CN103457628B - TD-LTE wave detection synchronization method and system - Google Patents
TD-LTE wave detection synchronization method and system Download PDFInfo
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Abstract
The invention provides a TD-LTE wave detection synchronization method and system. The method comprises the steps: achieving the switching between an uplink and an downlink by detecting the length of a guard interval, the length of an uplink pilot frequency and the length of an uplink subframe in a TD-LTE signal, determining the position of the guard interval in a special subframe and determining a switching point of the uplink and the downlink by detecting the time length of a downlink subframe and the time length of a downlink pilot frequency, and achieving the accurate switching between the uplink and the downlink due to the fact that the points in time when the whole uplink is switched to the downlink and the downlink is switched to the uplink are completely for frame structural features of the TD-LTE signal. In addition, the whole switching process can be achieved only through a programmable logic device, other pieces of hardware are not required, the achieving is easy, and therefore the TD-LTE wave detection synchronization method is easy to achieve, low in achieving cost and capable of ensuring synchronization precision.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to TD-LTE detection synchronizing method and system.
Background technology
Along with 3G industry steps into climax gradually in the whole world, bear the LTE(Long TermEvolution of 3G to 4G evolution, Long Term Evolution) just experiencing crucial developing period at present, TD-LTE is the evolution technology of TD-SCDMA, and TD-LTE enhancement mode is asserted one of three large international 4G standards by International Telecommunication Union.Similar with 2G, 3G communication system, there is the problem of the complex-terrain signal blind zones such as market place builet below the ground, subway, tunnel and the network coverage of weak district and extension equally in LTE system, before relaying technique formation standard evolution is got up, important effect will be played in repeater in LTE system.
In TD-LTE system, uplink signal and down link signal are in same frequency, distinguish uplink/downlink by time-multiplexed mode, and the radio channel resource that uplink and downlink signals takies can by the mode flexible configuration of adjustment uplink and downlink timeslot proportioning.Therefore, TD-LTE repeater needs to obtain position of conversion point information, and the up-downgoing completing radio frequency channel switches, and namely realizes synchronous accurately.Uplink downlink switches the accurate transmission and reception that can ensure uplink and downlink signals accurately.
The conventional method of synchronization mainly contains three kinds: envelope detection, GPS location, solution frame synchronization.GPS location cost is high, is subject to weather effect, separates the parsing completely that frame synchronization need realize information, and realize complicated, cost is high, and envelope detection mode realizes simply compared with both, and cost compare is low, but its precision of mode of general envelope detection is difficult to be guaranteed.
Summary of the invention
Based on this, be necessary to realize complicated, the high problem that maybe cannot ensure synchronization accuracy of cost for the general TD-LTE repeater signal method of synchronization, provide a kind of and realize simple, with low cost and the TD-LTE detection synchronizing method and system of synchronization accuracy can be guaranteed.
A kind of TD-LTE detection synchronizing method, comprises step:
Counting TD-LTE signal hollow subframe time length;
When described empty frame time span exceed in described TD-LTE signal protect interval, ascending pilot frequency and sub-frame of uplink three time span sum time, by uplink handover to down link;
The time span of counting from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, by downlink handover to up link.
A kind of TD-LTE detection synchronizing system, is characterized in that, comprising:
Empty frame counting module, for counting TD-LTE signal hollow subframe time length;
Downstream switch module, for exceed in described TD-LTE signal when described empty frame time span protect interval, ascending pilot frequency and sub-frame of uplink three time span sum time, by uplink handover to down link;
Upstream switch module, for counting the time span from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, by downlink handover to up link.
