WO2010075656A1 - Procédé et dispositif de communication utilisés dans un système multibande de duplexage par répartition dans le temps - Google Patents

Procédé et dispositif de communication utilisés dans un système multibande de duplexage par répartition dans le temps Download PDF

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Publication number
WO2010075656A1
WO2010075656A1 PCT/CN2009/000007 CN2009000007W WO2010075656A1 WO 2010075656 A1 WO2010075656 A1 WO 2010075656A1 CN 2009000007 W CN2009000007 W CN 2009000007W WO 2010075656 A1 WO2010075656 A1 WO 2010075656A1
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WO
WIPO (PCT)
Prior art keywords
communication
frequency
time slot
time
downlink
Prior art date
Application number
PCT/CN2009/000007
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English (en)
Chinese (zh)
Inventor
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 (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to CN200980150619.8A priority Critical patent/CN102246442B/zh
Priority to PCT/CN2009/000007 priority patent/WO2010075656A1/fr
Publication of WO2010075656A1 publication Critical patent/WO2010075656A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2615—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid frequency-time division multiple access [FDMA-TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates to wireless communications, and more particularly to multi-band time division duplex systems in wireless communications. Background technique
  • 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).
  • 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.
  • 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)
  • 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)
  • 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.
  • 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
  • TMG Transmit/Receive Transition Gap
  • 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:
  • 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. .
  • 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.
  • the mobile terminal 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)
  • channel state information Channel Status Information, measured for the downlink time slot
  • the mobile terminal 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.
  • the mobile terminal 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.
  • 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.
  • a method for communicating with a subordinate communication device in a superior communication device 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.
  • 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
  • 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.
  • 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 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
  • the second communication mode is downlink communication
  • 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
  • the allocated time slot is the first frequency and/or the second frequency
  • 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.
  • 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.
  • 1 is a time slot distribution scheme of a conventional multi-band time division duplex communication system
  • FIG. 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
  • 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
  • FIG. 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.
  • 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.
  • the above-mentioned communication device is the base station BS
  • 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.
  • 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.
  • 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.
  • the mobile terminal also has the function of determining and allocating time slots.
  • 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.
  • 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.
  • the carrier frequency is over the entire data frame; ', , , : , , , ,
  • the base station BS 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.
  • 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
  • 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.
  • 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.
  • SAI Slot Arrangement Index
  • 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:
  • 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.
  • 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:
  • 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.
  • the base station 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.
  • 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 base station can allocate the same data frame and multiple carriers due to the large amount of data of these services.
  • 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.
  • 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
  • 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.
  • the carrier frequency of both uplink time slots can be used to ensure the continuity of the downlink communication. .
  • 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.
  • FIG. 3 shows the prior art, as shown in FIG.
  • 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.
  • uplink time slots UL-1 and UL-2 on the carrier frequency
  • uplink time slots UL-1 and UL-2 on carrier frequency / 2
  • uplink time slot UL-1 on the carrier frequency UL-2.
  • UL-1 and UL-2 and so on. Feedback on communication related information
  • 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.
  • the communication related information of a downlink time slot DL-i includes any one or more of the following information:
  • 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.
  • the frame structure shown in FIG. 3 is shown in three parts.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the feedback delay of the communication related information of the downlink time slot can be further reduced.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • two sets of transmitting lines and one set of receiving lines may share a transmitting and receiving antenna.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the base station BS 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.
  • 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
  • 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.
  • 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.
  • SAI Slot Arrangement Index
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • Downlink slots DL-1 and DL-2 are consecutive time slots DL-3 and DL-4 in time and so on.
  • 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.
  • the traffic to be sent to the base station BS at the mobile terminal MS requires 4 uplink time slots to be transmitted.
  • the distribution device 101 allocates the uplink time slot UL-1 of the data frame on the carrier frequency/ 2 .
  • the mobile terminal MS In the prior art, as shown in FIG.
  • 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.
  • 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
  • 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.
  • the communication related information of a downlink time slot DL-i includes any one or more of the following information:
  • 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.
  • the frame structure shown in FIG. 3 is shown in three parts.
  • the previous frame of the data frame is in the downlink time slot DL-5 and DL-6 of the carrier frequency / 2
  • the data frame is in the downlink time slot DL-1 and DL-2 of the carrier frequency / ⁇
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de communication utilisés dans un système multibande de duplexage par répartition dans le temps (TDD) pour résoudre le problème de retard dans l'actuel système multibande TDD. Un dispositif supérieur détermine les intervalles de temps pendant lesquels le temps est réparti sans chevauchement dans la première fréquence et la seconde fréquence, comme étant le premier mode de communication, et détermine d'autres intervalles de temps de la première fréquence et de la seconde fréquence comme étant le second mode de communication. Ensuite, le dispositif supérieur alloue les intervalles de temps correspondants de la première fréquence et/ou de la seconde fréquence au dispositif de communication inférieur sur la base du mode de communication déterminé des intervalles de temps dans la première fréquence et la seconde fréquence.
PCT/CN2009/000007 2009-01-05 2009-01-05 Procédé et dispositif de communication utilisés dans un système multibande de duplexage par répartition dans le temps WO2010075656A1 (fr)

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CN200980150619.8A CN102246442B (zh) 2009-01-05 2009-01-05 用于多带时分双工系统的通信方法及装置
PCT/CN2009/000007 WO2010075656A1 (fr) 2009-01-05 2009-01-05 Procédé et dispositif de communication utilisés dans un système multibande de duplexage par répartition dans le temps

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JP2021528900A (ja) * 2018-06-19 2021-10-21 テレフオンアクチーボラゲット エルエム エリクソン（パブル） 非同期ｔｄｄマルチ帯域動作のための無線ユニット

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