WO2010075656A1

WO2010075656A1 - Communication method and device used in multi-band time division duplex system

Info

Publication number: WO2010075656A1
Application number: PCT/CN2009/000007
Authority: WO
Inventors: 李栋; 杨红卫
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2009-01-05
Filing date: 2009-01-05
Publication date: 2010-07-08
Also published as: CN102246442A; CN102246442B

Abstract

Disclosed are a communication method and device for use in multi-band Time Division Duplex (TDD) systems, which resolve the delay problem in current such multi-band systems. An upper-level device determines those timeslots distributed in the first frequency and the second frequency in which time is not overlapping as the first communication mode, and determines other timeslots of the first frequency and the second frequency as the second communication mode. The upper-level device then allocates the timeslots of the first frequency and/or the second frequency which mutually correspond to a lower-level communication device, based on the determined communication mode for timeslots in the first frequency and the second frequency.

Description

For multi-band time division duplex systems

Communication method and device

The present invention relates to wireless communications, and more particularly to multi-band time division duplex systems in wireless communications. Background technique

Nowadays, multi-band transmission technology has gained more and more attention in academia and industry due to its obvious advantages in utilizing distributed spectrum resources and providing high data transmission rates. Therefore, multi-band transmission has a good application prospect in standards such as IEEE 802.16m and 3GPP LTE Advanced (3rd Generation Partnership Project Long Term Evolution Advanced). On the other hand, in contrast to multi-band transmission, Time Division Duplex (TDD) technology has good support for unbalanced uplink and downlink services and application for unpaired spectrum allocation. Sex, it also has a strong appeal in the industry. Combining multi-band transmission and TDD technologies, multi-band time division duplex systems are a promising solution for future broadband mobile communication systems.

In the TDD mode, downlink (referred to as DL, generally referred to as a base station or a relay station transmitted to a mobile terminal, or a base station transmitted to a relay station), a time slot (or a subframe) and an uplink (uplink, referred to as a UL, generally referred to as a mobile terminal transmission To the base station or relay station, or the relay station transmits to the base station) The time slots are alternately set in the time domain. In the current multi-band transmission solution in the time division duplex mode, the uplink time slot is set in the same time domain in each of the plurality of carrier frequencies in the same time, and the downlink time slot is also the same. As shown in FIG. 1: wherein the multi-band system includes a dispersed spectrum, and the center carrier frequencies of the spectrum are respectively recorded as Λ, k=l'2, 〜, K. In the current solution, the uplink time slots (dark color blocks) of the data frame on the spectrum are exactly the same in the spectrum, that is, in the frequency spectrum, while the downlink time slots (no color blocks) are in The distributions in the K spectrums, that is, in the K spectrums, are also identical, that is, the uplink time slots of the respective carrier frequencies are completely aligned, and the downlink time slots of the respective carrier frequencies are also completely aligned, which means It is said that the downlink transmission is performed simultaneously in the same time period of the multiple carrier frequencies, and the uplink transmission is also performed simultaneously in the same time period of the multiple carrier frequencies (wherein, when the downlink time slot is switched to the _h line time slot, the data frame is left The Transmit/Receive Transition Gap (TTG) is shown in the lower right slash. When the uplink time slot is switched to the downlink time slot, the data frame also has the receiving/transmitting as indicated by the lower left slash. Receive/transmit Transition Gap (RTG). Summary of the invention

The inventors of the present invention have appreciated that for all carrier frequencies as a whole, the upstream time slots in the data frame are discontinuous in time, as are the downstream time slots. Therefore, the uplink transmission and the downlink transmission cannot be continuously performed in time. This discontinuity of the uplink and downlink transmissions results in a certain Duplex Delay. Duplex delays can cause the following technical problems in communication:

1) In service communication, uplink or downlink data cannot be used for downlink or uplink time slots. Communication must wait until the downlink or uplink time slot ends, and the device can only proceed after returning to the uplink or downlink time slot, which will cause a certain delay. . For example, as shown by the small square in the vertical line of FIG. 1, the base station needs to transmit downlink data of 8 time slots to the mobile terminal, and then uses the frame to transmit the downlink time slot DL-1 to DL-6 of the carrier frequency. After the first part of the downlink data, the uplink time slots UL-1 and UL-2 of the current frame must be terminated, and after the end of the frame, the downlink time slots DL-1 and DL- of the next frame in the carrier frequency/1 are used. 2 Transmit the remaining portion of the downlink data. It can be seen that the downlink data is affected by the delay of 2 slots. For some delay-sensitive services, such as interactive online games, real-time network video and other large-volume broadband real-time interactive services, these delays will lead to service performance degradation;

2) In the communication of the communication related information of the downlink time slot, for example, signaling such as ACK or NAK of the data packet received in the downlink time slot, channel state information (Channel Status Information, measured for the downlink time slot) In the communication of communication information that can be used for multi-antenna precoding or frequency scheduling, the mobile terminal must wait until the first uplink time slot after the downlink time slot arrives, for example, CSI) or Channel Quanlity Information (CQI). , in order to feed it back to the base station. If the downstream time slot is followed by the first one The line slots are far apart, which will result in a large delay. For example, in FIG. 1, when the mobile terminal needs to feed back the communication information of the downlink time slot DL-1 of the carrier frequency / ₂ to the base station, it can only use the closest to the DL-1 in the current frame. The upstream slot UL-1 of the slot, which produces a delay of about 5 slots. Since the base station generally performs operations such as user scheduling and resource allocation at the beginning of the frame, the communication related information feedback sent at the end of the frame may not be fed back to the base station before the base station schedules, which will cause further delay.

It can be seen that the existing multi-band time division duplex system has relatively low degree of freedom and has a duplex delay problem, which leads to a large delay in communication of communication and communication related information, which is not conducive to the improvement of system performance.

In order to better solve the above technical problems, it is necessary to increase the degree of system freedom, reduce or even avoid the duplex delay of the multi-band time division duplex system. Preferably, delays in communication processes such as traffic transmission and communication information feedback should be reduced or even eliminated.

