CN1452420A - Radio communication method based on time division diplexing - Google Patents

Abstract

The invention discloses a wireless communication method based on time division duplexing. The method firstly allocates a time period for data uplink transmission and downlink transmission within a time frame of the air interface, and allocates uplink synchronization within the time period of uplink transmission. Time slots, control time slots and allocate uplink business time slots according to the uplink traffic volume; in the time period of downlink transmission, allocate downlink synchronization time slots, control time slots and business time slots, and set the downlink control time slots before the downlink business time slots , allocate an uplink time slot between the downlink control time slot and the downlink service time slot; the base station allocates different service time slots to different users, and optimizes the time slots allocated to different users in each time frame, and the user receives The device receives and processes the optimization parameters, and then receives corresponding service data in the subsequent downlink service time slots. Using the above solution for wireless communication can increase system throughput and spectrum efficiency, and reduce operating costs.

Description

A wireless communication method based on time division duplex

technical field

The present invention relates to a communication method in a wireless communication system, in particular to a communication method based on a time division duplex wireless communication system.

Background technique

In a traditional wireless communication system, a base station provides services for different users through different multiple access schemes, the most commonly used are frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple access (CDMA) technologies . In the current TDD standard system of the third-generation wireless communication, for example, in the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, the subframe time slot structure as shown in Figure 2 is specified. In Figure 2, except for the Three special time slots for synchronization: downlink pilot time slot (DwPTS), guard period (GP, Guard Period), uplink pilot time slot (UpPTS), and the remaining 7 business time slots are fixed at 0.675ms long. Wherein, the first time slot (TS0) is always allocated for downlink, and the second time slot (TS1) is always allocated for uplink. In addition to the first uplink and downlink switching point located at the GP, there is also a second unfixed uplink and downlink switching point in order to achieve flexible uplink and downlink ratio settings and support symmetrical and asymmetrical uplink and downlink services. In Fig. 2, the second uplink and downlink switching point is set between the third time slot (TS2) and the fourth time slot (TS3), so it can support asymmetric services with a ratio of uplink and downlink of 2:5. In each time slot of the TD-SCDMA system, multiple users are supported to transmit and receive in parallel using CDMA technology.

In the third-generation wireless communication system, data services will surpass voice services and take a dominant position. There are two essential differences between data services and voice services: data services may be asymmetrical, such as Internet browsing services; in addition, data services have less stringent requirements on delay time than voice services. Therefore, for the data service, the wireless communication system can adopt multiple technologies to improve the communication capacity of the system, such as Turbo coding technology and the like. The mobile users in the wireless communication system may be distributed in different places in the cell, and the distance between the users and the base station is different. Due to the characteristics of the wireless fading channel, the highest data transmission rate that different users can normally receive in a cell is also different. Usually, on the premise of meeting the required transmission bit error rate, the maximum data transmission rate that most users can achieve is basically the same. In addition, some users have good channel conditions, so they can achieve a high data transmission rate; while other users have relatively bad channel conditions, so the data transmission rate that can be achieved is also relatively low. The capacity can be obviously improved by reducing the waiting time of high-speed communication users, but there may be a limitation of the ratio of the maximum waiting time to the minimum waiting time in practice.

Based on the above analysis, the existing transmission method using the service time slot structure of equal time length is more suitable for voice services with high real-time requirements; but for data services, it cannot make good use of data services. The delay time can be longer to realize the optimization of spectrum resources. In addition, in the current transmission method, each time slot has an independent structure, and each time slot is provided with a separate pilot frequency. This structure is not suitable for the realization of high-speed data services. First of all, for mobile users who are still or moving at low speed, since high-speed data transmission needs to allocate more time resources to realize, in such a subframe, multiple time slots must be allocated to high-speed data service customers at the same time; Since the pilot frequency of each time slot cannot be released for service data transmission, time resources are wasted substantially, which is not conducive to the realization of high-speed data transmission. For high-speed moving customers, using intermediate pilots for channel estimation may cause the user to fail to receive data normally when the user is moving at high speed.

