CN105323858A - Time Division Long Term Evolution (TD-LTE) system, frequency point switching method thereof and base station - Google Patents
Time Division Long Term Evolution (TD-LTE) system, frequency point switching method thereof and base station Download PDFInfo
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- CN105323858A CN105323858A CN201410342360.XA CN201410342360A CN105323858A CN 105323858 A CN105323858 A CN 105323858A CN 201410342360 A CN201410342360 A CN 201410342360A CN 105323858 A CN105323858 A CN 105323858A
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Abstract
The invention discloses a TD-LTE system, a frequency point switching method thereof and a base station, and relates to the field of communication technology. The method comprises that the carrier wave state of an available unlicensed spectrum is monitored; when carrier waves of certain unlicensed spectrum are interfered, a target switching frequency point is selected, and the protection interval of a special sub-frame in carrier wave signals is selected as frequency point switching time; frequency point switching is carried out on the interfered carrier waves within the assigned frequency point switching time to maintain the consistency of the bandwidth and physical uplink control channel parameters of the system before and after frequency point switching, so that the carrier wave signals can be transmitted continuously after frequency point switching; and a user terminal is indicated with the target switching frequency point and the frequency point switching time. Thus, rapid channel switching of the TD-LTE system in the unlicensed spectrum is realized, and the data transmission process which is carried out before frequency point switching can be continued after frequency point switching.
Description
Technical field
The present invention relates to communication technical field, the frequency changing method particularly in a kind of timesharing long evolving system, base station and system.
Background technology
Timesharing Long Term Evolution TD-LTE (TimeDivisionLongTermEvolution) technology is new generation broadband mobile communication wireless access technology, compared with the wireless access technology of existing 2G, 3G mobile communication system, the features such as it has, and transmission rate is high, propagation delay time is little, high QoS guarantee.At present, from the present situation of spectrum division, exempt to authorize frequency spectrum (UnlicensedSpectrum)) total amount to compare with the mandate frequency spectrum total amount of mobile communication be very considerable, when authorizing special frequency spectrum resource more and more nervous, exempt to authorize the value of frequency spectrum to operator more and more important.In 3GPPRAN62 plenary session, manuscript RP-132085 proposes to authorize Spectral integration to the research project verification in Long Term Evolution LTE system by exempting from.In June, 2014,3GPP exempts to authorize frequency spectrum to hold symposium for introducing specially.Can predict, 3GPP very important research direction after Release12 will exempt to authorize Spectral integration in LTE, forms LTE-U (LTEinUnlicensedSpectrum) standard.
A lot of wireless telecommunications system has been had to exempt to authorize in frequency range as wireless router, bluetooth etc. are operated at present, in order to avoid these equipment cause interference to radar system, reduce the interference of these equipment rooms simultaneously, some countries and regions except the conventional project such as power, frequency spectrum, also adds the requirement to characteristics such as dynamic frequency selections (DFS:DynamicFrequencySelection) to the requirement of these equipment especially.Obvious LTE-U exempts to authorize in frequency range to be operated in, and also needs to consider to introduce dynamic frequency selection mechanism.But exempt to authorize the carrier wave in frequency range to be limited to transmitted power, general coverage is less, and usually can not independence networking in LTE system, need authorizing the auxiliary lower work of frequency range carrier wave with the form of carrier aggregation.Although exempt to authorize the possibility of the available carrier wave in frequency range more, due to multiple wireless access technology RAT and the existence of other equipment, be not optimum selection according to available carrier wave number design system bandwidth of operation.The scene that may exist is available authorization carrier wave and exempts to authorize the bandwidth of carrier wave to exceed system works bandwidth.In such a scenario, it is significant to the balance of systematic function and cost for introducing the operating carriers frequency switching at runtime mechanism exempted from mandate frequency range.
But current LTE system can not the switching at runtime of support performance carrier frequency point, can not meet the demand of following LTE-U system.
Summary of the invention
For solving the problem, the present invention proposes the frequency changing method in a kind of timesharing long evolving system, base station and system, realizing TD-LTE system exempting to authorize the Fast Channel in frequency range to switch, reducing channel and switching the loss brought to systematic function, thus meeting the demand of LTE-U system.
