CN1568040A - Implementing method of multicarrier sending-receiving service for time division duplexing mode mobile communication system - Google Patents

Abstract

The invention discloses a method for realizing multi-carrier receiving and dispatching services in a time-division duplex mode mobile communication system. The time slot structure uses the base station to transmit and receive services, and this method realizes the smooth transition from single carrier to multi-carrier, and uses a single-antenna combination structure, so that the cost of multi-carrier transceiver services is not too high.

Description

Method for Realizing Multi-Carrier Transceiver Service in Time Division Duplex Mode Mobile Communication System

technical field

The invention relates to the technical field of wireless mobile communication wireless access, more precisely, it relates to a method for realizing multi-carrier transceiving services in a time-division duplex mode mobile communication system.

Background technique

With the development of communication networks, people are no longer satisfied with accessing the communication network through computers, but hope to be able to connect to the communication network at any place to handle various services, such as receiving and sending emails, web browsing and file Downloading and other services, therefore, the third generation communication network (3G) has developed.

In the mobile communication system of time division duplex (TDD) mode, the receiving and sending services are in different time slots of the same frequency channel, and the separate time is used to receive and transmit channels respectively. The characteristics of the TDD system are: no paired frequencies are required, and the Using various frequency resources, it is suitable for asymmetric uplink and downlink data transmission frequencies; the spectrum utilization rate is high, and the correlation between uplink and downlink resources is large; when performing cell switching, hard switching is adopted.

Take Time Division Multiplexing-Synchronous Code Division Multiple Access (TD-SCDMA) as an example to illustrate the TDD mode communication system. In the TD-SCDMA system, frames are used to transmit data. The frames of the TD-SCDMA system use a time interval of 10ms. A frame can be divided into two 5ms subframes. As shown in Figure 1, Figure 1 is a time slot structure diagram of a subframe, which is specifically described as:

The chip rate of a subframe in the TD-SCDMA system is 1.28Mchip/s, and a subframe contains 6400 chips in total. Each subframe is divided into 7 time slots: TS0, TS1, ... TS6, and three special time slots: DwPTS, GP and UpPTS, these three special time slots are used to ensure the synchronization of the TD-SCDMA system. These three special time slots have a total of 352 chips, of which DwPTS has 96 chips and is the lower synchronization domain; GP has 96 chips and is the isolation domain; UpPTS has 160 chips and is the upper synchronization domain. The 7 time slots of TS0~TS6 are data domain time slots, and each time slot has 864 chips. Among them, TS0 is forcibly allocated as a downlink time slot, TS1 is forcibly allocated as an uplink time slot, and TS2~TS6 can be allocated arbitrarily It is an uplink or downlink time slot, but there can only be two switching points (SwitchingPoint) in one subframe.

As shown in Figure 2, Figure 2 is a subframe time slot structure diagram of symmetrically allocated time slots. This time slot structure is mostly used in voice service-based transceiver services, and its specific description is: when TS2 and TS3 are set to uplink TS4, TS5 and TS6 are set as downlink time slots.

As shown in Figure 3, Figure 3 is a subframe time slot structure diagram with asymmetrically allocated time slots. This type of time slot structure is mostly used in data service-based sending and receiving services, and its specific description is: TS2, TS3 and TS4 Set as uplink time slot, TS5 and TS6 as downlink time slot.

The single-carrier base station uses a single-antenna transceiver combination circuit to perform transmission and reception services. The transmission and reception combination circuit has a transmission and reception combination switch. uplink and downlink business.

However, with the increase of base station users and capacity, the TD-SCDMA single-carrier base station can no longer meet the needs, and the single-carrier base station needs to be expanded into a multi-carrier base station to meet the growing needs of TD-SCDMA. In the prior art, if multi-carrier transceiving services with different time slot structures are to be implemented on the base station, as shown in Figure 4, multiple smart antennas can only be used to implement multi-carrier transceiving services. In the figure, m represents The number of smart antennas, the number of smart antennas is equal to the number of multi-carriers, wherein, in the transceiver structure: the smart antenna (Antenna) is a common antenna for sending and receiving, the filter (Filter) is a radio frequency filter, and the switch control ( Controller) controls the transceiver combining switch (Switch) according to the transmitting and receiving time slots in the carrier time slot structure. Function, the power amplifier (PA) completes the function of amplifying the transmitted signal, the radio frequency signal received by TD-SCDMA is amplified by the low noise amplifier, and sent to the transceiver (TRX), and the TD-SCDMA transmit signal is output from the transceiver Into the power amplifier, after being amplified, it is radiated to the space by the smart antenna. Although the multi-antenna transmission and reception combination structure shown in Figure 4 can realize multi-carrier transmission and reception services, this method cannot achieve a smooth transition from single carrier to multi-carrier, and due to the increase in the number of smart antennas, the cost is extremely high. Not suitable for promotional use.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for realizing multi-carrier transceiving services in a time division duplex mode mobile communication system, so as to use a single-antenna combining structure to perform multi-carrier transceiving services.