TD-LTE detection synchronizing method and system of the present invention, interval is protected by detecting in TD-LTE signal, the length of ascending pilot frequency and sub-frame of uplink realizes being up to descending switching, by detecting descending sub frame and downlink pilot time length, determine the position protecting interval in special subframe, determine the switching point of downstream-to-upstream, whole up being switched to descending and is descendingly switched to up time point completely for TD-LTE signal frame structure feature, thus on realizing, down link accurately switches, the realization of whole handoff procedure only need can complete process by programmable logic device in addition, without the need to other hardware, realize simple, so TD-LTE detection synchronizing method of the present invention is that a kind of realization is simple, realize with low cost and the TD-LTE detection synchronizing method of synchronization accuracy can be guaranteed.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of TD-LTE detection synchronizing method of the present invention first embodiment;
Fig. 2 is the schematic flow sheet of TD-LTE detection synchronizing method of the present invention second embodiment;
Fig. 3 is the schematic flow sheet of TD-LTE detection synchronizing method of the present invention 3rd embodiment;
Fig. 4 is TD-LTE signal proportioning is 2:2 frame structure schematic diagram;
Fig. 5 is TD-LTE signal proportioning is 3:1 frame structure schematic diagram;
Fig. 6 is the structural representation of TD-LTE detection synchronizing system of the present invention first embodiment;
Fig. 7 is the structural representation of TD-LTE detection synchronizing system of the present invention second embodiment.
Embodiment
TD-LTE detection synchronizing method and system of the present invention, realized the switching of uplink downlink ascending-descending subframes by judgement two switching points for LTE signal frame structure feature, descending being switched to uply protects the position at interval to realize the switching of downstream-to-upstream by finding in special time slot, up be switched to descending by determining descending sub frame first OFDM(Orthogonal Frequency Division Multiplexing, OFDM) symbol cyclic prefix position realize be up to descending switching, wherein the determination of Cyclic Prefix position needs determining under the prerequisite protecting interval location, determined by clock CLOCK according to LTE signal frame structure feature.Compared with existing TD-LTE synchronous method, utilize detection synchronizing method can realize the switching of up-downgoing under the prerequisite ensureing certain precision, and implementation method is simple, cost compare is low.
In following execution mode, the first threshold value and the second threshold value are the empirical data value that experimental test obtains.
In order to make object of the present invention, technical scheme and advantage clearly understand, below with reference to the accompanying drawings and embodiment, the present invention is further elaborated.Should be appreciated that concrete enforcement described herein is only in order to explain the present invention, does not limit the present invention.
As shown in Figure 1, a kind of TD-LTE detection synchronizing method, comprises step:
S200: counting TD-LTE signal hollow subframe time length;
S400: when described empty frame time span exceed in described TD-LTE signal protect interval, ascending pilot frequency and sub-frame of uplink three time span sum time, by uplink handover to down link;
S600: count the time span from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, by downlink handover to up link.
TD-LTE detection synchronizing method of the present invention, interval is protected by detecting in TD-LTE signal, the time span of ascending pilot frequency and sub-frame of uplink realizes being up to descending switching, by detecting descending sub frame and downlink pilot time length, determine the position protecting interval in special subframe, determine the switching point of downstream-to-upstream, whole up being switched to descending and is descendingly switched to up time point completely for TD-LTE signal frame structure feature, thus on realizing, down link accurately switches, the realization of whole handoff procedure only need can complete process by programmable logic device in addition, without the need to other hardware, realize simple, so TD-LTE detection synchronizing method of the present invention is that a kind of realization is simple, realize with low cost and the TD-LTE detection synchronizing method of synchronization accuracy can be guaranteed.
As shown in Figure 2, wherein in an embodiment, before described step S200 also in steps
S100: TD-LTE signal is carried out to the performance number statistics in section zone time, judge whether the performance number of described TD-LTE signal in described zone time section is greater than the first threshold value, if be greater than, then start TD-LTE signal demodulator synchronously to detect, if be not more than, then provide the alarm of TD-LTE signal step-out.
