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Method and equipment for transmitting downlink synchronous channel

A technology of synchronous channel and main synchronous channel, applied in communication between multiple stations, multi-frequency code system, etc., can solve the problem of not fully utilizing P-SCH, etc., and achieve cost saving, performance improvement, and utilization rate improvement Effect

Inactive Publication Date: 2007-07-18
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, the existing technology does not make full use of the characteristics of P-SCH and S-SCH, as well as the characteristics of multi-cell broadcast / multicast services and unicast services for design

Method used

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  • Method and equipment for transmitting downlink synchronous channel
  • Method and equipment for transmitting downlink synchronous channel
  • Method and equipment for transmitting downlink synchronous channel

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Experimental program
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Embodiment 1

[0089] In the first embodiment, it is assumed that there is only one switching point between the short CP subframe and the long CP subframe in a frame, the short CP subframe is in front, the long CP subframe is in the back, and the first pilot is at the first symbols are sent, the second pilot is not sent, and P-SCH and S-SCH are time-division multiplexed. As shown in Figure 7.

[0090] The base station sends the P-SCH in the first OFDM symbol of the first long CP subframe. In this subframe, the first pilot may not be sent, but the P-SCH is used instead of the first pilot. This is because the P-SCH has the conditions to be a long CP subframe pilot: 1) the same P-SCH is sent in each cell, and 2) the P-SCH is a known sequence. The base station sends the S-SCH in the last OFDM symbol of the last short CP subframe.

[0091] User equipment receives P-SCH for cell search and channel estimation.

[0092] For the channel estimation of the first long CP subframe, the user equipment ...

Embodiment 2

[0097] In the second embodiment, it is assumed that there is only one switching point between the short CP subframe and the long CP subframe in a frame, the short CP subframe is in front, the long CP subframe is in the back, and the first pilot is at the first Symbols are sent, the second pilot is not sent, P-SCH and S-SCH are frequency-division multiplexed or code-division multiplexed. As shown in Figure 8.

[0098] The base station sends the P-SCH and the S-SCH in the first OFDM symbol of the first long CP subframe. In this subframe, the first pilot may not be sent, but the first pilot may be replaced by the P-SCH. This is because the P-SCH has the conditions to be a long CP subframe pilot: 1) the same P-SCH is sent in each cell, and 2) the P-SCH is a known sequence.

[0099] User equipment receives P-SCH for cell search and channel estimation.

[0100] For the channel estimation of the first long CP subframe, the user equipment can use the P-SCH and the first pilot of the...

Embodiment 3

[0105] In the third embodiment, it is assumed that there is only one long CP subframe in a frame, and there are two switching points between the short CP subframe and the long CP subframe, and the first pilot is sent in the first symbol of the subframe, and not sent The second pilot, P-SCH and S-SCH are time-division multiplexed. As shown in Figure 9.

[0106] The base station sends S-SCH in the first OFDM symbol of the long CP subframe, and sends P-SCH in the second OFDM symbol, in order to obtain the entire time-frequency grid of the long CP subframe through pilot interpolation in the long CP subframe The channel coefficient of , the pilot symbol is sent in the last symbol of the subframe.

[0107] User equipment receives P-SCH for cell search and channel estimation.

[0108] For channel estimation of long CP subframes, user equipment can use the P-SCH and pilot symbols in long CP subframes to estimate the channel coefficients of their time-frequency grids, and then use in...

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Abstract

A method for transmitting downlink synchronous channels in a long CP sub-frame includes: a base station transmits a primary synchronous channel P-SCH and a sub-synchronous channel S-SCH in the long CP sub-frame, a user device receives them used in searching in local areas and channel estimation, in this way, synchronous channels can be used in public pilot apart from search in local areas, and sending P-SCH and S-SCH in long sub-frames can increase performance of synchronization.

Description

technical field [0001] The present invention relates to a mobile wireless communication system, in particular to a device and method for sending a downlink synchronization channel in a subframe containing a long CP in 3GPP LTE. Background technique [0002] At present, the 3GPP standardization organization has begun to carry out long-term evolution (LTE) of its existing system specifications. Among many physical layer transmission technologies, Orthogonal Frequency Division Multiplexing (OFDM) technology has become a promising one among all downlink schemes because of its high spectrum utilization rate and low processing complexity. [0003] OFDM technology is essentially a multi-carrier modulation communication technology. Its basic principle is to decompose a high-rate data stream into several low-rate data streams and transmit them simultaneously on a group of mutually orthogonal sub-carriers. OFDM technology has performance advantages in many aspects due to its multi-ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/26
Inventor 李迎阳张玉建李小强李周镐王婷
Owner BEIJING SAMSUNG TELECOM R&D CENT