A kind of synchronization among base stations mode of user equipment assistedTechnical field
The present invention relates to synchronization among base stations field, the synchronization among base stations mode that particularly a kind of subscriber equipment (UE) is auxiliary.
Background technology
Along with wireless communications market increases rapidly, the requirement for synchronization among base stations mode is also varied.The method of synchronization mainly comprises system clock synchronization and air frame sychronisation two kinds, wherein, system clock synchronization refers to synchronous (bit timing) of the internal operation clock of all devices, and air frame sychronisation refers to synchronous (the frame timing) of the frame signal communicated between base station.Air frame sychronisation technology is exactly the transmitting-receiving slot synchronization that will tie up, thus reduces interference, reaches and improves covering quality, increases the object of frequency efficiency.Base station synchronization is on the basis of clock synchronous, ensures that the start-phase of each base station frame is consistent.Can realize synchronously, as GPS, IEEE 1588 etc. with uniform external clock between base station.But due to the restriction of deployment scenario, external clock well can not provide synchronous service sometimes, cause synchronization among base stations unstable, sometimes cannot be synchronous; Along with the development studied wireless telecommunications, propose the good mode adopting the air interface synchronization mode between base station to provide synchronization among base stations.But in actual deployment, owing to the reason such as to block, cause the air interface synchronization between base station well not carry out, make the synchronous of minizone still there is very large leak, synchronously can not realize completely between base station.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides one and reported to base station by UE, the synchronization among base stations mode of synchronous adjustment is carried out according to reporting information in base station.
For achieving the above object, technical scheme of the present invention is the synchronization among base stations mode that a kind of UE assists, and comprises the steps:
Step one: UE receives the signal of the non-serving base stations except serving BS, and has comparatively strong jamming to indicate to serving base stations report;
Step 2: base station issues to UE and synchronously reports instruction after receiving the comparatively strong jamming instruction that UE reports;
Step 3: UE receives and synchronously reports instruction, the synchronizing channel of demodulation non-serving base stations, measures synchronization discrepancy, to serving base stations report;
Step 4: serving BS carries out synchronous adjustment according to the synchronization discrepancy information reported.
Further, in step one, the signal of non-serving base stations meets requirement synchronous between UE assistant base station.
Further, step 2 also comprises base station and judges the comparatively strong jamming instruction that UE reports, if synchronous with non-serving base stations signal, ignores this information; If do not carried out with non-serving base stations signal synchronously, issue to UE and synchronously report instruction.
Further, after UE receives and synchronously reports instruction in step 3, detect the transmission time difference of serving BS and non-serving base stations signal, to serving base stations report.
Further, described synchronization discrepancy have on the occasion of and negative value.
Adopt technique scheme, the invention has the beneficial effects as follows: realize synchronization among base stations by UE is auxiliary, effectively can ensure the synchronism between adjacent domain base station, make up the deficiency of uniform external clock synchronous and air interface synchronization, reduce because deployment scenario restriction and to block etc. that reason causes cannot be synchronous.
Accompanying drawing explanation
Fig. 1 is the flow chart of the synchronization among base stations mode that a kind of UE provided by the present invention assists.
Embodiment
As shown in Figure 1, the synchronization among base stations mode that a kind of UE is auxiliary, supposes that UE also receives the signal of other non-serving base stations except serving BS, and wherein the signal of the non-serving base stations that signal is the strongest can meet this UE and carries out synchronously.First UE has comparatively strong jamming to indicate (HighInterference indicator HII) to serving base stations report, after serving BS receives the comparatively strong jamming instruction that UE reports, judge, if carried out with other base station synchronously, then ignore this information; If do not carried out with other base station synchronously, then issue to UE and synchronously report instruction (synchronization indicator SI); After UE receives this information, demodulation non-serving base stations synchronizing channel, and estimate two synchronization among base stations differences (synchronization difference SD), after measuring this synchronization discrepancy, serving BS is reported.Serving BS carries out synchronous adjustment according to this information.
The synchronization among base stations mode that a kind of UE provided by the present invention is auxiliary, design synchronization discrepancy needs consideration positive and negative, then quantizes according to smallest synchronization required precision according to maximum possible synchronization discrepancy between different base station.Such as, UE measurement obtains maximum synchronization discrepancy between two base stations at 1ms, and synchronously requires at 0.00025ms, so needs indicating range 1 ~ 4000, needs 13bit (1 symbol bit adds 12 data bit).
The above embodiment only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.