The present invention proposes the frequency changing method in a kind of timesharing long evolving system, said method comprising the steps of:
Monitor available exempting from and authorize the Carrier State in frequency range;
When certain exempts to authorize the carrier wave in frequency range to be interfered, select target switches frequency, and selects the protection of special subframe in carrier signal to be spaced apart frequency switching time;
Within described frequency switching time of specifying, the carrier wave be interfered is carried out frequency switching, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated;
Target is switched frequency and frequency is indicated to described user terminal switching time.
Preferably; described special subframe is the subframe that in time-sharing system, base station equipment is transferred to reception by transmission; or end side is by receiving the subframe transferring transmission to; being interposed between base station side between described protection is from sending finish time to the interval received start time, is from receiving finish time to the interval sent start time in end side.
Preferably, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
System update message is sent to user terminal by mandate frequency range, by described system update message, the channel frequency of target switching channels and frequency is indicated to user terminal switching time.
Preferably, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
By radio resource control RRC signaling message, the channel frequency of target switching channels and frequency are indicated to user terminal switching time.
Preferably, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
Authorize the working frequency points in frequency range pre-configured to described user terminal all exempting from, by media interviews control MAC information, the channel frequency of target switching channels and frequency are indicated to user terminal switching time.
Preferably, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
Authorize the working frequency points in frequency range pre-configured to described user terminal all exempting from, by the instruction of carrier wave instructions field CIF information, the channel frequency of target switching channels and frequency are indicated to user terminal switching time.
The invention allows for a kind of base station, it is characterized in that, described base station comprises:
Monitoring modular, authorizes the Carrier State in frequency range for monitoring available exempting from;
Select module, during for exempting from when certain to authorize the carrier wave in frequency range to be interfered, select target switching frequency, and select the protection of special subframe in carrier signal to be spaced apart frequency switching time;
Frequency handover module, for the carrier wave be interfered being carried out frequency switching within described frequency switching time of specifying, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated;
Indicating module, for switching frequency and frequency is indicated to described user terminal switching time by target.
Preferably, described indicating module by any one information in system message, radio resource control RRC signaling, media interviews control MAC information and carrier wave instructions field CIF information or arbitrarily information combination target switched frequency and frequency is indicated to described user terminal switching time.
The invention allows for a kind of timesharing long evolving system, it is characterized in that, described system comprises above-mentioned arbitrary described base station.
The present invention proposes the frequency changing method in a kind of timesharing long evolving system, base station and system; the method to be finished the work the switching of frequency by utilizing the protection interval in the special subframe of timesharing Long Term Evolution TD-LTE system; realize supporting that TD-LTE system is exempting to authorize the Fast Channel in frequency range to switch, and reduces channel and switches the loss brought to systematic function.
Accompanying drawing explanation
Fig. 1 is the frequency changing method flow chart in a kind of timesharing long evolving system of proposing of the present invention;
Fig. 2 is a kind of application scenarios schematic diagram switched for frequency that the embodiment of the present invention proposes;
Fig. 3 is the schematic diagram of frame structure in the TD-LTE system proposed in the embodiment of the present invention;
Fig. 4 is the module diagram of a kind of base station that the present invention proposes.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
The embodiment of the present invention one proposes the frequency changing method in a kind of timesharing long evolving system, as shown in Figure 1, said method comprising the steps of:
S1. monitor available exempting from and authorize the Carrier State in frequency range;
S2. when certain exempts to authorize the carrier wave in frequency range to be interfered, select target switches frequency, and selects the protection of special subframe in carrier signal to be spaced apart frequency switching time;
S3. within described frequency switching time of specifying, the carrier wave be interfered is carried out frequency switching, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated;
S4. target is switched frequency and frequency is assigned to described user terminal switching time.
In embodiments of the present invention, lower powered wireless access base station SmallCell is except the carrier wave of use authority frequency range can using and exempt to authorize the carrier wave in frequency range, but exempt to authorize carrier wave independently not exist, need to use under the cooperation of authorizing carrier wave, operative scenario as shown in Figure 2, introduce by adopting carrier aggregation technology and exempt to authorize carrier wave, authorize carrier wave as main carrier, exempt to authorize carrier wave as auxiliary carrier wave.
