CN102843747B - The signaling method of a kind of synchronizing channel, broadcast channel and UE cut-in method - Google Patents
The signaling method of a kind of synchronizing channel, broadcast channel and UE cut-in method Download PDFInfo
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Abstract
The invention provides signaling method and the UE cut-in method of synchronizing channel under a kind of discrete spectrum system and broadcast channel, comprise: on the predeterminated position in each bunch of frequency range of described discrete spectrum system, send the signal of synchronizing channel and broadcast channel; UE receives the signal of synchronizing channel on each bunch of described discrete spectrum system and broadcast channel, and resident and initiate access according to best one bunch of the signal behavior signal received.By the present invention, detection probability that is synchronous and broadcast channel can be improved, effectively improve the access probability of UE.
Description
Technical field
The present invention relates to the synchronizing channel in communication system and broadcast channel technology, the synchronizing channel particularly under a kind of discrete spectrum system and the signaling method of broadcast channel and UE cut-in method.
Background technology
Current 230MHz frequency range is mainly used in data radio station and bears long-range data collection task, can only be used for some simple communications applications because the speed provided is very low, cannot meet intelligent grid and the growing business demand of Sensor Network.According to the planning in national grid future, require to find a kind of new broadband communications technologies, meet the business demand in its distribution automation, load management, power information collection, smart power grid user service, emergency first-aid repair, the large field of special area video monitoring six.
230MHz frequency range product based on TD-LTE technology is that the demand provides good solution, this product is inherited in the smaller advantage of the intersymbol interference of the channel relatively flat of orthogonal multi-sub carrier transmission uniqueness of OFDM and channel, innovatively play the expansibility of OFDMA system, frequency selectivity, dispatching flexibility etc., and creationaryly absorb carrier aggregation, the advanced communication theory such as frequency spectrum perception, constitute low-power consumption of new generation, high spectrum utilization, the multi-business communication system flexibly of high reliability.Farthest can meet the business need of power load monitoring system, simultaneously for the planning of national grid next generation network provides solid technological accumulation and Applied D emonstration.
In existing ofdm communication system, synchronizing channel and broadcast channel are all be arranged in one section of continuous print frequency range to carry out signal transmission, as shown in Figure 1.But when utilizing the discrete frequency range of multistage (bunch) to communicate, if only design broadcast channel in cluster frequency range, so when this continuous print channel is subject to strong jamming, UE just cannot search synchronizing channel, community can not be completed resident, more cannot receive the information of broadcast channel.
Summary of the invention
The invention provides the signaling method of synchronizing channel under discrete spectrum system and broadcast channel, detection probability that is synchronous and broadcast channel can be improved.
Meanwhile, present invention also offers the UE cut-in method under discrete spectrum system, can effectively improve UE access probability.
For achieving the above object, the present invention adopts following technical scheme:
Synchronizing channel under discrete spectrum system and a signaling method for broadcast channel, comprising:
On predeterminated position in each bunch of frequency range of described discrete spectrum system, send the signal of synchronizing channel and broadcast channel.
Preferably, the predeterminated position in each bunch of frequency range is identical.
Preferably, the predeterminated position in described each bunch of frequency range is: on the middle subband of respective cluster frequency range.
Preferably, the signal of described synchronizing channel and broadcast channel on same subband according to time-interleaved transmission.
Carry out the method for UE access according to the signal sent according to said method, comprising:
UE receives the signal of synchronizing channel on each bunch of described discrete spectrum system and broadcast channel, and resident according to best one bunch of the signal behavior signal received.
Preferably, described UE receives the signal of synchronizing channel on each bunch and broadcast channel and is:
On UE, configure the subband numbering at synchronizing channel and broadcast channel signal place in each bunch in advance, described UE, according to the described subband numbering of configuration, respective sub-bands receives synchronizing channel and broadcast channel signal.
Preferably, described UE receives the signal of synchronizing channel on each bunch and broadcast channel and is:
Described UE carries out blind check on the subband of each bunch, receives the signal of described synchronizing channel and broadcast channel.
Preferably, when in arbitrary bunch of frequency range of described discrete spectrum system, access customer number exceedes pre-determined threshold, by busy flag set in this broadcast channel signal of arbitrary bunch;
During UE access, by busy flag set bunch to be set to access priority minimum.
Preferably, when except busy flag set bunch except, when described UE cannot access other bunches or community, described UE access busy flag set bunch, eNodeB carries out unified resource scheduling.
As seen from the above technical solution, in the present invention, on the predeterminated position in each bunch of frequency range of discrete spectrum system, send the signal of synchronizing channel and broadcast channel; UE receives the signal of synchronizing channel on each bunch of described discrete spectrum system and broadcast channel, and resident and initiate access according to best one bunch of the signal behavior signal received.Like this, owing to sending synchronizing channel and broadcast channel in each bunch of frequency range of discrete spectrum system, even if wherein part bunch is subject to strong jamming and cannot detects, UE still can receive synchronizing channel and broadcast channel in other bunches, thus improve the detection probability of synchronizing channel and broadcast channel, effectively improve the access probability of UE.
