CN101588337B - Method for optimizing time division multiplexing frame structure parameters, communication method, system and terminal - Google Patents

Abstract

The invention discloses a method for optimizing time division multiplexing frame structure parameters, which comprises the following steps: shortening the length of cyclic prefixes of orthogonal frequency division multiplexing OFDM symbols of subframes; and at the same time, adding protective guard periods GP behind time slots or the subframes, wherein the total length of the added GP is equal to the total length of the shortened CP. The invention also provides a communication method, a system and terminals. The method for optimizing time division multiplexing frame structure parameters of theinvention can reasonably configure system parameters according to usage contexts and effectively improve system performance.

Description

Optimizing time division multiplexing frame structure parameters method, communication means, system and terminal

Technical field

The present invention relates to communication technical field, relate in particular to a kind of optimizing time division multiplexing frame structure parameters method, communication means, system and terminal.

Background technology

Broadband wireless communications will become the from now on main development direction of mobile communication, and by broadband wireless communications, the user can enjoy numerous wireless mobile services such as data download at a high speed, shopping online, mobile video chat, mobile TV.

NGBW communication system LTE (Long Term Evolution, Long Term Evolution) system supports FDD (Frequency Division Duplex, frequency division multiplexing) and TDD (Time Division Duplex, time division multiplexing) dual mode.In LTE TDD system, adopt OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) technology, before the OFDM symbol, introduce cyclic prefix CP for fear of intersymbol interference, CP length is relevant with channel latency, and channel latency is larger then to need the CP length that arranges just longer; The OFDM symbol lengths is the inverse of subcarrier spacing, and subcarrier spacing is relevant with doppler spread, and namely doppler spread is larger, and the OFDM symbol lengths is shorter.And the ratio of CP length and OFDM symbol lengths has affected resource utilization ratio, and the CP relative length is less, and then resource utilization is higher.The ofdm system parameter is relevant with the channel scene, and application scenarios has determined the reasonable overhead that parameter arranges.Parameter setting for certain scene optimization is not optimum just for other scene, and a kind of parameter that consideration can all be suitable under various scenes can cause the waste of system resource.

In the LTE system, the peak performance index that usually can support according to TU (Typical Urban, typical urban) channel designs, and wherein the regulation subcarrier spacing is 15KHz, and this parameter can be supported translational speed up to 350Km/h at the 2GHz frequency; CP length is that the maximum delay 5us of 4.79us and TU channel circumstance is complementary, and the resource overhead of CP is 7.2%.For the scene that has than long time delay, CP length is 16.67us, and taking resource overhead is 25%.Provided corresponding scheme for broadcasting scenario, for the broadcast multi-broadcasting channel, considered that the channel latency time is longer, it is 32.33us that CP length is set, and in order to reduce the expense of CP, subcarrier spacing reduced by half is 7.5KHz, the OFDM symbol lengths doubles, but the CP resource overhead of this moment still is 25%.As seen, CP expense minimum among the LTE is 7.2%, no matter is to indoor or hot zones, or macrocell and Microcell.The basic characteristics of wherein said hot zones are that the multidiameter delay expansion is little, and moving velocity of terminal is very low.

The parameter of above-mentioned LTE designs for the TU channel circumstance, can obtain the preferably compromise of performance and expense in the TU channel, if but such pilot configuration will be brought hydraulic performance decline or unnecessary expense for other scene.Such as at hot zones, the frequency selectivity of wireless channel and time selectivity all can obviously descend.

Summary of the invention

In view of this, one aspect of the present invention provides a kind of optimizing time division multiplexing frame structure parameters method, to provide the frame structure parameter of optimization for different regions, improves the performance of LTE TDD communication system.

The present invention provides a kind of communication means, system and terminal on the other hand, with under the prerequisite that farthest keeps the LTE system compatibility, and optimization system frame structure parameter, the performance of raising LTE TDD communication system.

The technical scheme that the embodiment of the invention provides is as follows:

A kind of optimizing time division multiplexing frame structure parameters method comprises:

Shorten the length of cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of subframe, after time slot or subframe, increase simultaneously protection interval GP, and make the total length of GP of increase identical with the total length of the CP of shortening.