Due to the coverage of SmallCell less (usual radius is within 300 meters), according to analysis above, eNB and UE side can complete tuning respectively in protection interval GP and GP_UE.Real-Time Monitoring can with exempting to authorize the Carrier State in frequency range, when eNB judges that certain of being polymerized exempts to authorize the auxiliary carrier wave in frequency range unavailable due to the interference of radar or other equipment, eNB determines to authorize the carrier wave in frequency range to switch to another one frequency and target to switch frequency in the appointment moment by exempting from, and keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated.Wherein Real-Time Monitoring with exempting to authorize the Carrier State in frequency range, can be measured based on eNB and also can report based on UE measurement or adopt the two comprehensive mode combined to carry out Real-Time Monitoring.
Need to change voltage controlled oscillator (VCO because the working frequency points switching wireless transceiver is tuning, VoltageControlledOscillator) input voltage, and this voltage is by phase-locked loop (PLL, PhaseLockingLoop) control, and then need by obtaining the output frequency of expectation to phase-locked loop adjustment to realize the switching of working frequency points.This adjustment of phase-locked loop needs to expend a certain amount of time, is tuning period by this timing definition in the embodiment of the present invention.Have data to show, in the IEEE802.11b transceiver of Maxim company, tuning period is 150us, and can be reduced to 40 ~ 80us in 802.11a network interface card.The size of tuning switching time has certain relation with the frequency interval of two channels switched, and frequency interval is larger, and tuning period is larger.Clearly propose in 2012 " new generation broadband wireless mobile communication net " national science and technology key special subjects problem " research and development of 1-4TD-LTE-Advanced terminal radio frequency chip engineering print " " support that wireless channel switches across frequency range; switching time <80us, facilitate networking frequency to select " performance assessment criteria.
In the embodiment of the present invention; in eNB side; the conversion of downlink state to uplink receiving state is carried out at special subframe in the frame structure of TD-LTE system; and between these two states, there is a protection interval GP; described special subframe is the subframe that in time-sharing system, base station equipment is transferred to reception by transmission; or end side is by receiving the subframe transferring transmission to; being interposed between base station side between described protection is from sending finish time to the interval received start time; at the interval that end side is from receiving finish time to transmission start time, as shown in Figure 3.
Different special subframe proportionings, the length of GP is different, as shown in the table:
Table 1: the GP length (unit: microsecond) during different special subframe proportioning
As can be seen from Table 1, the protection gap length of most of special subframe proportioning is more than 100 microseconds, so base station eNB to adopt the phase-locked loop device with fast frequency handoff functionality, protection interval in complete frequency switch.
Further, the method also comprises:
Support to send timing advance order to user terminal.
In the embodiment of the present invention, in UE side, in order to ensure that upward signal that the UE different from base station spacing launch can dropping in same receive window, base station eNB is needed to send timing advance order to user terminal, UE receives described timing advance order, timing advance (TimingAdvance, TA) is introduced when sending upward signal in UE side.Due to the existence of TA, the time interval GP_UE making UE side forward up emission state to by downlink receiving state is less than the GP of base station side, is specially:
GP_UE＝GP-N
TA*T
s-N
TAoffset*T
s
Wherein, N
tAvalue and distance dependent between UE and base station, general distance is larger, N
tAvalue is larger, preferably, and N
tAoffset=624, T
s=1/30720ms.Consider the restriction of transmitted power on licensing free frequency band, exempt to authorize the coverage of carrier wave usually less.Suppose that the coverage of LTE-U community is 300 meters, then radio wave propagation time delay is 1 microsecond, so the N of cell edge UE
tA* T
sbe approximately equal to 1 microsecond, N
tAoffset* T
sfor fixed value, approximate 20.3 microseconds.Therefore approximately short than GP 22 microseconds of GP_UE in this case.As can be seen from Table 1 under great majority configuration, UE side, the community special subframe of radius 300 meters transfers the interval GP_UE of transmission state to more than 100 microseconds by accepting state, therefore, we can switch by selecting suitable phase-locked loop device to complete UE side working frequency points in GP_UE.
Further, the channel frequency of target switching channels and frequency, by system update message being sent to user terminal in mandate frequency range, are indicated to user terminal by described system update message switching time by the step S4 in this method.
In embodiments of the present invention, base station eNB is transmitting system updating message in mandate frequency range, comprises and carry out system update message and send to UE in message.In updating message, indicate new bandwidth of operation and frequency switching instant to UE, the data transmission procedure do not executed after simultaneously indicating UE frequency to switch and measurement are configured on new frequency and can proceed.After UE receives system update message, in the protection interval of specifying special subframe, carry out the switching of frequency, after having switched, original data transmission procedure proceeds.