Contents of the invention

The purpose of the present invention is to provide an efficient wireless communication method based on time-division duplexing, which can realize the optimization of system frequency spectrum resources and reduce the waste of time resources.

In order to achieve the above object, the wireless communication method based on time division duplex provided by the present invention includes:

(1) Allocate a time period for data uplink transmission and downlink transmission within a time frame of the air interface;

(2) During the time period of uplink transmission, allocate uplink synchronization time slots for realizing uplink synchronization, uplink control time slots for transmitting uplink signaling, and allocate uplink business time slots for transmitting data services according to the uplink business volume ;

(3) During the time period of downlink transmission, allocate downlink synchronization time slots for downlink synchronization, downlink control time slots for transmission of downlink signaling, and multiple downlink business time slots for transmission of data services. The control time slot is set before the downlink business time slot, and an uplink time slot is allocated between the downlink control time slot and the downlink business time slot;

(4) The base station allocates different service time slots to different users, and in each time frame, according to the user's wireless propagation channel conditions and the services provided for the user, executes a scheduling algorithm to optimize the time slots allocated to different users , and send the scheduling result and transmission parameters to the user receiving equipment in the downlink control time slot, the user receiving equipment receives and processes the transmission parameters in the uplink time slot described in step (3), and then in the subsequent downlink business The corresponding service data is received in the time slot.

The uplink synchronization time slots, uplink control time slots and uplink service time slots in step (2) do not overlap each other in time; the downlink synchronization time slots, downlink control time slots and downlink service time slots in step (3) in time do not overlap each other.

The number of uplink synchronization time slots in step (2) is allocated according to the user's moving speed or synchronization realization accuracy requirements. If there are multiple uplink synchronization time slots, the multiple uplink synchronization time slots are distributed according to equal time intervals set up.

The number of downlink synchronization time slots described in step (3) is allocated according to the mobile speed of the user or the synchronization realization accuracy requirement, if the number of downlink synchronization time slots is multiple, then the multiple downlink synchronization time slots are distributed according to equal time intervals set up.

In step (2), allocating uplink control time slots for transmitting uplink signaling means allocating more than one uplink control time slots, and part of the uplink control time slots is used to transmit low-speed data services.

In step (3), allocating downlink control time slots for transmitting downlink signaling means allocating more than one downlink control time slots, and part of the downlink control time slots is used to transmit low-speed data services.

The time length of the downlink service time slot in step (3) is based on the distribution of the highest data transmission rate that can be realized by the user or the service allocation provided, and the above-mentioned allocated service is the agreed service quality or service type.

The method also includes:

The pilot signal is transmitted in each downlink service time slot to realize channel estimation.

The channel estimation is realized by allocating a fixed spreading code in the whole time slot to transmit the pilot signal.

The transmitting pilot signal is a pilot signal using a fixed symbol for transmission.

The transmitting pilot signal is transmitting a pilot signal using an agreed symbol sequence.

The method further includes: transmitting pilot signals which are independent from the transmission of downlink service time slots between different downlink service time slots to perform channel estimation.

The method also includes:

The sequence of uplink and downlink transmission within a time frame is downlink transmission, uplink transmission, and downlink service time slot transmission; the uplink transmission time slot is allocated as short as possible on the basis of meeting the basic conditions for downlink signaling reception. The basic conditions for receiving the downlink signaling include that the receiving device can obtain the transmission format information of a high-speed data transmission process in time.

Step (3) allocates an uplink time slot between the downlink control time slot and the downlink business time slot, in order to allocate a time length for all user equipments to realize the uplink time of a transmission parameter or a transmission parameter set estimation required for the shortest time Gap.

Allocating an uplink time slot between the downlink control time slot and the downlink service time slot described in step (3) may also be a time length for all user equipments to realize a transmission parameter or a transmission parameter set estimation, and to complete the uplink signal The uplink time slot with the shortest time required for transmission.