According to an embodiment of an aspect of the present invention, a method for communicating with a subordinate communication device in a superior communication device is provided, wherein the method includes the following steps: i. distributing at least one first frequency and at least according to a certain rule a time unit in which the time of the second frequency does not overlap or not overlap is determined as the first communication mode, and the first frequency and other time units of the second frequency are determined as the second communication mode; ii. based on the determined The communication manner of the first frequency and the time unit of the second frequency, according to a predetermined rule, assigning a time unit corresponding to the type of the first frequency and/or the second frequency To the subordinate communication device.

According to an embodiment of another aspect of the present invention, there is provided a method for communicating with a superior communication device in a lower level communication device, wherein time is distributed over at least one first frequency and at least one second frequency according to a certain rule The non-overlapping or incompletely overlapping time unit is the first communication mode, and the first frequency and the other time units on the second frequency are the second communication mode, the method includes the following steps: I. acquiring the superior communication a time unit allocated by the device, at the first frequency and/or the second frequency, corresponding to the type of communication; II. communicating with the superior communication device using the time unit.

According to an embodiment of the present invention, there is provided an apparatus for communicating with a lower level communication device in a higher level communication device, comprising: determining means, configured to: Determining, by a certain rule, a time unit that does not overlap or not completely overlap the time of the at least one first frequency and the at least one second frequency as the first communication mode, and the other time of the first frequency and the second frequency Determining, by the second communication mode, a means for communicating, according to the determined communication manner of the first frequency and the time unit of the second frequency, according to a predetermined rule, the first frequency and/or the And a device for communicating with a superior communication device in a lower-level communication device, wherein the second frequency is distributed to the at least one first frequency in accordance with a certain embodiment of the present invention The time unit of the at least one second frequency that does not overlap or not overlap is the first communication mode, and the first frequency and the other time unit on the second frequency are the second communication mode, the device includes: acquiring And means for acquiring, by the upper-level communication device, the type of the communication on the first frequency and/or the second frequency The second communication device is configured to communicate with the superior communication device using the time unit.

Preferably, the communication is based on a data frame, the time unit is a time slot in a data frame, the first communication mode is uplink communication, and the second communication mode is downlink communication, and the time slot of uplink communication is in the The first frequency does not overlap with the time on the second frequency, and is evenly distributed throughout the data frame, and the allocated time slot is the first frequency and/or the second frequency, and the The time slot in the time slot corresponding to the type of communication corresponds to the earlier time slot.

One embodiment of the present invention proposes a new communication method applicable to a multi-band time division duplex system by dispersing uplink or downlink time slots in a plurality of carrier frequencies without overlapping or not completely overlapping in time, thereby reducing duplex The delay increases the freedom of the communication system. The preferred embodiment of the present invention reduces the latency of prior art communications by communicating for uplink or downlink time slots that are allocated earlier in a plurality of carrier frequencies, and preserves the multi-band transmission mode for dispersed spectral resources. Good use, and good support for unbalanced uplink and downlink services with time division duplex mode. Preferably, for delay-sensitive, large-volume service communication, a preferred embodiment of the present invention reduces communication latency and improves service performance; and for communication information feedback, another preferred embodiment of the present invention is capable of Allocation of upstream time slots, down Low feedback delay improves system communication performance. DRAWINGS

Other features, objects, and advantages of the present invention will become more apparent from the detailed description of the accompanying drawings.

1 is a time slot distribution scheme of a conventional multi-band time division duplex communication system;

2 is a flow chart of a method for a base station to communicate with a mobile terminal in accordance with an embodiment of the present invention;

3 is a time slot distribution scheme of a multi-band time division duplex communication system according to an embodiment of the present invention;

4 is a time slot distribution scheme of another multi-band time division duplex communication system according to an embodiment of the present invention;

5 is a scheme for allocating uplink time slots for communication related information of each downlink time slot in a time slot distribution of a multi-band time division duplex communication system according to an embodiment of the present invention;

6 is a block diagram and a working flow diagram of an apparatus for communicating between a base station and a mobile terminal according to an embodiment of the present invention;

Figure 7 is a block diagram of a communication device of a base station in accordance with an embodiment of the present invention; Figure 8 is a diagram showing changes in states of various configurations of a communication device of a base station at different time slots, in accordance with an embodiment of the present invention.

In the figures, the same or similar reference numerals denote the same or similar components. detailed description

Referring now to Figures 2 to 5, the specific embodiment of the present invention is described in terms of a method:

In this embodiment, the method of the present invention is described in detail by using a multi-band time division duplex system using two independent carrier frequencies and / ₂ , and the frequency spacing between the two carrier frequencies is sufficiently large (for example, tens of MHz) to ensure The communication on these two carrier frequencies does not interfere with each other. A pair of carrier frequencies of the existing dual carrier frequency time division duplex system can meet this requirement. Understandably, The present invention is not limited to two carrier frequencies, but can be applied to a multi-band time division duplex system of any number of carrier frequencies, which will be supported by the present description in the following description.

The present invention relates to a device in a wireless communication network that determines the distribution of uplink time slots and downlink time slots in a data frame of a multi-band time division duplex in each carrier frequency, and allocates a suitable time slot for its communication. The device; and the device that receives the time slot distribution determined by the upper-level communication device and communicates with the time-based allocation result of the upper-level communication device is referred to as a lower-level communication device. In this embodiment, the above-mentioned communication device is the base station BS, and the lower-level communication device is the mobile terminal MS as an example to describe the present invention in detail. It can be understood that the present invention is not limited thereto. In the relay network, it may also be applicable to the base station determining the time slot distribution and the allocation time slot for the relay station, and then the lower level communication device is the relay station; the relay station has its jurisdiction. When the determining and assigning rights of the time slot distribution structure of the area are used, the present invention is also applicable to the relay station determining the time slot allocation and allocation time slot for the mobile terminal, and the upper communication device is the relay station. It will also be appreciated that in some special cases, the mobile terminal also has the function of determining and allocating time slots. Those skilled in the art will be able to implement the present invention in these instances directly and without doubt in light of the teachings of the present invention, which is not described herein.

First, as shown in FIG. 2, in step S10, the base station BS determines slots that are not overlapped or not fully overlapped with time of /2 according to a certain rule as uplink time slots, and other time slots of fi and / ₂ Determined as the downlink mode.