The present invention is a method for realizing multi-carrier transceiving services in a time division duplex mode mobile communication system, characterized in that the method comprises:

A fixed time slot structure is selected according to service requirements, and all carriers in the multi-carrier transmit and receive services through the base station according to the fixed time slot structure.

Wherein, the sending and receiving service through the base station includes:

Use the single-antenna transceiver combination in the base station to perform transceiver services.

Wherein, when the service is mainly voice service, the fixed time slot structure is a symmetrical time slot structure for uplink and downlink.

Wherein, when the service is mainly a data service, the fixed time slot structure is an asymmetrical time slot structure for uplink and downlink.

Wherein, the system is a time division synchronous code division multiple access system.

It can be seen that the present invention sets the time slot structure of all the carriers in the multi-carrier to a fixed time slot structure, through this setting, the multi-carrier can transmit and receive services in the single-antenna combining structure without unavoidable Interference, using this method to achieve a smooth transition from single carrier to multi-carrier, and using a single-antenna combination structure, so that the cost of multi-carrier transceiver services is not too high.

Description of drawings

FIG. 1 is a schematic diagram of a time slot structure of a TD-SCDMA subframe.

Fig. 2 is a schematic diagram of a symmetrical time slot structure of a TD-SCDMA subframe.

Fig. 3 is a schematic diagram of an asymmetric time slot structure of a TD-SCDMA subframe.

Figure 4 is a block diagram of TD-SCDMA multi-carrier multi-antenna structure.

Fig. 5 is a structural block diagram of TD-SCDMA multi-carrier single-antenna transceiver combination.

Detailed ways

The present invention is a method for a time-division duplex mode mobile communication system to realize multi-carrier transceiving services. The present invention will be described in detail below in conjunction with the accompanying drawings.

In the embodiment of the present invention, when TD-SCDMA Node B is a single-carrier base station, its single-carrier frequency is F1, and the time slot structure in F1 is set according to network planning and service requirements; In the case of a voice service, the time slot structure of the single carrier is set to the uplink and downlink symmetric structure shown in Figure 2; the time slot structure of the single carrier can also be set as an example to the up and down asymmetric structure shown in Figure 3, The asymmetric structure can be that the uplink is more than the downlink as shown in Figure 3, or that the downlink is more than the uplink. These asymmetric time slot structures for uplink and downlink are mainly used when the service is a data service; or, according to the service The dynamic change of the time slot structure changes the position of the conversion point in real time, so as to meet the needs of the business with different time slot structures; The time slot structure of F1 is set as the symmetrical structure shown in FIG. 2; in other embodiments of the present invention, the time slot structure of a single carrier can be selected as other structures as required, which does not affect the realization of the present invention.

In the embodiment of the present invention, due to the needs of business development, the TD-SCDMA Node B single-carrier base station will be extended to a multi-carrier base station to perform multi-carrier transceiving services. In order to reduce the cost and achieve a smooth transition from single carrier to multi-carrier, the multi-carrier single-antenna transceiver structure shown in Figure 5 is used for transceiver services. This transceiver structure uses a shared Antenna and TRX. Quantity Set the corresponding number of LNAs and PAs in the combiner structure. The Controller 501 controls the Switch according to the sending and receiving time slots in the carrier time slot structure, and the sending and receiving services are combined through the Switch.

Assume that after the single-carrier base station is extended to a multi-carrier base station, the multi-carrier frequencies it transmits and receives are f1, f2...fn, and the time slot structure corresponding to the frequency f1, f2...fn is Slotconfig1, Slotconfig2...Slotconfign, Wherein n≥2; according to the TD-SCDMA protocol, the time slot structure of Slotconfig1, Slotconfig2...Slotconfign can be different, as long as it conforms to the time slot structure of the TD-SCDMA physical layer; in the present embodiment, the time slot of carrier f1 Structure Slotconfig1 adopts the time slot structure shown in accompanying drawing 2, and the time slot structure Slotconfigm of carrier fm adopts the time slot structure shown in accompanying drawing 3, and this time slot structure is different from Slotconfig1 (1＜m≤n), then because Slotconfig1 The Slot5 time slot in the slot structure is a downlink time slot, and the Slot5 time slot in the Slotconfigm time slot structure is an uplink time slot, and the Switch 501 in the multi-carrier transceiver combination structure shown in Figure 5 is based on the time slot structure. Switching control, therefore, in this case, the sending and receiving service cannot be realized by using the sending and receiving combination structure shown in FIG. 5 . In addition, assuming that f1 and fm have different time slot structures, they can still be combined to transmit and receive on the same antenna. From the above analysis, we can know that there must be a time slot, which is an uplink time slot on f1. And it is a downlink time slot on fm, or a downlink time slot on f1, and an uplink time slot on fm. In this case, since the same time slot of f1 and fm carry out different uplink and downlink services respectively, f1 There is serious interference between uplink and downlink between fm and fm; and, since f1 and fm can be any frequency, it may appear that f1 and fm are adjacent frequency points, therefore, it is impossible to use filters at all Interference is suppressed.

