Base station

FIELD: information technology.

SUBSTANCE: base station, which sends a synchronisation signal over a synchronisation channel using the system frequency band which is less than the maximum system frequency band, in a radio communication system which supports use of multiple frequency bands, has a multiplexing unit configured to multiplex the synchronisation channel and a channel other than the synchronisation channel, based on reception filter characteristic used in the mobile station. The multiplexing unit can accommodate the synchronisation channel and the channel other than the synchronisation channel at continuous subcarriers. In another version, the multiplexing unit can allocate a protective band or a cyclic prefix for the transition band of the reception filter.

EFFECT: high accuracy of detecting signals.

2 cl, 7 dwg

 

The technical field

This invention relates to a base station which forms the channel synchronization for transmission in the mobile station.

The level of technology

In wideband multiple access code division multiple access (Wideband Code Division Multiple Access W-CDMA) mobile station performs a cell search using a top-down physical channel, called channel synchronization Channel SCH). Channel SCH includes two subchannel: primary sync channel (Primary SCH, S-SCH) and a secondary sync channel (Secondary SCH, S-SCH) (see "W-CDMA MOBILE COMMUNICATIONS SYSTEM" edited by Keiji Tachikawa, Japan, March 15, 2002, str).

Channel P-SCH is used by the mobile station for detecting the distribution of time intervals (slots). Channel S-SCH is used by the mobile station for detecting the timing of frames and code groups, scrambling code group spread spectrum). The mobile station performs a quick search combs through these two channels SCH.

The signals P-SCH and S-SCH for transmission are code-multiplexed in the time domain. The mobile station performs the reverse of the widening operation in relation to the signals of the P-SCH and S-SCH and separates them. Since the signals P-SCH and S-SCH passed a code-multiplexed and transmitted with dynamometrical time, they are exposed to the same fluctuations in the channel. Thus, when the correlation detection signal S-SCH, the mobile station can perform a synchronous detection signal S-SCH using the detected signal P-SCH as a reference signal (pilot signal). Thus with high accuracy is the detection signal of the S-SCH.

It is expected that in future schemes mobile access will use OFDM modulation (Orthogonal Frequency Division Multiplexing, multiplexing orthogonal frequency division), with greater stability in terms of distribution across multiple paths (multipath propagation).

In the communication system that uses one of these schemes, mobile access, depending on the selected operator frequency range, the structure of the base station and the application uses system wide frequency band (for example, 20 MHz) and more narrow system bandwidth (e.g., 5 MHz). Using these frequency bands, different operators can provide their services.

For example, as shown in figure 1, the spectrum of the OFDM communication system supporting multiple system bandwidths may be used for transmission using OFDM within the system bandwidth (5 MHz)which is less than the maximum system bandwidth (e.g. the measures 20 MHz).

When combined base station with a different system frequency bands, the base station transmits the synchronization signal sync channel using the minimum system bandwidth (for example, a width of 1.25 MHz). Using the minimum system bandwidth, the mobile station can receive the synchronization signal without the need for pre-specified information about the system frequency band to the base station with which the mobile station is trying to establish a connection. In other words, the mobile station can receive the synchronization signal sync channel with the minimum system bandwidth.

When the synchronization signal is transmitted using the minimum system bandwidth to the base station with a wider system bandwidth is unused bandwidth. When the unused bandwidth is used for a channel other than channel synchronization, it is necessary to reduce interference with channel synchronization in each mobile station.

Disclosure of inventions

The main purpose of the present invention is a base station, which can improve the reception quality of the channel synchronization in the mobile station.

In one aspect of the present invention proposes a base station, the implementation is managing the transmission of the synchronization signal sync channel using the system bandwidth, which is less than the maximum system bandwidth in a communication system supporting multiple system bandwidths containing the multiplexing unit, configured to multiplex the channel synchronization and channel other than channel synchronization, based on the characteristics of the filter technique used in the mobile station.

In accordance with the variants of implementation of the present invention can be improved reception quality of the channel synchronization in the mobile station.

Brief description of drawings

Figure 1 shows the spectrum in the OFDM communication system supporting multiple system bandwidths.

2 shows the response of the filter.

Figure 3 shows a diagram illustrating the multiplexing of the sync channel and other channels in accordance with the first embodiment of the present invention.

Figure 4 is a diagram illustrating the multiplexing of the sync channel and other channels in accordance with a second embodiment of the present invention.

Figure 5 is a diagram illustrating the multiplexing of the sync channel and other channels in accordance with a third embodiment of the present invention.

Figure 6 shows a diagram illustrating the multiplexing is the anal, synchronization, and other channels in accordance with the fourth embodiment of the present invention.

Figure 7 shows the structure of a base station in accordance with the embodiment of the present invention.

The following notation is used:

10 - base station

101 - forming unit sync channel

103 - forming unit channel data

105 - unit multiplexing

107 - transfer filter

The implementation of the invention

Below is a description of preferred embodiments of the present invention with reference to the accompanying drawings. As illustrated in figure 2, defines the following terms related to the characteristic of a filter used in the embodiments of the invention.

"Bandwidth" means the frequency range within which the signals are ignored by the filter. Band suppression" means the frequency range within which the signals do not pass the filter. "Transition strip" means a frequency band located between the bandwidth and band suppression. The ideal case is to use the filter without transition band, which is referred to as the "ideal filter".

The first option exercise

Below with reference to figure 3 describes the approach consisting in the multiplexing channel synchronization and data channels, in the case when the transition band of the filter receiving in the mobile station can is essentially not be taken into account (filter receiving close to the ideal filter).