A kind of communication means comprises:

When terminal is in hot zones, adjust in the following manner the frame structure of described terminal access cell system: the length of the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of shortening subframe, after time slot or subframe, increase simultaneously protection interval GP, and make the total length of GP of increase identical with the total length of the CP of shortening;

The frame structure parameter adjustment oneself of described terminal after according to the adjustment of described access cell system transmit and receive parameter;

Described terminal is according to the sending and receiving that parameter is carried out data communication that transmits and receives after adjusting.

A kind of communication system comprises: base station and terminal,

Described base station, be used for when described terminal is in hot zones, adjust in the following manner the frame structure of described terminal access cell system: the length of the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of shortening subframe, after time slot or subframe, increase simultaneously protection interval GP, and make the total length of GP of increase identical with the total length of the CP of shortening;

Described terminal is used for the parameter that transmits and receives according to the frame structure parameter adjustment after the adjustment of described access cell system oneself, and according to the sending and receiving that parameter is carried out data communication that transmits and receives after adjusting.

A kind of terminal comprises:

Synchronous Signal Receiver Unit is for the reception master sync signal with from synchronizing signal;

Detecting unit is used for determining the frame structure parameter according to the described master sync signal of described synchronous Signal Receiver Unit reception with from the time domain side-play amount between the synchronizing signal;

Adjustment unit is used for the parameter that transmits and receives according to the definite described terminal of frame structure parameter adjustment of described detecting unit.

Can be found out by the technical scheme that the above embodiment of the invention provides, the embodiment of the invention has provided the frame structure parameter of optimizing for hot zones, and state the parameter that transmits and receives of the frame structure parameter adjustment oneself of terminal after according to access cell system adjustment, thereby finish the reception of broadcast channel, and carry out the sending and receiving of data communication according to this parameter.Utilize communication means and the system of the embodiment of the invention, can be under the prerequisite that farthest keeps the LTE system compatibility, optimization system frame structure parameter shortens feedback delay, improves the performance of LTE TDD communication system.

Description of drawings

Fig. 1 is the schematic diagram of LTE tdd frame structure in the prior art;

Fig. 2 is LTE TDD subframe structure schematic diagram among the inventive method embodiment;

Fig. 3 is the realization flow figure of the communication means of the embodiment of the invention;

Fig. 4 is the position view of synchronizing channel in frame structure in the LTE TDD system;

Fig. 5 is the theory diagram of the communication system of the embodiment of the invention;

Fig. 6 is the theory diagram of the terminal of the embodiment of the invention.

Embodiment

In order to make those skilled in the art better understand the present invention, below in conjunction with the drawings and specific embodiments method of the present invention is elaborated.

Mainly be that large bandwidth, two-forty, feedback delay are little in the user's request of hot zones; The translational speed of terminal is very low, is mainly the scenes such as fixing and nomadic; The hot zones area coverage is less, and multidiameter delay expansion is little, thereby disturbed condition is lighter mutually between two hot zones.

The optimizing time division multiplexing frame structure parameters method of the embodiment of the invention, characteristics for above-mentioned hot zones, do not change the tdd frame structure of LTE communication system, by shortening the CP length of OFDM symbol, after time slot or subframe, introduce protection interval GP, namely can increase neatly as requested the number of times that the up-downgoing in the radio frames is switched, shorten feedback delay; Further, in the situation that do not increase control signal, the different parameters that terminal detects and judgement system adopts is so that the LTE communication system can realize easily, by flexible adjustment frame structure parameter raising communication system performance.

With reference to Fig. 1, be the frame structure schematic diagram of existing LTE TDD:

LTE TDD radio frames length is 10ms, and each radio frames is made of the long field (half-frame) of two 5ms.Each field comprises subframe and 3 special time slot: DwPTS (Downlink Pilot Timeslot that 4 1ms are long; descending pilot frequency time slot), GP (protection interval) and UpPTS (uplink pilot time slot), the overall length of 3 special time slots is 1ms.Wherein, the length of special time slot is configurable, and subframe 0 and subframe 5 and DwPTS are reserved as downlink transfer forever, except broadcast channel, the idling-resource that any downlink business all can take on this DwPTS time slot or the subframe 6 transmits, such as PDSCH (Physical Downlink Shared Channel, physical down link sharing channel), PMCH (physical multicast channel, Physical Multicast Channel) etc.Each subframe lengths is 1ms, is divided into two time slots, and each slot length is 0.5ms, each time slot can be divided into again 7 OFDM symbols, and each OFDM symbol lengths is 66.67us, and a cyclic prefix CP is arranged before the OFDM symbol, length is 4.79us, shown in Fig. 2 (a).