In the present embodiment, described section zone time refers to a period of time, such as 8 milliseconds, 10 milliseconds, 12 milliseconds, and preferred is all generally choose the power in statistics TD-LTE signal 10 milliseconds.By judging whether power statistic value is greater than the unlatching that the first threshold value triggers detection synchronizing.If performance number is not more than the first threshold value, then think the countless certificate of downgoing baseband link, provide the alarm of TD-LTE step-out, RF switch is got to descending always; If performance number is greater than the first threshold value, open TD-LTE detection synchronizing.
As shown in Figure 3, wherein in an embodiment, described step S200 specifically comprises step:
S220: search window is stablized to TD-LTE signal setting, slide described stable search window, adds up the performance number of described stable search window;
S240: empty frame counter is set, when described stable search window performance number is less than the second threshold value, described empty frame counter, from increasing 1, counts described empty frame time span, when described stable search window performance number is not less than described second threshold value, described empty frame counter resets resets.
As shown in Figure 3, wherein in an embodiment, described step S400 specifically comprises:
S420: search window is stablized to TD-LTE signal setting, when described empty frame time span reach described protection interval, ascending pilot frequency and sub-frame of uplink three time span sum time, slide described stable search window, adds up the performance number of described stable search window;
S440: judge whether the performance number of described stable search window is greater than the second threshold value, if be greater than, then by described TD-LTE uplink handover to down link, if be not more than, then continue slide described stable search window, continue search.
According to Fig. 4, when matching well as 2:2 with TD-LTE signal, uplink handover will be explained in detail the principle and its beneficial effect that illustrate and in above-mentioned two embodiments, perform step to this specific embodiment of down link below.
Protection interval in special subframe and ascending pilot frequency power in downgoing baseband signal is empty, and two continuous print sub-frame of uplink power are empty simultaneously, and time span is fixed as 2285.4167us.Be distributed with reference signal R according to each time slot of agreement regulation descending sub frame first OFDM symbol, even if do not have user data, each time slot of descending sub frame first OFDM symbol has power to exist.Like this, be between empty sub-frame of uplink and the Cyclic Prefix of power not for first OFDM symbol of empty descending sub frame at power, descending switching point can be determined.A time counter can be designed according to this feature, think when the time span that power is sky reaches 2285.4167us and have found descending switching point position, first the stable search window Ts=0.478s that certain window is long is set, sliding stability search window, when power is less than the second threshold value, empty frame counter is from increasing 1, otherwise counter resets is searched for again.When empty frame counter reaches 2285416.7/48, if continue search search window power to be greater than the second threshold value, think and have found descending switching point, first OFDM symbol of corresponding descending sub frame, if search window performance number is not more than the second threshold value continue search, if performance number is greater than the second threshold value, then jump to initial downlink switching point state.
As shown in Figure 3, wherein in an embodiment, described step S600 specifically comprises:
S620: descending sub frame and descending pilot frequency OFDM symbol time span in counting TD-LTE signal, when gate time reaches front 8 the OFDM symbol time spans of descending sub frame and descending pilot frequency in described TD-LTE signal, enters additional character counting;
S640: stablize search window to TD-LTE signal setting, slide described stable search window, adds up described stable search window performance number.
S660: the time span counting additional character in described TD-LTE signal, when described stable search window performance number is greater than described second threshold value and in described TD-LTE signal, the time span of additional character exceedes 2 OFDM symbol time spans after described descending pilot frequency, by downlink handover to up link.
To, according to Fig. 4, be 2:2 by TD-LTE signal proportioning below, special subframe proportioning be that this specific embodiment of 10:2:2 is explained in TD-LTE detection synchronizing method of the present invention in detail, is descendingly switched to up process and principle thereof.
