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Methods for transmitting synchronization channel and broadcast channel, methods for receiving synchronization channel and broadcast channel and apparatus

A technology of synchronous channel and synchronous signal, which is applied in the direction of synchronous device, transmission path sub-channel allocation, wireless communication, etc. It can solve problems such as initial access failure, achieve the effects of avoiding conflicts, increasing flexibility, and ensuring transmission performance

Inactive Publication Date: 2014-03-26
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For existing UEs, when they try initial access in a cell working in NCT mode, their initial access must fail

Method used

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  • Methods for transmitting synchronization channel and broadcast channel, methods for receiving synchronization channel and broadcast channel and apparatus
  • Methods for transmitting synchronization channel and broadcast channel, methods for receiving synchronization channel and broadcast channel and apparatus
  • Methods for transmitting synchronization channel and broadcast channel, methods for receiving synchronization channel and broadcast channel and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] It is assumed that the time-frequency structure of the DMRS and the time-frequency structure of the CSI-RS in the existing LTE version are reused, and the TRS is assumed to reuse the time-frequency structure of the existing CRS port 0. Here, for FDD and TDD systems, it is assumed that those OFDM symbols that can be used to carry CSI-RS in both systems are not used to transmit P-SCH or S-SCH. According to the method of the present invention, a new relative position of P-SCH and S-SCH different from the existing LTE system is introduced, and a consistent new relative position is adopted in the FDD and TDD systems of NCT.

[0117] Figure 6 A schematic diagram of a synchronization channel to a general CP frame structure is shown. In a general subframe, in order to avoid collision with OFDM symbols used for DMRS, CSI-RS and TRS, only OFDM symbols 1, 2, 3 of the first slot and OFDM symbol 1 of the second slot can be used to carry P-SCH and S-SCH. For the DwPTS of the TDD ...

Embodiment 2

[0121] It is assumed that the time-frequency structure of the DMRS and the time-frequency structure of the CSI-RS in the existing LTE version are reused, and the TRS is assumed to reuse the time-frequency structure of the existing CRS port 0. Here, for each duplex mode (FDD or TDD) system, it is guaranteed that all OFDM symbols available for CSI-RS are not used to transmit P-SCH or S-SCH. According to the method of the present invention, a new relative position of P-SCH and S-SCH different from the existing LTE system is introduced, and a consistent new relative position is adopted in the FDD and TDD systems of NCT.

[0122] Figure 8 A schematic diagram of a synchronization channel to a general CP frame structure is shown. For the TDD system, P-SCH and S-SCH are transmitted simultaneously in the DwPTS, and occupy OFDM symbols 0 and 1 of the DwPTS respectively. For FDD systems, such as Figure 8 As shown, the P-SCH and the S-SCH may respectively occupy OFDM symbols 1 and 2 ...

Embodiment 3

[0169] In the NCT system, for each P-BCH burst, the technical solution of the present invention ensures that the number of REs used for P-BCH transmission is close to or equal to that of the existing LTE system. That is to say, the NCT system of the present invention is consistent with the existing LTE system; and for the NCT system, it can transmit P-BCH on 4 OFDM symbols. Here, some REs in the 4 OFDM symbols may be used for other purposes, such as carrying TRS, and these REs used for other purposes will not be used for carrying P-BCH. Here, the P-BCH mapping structure may be independently designed for the FDD and TDD systems; or, in order to increase consistency, the same P-BCH mapping structure may be used in the FDD and TDD systems.

[0170] According to the design of the existing LTE system, for the general CP subframe structure of the FDD system, OFDM symbols 5, 6 in the first slot and OFDM symbols 2, 3, 5, 6 in the second slot can be used to transmit CSI -RS. Such as ...

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Abstract

The invention provides a method for transmitting a synchronization channel. The method comprises the following steps that: synchronous signals transmitted on a P-SCH and an S-SCH are generated; the synchronous signals are multiplexed on specific OFDM symbols so as to form the P-SCH and the S-SCH, wherein the OFDM symbols do not carry any one kind of signals of DMRS, CSI-RS and TRS; and the P-SCH and the S-SCH are transmitted. The invention also discloses a method for transmitting a P-BCH. According to the technical scheme of the invention, conflict between the P-SCH and the S-SCH and the OFDM symbols of the DMRS, CSI-RS and TRS can be avoided, and therefore, the flexibility of system configuration can be improved, and the complexity for UE to search synchronization channels of an existing LTE system and an existing NCT system can be decreased. According to the technical scheme of the invention, the conflict between the P-BCH and the OFDM symbols of the CSI-RS can be avoided, and therefore, the flexibility of CSI-RS configuration of a system can be increased, and the transmission performance of the P-BCH of the NCT system can be ensured.

Description

technical field [0001] The present invention relates to a wireless communication system, and more particularly, the present invention relates to methods and devices for sending and receiving synchronization channels and broadcast channels. Background technique [0002] In the 3GPP LTE system, the length of each radio frame is 10ms, which is equally divided into 10 subframes. A downlink transmission time interval (TTI) is defined on a subframe. Such as figure 1 Shown is the frame structure of the FDD system, each downlink subframe includes two slots, for the general cyclic prefix (CP) length, each slot contains 7 OFDM symbols; for the extended CP length, each slot contains 6 OFDM symbols. Such as figure 2 Shown is the frame structure of the TDD system. Each wireless frame is divided into two half-frames with a length of 5 ms; subframe 1 and subframe 6 respectively contain 3 special fields, namely downlink pilot time slot (DwPTS), guard interval (GP) and Uplink Pilot Tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04L27/26
CPCH04L5/001H04L5/0082H04W56/00H04W72/0446H04W72/00H04L5/143H04L1/00H04L5/0048H04L5/0053
Inventor 孙程君李迎阳
Owner BEIJING SAMSUNG TELECOM R&D CENT
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