In embodiments of the present invention, for the scene such as fixing and nomadic, by reducing the length of CP, in the situation that guarantee that LTE tdd frame structure length is constant, correspondingly, can after time slot or subframe, increase GP, and make the total length of GP of increase identical with the total length of the CP of shortening, namely keep the length of tdd frame structure constant, guarantee the flexibility of up-downgoing resource distribution with this.Particularly, the GP that increases can be placed on respectively each time slot after, and the GP length that increases behind each time slot is identical, shown in Fig. 2 (b), CP length becomes 3.125us, GP length is 11.84us; Also the GP of described increase can be concentrated be placed on each subframe after, and the GP length that increases after each subframe is identical, this moment, GP length was 22.87us, shown in Fig. 2 (c).

In existing LTE TDD system, lower/upper row switching point has two kinds of situations, and a kind of is that 5ms switches once, and a kind of is that 10ms switches once.If keep a GP behind each time slot, this configuration can keep slot length and subframe lengths and original system to be consistent, and is conducive to the compatibility of system; GP concentrated be positioned over the last of each subframe, at this moment, time slot can not align with the time slot in the original LTE tdd frame structure, but subframe can align with the subframe in the LTE tdd frame structure, length is 1ms.As seen, no matter be after the GP that will increase is placed on respectively each time slot, or with the GP that increases concentrate be placed on each subframe after, all can be so that uplink downlink resource granularity have diminished, thus be conducive to the flexible dispatching of system.

The embodiment of the invention also provides a kind of communication means, this communication means is adjustable based on the frame structure parameter of different scenes, and make terminal can according to descending synchronous signal channel know the frame structure parameter that adopts of the cell system that accesses, thereby can adjust the frame structure parameter of oneself according to this frame structure parameter, realize the operation of up-downgoing data transmit-receive.

With reference to Fig. 3, be a kind of realization flow of embodiment of the invention communication means, mainly may further comprise the steps:

Step 301; when terminal is in hot zones; adjust in the following manner the frame structure of described terminal access cell system: the length of the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of shortening subframe; after time slot or subframe, increase simultaneously protection interval GP, and make the total length of GP of increase identical with the total length of the CP of shortening.

Concrete adjustment mode has a detailed description in front, does not repeat them here.

Step 302, terminal is determined frame structure parameter after described access cell system is adjusted according to the master sync signal that receives with from the time domain side-play amount between the synchronizing signal;

Step 303, terminal is according to the parameter that transmits and receives of the frame structure parameter adjustment oneself of determining;

Step 304, terminal is according to the sending and receiving that parameter is carried out data communication that transmits and receives after adjusting.

The channel of LTE TDD communication system can be divided into synchronizing channel, broadcast channel, uplink/downlink control channel and up-downgoing shared channel.Wherein:

Synchronizing channel is used for transmitting terminal access residential quarter, carries out residential quarter selection and the most important system information of reuse adoption process, need to just can finish down-going synchronous before receiving broadcast channel, in order to correctly judge the position of broadcast channel, understands the operation of broadcasting.

Broadcast channel is used for essential information with system and sends to all users in this residential quarter, broadcast channel major concern covering performance, be that as much as possible UE can correctly receive broadcast message in the cell coverage area, broadcast message mainly comprises system bandwidth, number of transmission antennas, System Frame Number, public resource configuration information, adjacent cell information etc.

Uplink/downlink control channel is used for sending user resources and distributes, adjusts coded system and HARQ (HybridAutomatic Repeat Request, mixed automatic retransfer) relevant information etc.

The up-downgoing shared channel is the running time-frequency resource that each user's business takies.

Because terminal is before receiving descending synchronous signal channel and do not know to access the frame structure parameter of cell system, therefore in the communication means of the embodiment of the invention terminal according to the information in the descending synchronous signal channel, obtain the frame structure parameter of access cell system, and then can be according to the sending and receiving parameter of this frame structure parameter adjustment oneself, finish the reception of broadcast channel, and carry out reception and the transmission of data according to this parameter.