Up switching is by judging to protect interval location to realize in special time slot; need in conjunction with frame structure feature during concrete enforcement; during up-downgoing proportioning 2:2, special subframe proportioning is 10:2:2; descending pilot frequency takies 10 OFDM symbol; wherein 0# symbol and 7# symbol are reference signal; 8# symbol and 9# symbol distribute Physical Downlink Shared Channel information when there being business situation, when without being empty during business situation.In other words the 0# symbol of descending pilot frequency, 1# symbol, 2# symbol, 4# symbol, 7# symbol power are height, and 3# symbol, 5# symbol, 6# symbol, 8# symbol, 9# symbol power may be high, also may be sky.Be sky for downgoing baseband signal protection interval and ascending pilot frequency power, #8 symbol and #9 symbol are empty simultaneously or simultaneously for high, according to base station, #3 symbol, #5 symbol and #6 symbol then determine whether power is for empty.In this case; no matter the searching power of design is count from #8 sign-on if being empty time window; or counting from protection interval; the time window of first state can be fixed as 2285.4167us, jumps to the arrival that the second state waits for the Cyclic Prefix of first OFDM symbol of descending sub frame after first state completes.When the second state, if #8 symbol and #9 symbol have power, then the Cyclic Prefix of first OFDM symbol can detect at once, if #8 symbol and #9 symbol power are empty, then the Cyclic Prefix of first OFDM symbol can be able to detect after 285.4167us.
Wholely descendingly be switched to up step as shown in Figure 3, descending sub frame and descending pilot frequency OFDM symbol time span in counting TD-LTE signal, when gate time length reaches front 8 the OFDM symbol time spans of descending sub frame and descending pilot frequency in described TD-LTE signal, enter additional character counting, additional character counter is set, when described stable search window performance number is greater than the second threshold value and in described additional character rolling counters forward TD-LTE signal, the time span of additional character is greater than 2 OFDM symbol length, by downlink handover to up link.
Below will according to Fig. 5, select TD-LTE signal proportioning to be this specific embodiment of the 3:1 frame structure process of complete detailed explanation TD-LTE detection synchronizing of the present invention method and principle thereof again.
Uplink handover is to down link: when TD-LTE signal proportioning is 3:1, and under proportioning, empty frame time span is GP+UpPTS+U, thinks and have found descending switching point position when the time span being therefore sky at power reaches 1462.7us.First arrange the stable search window Ts=0.48us that certain window is long, sliding stability search window, when power is less than threshold value, empty frame counter is from increasing 1, otherwise counter resets is searched for again.When empty frame counter reaches 1462.7/48, if continue search search window power to be greater than threshold value, think and have found descending switching point, first OFDM symbol of corresponding descending sub frame, if search window performance number is not more than threshold value continue search; If performance number is greater than threshold value, by TD-LTE signal from uplink handover to down link.
Downlink handover is to up link: when TD-LTE uplink and downlink of signals proportioning is 3:1, special subframe proportioning is 3:9:2, now first three OFDM symbol of DwPTS all contains signal, therefore after completing steps S400 is up to the judgement of descending switching position, setup times counter, be have found GP position, by TD-LTE signal rows link switching to up link when time counter time reaches DDD+DwPTS time span.
As shown in Figure 6, a kind of TD-LTE detection synchronizing system, comprising:
Empty frame counting module 200, for counting TD-LTE signal hollow subframe time length;
Downstream switch module 400, for exceed in described TD-LTE signal when described empty frame time span protect interval, ascending pilot frequency and sub-frame of uplink three time span sum time, by described TD-LTE uplink handover to down link;
Upstream switch module 600, for counting the time span from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, by downlink handover to up link.
TD-LTE detection synchronizing system of the present invention, interval is protected by detecting in TD-LTE signal, the length of ascending pilot frequency and sub-frame of uplink realizes being up to descending switching, by detecting descending sub frame and downlink pilot time length, determine the position protecting interval in special subframe, determine the switching point of downstream-to-upstream, whole up being switched to descending and is descendingly switched to up time point completely for TD-LTE signal frame structure feature, thus on realizing, down link accurately switches, the realization of whole handoff procedure only need can complete process by programmable logic device in addition, without the need to other hardware, realize simple, so TD-LTE detection synchronizing system of the present invention is that a kind of realization is simple, realize with low cost and the TD-LTE detection synchronizing system of synchronization accuracy can be guaranteed.