Allocating an uplink time slot between the downlink control time slot and the downlink service time slot described in step (3), can also realize a transmission parameter or a transmission parameter set estimation for all user equipments for allocating a time length, and complete the uplink signal order transmission, and the shortest uplink time slot required to complete the uplink business transmission.

It can be known from the above that the present invention adopts time division duplexing as the duplexing mode of the air interface. The spectrum of TDD only needs one frequency band, and its uplink and downlink ratio can be flexibly configured through the uplink and downlink switching points, so it can more effectively support asymmetric data services such as Internet browsing.

In terms of time slot arrangement, the present invention configures control time slots and service time slots to transmit signaling signals and service data signals respectively. Since the signaling needs to ensure that the control information can be sent to the receiver in time, the signaling transmission has higher real-time requirements than the service data transmission, so technologies such as power control need to be used. Simultaneous transmission of signaling and data will affect each other's efficiency, thereby reducing system capacity. Therefore, the present invention adopts a manner of separating signaling transmission from data service transmission, which can effectively improve transmission efficiency in a wireless fading environment.

In the present invention, there are multiple downlink service time slots. For the traditional second-generation mobile communication system with voice as the main service, due to the real-time requirements of the voice service and the relatively stable traffic characteristics of the service, whether it is a downlink or an uplink time slot, it is generally designed that each time slot equal in length. The present invention considers the optimization of the air interface of the wireless system for asymmetric data services, according to the characteristics of business burst and non-real-time, and the different channel conditions of users at different locations in the cell, from improving channel coding efficiency, improving From the perspective of system capacity, configure each downlink service time slot to occupy a unequal time period, and allocate longer service time slots to users with good channel conditions or high service quality requirements, or further allocate multiple time slots At the same time, business data is transmitted to meet the needs of different businesses. In terms of service time slot allocation, the method adopts TDMA to optimize the data service, and each service time slot can only be allocated to one user. The allocation of uplink service time slots can refer to the allocation method of downlink service time slots, or the uplink service can be combined into the uplink control time slot for transmission according to the actual business conditions, so that the uplink service time slot resources can also be allocated for the transmission of downlink services , to meet the requirements of different uplink and downlink ratio allocations.

For the configuration of high-speed mobile users or long time frames, the present invention adopts the method of allocating multiple synchronization time slots and multiple control time slots to ensure the smooth access of high-speed users, the maintenance of synchronization and the timely sending of control signaling. In terms of pilot sequence design, in the existing TD-SCDMA system, each downlink service time slot has its own independent mid-pilot code, which is used to complete the channel estimation of the service channel. This setting is more beneficial for users who have multiple code division multiplexing in one time slot. Considering the characteristics of data service transmission, a single user may need to allocate multiple such time slots of equal length to transmit data services. For this reason, the optimization method of the present invention is: in the low-speed mobile situation, adopted one or more independent public pilot periods, the transmission of the pilot frequency is separated from the scheduling of the data service, thereby can avoid being used for the resource that the pilot frequency transmits waste. In addition, in the case of multiple common pilot transmissions, a single traffic slot can also utilize adjacent multiple common pilots to perform more accurate channel estimation. In the case of high-speed movement, the present invention adopts the method of continuous pilot transmission, avoiding the use of intermediate pilots, because the channel corresponding to part of the service data can only be obtained through indirect channel estimation methods, resulting in frequent reception failures . Common pilots and continuous pilots can be designed to be transmitted using the same symbol in the entire time slot, or can be designed as fixed random symbols to reduce the interference between continuous pilots of different cells.