In above-mentionedsteps 302, terminal need to be determined frame structure parameter after described access cell system is adjusted according to the master sync signal that receives with from the time domain side-play amount between the synchronizing signal, is elaborated below with reference to the position view of synchronizing channel in frame structure in the LTE TDD shown in Figure 4 system.

In the LTE standard, stipulate, PSCH (Primary Synchronization Channel, primary synchronization channel) is placed on the 3rd symbol among the DwPTS, and SSCH (Secondary SynchronizationChannel, from synchronizing channel) be placed on last OFDM symbol of subframe #0, as shown in Figure 4.Because the difference of CP length, can cause PSCH different from side-play amount between the SSCH.Wherein, what Fig. 4 (a) represented is the situation of long CP, and CP length is 16.67us; What Fig. 4 (b) represented is the situation of common CP, and CP length is 4.7568us; What Fig. 4 (c) represented is the situation of short CP, and CP length is 3.125us, and a GP is arranged behind each time slot, and GP length is 11.84us; What Fig. 4 (d) represented is the situation of short CP, and CP length is 3.125us, but a larger GP is arranged after each subframe, and GP length is 22.87us.

Therefore can calculate respectively the time domain side-play amount between the PSCH and SSCH in above-mentioned four kinds of situations, please refer to Fig. 4, the time offset of PSCH and SSCH by between the two CP quantity and symbol quantity addition calculation out obtains each side-play amount as follows:

(a) 3 OFDM symbol+3 in PSCH and SSCH interval long CP, and the length of OFDM symbol and long CP is known, therefore obtains offset0=250us;

(b) 3 OFDM symbol+3 in PSCH and SSCH interval normal CP obtains offset1=214.59us;

(c) 3 OFDM symbol+3 in PSCH and SSCH interval normal CP+1 short GP obtains offset2=221.22us;

(d) 3 OFDM symbol+3 in PSCH and SSCH interval normal CP+1 long GP obtains offset3=233us.

By above-mentioned result of calculation as can be known, the minimum interval between four side-play amounts is 6.63us.

The below illustrates the process of judging the argument structure of current system by the time domain side-play amount between detection PSCH and the SSCH based on above-mentioned these four kinds of situations:

At first, detect the position of PSCH, the PSCH channel has 3 sequences, the possible transmitting terminal signal of PSCH that prestores by terminal carries out relevant treatment with the continuous signal take radio frames as unit (comprise data-signal in the signal of these receptions and also comprise synchronizing channel) that receives, the PSCH signal that prestores such as use calculates with the reception signal: two each element difference conjugate multiplication of sequence, again with each product addition, will with namely obtain correlation divided by sequence length, if two sequence quadratures, correlation is 0, two very large then correlations of Serial relation degree are tending towards 1, described calculating can realize by matched filter, when receiving signal by matched filter, can a higher relevant peaks occur in the position at PSCH place, thereby obtain the time-domain position of PSCH;

Then, detect the position of SSCH, the SSCH channel has 504 sequences, enterprising line correlation detects the signal of the SSCH that prestores by terminal in the position of side-play amount 0 shown in Figure 4, side-play amount 1, side-play amount 2, side-play amount 3 respectively, record each correlation on the different offset location, can obtain the side-play amount at maximum related value place, this side-play amount has been indicated system [CP, GP] parameter.

With reference to figure 4 (a)～(d), the configuration parameter correspondence of each [CP, GP] a kind of unique PSCH-SSCH side-play amount, be to concern one to one.Therefore, if known the side-play amount of PSCH-SSCH, so corresponding [CP, GP] parameter can be learnt.

Certainly, except above-mentioned detection method, according to the practical application needs, can also adopt additive method to obtain [CP, GP] parameter, the present invention also not only is confined to above-mentioned this concrete detection method.