As shown in Figure 7, wherein in an embodiment, described TD-LTE detection synchronizing system also comprises:
Detection synchronizing starts discrimination module 100, for carrying out the performance number statistics in section zone time to TD-LTE signal, judge whether the performance number of described TD-LTE signal in described zone time section is greater than the first threshold value, if be greater than, then start TD-LTE signal demodulator synchronously to detect, if be not more than described first threshold value, then provide the alarm of TD-LTE signal step-out.
As shown in Figure 7, wherein in an embodiment, described empty frame counting module 200 specifically comprises:
Stablize search window power statistic unit 220, for stablizing search window to TD-LTE signal setting, slide described stable search window, adds up the performance number of described stable search window;
Empty frame counting judging unit 240, for arranging empty frame counter, when described stable search window performance number is less than the second threshold value, described empty frame counter is from increasing 1, count described empty frame time span, when described stable search window performance number is not less than described second threshold value, described empty frame counter resets resets.
As shown in Figure 7, wherein in an embodiment, described downstream switch module 400 specifically comprises:
Empty frame time length determination unit 420, for stablizing search window to TD-LTE signal setting, when described empty frame time span reach described protection interval, ascending pilot frequency and sub-frame of uplink three time span sum time, slide described stable search window, adds up the performance number of described stable search window;
Descending switching judging unit 440, for judging whether the performance number of described stable search window is greater than the second threshold value, if be greater than, then by described TD-LTE uplink handover to down link, if be not more than, then continue slide described stable search window, continue search.
As shown in Figure 7, wherein in an embodiment, described upstream switch module 600 specifically comprises:
Additional character counting preparatory unit 620, for counting descending sub frame and descending pilot frequency OFDM symbol time span in TD-LTE signal, when gate time reaches front 8 the OFDM symbol time spans of descending sub frame and descending pilot frequency in described TD-LTE signal, enter additional character counting;
Performance number statistic unit 640, for stablizing search window to TD-LTE signal setting, slide described stable search window, adds up described stable search window performance number;
Uplink handover unit 660, for counting the time span of additional character in described TD-LTE signal, when described stable search window performance number is greater than described second threshold value and in described TD-LTE signal, the time span of additional character exceedes 2 OFDM symbol time spans after described descending pilot frequency, by downlink handover to up link.
The above embodiment only have expressed several execution mode 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.
Claims (8)
1. a TD-LTE detection synchronizing method, is characterized in that, comprises step:
Counting TD-LTE signal hollow subframe time length;
Search window is stablized to TD-LTE signal setting, when described empty frame time span reach protection interval, ascending pilot frequency and sub-frame of uplink three time span sum time, slide described stable search window, adds up the performance number of described stable search window;
Judge whether the performance number of described stable search window is greater than the second threshold value, if be greater than, then by described TD-LTE uplink handover to down link, if be not more than, then continue slide described stable search window, continue search;
The time span of counting from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, by downlink handover to up link.
2. TD-LTE detection synchronizing method according to claim 1, is characterized in that, before described step counting TD-LTE signal hollow subframe time length also in steps:
TD-LTE signal is carried out to the performance number statistics in section zone time, judge whether the performance number of described TD-LTE signal in described zone time section is greater than the first threshold value, if be greater than, then start TD-LTE signal demodulator and synchronously detects, if be not more than, then provide the alarm of TD-LTE signal step-out.
3. TD-LTE detection synchronizing method according to claim 1 and 2, is characterized in that, described counting TD-LTE signal hollow subframe time length specifically comprises step:
Stablize search window to TD-LTE signal setting, slide described stable search window, adds up the performance number of described stable search window;
Empty frame counter is set, when described stable search window performance number is less than the second threshold value, described empty frame counter, from increasing 1, counts described empty frame time span, when described stable search window performance number is not less than described second threshold value, described empty frame counter resets resets.