Specifically, the distribution result of the uplink and downlink time slots determined by the base station BS in the current data frame and the next data frame at two carrier frequencies is as shown in FIG. 3 (including RTG and TTG), where one data frame includes eight Gap. It can be seen that, unlike the prior art shown in Fig. 1, in the time slot distribution for the multi-band time division duplex system determined by the embodiment of the present invention, the carrier frequency is over the entire data frame; ', , , : , , ,

After determining the distribution manner of the time slots of the data frames in the respective carrier frequencies, preferably, the base station BS provides the determination results to the mobile terminals under its jurisdiction. In this embodiment, the base station sets the carrier frequency/) as the primary carrier frequency, and the primary carrier frequency is responsible for carrying the fully configured control channel, where the channel includes a broadcast channel for transmitting system configuration information and is used for each mobile terminal. a control channel for transmitting resource allocation information (i.e., carrier frequency allocated to each mobile terminal, time slot and subchannel information in the allocated carrier frequency slot), of course, the primary carrier frequency also bears communication of a part of the service and communication related information; The carrier frequency / _{2 is} defined as the slave carrier frequency, which is generally only responsible for the communication of the service and communication related information.

Generally, the system configuration information in the broadcast channel includes carrier frequency configuration information, including the ratio of the number of downlink and uplink time slots of each carrier frequency and the distribution of the downlink and uplink time slots of the determined carrier frequencies. The present invention uses a Slot Arrangement Index (SAI) to represent each carrier frequency. The downlink (DL) and uplink (UL) time slots in the data frame shown in Figure 3 included in the carrier frequency configuration information are as follows:

Table 1

The carrier frequency configuration information is transmitted to each mobile terminal in the first downlink time slot DL-1 of the primary carrier frequency/data frame.

6:2. It can be understood that the present invention is not limited to this ratio, and the ratio of the number of downlink time slots to uplink time slots can be set to 5:3 or 4:4 based on statistics or planning of system communication traffic. The following table is an example of the distribution of the downlink and uplink time slots in the data frame for these two ratios. The table also shows that the ratio of the number of downlink and uplink time slots for the four carrier frequencies is 7. Time slot distribution of 1 and 6:2:

Table 2

DL: UL SAI time slot distribution

0 DDDDDUUU

5:3

1 DUUUDDDD

0 DDDDUUUU

4:4

1 UUUUDDDD

7: 1 0 DDDDDDDU 1 DDDDDUDD

2 DDDUDDDD

3 DUDDDDDD

0 DDDDDDUU

1 DDDDUUDD

6:2

2 DDUUDDDD

3 UUDDDDDD Figure 4 shows a time slot distribution for a ratio of 6:2 of downlink and uplink time slots for four carrier frequencies in accordance with another embodiment of the present invention.

It will be understood by those skilled in the art that the ratio of the number of downlink and uplink time slots of each carrier frequency may also be different. Those skilled in the art should be able to implement the present invention in these scenarios directly and without doubt, in accordance with the teachings of the present invention, which is not described herein.

After determining the downlink and uplink time slot distribution of the data frame in each carrier frequency, before communicating with the mobile terminal, the base station, based on the determined carrier frequency and the time slot distribution of / ₂ , according to a predetermined rule, in step S11 The carrier frequency and/or the time slot corresponding to the communication type is allocated to the mobile terminal that performs communication. Preferably, in order to reduce the communication delay, the predetermined rule is a time slot that allocates a carrier frequency and/or / ₂ that corresponds to the communication type and is earlier (in all available time slots of the carrier frequency /; and). The present invention will be described in detail below by taking feedback of service communication and communication related information as an example. Business communication

When providing downlink communication for delay-sensitive services, such as interactive online games, real-time network video, and other large-capacity broadband real-time interactive services, the base station can allocate the same data frame and multiple carriers due to the large amount of data of these services. A plurality of downlink time slots that are frequency-switched and time-continuous. For example, if the data to be sent to the mobile terminal MS at the base station needs 8 downlink time slots to be transmitted, the base station BS allocates the data frame to the downlink of the carrier frequency as shown by the small vertical line in FIG. Gap DL-1 to DL-6, and (in carrier frequency and / ₂ In the downlink time slot, adjacent to the downlink time slots, preferably in time, the downlink time slots DL-5 and DL-6 of the current data frame at the carrier frequency f ₂ are given to the mobile terminal MS. In the prior art, as shown by the small square in the vertical line of FIG. 1 , the downlink signal of 8 downlink time slots needs to be in the sixth time slot of the data frame and the next data frame in the carrier frequency. Two time slots of /} can be sent. It can be seen that this embodiment of the present invention eliminates the technical problem that the downlink transmission is blocked by the uplink time slot, cannot allocate a continuous large number of time slots, and causes delay, ensures continuous data transmission, and improves system performance.

Of course, if the data is longer, for example, more than 10 time slots are needed for transmission, the base station BS can allocate the data frame in the downlink time slots DL-1 to DL-6 of the carrier frequency, and the data frame is in the carrier frequency / ₂ After the downlink time slots DL-5 and DL-6 and the next data frame are in the downlink time slots DL-1 and DL-2 of the carrier frequency / ₂ , the downlink of the next data frame on the carrier frequency and the carrier frequency can be allocated. The time slots DL-1 and DL-2 are consecutive time slots DL-3 and DL-4 in time and so on. In general, the traffic of the downlink communication and the uplink communication in the wireless communication system is relatively large. Therefore, according to the communication system of this embodiment of the present invention, the carrier frequency of both uplink time slots can be used to ensure the continuity of the downlink communication. .