Like this, terminal just can be adjusted according to the system frame structure parameter that detects the parameter that transmits and receives of oneself.Such as, terminal determines at first that when doing down-going synchronous the time at PSCH place is t0; Then carry out the detection of SSCH, suppose that the position of the maximum correlation peak appearance of discovery SSCH is t1, obtain both time deviation amount offset=t0-t1.Following several situation is arranged:

(1) if the time deviation amount offset that obtains is in the less neighborhood of offset0=250us, such as, offset0 ± 2us so just can judge, and system parameters is shown in Fig. 4 (a), and CP length is long CP, without increasing GP;

(2) if the time deviation amount offset that obtains is in the less neighborhood of offset1=214.59us, such as offset1 ± 2us, so just can judge, system parameters is shown in Fig. 4 (b), and CP length is common CP, without increasing GP;

(3) if the time deviation amount offset that obtains is in the less neighborhood of offset2=221.22us, such as offset2 ± 2us, so just can judge, system parameters is shown in Fig. 4 (c), short CP, CP length is 3.125us, and there is a GP each time slot back, and GP length is 11.84us;

(4) if the time deviation amount offset that obtains is in the less neighborhood of offset3=233us, such as offset3 ± 2us, so just can judge, system parameters is shown in Fig. 4 (d), short CP, CP length is 3.125us, and there is a larger GP each subframe back, and GP length is 22.87us.

Terminal is according to the reception that parameter is finished broadcast channel that transmits and receives after adjusting, and then can carry out according to this parameter reception and the transmission of data.

As seen, utilize the communication means of the embodiment of the invention, can be according to use scenes reasonable disposition system parameters, Effective Raise systematic function.

The embodiment of the invention also provides a kind of communication system, comprise as shown in Figure 5:base station 51 andterminal 52, wherein,base station 51 is used for when described terminal is in hot zones, adjust in the following manner the frame structure of described terminal access cell system: the length of the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of shortening subframe, after time slot or subframe, increase simultaneously protection interval GP, and make the total length of GP of increase identical with the total length of the CP of shortening; The parameter that transmits and receives thatterminal 52 is used for according to the frame structure parameter adjustment after the adjustment of described access cell system oneself, and according to the sending and receiving that parameter is carried out data communication that transmits and receives after adjusting.

In this embodiment, terminal 52 comprises receivingelement 521, detectingunit 522,adjustment unit 523 and transmitting element 524.Wherein, receivingelement 521 is for the master sync signal that receivesbase station 51 transmissions with from synchronizing signal; Detectingunit 522 is used for determining the frame structure parameter according to the described master sync signal of receivingelement 521 receptions with from the time domain side-play amount between the synchronizing signal;Adjustment unit 523 is for the parameter that transmits and receives of the described terminal of frame structure parameter adjustment of determining according to detectingunit 522; Transmittingelement 524 is used for according to the transmission that parameter is carried out data communication that transmits and receives afteradjustment unit 523 adjustment.

The communication system of the embodiment of the invention, can be according to use scenes reasonable disposition system parameters, and in the situation that do not increase control signal, terminal can detect the frame structure parameter that adopts with judgement system, thereby communication system is realized easily, the Effective Raise systematic function satisfies the capacity of communication system demand.Especially for hot zones, the decline that can greatly reduce the length of CP and can not bring performance, thus the raising of getting system's other side performance in return is more flexible such as the up-downgoing resource distribution, be that more switching point is arranged in each radio frames, make the feedback delay of TDD shorter etc.

The embodiment of the invention also provides a kind of terminal, and as shown in Figure 6, this terminal mainly comprises: synchronousSignal Receiver Unit 61, detecting unit 62 and adjustment unit 63.Wherein, synchronousSignal Receiver Unit 61 is for the reception master sync signal with from synchronizing signal; Detecting unit 62 is used for determining the frame structure parameter according to the described master sync signal of synchronousSignal Receiver Unit 61 receptions with from the time domain side-play amount between the synchronizing signal;Adjustment unit 63 is for the parameter that transmits and receives of the described terminal of frame structure parameter adjustment of determining according to detecting unit 62.

In this embodiment, detecting unit 62 comprises: the time domain side-play amount determines thatsubelement 621 and frame structure parameter determine subelement 622.Wherein, the time domain side-play amount determines thatsubelement 621 is for definite described master sync signal with from the time domain side-play amount between the synchronizing signal; The frame structure parameter determines thatsubelement 622 is used for determining the frame structure parameter according to described time domain side-play amount.