Time-division duplex technology is used to realize uplink and downlink transmission and reception respectively by dividing different time periods. Therefore, the base station cannot receive any user's uplink transmission signal when performing downlink data transmission. Allocating a single downlink control time slot for a user to transmit downlink control signaling will inevitably lead to waste of resources. The present invention adopts CDMA technology to simultaneously transmit control signaling to multiple users in the same control time slot, so as to prevent the occurrence of the above-mentioned waste of resources. As mentioned above, this method uses TDMA technology to allocate service time slots for different users to transmit data services, and transmits control signaling to multiple users at the same time so that the time interval between the service time slots of some users and the corresponding control time slots becomes longer, which will affect the accuracy of channel measurement, and thus affect the performance of signal reception. Since the receiving party needs to carry out some preparatory work after the transmitting party notifies the receiving party to prepare to receive, the present invention adopts the method of arranging the uplink control time slot between the downlink control time slot and the downlink business time slot to ensure that the receiver has enough time While preparing to receive, it can also make full use of time resources for signal transmission. The design principle of the uplink control time slot is to shorten the time interval between downlink channel measurement and downlink service data transmission as much as possible on the premise of meeting the time requirements for downlink reception preparation as much as possible, so as to improve the efficiency of data transmission.

It can be seen from the above that, compared with the existing communication methods mainly optimized for voice services, the method of the present invention can improve the system throughput and spectral efficiency, and reduce operating costs.

Description of drawings

Fig. 1 is the embodiment flowchart of the inventive method;

Fig. 2 is a time frame structural diagram adopted in the embodiment described in Fig. 1;

Fig. 3 is a structural diagram of a time frame adopted by another embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is the flow chart of the embodiment of the method of the present invention. The present invention first divides the data structure in the data transmission time frame, and then utilizes the data structure to transmit service data. Specifically, in step 1, a time period for uplink transmission and downlink transmission of data is allocated within a time frame of the air interface; the purpose of this step is to realize uplink and downlink transmission according to the characteristics of uplink and downlink services according to the actual business data transmission. Downlink scale setting. Since synchronization and other controls are required during the uplink and downlink transmission of service data, step 2 allocates an uplink synchronization time slot for realizing uplink synchronization and an uplink control time slot for transmitting uplink signaling during the time period of uplink transmission , allocate uplink service time slots for transmitting data services according to the uplink traffic volume. In practice, if the uplink traffic volume is very small due to serious uplink and downlink asymmetry, the uplink traffic and signaling can be transmitted in the same period of time. Internally through code division multiplexing, at this time, the uplink business time slot may not be allocated. In this example, the uplink synchronization time slots, uplink control time slots and uplink service time slots do not overlap with each other in time; In practice, multiple synchronization time slots can be allocated to achieve synchronization. If there are multiple uplink synchronization time slots, the multiple uplink synchronization time slots are distributed at equal time intervals as much as possible. Principle distribution setting, of course, the "equal time interval" mentioned here is not accurate, it means that the time interval is roughly equal; the uplink control time slot allocated for transmission of uplink signaling is to allocate an uplink control time slot Multiple time slots can also be allocated. In this example, the uplink control time slot is used to transmit part of the low-speed data service, and of course it can also be used.

Step 3: During the time period of downlink transmission, allocate a downlink synchronization time slot for realizing downlink synchronization, a downlink control time slot for transmitting downlink signaling, and a plurality of downlink service time slots for transmitting data services, the Downlink synchronization time slots, downlink control time slots, and downlink service time slots do not overlap each other in time. The number of the downlink synchronization time slots is allocated according to the user's moving speed or synchronization realization accuracy requirements. According to the specific situation, one or multiple downlink synchronization time slots can be allocated for realizing downlink synchronization. In this example, one is allocated, if If the number of downlink synchronization time slots is multiple, then the multiple downlink synchronization time slots are distributed and set in time according to the principle of equal time interval distribution as much as possible. Of course, the "equal time interval" mentioned here is not accurate, it is Refers to approximately equal time intervals. The downlink control time slot allocated for transmission of downlink signaling is to allocate one downlink control time slot. In practice, multiple downlink control time slots can also be allocated. In this example, the downlink control time slot is used to transmit some low-speed data services. can also be used. The time length of the downlink service time slot is based on the distribution of the highest data transmission rate that can be realized by the user or the service allocation provided. The above-mentioned allocated service is the agreed service quality or service type, and the downlink service allocated according to this allocation principle The time slot lengths of service times may be equal, for example, for voice services, and the time lengths of downlink service time slots may also be unequal, for example, for high-speed data services. In step 3, the downlink control time slot is set before the downlink service time slot, and an uplink time slot is allocated between the downlink control time slot and the downlink service time slot. The allocation of an uplink time slot between the downlink control time slot and the downlink service time slot is to allocate an uplink time slot with a time length for all user equipments to realize a transmission parameter or a transmission parameter set estimation of the shortest time required; it can also be To allocate a time length for all user equipment to realize a transmission parameter or a transmission parameter set estimation, and to complete the uplink time slot of the shortest time required for signaling transmission; it is also possible to allocate a time length for all user equipment to implement a transmission parameter or a transmission parameter set estimation, and complete the uplink signaling transmission and the shortest uplink time slot required to complete the uplink service transmission.