4. TD-LTE detection synchronizing method according to claim 1 and 2, it is characterized in that, the time span of described step counting from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, downlink handover is specifically comprised to up link:
Descending sub frame and descending pilot frequency OFDM symbol time span in counting TD-LTE signal, when gate time reaches front 8 the OFDM symbol time spans of descending sub frame and descending pilot frequency in described TD-LTE signal, enter additional character counting;
Stablize search window to TD-LTE signal setting, slide described stable search window, adds up described stable search window performance number;
Count the time span of additional character in described TD-LTE signal, when described stable search window performance number is greater than described second threshold value and in described TD-LTE signal, the time span of additional character exceedes 2 OFDM symbol time spans after described descending pilot frequency, by downlink handover to up link.
5. a TD-LTE detection synchronizing system, is characterized in that, comprising:
Empty frame counting module, for counting TD-LTE signal hollow subframe time length;
Empty frame time length determination unit, for stablizing search window to TD-LTE signal setting, when described empty frame time span reach protection interval, ascending pilot frequency and sub-frame of uplink three time span sum time, slide described stable search window, adds up the performance number of described stable search window;
Descending switching judging unit, for judging whether the performance number of described stable search window is greater than the second threshold value, if be greater than, then by described TD-LTE uplink handover to down link, if be not more than, then continue slide described stable search window, continue search;
Upstream switch module, for counting the time span from descending switching point to uplink handover, when the described time span from descending switching point to uplink handover reaches descending pilot frequency and descending sub frame time span sum described TD-LTE signal, by downlink handover to up link.
6. TD-LTE detection synchronizing system according to claim 5, is characterized in that, also comprise:
Detection synchronizing starts discrimination module, for carrying out the performance number statistics in section zone time to TD-LTE signal, judge whether the performance number of described TD-LTE signal in described zone time section is greater than the first threshold value, if be greater than, then start TD-LTE signal demodulator synchronously to detect, if be not more than described first threshold value, then provide the alarm of TD-LTE signal step-out.
7. the TD-LTE detection synchronizing system according to claim 5 or 6, is characterized in that, described empty frame counting module specifically comprises:
Stablize search window power statistic unit, for stablizing search window to TD-LTE signal setting, slide described stable search window, adds up the performance number of described stable search window;
Empty frame counting judging unit, for arranging empty frame counter, when described stable search window performance number is less than the second threshold value, described empty frame counter is from increasing 1, count described empty frame time span, when described stable search window performance number is not less than described second threshold value, described empty frame counter resets resets.
8. the TD-LTE detection synchronizing system according to claim 5 or 6, it is characterized in that, described upstream switch module specifically comprises:
Additional character counting preparatory unit, for counting descending sub frame and descending pilot frequency OFDM symbol time span in TD-LTE signal, when gate time reaches front 8 the OFDM symbol time spans of descending sub frame and descending pilot frequency in described TD-LTE signal, enter additional character counting;
Performance number statistic unit, for stablizing search window to TD-LTE signal setting, slide described stable search window, adds up described stable search window performance number;
Uplink handover unit, for counting the time span of additional character in described TD-LTE signal, when described stable search window performance number is greater than described second threshold value and in described TD-LTE signal, the time span of additional character exceedes 2 OFDM symbol time spans after described descending pilot frequency, by downlink handover to up link.
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| EP3979755B1 (en) * | 2017-08-11 | 2024-01-31 | Telefonaktiebolaget LM Ericsson (publ) | Technique for generating rntis |
| CN113258954B (en) * | 2021-06-16 | 2021-10-01 | 南京典格通信科技有限公司 | Low-complexity TDD-LTE synchronization method and system |
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