The following communication is taken as an example. It can be understood that, in terms of service communication, the present invention is equally applicable to a communication scheme that provides low latency and even delays for uplink services with large data volume and delay sensitivity. For example, a service to be sent to the base station BS at the mobile terminal MS needs 4 uplink time slots to be transmitted, and as shown in FIG. 3, the base station BS allocates the uplink time slot UL of the data frame on the carrier frequency. 1 with UL-2, and (in all uplink time slots of carrier frequency /) and / ₂ ), the uplink time slot UL-1 and UL- of the present data frame on the carrier frequency adjacent to the uplink time slot 2 to the mobile terminal MS. In the prior art, as shown in FIG. 1, since there are only two uplink time slots in the data frame time, the uplink signal of 4 time slots must be completely transmitted by the data frame and the next data frame. It can be seen that this embodiment of the invention reduces the latency of upstream communications and improves system performance. It can be understood that, because the uplink and downlink traffic in the system is unbalanced, there are many downlink time slots and fewer uplink time slots. When there are only two carrier frequencies, the uplink time slots that are all allocated in the data frame cannot be consecutive in time. . In the case of a large carrier frequency, as shown in FIG. 4, the base station BS can allocate consecutive eight uplink time slots in the data frame, that is, the uplink of the data frame on the carrier frequency. Time slot UL-1 and UL-2, uplink time slots UL-1 and UL-2 on the carrier frequency, uplink time slots UL-1 and UL-2 on carrier frequency / ₂ , and uplink time slot UL-1 on the carrier frequency UL-2. In the case that more consecutive uplink time slots are needed, it is also possible to continue to allocate the uplink time slots on the carrier frequency of the next frame in which the uplink time slots UL-1 and UL-2 on the carrier frequency are consecutive in time. UL-1 and UL-2 and so on. Feedback on communication related information

In addition to service communication, the present invention is also applicable to a base station BS that allocates uplink time slots to mobile terminals MS to feed back communication related information of downlink time slots. Specifically, the communication related information of a downlink time slot DL-i includes any one or more of the following information:

- reception response information of a downlink service packet received in the downlink time slot DL-i, such as ACK or NACK;

- Wideband and/or narrowband channel state information and/or channel quality information for frequency selective scheduling and/or Adaptive Modulation and Coding (AMC) in the downlink time slot DL-i;

- Channel level information for the downlink time slot DL-i for MIMO transmission level adaptation. Pui 'J, the base station BS carrier frequency or carrier frequency, uplink communication is determined, (in all uplink time slot and carrier frequency fj f ₂ in) the downlink timeslot DL-i in time with the adjacent The uplink time slot is allocated to the mobile terminal MS. Preferably, as shown in FIG. 5, the frame structure shown in FIG. 3 is shown in three parts. In the first part, the former one in that the frame carrier frequency / ₂ and DL-5 downlink time slots DL-6, in that the frame carrier / downlink time slots DL-1 and DL-2, and The data frame is in the downlink time slots DL-1 and DL-2 of the carrier frequency, and the downlink time slots UL-1 and UL-2 of the current data frame are in the carrier frequency carrier. The uplink time slot UL-1 is adjacent to the UL-2 and other uplink time slots. Therefore, the communication related information of the downlink time slot DL-5 and DL-6 of the previous frame in the carrier frequency can be in the current data frame. Is sent in the uplink time slot UL-1 of the carrier frequency / ₂ ; and the data frame is in the downlink time slots DL-1 and DL-2 of the carrier frequency, and the downlink time slots DL-1 and DL- of the carrier frequency / ₂ The communication related information of 2 is issued in the uplink time slot UL-2 of the carrier frequency in this data frame. Similarly, in the second part, the data frame is in the downlink time slot DL-3 to DL-6 of the carrier frequency, and the data frame is in the carrier frequency / ₂ downlink time slot DL-3 and DL-4, etc. Downlink time slot communication related 7 The information may be in the uplink time slot UL of the carrier frequency/; adjacent to this (the next frame is in the carrier frequency / ₂ uplink time slot UL-1 and UL-2 and other uplink time slots) 1 and UL-2, the data frame is in the downlink time slot DL-5 and DL-6 of the carrier frequency / ₂ , the next frame is in the downlink time slot DL-1 and DL-2 of the carrier frequency /} and the next The downlink time slots DL-1 and DL-2 of the frame at the carrier frequency may be issued in the next time slots UL-1 and UL-2 of the carrier frequency in the next frame. It can be seen that the communication related information of the downlink time slot of the mobile terminal MS can be fed back to the base station after being delayed by 4 time slots at the latest; for the prior art, as shown in FIG. 1 , the communication related information of the downlink time slot is latest. It takes 6 time slots to delay feedback. It can be seen that the feedback delay is greatly reduced and the system performance is greatly improved.

In the case of a large carrier frequency, as shown in the four carrier frequencies shown in FIG. 4, the feedback delay of the communication related information of the downlink time slot can be further reduced. Specifically, as shown in FIG. 4, the base station BS in each frame of the present data carrier //, / ₂ with three downlink time slots DL-1 assigned to the communication-related information on the three downlink time slots nearer This data frame is fed back in the uplink time slot UL-1 of the carrier frequency. And the communication related information of the three downlink time slots DL-2 of the carrier frequency, / ₂ , and the data frame are respectively allocated to the carrier frequency of the data frame which is adjacent to the three downlink time slots and is not occupied. The uplink time slot UL-2, for feedback, it can be understood that in the case that the data frame is not occupied by the uplink time slot UL-1 of the carrier frequency, the base station BS can also allocate the uplink time slot UL of the carrier frequency. -1. Then, after the mobile terminal MS is allocated the time slot of the carrier frequency and/or the carrier frequency used for the communication, in step S12, the base station BS controls the channel in the downlink time slot of the primary carrier frequency. The result of the allocation of the slot is sent to the mobile terminal MS.

Next, in step S20, the mobile terminal MS acquires a time slot allocated by the base station BS, carrier frequency/} and/or carrier frequency/ ₂ , which corresponds to the communication and is earlier.

Finally, in step S13 and step S21, the base station BS and the mobile terminal MS perform communication or communication related information feedback and the like based on the allocated time slot. The technical solutions of the method, the device, and the like for the mobile terminal MS to communicate with the base station BS based on the allocated time slots are well known to those skilled in the art, and the description is not described herein. The apparatus for communicating with the mobile terminal MS based on the distributed time slots of the base station BS proposed by the present invention will be described below. Specifically, a block diagram of the communication device is shown in FIG. The apparatus corresponds to the multi-band time division duplex system with two carrier frequencies described in the above embodiments, which communicates based on the time slot distribution as shown in FIG.