Preferably, this terminal can also comprisememory cell 64, master sync signal and from synchronizing signal is used for prestoring, like this, the time domain side-play amount determines thatsubelement 621 just can be according to the comparison of the master sync signal of the master sync signal that prestores in thememory cell 64 and reception, obtain the time-domain position of primary synchronization channel, and according to the comparison from synchronizing signal from synchronizing signal and reception that prestores, obtain the time-domain position from synchronizing channel; And then calculate primary synchronization channel and side-play amount from synchronizing channel according to primary synchronization channel and from the time-domain position of synchronizing channel.

The terminal of the embodiment of the invention can be in the situation that do not increase control signal, can detect and differentiate the frame structure parameter that the cell system that will access adopts, thereby communication system can be realized easily.

It will be appreciated by those skilled in the art that, unit and the step of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.

The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in RAM, internal memory, ROM, electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.

To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Above-described embodiment of the present invention does not consist of the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.

Claims (8)

1. an optimizing time division multiplexing frame structure parameters method is characterized in that, comprising:

When being in hot zones; shorten the length of the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of subframe in the Long Term Evolution time division multiplexing radio frames; increase protection interval GP after the time slot that in subframe, comprises simultaneously or the subframe, and make the total length of GP of increase identical with the total length of the CP of shortening.

2. method according to claim 1 is characterized in that:

After the GP of described increase is placed on respectively each time slot, and the GP length that increases behind each time slot is identical.

3. method according to claim 1 is characterized in that:

With the GP of described increase concentrate be placed on each subframe after, and the GP length that increases after each subframe is identical.

4. a communication means is characterized in that, comprising:

When terminal is in hot zones, adjust in the following manner the frame structure of described terminal access cell system: the length that shortens the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of subframe in the Long Term Evolution time division multiplexing radio frames, increase protection interval GP after the time slot that in subframe, comprises simultaneously or the subframe, and make the total length of GP of increase identical with the total length of the CP of shortening;

The frame structure parameter adjustment oneself of described terminal after according to the adjustment of described access cell system transmit and receive parameter;

Described terminal is according to the sending and receiving that parameter is carried out data communication that transmits and receives after adjusting.

5. method according to claim 4 is characterized in that, the parameter that transmits and receives of the frame structure parameter adjustment oneself of described terminal after according to the adjustment of described access cell system comprises:

Described terminal is determined frame structure parameter after described access cell system is adjusted according to the master sync signal that receives with from the time domain side-play amount between the synchronizing signal;

The frame structure parameter adjustment oneself after according to the described access cell system adjustment of determining of described terminal transmit and receive parameter.

6. method according to claim 5 is characterized in that, described terminal determines that according to the master sync signal that receives with from the time domain side-play amount between the synchronizing signal frame structure parameter after the adjustment of described access cell system comprises:

By the master sync signal that relatively prestores and the master sync signal of reception, obtain the time-domain position of primary synchronization channel;

By relatively prestore from synchronizing signal and reception from synchronizing signal, obtain the time-domain position from synchronizing channel;

Calculate primary synchronization channel and side-play amount from synchronizing channel according to primary synchronization channel and from the time-domain position of synchronizing channel;

Determine CP after described access cell system is adjusted and position and the length of GP according to described side-play amount.

7. a communication system is characterized in that, comprising: base station and terminal,

Described base station, be used for when described terminal is in hot zones, adjust in the following manner the frame structure of described terminal access cell system: the length that shortens the cyclic prefix CP of the orthogonal frequency division multiplex OFDM symbol of subframe in the Long Term Evolution time division multiplexing radio frames, increase protection interval GP after the time slot that in subframe, comprises simultaneously or the subframe, and make the total length of GP of increase identical with the total length of the CP of shortening;

Described terminal is used for the parameter that transmits and receives according to the frame structure parameter adjustment after the adjustment of described access cell system oneself, and according to the sending and receiving that parameter is carried out data communication that transmits and receives after adjusting.

8. system according to claim 7 is characterized in that, described terminal comprises:

Receiving element is for the reception master sync signal with from synchronizing signal;

Detecting unit is used for the described master sync signal that receives according to described receiving element and determines frame structure parameter after described access cell system is adjusted from the time domain side-play amount between the synchronizing signal;

Adjustment unit is used for the parameter that transmits and receives according to the described terminal of frame structure parameter adjustment after the definite described access cell system adjustment of described detecting unit;

Transmitting element is used for carrying out according to the emission parameter after the described adjustment unit adjustment transmission of data communication.

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