When the transition band of the filter receiving in the mobile station can essentially not be taken into account, the base station allocates a channel synchronization and data channels on a continuous subcarriers. This method of multiplexing channel synchronization and data channels allows efficient use of frequency resources. On the other hand, may increase the cost of the mobile station due to the need of a filter with a narrower transition bands in order to remove the interference from the data feed.

The second option exercise

Below with reference to figure 4 describes the approach consisting in assigning protective bands for the transition bands of the filter receiving in the mobile station and the multiplexing channel synchronization and channel data.

In the first embodiment, probably the occurrence of interference between the data channels and channel synchronization. In the second embodiment, for the transition bands of the filter receiving in the mobile station are assigned to the guard band. In particular, it is not used subcarriers corresponding transition bands.

The purpose of protective strips for multiplexing channel synchronization and data channels allows the mobile station to use a filter with a wider transition bands (the filter with a gradual silt is smooth clipping or filter of lower order).

A third option exercise

Below with reference to figure 5 describes the approach consisting in assigning cyclic prefixes for the transition bands of the filter receiving in the mobile station and the multiplexing channel synchronization and channel data.

As mentioned above in the description of the first variant implementation, the probability of interference between the data channels and channel synchronization. In the third embodiment, for the transition bands of the filter receiving in the mobile station are assigned cyclic prefixes. That is, a cyclic prefix CP1 component with a low frequency is generated through the use of copies of the signal SCH1 component with a higher frequency within the bandwidth of the channel synchronization. Similarly, a cyclic prefix SR in a component with a higher frequency is generated through the use of copies of the signal SCH2 component with a low frequency within the bandwidth of the channel synchronization.

Such appointment cyclic prefix allows the mobile station to combine the cyclic prefix CP1 component with a low frequency and the signal SCH1 component with a higher frequency within the bandwidth of the channel synchronization after filtering, to reproduce the original signal SCH1. Similarly, this paragraph which allows the mobile station to combine the cyclic prefix SR in a component with a higher frequency and signal SCH2 component with a low frequency within the bandwidth of the channel synchronization after filtering, to reproduce the original signal SCH2. Thus, in the mobile station is easy to perform lower discretization (downsampling).

The fourth option exercise

Below with reference to Fig.6 describes the approach consisting in the combination of the filter characteristics of the transmission in the base station and filter receiving in the mobile station and the multiplexing channel synchronization and data channels in accordance with the third embodiment.

As an example, combining the characteristics of the filter transmission filter and reception, the base station and the mobile station use the filters on the type of the root Nyquist filter (root Nyquist filter with the same characteristics. When is the multiplication characteristics of the filter transmission and the characteristics of the filter of reception can be obtained response of the filter of the reception in the third embodiment. Accordingly, the base station may assign a cyclic prefixes, as described above, and to produce a multiplexing channel synchronization and channel data.

Although in the fourth embodiment describes an approach consisting in the combination of the filter characteristics of the transmission filter and the reception and the multiplexing channel synchronization and data channels in accordance with the third embodiment, it may be another approach, Ostoji in combining the filter characteristics of the transmission filter and the reception and the multiplexing channel synchronization and data channels in accordance with the first or second embodiment.

The design of the base station

7 shows a base station 10 serving for the implementation of the foregoing embodiments. The base station 10 includes a block 101 formation of the channel synchronization unit 103 formation of the channel data block 105 multiplexing and filter 107 transmission. When implementing the embodiments from the first to the third filter 107 transmission in the base station 10 is not required.

Block 101 formation of the channel synchronization generates information distribution in time or similar, which should be detected by all mobile stations. Block 103 formation of the channel data generates data that must be transmitted to the mobile station.

Block 105 multiplexing produces multiplexing channel synchronization and channel data. Block 105 multiplexing allocates a channel synchronization subcarriers corresponding to the minimum system frequency bands, so that the mobile station can receive the synchronization signal sync channel without pre-specified information about the system frequency band of the base station. Then block 105 multiplexing allocates a data channel on the subcarriers other than the subcarriers are used for channel synchronization. When placing the channel data block 105 multiplexing may be imposed on the shape of the protective band or cyclic prefix.

When you are filtering channel synchronization taking into account the combined characteristics of the filter 107 transmission filter and the reception characteristic of the filter 107 transmission adapts to the characteristics of the filter intake.

Although in the above embodiments, the base station performs the multiplexing channel synchronization and data channels, the base station can multiplex the sync channel and any channel other than channel synchronization. For example, the base station can multiplex channel synchronization and control channel.

This application is based on Japanese priority application No. 2006-225921, filed August 22, 2006, the contents of which are fully incorporated herein by reference.

1. The base station performing transmission of the synchronization signal sync channel using the system bandwidth which is less than the maximum system bandwidth in a communication system supporting multiple frequency bands containing the multiplexing unit, configured to multiplex the channel synchronization and channel other than channel synchronization, based on the characteristics of the filter technique used in the mobile station, and the multiplexing unit carries out the purpose cyclic the ski prefix for transition band of the filter receiving and multiplexing channel and synchronization channel, other than the sync channel.

2. The base station performing transmission of the synchronization signal sync channel using the system bandwidth which is less than the maximum system bandwidth in a communication system supporting multiple frequency bands containing the multiplexing unit, configured to multiplex the channel synchronization and channel other than channel synchronization, based on the characteristics of the filter technique used in the mobile station, and the filter transmission; a multiplexing unit responsible for the appointment of cyclic prefix for the transition band, obtained by combining the characteristics of the filter transmission filter and reception, and a multiplexing channel synchronization and channel other than channel synchronization.



 

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