According to the time slot distribution shown in FIG. 3, it can be known that the two carrier frequencies can transmit signals at the same time, or can be in the transmitting and receiving states respectively. Therefore, two sets of transmission lines including baseband components, radio frequency components, and the like, and a corresponding set of receiving lines are required. As shown in FIG. 7, after the downlink data corresponding to the two carrier frequencies/} and / ₂ respectively are transmitted by the base station through the IFTT module and the digital-to-analog conversion module D/A, The resulting signals are respectively moved by the spectrum shifting module (ie, the multiplier in the figure) to the two carrier frequencies /} and / ₂ , then the power amplifier PA is used for power amplifier, and finally sent through the antenna. For a receiving line that switches between two carrier frequencies _ } and / ₂ , the wireless signal received by the antenna passes through the low noise amplifier LNA, and then is moved by the spectrum shifting module from the carrier frequency or / ₂ to the baseband, and then passes through the modulus. After the module A/D and the FTT module are converted, they are restored to the upstream data.

Preferably, since the communication device operates at two carrier frequencies, the two sets of transmit lines and one set of receive lines do not all work at the same time, so a set of transmit lines can be reused as a receive line to save cost. For example, the FTT module and the spectrum shifting module of the receiving line can be reused separately from the IFFT module of the transmitting line and the spectrum moving module of the transmitting line. It will be understood that the present invention is not limited to reuse and may not be reused.

At the same time, preferably, two sets of transmitting lines and one set of receiving lines may share a transmitting and receiving antenna. At this time, the downlink RF signals output by the two sets of transmitting lines are added, and then sent by the antenna; the antenna provides the received uplink RF signal to the receiving line. It can be understood that the present invention is not limited to the shared antenna, and the transmitting antenna and the receiving antenna may be separately provided for each line.

In the case where a transceiver antenna is shared above, since the two lines are separately transmitted and received on different carrier frequencies, the entire communication device requires a duplexer for control, as shown in FIG. The duplexer is used to separate the transmitted signals of different carrier frequencies on the same antenna port from the received signals. Preferably, the communication device further includes double-throw switching devices Key1 and Key2, and the control communication device switches between two states of dual carrier frequency simultaneous transmission and dual carrier frequency transmission and reception. Preferably, the communication device further includes a time slot timer for controlling The duplexer, the double-throw switching device, the spectrum shifting module, and the like change state with time slots. Figure 8 shows the variation of the states of the various configurations of the communication device at different time slots. It can be seen that in this data frame, the two transmission lines of the communication device operate in the downlink time slots DL-1 and DL-2 of the carrier frequency / / / ₂ , so the double throw switching devices Key 1 and Key 2 are switched to T The duplexer does not work, and the receiving line does not work. In this data frame, the downlink time slot DL-3 and DL-4 of the carrier frequency/}, that is, the data frame is in the carrier frequency/ ₂ uplink time slot UL- 1 works with UL-2, the transmission line with carrier frequency of /}, and the receiving line works at carrier frequency / ₂ , therefore, the double-throw switching device Keyl and Key2 are switched to the B-speed, the duplexer works, and the duplexer operating frequency / _a downlink slot are provided with DL-5 and DL- f ₂ where the frame with the carrier frequency of the uplink time slots UL-1 and UL-2, i.e., that the frame in this data carrier in / ₂ 6, the carrier frequency of / ₂ transmission line works, while the receiving line works at the carrier frequency /}, therefore, the double-throw switching device Keyl and Key2 switch to the B-speed, the duplexer works, and the operating frequency of the duplexer f _a and f _b are set to.

In the above embodiment, the uplink time slots are all distributed in the entire data frame, because the time of the service generation and the time slot of the downlink time slot requiring information related to the feedback communication are in the data frame from the perspective of probability. It is random, so the uplink time slots are evenly distributed, and when the downlink time slots are also uniformly distributed, the probability of delay in communication of communication with communication-related information and the mathematical expectation of delay are the lowest, so uniform distribution can obtain superior performance. It can be understood that certain rules for determining the distribution are not limited to a uniform distribution. One of ordinary skill in the art can design a suitable system based on the traffic volume of the actual system and the time distribution of the service in the data frame based on the teachings of the present invention. The distribution structure of the uplink and downlink time slots in the data frame, and allocation, are all within the scope of the claims of the present invention. The present invention will not be described herein. The various embodiments of the present invention have been described above in terms of methods, and the present invention will be described below from the perspective of the device:

Similar to the above embodiment, the apparatus of the present invention is still described in detail by using two independent carrier frequencies and f ₂ as a multi-band time division duplex system, and the upper communication device is the base station BS and the lower communication device is the mobile terminal MS. . It will be understood that the invention is not limited thereto.

As shown in FIG. 6, the base station BS includes means for communicating with the mobile terminal MS 10. The device 10 includes a determining device 100, a dispensing device 101. Preferably, the transmitting device 102 and the first communication device 103 are further included. The mobile terminal MS comprises means 20 for communicating with a base station BS, the device 20 comprising an acquisition device 200 and a second communication device 201.

First, as shown in FIG. 6, 100 will to a certain rule base station BS determining means 10 is distributed in / time f ₂ and ₇ does not overlap or incomplete overlapping slot identifying uplink slots and / / with / The other time slots of 2 are determined to be in the downlink mode. The determining apparatus 100 may be a processor in the base station, which invokes a certain rule determining algorithm pre-stored in the memory to perform slot determination.

Specifically, the distribution result of the uplink and downlink time slots determined by the base station BS in the current data frame and the next data frame at two carrier frequencies is as shown in FIG. 3 (including RTG and TTG), where one data frame includes eight Gap. It can be seen that, unlike the prior art shown in Fig. 1, in the time slot distribution for the multi-band time division duplex system determined by the embodiment of the present invention, the carrier frequency is // in the entire data frame.