The sequence of the above-mentioned uplink and downlink transmission within a time frame is downlink transmission, uplink transmission, and downlink service time slot transmission; the uplink transmission time slot is assigned as short a time period as possible on the basis of meeting the basic conditions for receiving downlink signaling The basic conditions for receiving the downlink signaling include that the receiving device can obtain the transmission format information of a high-speed data transmission process in time.

In step 4, the base station allocates different service time slots to different users, and assigns different numbers of downlink service time slots to different users according to the wireless propagation channel conditions of the users and the service conditions provided for the users during the specific allocation. It is also possible to allocate different time lengths or different numbers of downlink service time slots to different users, wherein the service conditions provided to users can be the agreed service quality or the type of service provided. At the same time, in each time frame, according to the user's wireless propagation channel conditions and the services provided for the user, the scheduling algorithm is executed to optimize the time slots allocated to different users, and the scheduling results and The transmission parameters are sent to the user receiving equipment, and the user receiving equipment receives and processes the transmission parameters in the uplink time slot described in step 3.

Based on the above steps, when transmitting service data, the base station sends the service data to the user in step 5, and the user uses the downlink service time slot to receive the corresponding service data.

In the specific implementation of the present invention above, the channel estimation is realized in the following way: the pilot signal is transmitted in each downlink service time slot to realize the channel estimation.

It should be noted that the above channel estimation can also be realized by allocating a fixed spreading code in the entire time slot to transmit the pilot signal. The transmitting pilot signal is a pilot signal using a fixed symbol, or a pilot signal using an agreed symbol sequence.

The above channel estimation can also be implemented in this way: the channel estimation is performed by transmitting pilot signals which are independent from the transmission of downlink service time slots between different downlink service time slots.

FIG. 2 is a structural diagram of a time frame used in the embodiment shown in FIG. 1 . The time frame shown in the figure adopts the configuration of 5ms subframe of TD-SCDMA. In this time frame, no time slot for uplink service is allocated, and the transmission of uplink data service adopts CDMA technology to share the second time slot (TS1) with uplink signaling. The first time slot (TS0) is allocated as a downlink control time slot, which is dedicated to transmitting control signaling, and the synchronization time slot adopts the same setting of TD-SCDMA. There are three downlink business time slots, namely: TS2, TS3, and TS4. The three time slots are not equal in time length, so that data services can be optimized as much as possible according to the channel conditions of different users in the cell and the required service quality. In the time frame shown in Fig. 2, two downlink common pilot time slots are allocated. The pilot symbols can be fixed and different time sequences used by different cells; or the same symbols, the pilot signals of different cells are multiplied by different scrambling codes. The pilot symbol can also adopt the setting method of the middle pilot of TD-SCDMA. Assume that the basic sequence is expressed by [a ₀ , a ₁ , ..., a _P-1 ], P is the length of the sequence, and the length of the pilot transmission signal is set as M, M≥P. Then the pilot transmission signal of the first cell may be [a ₀ , a ₁ , . . . , a _p-1 , . . . , a _{M mod P} ], where mod is a remainder operation. The pilot transmission signal of the adjacent second cell can be set to [a _N , a _N+1 ,..., a _P-1 ,..., a _{M+N mod P} ], that is, the same as the first The phases of the pilot transmission signals of the cells differ by N chips. The selection rule for N is: N chip periods must be greater than twice the maximum delay spread of the cell. For example, when the two-path signals received by users in the cell differ by a maximum of 6 chip periods, the selection of N must be greater than 6× 2 = 12 chips.