According to the above analysis, the following describes the method of using the Node B base station to realize the transceiving service in the case of multi-carrier for different types of the Node B base station transceiver service:

1. Multi-carrier transceiver services are mainly voice services:

Since the transceiving service of the multi-carrier is mainly voice service, and the uplink and downlink symmetrical time slot structure meets the needs of the voice service, the uplink and downlink symmetrical time slot structure is set as the fixed time slot structure of the multi-carrier base station. Since carriers of different frequencies in the multi-carrier may have different uplink and downlink in the same time slot position, the combiner switch cannot be controlled according to the time slot structure and cause unavoidable interference between the uplink and downlink. Therefore, the multi-carrier Each frequency carrier of the multi-carrier base station is set as the fixed time slot structure of the multi-carrier base station. In the embodiment of the present invention, the time slot structures of all the carriers in the multi-carrier adopt a symmetrical uplink and downlink structure. According to this setting, multiple The carrier adopts the single-antenna combining structure shown in Figure 5 for transceiving services; since the single-antenna combining structure shown in Figure 5 can be used for both multi-carrier transmitting and receiving services and single-carrier transmitting and receiving services, it can Realize the smooth transition from single carrier to multi-carrier; in addition, since this combination structure only needs to use one smart antenna, it will not cause an increase in cost;

2. Multi-carrier transceiver services are mainly data services:

Since the transceiver service of this multi-carrier is mainly data service, the uplink and downlink symmetrical structure set when the base station is a single carrier base station no longer meets the needs of the transceiver service. The fixed time slot structure can be the time slot structure with more uplink than downlink as shown in Figure 3, or the time slot structure with more downlink than uplink, or other asymmetric uplink and downlink that meet the needs of data services structure, in the embodiment of the present invention, the time slot structure in which the uplink is more than the downlink shown in FIG. 3 is used as the fixed time slot structure of the Node B base station. Similarly, in order to avoid the possibility that different frequency carriers may have different uplink and downlink in the same time slot position, so that the combiner switch cannot be controlled according to the time slot structure and cause unavoidable interference between uplink and downlink, the multi-carrier Each frequency carrier adopts the fixed time slot structure of the multi-carrier base station. In the embodiment of the present invention, the time slot structure of all carriers in the multi-carrier is set to the uplink and downlink asymmetrical time slot structure shown in FIG. 3 , according to this setting, the multi-carrier adopts the single-antenna combination structure shown in Figure 5 to transmit and receive services.

For other types of transceiving services, the time slot structure can be selected as the fixed time slot structure of the base station according to the needs of the service, and the time slot structure of each frequency carrier in the multi-carrier is set as the fixed time slot structure of the base station. Then, use the single-antenna combining structure shown in Figure 5 to perform multi-carrier transceiving services, thereby achieving a smooth transition from single-carrier to multi-carrier, and avoiding the increase in cost when the single-carrier base station is extended to a multi-carrier base station.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (5)

1, a kind of time division duplex mode mobile communication system realizes the method for multi-carrier transceiving service, it is characterized in that, this method comprises: A fixed time slot structure is selected according to service requirements, and all carriers in the multi-carrier transmit and receive services through the base station according to the fixed time slot structure. 2. The method according to claim 1, wherein the sending and receiving service through the base station comprises: Use the single-antenna transceiver combination in the base station to perform transceiver services. 3. The method according to claim 1, characterized in that, when the service is mainly voice service, the fixed time slot structure is a symmetrical time slot structure for uplink and downlink. 4. The method according to claim 1, wherein when the service is mainly data service, the fixed time slot structure is an asymmetrical time slot structure for uplink and downlink. 5. The method according to claim 1, characterized in that said system is a Time Division Synchronous Code Division Multiple Access system.

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