Further, the channel frequency of target switching channels and frequency can also be indicated to user terminal by radio resource control RRC signaling message switching time by the step S4 in this method.
In embodiments of the present invention, base station eNB can also be selected, by special RRC message, frequency switching command is sent to UE.Indicate new bandwidth of operation and frequency switching instant to UE in the message, the data transmission procedure do not executed after simultaneously indicating UE frequency to switch and measurement are configured on new frequency and can proceed.After UE receives RRC information, in the protection interval of specifying special subframe, carry out the switching of frequency, after having switched, original data transmission procedure proceeds.
Further, the channel frequency of target switching channels and frequency by authorizing the working frequency points in frequency range pre-configured to described user terminal all exempting from, can also be indicated to user terminal by media interviews control MAC information switching time by the step S4 in this method.
In embodiments of the present invention, all possible exempting from can also authorize the working frequency points in frequency range pre-configured to UE by eNB, be indicated to the new working frequency points of UE and frequency switching instant by MAC Control Element, the data transmission procedure do not executed after simultaneously indicating UE frequency to switch and measurement are configured on new frequency and can proceed.After UE receives media interviews control MAC information, in the protection interval of specifying special subframe, carry out the switching of frequency, after having switched, original data transmission procedure proceeds.
Preferably, the channel frequency of target switching channels and frequency by authorizing the working frequency points in frequency range pre-configured to described user terminal all exempting from, can also be indicated to user terminal by the instruction of carrier wave instructions field CIF information switching time by the step S4 in this method.
In the embodiment of the present invention, all possible exempting from can also authorize the working frequency points in frequency range pre-configured to UE by base station eNB, and after indicating frequency to switch, whether original communication process can continue.Be indicated to the new working frequency points of UE by the CIF territory in DCI, frequency switching instant adopts predefined mode, and except being exempted from except mandate carrier wave by what use, what other configured exempts to authorize carrier wave to be deactivation status.When UE find the carrier wave of CIF instruction be exempt to authorize the another one in frequency range not by use carrier wave time; can be judged as that eNB requires to carry out frequency switching; then UE carries out the switching of frequency in the protection interval of specifying special subframe, and after having switched, original data transmission procedure proceeds.
The frequency handoff procedure that the present invention proposes is controlled by eNB, and between base station eNB and user terminal UE, the coordination of working frequency points can be passed through any one approach or combination in any in system message update, radio resource control RRC signaling, media interviews control MAC information and carrier wave instructions field CIF information territory and realizes.
The present invention utilizes the protection interval between the descending transmission state in TD-LTE system special subframe and uplink receiving state to finish the work the switching of frequency, the auxiliary mechanism that ongoing data transmission procedure can proceed is ensured before and after frequency switches, comprise: before and after frequency switches, system bandwidth and PUCCH configuration relevant parameter should be tried one's best and do not changed, and at least can feed back by authorizing the main carrier in frequency range to make switching ACK/NACK corresponding to front ongoing PDSCH data transmission procedure; Before and after frequency switches, system bandwidth and PUSCH configuration relevant parameter should be tried one's best and do not changed, still can carry out to make switching front ongoing PUSCH data transmission procedure, thus reduction frequency switches the loss brought to systematic function, improves the experience of user.
The embodiment of the present invention two also proposed a kind of base station, and as shown in Figure 4, described base station comprises:
Monitoring modular 201, authorizes the Carrier State in frequency range for monitoring available exempting from;
Select module 202, during for exempting from when certain to authorize the carrier wave in frequency range to be interfered, select target switching frequency, and select the protection of special subframe in carrier signal to be spaced apart frequency switching time;
Frequency handover module 203, for the carrier wave be interfered being carried out frequency switching within described frequency switching time of specifying, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated;
Indicating module 204, for switching frequency and frequency is indicated to described user terminal switching time by target.
Further, described base station also comprises: sending module, for sending timing advance order to user terminal.
In embodiments of the present invention, indicating module 204 can by any one information in system message, radio resource control RRC signaling, media interviews control MAC information and carrier wave instructions field CIF information or arbitrarily information combination target switched frequency and frequency is indicated to described user terminal switching time.