Under the common pilot setting in Figure 2, the longest service time slot TS3 can simultaneously select two common pilots to provide channel estimation. The receiving device of the user assigned to TS3 can select any common pilot for channel estimation according to the capability of the device; it can also average the channel estimates obtained by calculating the two common pilots as the channel estimation for signal reception; it can also use The two channel estimation results are used as the channel estimation of the service data in the first half and the second half respectively; the indirect estimated value of the channel corresponding to the service data can also be obtained by interpolation calculation and other methods according to the two channel estimation results. The adoption of the above method can provide signal reception with different performances for receiving devices with different computing capabilities. In the setting in Fig. 2, TS1 can use the same time length as TD-SCDMA, that is, 0.675ms, and the uplink service is also transmitted in this time slot. Under this configuration, the system can provide users with the highest rate downlink transmission service. The transmission process according to this configuration is: the user receives the measurement result of the TS1 uplink transmission channel of the user equipment; the base station executes the scheduling algorithm according to the measurement result and other known or estimated information, and allocates each service time slot; the base station sends the scheduling result and The parameters required by the user to receive are transmitted to the user at TS0 in the next time frame; the user receives the scheduling result and parameters, and receives data services. For user receiving equipment, as long as the modulation parameters of service data transmission are demodulated, the signal can be demodulated over the air; at the same time, since the transmission parameters of TS3 and TS4 have sufficient time to process, the time length setting of TS1 is only limited by The limitation on the demodulation time of the transmission parameters of TS2, that is, the time length of TS1 must be longer than the time required for demodulation of the transmission parameters of TS2. Under this limitation, users can receive service data within the second time frame reported by channel quality measurement results at the latest, and the time delay between them can be shortened as much as possible, thus effectively improving the success rate and efficiency of transmission .

Fig. 3 is a structural diagram of a time frame adopted by another embodiment of the present invention. In this embodiment, common pilots are replaced by continuous pilots. With this continuous pilot setting, technologies such as smart antennas can be applied to the transmission of each service time slot, and the channel corresponding to each service data can be obtained by direct estimation, without using interpolation under the common pilot setting, etc. The indirect estimation method is therefore conducive to providing data business services to high-speed mobile users. Consecutive pilot symbols may use the same symbol, such as a symbol with all "1".

Claims (16)

