INSERTING METHOD OF DOWNLINK COMMON PILOT

• US 20090129491A1
• Filed: 09/12/2006
• Published: 05/21/2009
• Est. Priority Date: 09/29/2005
• Status: Active Grant

• Current Assignee: Shanghai Ultimate Power Communications Technology Co., Ltd.
• Original Assignee: Shanghai Ultimate Power Communications Technology Co., Ltd.
• Inventors: Suo, Shiqiang, Wang, Yingmin, Sun, Shaohui
• Granted Patent: US 7,860,058 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/2653 for logical channel control
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

The present invention discloses a method for inserting a downlink common pilot in a TDD system and more particularly to a method for inserting a downlink common pilot in a TDD system based on OFDMA technology and the method includes two steps. A: data to be transmitted are divided into several segments to be transmitted in several continuous time periods, wherein each time period includes several slots with at least one downlink slot; B: a common pilot is inserted in one downlink slot in the time period. Therefore, the scheduling based on the frequency domain can be achieved by measuring the common pilot channel.

Claims

1. A method for inserting a downlink common pilot, which is adaptable to the OFDMA TDD system and comprises steps of:

A;

dividing data to be transmitted into several segments to be transmitted in several continuous time periods, each time period comprising several slots with at least one downlink slot; and

B;

inserting a common pilot in one downlink slot in the time period.

2. The method according to claim 1, wherein the time period comprises slots in one or more frame.

3. The method according to claim 2, wherein in step A, the time period is a scheduling time period including at least one downlink slot and one uplink slot after the downlink slot, wherein each downlink slot in each frame of the data to be transmitted only belongs to one scheduling time period.

4. The method according to claim 2, wherein in step A, the time period is a prior scheduling time period including at least one downlink slot and one uplink slot with a last slot being an uplink slot, wherein each downlink slot in each frame of the data to be transmitted only belongs to one prior scheduling time period.

5. The method according to claim 2, wherein in step A, the time period is a minimum scheduling time period including at least one downlink slot and one uplink slot with any downlink slot being before any uplink slot, wherein each downlink slot in each frame of the data to be transmitted only belongs to one minimum scheduling time period.

6. The method according to claim 2, wherein when TDD system based on OFDMA adopts a same frame structure with TD-SCDMA system and when in each sub-frame of the TD-SCDMA system, normal slots TS0, TS4, TS5 and TS6 are downlink slots and TS1, TS2 and TS3 are uplink slots, TS4, TS5 and TS6 in each sub-frame and TS0, DwPTS, GP, UpPTS, TS1, TS2, and TS3 in a subsequent sub-frame are allocated into a time period and a downlink common pilot is inserted into one of the TS0 and DwPTS in each time period.

7. The method according to claim 2, wherein when TDD system adopts a same frame structure with TD-SCDMA system and when in each sub-frame of the TD-SCDMA system, normal slots TS0, TS2, TS3, TS5, and TS6 are downlink slots and TS1 and TS4 are uplink slots, TS5 and TS6 in each sub-frame and TS0, DwPTS, GP, UpPTS, and TS1 in a subsequent sub-frame are allocated into a time period a and TS2, TS3, TS4 are allocated into a time period b, a downlink common pilot is inserted into one of the TS0 and DWPTS in the time period a and a downlink common pilot is inserted into the TS3 in the time period b.

8. The method according to claim 2, wherein when TDD system adopts a same frame structure with TD-SCDMA system and when in each sub-frame of the OFDMA TDD system, normal slots TS0, TS2, TS4 and TS6 are downlink slots and TS1, TS3 and TS5 are uplink slots, TS6 in each sub-frame and TS0, DwPTS, GP, UPPTS and TS1 in a subsequent sub-frame are allocated into a time period c, TS2 and TS3 are allocated into a time period d, and TS4 and TS5 are allocated into a time period e, a downlink common pilot is inserted into one of the TS0 and DwPTS in the time period c, a downlink common pilot is inserted into the TS2 in the time period d and a downlink common pilot is inserted into the TS4 in the time period e.