After determining the distribution pattern of the time slots of the data frames in the respective carrier frequencies, preferably, the base station BS provides the determination results to the mobile terminals under its jurisdiction. In this embodiment, the base station sets the carrier frequency as the primary carrier frequency, and the primary carrier frequency is responsible for carrying the fully configured control channel, where the channel includes a broadcast channel for transmitting system configuration information and is used for sending to each mobile terminal. The control channel of the resource allocation information (that is, the carrier frequency allocated to each mobile terminal, the time slot and the subchannel information in the allocated carrier frequency slot), of course, the primary carrier frequency also bears a part of the communication of communication and communication related information; The carrier frequency is defined as the slave carrier frequency, which is generally only responsible for communication of traffic and communication related information.

Generally, the system configuration information in the broadcast channel includes carrier frequency configuration information, including the ratio of the number of downlink and uplink time slots of each carrier frequency and the determined distribution manner of the downlink and uplink time slots of each carrier frequency. The present invention uses a Slot Arrangement Index (SAI) to represent each carrier frequency. The downlink (DL) and uplink (UL) time slot distributions in the data frame shown in Figure 3 included in the carrier frequency configuration information are as follows: Table 1

The carrier frequency configuration information is transmitted to each mobile terminal in the first downlink time slot DL-1 of the primary carrier frequency of the data frame.

After determining the distribution of the data frames in the downlink and uplink time slots of the respective carrier frequencies, before the communication with the mobile terminal, the distribution device 101 of the device 10 is based on the determined carrier frequency/} and / ₂ time slot distribution, according to a predetermined rule. The time slot corresponding to the communication type of the carrier frequency // and/or / ₂ is allocated to the mobile terminal that performs communication. Preferably, in order to reduce the communication delay, the predetermined rule is a time slot that allocates a carrier frequency and/or that corresponds to the type of communication and that is earlier (in all available time slots of the carrier frequency / / and). The allocating means 101 may be a processor in the base station that invokes a predetermined rule allocation algorithm pre-stored in the memory for time slot allocation. The present invention will be described in detail below by taking feedback of service communication and communication related information as an example. Business communication

When providing downlink communication for delay-sensitive services, such as interactive online games, real-time network video, and the like, a large amount of broadband real-time interactive services, since the amount of data of these services is large, the distribution device 101 can allocate the same data frame, and more A plurality of downlink time slots with carrier frequency switching and time continuous. For example, if the data to be sent to the mobile terminal MS at the base station needs 8 downlink time slots to be transmitted, the distribution device 101 allocates the data frame to the downlink of the carrier frequency as shown by the small vertical line in FIG. The time slots DL-1 to DL-6, and (in all downlink time slots of the carrier frequency // and / ₂ ) are adjacent to the downlink time slots, preferably consecutive in time, and the data frame is carried The downlink time slots DL-5 and DL-6 of the frequency / ₂ are given to the mobile terminal MS. In the prior art, as shown by the small square in the vertical line of FIG. 1, the downlink signal of 8 downlink time slots needs the data frame in the carrier frequency // the sixth time slot and the next data frame in the carrier frequency. Two time slots can be sent. It can be seen that this embodiment of the present invention eliminates the fact that the downlink transmission in the prior art is blocked by the uplink time slot, and a continuous number of time slots cannot be allocated, resulting in a delay. The technical problem ensures continuous transmission of data and improves system performance.

Of course, if the data is longer, for example, more than 10 time slots are needed for transmission, the allocation device 101 can allocate the data frame in the downlink time slots DL-1 to DL-6 of the carrier frequency, and the data frame is in the carrier frequency / ₂ The downlink time slots DL-5 and DL-6, the next data frame after the carrier frequency / ₂ downlink time slots DL-1 and DL-2, can allocate the next data frame on the carrier frequency and the carrier frequency Downlink slots DL-1 and DL-2 are consecutive time slots DL-3 and DL-4 in time and so on. Generally, in the wireless communication system, the traffic of the downlink communication and the uplink communication is relatively large. Therefore, according to the communication system of this embodiment of the present invention, the carrier frequency of the two uplink time slots can be used to ensure the continuity of the downlink communication. Sex.

The following communication is taken as an example. It can be understood that, in terms of service communication, the present invention is equally applicable to a communication scheme that provides low latency or even delays for uplink services with large data volume and delay sensitivity. For example, one The traffic to be sent to the base station BS at the mobile terminal MS requires 4 uplink time slots to be transmitted. As shown in FIG. 3, the distribution device 101 allocates the uplink time slot UL-1 of the data frame on the carrier frequency/ ₂ . uplink time slots UL-1 UL-2, and (carrier frequency) for all uplink slots and the f ₂₎ adjacent to the upstream time slots, and in that the frame carrier / on to the UL-2 The mobile terminal MS. In the prior art, as shown in FIG. 1, since there are only two uplink time slots in the data frame time, the uplink signal of 4 time slots must be from the current data frame and the next data frame. It can be seen that this embodiment of the invention reduces the delay of the uplink communication and improves the system performance. It can be understood that, because the uplink and downlink traffic in the system is unbalanced, there are more downlink time slots and fewer uplink time slots. only When two carrier frequencies are used, the uplink time slots evenly distributed in the data frame cannot be consecutive in time. In the case of a large carrier frequency, when four carrier frequencies are as shown in FIG. 4, the distribution device 101 is in the data frame. A continuous eight uplink time slots can be allocated, that is, uplink time slots UL-1 and UL-2 of the data frame on the carrier frequency / ₄ , and uplink time slots UL-1 and UL-2 on the carrier frequency, Uplink slots UL-1 and UL-2 on the carrier frequency and uplink slots UL-1 and UL-2 on the carrier frequency. In the case where more consecutive uplink time slots are required, the allocation and loading can continue. The uplink time slots UL-1 and UL-2 in the frequency are successively consecutive in the next frame on the carrier frequency, UL-1 and UL-2, and so on. Feedback on communication related information