Accompanying drawing explanation
Fig. 1 is the transmission schematic diagram of synchronizing channel and broadcast channel in prior art;
Fig. 2 be in the present invention synchronizing channel and broadcast channel schematic diagram is set;
Fig. 3 is that the signal of synchronizing channel and broadcast channel in the present invention sends schematic diagram.
Embodiment
For making object of the present invention, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is described in further details.
The present invention gives the signaling method of synchronizing channel under a kind of discrete spectrum system and broadcast channel, and provide the method for carrying out UE access according to the synchronous and broadcast channel signal sent further.Next specific implementation of the present invention is described in detail.
The signaling method of synchronizing channel of the present invention and broadcast channel comprises: in the community of discrete spectrum system, the position being used for transfer synchronous channel and broadcast channel is specified in advance in each bunch, preassigned position sends the signal of synchronizing channel and broadcast channel in each bunch, and synchronizing channel in each bunch is identical with the signal that broadcast channel transmits.
After carrying out the signal transmission of synchronizing channel and broadcast channel according to the method described above, the method of carrying out UE access according to the signal of this transmission comprises: UE receives the signal of synchronizing channel on each bunch and broadcast channel, and resident and initiate access according to best one bunch of the signal behavior signal received.
In the signaling method and UE cut-in method of above-mentioned synchronous and broadcast channel, when UE receives the signal of synchronizing channel and broadcast channel, can by the mode of blind check or also can by preserving in UE synchronously in advance and the mode of broadcast channel information.
Particularly, by in the mode of blind check, UE does not know the particular location of synchronizing channel and broadcast channel in each bunch of frequency range in advance, this UE, when accessing, carries out blind check to each subband in each bunch of frequency range, searches for synchronous and broadcast channel wherein, after searching synchronous and broadcast channel, receive corresponding signal, and contrast the corresponding signal in each bunch of frequency range, select best one bunch of signal resident and initiate access.Under the manner, UE does not need extra memory space to preserve positional information that is synchronous and broadcast channel, saves the storage resources in UE.
And by when in UE, preservation mode that is synchronous and broadcast channel information carries out Signal reception in advance, need in advance subband numbering that is synchronous in each bunch of frequency range and broadcast channel place to be kept in UE, when UE accesses, directly according to the subband numbering of preserving, respective sub-bands receives the signal of synchronizing channel and broadcast channel; And the corresponding signal compared in each bunch of frequency range, select best one bunch of signal to access.Under the manner, UE directly can determine information that is synchronous and broadcast channel, does not need subband one by one to carry out search that is synchronous and broadcast channel, can save the processing time; But, need the memory space expended on UE to preserve positional information that is synchronous and broadcast channel.
In the signaling method of above-mentioned synchronous and broadcast channel, be synchronous in advance and broadcast channel designated bearing position time, can the synchronous and broadcast channel in each bunch of frequency range be specified on identical position, here same position refers to the relative position of respective channel in this bunch of frequency range, such as, specify the middle subband of each bunch of frequency range for the signal of transmitting synchronous and broadcast channel.Under this mode, synchronous identical with the position of broadcast channel due in each bunch of frequency range, therefore when UE accesses, if adopt blinded fashion to receive synchronous and broadcast channel signal, detect synchronous and broadcast channel in the first bunch of frequency range after, the same position of other bunch of frequency range receives synchronous and broadcast channel, does not need again and broadcast channel signal synchronous by sub-band detection.
More preferably, if specify the middle subband of each bunch of frequency range for the signal of transmitting synchronous and broadcast channel, then during UE access, other subbands may be switched to from resident subband (middle subband) and carry out service communication, such placement method that is synchronous and broadcast channel will reduce the amplitude of UE access time frequency point span, thus reduction frequency adjusts the frequency deviation brought.Wherein, when certain bunch of frequency range comprises even number subband, middle subband can be defined as
or
n is sub band number.
Be described for three discrete bunch frequency ranges.As shown in Figure 2, three discrete bunch frequency ranges are distributed in 223.025 ~ 228.000MHz, 228.025 ~ 230.000MHz and 230.025 ~ 235.000MHz respectively, respectively there are 15,10 and 15 subbands in three bunches of frequency ranges, synchronous and broadcast channel are all set in three bunches of frequency ranges.The most middle subband that synchronous and broadcast singal is arranged in each bunch of frequency range sends, and can reduce UE access is like this amplitude that frequency is crossed over, thus reduction frequency adjusts the frequency deviation brought.The default location of first bunch and the 3rd bunch broadcast is the 8th subband (each 7 subbands in left and right), and the broadcast location of second bunch is positioned at the 5th subband (5 4, one side subbands).