The invention allows for a kind of timesharing long evolving system, this system comprises the base station shown in Fig. 4.Wherein, technical scheme is introduced with the base station shown in Fig. 4.In system, base station comprises: monitoring modular 201, authorizes the Carrier State in frequency range for monitoring available exempting from; Select module 202, during for exempting from when certain to authorize the carrier wave in frequency range to be interfered, select target switching frequency, and select the protection of special subframe in carrier signal to be spaced apart frequency switching time; Frequency handover module 203, for the carrier wave be interfered being carried out frequency switching within described frequency switching time of specifying, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated; Indicating module 204, for switching frequency and frequency is indicated to described user terminal switching time by target.
Frequency changing method in a kind of timesharing long evolving system adopting the present invention to propose, base station and system; to finish the work the switching of frequency by utilizing the protection interval in the special subframe of timesharing Long Term Evolution TD-LTE system; because the frequency switching of Receiver And Transmitter is what to complete in the protection interval of special subframe; therefore frequency switches the time that can not take transfer of data; and do not adopt and complete compared with scheme that frequency switches protecting in interval; there is the effect avoiding systematic function being brought to loss; and frequency switches more frequent, effect is more obvious.And can support that frequency switches fast due to the present invention, being conducive to the equipment such as TD-LTE system and WiFi, bluetooth, radar exempting to authorize in frequency range better coexists.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (9)
1. the frequency changing method in timesharing long evolving system, is characterized in that, said method comprising the steps of:
Monitor available exempting from and authorize the Carrier State in frequency range;
When certain exempts to authorize the carrier wave in frequency range to be interfered, select target switches frequency, and selects the protection of special subframe in carrier signal to be spaced apart frequency switching time;
Within described frequency switching time of specifying, the carrier wave be interfered is carried out frequency switching, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated;
Target is switched frequency and frequency is indicated to described user terminal switching time.
2. the method for claim 1; it is characterized in that; described special subframe is the subframe that in time-sharing system, base station equipment is transferred to reception by transmission; or end side is by receiving the subframe transferring transmission to; being interposed between base station side between described protection is from sending finish time to the interval received start time, is from receiving finish time to the interval sent start time in end side.
3. the method for claim 1, is characterized in that, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
System update message is sent to user terminal by mandate frequency range, by described system update message, the channel frequency of target switching channels and frequency is indicated to user terminal switching time.
4. the method for claim 1, is characterized in that, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
By radio resource control RRC signaling message, the channel frequency of target switching channels and frequency are indicated to user terminal switching time.
5. the method for claim 1, is characterized in that, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
Authorize the working frequency points in frequency range pre-configured to described user terminal all exempting from, by media interviews control MAC information, the channel frequency of target switching channels and frequency are indicated to user terminal switching time.
6. the method for claim 1, is characterized in that, described frequency and the frequency of target being switched is indicated to described user terminal comprises switching time:
Authorize the working frequency points in frequency range pre-configured to described user terminal all exempting from, by the instruction of carrier wave instructions field CIF information, the channel frequency of target switching channels and frequency are indicated to user terminal switching time.
7. a base station, is characterized in that, described base station comprises:
Monitoring modular, authorizes the Carrier State in frequency range for monitoring available exempting from;
Select module, during for exempting from when certain to authorize the carrier wave in frequency range to be interfered, select target switching frequency, and select the protection of special subframe in carrier signal to be spaced apart frequency switching time;
Frequency handover module, for the carrier wave be interfered being carried out frequency switching within described frequency switching time of specifying, keep frequency switch before and after system bandwidth consistent with physical uplink control channel parameter, make carrier signal frequency switching follow-up resume defeated;
Indicating module, for switching frequency and frequency is indicated to described user terminal switching time by target.
8. base station as claimed in claim 7, it is characterized in that, described indicating module by any one information in system message, radio resource control RRC signaling, media interviews control MAC information and carrier wave instructions field CIF information or arbitrarily information combination target switched frequency and frequency is indicated to described user terminal switching time.
9. a timesharing long evolving system, is characterized in that, described system comprises the arbitrary described base station of claim 7-8.
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| WO2021217510A1 (en) * | 2020-04-29 | 2021-11-04 | 华为技术有限公司 | Data transmission method and communication apparatus |
| CN113875208A (en) * | 2020-04-29 | 2021-12-31 | 华为技术有限公司 | Data transmission method and communication device |
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| CN105323858B (en) | 2018-09-04 |
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