- Channel level information for the downlink time slot DL-i for MIMO transmission level adaptation. Then, the allocating device 101 determines the carrier frequency/or carrier frequency / ₂ , which is determined to be uplink communication, (in all uplink time slots of the carrier frequency and / ₂ ) and the downlink time slot DL-i are temporally adjacent The near uplink time slot is allocated to the mobile terminal MS. Preferably, as shown in FIG. 5, the frame structure shown in FIG. 3 is shown in three parts. In the first part, the previous frame of the data frame is in the downlink time slot DL-5 and DL-6 of the carrier frequency / ₂ , and the data frame is in the downlink time slot DL-1 and DL-2 of the carrier frequency /}, And the data frame is in the downlink time slot DL-1 and DL-2 of the carrier frequency / _{2 and} the downlink time slots UL-1 and UL-2 of the data frame in the carrier frequency ^ (more than this data frame) The carrier frequency/uplink slot UL-1 is adjacent to the UL-2 and other uplink time slots), therefore, the communication of the previous frame in the carrier frequency/ ₂ downlink time slot DL-5 and DL-6 can be performed. The relevant information is sent in this data frame in the uplink time slot UL-1 of the carrier frequency / ₂ ; and the data frame is in the downlink time slots DL-1 and DL-2 of the carrier frequency, and the downlink time slot of the carrier frequency / ₂ The communication related information of DL-1 and DL-2 is issued in the uplink time slot UL-2 of the carrier frequency f ₂ in this data frame. Similarly, in the second part, the data frame is in the downlink time slot DL-3 to DL-6 of the carrier frequency, and the data frame is in the carrier frequency / ₂ downlink time slot DL-3 and DL-4, etc. communication-related information may be in its downlink slot (carrier frequency than the next frame in the uplink time slot UL-1 and UL-2 and other uplink time slot / ₂₎ adjacent to the carrier frequencies present in the data frames of uplink time The gap is UL-1 and UL-2, the data frame is in the downlink time slot DL-5 and DL-6 of the carrier frequency / ₂ , and the next frame is in the downlink time slot DL-1 and DL-2 of the carrier frequency. One frame in the carrier frequency / ₂ downlink time slots DL-1 and DL-2 can be sent in the next frame in the carrier frequency / ₂ uplink time slots UL-1 and UL-2 Out. It can be seen that the communication related information of the downlink time slot of the mobile terminal MS can be fed back to the base station after being delayed by 4 time slots at the latest; for the prior art, as shown in FIG. 1 , the communication related information of the downlink time slot is latest. It takes 6 time slots to delay feedback. It can be seen that the feedback delay is greatly reduced and the system performance is greatly improved.

In the case of a large carrier frequency, as shown in the four carrier frequencies shown in FIG. 4, the feedback delay of the communication related information of the downlink time slot can be further reduced. Specifically, as shown in FIG. 4, the allocating device 101 can allocate the communication related information of the three downlink time slots DL-1 of the carrier frequency, / ₂ and /, respectively, to the time of the three downlink time slots. The adjacent data frame is fed back in the uplink time slot UL-1 of the carrier frequency. The communication related information of the three downlink time slots DL-2 of the carrier frequency/}, ^ and the data frame may be allocated to the data frame which is adjacent to the three downlink time slots and is not occupied. The uplink time slot UL-2 of the frequency is fed back. It can be understood that, in the case that the data frame is not occupied by the uplink time slot UL-1 of the carrier frequency, the distribution device 101 can also allocate the uplink frequency of the carrier frequency. Gap UL-1.

Then, after the mobile terminal MS is allocated the carrier frequency and/or the carrier frequency / ₂ time slot used for communication, the transmitting device 102 of the device 10 controls the channel in the downlink time slot of the primary carrier frequency. The allocation result of the time slot is transmitted to the mobile terminal MS.

Next, the obtaining device 200 of the device 20 of the mobile terminal MS acquires a time slot on the carrier frequency and/or the carrier frequency, which is allocated by the base station BS, corresponding to the communication and earlier.

Finally, the first communication device 103 of the device 10 of the base station BS and the second communication device 201 of the device 20 of the mobile terminal MS perform communication or communication related information feedback and the like based on the assigned time slot. The scheme of the first communication device 103 of the base station BS proposed by the present invention is similar to that described in the foregoing method embodiment; the technical solution of the method, device and the like for the second communication device 201 of the mobile terminal MS to communicate with the first communication device 103 is Those skilled in the art will be familiar with the description, and the description will not be repeated here. The specific embodiments of the present invention have been described above, and it is understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications and changes within the scope of the appended claims.

Claims

The claims include the following steps:

1. determining, by a certain rule, a time unit that is not overlapped or not completely overlapped by the time of the at least one first frequency and the at least one second frequency as the first communication mode, and the first frequency and the second frequency The other time unit is determined to be the second communication mode;

Ii. based on the determined communication manner of the first frequency and the time unit of the second frequency, according to a predetermined rule, the first frequency and/or the second frequency and the type of communication A corresponding time unit is assigned to the subordinate communication device.

The method according to claim 1, wherein the communication is based on a data frame, the time unit is a time slot in a data frame, the first communication mode is an uplink communication, and the second communication mode is For the downlink communication, the time slot for the uplink communication does not overlap with the time on the first frequency and the second frequency, and is uniformly distributed in the entire data frame, and the predetermined rule is to allocate the first An earlier time slot of the frequency and/or the second frequency of the time slot corresponding to the type of communication.

The method according to claim 2, wherein when the service communication is performed, the predetermined rule is any one or more of the following:

- one or more of the first frequency slots of the first frequency, and one or more of the second frequencies that are temporally adjacent to and communicate with the first time slot a second time slot is allocated to the lower level communication device, and a communication manner of the first time slot and the second time slot corresponds to the service communication; and

- one or more of the second frequency, and one or more of the first frequencies that are temporally adjacent to and communicate with the third time slot The fourth time slot is allocated to the lower level communication device, and the communication manner of the third time slot and the fourth time slot corresponds to the service communication.

4. The method according to claim 3, wherein the service communication comprises downlink service communication and/or uplink service communication.

The method according to claim 2, wherein when the lower-level communication device feeds back to the upper-level communication device one or more downlinks corresponding to the first frequency and/or the second frequency When the communication related information of the slot is used, the predetermined rule is:

- assigning to said one or more upstream time slots of said first frequency or said second frequency determined to be uplink communications temporally adjacent said one or more downlink time slots Subordinate communication device.

The method according to claim 5, wherein the communication related information includes any one or more of the following:

- reception response information of data packets of downlink traffic received in respective downlink time slots; - wideband and/or narrowband channel state information and/or channel quality information in respective downlink time slots;

- Channel level information in the corresponding downlink time slot.