When the signal carrying out synchronous and broadcast channel sends, can send according to existing mode, namely signal that is synchronous and broadcast channel sends in same subframe.Preferably, because discrete spectrum system is generally resource-constrained narrow-band communication system, therefore for save more multiple resource for service data transmission, can by synchronizing channel and broadcast channel on same subband according to time-interleaved transmission, namely in adjacent sub-frame, send the signal of synchronizing channel and the signal of broadcast channel in turn, for the signalling formula of the synchronous of ofdm system and broadcast channel as shown in Figure 3.
In addition, when UE accesses discrete spectrum system, as previously mentioned, bunch of access selecting signal best in each bunch of frequency range.But, consider that discrete spectrum system is generally resource-constrained narrow-band communication system, resident users Limited Number on one bunch, therefore, preferably, when sending broadcast channel signal, if when the access customer number in certain bunch of frequency range exceedes pre-determined threshold, by busy flag set in the broadcast channel signal of this bunch of frequency range, during UE access, the access priority of bunch frequency range of busy flag set is set to minimum.Wherein, pre-determined threshold can be determined according to parameters such as the bandwidth sum access customer numbers of system.If UE cannot access the non-set of other busy marks bunch or other communities cannot be accessed, so UE still can access a busy mark set bunch, by eNodeB United Dispatching resource, to receive this UE.Like this, the resident users number of each bunch can be coordinated on the one hand, the access probability of UE can be improved on the other hand.
Above-mentioned signaling method and the UE cut-in method being synchronizing channel in the present invention and broadcast channel.Wherein by arranging multiple identical synchronous and broadcast channel, improve detection probability that is synchronous and broadcast channel.Namely in each discrete bunch frequency range, all arrange synchronizing channel and broadcast channel, UE can search synchronizing channel and broadcast channel in each bunch, thus completes the reception of the resident and broadcast message in community.Method of the present invention has good noiseproof feature, when there is strongly disturbing situation in multiple bunches, as long as there is one bunch not to be subject to strong jamming, UE still can complete the reception of synchronizing channel and broadcast channel, thus improves the probability that UE searches synchronizing channel and broadcast channel.Meanwhile, method of the present invention carries out transmission that is synchronous and broadcast channel at the ad-hoc location (as middle subband) of each bunch, and can be reduced in read broadcast channel in different bunches and the amplitude of frequency span brought, reduction frequency adjusts the frequency deviation brought.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. the synchronizing channel under discrete spectrum system and a signaling method for broadcast channel, it is characterized in that, the method comprises:
On predeterminated position in each bunch of frequency range of described discrete spectrum system, send the signal of synchronizing channel and broadcast channel.
2. method according to claim 1, is characterized in that, the predeterminated position in each bunch of frequency range is identical.
3. method according to claim 2, is characterized in that, the predeterminated position in described each bunch of frequency range is: on the middle subband of respective cluster frequency range.
4. method according to claim 1, is characterized in that, the signal of described synchronizing channel and broadcast channel on same subband according to time-interleaved transmission.
5. carry out the method for UE access according to the signal sent according to described method arbitrary in claim 1 to 4, it is characterized in that, the method comprises:
UE receives the signal of synchronizing channel on each bunch of described discrete spectrum system and broadcast channel, and resident according to best one bunch of the signal behavior signal received.
6. method according to claim 5, is characterized in that, the signal that described UE receives synchronizing channel on each bunch and broadcast channel is:
On UE, configure the subband numbering at synchronizing channel and broadcast channel signal place in each bunch in advance, described UE, according to the described subband numbering of configuration, respective sub-bands receives synchronizing channel and broadcast channel signal.
7. method according to claim 5, is characterized in that, the signal that described UE receives synchronizing channel on each bunch and broadcast channel is:
Described UE carries out blind check on the subband of each bunch, receives the signal of described synchronizing channel and broadcast channel.
8. method according to claim 5, is characterized in that, when in arbitrary bunch of frequency range of described discrete spectrum system, access customer number exceedes pre-determined threshold, by busy flag set in this broadcast channel signal of arbitrary bunch;
During UE access, by busy flag set bunch to be set to access priority minimum.
9. method according to claim 8, is characterized in that, when except busy flag set bunch except, when described UE cannot access other bunches or community, described UE access busy flag set bunch, eNodeB carries out unified resource scheduling.
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| CN101686529A (en) * | 2008-09-26 | 2010-03-31 | 大唐移动通信设备有限公司 | Method, system and device for broadcasting system information |
| CN101883397A (en) * | 2009-05-08 | 2010-11-10 | 大唐移动通信设备有限公司 | Load control method, system and device |
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