1. A wireless communication method based on time division duplexing, comprising: (1) Allocate a time period for data uplink transmission and downlink transmission within a time frame of the air interface; (2) During the time period of uplink transmission, allocate uplink synchronization time slots for realizing uplink synchronization, uplink control time slots for transmitting uplink signaling, and allocate uplink business time slots for transmitting data services according to the uplink business volume ; (3) During the time period of downlink transmission, allocate downlink synchronization time slots for downlink synchronization, downlink control time slots for transmission of downlink signaling, and multiple downlink business time slots for transmission of data services. The control time slot is set before the downlink business time slot, and an uplink time slot is allocated between the downlink control time slot and the downlink business time slot; (4) The base station allocates different service time slots to different users, and in each time frame, according to the user's wireless propagation channel conditions and the services provided for the user, executes a scheduling algorithm to optimize the time slots allocated to different users , and send the scheduling result and transmission parameters to the user receiving equipment in the downlink control time slot, the user receiving equipment receives and processes the transmission parameters in the uplink time slot described in step (3), and then in the subsequent downlink business The corresponding service data is received in the time slot. 2. The wireless communication method based on time division duplexing according to claim 1, characterized in that: the uplink synchronization time slot, uplink control time slot and uplink service time slot in step (2) do not overlap each other in time; step (3) The downlink synchronization time slots, downlink control time slots, and downlink service time slots do not overlap each other in time. 3. The wireless communication method based on time division duplexing according to claim 2, characterized in that: the number of uplink synchronization time slots in step (2) is allocated according to the user's moving speed or synchronization realization accuracy requirements, if uplink synchronization If there are multiple time slots, then the multiple uplink synchronization time slots are distributed and set at equal time intervals. 4. The wireless communication method based on time division duplexing according to claim 3, characterized in that: the number of downlink synchronization time slots in step (3) is allocated according to the user's moving speed or synchronization realization accuracy requirements, if downlink synchronization If there are multiple time slots, the multiple downlink synchronization time slots are distributed and set at equal time intervals. 5. The wireless communication method based on time division duplexing according to claim 4, characterized in that: the allocation of uplink control time slots for transmitting uplink signaling in step (2) is to allocate more than one uplink control time slots , the uplink control time slot part is used to transmit low-speed data services. 6. The wireless communication method based on time division duplexing according to claim 5, characterized in that: the allocation of downlink control time slots for transmitting downlink signaling in step (3) is to allocate more than one downlink control time slots , the downlink control time slot part is used to transmit low-speed data services. 7. The wireless communication method based on time division duplexing according to claim 6, characterized in that: the time length of the plurality of downlink service time slots in step (3) is based on the distribution of the highest data transmission rate that the user can achieve or Provided business allocation, the above-mentioned allocated business is the agreed service quality or business type. 8. The wireless communication method based on time-division duplexing according to claim 7, characterized in that the method further comprises: in the full time slot of each downlink service time slot, transmitting using a fixed spreading code for spreading The channel estimation is realized by the pilot signal of high frequency. 9. The wireless communication method based on time division duplexing according to claim 8, characterized in that the channel estimation is realized by allocating a fixed spreading code in the entire time slot to transmit pilot signals. 10. The wireless communication method based on time division duplexing according to claim 7, characterized in that the method further comprises: transmitting pilot signals that are independent from the transmission of downlink service time slots between different downlink service time slots channel estimation. 11. The wireless communication method based on time division duplexing according to claim 9, characterized in that: said transmitting pilot signal is a pilot signal using a fixed symbol for transmission. 12. The wireless communication method based on time division duplexing according to claim 9, characterized in that: said transmitting pilot signal is transmitting a pilot signal using an agreed symbol sequence. 13. The wireless communication method based on time division duplexing according to claim 10, 11, or 12, characterized in that in step (3), an uplink time slot is allocated between the downlink control time slot and the downlink business time slot , wherein the uplink transmission time slots are allocated according to the principle of allocating the shortest possible time period on the basis of meeting the basic conditions for downlink signaling reception; the basic conditions for downlink signaling reception include that the receiving device can obtain a high-speed data transmission process in time Transmission format information. 14. The wireless communication method based on time division duplexing according to claim 13, characterized in that in step (3), an uplink time slot is allocated between the downlink control time slot and the downlink business time slot, and a time length is assigned to An uplink time slot that takes the shortest time required for all user equipments to realize a transmission parameter or a transmission parameter set estimation. 15. The wireless communication method based on time division duplexing according to claim 13, characterized in that in step (3), an uplink time slot is allocated between the downlink control time slot and the downlink business time slot, and a time length is allocated A transmission parameter or a transmission parameter set estimation and an uplink time slot of the shortest time required to complete uplink signaling transmission are realized for all user equipments. 16. The wireless communication method based on time division duplexing according to claim 13, characterized in that in step (3), an uplink time slot is allocated between the downlink control time slot and the downlink business time slot, and a time length is allocated Realize the estimation of a transmission parameter or a transmission parameter set for all user equipments, and complete the uplink signaling transmission and the shortest uplink time slot required for completing the uplink service transmission.

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