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Generation of MBSFN-DOB synchronization codes

A primary synchronization code and secondary synchronization code technology, applied in multiplexing code generation, code division multiplexing systems, electrical components, etc., can solve problems such as delayed cell search, WCDMA terminals do not attempt cell search, etc.

Active Publication Date: 2013-06-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, since the spectral position of the unpaired frequency band is known in advance, the WCDMA terminal may not attempt to perform cell search in the unpaired frequency band
On the other hand, for roaming WCDMA non-MBSFN capable terminals trying to access unpaired frequency bands, reading disabled cells may delay cell search at power-up

Method used

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  • Generation of MBSFN-DOB synchronization codes
  • Generation of MBSFN-DOB synchronization codes
  • Generation of MBSFN-DOB synchronization codes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] exist image 3 In the first embodiment illustrated in , the new PSC is used to modulate the primary SCH transmitted on the MBSFN DOB carrier. This new PSC is orthogonal to the PSC and SSC specified for WCDMA and TD-CDMA. Due to the orthogonality and low cross-correlation properties, the MBSFN DOB carrier (cell) cannot be observed by any non-MBSFNDOB capable terminal. The Secondary SCH sent on the MBSFNDOB carrier is the same as specified for WCDMA and no time offset is applied to the synchronization code.

[0050] exist Figure 4 and 5 In another illustrative embodiment, the primary SCH transmitted on the MBSFN DOB carrier is using the PSC specified for WCDMA (PSC WCDMA ) while in one slot (or possibly in two slots) of a frame modulated and in use of the new PSC (i.e., PSC NEW ) in the remaining time slots of the modulated frame.

[0051] 1. If PSC is allocated in slot #k WCDMA , where k=0...14, the PSC is allocated in the time slot not equal to #k in the frame ...

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Abstract

Physical downlink channels PPHY1, PHY2 are summed in a summation unit 10. The output of summation unit 10 is forwarded to another summation unit 12, where it is combined with the primary and secondary synchronization channels P-SCH, S-SCH. The secondary synchronization channel S-SCH is formed as in WCDMA. The primary synchronization channel P-SCH is formed by connecting a switch SW either to a code generator 14 generating the conventional code PSCWCDMA or a code generator 18 generating the code PSCNEW. The selection is controlled by a PSC controller 18. This controller can be adapted to produce a P-SCH in accordance with one of several formats. PSCNEW has the properties that it is a hierarchical Golay sequence constructed by a plurality of constituent sequences with at least one of the constituent sequences being the Golay sequence, and that it is orthogonal to the primary and secondary synchronization codes used in non-MBSFN capable WCDMA.

Description

technical field [0001] The present invention generally relates to MBSFN (Multicast Broadcast Single Frequency Network) DOB (Downlink Optimized Broadcast) cell search and primary synchronization code generation. Background technique [0002] Recently in 3GPP, MBMS (Multimedia Broadcast Multicast Service) over Single Frequency Network (MBSFN) was specified for Rel-7 UMTS Terrestrial Radio Access (UTRA) system. The MBSFN feature provides significantly higher spectral efficiency than Rel-6 MBMS and is primarily intended for broadcasting mobile TV services requiring high bit rates on dedicated MBMS carriers. Since it is broadcast only, MBSFN inherently targets transmissions in unpaired frequency bands. [0003] In SFN (Single Frequency Network) transmission, multiple base stations transmit the same waveform at the same moment, so that the terminal receives signals from all base stations, resulting in a behavior similar to one large cell. For UTRA systems, SFN transmission means...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7083H04J13/00H04J13/10H04B1/707
CPCH04J13/102H04J13/0014H04B1/7083H04B2201/70701
Inventor 拉尔斯·林德布姆迪尔克·格斯腾贝格尔埃里克·旺
Owner TELEFON AB LM ERICSSON (PUBL)