting the class of the user that is fed back in each class and has a maximum data transmission rate;

or

selecting the class of the user who fails to obtain services in a long time among all classes.