7. The method according to claim 2, wherein the method further comprises the following steps:

Iii. The time slot determined as the downlink communication in the first frequency or the second frequency, and the allocation result of the time slot is provided to the lower level communication device;

Iv. communicating with the lower level communication device according to the allocation result of the time slot.

A method for communicating with a superior communication device in a lower-level communication device, wherein a time unit that is distributed over a certain rule on a time at which the at least one first frequency and the at least one second frequency do not overlap or not overlap is a a communication mode, and the first frequency and other time units on the second frequency are the second communication mode, and the method includes the following steps:

Obtaining, by the upper-level communication device, a time unit corresponding to the type of the communication on the first frequency and/or the second frequency;

II. Communicate with the superior communication device using the time unit.

The method according to claim 8, wherein the communication is based on a data frame, the time unit is a time slot in a data frame, the first communication mode is uplink communication, and the second communication mode is For the downlink communication, the time slot for the uplink communication does not overlap with the time on the first frequency and the second frequency, and is uniformly distributed in the entire data frame. The allocated time slot is a time slot of the first frequency and/or the second frequency that is earlier in the time slot corresponding to the type of communication.

The method according to claim 9, wherein, when performing service communication, the step I is any one or more of the following:

Acquiring one or more of the first frequency slots of the first frequency, and one or more of the second frequencies that are temporally adjacent to and communicate with the first time slot a second time slot, wherein the communication manner of the first time slot and the second time slot corresponds to the service communication

Acquiring one or more third time slots of the second frequency, and one or more of the first frequencies that are temporally adjacent to and communicate with the third time slot The fourth time slot, the communication manner of the third time slot and the fourth time slot corresponds to the service communication.

The method according to claim 10, wherein the service comprises downlink service communication and/or uplink service communication.

12. The method according to claim 9, wherein when the lower level communication device feeds back to the upper level communication device one or more downlinks corresponding to the first frequency and/or the second frequency In the case of communication related information of the slot, the step I is:

Obtaining one or more uplink time slots of the first frequency or the second frequency that are determined to be uplink communications that are temporally adjacent to the one or more downlink time slots.

13. The method according to claim 12, wherein the communication related information comprises any one or more of the following:

- Channel level information in the corresponding downlink time slot.

14. An apparatus for communicating with a lower level communication device in a superior communication device, wherein:

Determining means for determining, as a first communication, a time unit that does not overlap or not completely overlaps the time at which the at least one first frequency and the at least one second frequency are distributed according to a certain rule And determining, by the first frequency and other time units of the second frequency, a second mode of speaking;

a distribution means for communicating the first frequency and/or the second frequency according to a predetermined rule based on the determined communication manner of the first frequency and the time unit of the second frequency A time unit corresponding to the type of communication is allocated to the lower level communication device.

The device according to claim 1, wherein the communication is based on a data frame, the time unit is a time slot in a data frame, the first communication mode is uplink communication, and the second communication mode is For the downlink communication, the time slot for the uplink communication does not overlap with the time on the first frequency and the second frequency, and is evenly distributed in the entire data frame, and the predetermined rule is to allocate the first frequency. And/or a time slot of the second frequency that is earlier in time slot corresponding to the type of communication.

The device according to claim 15, wherein when the service communication is performed, the predetermined rule is any one or more of the following:

17. The apparatus according to claim 16, wherein the service communication comprises downlink traffic communication and/or uplink traffic communication.

18. The apparatus according to claim 15, wherein when the lower level communication device feeds back to the upper level communication device one or more downlinks corresponding to the first frequency and/or the second frequency When the communication related information of the slot is used, the predetermined rule is:

- separating one or more uplink time slots of the first frequency or the second frequency determined to be uplink communications that are temporally adjacent to the one or more downlink time slots The lower level communication device is allocated.

19. The apparatus according to claim 18, wherein the communication related information comprises any one or more of the following:

- Channel level information in the corresponding downlink time slot.

The device according to claim 15, wherein the device further comprises: - transmitting means, configured to determine, as the time slot of downlink communication, in the first frequency or the second frequency, The result of the allocation of the gap is provided to the lower level communication device;

a first communication means for communicating with said lower level communication device in accordance with the assignment result of said time slot.

An apparatus for communicating with a superior communication device in a lower-level communication device, wherein a time unit that is distributed over a certain rule on a time at which the at least one first frequency and the at least one second frequency do not overlap or not overlap is a a communication mode, and the first frequency and the other time units on the second frequency are the second communication mode, the device includes:

a obtaining means, configured to acquire a time unit corresponding to the type of the communication, the first frequency and/or the second frequency allocated by the superior communication device;

a second communication device for communicating with said superior communication device using said time unit.

The device according to claim 21, wherein the communication is based on a data frame, the time unit is a time slot in a data frame, the first communication mode is uplink communication, and the second communication mode is For the downlink communication, the time slot for the uplink communication does not overlap with the time on the first frequency and the second frequency, and is uniformly distributed in the entire data frame, where the allocated time slot is the An earlier time slot of the first frequency and/or the second frequency of the time slot corresponding to the type of communication.

The device according to claim 22, wherein, when performing service communication, the acquiring device is configured to:

Acquiring one or more of the first frequency slots, and the second frequency One or more second time slots in the same manner as the first time slot and in the same manner as the first time slot, the first time slot and the second time slot communicate with the service communication Corresponding; and/or

24. The apparatus according to claim 23, wherein the service comprises downlink service communication and/or uplink service communication.

25. The apparatus according to claim 22, wherein when the lower level communication device feeds back to the upper level communication device one or more downlinks corresponding to the first frequency and/or the second frequency When the communication related information of the slot is used, the obtaining device is used to:

26. The method according to claim 25, wherein the communication related information comprises any one or more of the following:

- wideband and/or narrowband channel state information and/or channel quality information in the corresponding downlink time slot; and

- Channel level information in the corresponding downlink time slot.

A higher-level network device, comprising: means for communicating with a lower-level communication device in a higher-level communication device according to any one of claims 14 to 20.

A subordinate network device, comprising: the device for communicating with a superior communication device in a lower level communication device according to any one of claims 21 to 26.